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RT9527GQW

Richtek Tech · Battery Management · WDFN-8-EP(2x2)

RT9527GQW from Richtek Tech, in a WDFN-8-EP(2x2). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VIN	power_in	Supply voltage input that can withstand up to 28V (recommended operating range 4.4V to 6V).
2	PGOOD	output	Power good status output, active-low open-drain, asserts low when VIN is in the proper working range (abs max -0.3V to 28V).
3	CHG	output	Charger status output, active-low open-drain, low while charging and high impedance when termination current is reached or on timer fault (abs max -0.3V to 28V).
4	GND	power_in	Ground; shared with the exposed pad, which must be soldered to a large PCB ground plane for maximum power dissipation.
5	ISET	passive	Charge current setting pin; a resistor RISET to GND sets the fast-charge current (ICHG = KCHG/RISET, 10mA to 600mA).
6	TIMER	passive	Safe-charge timer setting pin; a capacitor to GND sets fast-charge fault time tFCHG = 14400 x CTIMER (s, CTIMER in uF).
7	TS	input	Temperature sense input connected to the battery thermistor; charging pauses when the battery is too hot or too cold until it re-enters the valid range (abs max -0.3V to 28V).
8	BAT	power_out	Charge current output to the battery, regulated to 4.2V (4.158V to 4.242V).
9	GND	power_in	Exposed pad, ground; must be soldered to a large PCB ground plane for maximum power dissipation.

Key specifications

Parameter	Value
Manufacturer	Richtek Tech
Package	WDFN-8-EP(2x2)
Category	Power Management (PMIC)
Pins	9

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply Input Voltage (absolute max)	VIN	-0.3		28	V		4
CHG, PGOOD, TS voltage		-0.3		28	V		4
Other pins voltage		-0.3		6	V		4
Power Dissipation	PD			2.19	W	TA = 25°C, WDFN-8L 2x2	4
Lead Temperature				260	°C	Soldering, 10 sec.	4
Junction Temperature	TJ			150	°C		4
Storage Temperature		-65		150	°C		4
ESD HBM				2	kV	HBM	4
Thermal resistance junction to ambient	θJA		45.5		°C/W	WDFN-8L 2x2, JEDEC 51-7 four-layer board, TA = 25°C	4
Thermal resistance junction to case	θJC		11.5		°C/W	WDFN-8L 2x2, at exposed pad	4
Supply Input Voltage (recommended)	VIN	4.4		6	V		4
Junction Temperature Range	TJ	-40		125	°C		4
Ambient Temperature Range	TA	-40		85	°C		4
VIN Under Voltage Lockout Threshold	VUVLO	3.1	3.3	3.5	V	VIN = 0V to 5V	4
VIN − BAT VOS Rising	VOS_H		100	200	mV		4
VIN − BAT VOS Falling	VOS_L	10	50		mV		4
VIN Standby Current	ISTANDBY		1	2	mA	VBAT = 4.5V	4
BAT Sleep Leakage Current	ISLEEP			1	μA	VIN = 0V	4
Battery Voltage Regulation	VREG	4.158	4.2	4.242	V	TJ = 0°C to 85°C	4
Re-Charge Threshold	ΔVREGCHG	60	100	140	mV	Battery Regulation − Recharge Level	4
VIN Charge Setting Range	ICHG	10		600	mA		4
Fast-Charge Current Factor 1	KCHG_F1	510	600	690	AΩ	ICHG_F1 = KCHG_F1 / RISET, ICHG_F1 = 10mA to 50mA	4
Fast-Charge Current Factor 2	KCHG_F2	570	600	630	AΩ	ICHG_F2 = KCHG_F2 / RISET, ICHG_F2 = 50mA to 600mA	4
Pre-Charge Current Factor	KCHG_P	30	60	90	AΩ	ICHG_P = KCHG_P / RISET	5
BAT Pre-Charge Threshold	VPRECH	2.7	2.8	2.9	V	VBAT Falling	5
Termination Current Ratio	ITERMI	5	10	15	%	VBAT > VPREC, ICHG < ITERMI, CHG = L to H	5
Over Voltage Protection	VOVP	6.2	6.5	6.8	V		5
ISET Pin Short Protection	RSHORT	375	500	625	Ω		5
Cold Temperature Fault Threshold Voltage	VCOLD	60	61	62	%VIN	Rising Threshold	5
Hot Temperature Fault Threshold Voltage	VHOT	29	30	31	%VIN	Falling Threshold	5
Pre-Charge Fault Time	tPCHG	1440	1800	2160	s	CTIMER = 1μF (1 / 8 x tFCHG)	5
Fast-Charge Fault Time	tFCHG	11520	14400	17280	s	CTIMER = 1μF	5
VIN Under Voltage Lockout Hysteresis	ΔVUVLO		240		mV	VIN = 5V to 0V	4
VIN Power FET On-Resistance	RDS(ON)		0.8		Ω	IBAT = 450mA	4
Thermal Regulation	TREG		125		°C		5
PGOOD Pull Down Voltage	VPGOOD		200		mV	IPGOOD = 5mA	5
CHG Pull Down Voltage	VCHG		200		mV	ICHG = 5mA	5

CAD (KiCad official)

Symbol: RT9527GQW
Footprint: Package_DFN_QFN:WDFN-8-1EP_2x2mm_P0.5mm_EP0.8x1.2mm
3D model: WDFN-8-EP(2x2), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.75 mm nominal WSON height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
3D model files: rt9527gqw-etched.step / rt9527gqw-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); rt9527gqw.step / rt9527gqw.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Richtek Tech datasheet (19 pp, sha256 e4797cc9f6516a05, retrieved 2026-10-26, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF