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RT9536H ? ds9536h-00 june 2015 www.richtek.com p1 copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. ? linear single cell li-ion battery charger ic for portable applications general description the RT9536H is a fully integrated single cell li-ion battery charger ic ideal for portable applications. the RT9536H optimizes the charging task by using a control algorithm including pre-charge mode, fast charge mode and constant voltage mode. the input voltage range of the vin pin can be as high as 28v. when the input voltage exceeds the ovp threshold, it will turn off the charging mosfet to avoid overheating of the chip. in RT9536H, the maximum charging current can be programmed with an external resistor. for usb application, the user can set the current to 100ma/500ma through the en/set pin. for the factory mode, the RT9536H can allow 4.25v or 4.4v/2.3a power pass through to support system operation. it also provides a 50ma ldo to support the power of peripheral circuit. the internal thermal feedback circuit regulates the die temperature to optimize the charge rate for all ambient temperatures. the RT9536H provides protection functions such as under voltage protection, over voltage protection for vin supply and thermal protection for battery temperature. the RT9536H is available in a wdfn-10l 3x2 package to achieve optimized solution for pcb space and thermal considerations. features ? ? ? ? ? 28v maximum rating for dc adapter ? ? ? ? ? internal integrated power mosfets ? ? ? ? ? support 4.25v or 4.4v/2.3a factory mode ? ? ? ? ? 50ma low dropout voltage regulator ? ? ? ? ? status pin indicator ? ? ? ? ? programmed charging current ? ? ? ? ? under voltage lockout ? ? ? ? ? over voltage protection ? ? ? ? ? thermal feedback optimized charge rate ? ? ? ? ? rohs compliant and halogen free applications ? cellular phones ? digital cameras ? pdas and smart phones ? portable instruments marking information simplified application circuit 06= : product code ymdnn : date code 06=ym dnn vin gnd RT9536H pgb batt chgsb ldo c out + c in adapter or usb batt batt iset r iset ieoc r ieoc en/set
RT9536H 2 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. function block diagram functional pin description pin no. pin name pin function 1 vin power input. 2 iset charging current setting. 3, 7, 11 (exposed pad) gnd ground. the exposed pad must be soldered to a large pcb and connected to gnd for maximum power dissipation. 4 ldo ldo output (4.9v). this pin provides 50ma output current . 5 ieoc end-of-charge current setting. the i eoc is from 5% to 5 o % ichg-fast which is programmed by the iset pin. 6 en/set enable and operation mode and v out regulation voltage setting. 8 chgsb indicator output for charging status. 9 pgb indicator output for power status. 10 batt battery charge current output. 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 wdfn-10l 3x2 (top view) iset ieoc gnd pgb chgsb gnd en/set ldo 8 7 6 2 3 4 5 9 gnd 11 vin batt 1 10 cc/cv/tr multi loop controller logic ldo current set block current set block 200k status switch well sleep mode i eoc set block ovp uvlo base v ref v dd i bias vin ieoc batt chgsb pgb iset en/set ldo gnd RT9536H package type qw : wdfn-10l 3x2 (w-type) lead plating system g : green (halogen free and pb free)
RT9536H 3 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. operation the RT9536H is designed for single cell li-ion battery charger in portable applications. base circuit the base circuit provides the internal power for vdd, v ref reference voltage and bias current. power switch with switch well circuits the main power switch between vin and batt is designed to control the charge current for battery. the switch well is designed to avoid the reverse current from battery to input power. sleep mode when the charger is only connected to battery with no input power, the charger will enter sleep mode and the leakage current from battery to the charger will be less than 10 a for low power consumption current set block the charge current is adjustable from the iset pin with an external resistor between the iset and gnd. the end- of-charge current is also adjustable by an external resistor connected from the ieoc pin to gnd. if the charging current is less than eoc current, the chgsb pin will be pulled high. protection the protection circuits include ovp, uvlo and otp. when the protection circuit is triggered, the main power switch will be turned of to protect the charging system. multi-loop controller the multi-loop controller controls the operation during the charging process. the controller will make sure the battery is well charged in a suitable current, voltage, and die temperature. status indicator the chgsb and pgb pin indicate the charger and power condition. during the charging process, the chgsb pin is pulled low. when the charger is under charge done condition or abnormal condition, the chgsb will be high impedance. the pgb pin indicates the input power status at vin pin. when the input power is normal, the pgb pin is pulled low. operation mode the RT9536H provides programmable output current mode setting including usb100, usb500 and factory mode. the operation mode is programmable through the input pulse number at en/set pin. under the factory mode, besides the en/set is also used to set regulation to be 4.25v or 4.4v. output current is up to 2.3a. ldo the RT9536H provides a ldo regulator to support the peripheral circuits. the output voltage is regulated to 4.9v and the maximum output current is 50ma.
