PCN20070803

Features:

l  0.7W Internal Switch
l  Uses Small Surface Mount Components
l  Adjustable Output Voltage up to 20V
l  2V to 5.5V Input Range
l  Input Undervoltage Lockout
l  0.01mA Shutdown Current
l  Small 5-Lead SOT-25 Package
l  All AME's lead Free Product Meet RoHS
       Standards


Application

l  White LED Back-Lighting
l  Hand-held Devices
l  Digital Cameras
l  Portable Applications
l  LCD Bias Power


Description

The AME5138 is a fixed off-time step-up DC/DC con-
verter in a small 5-lead SOT-25 package. The AME5138
is ideal for LCD panels requiring low current and high effi-
ciency as well as LED applications for cellular phone back-
lighting, PDAs,and other hand-held devices.  The low 400ns
off-time allows the use of tiny external components.
   AME5138 is designed to drive up to four white LEDs
in series with a constant current from a single Li-lon bat-
tery.  To control LED brightness, the LED current can be
adjusted by applying a PWM (pulse width modulated)
signal with a frequency range of 100Hz to 50KHz to the
EN pin.