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power management www.semtech.com miniature integrated high current lithium-ion battery charger SC805A power management description style name _greenbartext features applications fully integrated charger with fet pass transistor, reverse-blocking diode, sense resistor and thermal protection high accuracy charge current* tiny 3mm x 3mm 0-lead mlpd package programmable pre-charge, fast-charge and termination current battery voltage controlled to % accuracy built-in timer for protection and complete charging ntc interface with battery detection soft-start to reduce adapter in-rush current up to a continuous charge current input voltage range from 3v to 6v allows seamless charging from current limited adapter provides adapter voltage vccil to power external accessories battery present detection and output indicator operates in charger or ldo-mode without battery 0. a battery drain current in shutdown and monitor modes over-current protection in all charging modes chrgb output communicates charging and end-of-charge cycle *us patent 6,836,095 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? the SC805A is a fully integrated, single cell, constant- current (cc)/constant-voltage (cv) lithium-ion battery charger in a tiny 3x3 mm thermally enhanced lead-free mlp package. the SC805A can operate as a stand-alone charger or in conjunction with a power management inte - grated circuit (pmic). the SC805A has a pre-charge function for trickle charging deeply discharged batteries. the fast-charge current is enabled automatically when the battery voltage reaches the required threshold. when the battery reaches the constant voltage or cv portion of the charge curve, the SC805A switches to cv regulation mode. in this mode the output current decays as the battery charges until the termination current is reached and the SC805A signals the charge cycle is complete. the SC805A can be confgured to continue charging for a pre-determined time before turning off, or to turn off immediately upon termination. after turning off its output, the SC805A enters monitor mode. if the battery voltage drops by 00mv from the cv voltage a new charge cycle will begin. the timer function also protects against charging faulty batteries by turning off if the pre-charge time exceeds ? of the total programmed charge duration. the SC805A also provides battery detection, and a battery ntc thermistor interface to disable charging when the battery temperature exceeds safe-to-charge limits. the SC805A can also function as a general purpose current source or as a current source for charging nickel-cadmium (nicd) and nickel-metal-hydride (nimh) batteries. c 1 1 f battery r 7 1 k sc 805 a 1 7 9 4 5 10 2 8 3 6 vcc en / ntc rtime iprgm iterm chrgb vccil nobat vout gnd r 4 3 . 01 k rt 1 thermistor d 2 led c 1 2 . 2 f charging indicator d 3 led r 5 3 . 01 k r 2 3 . 01 k r 1 3 . 01 k sc 805 a typical application circuit d 1 led charger vin r 3 39 . 2 k adapter present indicator charge complete indicator r 6 1 k features applications typical application circuit description cellular phones pdas handheld meters charging stations usb chargers digital cameras programmable current source ? ? ? ? ? ? ? march 3, 2007
2 ? 2007 semtech corp. SC805A www.semtech.com power management parameter symbol maximum units vcc vccil enntc to gnd -03 to 0 v vout nobat iprgm chrgb iterm rtime to gnd -03 to +0 v power dissipation mlp (derate 20m c above 85c) p d 2 thermal impedance unction to case peak ir refow temperature, soldering 20s-40s parameter symbol condition 25 c ta (-40 c to +85 c) units min typ max min max input voltage 5 35 5 v operating current icc dis shutdown mode en 0 01 1 a icc chg charging mode chrgb iterm iprg 0a 12 155 ma battery leakage current ileak bat vcc 0v 01 1 a regulated voltage vbat vbat load 5ma 420 41 424 v battery pre-charge current ipre iterm resistor 301k 50 44 54 ma battery termination current iterm 50 445 53 notes: ( ) calculated from package in still air, mounted to 3 to 4.5, 4 layer fr4 pcb with thermal vias under the exposed pad per jesd5 standards. absolute maximum rating electrical characteristics exceeding the specifcations below may result in permanent damage to the device or device malfunction. operation outside of the parameters specifed unless otherwise noted: vcc = 4.75v - 5.25v .
