AT1799 Datasheet, PDF (1/14 Pages) Aimtron Technology – 2A Step-Down Voltage Regulator

AT1799
2A Step-Down Voltage Regulator
Feature
‧
4.75V to 16V Supply Voltage Operating
Description
AT1799 is a voltage-mode PWM step-down
Range.
DC-DC converter capable of driving up to 2A
‧
380KHz Ô15% Fixed Switching Frequency.
‧
Voltage-Mode PWM Step-Down Regulator.
‧
Built-in Power MOSFET, Rds(on)Ý100mƸ.
loads over a wide input supply range with excellent
line and load regulation characteristics. High
efficiency is obtained through the use of a low
Rds(on) P-channel power switch.
‧
2A Output Current, Up to 91.9% Efficiency
‧
1.215VÔ1.5% Internal Reference
It uses a fixed switching frequency up to 380KHz
‧
Shutdown Current less than 20uA.
thus allowing smaller sized components. The
‧
Thermal-Shutdown and Built-in Soft-Start.
‧
Cycle-by-Cycle Current-Limit Protection.
‧
Short Circuitry Protection.
output voltage level is user-programmable via an
external resistive voltage divider. The built-in
soft-start can reduce inrush current on the input
source at turn on.
‧
Under-Voltage Lockout Protection.
‧
Output Voltage Adjustable From 1.215V to ^{The device also has built-in cycle-by-cycle}
16V.
‧
SOP-8 Package.
current-limit, thermal shutdown, under-voltage
lockout and an ON/OFF logic-control that can
power down the regulator to a shutdown mode. In
shutdown mode the regulator draws less than 20uA
Application
‧
Distributed Power Systems
‧
Battery Charger.
‧
Palmtop Computers, PDAs.
‧
DSL Modems
of supply current. When a short circuit is detected
on the output , the device immediately change
switching frequency to 42 KHz and duty cycle is
limited to 5% to protect IC from damage.
AT1799 is available in SOP-8 package.
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] Fax: [phone]
WWW: http://www.aimtron.com.tw
8/23/2006 REV:1.1
Email: [e-mail]
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