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february 2011 doc id 18476 rev 1 1/29 29 STLDC08 step-up controller for led supply features input voltage range from 0.8 v to 3.6 v overvoltage protection drives n-channel mosfet or npn bipolar transistor no control loop compensation required fet driver for very precise pwm dimming applications single/dual cell nimh, nicd, or alkaline batteries small appliances led lighting portable lighting description the STLDC08 led driver step-up controller is optimized to operate from one or two nicd/nimh or alkaline cells. the ic is able to drive an external mosfet (n-channel) enabling it for use with wide power levels. hysteretic control eliminates the need for small signal control loop compensation. the ic integrates an fet driver for a precise pwm dimming. STLDC08 comes in a dfn10 (3 x 3 mm) package. dfn10 (3 x 3 mm) table 1. device summary order code marking package STLDC08pur STLDC08 dfn10 (3 x 3 mm.) www.st.com
contents STLDC08 2/29 doc id 18476 rev 1 contents 1 application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.1 main control loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.2 start up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.3 over voltage protection (ovp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7.4 enable/pwm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7.5 dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8.1 led current programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8.2 duty cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8.3 inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8.4 inductor peak current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8.5 power mosfet selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.6 schottky diode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.7 input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.8 output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9 demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 10 layout suggestion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 11 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
STLDC08 contents doc id 18476 rev 1 3/29 12 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
application diagram STLDC08 4/29 doc id 18476 rev 1 1 application diagram figure 1. electric schematic optimized for 2 leds and i led = 200 ma c1 c2 en/pwm battery l1 c6 m1 c4 c5 c 3 m2 rf r s rf b d1 u1 vcc 4 en/pwm 7 2vcc 3 gnd 8 v5 10 fb 5 pwmout 2 vout 1 s en s e 6 drv 9 exp 11 d2 d 3 am07 8 45v1 table 2. list of components reference manufacturer part number value size c1 murata grm21br60j475 4.7 f, 6.3 v 0805 c2 murata grm31cb31c106k 10 f, 16 v 1206 c4 murata grm188r70j103ka01b 10 nf, 6.3 v 0603 c3, c5, c6 murata grm188r61c105k 1 f, 16 v 0603 l coilcraft lps6235-103ml 10 h 6 mm x 6 mm m1,m2 stmicroelectronics sts5dnf20v so-8 d1 stmicroelectronics stps2l30 sma rfb 0.47 0805 rs 0.047 0805 rf 0 0603
STLDC08 application diagram doc id 18476 rev 1 5/29 figure 2. electric schematic optimized for 4 leds and i led = 300 ma c1 c2 l1 c6 m1 c4 c5 c 3 m2 rf r s rf b d1 u1 vcc 4 en/pwm 7 2vcc 3 gnd 8 v5 10 fb 5 pwmout 2 vout 1 s en s e 6 drv 9 exp 11 d2 d 3 d4 d5 battery en/pwm am07 8 92v1 table 3. list of components part reference manufacturer part number value size c1 murata grm21br60j106ke19 10 f, 6.3 v 0805 c2 murata grm31cr61c226k 22 f, 16 v 1206 c4 murata grm188r70j103ka01b 10 nf, 6.3 v 0603 c3, c5, c6 murata grm188r61c105k 1 f, 16 v 0603 m1,m2 stmicroelectronics sts5dnf20v so-8 d1 stmicroelectronics stps2l30 sma l coilcraft do3316p-223_l 22 h 12.95 mm x 9.4 mm rfb 0.33 0805 rs 0.033 0805 rf 0 0603
absolute maximum ratings STLDC08 6/29 doc id 18476 rev 1 2 absolute maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. table 4. absolute maximum ratings symbol parameter value unit v cc supply voltage - 0.3 to 4.6 v en/pwm analog input - 0.3 to 7 v fb analog input - 0.3 to 2 v sense analog input - 0.3 to 20 v 2v cc analog outputs 0 to 4 v v5 analog outputs - 0.3 to 7 v drv, pwmout analog outputs v cc - 1.2 to 7 v v out output voltage - 0.3 to 20 v esd human body model (all pins) 2kv p d dfn10l 3x3 t a = 25 c 2.2 w t j junction temperature - 40 to 85 c t stg storage temperature range - 55 to 85 c table 5. thermal data symbol parameter value unit r thjc thermal resistance junction-case 3 c/w r thja thermal resistance junction-ambient 57.1 (1) c/w 1. with two sides, two planes pcb following eia/jedec jesd51-7 standard.
STLDC08 pin configuration doc id 18476 rev 1 7/29 3 pin configuration figure 3. pin connections (top through view) top view bottom view table 6. pin description pin # pin name pin function 1 vout over voltage protection and supply pin for the ic when v out > 2 v 2pwmout driver of the external mosfet for pwm di mming. the driver stage is controlled by en/pwm signal 3 2vcc charge pump output 4vcc supply voltage when v out < 2 v, this pin represents the input of the internal charge pump 5 fb feedback pin for led current control 6 sense sense resistor for current mode control and peak current limit 7 en/pwm enable pin and pwm control input for pwmout pin 8 gnd ground reference 9 drv driver output for boost stage mosfet 10 v5 internal regulator output. decouple this pin locally to the ic ground with a minimum of 1 f ceramic capacitor exposed pad the exposed pad needs to be connected and soldered to analog ground
electrical characteristics STLDC08 8/29 doc id 18476 rev 1 4 electrical characteristics t a = -40 to 85; c in = 22 f; c out =10 f; pwmout = 3300 pf; dvr = 3300 pf; 2v cc =10 nf; v5 =1 f; v cc = 1.5v; v out = 3 v; fb = gnd; sense = gnd; en/pwm = v cc ; unless otherwise specified. table 7. electrical characteristics symbol parameter test conditions min. typ. max. unit general section v cc supply voltage range v out = gnd 0.8 3.6 v i vcc supply current measured on v cc pin with charge pump on v out = gnd 3 ma shutdown current en = gnd shutdown mode 5 10 a ovp overvoltage protection rising edge 18 19.5 v i vout operating supply current measured on v out pin v out = 3 v, fb = 500 mv (no switching) 60 100 a v out = 3 v, fb = gnd (switching) 800 a v out = 10 v, fb = gnd (switching) 1.3 2 ma shutdown current en = gnd 5 10 a 2vcc charge pump on v out floating; v cc = 0.8 v 1.5 v driver section (drv output) v drvl low level voltage i drv = 100 ma 80 160 mv v drvh high level voltage i drv = -100 ma 120 240 mv t r rise time c drv = 3300 pf 30 ns t f fall time c drv = 3300 pf 20 ns fb v fb feedback voltage t a = 25 c 90 105 116 mv i fb bias current fb = 2 v 20 500 na timing t off(min) minimum off time 1 s t on(max) maximum on time 20 s pwm out section v pwmoutl low level voltage i pwmout = 100 ma 200 400 mv v pwmouth high level voltage i pwmout = - 100 ma 250 500 mv t r rise time c pwmout = 3300 pf 30 ns t f fall time c pwmout = 3300 pf 20 ns
STLDC08 electrical characteristics doc id 18476 rev 1 9/29 symbol parameter test conditions min. typ. max. unit sense v sense max maximum current sense threshold 70 100 130 mv i sense bias current v sense = 20 v 10 20 a en/pwm section v il low level threshold v cc = 0.8 v 0.3 v v il low level threshold v cc = 3.6 v 0.4 v v ih high level threshold v cc = 0.8 v 0.8 v v ih high level threshold v cc = 3.6 v 1.2 v i en/pwm en/pwm pin current en/pwm = 3.6 v 2 a i en/pwm en/pwm pin current en/pwm = 5 v 5 a + 5 v regulator v5 output voltage v out = 6 v; i5 = 10 ma 4.8 5 5.2 v v5/ v out line regulation 6 v < v out < 18 v; i5 = 10 ma 0.02 %/v v5 load regulation 0 < i5 < 10 ma v out = 18 v 0.02 0.01 %/ma v dropout dropout voltage i5 = 10 ma 20 mv i cc short circuit current v out = 18 v; v5 = 0 v 140 ma table 7. electrical characteristics (continued)
