BQ7790400PWR from Texas Instruments, in a TSSOP-20. 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	VDD	power_in	Supply voltage pin for the device.
2	AVDD	power_out	Analog supply pin that should only be connected to a capacitor.
3	VC5	input	Cell voltage sense input; pin 3 must be connected to pin 4 on the BQ77904 device.
4	VC4	input	Cell voltage sense input.
5	VC3	input	Cell voltage sense input.
6	VC2	input	Cell voltage sense input.
7	VC1	input	Cell voltage sense input.
8	AVSS	power_in	Analog ground.
9	SRP	input	Current sense input connecting to the battery side of the sense resistor.
10	SRN	input	Current sense input connecting to the PACK- side of the sense resistor.
11	DSG	output	DSG FET driver output.
12	CHGU	output	CHG FET signal output for the upper device of a stack; it feeds the CHG signal to the CTRC pin of the lower device.
13	CHG	output	CHG FET driver output, used on a single device or on the bottom device of a stack configuration.
14	LD	input	PACK- load removal detection input.
15	TS	input	Thermistor measurement input; connect a 10-kΩ resistor to AVSS if the function is not used.
16	VTB	output	Thermistor bias output.
17	CCFG	input	Cell in series-configuration input.
18	CTRC	input	CHG and DSG override input.
19	CTRD	input	CHG and DSG override input.
20	DVSS	power_in	Digital ground.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSSOP-20
Category	Power Supply Chip
Pins	20

