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1. general description the ssl3250a is a photo flash led driver designed for battery operated mobile devices such as mobile phones and pdas. the boost converter delivers high performance and drives a single or dual, high brightness led at up to 500 ma with over 85 % efficiency. the driver can be programmed to operate in flash, torch or indicator / video-on mode. the small silicon size and the high internal switching frequency of 1.2 mhz minimize the ssl3250a footprint making it very suitable fo r mobile phones where space is limited, and only requiring four external components. dr iving a high power flash led within its safe operating limits was a concern when the ssl3250a was designed, so a time-out function can be programmed via the i 2 c interface, which will preven t overstressing the led. due to the specific requirements of a mobile p hone, the flash current can be rapidly lowered during rf transmit by using op tional external setting resistors. 2. features ? high power single, or dual, led output driving up to 500 ma flash current ? separate indicator led output of 2.5 ma to 20 ma ? output voltage of up to 9.5 v ? wide input voltage range of 2.7 v to 5.5 v ? high efficiency, over 85 % at optimum output current ? switching frequency of 1.2 mhz ? flash, torch, and indicator mode supported ? internally timed flash operation up to 820 ms ? i 2 c-bus, programmable up to 400 khz ? strobe signal to avoid i 2 c latency for flash ? discrete enable signals for stand-alone operation ? optional resistor configurable output currents ? fast response to accommodate ex ternal txmasking functionality ? soft start in torch and flash modes to avoid battery overloading ? integrated protection circuits for enhanced sy stem reliability ? internal time-out function ? overtemperature protection (otp) ? undervoltage lockout (uvlo) ? overvoltage protection (ovp) ? output current protection ? interrupt signaling to system controller ? low device shut-down current, less than 1 a ? sot758-3, thermally enhanced 16 terminal hvqfn package ssl3250a photo flash dua l led driver rev. 05 ? 16 december 2009 product data sheet
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 2 of 26 nxp semiconductors ssl3250a photo flash dual led driver 3. applications ? white led driver for battery powered portable devices ? photo flash led driver for mobile phones and digital cameras 4. ordering information 4.1 ordering options 5. marking table 1. ordering information type number package name description version ssl3250ahn/c1 hvqfn16 plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 3 3 0.85 mm sot758-3 table 2. ordering options type number orderable part number pin 1 indicator location for tape and reel ssl3250ahn/c1 ssl3250ahn/c1,528 pin 1 in quadrant 2. see figure 1 . fig 1. ssl3250ahn/c1,528 with package rotated 90 clockwise with pin 1 in quadrant 2 002aae61 3 pin 1 indicator direction of unreeling
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 3 of 26 nxp semiconductors ssl3250a photo flash dual led driver 6. block diagram fig 2. block diagram v bat internal supply if_sel sda/en1 scl/en2 strb int act i 2 c interface and control linear current sink current feedback up converter 014aaa286 4.7 f ceramic 4.7 f ceramic 2.2 h one or two leds led gnd gnd pgnd pgnd r_ind r_fl r_tr i_ind vin vo lx i sink ssl3250a r1 r2 r3 pgnd pgnd
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 4 of 26 nxp semiconductors ssl3250a photo flash dual led driver 7. pinning information 7.1 pinning 7.2 pin description fig 3. pin configuration (terminal 1 index area is die pad gnd) 014aaa363 1 2 3 4 12 11 10 9 16 15 14 13 strb act vin lx 5 6 7 8 r_ind i_ind vo gnd r_tr r_fl scl/en2 sda/en1 pgnd int if_sel led ssl3250a transparent top view terminal 1 index area table 3. pin description symbol pin type description r_tr 1 analog io setting resistor for torch current r_fl 2 analog io setting resistor for flash current scl / en2 3 i serial clock line (scl) in i 2 c mode / enable 2 in direct enable mode sda / en1 4 i/o serial data line (sdl) in i 2 c mode / enable 1 in direct enable mode r_ind 5 analog io setting resistor for indicator current i_ind 6 analog i indicator led current sink vo 7 analog o output voltage gnd 8 ground ground led 9 analog i feedback of the main led current if_sel 10 i interface select; choose between direct enable control or i 2 c int 11 o interrupt output (open collector) pgnd 12 ground power ground lx 13 analog i inductor connection vin 14 input input voltage act 15 i activate strb 16 i strobe signal to enable flash in i 2 c mode die pad - analog exposed die pad; connect to gnd
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 5 of 26 nxp semiconductors ssl3250a photo flash dual led driver 8. functional description 8.1 introduction the ssl3250a is an asynchronous boost converter intended to drive either a single high power flash led or two high power flash leds in series. the main led current is controlled by the output voltage of the boost converter and the integrated linear current sink. the ssl3250a has two interface modes and five operational modes. the control interface is selected by the interface select pin if_sel. depending on the interface mode selected, the device can either be controlled by an i 2 c interface or by external enable lines. both interface modes control the five operational modes. these operational modes are: ? shut-down mode ? standby mode ? indicator mode ? torch mode ? flash mode the first mode is entered by putting a low le vel on the activate pin (act). this pin is common for both interface modes. the operational modes torch and flash apply to the same main led current source, and the indi cator mode applies to a separate indicator led current source. only when the i 2 c interface mode is enabled, the operational modes indicator, flash and/or torch can be used in parallel. in normal operation, the regulated converter uses pulse width modulation (pwm), so the switching frequency is constant in all modes. in applications where the re quired main led voltage is lower than the applied input voltage, the converter switches to linear mode. the excess voltage difference between the required led voltage and the input voltage is now compensated by increasing the voltage over the current sink and therefore on the led pin. apart from the main led(s), a separate indicator led can be driven from the ssl3250a. this indicator led is driven by a linear curr ent sink circuit that operates independently from the switch mode conv erter for the main led(s). 8.2 interface modes the device is equipped i 2 c mode and direct enable mode interfaces. which interface mode is used, is defined by the level of th e if_sel pin at the start-up of the device (v act low to high). the state of the if_sel pin should be kept static after powering up the device. ta b l e 4 shows the interface possibilities. table 4. interface modes if_sel interface mode relevant controls 0i 2 c mode sda, scl, st rb, act, r_fl, int . 1 direct enable mode en1, en2, act, int , r_tr, r_fl, r_ind, int .