typical performance characteristics STLDC08 10/29 doc id 18476 rev 1 5 typical performance characteristics figure 4. v fb vs. temperature figure 5. maximum v sense vs. temperature figure 6. i out vs. temperature fb = 0.5 v figure 7. i out vs. temperature fb = gnd figure 8. efficiency vs. input voltage 2 leds figure 9. efficiency vs. input voltage 4 leds !-v 4emperature ;?#= 6 &" ;m6= 6 /54 6 !-v 4emperature ;?#= 6 3%.3% ;m6= 6 /54 6 !-v 4emperature ;?#= ) 6/5 4 ;?!= 6 /54 6&"6 !-v 4emperature ;?#= ) 6/5 4 ;m!= 6 /54 6&"'.$ !-v 6 ## ;6= %ff ;= ) ,% $ m!,%$s !-v 6 ## ;6= %ff ;= ) ,% $ m!,%$s
STLDC08 typical performance characteristics doc id 18476 rev 1 11/29 figure 10. startup timing and dimming i led vs. time, 2 leds figure 11. dimming en/pwm = 200 hz, 2 leds v cc = 1.5 v; i led = 200 ma 2leds v cc = 1.5 v; i led = 200 ma 2leds figure 12. startup timing and dimming i led vs. time, 4 leds figure 13. dimming en/pwm = 200 hz, 4 leds v cc = 3.6 v; i led = 300 ma 4leds v cc = 3.6 v; i led = 300 ma 4leds figure 14. v cc = 1.5 v; i led = 200 ma , 2leds figure 15. v cc = 3.6 v; i led = 300 ma , 4leds
block diagram STLDC08 12/29 doc id 18476 rev 1 6 block diagram figure 16. block diagram ldo feedback comparator + - drv charge pump 2vcc vout vout r s q +5 v +5 v 100 mv 2vcc vcc pwmout ovp th fb en/pwm sensed current ramp peak current comparator driver - + + - sense ocp_th peak current control over voltage protection gnd driver t onmax = 20 sec toff timer t off = 1 sec ocp_th ocp fb reset gnd am07846v1 ldo feedback comparator + - drv charge pump 2vcc vout vout r s q +5 v +5 v 100 mv 2vcc vcc pwmout ovp th fb en/pwm sensed current ramp peak current comparator driver - + + - sense ocp_th peak current control over voltage protection gnd driver t onmax = 20 sec toff timer t off = 1 sec ocp_th ocp fb reset gnd am07846v1
STLDC08 detailed description doc id 18476 rev 1 13/29 7 detailed description 7.1 main control loop the STLDC08 is an led driver step-up controller dedicated to handheld equipment, having a typical voltage ranging from 0.8 v to 1.5 v. the controller drives an n-channel power mosfet and implements a hysteretic current mode control with constant off time. hysteretic operation eliminates the need for small signal control loop compensation. the control loop adapts the value of the inductor peak current as needed to deliver the desired current on the led branch. the led current is set by an external sense resistor r fb inserted between the feedback pin (fb) and gnd. when the curren t mode control system operates in continuous mode the control peak current is almost equivalent to the average current control. 7.2 start up at the startup phase, when the device is conn ected to the battery or when the en pin is pulled high, the internal 2x charge pump starts to work, boosting the voltage on the 2v cc pin. when the 2v cc pin reaches 1.7 v a soft-start cycle begins. the external main mosfet is switched on/off allowing the charging of the output capacitor. if the optional pwmout mosfet is used for the dimming operation, the pwmout pin is held low, further assuring that no current is flowing. the pwmout pin starts to follow the pwm input when the soft-start cycle is ended. when v out voltage exceeds 1.9 v, the chip star ts drawing its supply current from v out rather than from v cc , the charge pump is turned off and the voltage on the 2v cc pin goes to zero. when v out exceeds the forward voltage of led v led , the current starts flowing trough the led, but, at this point, the voltage on the drv pin is high enough to allow the main mosfet to carry the necessary current.