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Shutdown threshold (VDD falling)	V(SHUT)	2		3.25	V	VDD falling, 6 to 0 V	7
AVDD voltage	V(AVDD)	2.1	2.5	3.25	V	C(VDD) = 1 µF	7
NORMAL mode current (bq77904/bq77905)	ICC		6	9	µA	Cell1 through Cell5 = 4 V, VDD = 20 V (bq77905)	7
Fault condition current	I(CFAULT)	8		12	µA	State comparator on	7
SHUTDOWN mode current	IOFF			0.5	µA	VDD < VSHUT	7
Input leakage current at VCx pins	ILKG(OW_DIS)	-100	0	100	nA	All cell voltages = 4 V, Open-wire disable configuration	7
Overvoltage programmable threshold range	VOV	3000		4575	mV		7
Undervoltage programmable threshold range	VUV	1200		3000	mV		7
OV, UV detection accuracy	V(VA)	-10		10	mV	TA = 25°C, OV detection accuracy	7
OV, UV detection accuracy	V(VA)	-18		18	mV	TA = 25°C, UV detection accuracy	7
OV, UV detection accuracy	V(VA)	-28		26	mV	TA = 0 to 60°C	7
OV, UV detection accuracy	V(VA)	-40		40	mV	TA = -40 to 85°C	7
OV hysteresis programmable threshold range	VHYS(OV)	0		400	mV		7
UV hysteresis programmable threshold range	VHYS(UV)	200		800	mV		7
Overtemperature in discharge programmable threshold (OTD)	VOTD	17.36	18.22	19.51	%VTB	Threshold for 70°C	7
Overtemperature in discharge recovery (OTD)	VOTD(REC)	22.12	23.2	24.24	%VTB	Recovery threshold at 60°C for when VOTD is at 70°C	8
Overtemperature in charge programmable threshold (OTC)	VOTC	29.15	29.38	31.45	%VTB	Threshold for 50°C	8
Overtemperature in charge recovery (OTC)	VOTC(REC)	36.18	36.82	38.47	%VTB	Recovery threshold at 40°C when VOTD is at 50°C	8
Undertemperature in discharge programmable threshold (UTD)	VUTD	86.41	87.14	89.72	%VTB	Threshold for -20°C	8
Undertemperature in discharge recovery (UTD)	VUTD(REC)	80.04	80.94	83.1	%VTB	Recovery threshold at -10°C when VUTD is at -20°C	8
Undertemperature in charge programmable threshold (UTC)	VUTC	75.06	77.22	78.32	%VTB	Threshold for -5°C	8
Undertemperature in charge recovery (UTC)	VUTC(REC)	68.8	69.73	71.71	%VTB	Recovery threshold at 5°C when VUTC is at -5°C	8
Overcurrent discharge 1 programmable threshold range	VOCD1	-85		-10	mV	(VSRP, VSRN)	8
Overcurrent discharge 2 programmable threshold range	VOCD2	-170		-20	mV	(VSRP, VSRN)	8
Short circuit discharge programmable threshold range	VSCD	-340		-40	mV	(VSRP, VSRN)	8
OCD1 detection accuracy at lower thresholds	VCCAL	-30		30	%	VOCD1 > -20 mV	8
OCD1, OCD2, SCD detection accuracy	VCCAH	-20		20	%	VOCD1 ≤ -20 mV; all OCD2 and SCD threshold ranges	8
CHG/CHGU/DSG on voltage	V(FETON)	11	12	14	V	VDD ≥ 12 V, CL = 10 nF	8
CHGU/DSG off resistance	R(DSGOFF)	10		16	Ω	CHGU/DSG off and pin held at 2 V	8
Overvoltage detection delay time (2-s delay option)	tOVn_DELAY	1.8	2	2.7	s	2-s delay option	10
Undervoltage detection delay time (2-s delay option)	tUVn_DELAY	1.8	2	2.7	s	2-s delay option	10
Overtemperature charge detection delay time	tOTC_DELAY	3.6	4.5	5.3	s		10
Undertemperature charge detection delay time	tUTC_DELAY	3.6	4.5	5.3	s		10
Overtemperature discharge detection delay time	tOTD_DELAY	3.6	4.5	5.3	s		10
Undertemperature discharge detection delay time	tUTD_DELAY	3.6	4.5	5.3	s		10
Overcurrent 1 detection delay time (1420-ms delay option)	tOCD1_DELAY	1290	1420	1620	ms	1420-ms delay option	10
Overcurrent 2 detection delay time (350-ms delay option)	tOCD2_DELAY	320	350	405	ms	350-ms delay option	10
Short-circuit detection delay time (360-µs delay option)	tSCD_RELAY	220	400	610	µs	360-µs delay option	10
Input voltage VDD, VC5-VC1, CCFG, CTRD, CTRC	VI	-0.3		36	V	Referenced to VSS	6
Input voltage LD	VI	-30		20	V	Referenced to VSS	6
Input voltage SRN, SRP, TS, AVDD, CCFG	VI	-0.3		3.6	V	Referenced to VSS	6
Output voltage DSG, CHGU	VO	-0.3		20	V	Referenced to VSS	6
Output voltage CHG	VO	-30		20	V	Referenced to VSS	6
Output voltage VTB	VO	-0.3		3.6	V	Referenced to VSS	6
Input current LD, CHG	II			500	µA		6
Input current CHGU, DSG	II			1	mA		6
Output current CHG	IO			1	mA		6
Output current CHGU, DSG	IO			1	mA		6
Storage temperature	Tstg	-65		150	°C		6
Supply voltage VDD	VBAT	3		25	V	Over operating free-air temperature range	6
Input voltage VC5-VC4 ... VC1-VSS (cell inputs)	VI	0		5	V	Over operating free-air temperature range	6
Input voltage CTRD, CTRC	VI	0			V	Over operating free-air temperature range	6
Input voltage CCFG	VI	0			V	Over operating free-air temperature range	6
Input voltage SRN, SRP	VI	-0.2		0.8	V	Over operating free-air temperature range	6
Input voltage LD	VI	0		16	V	Over operating free-air temperature range	6
Input voltage TS	VI	0			V	Over operating free-air temperature range	6
Output voltage CHG, CHGU, DSG	VO	0		16	V	Over operating free-air temperature range	6
Output voltage VTB, AVDD	VO	0		3	V	Over operating free-air temperature range	6
Operating free-air temperature range	TA	-40		85	°C		6
Junction-to-ambient thermal resistance (PW TSSOP 20 pins)	RθJA		98.4		°C/W		7

CAD (KiCad official)

Symbol: BQ7790400PWR
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)
3D model files: bq7790400pwr-etched.step / bq7790400pwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bq7790400pwr.step / bq7790400pwr.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (49 pp, sha256 d94ef1e3c87b48ab, retrieved 2026-10-31, tier: manufacturer)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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

BQ7790400PWR

Verified BQ7790400PWR

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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