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 6 of 26 nxp semiconductors ssl3250a photo flash dual led driver 8.2.1 using the direct enable control when the direct enable mode is used, the device can be switched to the various operational modes using the act, en1 and en 2 control signals. the definition of these control signals is given in ta b l e 5 . the current in the main led, in torch mode and flash mode and the led current in the indicator led can be independently controlled by the external current setting resistors r_ind, r_tr and r_fl. when no external current setting resistors are used, the pins should pr eferably be connected to vin and the default current levels for each led. the relation between the act and en1, en2 signals is given in figure 4 . all modes can be entered from the standby mode. entering torch mode or indicator mode before entering flash mode is not required. 8.2.2 using the i 2 c control using the i 2 c mode enables additional features and settings as described in the i 2 c register set (see ta b l e 6 ). the i 2 c mode has the same operational modes as described in section 8.2.1 , figure 4 . the flash mode is entered in two steps: 1. set the correct current and timing values in the current control and timing registers. this arms the device for the required flash operation. table 5. enable definition act en2 en1 operational mode led active 0 x x shut-down mode - 1 0 0 standby mode - 1 0 1 indicator mode indicator led 1 1 0 torch mode main led 1 1 1 flash mode main led fig 4. functional description of the ssl3250a standby indicator flash torch indicator en2 en1 shut-down t start(soft) act torch 014aaa294 main led current indicator led current
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 7 of 26 nxp semiconductors ssl3250a photo flash dual led driver 2. trigger the flash mode either by the hard ware strb pin or by the flash_strb bit in the flash strobe register 02h. when the ex ternal strobe pin is not used it should be connected to gnd to prevent false strobing of the main led. the external current setting resistor r_fl can still be used in flash mode but is not required. when the external current setting resistor r_fl is not used, the pin should preferably be connected to vi n, this way a default resistor value of approximately 50 k is assumed. the current setting resistors fo r the indicator led, r_ind and for the torch mode, r_tr have no function in i 2 c mode and the pins should preferably be connected to vin. 8.3 operational modes 8.3.1 shut-down mode the device is in shut-down mode when the activate pin (act) is low. in shut-down mode the internal circuitry of the device is turned off to guarantee a low shut-down current. the n-channel mosfet (nmos) is set to high-impedance. to limit the led current to a minimum leakage, the current sink circuitry for both the main led and the indicator led are switched to high-imped ance. after making the pin act high, the device will start up and is ready to receiv e commands through th e selected interface. 8.3.2 standby mode in standby mode the internal circuitry of the device remains on, but the converter is not switching. the nmos is set to high-impedan ce. to limit the led current to a minimum leakage, the current sink circ uitry for both the main le d and the indicator led are switched to high-impedance. in this mode the device is able to respond to i 2 c communication. 8.3.3 torch mode the torch mode allows the main led to be switched on, without timing limitations, at a lower led current setting. the torch mode current in the main led can be set between 50 ma and 200 ma in both the i 2 c and direct enable control mode. in i 2 c mode, the led current is defined by entering a value between a minimum of 1 and a maximum of 11 in the current control register. in i 2 c mode the external r_tr resistor is ignored. if an external r_fl resist or is connected, this resist or will also scale down the set torch current. see section 8.3.6 . the current in the main led using i 2 c mode is defined using equation 1 . when not using the resistor r_fl, assume a value of 50 k in the equation. entering torch mode is done by writing the required current setting in the current control register. the led will light to the set torch current. switching off the torch mode can be done by writing 0h into the current control register, or by entering flash mode, see section 8.3.4 . (1) when using the direct enable mode, the torch current is defined by an external resistor connected to the r_tr pin. the led current is defined using equation 2 . when not using the current set resistor, the torch current will be set to a default level of 125 ma. the i led 50 k r r _ fl --------------- 35 ma 15 ma register + () =
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 8 of 26 nxp semiconductors ssl3250a photo flash dual led driver default current is equal to connecting an external current set resistor of 50 k . entering torch mode in direct enable mode can be done using the en1 and en2 pins. the led will stay on in torch mode for as long as the enable pins are set to torch mode. (2) when not using an external resistor, the r_tr pin can be left unconnected, but it is preferably connected to vin. never connec t the r_tr pin to gnd since it will cause unnecessary reference currents to flow to gnd. figure 5 illustrates the torch mode cu rrent setting equation for i 2 c, while figure 6 illustrates the torch mode current setting equation for the direct enable mode. fig 5. torch mode led current in i 2 c mode fig 6. torch mode led current in direct enable mode i led 50 k r r _ tr --------------- 125 ma = torch current using i 2 c mode i led (ma) register value 01 9 11 7 5 3 014aaa36 4 0 150 100 50 200 torch current using direct control mode i led (ma) register value (k ) 125 31.3 50 014aaa36 5 0 150 125 100 50 200 250
