R

SR

Adapter

4.5-24V

HOST

bq24780S

Hybrid Power

Boost Charge

Controller

SYS

Battery

Pack

N-FET Driver

N-FET Driver

1S-4S

SMBus

IADP,

,

PROCHOT

PMON, IDCHG

SMBus Controls V & I

with high accuracy

Adapter Detection

Enhanced Safety:

OCP, OVP, FET Short

Integration:

Loop Compensation; Soft-Start

Comparator, BTST Diode

R

AC

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

bq24780S

SLUSC93A – APRIL 2015 – REVISED APRIL 2015

bq24780S 1- to 4-Cell Hybrid Power Boost Mode Battery Charge Controller

With Power and Processor Hot Monitoring

1 Features

2 Applications

1

•

Industrial Innovative Charge Controller With

•

Notebook, Ultrabook, Detachable, and Tablet PC

Hybrid Power Boost Mode

•

Handheld Terminal

–

Adapter and Battery Provides Power to

•

Industrial and Medical Equipment

•

Portable Equipment

–

Ultra-Fast Transient Response of 150 µs to

Enter Boost Mode

3 Description

–

Hybrid Power Boost Mode from 4.5- to 24-V

The

bq24780S

device

is

a

high-efficiency,

synchronous battery charger, offering low component

System

count for space-constrained, multi-chemistry battery

–

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

charging applications.

24-V Adapter

The bq24780S device supports hybrid power boost

•

High Accuracy Power and Current Monitoring for

mode (previously called "turbo boost mode"). It allows

CPU Throttling

battery discharge energy to system when system

–

Comprehensive PROCHOT Profile

power demand is temporarily higher than adapter

–

± 2% Current Monitor Accuracy

maximum power level. Therefore, adapter does not

crash.

–

± 5% System Power Monitor Accuracy

(PMON)

The bq24780S device uses two charge pumps to

separately

drive

N-channel

MOSFETs

(ACFET,

•

Automatic NMOS Power Source Selection from

RBFET, and BATFET) for automatic system power

Adapter or Battery

source selection.

–

ACFET Fast Turn on in 100 µs

Through

SMBus,

system

power

management

•

Programmable Input Current, Charge Voltage,

microcontroller

programs

input

current,

charge

Charge and Discharge Current Limit

current, discharge current, and charge voltage DACs

–

±0.4% Charge Voltage (16-mV step)

with high regulation accuracies.

–

±2% Input Current (128-mA/step)

The bq24780S device monitors adapter current

–

±2% Charge Current (64-mA/step)

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

system power (PMON) for host to throttle back CPU

–

±2% Discharge Current (512-mA/step)

speed or reduce system power when needed.

•

High Integration

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

–

Battery LEARN Function

Li+ cells.

–

Battery Present Monitor

–

Boost Mode Indicator

Device Information(1)

–

Loop Compensation

PART NUMBER

PACKAGE

BODY SIZE (NOM)

–

BTST Diode

bq24780S

WQFN (28)

•

Enhanced Safety Features for Overvoltage

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

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

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.