detailed description STLDC08 14/29 doc id 18476 rev 1 7.3 over voltage protection (ovp) as with any current source, the output voltage rises when the output gets high impedance or is disconnected. to prevent the output voltage exceeding the maximum switch voltage rating of the main switch, an overvoltage protection circuit is integrated. as soon as the output voltage exceeds the ovp threshold, the converter stops switching and the output voltage drops. when the output voltage falls below the ovp threshold, the converter continues operation until the output voltage exceeds the ovp threshold again. 7.4 enable/pwm the enable pin allows disabling and enabling of the device as well as brightness control of the leds by applying a pwm signal. in order to avoid visible flicker, the frequency of the pwm signal should be higher than 120 hz. changing the pwm duty cycle therefore changes the led brightness. figure 17. timing diagram v cc 2vcc drv pwmout v out i cc iled charge pump active STLDC08 supplied by v out v out > v led , the current starts flowing through the leds v out >1.9 v STLDC08 is supplied by v out follows en/pwm input soft start cycle ended, pwmout is realeased 1.7 v 1.9 v am07847v1 v cc 2vcc drv pwmout v out i cc iled charge pump active STLDC08 supplied by v out v out > v led , the current starts flowing through the leds v out >1.9 v STLDC08 is supplied by v out follows en/pwm input soft start cycle ended, pwmout is realeased 1.7 v 1.9 v am07847v1
STLDC08 detailed description doc id 18476 rev 1 15/29 7.5 dimming when pwmout goes to zero, the led current immediately goes to zero and the energy stored in the coil is discharged on the output capacitor, causing an increase in the output voltage. as soon as the pwm goes back to high value, there is a big spike current on the led. this could damage the led itself. to avoid this, as soon as the input pwm signal goes to zero the controller immediately turns off the main switch (in order to discharge the coil current on the led branch). in this way the pwm power is turned off with a delay in order to guarantee that fb goes high after powermos turn off. after this delay, the flip-flop is ready to be set and the pwm power is turned off. in this condition the output voltage is slightly lower than the regulated value, but a current spike on the led is avoided.
application information STLDC08 16/29 doc id 18476 rev 1 8 application information 8.1 led current programming the led current is set by an external resistor connected between the fb pin and gnd. the following equation can be used to calculate the value of the r fb resistor which guarantees the desired output current: equation 1 the feedback signal v fb is compared with the internal precision 100 mv voltage reference by the error amplifier. the internal reference has a guaranteed tolerance of 10 %. tolerance of the sense resistor adds additional error to the output voltage. 1 % resistors are recommended. 8.2 duty cycle the controlled off-time architecture is a hysteretic mode control. hysteretic operation eliminates the need for small signal control loop compensation. when the converter runs in continuous conduction mode (ccm) the controller adapts the t on time in order to obtain the duty cycle given by th e following relationship: equation 2 where v o is the output voltage given by: equation 3 and vd is the forward voltage of the schottky diode. 8.3 inductor selection as the hysteretic control scheme is inherently stable, the inductor value does not affect the stability of the regulator. th e switching frequency, peak inductor current, and allowable ripple of the output current determine the value of the inductor. led manufacturers generally recommend a value for led current ripple ranging from 5 % to 20 % of led average current. led fb i 1 . 0 r = d out in v v v 1 d + ? = fb ) led ( f o v v n v + =