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 9 of 26 nxp semiconductors ssl3250a photo flash dual led driver 8.3.4 flash mode the flash mode allows the main led to be used at high led current setting. the flash mode current can be set up to 500 ma in both the i 2 c and direct enable mode. in i 2 c mode, the current is defined by entering a value between a minimum of 12 and a maximum of 31 in the current control register. the external resistor r_fl can be used to scale down the set current. this can be used in the application to enable txmasking as described in section 8.3.6 . the current in the main led is defined using equation 3 . when not using the r_fl resistor, assume a resistor value of 50 k in the equation. entering flash mode can be done either by using the strb pin or the flash_strb bit in flash strobe register 02h. the duration of th e flash can be determined by a timer, strb triggering or by a time-out. the flash timing is given by equation 3 and in section 8.4.2 . (3) when using the direct enable mode, the flas h current can be defined by an external resistor connected to the r_fl pin. the current in the main led is defined using equation 4 . when not using the current set resi stor, the flash current will be set to a default level of 500 ma. the default current is equal to connecting an external current set resistor of 50 k . entering flash mode in direct enable mode can be done using the en1 and en2 pins. the led will stay on in flash mode for as long as the en able pins are set to flash mode, but is limited to 820 m s maximum by the time-out timer. (4) when no external current set resistor is used, the r_fl pin can be left unconnected but is preferably connected to vin. never connec t the r_fl pin to gnd as this will cause unnecessary reference currents to flow to gnd. figure 7 illustrates the flash mode cu rrent setting equation for i 2 c, while figure 8 illustrates the flash mode current setting equation for the direct enable mode. fig 7. flash mode led current in i 2 c mode i led 50 k r r _ fl --------------- 35 ma 15 ma register + () = i led 50 k r r _ fl --------------- 500 ma = flash current using i 2 c mode 0 32 24 16 12 28 20 014aaa366 250 215 161 125 110 55 375 500 600 0 i led (ma) register value (k ) 200 100 66 . 7 no resistor
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 10 of 26 nxp semiconductors ssl3250a photo flash dual led driver 8.3.5 timed flash mode the timed operation of the flash m ode can only be used in the i 2 c interface mode. when the flash is used in timed mode (bit 4, to_d ef = 1 in timer control register 01h), the internal timer will switch off the main led after the prepr ogrammed maximum time in the timer control register has expired. the timer starts when the flash mode is ac tivated either by the software strobe (flash_strb bit in register 02h) or by a low to high transition of the hardware strobe (strb pin) signal. in timed mode strobing of the flash is edge sensitive, therefore the flash time is independent of the level of the software or ha rdware strobe signal. the flash time is set according to equation 5 : (5) once the flash time has expire d no interrupt will be generated nor will it be flagged in the status register. a new flash period can be st arted immediately afte r the previous timed flash period has expired. 8.3.6 flash mode during rf transmit although the driver is not e quipped with a separate txmask pin, the device can operate like that to lower the current in the main led in flash mode during an rf transmission in a mobile phone application. an external switch can be connected to the resistor controlling the nominal current value for the flash mode. by lowering the current in the main led, the inductor curr ent and therefor e the current drawn fr om the battery will be lowered. reducing the inductor current has to be fast because the inductor current is reduced within 50 s after changing the nominal current level to a lower setting. at the end of the transmission period, the main led current can be increased again to the nominal current level. a soft start ci rcuit will increase the inductor current with a limited slope as defined by the soft start settings. see section 8.5 . fig 8. flash mode led current in direct enable mode flash current using direct control mode i led (ma) resistor value (k ) 50 125 357 014aaa36 7 200 600 0 70 100 400 300 500 t flash 820 ms register 54.6 ms ? =
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 11 of 26 nxp semiconductors ssl3250a photo flash dual led driver 8.3.7 indicator led the indicator led is connected between the v bat and the dedicated indicator led current input pin. internally a linear current sink c ontrols the indicator led current to reach the required current level. in i 2 c mode, the indicator led current can be set between 2.5 ma and 17.5 ma. the internal 3-bit register sets the actual indicator led according to the formula in equation 6 . the external resistor r_ind is ignored. (6) when using the direct enable mode, the indicator current can be determined by an external resistor r_ind. the in dicator current is defined using equation 7 . it can be set between 2.5 ma and 20 ma. when not using the resistor, the indicato r current will be set to a default level of 10 ma. this current is similar to connecting an external resistor of 50 k . entering flash mode in direct enable mode can be done using the en1 and en2 pins. the led will stay on in flash mode fo r as long as the enable pins are set. (7) if there is no resistor connected to the r_ind pin, it can either be left unconnected or connected to vin. never connect the r_ind pin to gnd since it will cause unnecessary reference currents to flow to gnd. figure 10 illustrates the indicator mode current setting equation for i 2 c, while figure 11 illustrates the indicator mode current se tting equation for th e direct enable mode. fig 9. the inductor current during txmask flash average inductor current t mask t < 50 s 014aaa29 6 i i _ ind register 2.5 ma = i i _ ind 50 k r r _ ind ----------------- - 10 ma =