? 2007 semtech corp. www.semtech.com SC805A 3 power management electrical characteristics (cont.) parameter symbol condition 25 c ta (-40 c to +85 c) units min typ max min max battery fast-charge current (1) ifast 1 iprgm 15k 100 15 1115 ma ifast 2 iprgm 18k 8 -5 +5 vbatter 38v dropout voltage 500mv battery fast-charge max current limit 28v vbatter vbat 10 a iprog regulated voltage v iprgm 15 142 158 v iterm regulated voltage v iterm 15 142 158 v vin ovp rising threshold vt ovpr 8 4 5 v vin ovp falling theshold vt ovpf 4 5 15 v vin ovp hysteresis vt ovph 35 150 mv vin uvlo rising threshold vt uvlor 28 35 v vin uvlo falling threshold vt uvlof 25 25 325 v vin uvlo hysteresis vt uvloh 50 30 mv vbat pre-charge threshold vt prer 28 2 2 v vbat recharge threshold vt re vbat - vbatter 100 0 140 mv pre-charge fault time-out t pfault rtime 32k 38 30 44 min charge complete time-out t fast rtime 32k 25 20 30 hrs time disable threshold vt timer rtime vil voltage 10 0 v ldo-mode select threshold vt iintts vcc-rtime voltage 11 0 v electrical characteristics (cont.)
4 ? 2007 semtech corp. SC805A www.semtech.com power management parameter symbol condition 25 c ta (-40 c to +85 c) units min typ max min max en-ntc thresholds vt dis SC805A disable 11 0 v vt ntch ntc hot vth vcc 5 03v cc 024v cc 0314v cc v vt ntcc ntc cold vth vcc 5 05v cc 03v cc 05v cc v vt nobat no battery detect vcc 5 05v cc 03v cc 0v cc v ntc hs hotcold hysteresis 50 mv over-temperature shutdown ot hysteresis 10c 150 c chrgb led output vcb voh charge complete isrc 2ma 45 43 50 v vcb vol charging isnk 2ma 02 005 05 v icb off disable or ldo-mode off-leakage off-leakage ? lfqred electrical characteristics (cont.) note: () charge current is reduced by vccil current. vccil current is not limited by the ic.
? 2007 semtech corp. www.semtech.com SC805A 5 power management marking information device package (1) SC805Amltrt (2) mlp-10 SC805Aevb evaluation board notes: ( ) only available in tape and reel packaging. a reel contains 3000 devices. (2) lead-free product. this product is fully weee and rohs compliant. vcc vccil vout iprgm chrgb rtime nobat top view en / ntc iterm gnd 0 9 8 7 6 5 4 3 2 sc 805 a mlp - 10 3 mm x 3 mm 10 lead t marking for the pin confguration ordering information marking information
6 ? 2007 semtech corp. SC805A www.semtech.com power management en / ntc rtime gnd chrgb 10 8 iprgm vccil vout 4 3 5 1 9 7 6 2 vcc iterm nobat vout reference voltages vout ref fast - charge ref pre - charge ref control vout ref ntc interface timer pre - charge on fast - charge on over - temp under - voltage over - voltage pre - charge ref fast - charge ref block diagram
? 2007 semtech corp. www.semtech.com SC805A 7 power management pin descriptions (cont.) pin pin name pin function 1 vcc supply pin connect to adapter power 2 vccil adapter input voltage C this pin provides a bias voltage approximately equal to the adapter current limit program pin for charge and ldo-mode C requires a resistor to ground to program fast-charge current. selection for current termination and pre-charge current C requires a resistor to ground to analog voltages between 0.3vcc and 0.75vcc enable the ntc function. v oltages above 95% of vcc force the nobat output high. battery present indicator C this output goes high when the ntc voltage exceeds 95% of output status indicator designed to drive two leds. connect cathode of the charging led to this pin to indicate charge in progress. connect the anode of the charge pad is for heatsinking purposes pin descriptions
