AT1314
Preliminary Product Information
High-Efficiency Step-Down
Current Regulator For LEDs
Feature
•
4.75V to 16V Supply Voltage Operating
AT1314 is a voltage-mode PWM step-down
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
+
-
OSC
600KHz
Contol
Logic
PWM Comparator
Error
Amplifier
-
+
0.4V
Soft-
Start
P-MOS
IN
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
1/17/2006 REV:1.0
Email:
service@aimtron.com.tw
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