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RT9525 1 ds9525-01 may 2011 www.richtek.com linear single cell li-ion battery charger with auto power path general description the RT9525 is an integrated single cell li-ion battery charger with auto power path management (appm). no external mosfets are required. the RT9525 enters sleep mode when power is removed. charging tasks are optimized by using a control algorithm to vary the charge rate including pre-charge mode, fast charge mode and constant voltage mode. for the RT9525, the charge current can also be programmed with an external resister. additionally, the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. the charging task will always be terminated in constant voltage mode when the charging current reduces to the termination current of 20% i chg_fast . other features include under voltage protection and over voltage protection for the vin supply. features z z z z z 28v maximum rating for vin power z z z z z selectable power current limit (0.1a / 0.5a / 1.5a) z z z z z integrated power mosfets z z z z z auto power path management (appm) z z z z z programmable charging current timer and safe charge timer z z z z z under voltage protection z z z z z over voltage protection z z z z z power good and charger status indicator z z z z z optimized charge rate via thermal feedback z z z z z 16-lead wqfn package z z z z z rohs compliant and halogen free applications z digital cameras z pdas and smart phones z portable instruments ordering information note : richtek products are : ` rohs compliant and compatible with the current require- ments of ipc/jedec j-std-020. ` suitable for use in snpb or pb-free soldering processes. pin configurations (top view) wqfn-16l 3x3 bat ts bat nc sys sys en2 en1 gnd iseta sysoff vin timer 12 11 10 9 13 14 15 16 1 2 3 4 8 7 6 5 gnd 17 en pgood chg marking information jg=ym dnn jg = : product code ymdnn : date code RT9525 package type qw : wqfn-16l 3x3 (w-type) lead plating system g : green (halogen free and pb free)
RT9525 2 ds9525-01 may 2011 www.richtek.com functional pin description pin no. pin name pin function 1 ts thermistor monitor input. the ts pin connects to a battery?s thermistor to determine if the battery is too hot or too cold to charge. if the battery?s temperature is out of range, charging is paused until it re-enters the valid range. ts also detect whether the battery (with ntc) is present or not 2, 3 bat battery connect pin. 4 en charge enable, active-low input. 200k pull low. 5 en2 6 en1 input current limit configuration setting. 7 pgood power good status output. active-low, open-drain output. 8, 17 (exposed pad) gnd ground. the exposed pad must be soldered to a large pcb and connected to gnd for maximum power dissipation. 9 chg charger status output. active-low, open-drain output. 10, 11 sys system connect pin. connect this pin to system load with a minimum 10uf mlcc to gnd. 12 nc no internal connection. 13 vin supply voltage input. 14 timer safe charge timer setting. 15 sysoff system disconnect pin. pull sysoff high to disconnect sys from battery, connect to gnd for normal operation. internally pulled up by 1 a current source to bat. 16 iseta charge current set input. connect a resistor (r iseta ) between iset and gnd. typical application circuit vin gnd RT9525 sys 16 8, 17 (exposed pad) 2, 3 13 10, 11 bat iseta c bat + c in adapter or usb 4 sysoff 15 r iseta 2.2f 1f 1 ts c sys 10f en chip enable disconnect connect en1 en2 6 5 7 9 chg timer 14 c timer 1f pgood
RT9525 3 ds9525-01 may 2011 www.richtek.com function block diagram cc/cv/tr /appm multi loop controller logic sleep mode current set block ovp uvlo vin iseta bat gnd chg pgood 1a control circuit sys sysoff timer ts timer ts 200k 200k 200k en1 en2 en thermal circuit
RT9525 4 ds9525-01 may 2011 www.richtek.com electrical characteristics (v in = 5v, v bat = 4v, t a = 25 c , unless otherwise specification) parameter symbol test conditions min typ max unit supply input vin operating range 4.2 -- 6 v vin under voltage lockout threshold v uvlo 3.1 3.3 3.5 v vin under voltage lockout hysteresis v uvlo _hys -- 240 -- mv i sys = i bat = 0ma, en = l -- 1 2 vin supply current i in i sys = i bat = 0ma, en = h -- 0.8 1.5 ma vin suspend current i sus v in = 5v, en2 = en1 = h -- 195 333 a bat sleep leakage current i sleep v bat > v in , (v in = 0v) -- 5 15 a vin ? bat vos rising v os_h -- 200 300 mv vin ? bat vos falling v os_l 10 50 -- mv voltage regulation battery regulation voltage v reg 0 to 85c, i load = 20ma 4.16 4.2 4.23 v system regulation voltage v sys 5.3 5.5 5.7 v appm regulation voltage v appm en2 = l ,en1 = h 4.2 4.3 4.4 v dpm regulation voltage v dpm en2 = l 4.35 4.5 4.63 v vin to vsys mosfet ron r ds(on) i lim = 1000ma -- 0.2 0.35 absolute maximum ratings (note 1) z supply input voltage, v in ------------------------------------------------------------------------------------------------ ? 