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RT9527 ? ds9527-00 may 2012 www.richtek.com 1 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. single cell li-ion battery charger with adjustable charging current for portable applications applications z cellular phones z digital cameras z pdas and smart phone z portable instruments general description the RT9527 is a low cost single-cell li-ion charger for low current charge applications. the RT9527 can be powered up from an ac adapter or usb (universal serial bus) port inputs. the RT9527 enters sleep mode when vin power is removed. the RT9527 optimizes the charging task by using a control algorithm, which includes pre-charge mode, fast-charge mode and constant voltage mode. the charging task is kept in constant voltage mode to hold the battery in a full charge condition. the charge current is adjustable via an external resistor. the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. the RT9527 features 28v maximum rating voltages for vin. other features include under voltage protection and over voltage protection for the ac adapter supply. the RT9527 is available in a wdfn-8l 2x2 package. features z z z z z 28v maximum rating for ac adapter z z z z z internal integrated power fets z z z z z adjustable charging current z z z z z programmable safe charge timer z z z z z ntc thermistor input z z z z z battery reverse protection z z z z z iset pin short protection z z z z z charge status indicator z z z z z ac adapter power good status indicator z z z z z end of charge current is 10% of fast-charge current z z z z z under voltage protection z z z z z over voltage protection z z z z z thermal feedback optimized charge rate z z z z z small thermally enhanced 8-lead wdfn package z z z z z rohs compliant and halogen free marking information simplified application circuit 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. RT9527 package type qw : wdfn-8l 2x2 (w-type) lead plating system g : green (halogen free and pb free) 0sw RT9527 input power pgood chg gnd vin battery bat indicator timer iset 0s : product code w : date code
RT9527 2 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. functional pin description function block diagram pin no. pin name pin function 1 vin supply voltage input. vin can withstand up to 28v input. 2 pgood power good status output. active-low, open-drain output. 3 chg charger status output. active-low, open-drain output. 4, 9 (exposed pad) gnd ground. the exposed pad must be soldered to a large pcb and connected to gnd for maximum power dissipation. 5 iset charge current setting. 6 timer safe-charge timer setting. 7 ts temperature sense input. the ts pin connects to a battery?s thermistor to determine whether the battery is too hot or too cold for charging operation. if the battery?s temperature is out of range, charging is paused until it re-enters the valid range. 8 bat charge current output for battery. sleep mode current set block ovp uvlo base switch well thermal circuit timer cc/cv/tr multi loop controller logic v ref i bias + - + - vcc vin iset bat ts tmier chg pgood gnd too cold too hot 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) wdfn-8l 2x2 vin gnd pgood bat ts timer iset chg 7 6 5 1 2 3 4 8 gnd 9 RT9527 package type qw : wdfn-8l 2x2 (w-type) lead plating system g : green (halogen free and pb free)
RT9527 3 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. operation the RT9527 is a li-ion charger that can support the input voltage range from 4.4v to 6v. it provides a wide fast- charge current setting ranging from 10ma up to 600ma. change current setting the charging current is adjustable via an external resistor between the iset and gnd pin. uvlo if the input voltage (vin ) is lower than the threshold voltage v uvlo ? v uvlo , the charger will stop charging until vin is larger than v uvlo . ovp if the input voltage (vin) is higher than the threshold voltage v ovp , the internal ovp signal will go high and the charger will stop charging until vin is below v ovp ? v ovp . switch well the switch well will choose the highest voltage between vin and bat to prevent the power switch from damage. sleep mode when the voltage difference between vin and bat is under v os_l , the charger will enter sleep mode to save the system power consumption. cc/cv/tr multi loop controller there are constant current loop, constant voltage loop and thermal regulation loop to control the charging current. too hot or too cold the temperature sense input ts pin can be connected a thermistor to determine whether the battery is too hot or too cold for charging operation. if the battery's temperature is out of range, charging is paused until it re-enters the valid range. pgood the pgood is an open-drain output used to indicate the input voltage status. pgood will assert low when vin is in the proper working range. chg the chg pin is an open-drain output. chg will assert low when the charger starts to charge the battery and become high impedance when the termination current is reached. timer the charger contains the safety timer. when the charging time is longer than t pchg in the pre-charge mode or t fchg in the fast-charge mode, time fault happens. then, the charger will be turned off and the chg pin will become high impedance.
