General Description

BD99954 is a Battery Management LSI for 1-4 cell

Lithium-Ion secondary battery, and available in a 40pin

0.40 mm pitch 5.0 mm x 5.0 mm QFN package and small

41-ball 0.4mm pitch 2.6mm x 3.0mm Wafer-Level CSP

package which is designed to meet high degree demands

for space-constraint equipment such as Low profile

Notebook PC, Tablets and other applications.

BD99954 provides a Dual-source Battery Charger, two

port BC1.2 detection and a Battery Monitor with several

alarm(INT#, PROCHOT#) outputs

Features

Dual-source Battery Charger

High efficiency Step-Up/Down switching charger for

1-4 cell Li-Ion/Li-poly battery

Two separate input sources for USB-VBUS and DC

adapter.

Two port BC1.2 detectors.

JEITA compliant charging profile

Programmable parameters for Preconditioning, Precharge

current, and Fast-charge current

Programmable charging voltage

Programmable charge current

Programmable Switching Frequency: 600kHz to

1.2MHz

Support USB BCS 1.2, ACA, ID pin, OTG

USB-VBUS Over Voltage Protection

Over Voltage Battery Protection

Battery Short Circuit Detection

Power Path Management with charge pump gate

driver

Flexibility power path control

Reverse Buck/Boost Option for USB/USB-PD

Bias voltage output for the external thermistor

PMON output

PROCHOT# output

Support Inhibit / Autonomous Charging

Battery Learn Function

Input Operating Range: 3.8V to 25V

Voltage Measurement for Thermistor.

Bias voltage output for the external thermistor.

SMBus Interface (Clock up friendly I2C) for Host

communication

Embedded OTPROM for initial settings

Applications

Ultrabook

Notebook PC

Ultra-mobile PC

Tablet PC