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LTC4007-1

Analog Devices

LTC4007-1 RSS Sample
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Kod:
LTC4007-1
Producent:
ANALOG DEVICES
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The LTC4007-1 is a constant-current/constant-voltage charger controller for 3- or 4-cell lithium-ion batteries. The PWM controller uses a synchronous, quasi-constant frequency, constant off-time architecture that will not generate audible noise even when using ceramic capacitors. Charging current is programmable to ±4% accuracy using a programming resistor. Charging current can also be monitored as a voltage across the programming resistor.

The output float voltage is pin programmed for cell count (3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer, programmed by an external resistor, sets the total charge time.

The LTC4007-1 includes a thermistor input, which suspends charging if an unsafe temperature condition is detected. If the cell voltage is less than 3.25V, a low-battery indicator asserts and can be used to program a trickle charge current to safely charge depleted batteries. The FAULT pin is also asserted and charging terminates if the low-battery condition persists for more than 1/4 of the total charge time.

LTC4007

LTC4007-1

Low battery threshold 4.2V cell

2.5V

3.25V

Low battery threshold 4.1V cell

2.44V

3.173V

Restart

Enabled

Disabled

Package

SSOP-24

QFN-24

* Notebook Computers

* Portable Instruments

* Battery-Backup Systems

* Li-Ion Chargers

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