LTC4069EDC-PBF View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC4069EDC-PBF

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

Linear Technology 

LTC4069

Operation

value of the NTC thermistor drops to 0.53 times the value

of RNOM, which corresponds to approximately 40°C, and

when the value of the NTC thermistor increases to 3.26

times the value of RNOM, which corresponds to approx-

imately 0°C. Hold mode freezes the timer and stops the

charge cycle until the thermistor indicates a return to a

valid temperature. For a Vishay NTHS0603N01N1003J

thermistor, this value is 32.6k which corresponds to

VCC

approximately 0°C. The hot and cold comparators each

have approximately 3°C of hysteresis to prevent oscillation

about the trip point.

When the charger is in Hold mode (battery temperature is

either too hot or too cold) the CHRG pin pulses in a 2Hz,

25% duty cycle frequency unless the charge task is finished

or the battery is assumed to be defective. If the NTC pin

is grounded, the NTC function will be disabled.

RNOM

–

0.76 • VCC

NTC

+

6

RNTC

–

+

0.35 • VCC

+

0.016 • VCC

–

TOO COLD

TOO HOT

NTC_ENABLE

4069 F03

Figure 3. NTC Circuit Information

For more information www.linear.com/LTC4069

4069fc

11

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