LTC4069 datasheet(7/16 Pages) LINER

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LTC4069

4069fb

SIMPLIFIED BLOCK DIAGRAM

OPERATION

–+

1000

VCC

MIN

ENABLE

2.9V

CHRG

PROG

GND

4069 F01

RPROG

BAT

PROG

C/10

–

TDIE

115°C

0.1V

1.2V

SUSPEND

TOO

HOT

TOO

COLD

NTC_EN

0.1V

3.6V

1.2V

REF

LOBAT

NTC

R10

VCC

–

UVLO

BAT

LOGIC

COUNTER

OSCILLATOR

CHARGE CONTROL

–

SHUTDOWN

SUSPEND

AND

RNOM

RNTC

Figure 1. LTC4069 Block Diagram

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

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