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 12 of 26 nxp semiconductors ssl3250a photo flash dual led driver 8.4 protection circuits there are several protection circuits integrat ed in the device. these protection circuits protect the device and the application against defects. the ssl3250a has four protection circuits that will inhibit switching of the conver ter, programming the st atus regist er 03h and pulling low the interrupt line. t he interrupt line, which can be co nnected to external logic, signaling an error condition. the external logi c can read the status register to determine which fault caused the interrupt and decide on the proper action to take. when not using the i 2 c mode, the status register cannot be read out but the interrupt lin e still is functional to signal a fault condition. fig 10. indicator led currents in i 2 c mode fig 11. indicator led currents in direct enable mode indicator current using i 2 c mode 0 7 5 3 1 014aaa3 68 0 12.5 7.5 2.5 17.5 i i_ind (ma) registe r value 10.0 indicator current using direct control mode 50 25 165 014aaa3 69 0 12.5 7.5 3.0 2.5 17.5 20.0 22.5 i i_ind (ma) registe r value (k )
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 13 of 26 nxp semiconductors ssl3250a photo flash dual led driver the four protection circuits and their bits in the status register are as follows: ? overvoltage protection ? time-out protection ? overtemperature protection ? output short protection when a protection is triggered, switching of t he ic is inhibited without a soft ramp-down of the current in the main led and also the indicator led will be switched off. to recover from this fault condition in i 2 c mode, write 00h to the current control register (00h) to clear the status register release the int line. after clearing the status register, the current control register can be reloaded and the flash can be retriggered. reloading the other registers is not necessary as they will not lose their value when an interrupt is generated. in direct enable mode the status register is cleared and the int line is released, by making both the en1 and en2 pins lo. 8.4.1 overvoltage protection if the output voltage (v o ) exceeds its limit (v ovp , see ta b l e 9 ), switching of the converter is inhibited. the output voltage will exceed v ovp limit when no leds are connected between pins vo and led. in some cases an overvoltage protection may occur when the led pin is shorted to gnd during th e period a flash is generated. the converter is trying to compensate for th e loss of feedback current by increasing v o . when an overvoltage is encountered, the ovptrig fl ag (bit 0) is set in the status register. 8.4.2 untimed flash mode to avoid overloading of the main led du ring a flash in direct enable mode or i 2 c control mode in untimed flash mode (bit 4, to_def = 0 in timer control register 01h). a time-out timer limits the maximum on time of the flash. in both control modes the flash time-out time is set to a fixed level of 820 ms. when the flash strobe signal is set to low in i 2 c control mode, bit 0 in register 02h is set to 0. when the en1 signal is set to low before the time-out timer has expired in direct enable mode, the time-out timer is reset. when a time-out situation is encountered, the totrig flag (bit 1) is set in the status register. see also section 8.3.5 . 8.4.3 overtemperature protection if the chip temperature exceeds its limit (t otp , see ta b l e 9 ), switching of the converter is inhibited until the temperature drops be low its limit minus a small hysteresis. when an overtemperature situati on is encountered, the ottrig flag (bit 2) is set in the status register.
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 14 of 26 nxp semiconductors ssl3250a photo flash dual led driver 8.4.4 short circuit protection to prevent device and battery overloading, the co nverter is short circuit protected. in case the led pin is shorted to gnd due to an application failure, the switching of the converter is inhibited. typical response times between detection of the led pin shorted to gnd and inhibit switching of the converter is less than 1 ms. the short circuit protection is functional at any time during torch mode and also during the soft start phase of the flash period. the short circuit protection may also be trigger ed when either the inductor or the diode is not connected. also, a shorted diode may trigger the output short protection, if two leds are connected in series between vo and led pins. therefore little or no current will flow through the leds or into the led pin and v led will stay almost at gnd level. when an overvoltage is encountered, the os_p rot flag (bit 3) is set in the status register. remark: if v bat is high and only one white led is connected between vo and led pins, the schottky diode may be irreversibly damaged when the led pin is shorted. this is inherent to the asynchronous boost converter topology. 8.4.5 interrupt line the interrupt pin int is an active low open-drain output allowing for multiple devices to be connected as a wired or, using the same interrupt line to the external control logic. on the interrupt line, only one pull-up resistor is needed in the complete system. 8.4.6 undervoltage lockout as a result of a low battery voltage, the input voltage can drop too low to guarantee normal operation. when the input voltage has dropped below the undervoltage lockout level, the device switches to an undervoltage lockout state stopping all operations of the device. start-up is only possible by crossing the star t-up level again. recovering from this error results in the loss of all regist er settings. this protection does not generate an interrupt on the int line nor is it flagged in the status register 03h. 8.5 soft start to avoid battery overloading when entering the torch mode or the flash mode, the device is equipped with a soft start circuit. this circuit limits the rate of rise of the led current to 4.5 ma/ s until the required led current has been reached. when the device ends flash mode or torch mode, the led current de creases with a controlled slope of 9 ma/ s. whenever a protection is activated, the led current decreases without the controlled slope and drops immediately to zero. 8.6 peak current limit to avoid saturation of the inductor, the device is equipped with a peak current limit function. this circuit limits the peak inductor currents to 2.2 a. no protection is activated. 8.7 i 2 c-bus protocol the i 2 c interface is a 2-wire serial interface developed by nxp semiconductors to communicate between different ics or modules. the two wires are an sda wire and an scl wire. both lines must be connected to a positive supply via a pull-up resistor when