STLDC08 application information doc id 18476 rev 1 17/29 as a first approximation we choose the inductor ripple current, i l , equal to approximately 40 % of the output current. higher ripple current allows for smaller inductors, but it also increases the output capacitance for a given led current ripple requirement. conversely, lower ripple current can be obtained increasing the value of the inductance, and this enables a reduction of the output capacitor value. this trade-off can be altered once standard inductance and capacitance values are chosen. i l is determined by the input and output voltage, the value of the inductance, and t off . the minimum value of inductance which guarantees the fixed inductor ripple current can be determined using the following equation: equation 4 where v d is the forward drop of the schottky diode, i l is the fixed inductor ripple current, and t off is the constant off time. the following equation shows the average inductor current as a function of the output current and duty cycle. equation 5 an inductor that can carry the maximum input dc current which occurs at the minimum input voltage should be chosen. the peak-to-peak ripple current is set by the inductance and a good starting point is to choose a ripple current of at least 40 % of its maximum value of the: figure 18. timing diagram i ripple i l t i peak i out t off t on d 1 i i out in ? = am07848v1 i ripple i l t i peak i out t off t on d 1 i i out in ? = am07848v1 off l inmin d out t ) i ( ) v - v + (v l > d 1 i i led ) avg ( l ? =
application information STLDC08 18/29 doc id 18476 rev 1 equation 6 where d max is given by: equation 7 the value of the peak current on the inductor is given by the following equation: equation 8 the minimum required saturation current of the inductor must be greater than i l(pk) and can be expressed as follows: equation 9 the saturation current rating for the induct or should be checked at the maximum duty cycle and maximum output current. 8.4 inductor peak current limit the value of the inductor peak current limit can be programmed either by using a sense resistor or by using the rdson of the main power mosfet. the following equation gives the relationship between the peak current limit and the value of the sense resistor: equation 10 the sense resistor value can be determined fixi ng the value of the inductor peak current limit equal to twice the value of the inductor peak current in steady-state conditions. max led ) avg ( l l d 1 i % 40 i % 40 i ? = = d out ) min ( in max v v v 1 d + ? = 2 i i i l ) avg ( l ) pk ( l + = 2 i d 1 i i i l max out ) pk ( l ) sat ( l + ? = > sense sense sense ) max ( in r 1 . 0 r v i = =
STLDC08 application information doc id 18476 rev 1 19/29 equation 11 equation 12 equation 13 if the r ds (on) of the main power mosfet is used to sense the current on the inductor the following procedure must be performed to choose the power mosfet. during on time, the sense comparator limits the voltage across the power mosfet to a nominal 100 mv. in that case, the maximum inductor current is given by the following relationships: equation 14 equation 15 equation 16 8.5 power mosfet selection a key parameter to take into account in the selection of the n-mosfet is the maximum continuous drain current. as a safety design, it is important to choose a maximum continuous drain current equal to twice the maximum input current. ) pk ( l ) max ( in i 2 i = 2 i d 1 i i l max led ) pk ( l + ? = ) pk ( l sense i 2 1 . 0 r = ) on ( ds ) on ( ds sense ) max ( l r mv 100 r v i = = ? ? ? ? ? ? ? ? + ? = = 2 i 1 d 1 i 2 i 2 i l max led ) pk ( l ) max ( l ? ? ? ? ? ? + ? < 2 i 1 i 2 d 1 1 . 0 r l led max ) on ( ds
application information STLDC08 20/29 doc id 18476 rev 1 another important parameter is the drain source breakdown voltage. during the on state, the potential of the lx point is 0 v, while during the off state the potential of this point rises to the output voltage plus the forward voltage of the d1. therefore, the absolute v ds rating of the main switch must be greater than this voltage to prevent main switch damage. figure 19. current diagram on state c in c out l1 d1 rsense vbat dvr STLDC08 sense vout lx led r fb fb on state am07849v1 c in c out l1 d1 rsense vbat dvr STLDC08 sense vout lx led r fb fb on state am07849v1 figure 20. current diagram off state c in l1 d1 rsense vbat dvr STLDC08 sense vout lx led r fb fb off state c out am07850v1 c in l1 d1 rsense vbat dvr STLDC08 sense vout lx led r fb fb off state c out am07850v1