8 ? 2007 semtech corp. SC805A www.semtech.com power management general operation the SC805A is confgured based on the application for fast- charge and termination current, timing requirements, and operation with and without a battery (ldo mode). a typical charging cycle is described below. details on alternate ap - plications and output programmability are covered in the individual sections. the charging cycle begins when the adapter is plugged in. the SC805A performs glitch fltering on the vcc input and initiates a charge cycle when vcc > uvlo. at this time, the chrgb signal is active low turning on the charging led. if the battery voltage is less than 2.8v, the SC805A will charge the output with the pre-charge current. when the battery voltage exceeds 2.8v, the SC805A enters fast-charge or constant current (cc) mode. when the battery voltage reaches its fnal value, the charger enters the constant volt - age (cv) mode. in this mode the output current decreases as the battery continues to charge until the termination current level is reached. the chrgb pin goes high when vout output current is less than the programmed termination current, turning off the charging led and turning on the charge complete led. the SC805A continues to hold the battery in cv charge mode until the timer expires. at this point the charger enters the monitor mode where the output remains off until vout drops by 00mv and a new charge cycle is initiated. pre-charge mode pre-charge mode is automatically enabled whenever the battery voltage is below 2.8v. it is used to limit the power dissipation and precondition the battery for fast charging. the pre-charge current value is selected by the resistor on the iterm pin. the pre-charge current is programmable from 0ma to 25ma. the equation to select the pre- charge current is given by: 100 r 1.5 pci term x ? 1 ? if the charge timer is in use there is also a maximum al - lowed pre-charge duration. if the pre-charge time exceeds ? of the total charge cycle, the charger will turn off due to a pre-charge fault. this fault is cleared when en or vcc is toggled or the output voltage rises above 2.8v. fast-charge mode (cc) the fast-charge or cc mode is active when the battery volt - age is above 2.8v and less than the cv or fnal foat charge voltage of the battery. the fast-charge current can be set to a maximum of .0a and is selected by the program resistor on the iprgm pin. the voltage on this pin will represent the current through the battery enabling a microprocessor via an analog-to-digital converter (adc) to monitor battery current by sensing the voltage on the iprgm pin. the equa - tion to set the fast-charge current is given by: note that for a given program resistor the current through the battery in cv mode can be determined by replacing .5 with the actual voltage on the iprgm pin in the above equation. the superior fast-charge current accuracy of the SC805A is obtained by use of us patent 6,836,095 polarity-switched (i.e., chopped) current sense amplifer to nullify current measurement offset errors. termination current once the battery reaches the program voltage of 4.2v the device will transition from a constant current source to a constant voltage source and the current through the battery begins to decrease while the voltage remains constant. when the current falls below the programmed termination current set by the termination resistor on the iterm pin, the SC805A will transition the chrgb pin from low to high. if the timer is enabled the output will continue to foat charge in cv mode until the timer expires. if the timer is disabled than the output will turn off as soon as the termination current level is reached. if the part is in ldo mode the SC805A will remain on indefnitely at the regulated cv voltage. the equation to set the termination current is given by: 100 r 1.5 iterm term x ? 1 ? applications information 1000 r 1.5 fci prgm x ? 1 ?