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 15 of 26 nxp semiconductors ssl3250a photo flash dual led driver connected to the output stages of a device. da ta transfer may only be initiated when the bus is not busy. the ssl3250a i 2 c bus characteristic is according to the 400 kbit/s fast-mode i 2 c from the i 2 c-bus specification. remark: for more details on the i 2 c standard, refer to the document um10204, ?i 2 c-bus specification and user manual?, version 0.3, june 2007 , which can be downloaded from the nxp web site (www.nxp.com). the following describes the protocols used by the ssl3250a for the read and write sequences. the read sequence may use a repeated start condition during the sequence to avoid that the bus is released during the communication. the sequences can be used to read or write only one data byte or to read or write a sequence of data bytes. figure 12 shows a write sequence for a single byte write. figure 13 show the read sequence for a single byte. fig 12. single byte i 2 c write sequence fig 13. single byte i 2 c read sequence s slave address w a 014aaa29 2 from master to slave from slave to master sub address n a s = start condition p = stop condition a = acknowledge n = not acknowledged n th register a p s slave address w a 014aaa29 0 from master to slave from slave to master sr slave address r a sub address n a s = start condition p = stop condition a = acknowledge n = not acknowledged sr = start repeat n th register n p
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 16 of 26 nxp semiconductors ssl3250a photo flash dual led driver 8.7.1 addressing each ssl3250a in an i 2 c-bus system is activated by sending a valid address to the device. the address always has to be sent as th e first byte after the start condition in the i 2 c-bus protocol figure 14 . there is one address byte required since 7-bit addresses are used. the last bit of the address byte is the read/write-bit and should always be set according to the required operation. this 7-bit i 2 c address is 0110000b (30h). the 7-bit address plus the r/w bit create an 8-bit write address of 60h and a read address of 61h. the second byte sent to the ssl3250a is the subaddress of a specific register. 8.7.2 data after the subduers have been sent the data byte(s) are sent. the definition of the data byte(s) is given in figure 12 . after each data byte an acknowledge is given and the subduers is automatically incremented to the next subduers. a description of the data that can be programme d in the registers is given in the register map in section 8.7.3 . 8.7.3 register map fig 14. i 2 c slave address 0110 000 r w msb lsb 014aaa28 8 table 6. description of registers legend: * default register value address register bit symbol access value description 00h current control 7 to 3 mai n_level r/w 00000* off (default) 00001 torch mode, see section 8.3.3 00010 torch mode, see section 8.3.3 ..... ..... 01010 torch mode, see section 8.3.3 01011 torch mode, see section 8.3.3 01100 flash mode (armed), see section 8.3.4 01101 flash mode (armed), see section 8.3.4 ..... ..... 11110 flash mode (armed), see section 8.3.4 11111 flash mode (armed), see section 8.3.4 2 to 0 ind_level r/w 000 * off (default) 001 indicator on, 2.5 ma 011 indicator on, 5 ma ..... ..... 111 indicator on, 17.5 ma
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 17 of 26 nxp semiconductors ssl3250a photo flash dual led driver 9. application design-in information 9.1 input capacitor for good input voltage decoupling a low esr ceramic capacitor is highly recommended. a 4.7 f (x5r/x7r) 6.3 v is the minimum recommend ed value. since the input capacitor is supplying the input ripple curr ent, a larger capacitor will improv e transient behavior of the regulator and emi behavior of the power supply. taking the capacitor dc bias and the temperature derating specific ations into account, a 10 f (x5r/x7r) is preferred. although it is increasing the component co unt, a smaller capacitor of 100 nf (x5r/x7r) placed in parallel to the input capa citor will also improve emi behavior. when the circuit is used in other than batter y powered applications an d the input capacitor is located relatively far from the dc buffer capacitors, it is recommended to add a 150 f tantalum or a 470 f electrolytic capacitor in pa rallel near the input capacitor. 9.2 output capacitor the output capacitor supplies the current to the main led, while the inductor is being charged, and it also ensure s loop stability. the minimum capacitance for stable loop operation would be 2.2 f, but taking the capacitor dc bias and the temperature derating specifications into account, a low esr ceramic capacitor of 4.7 f (x5r/x7r) is highly recommended. a higher value of capacitance will improve output current ripple, while 01h timer control 7 to 5 reserved - - - 4 to_def r/w 0 * select time-out limit (default) 1 select timed operation 3 to 0 to r/w 0000 * 820 ms (default) 0001 765 ms ..... ..... 1110 56 ms 1111 1 ms 02h flash strobe 7 to 1 reserved - - - 0 flash_strb r/w 0 * - 1 enable flash 03h status 7 to 4 reserved - - - 3ostrig r 0 * led not shorted to gnd 1 led shorted to gnd 2 otptrig r 0* temperature < maximum temperature 1 temperature > maximum temperature; protection triggered 1totrig r 0 * flash time < time-out 1 flash time > time-out, protection triggered 0 ovptrig r 0 * v o < v ovp 1v o > v ovp , protection triggered table 6. description of registers ?continued legend: * default register value address register bit symbol access value description