0.3v to 28v z chg, pgood -------------------------------------------------------------------------------------------------------------- ? 0.3v to 28v z other pins ------------------------------------------------------------------------------------------------------------------- ? 0.3v to 6v z chg, pgood continuous current ------------------------------------------------------------------------------------ 20ma z bat continuous current (total in two pin s) (note 2) ------------------------------------------------------------ 2.5a z power dissipation, p d @ t a = 25 c wqfn-16l 3x3 ------------------------------------------------------------------------------------------------------------ 1.471w z package thermal resistance (note 3) wqfn-16l 3x3, ja ------------------------------------------------------------------------------------------------------- 68 c/w wqfn-16l 3x3, jc ------------------------------------------------------------------------------------------------------ 7.5 c/w z lead temperature (soldering, 10 se c.) ------------------------------------------------------------------------------- 260 c z junction temperature ----------------------------------------------------------------------------------------------------- 150 c z storage temperature range -------------------------------------------------------------------------------------------- ? 65 c to 150 c z esd susceptibility (note 4) hbm (human body mode) ---------------------------------------------------------------------------------------------- 2kv mm (ma chine mode) ------------------------------------------------------------------------------------------------------ 200v recommended operating conditions (note 5) z supply input voltage, v in (en2 = h, en1 = l) --------------------------------------------------------------------- 4.45v to 6v z supply input voltage, v in (en2 = l, en1 = x) --------------------------------------------------------------------- 4.65v to 6v z junction temperature range -------------------------------------------------------------------------------------------- ? 40 c to 125 c z ambient temperature range -------------------------------------------------------------------------------------------- ? 40 c to 85 c to be continued
RT9525 5 ds9525-01 may 2011 www.richtek.com to be continued parameter symbol test conditions min typ max unit bat to vsys mosfet ron r ds(on) v bat = 4.2v,i sys = 1a -- 0.05 0.1 re-charge threshold v regcgg battery regulation ? recharge-level 120 200 280 mv current regulation iseta set voltage (fast charge phase) v iseta v batt = 4v, r iseta = 1k -- 2 -- v vin charge setting range i chg 100 -- 1200 ma vin charge current i chg v batt = 4v, r iseta = 1k 570 600 630 ma en2 = h, en1 = l (1.5a mode) 1.2 1.5 1.8 a en2 = l, en1 = h (500ma mode) 450 475 500 ma vin current limit i lim en2 = l, en1 = l (100ma mode) 80 90 100 ma pre-charge bat pre-charge threshold v prech bat falling 2.75 2.85 2.95 v bat pre-charge threshold hysteresis v prech -- 200 -- mv pre-charge current i prech v bat = 2v 5 10 15 % charge termination detection termination current ratio to fast charge i term 10 20 30 % termination current ratio to fast charge usb100ma i term2 en2 = l, en1 = l -- 3.3 -- % login input/output chg pull down voltage v chg i chg = 5ma -- 200 -- mv pgood pull down voltage v pgood i pgood = 5ma -- 200 -- mv v ih 1.5 -- - en, en1,en2, sysoff pin threshold v il -- -- 0.4 v protection thermal regulation t reg -- 125 -- c thermal shutdown temperature t sd -- 155 -- c thermal shutdown hysteresis t sd -- 20 -- c ovp set voltage v ovp v in rising 6.25 6.5 6.75 v ovp hysteresis v ovp_hys -- 100 -- mv output short circuit detection threshold v short v bat ? v sys -- 300 -- mv time pre-charge fault time t pchg c timer = 1 f (1/8 x t fchg ) 1440 1800 2160 s fast charge fault time t fc hg c timer = 1 f 11520 14400 17280 s pgood deglitch time t pgood time measured from v in : 0 ? 5v 1 s rise-time to pgood = l -- 1.2 -- ms input over voltage blanking time t ovp -- 50 -- s