? 2007 semtech corp. www.semtech.com SC805A 9 power management monitor mode when a charge cycle is completed, the SC805A output turns off and the device enters monitor mode. if the voltage of the battery falls below the recharge threshold of cv- 00mv the charger will clear the charge timer and re-initiate a charge cycle. the maximum current drain of the battery during monitor mode will be no more than a over temperature. the status of the charger output as a function of rtime, and vout current is shown below. output state rtime timer vout current on vcc n/a n/a on r t < timer n/a off r t > timer n/a on low disabled > termination off low disabled < termination charge timer the timer on the SC805A is used as protection in the case of a faulty battery and to maximize charging capacity. con - nect a resistor from the rtime pin to gnd to select the desired charge time duration according to the following equation. 2.5hrs 39.2k r time charge time x ? 1 ? the timer is programmable over the range of to 0 hours. to disable the charge timer, connect rtime to gnd. driving the rtime pin to vcc will disable the timer and select ldo- mode operation for the SC805A. one implementation of this feature is discussed in the nobat operating section. the SC805A will automatically turn off the output when the charge timer times out. nobat output the SC805A detects the absence of the battery by monitor - ing the voltage on the ntc pin. when the ntc pin voltage exceeds 95% of vcc, the nobat output is driven high. this function utilizes the standard ntc confguration with the ntc component residing in the battery pack. when the battery is removed the ntc element in the resistor divider is missing and the ntc voltage is pulled up to vcc. the nobat output can be used to signal the system that the battery has been removed, drive an external led, or fed back to the SC805A to select ldo-mode. connect the nobat pin to the rtime pin to select ldo mode when the battery is removed and re-enable the output of the SC805A. ldo mode the SC805A is designed to work with or without a battery. if the battery is not in place the device can enter ldo mode. in this mode the SC805A will act like a low dropout regulator. the input pin rtime is used to select ldo mode. if rtime is high the device will be in ldo mode. when ldo mode is selected and the en-ntc pin is greater than 90% of vcc the output will be on in ldo mode. during ldo mode the device will regulate the output voltage with a current limit set by the resistor tied to the iprgm pin. en-ntc interface the enable pin on the SC805A provides three functions: device disable, battery detection, and ntc temperature protection. it can be used to turn off the device by driving the pin to gnd. it can also be connected to an external resistor divider consisting of a resistor and an ntc thermis - tor to disable the charge cycle when the temperature is out of range. if the pin is pulled to vcc the SC805A will signal a no battery condition on the nobat pin. note: the SC805A will be disabled due to the ntc function when the no battery condition is detected due to the ntc feature. the ntc temperature fault can be overridden to re-enable the output of the charger for no battery conditions as described in the nobat section of the datasheet. the ntc external component confguration is shown in the typical application schematic on page of the datasheet. when the ntc voltage from the divider is above or below the cold and hot temperature threshold values, the SC805A will suspend the charge cycle by turning off the output, freezing the charge timer, and indicating a fault on the chrgb led. hysteresis is included for both hot and cold thresholds to avoid chatter at the ntc trip points. when the temperature returns to the valid range, the SC805A will automatically resume the charge cycle. the charge timer will time-out when the SC805A output on-time exceeds the timer setting regardless of how long it has been disabled applications information (cont.)
0 ? 2007 semtech corp. SC805A www.semtech.com power management applications information (cont.) due to the ntc temperature. the internal ntc thresholds of 30% and 75% vcc were designed to work with curve-2 type thermistors available from numerous vendors. design example based on the typical application schematic of page using a curve--2, vishay-dale ntc. thot = 50 c tcold = 0 c find r2 and rt step : pick an rt value high enough to prevent self- heating. 2 dc 1) v(rt 1 rt ? 1 ? t in general, lower values of rt provide more noise immu - nity for the ntc voltage at the expense of bias current from the input adapter. the dissipation constant dc is the power rating of the ntc resulting in a c self-heating error. the dc value for this ntc is 3mw and the voltage across the ntc is 2.5v for a 5v adapter. therefore, rt > 2k, set rt = 0k step 2: find r2 to set the correct hot level trip point, 9.52k r r r 2.33 r2 t25 t50 t25 ? ? 1 ? ? 