E-L6920D Datasheet, PDF (1/13 Pages) STMicroelectronics – 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER

L6920
1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER
1 Features
■ 0.6 TO 5.5V OPERATING INPUT VOLTAGE
■ 1V START UP INPUT VOLTAGE
■ INTERNAL SYNCHRONOUS RECTIFIER
■ ZERO SHUT DOWN CURRENT
■ 3.3V AND 5V FIXED OR ADJUSTABLE
OUTPUT VOLTAGE (2V UP TO 5.2V)
■ 120mΩ INTERNAL ACTIVE SWITCH
■ LOW BATTERY VOLTAGE DETECTION
■ REVERSE BATTERY PROTECTION
1.1 Applications
■ ONE TO THREE CELL BATTERY DEVICES
■ PDA AND HAND HELD INSTRUMENTS
■ CELLULAR PHONES - DIGITAL CORDLESS
PHONE
■ PAGERS
■ GPS
■ DIGITAL CAMERAS
Figure 1. Application Circuit
Figure 1. Package
TSSOP8
Table 1. Order Codes
Part Number
L6920D
L6920DTR
Package
TSSOP8 Tube
Tape & Reel
2 Description
The L6920 is a high efficiency step-up controller re-
quiring only three external components to realize the
conversion from the battery voltage to the selected
output voltage.
The start up is guaranteed at 1V and the device is op-
erating down to 0.6V.
Internal synchronous rectifier is implemented with a
120mΩ P-channel MOSFET and, in order to improve
the efficiency, a variable frequency control is imple-
mented.
V_CC
2.5V
L1
LX
C2
SHDN
LBI
REF
7
8
1
5
L6920D
2
3
4
6
OUT
FB
C3
LBO
GND
V_OUT
3.3V
500mA
C1
February 2005
Rev. 2
1/13