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 18 of 26 nxp semiconductors ssl3250a photo flash dual led driver maintaining loop stability. the ssl3250a overvoltage limit on v o is 10.3 v (typ). the rated voltage of the output capacitor should be at least 16 v. for solution size reasons lower value ceramic capacitors could be placed in parallel. 9.3 inductor the device has been designed to operate well with inductance values between 1.5 hand3.3 h, in order to optimize fo r solution size. in a typica l high current dual flash led application a 2.2 h inductance is recommended. the inductors saturation current should be greater than or equal to the inductor peak current limiter cu rrent, which is typical 2.2 a. during normal operation, it is recommended to keep the inductor peak current below this value. the copper losses and magnetic hysteresis losses in the in ductor also contribute to the total system losses. 9.4 rectifier diode selecting a schottky diode with low forward vo ltage drop improves efficiency. although the average current through the diode is equal to the load current and independent on duty cycle for a boost converter topology, it is recommended to select a diode with an average current rating that is significantly higher. the peak current rating of the diode should be greater than the peak current through the inductor. 9.5 pcb layout it is essential to have a good circuit layout to maximize efficiency and minimize emi disturbance. because the circui t topology uses an inductor, it is often appointed as a main source for emi disturbance. but any loop of wire carrying a current is essentially an electromagnet with a field strength that is proportional to the current. therefore careful circuit layout is important, keeping loop area s small and minimizing magnetic flux. due to the way an asynchronous boost converter oper ates, there are two power states. one state is when the internal nmos switch is on an d one when the nmos switch is off. during each state there will be a current loop made by the power components that are conducting. arrange the input capacitor, rectifier diode and output capacitor in such a way around the ssl3250a that during each of the two states the current loop is conducting in the same direction. this prevents phase re versal of the magnetic field and reduces radiated emi. the current loop area should be kept small by placing the power components as close as possible to the ssl3250a. use ground planes to keep loop areas to a minimum. priority should be given to positioning the ou tput capacitor and the rectifier diode as close as possible to the lx and pgnd nodes of the ssl3250a. since large currents will flow from the input capacitor to the inductor and no t into the vin pin of the ssl3250a, it is wise to locate the input capacitor near the inductor. the vin pin should be star connected to the positive pad of the input capacitor. it is recommended to place an extra 100 nf capacitor from vin to gnd di rectly next to the ssl3250a. pgnd and gnd of the ssl3250a should be dire ctly connected to each other preferably by using the die pad area under the ssl3250a . place the ground connection of the output capacitor as close as possible to the pgnd pin of the ssl3250a.
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 19 of 26 nxp semiconductors ssl3250a photo flash dual led driver if the ssl3250a is used in direct enable mode and external resistors are used, place the external resistors near the ssl3250a, to minimize disturbance on the output current. connect the other end of the resistors to a ?c lean? ground, that is ground that is not carrying any large currents. it is preferable to connect all resistor grounds to one trace and connect that trace to the gnd pin of the ssl3250a. the preferred minimum trace width for the high current width is 15 mil per ampere. 10. limiting values [1] tolerant to the specified maximum voltage while operating. do not apply voltages externally; this may cause permanent damage to the device. [2] equivalent to discharging a 200 pf capacitor through a 0.75 h coil and a 10 resistor. [3] equivalent to discharging the device (charged with > 10 m resistor) through a 1 measurement resistor. table 7. limiting values in accordance with the absolute maximum rating system (iec 60134).voltages referenced to gnd. symbol parameter conditions min max unit v i input voltage ? 0.5 +5.5 v v act voltage on pin act ? 0.5 v i v v sda voltage on pin sda ? 0.5 v i v v en1 voltage on pin en1 ? 0.5 v i v v scl voltage on pin scl ? 0.5 v i v v en2 voltage on pin en2 ? 0.5 v i v v strb voltage on pin strb ? 0.5 v i v v if_sel voltage on pin if_sel ? 0.5 v i v v int voltage on pin int ? 0.5 v i v v i_ind voltage on pin i_ind ? 0.5 v i v v led voltage on pin led ? 0.5 v o [1] v v o output voltage ? 0.5 +20 [1] v v lx voltage on pin lx ? 0.5 +20 [1] v v r_ind voltage on pin r_ind ? 0.5 v i v v r_tr voltage on pin r_tr ? 0.5 v i v v r_fl voltage on pin r_fl ? 0.5 v i v v pgnd voltage on pin pgnd ? 0.5 +0.5 v p tot total power dissipation t amb =85 c-1.0w t j junction temperature ? 40 +150 c t amb ambient temperature ? 40 +85 c t stg storage temperature ? 40 +150 c v esd electrostatic discharge voltage class 2 human body model; all pins [2] - 2000 v machine model; all pins [2] - 150 v charged-device model; all pins [3] - 500 v
