SC820 datasheet(9/22 Pages) SEMTECH

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SC820

Pin Descriptions

Pin #

Pin Name

Pin Function

1VAD

Supply pin

— connect to charging adapter. This pin is protected against damage due to high voltage up to 30V.

VUSB

Supply pin

— connect to USB Vbus power. Typically 5V, limited load-current input. This pin is protected against

damage due to high voltage up to 30V.

3STATB

Status output pin

— This open-drain pin is asserted (pulled low) when a valid charging supply is connected to

either VAD or VUSB, and a charging cycle begins. It is released when the termination current is reached, indicating

that charging is complete. STATB is not asserted for re-charge cycles.

GND

Ground

IPUSB

Fast-charge and pre-charge current programming pin for the VUSB power source

— VUSB fast-charge current

is programmed by connecting a resistor from this pin to ground. VUSB pre-charge current is 20% of fast-charge

current.

IPRGM

Fast-charge and pre-charge current programming pin for the adapter power source

— VAD fast-charge current

is programmed by connecting a resistor from this pin to ground. VAD pre-charge current is 20% of fast-charge

current. The charging termination threshold current (for either VAD or VUSB input selection) is 10% of the IPRGM

programmed fast-charge current.

7BAT

Charger output

— connect to battery positive terminal.

ENB

Combined device enable/disable

— Logic high disables the device. Tie to GND to enable charging with indefinite

float-charging. Float this pin to enable charging without float-charge upon termination. Note that this pin must

be grounded if the SC820 is to be operated without a battery connected to BAT.

Thermal Pad

Pad is for heatsinking purposes

— not connected internally. Connect exposed pad to ground plane using mul-

tiple vias.

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