RT9525 6 ds9525-01 may 2011 www.richtek.com note 1. stresses listed as the above ? absolute maximum ratings ? may cause permanent damage to the device. these are for stress ratings. functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. note 2. guaranteed by design. note 3. ja is measured in natural convection at t a = 25 c on a high-effective thermal conductivity four-layer test board of jedec 51-7 thermal measurement standard. the measurement case position of jc is on the exposed pad of the package. note 4. devices are esd sensitive. handling precaution is recommended. note 5. the device is not guaranteed to function outside its operating conditions. parameter symbol test conditions min typ max unit pre-charge to fast-charge deglitch time t pf -- 25 -- ms fast-charge to pr-charger deglitch time t fp -- 25 -- ms te rm in atio n deg litch tim e t termi -- 25 -- ms recharge d eglitch time t rechg -- 100 -- ms input power loss to sys ldo tu rn -off dela y ti me t no-in -- 25 -- ms packing temperature fault detection deglitch time t ts -- 25 -- ms short c ircuit, deglitch time t short -- 250 -- s short c ircuit recovery time t short_r 64 -- ms other nt c bias current i ntc v in > uvlo and v in > v bat + v os_h 72 75 78 a high temperature trip point v hot v ts falling 270 300 330 mv high temperature trip point h ysteresis v hot_hys v ts rising from v hot -- 30 -- mv low temperature trip point v cold v ts rising 2000 2100 2200 mv low temperature trip point h ysteresis v cold_hys v ts fallin g from v cold -- 300 -- mv
RT9525 7 ds9525-01 may 2011 www.richtek.com typical operating characteristics load transient response time (1ms/div) i in (1a/div) v in (10v/div) v sys (5v/div) i bat (2a/div) appm, 1.5a mode, v in = 5v, v bat = 3.7v r iseta = 1k , i sys = 0 to 2a i sys (2a/div) v bat (5v/div) sysoff on/off with input power time (5ms/div) v bat (5v/div) v sysoff (5v/div) v sys (5v/div) i bat (200ma/div) v in = 6v, v bat = 3.7v, 1.5a mode, r iseta = 1k v in = 5v, v bat = 3.7v, 1.5a mode, r iseta = 1k charger detect sequence time (10ms/div) chg (5v/div) en (5v/div) v bat (2v/div) i bat (500ma/div) sysoff on/off without input power time (5ms/div) v bat (5v/div) v sysoff (5v/div) v sys (5v/div) i bat (500ma/div) v in = nc, v bat = 3.7v, 1.5a mode, r iseta = 1k , r sys = 10k ovp fault time (50 s/div) v sys (2v/div) v in (10v/div) v bat (1v/div) i bat (500ma/div) v in = 5v to 15v, v bat = 3.7v, 1.5a mode, r iseta = 1k , r sys = 10 v in v sys v bat i bat charger chg status after safety timers expired time (250 s/div) v in (5v/div) chg (2v/div) v bat (2v/div) i bat (500ma/div) v in = 5v, v bat = 3.7v, r iseta = 620
RT9525 8 ds9525-01 may 2011 www.richtek.com charging current vs. battery voltage 0 100 200 300 400 500 600 700 22.5 33.5 44.5 battery voltage (v) charging current (ma) 1 1.5a mode, v in = 4.5v 1.5a mode, v in = 5v 1.5a mode, v in = 6v 500ma mode, v in = 5v v in = 5v, r iseta = 1k output regulation voltage vs. temperature 5.35 5.38 5.40 5.43 5.45 5.48 5.50 5.53 5.55 -50-25 0 255075100125 temperature (c) output regulation voltage (v) 1 v out @ 0a (v) v out @ 0.5a (v) v out @ 1a (v) v in = 5v battery voltage vs. charging time 0 0.9 1.8 2.7 3.6 4.5 0 2000 4000 6000 8000 10000 charging time (s) battery voltage (v) v in = 5v, 500ma mode battery current vs. charging time 0 0.1 0.2 0.3 0.4 0.5 0.6 0 2000 4000 6000 8000 10000 charging time (s) battery current (a) v in = 5v, 500ma mode time (25ms/div) v sys (1v/div) v bat (1v/div) v bat = 3.7v, v sys = gnd v sys short to gnd protection with battery charging current vs. r iseta 0 200 400 600 800 1000 1200 1400 0 1000 2000 3000 4000 5000 6000 r iseta ( ) charging current (ma) 1 v in = 5v, v bat = 3.7v ( )
RT9525 9 ds9525-01 may 2011 www.richtek.com ovp threshold voltage vs. temperature 6.33 6.36 6.39 6.42 6.45 6.48 6.51 6.54 -50 -25 0 25 50 75 100 125 temperature (c) ovp threshold voltage (v) rising v bat = 3.7v falling charger current vs. temperature 0.00 68.75 137.50 206.25 275.00 343.75 412.50 481.25 550.00 -50 -25 0 25 50 75 100 125 temperature (c) charger current (ma) 1 v in = 5v, v bat = 3.7v, 500ma mode dropout voltage (in-out) vs. temperature 0 50 100 150 200 250 300 350 400 450 -50 -25 0 25 50 75 100 125 temperature (c) dropout voltage (mv) 1 v in = 5v, i sys = 1a dropout voltage (bat-out) vs. temperature 0 10 20 30 40 50 60 70 -50 -25 0 25 50 75 100 125 temperature (c) dropout voltage (mv) v in = 3.7v, i sys = 1a
