AT1314
Preliminary Product Information
High-Efficiency Step-Down
Current Regulator For LEDs
Feature
AT1314 is a voltage-mode PWM step-down
‧
4.75V to 16V Supply Voltage Operating
DC-DC converter capable of driving up to 1A
Range.
over
input supply range with excellent
‧
600KHz
±15%
Fixed Switching Frequency. loads and a wideregulation characteristics. High
line
load
‧
Voltage-Mode PWM Step-Down Regulator. efficiency is obtained through the use of a low
‧
Built-in Power MOSFET, Rds(on)≒100mΩ. Rds(on) P-channel power switch.
‧
1A Output Current, Up to 91.9% Efficiency
It uses a fixed switching frequency up to 600KHz
‧
0.4V±1.5% Internal Reference
thus allowing smaller sized components. The
‧
Shutdown Current less than 20uA.
output
via an
‧
Thermal-Shutdown and Built-in Soft-Start. externalvoltage level is user-programmable built-in
resistive voltage divider. The
‧
Cycle-by-Cycle Current-Limit Protection.
soft-start can reduce inrush current on the input
‧
Under-Voltage Lockout Protection.
source at turn on.
‧
Output Voltage Adjustable From 0.4V to 16V.
The device also has built-in cycle-by-cycle
‧
SOP-8 Package.
current-limit, thermal shutdown, under-voltage
lockout and an ON/OFF logic-control that can
Application
power down the regulator to a shutdown mode. In
‧
Backlight for LCD Panels
shutdown mode the regulator draws less than 20uA
of supply current.
‧
Battery-Powered Backlight Applications
‧
Cell Phones
AT1314 is available in SOP-8 package.
‧
PDAs
‧
Other Handheld Devices with Dual Displays.
Description
Block Diagram
EN
Regulator
Under-voltage
lockout
Current Sense
Amplifier
Current
Sense
+
-
Contol
Logic
IN
P-MOS
OSC
600KHz
PWM Comparator
Error
Amplifier
-
+
0.4V
Soft-
Start
SW
GND
FB
COMP
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
3/24/2006 REV:2.0
Email:
service@aimtron.com.tw
AIMTRON [ AIMTRON TECHNOLOGY ]
