LTC4124 Просмотр технического описания (PDF) - Analog Devices

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LTC4124

100mA Wireless Li-Ion Charger with Low Battery Disconnect

Analog Devices 

LTC4124

PIN FUNCTIONS

ISEL1 (Pin 6): Charge Current Select Bit 1. Tie this pin to

VCC or GND to program the battery charge current. Do not

leave this pin open. Refer to Table 3 for programming the

desired charge current.

ISEL2 (Pin 7): Charge Current Select Bit 2. Tie this pin to

VCC or GND to program the battery charge current. Do not

leave this pin open. Refer to Table 3 for programming the

desired charge current.

Table 3. Battery Charge Current Programming

ISEL1

ISEL2

Charge Current

High

High

100mA

High

Low

50mA

Low

High

25mA

Low

Low

10mA

LBSEL (Pin 8): Low Battery Disconnect Voltage Select.

Tie this pin to VCC or GND to program the low battery

disconnect voltage level. Do not leave this pin open. Refer

to Table 4 for programming the desired low battery dis-

connect voltage level.

Table 4. Low Battery Disconnect Voltage Programming

LBSEL

Disconnect Voltage

High

3.2V

Low

2.7V

NTC (Pin 9): Thermistor Input. Connect a 100kΩ thermis-

tor from NTC to GND. This pin is internally pulled up with

a 100kΩ, 1% resistor to VCC. The voltage level on this pin

determines if the battery temperature is safe for charging.

Charging and the charge timer are paused if the thermis-

tor indicates temperature that is unsafe for charging. Once

the temperature returns to the safe region, charging and

the charge timer resume. Connect this pin to VCC to dis-

able the temperature qualified charging feature.

BAT (Pin 10): Battery. Connect the Li-Ion battery to

this pin.

ACIN (Pin 11): AC Input Supply Voltage. Connect the

external LC tank (receive inductor and capacitor) to this

pin. An internal diode is connected from this pin (anode)

to the VCC pin (cathode). This pin supplies power to the

VCC pin when its peak voltage is higher than the DCIN pin

voltage. Short this pin to GND when not used.

DCIN (Pin 12): Optional DC Input Supply Voltage: 3.3V to

5.5V. An internal diode is connected from this pin (anode)

to the VCC pin (cathode). This pin supplies power to the

VCC pin when its voltage is higher than the peak voltage

of the ACIN pin. Short this pin to GND when not used.

GND (Exposed Pad, Pin 13): Device Ground. Connect

this ground pin to a suitable PCB copper ground plane for

proper electrical operation and rated thermal performance.

Rev. A

For more information www.analog.com

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