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CS8141

更新时间： 2024-09-30 22:50:35
品牌 Logo 应用领域
樱桃 - CHERRY 稳压器
页数 文件大小 规格书
12页 218K
描述
5V, 500mA Linear Regulator with ENABLE, , and Watchdog RESET

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CS8141 数据手册

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CS8140/1  
5V, 500mA Linear Regulator  
with  
, and Watchdog  
Features  
RESET  
ENABLE,  
Description  
The CS8140 is a 5V Watchdog  
of three conditions: the watchdog sig-  
nal moves outside of its preset limits;  
the output voltage drops out of regula-  
tion by more than 4.5%; or the IC is in  
5V ± 4%, 500mA Output  
■
Regulator with protection circuitry and  
three logic control functions that allow  
a microprocessor to control its own  
power supply. The CS8140 is designed  
for use in automotive, switch mode  
power supply post regulator, and bat-  
tery powered systems.  
Voltage  
µP Compatible Control  
Functions  
■
RESET  
its power up sequence. The  
sig-  
Watchdog  
nal is independent of VIN and reliable  
down to VOUT = 1V.  
RESET  
ENABLE  
In conjunction with the Watchdog, the  
ENABLE function controls the regula-  
torÕs power consumption. The CS8140Õs  
output stage and its attendant circuitry  
are enabled by setting the ENABLE  
lead high. The regulator goes into sleep  
mode (IOUT = 250µA) when the  
ENABLE lead goes low and the watch-  
dog signal moves outside its preset  
window limits. This unique combina-  
tion of control functions in the CS8140  
gives the microprocessor control over  
its own power down sequence: i.e. it  
gives the microprocessor the flexibility  
to perform housekeeping functions  
before it powers down.  
Low Dropout Voltage  
(1.25V @ 500mA)  
■
■
Basic regulator performance character-  
istics include a low noise, low drift, 5V  
± 4% precision output voltage with low  
dropout voltage (1.25V @ IOUT = 500mA)  
and low quiescent current (7mA @ IOUT  
= 500mA). On board short circuit, ther-  
mal, and overvoltage protection make it  
possible to use this regulator in particu-  
larly harsh operating environments.  
Low Quiescent Current  
(7mA @ 500mA)  
Low Noise, Low Drift  
■
■
Low Current SLEEP Mode  
(IQ = 250µA)  
Fault Protection  
Thermal Shutdown  
Short Circuit  
■
The Watchdog logic function monitors  
an input signal (WDI) from the micro-  
processor or other signal source. When  
the signal frequency moves outside  
externally programmable window lim-  
signal is generated  
). An external capacitor  
(CDELAY) programs the watchdog win-  
dow frequency limits as well as the  
60V Peak Transient  
Voltage  
Package Options  
24 Lead SOIC Wide  
RESET  
RESET  
its, a  
(
The CS8141 has the same features as the  
CS8140, except that the CS8141 only  
responds to input signals (WDI) which  
are below the preset watchdog frequen-  
cy threshold.  
1
NC  
Delay  
WDI  
RESET  
ENABLE  
RESET  
power on reset (POR) and  
delay.  
NC  
V
OUT  
V
IN  
RESET  
The  
function is activated by any  
Sense  
NC  
Gnd  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
Block Diagram  
NC  
NC  
V
IN  
NC  
NC  
Overvoltage  
Overtemperature  
Reference  
& Bias  
NC  
Gnd  
Regulation  
14 Lead PDIP  
7 Lead TO-220  
ENABLE  
WDI  
Control Logic  
ENABLE  
RESET  
Tab (Gnd)  
1
Delay  
RESET  
V
OUT  
WDI  
ENABLE  
Delay  
Short Circuit  
Undervoltage  
*NOTE: shorted together  
on 7 Lead TO-220  
1
2
3
4
5
6
7
VIN  
*
V
V
IN  
OUT  
ENABLE  
RESET  
Gnd  
Delay  
WDI  
Sense  
Sense  
Gnd  
NC  
NC  
NC  
Gnd  
Watchdog  
NC  
NC  
NC  
RESET  
VOUT  
Delay  
1
Cherry Semiconductor Corporation  
2000 South County Trail, East Greenwich, RI 02818  
Tel: (401)885-3600 Fax: (401)885-5786  
Email: info@cherry-semi.com  
Web Site: www.cherry-semi.com  
Rev. 2/23/99  
1
A
¨
Company  
1234567...12

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 		5V, 500mA Linear Regulator with ENABLE, , and Watchdog RESET

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