LBPG View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LBPG

Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN

Linear Technology 

SI PLIFIED BLOCK DIAGRA S

VCC

4

VCC

ACPR

5

C2

3.6V

M2

×1

D1

C3

VBAT + 80mV

PROG 0.1V

C/10

REF

1.2V

R3

1V

R4

0.1V

CA

–+

MP

–+

MA

CHRG

2

R5

–

2.9V

LOBAT

+

BAT

ENABLE

+

C1

4V –

PROG

6

RPROG

LTC4065/LTC4065A

D3

M1

×1000

D2

R1

VA

TDIE

TA

115°C

BAT

3

+

1.2V

R2

CHARGE CONTROL

LOGIC

SHUTDOWN

GND

1

COUNTER

OSCILLATOR

4056 F01b

Figure 1b. LTC4065A Block Diagram

U

OPERATIO

The LTC4065 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. The ACPR pin (LTC4065A)

monitors the status of the input voltage with an open-drain

output. An internal termination timer and trickle charge

low-battery conditioning adhere to battery manufacturer

safety guidelines. Furthermore, the LTC4065 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 LTC4065 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 LTC4065

or external components. Another benefit of the LTC4065

thermal limit is that charge current can be set according to

4065f

9

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