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參數(shù)資料
| 型號： | AT1799S-GRE |
| 廠商： | Aimtron Technology Corp. |
| 英文描述： | 2A Step-Down Voltage Regulator |
| 中文描述： | 第2A降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 356K |
| 代理商： | AT1799S-GRE |
AT1799
2A Step-Down Voltage Regulator
Feature
4.75V to 16V Supply Voltage Operating
Range.
380KHz 15% Fixed Switching Frequency.
Voltage-Mode PWM Step-Down Regulator.
Built-in Power MOSFET, Rds(on)
2A Output Current, Up to 91.9% Efficiency
1.215V 1.5% Internal Reference
Shutdown Current less than 20uA.
Thermal-Shutdown and Built-in Soft-Start.
Cycle-by-Cycle Current-Limit Protection.
Short Circuitry Protection.
Under-Voltage Lockout Protection.
Output Voltage Adjustable From 1.215V to
16V.
SOP-8 Package.
Application
Distributed Power Systems
Battery Charger.
Palmtop Computers, PDAs.
DSL Modems
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: 886-3-563-0878 Fax: 886-3-563-0879 WWW:
http://www.aimtron.com.tw
8/23/2006 REV:1.1 Email:
service@aimtron.com.tw
1
100m
.
Description
AT1799 is a voltage-mode PWM step-down
DC-DC converter capable of driving up to 2A
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.
It uses a fixed switching frequency up to 380KHz
thus allowing smaller sized components. The
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.
The device also has built-in cycle-by-cycle
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
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.
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