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1 Features

1? Industrial Innovative Charge Controller With

Hybrid Power Boost Mode

– Adapter and Battery Provides Power to

System Together for Intel? CPU Turbo Mode

– Ultra-Fast Transient Response of 150 μs to

Enter Boost Mode

– Hybrid Power Boost Mode from 4.5- to 24-V

System

– Charge 1- to 4-Cell Battery Pack from 4.5- to

24-V Adapter

? High Accuracy Power and Current Monitoring for

CPU Throttling

– Comprehensive PROCHOT Profile

– ± 2% Current Monitor Accuracy

– ± 5% System Power Monitor Accuracy

(PMON)

? Automatic NMOS Power Source Selection from

Adapter or Battery

– ACFET Fast Turn on in 100 μs

? Programmable Input Current, Charge Voltage,

Charge and Discharge Current Limit

– ±0.4% Charge Voltage (16-mV step)

– ±2% Input Current (128-mA/step)

– ±2% Charge Current (64-mA/step)

– ±2% Discharge Current (512-mA/step)

? High Integration

– Battery LEARN Function

– Battery Present Monitor

– Boost Mode Indicator

– Loop Compensation

– BTST Diode

? Enhanced Safety Features for Overvoltage

Protection, Overcurrent Protection, Battery,

Inductor, and MOSFET Short-Circuit Protection

? Switching Frequency: 600 kHz, 800 kHz, and

1 MHz

? Realtime System Control on ILIM Pin to Limit

Charge and Discharge Current

? 0.65 mA Adapter Standby Quiescent Current for

Energy Star

2 Applications

? Notebook, Ultrabook, Detachable, and Tablet PC

? Handheld Terminal

? Industrial and Medical Equipment

? Portable Equipment

3 Description

The bq24780S device is a high-efficiency,

synchronous battery charger, offering low component

count for space-constrained, multi-chemistry battery

charging applications.

The bq24780S device supports hybrid power boost

mode (previously called turbo boost mode). It allows

battery discharge energy to system when system

power demand is temporarily higher than adapter

maximum power level. Therefore, adapter does not

crash.

The bq24780S device uses two charge pumps to

separately drive N-channel MOSFETs (ACFET,

RBFET, and BATFET) for automatic system power

source selection.

Through SMBus, system power management

microcontroller programs input current, charge

current, discharge current, and charge voltage DACs

with high regulation accuracies.

The bq24780S device monitors adapter current

(IADP), battery discharge current (IDCHG), and

system power (PMON) for host to throttle back CPU

speed or reduce system power when needed.

The bq24780S device charges 1-, 2-, 3-, or 4-series

Li+ cells.