1 ? x x the closest standard resistor value is 9.53k. rt(temp)/ rt(25 c) is often referred to as the ratio at the given temp. for this ntc at 50 c, the ratio is 0.4086. step 3: calculate the tcold value. 2.86 10k r2 3 rt rt 25 cold ? 1 ? x ? 1 ? the ratio for the curve-2 ntc at 0 c is 2.8 6. the differ - ence represents less than /2 c (i.e., actual trip would be -0.5 c instead of 0 c.) for temperature trip values other than 0 c and 50 c, alternate curve-type ntc elements can be used or an additional resistor can be added to the rntc divider to alter the temperature coeffcient. the chrgb led driver on the SC805A can be used to drive two external leds: chrgb=low (charging) and chrgb=high (charge complete). the chrgb output will be high impedance when the vcc is in a uv condition. the table below defnes the chrgb led output states. chrgb iout < iterm iout > term vcc < uv pre-charge ov or ntc fault the chrgb output can be used for a vcc indicator. when the SC805A is enabled, the chrgb output is either high or low providing the vcc input is above uvlo. the chrgb output signifes the charging status. when the output current is greater than termination current, chrgb=low. chrgb is high when iout is < itermination. the chrgb output is latched high at the end of the charge cycle when the output current is less than itermination. the chrgb output will remain high until the timer expires and vbatt enters a re-charge cycle, or if en, or vcc are toggled. the chrgb indicator operates the same way in both charge and ldo mode. the chrgb output can be used for a vcc indicator. when the SC805A is enabled the chrgb output is either high or low providing the vcc input is above uvlo. alternately an led connected to vccil can be used for a vcc indicator as shown in the typical application schematic on page . there are fve fault modes detected by the SC805A; (input under-voltage, input over-voltage, ntc temperature, max die temperature (or ot) and pre-charge timeout). the led states for these fault modes are shown below. fault chrgb vcc uvlo high-z vcc ovp blinking ntc fault blinking pre-charge time-out blinking t j > 150c blinking
? 2007 semtech corp. www.semtech.com SC805A power management applications information (cont.) over-current and max temperature protection over-current protection is inherent in all modes of opera - tion. when the device is in charge-mode the output is cur - rent-limited to either the pre-charge current limit value or the fast-charge current limit value depending on the voltage at the output. when the device is in ldo mode, the output current is limited to the fast-charge current limit. max die temperature protection is included on the SC805A. this feature allows the SC805A to operate with maximum power dissipation by disabling the output current when the die temperature reaches ot. the result is that the SC805A will operate as a pulse charger in extreme power dissipa - tion applications delivering the maximum allowable output current while regulating the internal die temperature to a safe level. layout guidelines the two most critical aspects of the pcb layout are the power path and thermal layout. the power path starts at the adapter + input and runs to the vcc input of the SC805A, then from the vout pin of the SC805A to the bat - tery + terminal, and completes with the return trace from the battery - terminal to the adapter - input. all of these traces need to be designed to handle the required charging current. the trace from vout of the SC805A is most critical and should be made as wide as possible to minimize ir drops between the regulated voltage at the SC805A vout pin and the battery terminal. keep the adapter+ to SC805A vcc input trace wide to minimize voltage drops that will add to the dropout voltage of the SC805A. the gnd pin of the SC805A should be connected in a kelvin fashion at the battery-terminal to eliminate voltage drops in the return path which reduce the regulated battery voltage. the thermal performance of the SC805A package requires a low impedance connection from the heat slug on the bottom of the package to an external ground plane. this is best accomplished by using a single large via under the device connected to a ground plane on the bottom exposed side of the pcb. the evaluation board uses square inch of copper on the bottom of the pcb and is capable of a charging current. the input and output bulk decoupling capacitors for the SC805A should be placed near the external terminals for the adapter and battery. this short low impedance loop is for the high current spikes that result from input/output hot-plugging of the charger. to minimize these current spikes the value of the decoupling capacitor should be mini - mized. a typical application requires a 0. f input/output capacitor. if the distance from the external terminals to the SC805A is greater than inch, 0. f local decoupling capacitors at the SC805A may be required.