RT9525 10 ds9525-01 may 2011 www.richtek.com application information the RT9525 is a fully integrated single cell li-ion battery charger ideal for portable applications. the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. other features include under voltage protection and over voltage protection. pre-charge mode when the output voltage is lower than 2.8v, the charging current will be reduced to a fast charge current ratio set by r iseta to protect the battery life time. fast charge mode when the output voltage is higher than 3v, the charging current will be equal to the fast charge current set by r iseta . constant voltage mode when the output voltage is near 4.2v and the charging current falls below the termination current, after a deglitch time check of 25ms, the charger will become disabled and chg will go from l to h. re-charge mode when the chip is in charge termination mode, the charging current will gradually go down to zero. however, once the voltage of the battery drops to below 4v, there will be a deglitch time of 100ms, and then the charging current will resume again. charging current decision the charge current can be set according to the following equations : i chg_fast = v iseta / r iseta x 300 (a) i chg_pre = 10% x i chg_fast (a) where v iseta unit = v; r iseta unit = time fault the fast charge fault time can be set according to the following equations : fast charge fault time : t fchg = 14400 x c timer (s) pre-charge fault time : t pchg = 1/8 x t fchg (s) where c timer unit is f. during the fast charge phase, several events may increase the timer duration. for example, the system load current may have activated the appm loop which reduces the available charging current, the device has entered thermal regulation because the ic junction temperature has exceeded t reg . during each of these events, if 3v < v bat < 4v, the internal timers are slowed down proportionately to the reduction in charging current. however, once the duration exceeds the fault time, the chg output will flash at approximately 2hz to indicate a fault condition and a charger current ~ 1ma. t fchg_true = t fchg x t fchg_true : modified timer in fast charge t fchg : original timer in fast charge t fchg = 14400 sec x ( ) t pchg = t pchg : timer in pre-charge time fault release : (1) re-plug power (2) toggle /en (3) enter/exit usb suspend mode (4) removes battery (5) ovp note that the fast charge fault time is independent of the charge current. power good vin power good (pgood = l) input state pgood output v in < v uvlo high impedance v uvlo < v in < v bat + v os_h high impedance v bat + v os_h < v in < v ovp low impedance v in > v ovp high impedance iseta 2 v timer c 1 f fchg t 8
RT9525 11 ds9525-01 may 2011 www.richtek.com charge state indicator en2 en1 vin input current limit l l 90ma l h 475ma h l 1.5a h h suspend mode charge enable when en is low, the charger turns on. when en is high, the charger turn off. en is pulled low for initial condition. vin input current limit battery pack temperature monitoring the RT9525 features an external battery pack temperature monitoring input. the ts input connects to the ntc thermistor in the battery pack to monitor battery temperature and prevent dangerous over temperature conditions. if at any time the voltage at ts falls outside of the operating range, charging will be suspended. the timers maintain their values but suspend counting. when charging is suspended due to a battery pack temperature fault, the chg pin remains low and continues to indicate charging. when temperature reaches at ? too cold ? state, r ntc = r cold when temperature reaches at ? too hot ? state, r ntc = r hot from (1), (2), the r t1 and r t2 can be calculated by the following equations : t1 cold t2 ntc t1 cold t2 ntc (r + r ) r i = 2.1v (v) (r + r ) + r where i = 75 a (typ.) t1 hot t2 ntc t1 hot t2 (r + r ) r i = 0.3v (v) (r + r ) + r (1) (2) ) 22 hot cold t1 cold hot cold hot t1 hot t2 t1 hot 1500 (r + r ) r 3000 20 5625 x (r r ) + 105 (r r 3000 (r + r ) r 250 r + 250 r 1 ? ? ? =+ ?? = ? charge state chg output charging charging suspended by thermal loop low (for first charge cycle) safety timers expired 2hz flash charging done recharging after termination ic disabled or no valid input power high impedance figure 1 + - + - 2.1v 0.3v too cold too hot ts r t1 r t2 r ntc suspend mode set en1 = en2 = h, and the charger will enter suspend mode. in suspend mode, chg is in high impedance and i sus(max) < 330 a. power switch for the RT9525, there are three power scenarios : (1) when a battery and an external power supply (usb or adapter) are connected simultaneously : if the system load requirements exceed that of the input current limit, the battery will be used to supplement the current to the load. however, if the system load requirements are less than that of the input current limit, the excess power from the external power supply will be used to charge the battery. (2) when only the battery is connected to the system : the battery provides the power to the system. (3) when only an external power supply is connected to the system : the external power supply provides the power to the system.
