PS0021 Datasheet, PDF (2/12 Pages) Power IC Ltd. – High Efficiency PFM Step-up DC/DC Converter

PIN CONFIGURATION
PS0021
PIN DESIGNATOR
Name Pin
Type
Function
SW
1
Switch
Connect inductor between SW and Battery.
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
July 2007
www.picsemi.com
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