RT9536H 4 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. electrical characteristics recommended operating conditions (note 3) ? supply input voltage, vin ----------------------------------------------------------------------------------------------- 4.3v to 5.5v ? junction temperature range -------------------------------------------------------------------------------------------- ? 40 c to 125 c ? ambient temperature range -------------------------------------------------------------------------------------------- ? 20 c to 85 c absolute maximum ratings (note 1) ? supply input v oltage, vin ----------------------------------------------------------------------------------------------- ? 0.3v to 28v ? other pins ------------------------------------------------------------------------------------------------------------------- ? 0.3v to 6v ? power dissipation, p d @ t a = 25 c wdfn-10l 3x2 ------------------------------------------------------------------------------------------------------------- 2.27w ? package thermal resistance (note 2) wdfn-10l 3x2, ja ------------------------------------------------------------------------------------------------------- 44 c/w wdfn-10l 3x2, jc ------------------------------------------------------------------------------------------------------- 11 c/w ? lead temperature (soldering, 10 se c.) ------------------------------------------------------------------------------- 260 c ? junction temperature ----------------------------------------------------------------------------------------------------- 150 c ? storage temperature range -------------------------------------------------------------------------------------------- ? 65 c to 150 c (v in = 5v, v batt = 4v, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max unit vin por rising threshold voltage v por 3.15 3.3 3.45 v vin por threshold voltage hysteresis -- 200 300 mv vin ovp threshold voltage v ovp 6.7 6.9 7.1 v vin ovp threshold voltage hysteresis -- 200 300 mv vin ?? vout vos rising -- 75 150 mv vin ? vout vos falling 18 32 -- mv vin standby current v batt = 4.5v, en/set = high -- 250 300 ? a vin supply current v batt = 4.5v, en/set = low -- 1 2 ma vout sleep leakage current -- 1 10 ? a vout regulation v cv 0 ? c to 85 ? c, i load = 0ma 4.186 4.25 4.313 v 4.356 4.4 4.444 thermal regulation -- 125 -- ? c otp -- 155 -- ? c otp hysteresis -- 20 -- ? c pgb/chgsb sink current 20 -- -- ma pre-charge threshold v out rising; v cv = 4.25v 2.4 2.5 2.6 v v out rising; v cv = 4.4v 2.5 2.6 2.7 fast-charge to pre-charge deglitch time -- 25 -- ms
RT9536H 5 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 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. the device is not guaranteed to function outside its operating conditions. parameter symbol test conditions min typ max unit pre-charge current i prechg usb100 mode 90 95 100 ma usb500 mode or iset mode, ratio of fast-charge current 15 20 25 % end of charge current (eoc) -- r eoc / k eoc -- % ieoc setting current i eoc 70 75 80 ? a ieoc setting k eoc 180 200 220 ? /% vin power fet r ds(on) i out = 1a -- 280 512 mv iset set voltage v iset -- 1.5 -- v iset short protect threshold 320 -- 460 ? iset short protect deglitch time -- 1.5 -- ms iset short protect maximum current -- 2 -- a vin charge current i chrg as iset mode, r iset = 530 0.9 1 1.1 a as usb100 mode 90 95 100 ma as usb500 mode 380 395 415 ma en/set pull low resistor -- 200 -- k ? en/set voltage logic-high v ih 1.4 -- -- v logic-low v il -- -- 0.4 ldo on-resistance r ds(on) 3 6 ? ldo output voltage v ldo 4.75 4.9 5.05 v ldo maximum output current 60 120 180 ma factory mode v out v cv = 4.25v 4.165 4.25 4.335 v v cv = 4.4v 4.312 4.4 4.488 factory mode maximum output current 2.3 -- -- a en/set off time timer to disable chip 2 -- -- ms en/set lock time timer to lock pulse count 1.5 -- -- ms en/set duration logic-high 100 -- 700 ? s logic-low 100 -- 700 en/set set time timer to set v cv = 4.4v 750 -- 1000 ? s ? ?