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 20 of 26 nxp semiconductors ssl3250a photo flash dual led driver 11. thermal characteristics [1] the junction to ambient thermal resistance is dependent on the board layout, pcb material appli cation, and environmental con ditions. 12. characteristics table 8. thermal characteristics symbol parameter conditions typ unit r th(j-a) thermal resistance from junction to ambient based on modeling on a four layer board in free air and five thermal vias under the ic [1] 63 k/w table 9. characteristics v i = 3.0 v to 5.5 v; t amb = ? 40 c to +85 c, unless otherwise specified. symbol parameter conditions min typ [1] max unit general voltage levels v i input voltage on pin vin 3.0 - 5.5 v v i(extnd)(vin) extended input voltage on pin vin [2] 2.75 - 5.5 v v i(uvlo) undervoltage lockout input voltage v i falling 2.55 2.65 2.8 v v hys(uvlo) undervoltage lockout hysteresis voltage v i rising 50 100 150 mv general current levels i sd shutdown current shut-down mode; act = 0 - - 1 a i leak(lx) leakage current on pin lx act = 0 - - 0.5 a i lmtr(im)(lx) peak current limiter current on pin lx inductor peak current limiter - 2.2 2.4 a output voltages on external resistor pins v r_ind voltage on pin r_ind independent of load [3] 1.17 1.22 1.27 v v r_tr voltage on pin r_tr independent of load [3] 1.17 1.22 1.27 v v r_fl voltage on pin r_fl independent of load [3] 1.17 1.22 1.27 v allowed input voltages on external resistor pins v r_ind voltage on pin r_ind [3] 1.4 - v i v v r_tr voltage on pin r_tr [3] 1.4 - v i v v r_fl voltage on pin r_fl [3] 1.4 - v i v external resistors r ext(r_ind) external resistance on pin r_ind if_sel = 1; resistors used [3] [4] [5] 25 - 165 k r ext(r_tr) external resistance on pin r_tr if_sel = 1; resistors used [3] [4] [5] 25 - 200 k r ext(r_fl) external resistance on pin r_fl if_sel = 1 or 0; resistors used [3] [4] [5] 50 - 357 k
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 21 of 26 nxp semiconductors ssl3250a photo flash dual led driver high power led parameters v o output voltage on pin vo [6] --9.5v i led led current if_sel = 0; current control register = 08h; strb = 0 40 50 60 ma if_sel = 0; current control register = 30h; strb = 0 106 125 144 ma if_sel = 0; current control register = c0h; strb = 1 356 395 435 ma if_sel = 0; current control register = f8h; strb = 1 450 500 550 ma default flash current; if_sel = 1; en1 = 1; en2 = 1; r_fl = high [3] 450 500 550 ma default torch current; if_sel = 1; en1 = 0; en2 = 1; r_tr = high [3] 106 125 144 ma i leak(led) leakage current on pin led act = 0; shut-down mode - - 0.5 a v led voltage on pin led boost mode; i led =0.5a [7] -300-mv follower mode [7] 350 - - mv v ovp overvoltage protection voltage 9.8 10.5 11.0 v indicator led parameters i i_ind current on pin i_ind if_sel = 0 (i 2 c) 2.5 - 17.5 ma if_sel = 1 (direct enable) 2.5 - 20 ma default indicator current; if_sel = 1; en1 = 1; en2 = 0; r_ind = high -10-ma i i_ind current variation on pin i_ind - - 15 % i leak(i_ind) leakage current on pin i_ind act = 0; shut-down mode - - 1 a power mosfet r dson drain-source on-state resistance nfet - 200 425 mw timing f sw switching frequency 1.08 1.2 1.32 mhz max maximum duty cycle - - 82 % t start(soft) soft start time act = 0 to act = 1 response time - 160 400 s t to(acc) accuracy of time-out time the absolute value can be set with i 2 c 10 - 10 % table 9. characteristics ?continued v i = 3.0 v to 5.5 v; t amb = ? 40 c to +85 c, unless otherwise specified. symbol parameter conditions min typ [1] max unit
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 22 of 26 nxp semiconductors ssl3250a photo flash dual led driver [1] all typical values are measured at t amb = 25 c and v i = 3.6 v. [2] when operating in an extended input voltage range, the device wi ll be fully functional but has a reduced performance specifi cation on certain parameters. an extended input voltage range is entered when the input voltage is dropping below 3.0 v, assuming the devi ce is not in undervoltage lockout mode. [3] when no external resistor is connected, t he device will apply a default current setting. see section 8.3 for details. corresponding pins should then be connected to high (> 1.4 v) [4] higher resistor values than the maximum are considered as no resistor is connected and therefore result in the default curre nt setting. [5] lower resistor values than the minimum will result in lar ge currents being drawn from the device resulting in bad operation. [6] to accommodate two leds with a spread in v f between 2.7 v and 4.3 v each. [7] only valid in boost mode: typi cally in a dual led configuration. when in linear mode, used in specific cases of single led a pplications, excess voltage will fa ll over the led pin. i 2 c interface v il low-level input voltage - - 0.5 v v ih high-level input voltage 1.2 - vin v v ol low-level output voltage i sink =3ma 0 - 0.4 v f scl scl clock frequency 0 - 400 khz digital levels: en1, en2, strb, act v il low-level input voltage digital 0 - 0.5 v v ih high-level input voltage digital 1.2 - - v digital levels: if_sel pin v il low-level input voltage if_sel pin 0 - 0.5v i v v ih high-level input voltage if_sel pin 0.5v i -v i v digital levels: int v ol low-level output voltage i sink =3ma 0 - 0.4 v i ih high-level input current 0 - 0.5 a temperature t amb ambient temperature ? 40 +25 +85 c t otp overtemperature prot ection trip temperature rising - 150 - c t otp(hys) overtemperature pr otection trip hysteresis temperature falling - 20 - c table 9. characteristics ?continued v i = 3.0 v to 5.5 v; t amb = ? 40 c to +85 c, unless otherwise specified. symbol parameter conditions min typ [1] max unit
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 23 of 26 nxp semiconductors ssl3250a photo flash dual led driver 13. package outline fig 15. package outline sot758-3 (hvqfn16) references outline version european projection issue date iec jedec jeita sot758-3 mo-220 sot758- 3 07-10-11 08-02-08 unit a max mm 0.9 0.05 0.00 0.7 0.6 0.2 3.1 2.9 2.85 2.65 1.6 1.4 2.85 2.65 1.6 1.4 1.5 0.05 0.05 a 1 dimensions (mm are the original dimensions) h vqfn16: plastic thermal enhanced very thin quad flat package; no leads; 1 6 terminals; body 3 x 3 x 0.85 mm 0 2.5 5 mm scale a 4 b 0.30 0.18 c d d 1 d h e 3.1 2.9 e 1 e h e 0.5 e 1 e 2 1.5 l 0.5 0.3 v 0.1 w yy 1 0.1 c y c y 1 x terminal 1 index area b a d 1 d e 1 e detail x a 1 a 4 a c terminal 1 index area b e 2 e 1 e e 1/2 e 1/2 e a c b v m c w m d h e h l 4 58 9 12 13 1 16
