1 Features

1• Host-controlled NVDC-1 1S-4S Battery Charge

Controller with 4.5-24 V Input Range

– Support SMBus (bq24770) and I2C (bq24773)

– System Instant-on Operation with no Battery or

Deeply Discharged Battery

– Supplement Mode with Synchronous BATFET

Control when Adaptor is fully loaded

• Ultra Fast Input Current DPM at 100 μs

• Ultra Low Quiescent Current of 600 μA and High

PFM Light Load Efficiency >80% at 20 mA Load

to Meet Energy Star and ErP Lot6.

• High Accuracy Power / Current Monitor for CPU

Throttling

– Comprehensive PROCHOT Profile

– Input and Battery Current Monitor (IADP/IBAT)

– System Power Monitor (PMON)

• Programmable Input Current Limit, Charge

Voltage, Charge Current and Minimum System

Voltage Regulation

– ±0.5% Charge Voltage (16 mV/step)

– ±2% Input/charge Current (64 mA/step)

– ±2% 40x Input / 16x Discharge / 20x Charge

Current Monitor

• Support Battery LEARN Function

• High Integration

– NMOS ACFET and RBFET Driver

– PMOS battery FET Gate Driver

– Internal Loop Compensation

– Independent Comparator

– Automatic Trickle Charge to Wake up Gas

Gauge

• 600kHz to 1.2MHz Programmable Switching

Frequency

2 Applications

• Ultrabook, Notebook, Detachable, and Tablet PC

• Handheld Terminal

• Industrial, Medical, Portable Equipment

3 Description

The bq2477x is high-efficiency, synchronous, NVDC-

1 battery charge controllers, offering low component

count for space-constraint, multi-chemistry battery

charging applications.

The power path management allows the system to be

regulated at battery voltage but does not drop below

system minimum voltage (programmable). With this

feature, the system keeps operating even when the

battery is completely discharged or removed. The

power path management allows the battery to provide

supplement current to the system to keep the input

supply from being overloaded.

The bq2477x provides drivers and power path

management for N-channel ACFET and reverse

blocking FET. The devices provides driver to control

NVDC operation of external P-channel battery FET. It

also drives high-side and low-side MOSFETs of the

switching regulator.

The bq2477x monitors adapter current (IADP),

battery charge/discharge current (IBAT) and system

power (PMON). The flexibly programmed PROCHOT

output goes directly to CPU for throttle back when

needed.