RT9536H 6 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical application circuit vin gnd RT9536H pgb 8 3, 7, 11 (exposed pad) 10 1 9 batt chgsb ldo 4 c out + c in adapter or usb batt batt iset 2 r iset ieoc 5 r ieoc en/set 6
RT9536H 7 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. ldo voltage vs. temperature 4.85 4.87 4.89 4.91 4.93 4.95 -50 -25 0 25 50 75 100 125 temperature (c) ldo voltage (v) vout sleep leakage current vs. battery voltage 0 4 8 12 16 20 1.3 1.7 2.1 2.5 2.9 3.3 3.7 4.1 4.5 battery voltage (v) vout sleep leakage current (a) 1 input ovp threshold vs. temperature 6.70 6.72 6.74 6.76 6.78 6.80 6.82 6.84 -50 -25 0 25 50 75 100 125 temperature (c) input ovp threshold (v) typical operating characteristics v in = 5.5v, i ldo = 50ma ldo output voltage vs. output current 4.85 4.87 4.89 4.91 4.93 4.95 0 20406080100 output current (ma) ldo output voltage (v) v in = 5.5v iset mode charge current vs. input voltage 300 375 450 525 600 675 750 825 900 4.5 4.9 5.3 5.7 6.1 6.5 input voltage (v) charge current (ma ) r = 680 r = 1.2k v batt = 3.8v usb 500 mode charge current vs. input voltage 365 375 385 395 405 415 4.5 4.9 5.3 5.7 6.1 6.5 input voltage (v) charge current (ma ) v batt = 3.8v
RT9536H 8 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. en/set shut-down time (1ms/div) v in = 5v en/seb (1v/div) vldo (2v/div) i charger (500ma/div) chgs (2v/div) power on time (10ms/div) pgb (2v/div) v in (5v/div) v batt = 3.8v, r iset = 680 , en/seb = low chgsb (2v/div) i charger (500ma/div) vin (5v/div) vbatt (5v/div) en/set (2v/div) i charger (500ma/div) charger current--usb500 mode to iset mode v in = 5v, v batt = 3.8v, r iset = 680 time (1ms/div) charger current--usb500 mode to usb100 mode time (1ms/div) v in = 5v, v batt = 3.8v, r iset = 680 vin (5v/div) vbatt (5v/div) en/set (2v/div) i charger (500ma/div) usb 100 mode charge current vs. input voltage 85 90 95 100 4.5 4.9 5.3 5.7 6.1 6.5 input voltage (v) charge current (ma ) v batt = 3.8v iset voltage v s. input voltage 1.47 1.48 1.49 1.50 1.51 1.52 1.53 4.2 4.72 5.24 5.76 6.28 6.8 input voltage (v) iset voltage (v) r iset = 1.2k , v batt = 3.8v
RT9536H 9 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. ldo load transient response time (250 s/div) v in = 5v, v batt = 3.8v, i ldo = 5ma to 50ma vldo _ac (100mv/div) i ldo (500ma/div) factory mode time (50 s/div) v in = 5v, c out = 44 f, i out = 10 to 2.3 vin (5v/div) vbatt (200mv/div) en/set (1v/div) i out (1a/div)
RT9536H 10 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. application information description the RT9536H is a fully integrated low cost single-cell li- ion battery charger ic with a constant current mode (cc mode) or a constant voltage mode (cv mode). the charge current is programmable to usb100, usb500 or iset mode and the cv mode voltage is fixed at 4.25v/4.4v. the pre-charge threshold is fixed at 2.5v/2.64v. if the battery voltage is below the pre-charge threshold, the RT9536H charges the battery with a trickle current until the battery voltage rises above the pre-charge threshold. the RT9536H is capable of being powered up from ac adapter and usb (universal serial bus) port inputs. moreover, the RT9536H include a linear regulator (ldo 4.9v, 50ma) for supplying low power external circuitry. acin over voltage protection the input voltage is monitored by the internal comparator and the input over voltage protection threshold is set to 6.9v. however, input voltage over 28v will still cause damage to the RT9536H. when the input voltage exceeds the threshold, the comparator outputs a logic signal to turn off the power p-mosfet to prevent the high input voltage from damaging the electronics in the handheld system. when the input over voltage condition is removed, the comparator re-enables the output by running through the soft-start. charger enable and mode setting en/set is used to enable or disable the charger as well as to select the charge current limit. drive the en pin to low or leave it floating to enable the charger. the en/set pin has a 200k internal pull down resistor. so, when left floating, the input is equivalent to logic low. drive this pin to high to disable the charger. after the en/set pin pulls low for 50 s, the RT9536H enters the usb500 mode and wait for the setting current signal. en/set can be used to program the charge current during this cycle. the RT9536H will change its charge current by sending different pulse to en/set pin. if no signal is sent to en/set, the RT9536H will remain in usb500 mode. a correct period of time for high pulse is between 100 s and 700 s and the period of pulse to pulse must be between 100 s and 700 s to be properly read. once en/set is held low for 1.5ms, the number of pulses is locked and sent to the control logic and then the mode changes. after the setting of charging current is completed, sending the pulse can set cv mode voltage to be 4.4v. the RT9536H needs to be restarted to reset the charge current. once the en/ set input is held high for more than 2ms, the RT9536H is disabled. figure 1 (a). cv is 4.25v a. usb500 mode with cv = 4.25v b. iset mode with cv = 4.25v c. usb100 mode with cv = 4.25v d. ptm mode with cv = 4.25v no pulse to set usb500 mode en/set en/set four pulses to set usb500 mode t high t low one pulse to set iset mode en/set t high en/set two pulses to set usb100 mode t high t low en/set three pulses to set ptm mode t high t low 100 s < t high, t low < 700 s
