© 2008 Semtech Corporation

SC802/SC802A

7

Pin Descriptions

Pin #

Pin Name

Pin Function

1

BSEN

Battery voltage sense pin — Connect to battery terminal to Kelvin sense battery voltage, to a

resistor divider network for adjustable output voltage, or to VOUT otherwise. Do not leave this pin

floating.

2

VPRGM

Selectable voltage program pin — Logic low = 4.1V; Logic high = 4.2V; Resistor = adjustable.

3

IPRGM

Charger current program pin in fast-charge mode — Requires a resistor to ground to program

fast-charge current.

4

ITERM

Selection for current termination and pre-charge current — Requires a resistor to ground to pro-

gram pre-charge and termination current.

5

REFGND

Reference ground — Allows Kelvin connection to battery negative terminal.

6

GND

Ground

7

EN_NTC

Combined device enable/disable and NTC input pin — Logic high enables device; logic low dis-

ables device. Analog voltages between 0.3×V

VCC

and 0.75×V

VCC

enable the NTC function.

8

BIPB

Battery In Place Bar (BIPB) — selects Charge/LDO mode. BIPB = Low selects charge mode.

BIPB = High selects LDO mode which disables Pre-Charge and timer functions

9

AFC

Analog fast-charge setting — Connect to DAC for analog control of fast-charge current value.

Connect to VCC to disable AFC. Do not leave open.

10

CHRGB

Open drain charger status pin — The output is active low when the charger is on and I

VOUT

> I

TERM

.

The CHRGB output switches to high impedance when I

VOUT

< I

TERM

. This pin can sink 10mA.

11

CPB

Open Drain Charger present indicator — The output is active low when the V

VCC

exceeds VT

UVLOR

.

This pin can sink 10mA.

12

RTIME

Programmable timer input pin — Connect to VCC to select the internal time-out of 3hrs. Connect

an external resistor to ground to program the timeout period. Connect to ground to disable the

timer.

13

VCC1

14

VCC2

15

VOUT1

16

VOUT2

T

Thermal Pad

pad to ground plane using multiple vias.

Notes:

(1)

VCC1 and VCC2 must be connected. VCC1 and VCC2 will be referred to collectively as VCC. All references to V

VCC

and I

VCC

refer to the common

node voltage and total current of VCC1 and VCC2.

(2)

VOUT1 and VOUT2 must be connected. VOUT1 and VOUT2 will be referred to collectively as VOUT. All references to V

VOUT

and I

VOUT

refer to the

common node voltage and total current of VOUT1 and VOUT2.