RT9525 12 ds9525-01 may 2011 www.richtek.com appm profile 1.5a mode 1a 0 -1a 2a 3a -2a -3a 6v 5.5v 4.3v 4.0v i bat i sys i v in t1 t2 t3 t4 t5 t6 t7 v bat v in v sys v adpm time battery voltage charging current i chg_pre = i0% x i chg_fast v prech v rech 4.16 to 4.2 to 4.23v -40 to 85 c (en2, en1) = (l, h) i termi = 3.3% x i chg _ fast (en2,en1) = (h, l) or (l, h) i termi = 20% x i chg-fast i term i term2 thermal regulation and thermal shutdown the RT9525 provides a thermal regulation loop function to monitor the device temperature. if the die temperature rises above the regulation temperature, t reg , the charge current will automatically be reduced to lower the die temperature. however, in certain circumstances (such as high vin, heavy system load, etc.) even with the thermal loop in place, the die temperature may still continue to increase. in this case, if the temperature rises above the thermal shutdown threshold, t sd , the internal switch between vin and sys will be turned off. the switch between the battery and sys will remain on, however, to allow continuous battery power to the load. once the die temperature decreases by t sd , the internal switch between vin and sys will be turned on again and the device returns to normal thermal regulation. input dpm mode for the RT9525, the input voltage is monitored when the usb100 or usb500 is selected. if the input voltage is lower than v dpm , the input current limit will be reduced to stop the input voltage from dropping any further. this can prevent the ic from damaging improperly configured or inadequately designed usb sources. appm mode once the sum of the charging and system load currents becomes higher than the maximum input current limit, the sys pin voltage will be reduced. when the sys pin voltage is reduced to v appm , the RT9525 will automatically operate in appm mode. in this mode, the charging current is reduced while the sys current is increased to maintain system output. in appm mode, the battery termination function is disabled. battery supplement mode short circuit protect in appm mode, the sys voltage will continue to drop if the charge current is zero and the system load increases beyond the input current limit. when the sys voltage decreases below the battery voltage, the battery will kick in to supplement the system load until the sys voltage rises above the battery voltage. while in supplement mode, there is no battery supplement current regulation. however, a built in short circuit protection feature is available to prevent any abnormal current situations. while the battery is supplementing the load, if the difference between the battery and sys voltage becomes more than the short circuit threshold voltage, sys will be disabled. after a short circuit recovery time, t short_r , the counter will be restarted. in supplement mode, the battery termination function is disabled. note that for the battery supply mode exit condition, v bat ? v sys < 0v. battery disconnect (sysoff input) the RT9525 features a sysoff input that allows the user to turn off the switch to disconnect the battery from the sys pin.