RT9527 4 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. absolute maximum ratings (note 1) z supply input v oltage, vin ----------------------------------------------------------------------------------------------- ? 0.3v to 28v z chg, pgood -------------------------------------------------------------------------------------------------------------- ? 0.3v to 28v z other pins ------------------------------------------------------------------------------------------------------------------- ? 0.3v to 6v z power dissipation, p d @ t a = 25 c wdf n-8l 2x2 -------------------------------------------------------------------------------------------------------------- 0.8 33w z package thermal resistance (note 2) wdfn-8l 2x2, ja --------------------------------------------------------------------------------------------------------- 120 c/w wdfn-8l 2x2, jc --------------------------------------------------------------------------------------------------------- 8.2 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 3) hbm (human body model) ---------------------------------------------------------------------------------------------- 2kv mm (ma chine model) ----------------------------------------------------------------------------------------------------- 200v recommended operating conditions (note 4) z supply input voltage, v in ----------------------------------------------------------------------------------------------- 4.4v to 6v z junction temperature range -------------------------------------------------------------------------------------------- ? 40 c to 125 c z ambient temperature range -------------------------------------------------------------------------------------------- ? 40 c to 85 c electrical characteristics (v in = 5v, v bat = 4v, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max unit supply input vin under voltage lockout threshold v uvlo v in = 0v to 5v 3.1 3.3 3.5 v vin under voltage lockout hysteresis v uvlo v in = 5v to 0v -- 240 -- mv vin ? bat vos rising v os_h -- 100 200 mv vin ? bat vos falling v os_l 10 50 -- mv vin standby current i standby v bat = 4.5v -- 1 2 ma bat sleep leakage current i sleep v in = 0v -- -- 1 a voltage regulation battery voltage regulation v reg 0 c to 85 c 4.158 4.2 4.242 v re-charge threshold v regchg battery regulation ? recharge level 60 100 140 mv vin power fet on-resistance r ds(on) i bat = 450ma -- 0.8 -- current regulation vin charge setting range i chg 10 -- 600 ma k chg_f1 i chg_f1 = k chg_f1 / r iset , i chg_f1 = 10ma to 50ma 510 600 690 fast-charge current factor k chg_f2 i chg_f2 = k chg_f2 / r iset , i chg_f2 = 50ma to 600ma 570 600 630 a
RT9527 5 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. parameter symbol test conditions min typ max unit pre-charge current factor k chg_p i chg_p = k chg_p / r iset 30 60 90 a pre-charge bat pre-charge threshold v prech v bat falling 2.7 2.8 2.9 v bat pre-charge threshold hysteresis v prech -- 200 -- mv charge termination termination current ratio i termi v bat > v prec , i chg < i termi , chg = l to h 5 10 15 % protection thermal regulation t reg -- 125 -- c over voltage protection v ov p 6.2 6.5 6.8 v over voltage protect hysteresis v ovp -- 0.2 -- v iset pin short protection r short 375 500 625 ntc cold temperature fault threshold voltage v cold rising threshold 60 61 62 %v in cold temperature fault threshold hysteresis v cold -- 2 -- %v in hot temperature fault threshold voltage v hot falling threshold 29 30 31 %v in hot temperature fault threshold hysteresis v hot -- 2 -- %v in timer pre-charge fault time t pchg c timer = 1 f (1 / 8 x t fchg ) 1440 1800 2160 s fast-charge fault time t fchg c timer = 1 f 11520 14400 17280 s other pgood pull down voltage v pgood i pgood = 5ma -- 200 -- mv chg pull down voltage v chg i chg = 5ma -- 200 -- mv pgood deglitch time t pgood time measured from the edge v in = 0v to 5v in 1 s to pgood = l -- 2 -- ms input over voltage blanking time t ovp -- 50 -- s input over voltage recovery time t ovp_r -- 2 -- ms pre-charge to fast-charge deglitch time t pf -- 25 -- ms fast-charge to pre-charge deglitch time t fp -- 25 -- ms termination deglitch time t termi -- 25 -- ms recharge deglitch time t rechg -- 100 -- ms sleep deglitch time t no-in -- 25 -- ms pack temperature fault detection deglitch time t ts -- 25 -- ms
RT9527 6 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. note 1. stresses beyond those listed ? absolute maximum ratings ? may cause permanent damage to the device. these are stress ratings only, and 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 may affect device reliability. note 2. ja is measured at t a = 25 c on a high effective thermal conductivity four-layer test board per jedec 51-7. jc is measured at the exposed pad of the package. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions.