STLDC08 application information doc id 18476 rev 1 21/29 8.6 schottky diode selection schottky diodes, with their low forward voltage and fast recovery time, are the ideal choice to maximize efficiency. the output diode in a bo ost converter conducts current only when the power switch is off. the average current is equal to the output current and the peak current is equal to the peak inductor current. ensure that the diode's average and peak current ratings exceed the average and peak inductor current, respectively. in addition, the diode's reverse breakdown voltage must exceed the regulator output voltage. 8.7 input capacitor the input capacitor of a boost converter is less critical than the output capacitor, due to the fact that the input current waveform is continuous. the input voltage source impedance determines the size of the input capacitor, which is typically in the range of 10 f to 100 f. a low esr capacitor is recommended though it is not as critical as the output capacitor. 8.8 output capacitor for best output voltage filtering, a low esr output capacitor is recommended. ceramic capacitors have a low esr value but tantalum capacitors can be used as well, depending on the application. the output voltage ripple consists of two parts, the first is the product i l(pk) esr, the second is caused by the charging and discha rging process of the output capacitor. equation 17 where: i l(pk) = peak current i led = load current c out = selected output capacitor esr = output capacitor esr value ) pk ( l out led out i esr c i ton v + =
demonstration board STLDC08 22/29 doc id 18476 rev 1 9 demonstration board figure 21. electrical schematic j4 en/pwm 1 2 3 tp1 vin 1 tp2 s w 1 tp 3 vout 1 tp4 s en s e 1 tp5 drv 1 c1 c2 l1 c6 m1 c4 c5 c 3 m2 rf r s rf b d1 u1 vcc 4 en/pwm 7 2vcc 3 gnd 8 v5 10 fb 5 pwmout 2 vout 1 s en s e 6 drv 9 exp 11 j 3 led 1 2 j1 power in 1 2 j2 gnd 1 2 am07900v1 table 8. bill of material optimized for 2 leds and i led = 200 ma reference manufacturer part number value size c1 murata grm21br60j475 4.7 f 6.3v 0805 c2 murata grm31cb31c106k 10 f 16 v 1206 c4 murata grm188r70j103ka01b 10 nf, 6.3 v 0603 c3, c5, c6 murata grm188r61c105k 1 f, 16 v 0603 l coilcraft lps6235-103ml 10h 6 mm x 6 mm m1,m2 stmicroelectronics sts5dnf20v so-8 d1 stmicroelectronics stps2l30 sma rfb 0.47 0805 rs 0.047 0805 rf 0
STLDC08 layout suggestion doc id 18476 rev 1 23/29 10 layout suggestion figure 22. assembly layer figure 23. top layer
layout suggestion STLDC08 24/29 doc id 18476 rev 1 figure 24. bottom layer
STLDC08 package mechanical data doc id 18476 rev 1 25/29 11 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack? packages, depending on their level of environmental compliance. ecopack? specifications, grade definitions and product status are available at: www.st.com. ecopack? is an st trademark.
package mechanical data STLDC08 26/29 doc id 18476 rev 1 dim. mm. mil s . min. typ. max. min. typ. max. a0. 8 00. 9 0 1.00 3 1.5 3 5.4 39 .4 a1 0.02 0.05 0. 8 2.0 a2 0.55 0.65 0. 8 0 21.7 25.6 3 1.5 a 3 0.20 7. 9 b 0.1 8 0.25 0. 3 07.1 9 . 8 11. 8 d2. 8 5 3 .00 3 .15 112.2 11 8 .1 124.0 d2 2.20 8 6.6 e2. 8 5 3 .00 3 .15 112.2 11 8 .1 124.0 e2 1.40 1.75 55.1 6 8 . 9 e 0.50 1 9 .7 l0. 3 0 0.40 0.50 11. 8 15.7 1 9 .7 ddd 0.0 83 .1 dfn10 ( 3 x 3 mm) mechanical data 7426 33 5f
STLDC08 package mechanical data doc id 18476 rev 1 27/29 dim. mm. inch. min. typ. max. min. typ. max. a1 8 0 7.0 8 7 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 14.4 0.567 ao 3 . 3 0.1 3 0 bo 3 . 3 0.1 3 0 ko 1.1 0.04 3 po 4 0.157 p 8 0. 3 15 tape & reel qfnxx/dfnxx ( 3 x 3 ) mechanical data
revision history STLDC08 28/29 doc id 18476 rev 1 12 revision history table 9. document revision history date revision changes 22-feb-2011 1 first release.
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