2 ? 2007 semtech corp. SC805A www.semtech.com r 12 0 vout + 1 r 5 1 e 6 nobat 1 d 2 led en - ntc 1 ipgm 1 r 11 40 k vout - 1 charging indicator r 2 1 k chrgb 1 r 6 3 . 01 k rtime 1 c 1 2 . 2 uf vccil 1 r 9 3 . 01 k r 1 1 k chrg + 1 chrg - 1 r 10 3 . 01 k adapter present indicator r 8 no pop r 7 no pop r 3 no pop r 805 0 d 1 led c 2 1 uf d 3 no pop r 4 1 e 6 sc 805 a 1 7 2 4 5 10 3 8 9 6 vcc en - ntc vccil iprgm iterm chrgb vout nobat rtime gnd itrm 1 r 806 no pop charge complete indicator power management evaluation board schematic
? 2007 semtech corp. www.semtech.com SC805A 3 power management typical characteristics battery charge profile 3 3 2 3 4 3 3 8 4 4 2 4 4 0 0 0 0 0 0 1 2 3 0 0 2 5 0 0 0 3 3 0 0 5 0 0 0 1 0 2 3 0 1 1 5 0 0 1 2 3 0 1 4 0 0 0 1 5 2 3 0 2 0 5 0 0 2 1 3 0 2 3 0 0 0 2 4 2 3 0 2 5 5 0 0 3 0 3 0 3 2 0 0 0 3 3 2 3 0 3 4 5 0 0 time v o l t a g e ( v o l t s ) 0 0 1 0 2 0 3 0 4 0 5 0 c u r r e n t ( a m p s ) v charge v chrgb i charge vchrgb voltage not to scale shown to indicate timing 0 0 05 0 1 0 15 0 2 0 25 100 250 500 0 25 0 3 0 35 0 4 0 45 0 5 0 55 0 0 5 0 0 5 vdrop rout 0 20 40 0 80 100 120 140 1 e + 0 5 1 e + 0 5 0 0 0 0 0 0 0 0 5 0 0 0 0 3 0 0 0 0 1 5 0 0 0 0 1 2 3 4 5 8 pre - charge time - out fast - charge timeout 0 100 200 300 400 500 00 00 800 00 1 8 0 2 1 4 0 2 5 0 0 3 0 0 0 3 5 0 5 0 0 0 5 0 0 1 5 0 0 0 3 0 0 0 0 fast charge current 0 10 20 30 40 50 0 0 80 0 1 8 0 2 1 4 0 2 5 0 0 3 0 0 0 3 5 0 5 0 0 0 5 0 0 1 5 0 0 0 3 0 0 0 0 pre - charge current output current (ma) rpgrm value (?) rtime (?) rpgrm value (?) drop-out resistance (?)
4 ? 2007 semtech corp. SC805A www.semtech.com power management typical characteristics (cont.) 350 . 0 370 . 0 390 . 0 410 . 0 430 . 0 450 . 0 470 . 0 490 . 0 510 . 0 3 3 . 5 4 4 . 5 5 5 . 5 - 30 . 00 % - 25 . 00 % - 20 . 00 % - 15 . 00 % - 10 . 00 % - 5 . 00 % 0 . 00 % 5 . 00 % fast - charge current % error 35 . 0 37 . 0 39 . 0 41 . 0 43 . 0 45 . 0 47 . 0 49 . 0 51 . 0 3 3 . 5 4 4 . 5 5 5 . 5 - 30 . 00 % - 25 . 00 % - 20 . 00 % - 15 . 00 % - 10 . 00 % - 5 . 00 % 0 . 00 % 5 . 00 % pre - charge current % error 4 . 204 4 . 205 4 . 206 4 . 207 4 . 208 4 . 209 4 . 21 4 . 211 0 5 0 1 0 0 1 5 0 2 0 0 2 5 0 3 0 0 3 5 0 4 0 0 4 5 0 5 0 0 - 0 . 10 % - 0 . 09 % - 0 . 08 % - 0 . 07 % - 0 . 06 % - 0 . 05 % - 0 . 04 % - 0 . 03 % - 0 . 02 % - 0 . 01 % 0 . 00 % loaded vout loaded error (%) 4 . 201 4 . 202 4 . 203 4 . 204 4 . 205 4 . 206 4 . 207 4 . 208 4 . 209 4 . 21 4 . 5 5 . 0 5 . 5 6 . 0 6 . 5 - 0 . 10 % - 0 . 08 % - 0 . 06 % - 0 . 04 % - 0 . 02 % 0 . 00 % 0 . 02 % 0 . 04 % 0 . 06 % 0 . 08 % 0 . 10 % unloaded vout loaded vout unloaded error (%) loaded error (%) 495 496 497 498 499 500 501 3 . 0 0 3 . 2 0 3 . 4 0 3 . 6 0 3 . 8 0 4 . 0 0 4 . 1 0 4 . 1 5 4 . 2 0 - 5 . 00 % - 4 . 00 % - 3 . 00 % - 2 . 00 % - 1 . 00 % 0 . 00 % 1 . 00 % 2 . 00 % 3 . 00 % 4 . 00 % 5 . 00 % fast charge current fast charge error (%) 492 493 494 495 496 497 498 499 500 501 502 4 . 3 4 . 5 4 . 7 4 . 9 5 . 1 5 . 5 5 . 75 6 6 . 5 - 5 . 00 % - 4 . 00 % - 3 . 00 % - 2 . 00 % - 1 . 00 % 0 . 00 % 1 . 00 % 2 . 