RT9527 7 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical application circuit pgood ts bat RT9527 vin r t1 1 2 8 c in c out gnd 4, 9 (exposed pad) r ntc r t2 chg 3 r1 r2 timer iset 7 6 5 adapter or usb r iset c timer
RT9527 8 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical operating characteristics time (100ms/div) v in over voltage protection v in (10v/div) i bat (500ma/div) v in = 5v to 15v, v bat = real battery, r iset = 1k v bat (5v/div) v chg (10v/div) v in hot-plug without ntc/battery v in (5v/div) v ts (5v/div) v in = 5v v bat (5v/div) v pgood (5v/div) time (100ms/div) time (100ms/div) v in hot-plug with ntc/battery v in (5v/div) v ts (5v/div) v bat (5v/div) v pgood (5v/div) i bat (500ma/div) v in = 5v, v bat = real battery, r iset = 1k time (100ms/div) v in hot-plug with ntc/without battery v in (5v/div) v ts (5v/div) v in = 5v v bat (5v/div) v pgood (5v/div) time (500ms/div) charge on/off control from vin v in (5v/div) i bat (500ma/div) v in = 5v, v bat = real battery, r iset = 1k v bat (2v/div) v chg (5v/div) time (25ms/div) ts inserted/removed v bat (5v/div) i bat (500ma/div) v in = 5v, v bat = real battery, r iset = 1k v ts (2v/div) v chg (1v/div)
RT9527 9 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. pre-charge current vs. battery voltage 0 10 20 30 40 50 60 70 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 battery voltage (v) pre-charge current (ma ) v in = 5v, r iset = 1k fast-charge current vs. battery voltage 400 450 500 550 600 650 700 750 800 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 battery voltage (v) fast-charge current (ma) 1 v in = 5v, r iset = 1k ovp threshold voltage vs. temperature 6.25 6.30 6.35 6.40 6.45 6.50 6.55 6.60 6.65 -50-250 255075100125 temperature (c) ovp voltage (v) v in = 5v, v bat = 3.7v rising falling i chg thermal regulation vs. temperature 0 3 6 9 12 -50 -25 0 25 50 75 100 125 temperature (c) i chg thermal regulation (ma) 1 v in = 5v, v bat = 3.7v, i chg = 10ma battery regulation voltage vs. temperature 4.100 4.125 4.150 4.175 4.200 4.225 4.250 4.275 4.300 0 102030405060708090 temperature (c) battery voltage (v) v in = 5v i chg thermal regulation vs. temperature 0 100 200 300 400 500 600 700 -50 -25 0 25 50 75 100 125 temperature (c) i chg thermal regulation (ma) 1 v in = 5v, v bat = 3.7v, i chg = 600ma
RT9527 10 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. charge state chg output charging charging suspended by thermal loop low (for first charger cyc le) safety timers expired high impedance ts fault low (for first charger cyc le) charging done recharging after termination no valid input power high impedance iset pin short protection after vin power plugs in, RT9527 will detect that iset pin is short to ground or not. if riset is smaller than r short , RT9527 regard that iset pin is short to ground. then, RT9527 will disable charge function until vin power reset. if riset is larger than r short , RT9527 will charge. if RT9527 begins charge status and iset pin is short to ground, thermal regulation will work to limit junction temperature around 125 c. pgood indicator this open-drain output pin is used to indicate the input voltage status. pgood output asserts low when 1. v in > v uvlo 2. (v in ? v bat ) > v os_h 3. v in < v ovp it can be used to drive an led or communicate to the host processor. note that ? low ? indicates the open- drain transistor is turned on and the led is bright. charge termination when the charge current is lower than the charge termination current ratio (10% = i chg / i chg_f ) for v bat > 4.1v and the time is larger than the deglitch time (25ms), chg transits from low to high. chg will be latche d high unless the power is re-toggled. application information the RT9527 is a fully integrated low cost single-cell li- ion battery charger ideal for portable applications. the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate at all ambient temperatures. the RT9527 features 20v maximum rating voltages for vin. other features include under voltage protection and over voltage protection for ac adapter supply, as well as a charging time monitor. pre-charge mode when the output voltage becomes lower than 2.8v, the charging current reduces to 10% of the setting current to protect the battery life time as shown below : i chg_p = k chg_p / r iset where k chg_p is the pre-charge current factor. fast-charge mode when the output voltage becomes higher than 3v, the charging current will be equal to the setting current which is determined by r iset . i chg_f = k chg_fx / r iset where k chg_fx is the fast-charge current factor. constant voltage mode as the output voltage is near 4.2v, the charging current will be reduced to maintain the output voltage. the charger remains active and maintains the output voltage at 4.2v in order to keep the battery in a full charge state. recharge mode when the chip is in charge termination mode, the charging current goes down to zero and the battery voltage drops to 4.1v. after a deglitch time of 100ms (typ.), the battery begins recharging. however, when recharge happens, the indicator chg remains in logic high. chg indicator the chg pin is an open-drain output. chg will assert low when the charger starts to charge the battery and become high impedance when the charge termination current is reached. the chg signal is interfaced either with a microprocessor gpio or an led for indication.
