ltc4012-ltc4012-2 Linear Technology Corporation, ltc4012-ltc4012-2 Datasheet

ltc4012-ltc4012-2

Manufacturer Part Number

ltc4012-ltc4012-2

Description

High Efficiency, Multi-chemistry Battery Charger With Powerpath Control

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC4012-LTC4012-2.pdf (28 pages)

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Features

applications

typical application

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners. Protected by U.S. Patents including 5723970.

13V TO 28V

ADAPTER

General Purpose Battery Charger Controller

Efficient 550kHz Synchronous Buck PWM Topology

±0.5% Output Float Voltage Accuracy

Programmable Charge Current: 4% Accuracy

Programmable AC Adapter Current Limit:

3% Accuracy

No Audible Noise with Ceramic Capacitors

INFET Low Loss Ideal Diode PowerPath™ Control

Wide Input Voltage Range: 6V to 28V

Wide Output Voltage Range: 2V to 28V

Indicator Outputs for AC Adapter Present, Charging,

C/10 Current Detection and Input Current Limiting

Analog Charge Current Monitor

Micropower Shutdown

20-Pin 4mm × 4mm × 0.75mm QFN Package

Notebook Computers

Portable Instruments

Battery Backup Systems

FROM

26.7k

TO/FROM

MCU

6.04k

0.1µF

4.7nF

INFET

DCIN

ACP

CHRG

ICL

SHDN

ITH

PROG

LTC4012

INTV

BOOST

BGATE

TGATE

FBDIV

GND

CSN

CLP

CLN

CSP

BAT

0.1µF

32.8k

301k

3.01k

2µF

0.1µF

25m

5.1k

20µF

33m

6.8µH

12.3V

Li-Ion

BATTERY

Multi-Chemistry Battery Charger

POWER TO

SYSTEM

4012 TA01

Description

The LTC4012 is a constant-current /constant-volt-

age battery charger controller. It uses a synchronous

quasi-constant frequency PWM control architecture

that will not generate audible noise with ceramic bulk

capacitors. Charge current is set by external resis-

tors and can be monitored as an output voltage.

With no built-in termination, the LTC4012 family charges

a wide range of batteries under external control.

The LTC4012 features fully adjustable output voltage, while

the LTC4012-1 and LTC4012-2 can be pin-programmed for

Lithium-Ion/Polymer battery packs of 1-, 2-, 3- or 4-series

cells. The LTC4012-1 provides output voltage of 4.1V/cell

and the LTC4012-2 is a 4.2V/cell version.

The device includes AC adapter input current limiting, which

maximizes charge rate for a fixed input power level. An

external sense resistor programs the input current limit,

and the ICL status pin indicates reduced charge current as

a result of AC adapter current limiting. Ideal diode control

at the adaptor input improves charger efficiency.

The CHRG status pin is active during all charging modes,

including special indication for low charge current.

with PowerPath Control

LTC4012-1/LTC4012-2

100

Efficiency at DCIN = 20V

0.5

LTC4009

LTC4012

CHARGE CURRENT (A)

PART

High Efficiency,

EFFICIENCY

INFET

1.5

PIN NAME

POWER LOSS

DCDIV

OUT

SENSE

PROG

= 3.01k

= 12.3V

= 26.7k

= 33m

2.5

4012 TA02

LTC4012/

10000

100

1000

4012fa

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