RT9536H 11 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. figure 1 (b). cv is 4.4v table 1. pulse counting map for en/set interface pulses charge condition mode control 0 usb500 mode charge current limit 1 iset mode charge current limit 2 usb100 mode charge current limit 3 factory mode enabled ? 4 usb500 mode charge current limit e. usb500 mode with cv = 4.4v f. iset mode with cv = 4.4v g. usb100 mode with cv = 4.4v h. ptm mode with cv = 4.4v four pulses to set usb500 mode besides, wait the time, t wait and send a pulse of t cv_set width for cv = 4.4v t wait t cv_set en/set t high t low one pulse to set iset mode besides, wait the time, t wait and send a pulse of t cv_set width for cv = 4.4v en/set t cv_set t wait t high two pulses to set usb100 mode besides, wait the time, t wait and send a pulse of t cv_set width for cv = 4.4v en/set t cv_set t wait t high three pulses to set ptm mode besides, wait the time, t wait and send a pulse of t cv_set width for cv = 4.4v en/set t wait t cv_set t high t low 100 s < t high, t low < 700 s, 1.5ms < t wait 750 s < t cv_set < 1ms
RT9536H 12 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. battery pre-charge current during a charge cycle, if the battery voltage is below the pre-charge threshold, the RT9536H enters the pre-charge mode. this feature revives deeply discharged cells and protects battery. under usb100 mode, the pre-charge current is internally set to 95ma. when the RT9536H is under usb500 and iset mode, the pre-charge current is 20% of fast-charge current set by external resistor r iset . isef charge isef iset k i = ; k = 530 r usb500 and usb100 mode the fast-charge current is 95ma in usb100 mode and 395ma in usb500 mode. note that if the fast-charge current set by external resistor is smaller than that in usb500 mode (395ma), the RT9536H charges the battery in iset mode. battery voltage regulation (cv mode) the battery voltage regulation feedback is through the batt pin. the RT9536H monitors the battery voltage between batt and gnd pins. when the battery voltage closes in on the battery regulation voltage threshold, the voltage regulation phase begins and the charging current begins to taper down. when the charging current falls below the programmed end-of-charge current threshold, the chgsb pin goes high to indicate the termination of charge cycle. figure 2 figure 3 battery charge profile the RT9536H charges a li-ion battery with a constant current (cc) or a constant voltage (cv). the constant current is decided by the operation mode of usb100, usb500 or iset mode. the constant current is set with the external resistor r iset and the constant voltage is fixed at 4.25v/4.4v . if the battery voltage is below the pre-charge threshold, the RT9536H charges the battery with a trickle current until the battery voltage rises above the trickle charge threshold. when the battery voltage reaches 4.25v/4.4v , the charger enters cv mode and regulates the battery voltage at 4.25v/4.4v to fully charge the battery without the risk of over charging battery fast-charge current iset mode the RT9536H offers iset pin to program the charge current. the resistor r iset is connected to iset and gnd. the parameter k iset is specified in the specification table. time pre-charge mode constant current mode constant voltage mode recharge phase precharge threshold 4.25v/4.4v battery regulation voltage threshold battery charge current programmed charge current battery full chg_s pull high 0 200 400 600 800 1000 1200 1400 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 r set (k ) battery charge current (ma) 1 r set (k )
RT9536H 13 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. condition chgsb pgb input ovp off off input uvlo off off charge (cc mode and cv mode) on on charge done (ifull) off on pgb deglitches time condition en/set is high en/set is low entering ovp (v in = 5.5v ? 10v) 0 100 ? s leaving ovp (v in = 10v ? 5.5v) 500 ? s 450 ? s entering sleep (v in = 5.5v ? 3.6v) 0 32ms leaving sleep (v in = 3.6v ? 5.5v) 500 ? s 500 ? s entering uvlo (v in = 5.5v ? 2.5v) 0 0 leaving uvlo (v in = 2.5v ? 