RT9527 11 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. () ? + tc th t2 tc th th t2 t1 th t2 2.5r r r = r3.5r 7r r r = 3r r battery connect reverse if battery is connected reversely, it causes that the voltage of bat pin is negative. RT9527 will disable charger function until battery voltage is normal. temperature regulation in order to maximize charge rate, the RT9527 features a junction temperature regulation loop. if the power dissipation of the ic results in junction temperature greater than the thermal regulation threshold (125 c), the RT9527 will cut back on the charge current and disconnect the battery in order to maintain thermal regulation at around 125 c. this operation continues until the junction temperature falls below the thermal regulation threshold (125 c) by the hysteresis level. this feature prevents the maximum power dissipation from exceeding typical design conditions. sleep mode the RT9527 enters sleep mode if both the ac and usb ports are removed from the input. this feature prevents draining the battery during the absence of an input supply. battery pack temperature monitoring the RT9527 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 danger 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. time fault the fast-charge fault time is 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 the c timer unit is in f. when time fault happens, the charger cycle will be turned off and the chg pin will become high impedance. 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, the maximum junction temperature is 125 c. the junction to ambient thermal resistance, ja , is layout dependent. for wdfn-8l 2x2 package, the thermal resistance, ja , is 120 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) / (120 c/w) = 0.833w for wdfn-8l 2x2 package the maximum power dissipation depends on the operating ambient temperature for fixed t j(max) and thermal resistance, ja . the derating curve in figure 1 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. + - + - ts too cold too hot ntc_fault vin r t1 r t2 r ntc
RT9527 12 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. figure 1. derating curve of maximum power dissipation 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0 255075100125 ambient temperature (c) maximum power dissipation (w) 1 four-layer pcb layout considerations the RT9527 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 must be strictly followed when designing a pcb layout for the RT9527. ` 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 iset should be isolated from other noisy traces. a short wire is recommended to prevent emi and noise coupling. figure 2. pcb layout guide the r iset connection copper area should be minimized and kept far away from noise sources. place c in near the ic to improve performance. connect the exposed pad to a ground plane. gnd should be connected to a strong ground plane for heat sinking and noise protection. vin gnd pgood bat ts timer iset chg 7 6 5 1 2 3 4 8 gnd 9 vin c timer r iset c out r t1 r t2 r1 r2 c in gnd gnd
RT9527 13 ds9527-00 may 2012 www.richtek.com ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. figure 2. operation state diagram for charging any state v in > v ovp or v in < v uvlo power off state pfet = off v ovp > v in > v uvlo standby state pfet = off v in C v bat > v os sleep state pfet = off no v bat > 3v yes yes yes yes time < tfchg no no v bat ~4.2v yes no i bat < iterm no time >ttermi yes no yes v bat < v reg - 0.1v no no power re-plug reset time counter no yes no yes yes operation state diagram for charger function (RT9527) fast-charge mode chg = l charge termination v bat = 4.2v ichg = 0a chg = h (latch) pre-chg state i chg_p = 0.1 x i chg_f chg = l cv mode chg = l note1 : if termination happens, chg will be latched h. (v in > v ovp or v in < v uvlo or v in C v bat < v os_l ) will release chg latch h state. but v bat < v reg - 0.1 can not release chg latch h state. note2 : if time out happens, chg will become high impedance. (v in > v ovp or v in < v uvlo or v in C v bat < v os_l ) will release time out state v in C v bat > v os sleep state pfet = off no v bat > 3v yes time < tpchg yes no no v bat ~4.2v yes no i bat < iterm no time > ttermi yes no yes v bat < v reg - 0.1v yes no power re-plug reset time counter no yes no yes yes time < tpchg time < tfchg cv mode chg = h (latch) charge termination v bat = 4.2v ichg = 0a chg = h (latch) fast-charge mode chg = h (latch) pre-chg state i chg_p = 0.1 x i chg_f chg = l fault chg = high impedance pfet = off fault chg = high impedance pfet = off
RT9527 14 ds9527-00 may 2012 www.richtek.com richtek technology corporation 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 richtek products are sold by description only. richtek reserves the right to change the circuitry and/or specifications without notice at any time. customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a richtek product. information furnish ed by richtek is believed to be accurate and reliable. however, no responsibility is assumed by richtek or its subsidiaries for its use; nor for any infringeme nts of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of r ichtek or its subsidiaries. outline dimension w-type 8l dfn 2x2 package 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 0.200 0.300 0.008 0.012 d 1.950 2.050 0.077 0.081 d2 1.000 1.250 0.039 0.049 e 1.950 2.050 0.077 0.081 e2 0.400 0.650 0.016 0.026 e 0.500 0.020 l 0.300 0.400 0.012 0.016 1 1 2 2 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 d 1 e a3 a a1 d2 e2 l b e see detail a

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