RT9525 13 ds9525-01 may 2011 www.richtek.com i sys v sys t1, t7 0 sys regulation voltage t2, t6 < i vin_oc ? chg_max sys regulation voltage t3, t5 > i vin_oc ? chg_max < i vin_oc auto charge voltage threshold t4 > i vin_oc v bat ? i bat x r ds(on) i vin i bat t1, t7 chg_max chg_max t2, t6 i sys + chg_max chg_max t3, t5 vin_oc vin_oc ? i sys t4 vin_oc i sys ? i vin_oc i sys v sys t1, t7 0 sys regulation voltage t2, t6 < usb _oc ? chg_max sys regulation voltage t3, t5 > usb_oc ? chg_max < usb_oc auto charge voltage threshold t4 > usb_oc v bat ? i bat x r ds(o n) i usb i bat t1, t7 chg_max chg_max t2, t6 i sys + chg_max chg_max t3, t5 usb_oc usb_oc ? i sys t4 usb_oc i sys ? usb_oc 0.25a 0 -0.25a 0.5a 0.75a -0.5a -0.75a 5v 4.3v 4.0v i bat i sys i usb t1 t2 t3 t4 t5 t6 t7 v bat v usb v sys v appm usb 500ma mode thermal considerations for continuous operation, do not exceed absolute maximum junction temperature. the maximum power dissipation depends on the thermal resistance of the ic package, pcb layout, rate of surrounding airflow, and difference between junction and ambient temperature. the maximum power dissipation can be calculated by the following formula : p d(max) = (t j(max) ? t a ) / ja where t j(max) is the maximum junction temperature, t a is the ambient temperature, and ja is the junction to ambient thermal resistance. for recommended operating condition specifications of the RT9525, the maximum junction temperature is 125 c and t a is the ambient temperature. the junction to ambient thermal resistance, ja , is layout dependent. for wqfn- 16l 3x3 packages, the thermal resistance, ja , is 68 c/ w on a standard jedec 51-7 four-layer thermal test board. the maximum power dissipation at t a = 25 c can be calculated by the following formula : p d(max) = (125 c ? 25 c) / (68 c/w) = 1.471w for wqfn-16l 3x3 package the maximum power dissipation depends on the operating ambient temperature for fixed t j(max) and thermal resistance, ja . for the RT9525 package, the derating curve in figure 2 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. figure 2. derating curve for the RT9525 package 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 0 25 50 75 100 125 ambient temperature (c) maximum power dissipation (w) 1 four-layer pcb
RT9525 14 ds9525-01 may 2011 www.richtek.com figure 3. pcb layout guide bat ts bat nc sys sys en2 en1 gnd iseta sysoff vin timer 12 11 10 9 13 14 15 16 1 2 3 4 8 7 6 5 gnd 17 en pgood chg sys gnd c sys c in gnd c timer r iseta gnd r ts c bat batt place c in near the ic to improve performance. gnd should be connected to a strong ground plane for heat sinking and noise protection. the r iseta connection copper area should be minimized and kept far away from noise sources. sys layout considerations the RT9525 is a fully integrated low cost single cell li-ion battery charger ideal for portable applications. careful pcb layout is necessary. for best performance, place all peripheral components as close to the ic as possible. a short connection is highly recommended. the following guidelines should be strictly followed when designing a pcb layout for the RT9525. ` input and output capacitor should be placed close to ic and connected to ground plane. the trace of input in the pcb should be placed far away from the sensitive devices and shielded by the ground. ` the gnd and exposed pad should be connected to a strong ground plane for heat sinking and noise protection. ` the connection of r iseta should be isolated from other noisy traces. a short wire is recommended to prevent emi and noise coupling.
RT9525 15 ds9525-01 may 2011 www.richtek.com richtek technology corporation headquarter 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 fax: (8863)5526611 information that is provided by richtek technology corporation is believed to be accurate and reliable. richtek reserves the ri ght to make any change in circuit design, specification or other related things if necessary without notice at any time. no third party intellectual property inf ringement of the applications should be guaranteed by users when integrating richtek products into any application. no legal responsibility for any said applications i s assumed by richtek. richtek technology corporation taipei office (marketing) 5f, no. 95, minchiuan road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)86672399 fax: (8862)86672377 email: marketing@richtek.com outline dimension a a1 a3 d e 1 d2 e2 l b e see detail a dimensions in millimeters dimensions in inches symbol min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a3 0.175 0.250 0.007 0.010 b 0.180 0.300 0.007 0.012 d 2.950 3.050 0.116 0.120 d2 1.300 1.750 0.051 0.069 e 2.950 3.050 0.116 0.120 e2 1.300 1.750 0.051 0.069 e 0.500 0.020 l 0.350 0.450 0.014 0.018 w-type 16l qfn 3x3 package note : the configuration of the pin #1 identifier is optional, but must be located within the zone indicated. det ail a pin #1 id and tie bar mark options 1 1 2 2

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