B1

C1

D1

SW

PMID

PGND

B2

C2

D2

SW

PMID

PGND

B3

C3

D3

SW

PMID

PGND

B4

C4

D4

STAT

SDA

OTG

A1

VBUS

A2

VBUS

A3

BOOT

A4

SCL

E1

CSIN

E2

CD

E3

VREF

E4

CSOUT

bq24157

(Top View)

bq24157

www.ti.com

SLUSB80 – SEPTEMBER 2012

PIN LAYOUT (20-Bump YFF Package)

PIN FUNCTIONS

PIN

I/O

DESCRIPTION

NAME

NO.

Battery voltage and current sense input. Bypass it with a ceramic capacitor (minimum 0.1

μF) to PGND if there are

CSOUT

E4

I

long inductive leads to battery.

Charger input voltage. Bypass it with a 1-

μF ceramic capacitor from VBUS to PGND. It also provides power to the

VBUS

A1, A2

I/O

load during boost mode .

Connection point between reverse blocking FET and high-side switching FET. Bypass it with a minimum of 3.3-

μF

PMID

B1, B2, B3

I/O

capacitor from PMID to PGND.

SW

C1, C2, C3

O

Internal switch to output inductor connection.

Bootstrap capacitor connection for the high-side FET gate driver. Connect a 10-nF ceramic capacitor (voltage rating

≥

BOOT

A3

I/O

10 V) from BOOT pin to SW pin.

PGND

D1, D2, D3

Power ground

Charge current-sense input. Battery current is sensed across an external sense resistor. A 0.1-

μF ceramic capacitor

CSIN

E1

I

to PGND is required.

SCL

A4

I

SDA

B4

I/O

Charge status pin. Pull low when charge in progress. Open drain for other conditions. During faults, a 128-

μs pulse is

STAT

C4

O

sent out. STAT pin can be disabled by the EN_STAT bit in control register. STAT can be used to drive a LED or

communicate with a host processor.

Internal bias regulator voltage. Connect a 1µF ceramic capacitor from this output to PGND. External load on VREF is

VREF

E3

O

not recommended.

Charge disable control pin. CD=0, charge is enabled. CD=1, charge is disabled and VBUS pin is high impedance to

CD

E2

I

GND.

Boost mode enable control or input current limiting selection pin. When OTG is in active status, the device is forced to

OTG

D4

I

PART NUMBER

MARKING

MEDIUM

QUANTITY

bq24157YFFR

bq24157A

Tape and Reel

3000

bq24157YFFT

bq24157A

Tape and Reel

250

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com.

Copyright © 2012, Texas Instruments Incorporated

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