 2007 Semtech Corp.

www.semtech.com

SC805A

7

POWER MANAGEMENT

Pin Descriptions (Cont.)

Pin

Pin Name

Pin Function

1

VCC

Supply pin – connect to adapter power

2

VCCIL

Adapter input voltage – this pin provides a bias voltage approximately equal to the adapter

input voltage. When charging, the output current will be reduced by the load current on

VCCIL.

3

VOUT

Charger output – connect to battery

4

IPRGM

Current limit program pin for charge and LDO-mode – requires a resistor to ground to

program fast-charge current.

5

ITERM

Selection for current termination and pre-charge current – requires a resistor to ground to

program pre-charge and termination current.

6

GND

Ground

7

EN/NTC

Combined device enable/disable and NTC input pin – logic low disables the device.

Analog voltages between 0.3VCC and 0.75VCC enable the NTC function. Voltages above

95% of VCC force the NOBAT output high.

8

NOBAT

Battery Present Indicator – this output goes high when the NTC voltage exceeds 95% of

VCC indicating the battery and NTC have been removed.

9

RTIME

Charge time programming resistor – connect a resistor between RTIME and GND to

program the charge time. Force the pin to GND to disable the timer. Force the pin to VCC

to select LDO-mode.

10

CHRGB

Output status indicator designed to drive two LEDs. Connect cathode of the ‘charging’

LED to this pin to indicate charge in progress. Connect the anode of the ‘charge’

completed to this pin to indicate charge complete.

T

Thermal Pad

Pad is for heatsinking purposes – not connected internally. Connect exposed pad to

ground plane with thermal vias directly under pad.

Pin Descriptions