LTC4009-2(RevB) データシートの表示（PDF） - Linear Technology

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LTC4009-2
(Rev.:RevB)

High Efficiency, Multi-Chemistry Battery Charger

Linear Technology 

FEATURES

n General Purpose Battery Charger Controller

n Efficient 550kHz Synchronous Buck PWM Topology

n ±0.5% Output Float Voltage Accuracy

n Programmable Charge Current: 4% Accuracy

n Programmable AC Adapter Current Limit:

3% Accuracy

n No Audible Noise with Ceramic Capacitors

n Wide Input Voltage Range: 6V to 28V

n Wide Output Voltage Range: 2V to 28V

n Indicator Outputs for AC Adapter Present, Charging,

C/10 Current Detection and Input Current Limiting

n Analog Charge Current Monitor

n Micropower Shutdown

n Thermally Enhanced 20-Pin 4mm × 4mm × 0.75mm

QFN Package

APPLICATIONS

n Notebook Computers

n Portable Instruments

n Battery Backup Systems

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 5723970.

LTC4009

LTC4009-1/LTC4009-2

High Efficiency,

Multi-Chemistry

Battery Charger

DESCRIPTION

The LTC4009 is a constant-current/constant-voltage battery

charger controller. It uses a synchronous quasi-constant

frequency PWM control architecture that will not generate

audible noise with ceramic bulk capacitors. Charge cur-

rent is set by the combination of external sense, input and

programming resistors. With no built-in termination, the

LTC4009 family charges a wide range of batteries under

external control.

The LTC4009 features a fully adjustable output voltage, while

the LTC4009-1 and LTC4009-2 can be pin-programmed for

lithium-ion/polymer battery packs of 1-, 2-, 3- or 4-series

cells. The LTC4009-1 provides output voltage of 4.1V/cell,

and the LTC4009-2 is a 4.2V/cell version.

The device includes AC adapter input current limiting which

maximizes the charge rate for a fixed input power level. An

external sense resistor programs the input current limit, and

the ICL status pin indicates when the battery charge current

is being reduced as a result of AC adapter current limiting.

The CHRG status pin is active during all charging modes,

including special indication for low charge current.

TYPICAL APPLICATION

FROM

ADAPTER

13V TO 20V

0.1μF

CHARGE

CURRENT

MONITOR

14.3k

1.5k

TO/FROM

MCU

DCIN

CLP

CLN

DCDIV BOOST

LTC4009

TGATE

CHRG

ACP

SW

INTVDD

ICL

BGATE

SHDN GND

ITH

CSP

6.04k

0.1μF

PROG

4.7nF 26.7k

CSN

BAT

FBDIV

VFB

33mΩ

0.1μF

5.1k

0.1μF

2μF

3.01k

3.01k

20μF

301k

32.8k

POWER TO

20μF

SYSTEM

6.8μH

33mΩ

+ 12.3V

Li-Ion

BATTERY

4009 TA01a

Efficiency at DCIN = 20V

100

10000

95

90

85

80

75

70

0

EFFICIENCY

POWER LOSS

1000

VFLOAT = 12.3V

RSENSE = 33mΩ

RIN = 3.01k

RPROG = 26.7k

DIN = SSB44

L = IHLP-2525CZ 6.8μH

100

0.5 1.0 1.5 2.0 2.5 3.0

CHARGE CURRENT (A)

4009 TA01b

4009fb

1

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