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CS8151C Datasheet(PDF) 1 Page - Cherry Semiconductor Corporation

Part No. CS8151C
Description  5V, 100mA Low Dropout Linear Regulator with Watchdog, RESET, & Wake Up
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Maker  CHERRY [Cherry Semiconductor Corporation]
Homepage  http://www.cherrycorp.com/
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CS8151C Datasheet(HTML) 1 Page - Cherry Semiconductor Corporation

   
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5V, 100mA Low Dropout Linear Regulator
with Watchdog, RESET, & Wake Up
The CS8151C is a precision 5V, 100mA
micro-power voltage regulator with
very low quiescent current (400µA typ-
ical at 200µA load). The 5V output is
accurate within ±1% and supplies 100
mA of load current with a typical
dropout voltage of 400mV.
Microprocessor control logic includes
Watchdog, Wake Up and
. This
unique combination of low quiescent
current and full microprocessor con-
trol makes the CS8151C ideal for use in
battery operated, microprocessor con-
trolled equipment.
The CS8151C Wake Up function brings
the microprocessor out of Sleep mode.
The microprocessor in turn, signals its
Wake Up status back to the CS8151C
by issuing a Watchdog signal.
The Watchdog logic function monitors
an input signal (WDI) from the micro-
processor. The CS8151C responds to
the falling edge of the Watchdog signal
which it expects at least once during
each wake-up period. When the cor-
rect Watchdog signal is received, a
falling edge is issued on the wake-up
signal line.
is independent of VIN and
operates correctly to an output voltage
as low as 1V. A
signal is issued
in any of three situations. During
power up the
is held low until
the output voltage is in regulation.
During operation if the output voltage
shifts below the regulation limits, the
toggles low and remains low
until proper output voltage regulation
is restored. And finally, a
signal
is issued if the regulator does not
receive a Watchdog signal within the
Wake Up period.
The
pulse width, Wake Up sig-
nal frequency, and Wake Up delay
time are all set by one external capaci-
tor CDelay.
The regulator is protected against
short circuit, over voltage, and thermal
runaway conditions. The device can
withstand 74 volt load dump tran-
sients, making it suitable for use in
automotive environments.
RESET
RESET
RESET
RESET
RESET
RESET
RESET
1
Features
Error
Amplifier
Thermal
Shutdown
VIN
Bandgap
Reference
+
-
Current Limit
Sense
Current Source
(Circuit Bias)
RESET
Over
Voltage
Shutdown
Timing
Circuit
WATCHDOG
Circuit
Falling Edge
Detector
Sense
VOUT
Gnd
Delay
WDI
RESET
Circuit
VOUT
VOUT
WAKE UP
WAKE UP
Circuit
s
5V ±1% / 100 mA Output
Voltage
s
Micropower Compatible
Control Functions:
Wake Up
Watchdog
s
Low Dropout Voltage:
400mV @ 100mA
s
Low Sleep Mode Quiescent
Current (400µA typ)
s
Protection Features:
Thermal Shutdown
Short Circuit
74V Load Dump
Reverse Transient (-50V)
RESET
Package Options
8 Lead PDIP
1
VIN
WDI
WAKE UP
RESET
Delay
N/C
Gnd
VOUT
CS8151C
Description
Block Diagram
A
Company
¨
Rev. 3/17/99
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


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