LTC4069EDC-TRPBF(RevB) 查看數據表（PDF） - Linear Technology

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LTC4069EDC-TRPBF
(Rev.:RevB)

Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input

Linear Technology 

SIMPLIFIED BLOCK DIAGRAM

VCC

4

VCC

VCC

TDIE

+

D3

R7

TA

115°C

–

–

M2

TOO

1s

COLD

C1

+

VCC

R8

OR

AND

SUSPEND

D1

RNOM

NTC

5

RNTC

R9

R10

CHRG

2

+

C2

TOO

–

HOT

+

NTC_EN

C3

–

REF

1.2V

PROG 0.1V

R3

1V

R4

0.1V

C/10

R5

–

2.9V

LOBAT

+

BAT

CA

–+

MP

–+

MA

ENABLE

+

C4

4V –

PROG

6

RPROG

LTC4069

M1

1000s

+

C5

3.6V –

D2

UVLO

R1

VA

BAT

3

+

1.2V

R2

CHARGE CONTROL

MIN

SUSPEND

LOGIC

COUNTER

SHUTDOWN

GND

1

OSCILLATOR

4069 F01

Figure 1. LTC4069 Block Diagram

OPERATION

The LTC4069 is a linear battery charger designed primarily

for charging single cell lithium-ion batteries. Featuring

an internal P-channel power MOSFET, the charger uses a

constant-current/constant-voltage charge algorithm with

programmable current. Charge current can be programmed

up to 750mA with a final float voltage accuracy of ±0.6%.

The CHRG open-drain status output indicates if C/10 has

been reached. No blocking diode or external sense resistor

is required; thus, the basic charger circuit requires only

two external components. An internal termination timer

and trickle charge low-battery conditioning adhere to

battery manufacturer safety guidelines. Furthermore, the

LTC4069 is capable of operating from a USB power

source.

An internal thermal limit reduces the programmed charge

current if the die temperature attempts to rise above a

preset value of approximately 115°C. This feature protects

the LTC4069 from excessive temperature and allows the

user to push the limits of the power handling capability

of a given circuit board without risk of damaging the

LTC4069 or external components. Another benefit of

the LTC4069 thermal limit is that charge current can

be set according to typical, not worst-case, ambient

4069fb

7

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