PS0021

PIN CONFIGURATION

PIN DESIGNATOR

Name

Pin

Type

Function

SW

1

Switch

Connect inductor between SW and Battery.

July 2007

www.picsemi.com

© 2007 Power IC. All Rights Reserved.

2

LBI

2

Low–Battery

Detector Input.

Connect a resistive divider from Battery to LBI to ground.

EN

3

Enable

EN=High: normal operation. (Supports both TTL and CMOS Logic).

LBO

4

Low Battery

Detector Output

Open–Drain Output. Low–Battery Detector Output is LOW when

VLBI is less than 0.6 V.

GND

5

Ground

Power Ground

VOUT

6

IC Power Supply

VOUT supplies power to Step-up converter.

Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed

by design.

Note 2: Guaranteed with the addition of a Schottky MBR0520L external diode between LX and OUT when using the

PS0021 with only one cell, and assumes a 0.3V voltage drop across the Schottky diode (see Figure 3).

Note 3: Supply current is measured with an ammeter between the output and OUT pin. This current correlates directly

with actual battery supply current, but is reduced in value according to the step-up ratio and efficiency.

Note 4: VOUT forced to the following conditions to inhibit switching: VOUT = 1.05

✕ VOUT (NOM)

VOUT = 3.465V