00 % 3 . 00 % 4 . 00 % 5 . 00 % fast charge current fast charge error (%) fast-charge current line regulation (vin) output current (ma) input voltage vcc (v) percent error (%) output voltage line regulation (vin, iout) output voltage (v) percent error (%) input voltage vcc (v) percent error (%) input voltage vcc (v) output current (ma) cc current limit, vcc < 4.2v fast-charge current line regulation (vin) output current (ma) percent error (%) output voltage vout (v) output voltage load regulation (iout) percent error (%) output voltage (v) output current (ma) percent error (%) input voltage vcc (v) output current (ma) pre-charge current limit, vcc < 4.2v
? 2007 semtech corp. www.semtech.com SC805A 5 power management state diagram shutdown mode vout / iout off chrgb high z soft start cc mode start pre - charge ovp > vin > uvlo iout = 1500 / rprog iout = 150 / rterm under - voltage will force the sc 805 a into shutdown mode from any state . over - voltage will disable the output , suspend the timer , and blink chrgb . monitor mode vout = off float charge mode vout = cv yes soft start vout yes en = hi timer enabled ? start timer vout > 2 . 8 v time > tmax / 4 iout < iterm vout = cv start cv mode chrgb low chrgb high timer enabled ? time > tmax vout < cv - 100 mv pre - charge timeout fault chrgb blinks at 1 hz cleared by vbat > 2 . 8 v or re - cycle en or vcc ntc out of range fault chrgb blinks at 1 hz timer is frozen charge resumes when ntc temperature is valid 0 o c > ntc temp > 50 o c cc = constant current cv = constant voltage yes yes yes yes yes yes yes time = 0 iout < iterm chrgb high yes time > tmax yes
6 ? 2007 semtech corp. SC805A www.semtech.com power management min aaa bbb b e l n d c e a 1 a 2 a dim millimeters nom dimensions max nom inches min max . 114 . 118 . 122 2 . 90 3 . 00 3 . 10 - - - - ( laser mark ) indicator pin 1 1 n 2 notes : controlling dimensions are in millimeters ( angles in degrees ). coplanarity applies to the exposed pad as well as terminals . 2 . 1 . . 003 . 007 . 042 10 . 009 . 048 - . 000 . 031 (. 008 ) 0 . 08 0 . 23 10 . 011 . 052 0 . 18 1 . 06 . 039 - . 002 - 0 . 00 0 . 80 1 . 31 0 . 30 1 . 21 - 0 . 05 1 . 00 ( 0 . 20 ) . 004 0 . 10 0 . 50 bsc . 020 bsc 0 . 30 . 012 . 020 . 016 0 . 40 0 . 50 a aaa c a 2 seating plane a 1 a bxn bbb c a b b e c c d lxn e e . 074 . 079 . 083 1 . 87 2 . 02 2 . 12 outline drawing - mlpd-3x3- 0
? 2007 semtech corp. www.semtech.com SC805A 7 power management contact information . 087 . 055 2 . 20 1 . 40 . 150 . 020 . 012 . 037 3 . 80 0 . 30 0 . 95 0 . 50 (. 112 ) . 075 1 . 90 ( 2 . 85 ) k h x this land pattern is for reference purposes only . consult your manufacturing group to ensure your company ' s manufacturing guidelines are met . notes : 1 . inches dimensions g k h x y p z c dim millimeters y z g ( c ) p land pattern - mlpd-3x3- 0 semtech corporation power management products division 200 flynn road, camarillo, ca 93012 phone: (805) 498-2111 fax: (805) 498-3804 contact information www.semtech.co m

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