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 24 of 26 nxp semiconductors ssl3250a photo flash dual led driver 14. abbreviations 15. revision history table 10. abbreviations abbreviation description emi electromagnet ic interference esr equivalent series resistance ic integrated circuit io input/output led light emitting diode mosfet metal-oxide semiconductor field-effect transistor nmos n-type metal-oxide semiconductor pda personal digital assistants pwm pulse width modulation rf radio frequency table 11. revision history document id release date data sheet status change notice supersedes ssl3250a_5 20091216 product data sheet - ssl3250a_4 modifications: ? equation 1 modified ssl3250a_4 20091104 product data sheet - ssl3250a_3 ssl3250a_3 20090630 product data sheet - ssl3250a_2 ssl3250a_2 20090421 product data sheet - ssl3250a_1 ssl3250a_1 20090205 product data sheet - -
ssl3250a_5 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 05 ? 16 december 2009 25 of 26 nxp semiconductors ssl3250a photo flash dual led driver 16. legal information 16.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 16.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. 16.3 disclaimers general ? information in this document is believed to be accurate and reliable. however, nxp semiconductors d oes not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use ? nxp semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors accepts no liability for inclusion and/or use of nxp semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) may cause permanent damage to the device. limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the characteristics sections of this document is not implied. exposure to limiting values for extended periods may affect device reliability. terms and conditions of sale ? nxp semiconductors products are sold subject to the general terms and condit ions of commercial sale, as published at http://www.nxp.com/profile/terms , including those pertaining to warranty, intellectual property rights infringement and limitation of liability, unless explicitly otherwise agreed to in writ ing by nxp semiconductors. in case of any inconsistency or conflict between information in this document and such terms and conditions, the latter will prevail. no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. export control ? this document as well as the item(s) described herein may be subject to export control regulations. export might require a prior authorization from national authorities. 16.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. i 2 c-bus ? logo is a trademark of nxp b.v. 17. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this docu ment contains the product specification.
nxp semiconductors ssl3250a photo flash dual led driver ? nxp b.v. 2009. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 16 december 2009 document identifier: ssl3250a_5 please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 18. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 ordering information . . . . . . . . . . . . . . . . . . . . . 2 4.1 ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2 5 marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 6 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7 pinning information . . . . . . . . . . . . . . . . . . . . . . 4 7.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 7.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4 8 functional description . . . . . . . . . . . . . . . . . . . 5 8.1 introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8.2 interface modes . . . . . . . . . . . . . . . . . . . . . . . . 5 8.2.1 using the direct enable control . . . . . . . . . . . . . 6 8.2.2 using the i 2 c control. . . . . . . . . . . . . . . . . . . . . 6 8.3 operational modes . . . . . . . . . . . . . . . . . . . . . . 7 8.3.1 shut-down mode . . . . . . . . . . . . . . . . . . . . . . . 7 8.3.2 standby mode. . . . . . . . . . . . . . . . . . . . . . . . . . 7 8.3.3 torch mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8.3.4 flash mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 8.3.5 timed flash mode . . . . . . . . . . . . . . . . . . . . . 10 8.3.6 flash mode during rf transmit . . . . . . . . . . . 10 8.3.7 indicator led . . . . . . . . . . . . . . . . . . . . . . . . . 11 8.4 protection circuits . . . . . . . . . . . . . . . . . . . . . . 12 8.4.1 overvoltage protection . . . . . . . . . . . . . . . . . . 13 8.4.2 untimed flash mode . . . . . . . . . . . . . . . . . . . 13 8.4.3 overtemperature protection . . . . . . . . . . . . . . 13 8.4.4 short circuit protection . . . . . . . . . . . . . . . . . . 14 8.4.5 interrupt line . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8.4.6 undervoltage lockout . . . . . . . . . . . . . . . . . . . 14 8.5 soft start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8.6 peak current limit . . . . . . . . . . . . . . . . . . . . . . 14 8.7 i 2 c-bus protocol . . . . . . . . . . . . . . . . . . . . . . . 14 8.7.1 addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8.7.2 data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8.7.3 register map . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 application design-in information . . . . . . . . . 17 9.1 input capacitor . . . . . . . . . . . . . . . . . . . . . . . . 17 9.2 output capacitor . . . . . . . . . . . . . . . . . . . . . . . 17 9.3 inductor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 9.4 rectifier diode. . . . . . . . . . . . . . . . . . . . . . . . . 18 9.5 pcb layout . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 10 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 19 11 thermal characteristics . . . . . . . . . . . . . . . . . 20 12 characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 20 13 package outline. . . . . . . . . . . . . . . . . . . . . . . . 23 14 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 24 15 revision history . . . . . . . . . . . . . . . . . . . . . . . 24 16 legal information . . . . . . . . . . . . . . . . . . . . . . 25 16.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 25 16.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 16.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 25 16.4 trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 25 17 contact information . . . . . . . . . . . . . . . . . . . . 25 18 contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

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