BQ51221 datasheet(9/50 Pages) TI2

9 / 50 page

over operating free-air temperature range, –40°C to 125°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOL

Open-drain CHG pin

ISINK = 5 mA

500

IOFF

CHG leakage current when disabled

V CHG = 20 V

µA

COMM PIN

RDS(ON)

COMM1 and COMM2

VRECT = 2.6 V

1.5

fCOMM

Signaling frequency on COMM pin

kbps

IOFF

COMMx pin leakage current

VCOMM1 = 20 V, VCOMM2 = 20 V

µA

CLAMP PIN

RDS(ON)

CLAMP1 and CLAMP2

0.8

ADAPTER ENABLE

VAD-Pres

VAD Rising threshold voltage

VAD 0 V → 5 V

3.5

3.6

3.8

VAD-PresH

VAD hysteresis

VAD 5 V → 0 V

400

IAD

Input leakage current

VRECT = 0 V, VAD = 5 V

μA

RAD

Pullup resistance from AD-ENto OUT when

adapter mode is disabled and VOUT > VAD,

EN-OUT

VAD = 0 V, VOUT = 5 V

200

350

VAD-Diff

Voltage difference between VAD and V AD-EN

when adapter mode is enabled

VAD = 5 V, 0°C ≤ TJ ≤ 85°C

4.5

SYNCHRONOUS RECTIFIER

IOUT-SR

IOUT at which the synchronous rectifier

enters half-synchronous mode, SYNC_EN

ILOAD 200 mA → 0 mA

100

135

IOUT-SRH

Hysteresis for IOUT,SR (full-synchronous

mode enabled)

ILOAD 0 mA → 200 mA

VHS-DIODE

High-side diode drop when the rectifier is in

half-synchronous mode

IAC-VRECT = 250 mA and

TJ = 25°C

0.7

EN1 AND EN2

VIL

Input low threshold for EN1 and EN2

0.4

VIH

Input high threshold for EN1 and EN2

1.3

RPD

EN1 and EN2 pulldown resistance

200

kΩ

ADC (WPC RELATED MEASUREMENTS AND COEFFICIENTS)

IOUT SENSE

Accuracy of the current sense over the load

range

IOUT = 750 mA - 1000 mA

–1.5%

0.9%

www.ti.com

BQ51013B

SLUSB62D – MARCH 2013 – REVISED SEPTEMBER 2020

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