AMS1027
DESCRIPTION
The AMS1027 is a 5-pin thin SOT23 current
mode step up converter intended for small, low
power applications. The AMS1027 switches at
1.3MHz and allows the use of tiny, low cost
capacitors and inductors 2mm or less in height.
Internal soft start results in small inrush current
and extends battery life.The AMS1027 operates
from an input voltage as low as 2.5V and can
generate 12V at up to 200mA from a 5V supply.
The AMS1027 includes under-voltage lockout,
current limiting, and thermal overload protection
to prevent damage in the event of an output
overload. The AMS1027 is available in a small
5-pin SOT23 package.
FEATURES
On Board Power MOSFET
Uses Tiny Capacitors and Inductors
1.3MHz Fixed Switching Frequency
Internally Compensated
Internal Soft-Start
Operates with Input Voltage as Low as 2.5V
and Output Voltage as High as 22V
12V at 200mA from 5V Input
UVLO, Thermal Shutdown
Internal Current Limit
Available in a SOT23-5 Package
APPLICATIONS
Camera Phone Flash
Handheld Computers and PDAs
Digital Still and Video Cameras
External Modems
Small LCD Displays
White LED Driver
TYPICAL APPLICATION
V
IN
5V
D1
V
OUT
12V
200mA
5
OFF ON
1
SW
4
2
IN
EN
GND
AMS1027
FB
3
Vout=1.25(1+R1/R2) (V)
1
Advanced Monolithic Systems http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