5.5v) 230 ? s 230 ? s table 2 sleep mode the RT9536H enters sleep mode if the power is removed from the input. this feature prevents draining the battery during the absence of input supply. temperature regulation and thermal protection in order to maximize charge rate, the RT9536H features a junction temperature regulation loop. if the power dissipation of the ic results in a junction temperature greater than the thermal regulation threshold (125 c), the RT9536H limits the charge current in order to maintain a junction temperature around the thermal regulation threshold (125 c). the RT9536H monitors the junction temperature, t j , of the die and disconnects the battery from the input if t j exceeds 125 c. this operation continues until junction temperature falls below thermal regulation threshold (125 c) by the hysteresis level. this feature prevents maximum power dissipation from exceeding typical design conditions. eoc eoc eoc eoc r i (%) = ; k = 200 k the current threshold of ieoc (%) is defined as the percentage of fast-charge current set by r iset . after the chgsb pin is pulled high, the RT9536H still monitors the battery voltage. charge current is resumed when the battery voltage goes to lower than the battery regulation voltage threshold. factory mode the RT9536H provides factory mode for supplies up to 2.3a for powering external loads with no battery installed and batt is regulated to 4.25v. the factory mode allows the user to supply system power with no battery connected. in factory mode, thermal regulation is disabled but thermal protection (155 c) is still active. when using currents greater than 1.5a in factory mode, the user must limit the duty cycle at the maximum current to 20% with a maximum period of 10ms. ldo the RT9536H integrates one low dropout linear regulator (ldo) that supplies up to 50ma. the ldo is active whenever the input voltage is between por threshold and ovp threshold. it is not affected by the en/set input. note that the ldo current is independence and not monitored by the charge current limit. charge status outputs (chgsb and pgb) the open-drain chgsb and pgb outputs indicate various charger operations as shown in the following table. these status pins can be used to drive leds or communicate to the host processor. note that on indicates the open-drain transistor is turned on and led is bright. the end-of-charge current threshold is set by the ieoc pin. the resistor r eoc is connected to ieoc and gnd. the parameters k eoc and ieoc are specified in the specification table.
RT9536H 14 ds9536h-00 june 2015 www.richtek.com ? copyright 2015 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. selecting the input and output capacitors in most applications, all that is needed is a high-frequency decoupling capacitor on the input. a 1 f ceramic capacitor, placed in close proximity to input to gnd, works well. in some applications depending on the power supply characteristics and cable length, it may be necessary to add an additional 10 f ceramic capacitor to the input. the RT9536H requires a small output capacitor for loop stability. a typical 1 f ceramic capacitor placed between the batt pin and gnd is sufficient. thermal considerations for continuous operation, do not exceed absolute maximum operation junction temperature. the maximum power dissipation depends on 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 operation 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-10l 3x2 package, the thermal resistance, ja , is 44 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) / (44 c/w) = 2.27w for wdfn-10l 3x2 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 4 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. figure 4. derating curve of maximum power dissipation 0.0 0.5 1.0 1.5 2.0 2.5 0 25 50 75 100 125 ambient temperature (c) maximum power dissipation (w) 1 four-layer pcb layout consideration the RT9536H is a fully integrated low cost single-cell li- ion battery charger ic 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 RT9536H. ? input capacitor should be placed close to the ic and connected to ground plane. the trace of input in the pcb should be placed far away from the sensitive devices or shielded by the ground. ? the gnd should be connected to a strong ground plane for heat sinking and noise protection. ? the connection of r iset and r ieoc should be isolated from other noisy traces. the short wire is recommended to prevent emi and noise coupling. ? output capacitor should be placed close to the ic and connected to ground plane to reduce noise coupling. figure 5. layout guide iset ieoc gnd pgb chgsb gnd en/set ldo 8 7 6 2 3 4 5 9 gnd 11 vin batt 1 10 c out c in r iset r ieoc gnd the capacitor should be placed close to ic pin and connected to ground plane. the connection of resistor should be isolated from other noisy traces. short wire is recommended to prevent emi and noise coupling. the gnd should be connected to a strong ground plane for heat sinking and noise protection.
RT9536H 15 ds9536h-00 june 2015 www.richtek.com richtek technology corporation 14f, no. 8, tai yuen 1 st 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 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 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 2.900 3.100 0.114 0.122 d2 2.450 2.550 0.096 0.100 e 1.900 2.100 0.075 0.083 e2 0.750 0.850 0.030 0.033 e 0.500 0.020 l 0.250 0.350 0.010 0.014 w-type 10l dfn 3x2 package

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