LTC4081(RevA) View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC4081
(Rev.:RevA)

500mA Li-Ion Charger with NTC Input and 300mA Synchronous Buck

Linear Technology 

LTC4081

BLOCK DIAGRAM

3

EN_CHRG

0.82V

REN

+

C3

–

PROG 0.1V

CHARGER

SHUTDOWN

MP3

X1

D1

C1

CA

–+

2

VCC

–+

MA

MP1

X400

R1

D3

115C

TA

D2

TDIE

1

BAT

VA

6

CHRG

MP4

1V

1.22V

R2

2.9V

BAT

4

PROG

RPROG

+

C2

–

VCC

VCC

R9

RNOM

NTC

5

R10

T RNTC

PULSE 0.1V

LOGIC

BADBAT

–

TOO COLD

C8

+

–

C9

TOO HOT

+

CHARGER

ENABLE

VCC

3.6V

+

C4

–

UVLO

VBAT + 80mV

+

C5

–

SUSPEND

CHARGE

CONTROL

LOGIC

CHARGER

OSCILLATOR

COUNTER

R11

+

C10

–

R12

9

EN_BUCK

0.82V

+

– C6

8

MODE

0.82V

+

– C7

NTC_EN

ENABLE BUCK

2.25MHz

BUCK

OSCILLATOR

LINEAR BATTERY CHARGER

SYNCHRONOUS BUCK CONVERTER

11

GND

PWM

CONTROL

AND DRIVE

ERROR

AMP

0.8V

MP2

10

SW

MN1

L1

VOUT

CPL R7

7

COUT

FB

R8

4081 BD

4081fa

10

For more information www.linear.com/LTC4081

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