CS8120
5V, 300mA Linear Regulator with
and
ENABLE
RESET
Description
Features
The CS8120 is a 5V, 300mA precision
5V ± 4% Output Voltage
300mA
■
RESET
signal when the IC is power-
ing up or whenever the output voltage
linear regulator with two microproces-
sor compatible control functions and
protection circuitry included on chip.
The composite NPN-PNP output pass
transistor assures a lower dropout volt-
age (1V @ 200mA) without requiring
excessive supply current (2.5mA).
RESET
moves out of regulation. The
signal is valid down to VOUT = 1V.
■ Low Dropout Voltage
(1V @ 150mA)
The CS8120 design optimizes supply
rejection by switching the internal
bandgap reference from the supply
input to the regulator output as soon as
the nominal output voltage is achieved.
Additional on chip filtering enhances
rejection of high frequency transients
on all external leads.
■ Low Quiescent Current
(2.5mA @ IOUT = 150mA)
The CS8120Õs two logic control func-
tions make this regulator well suited to
applications requiring microprocessor-
based control at the board or module
■ µP Compatible Control
Functions
RESET
ENABLE
ENABLE
level.
stage. A high voltage (>2.9V) on the
ENABLE
controls the output
The CS8120 is fault protected against
short circuit, over voltage and thermal
runaway conditions.
■ Low Current Sleep Mode
lead turns off the regula-
IQ=250µA
torÕs pass transistor and sends the IC
into Sleep mode where it draws only
■ Fault Protection
Thermal Shutdown
Short Circuit
RESET
250µA. The
function sends a
Block Diagram *
60V Load Dump
Package Options
14 Lead SOIC
Narrow
5 Lead TO-220
Tab (Gnd)
VOUT
V
1
V
OUT
IN
VIN
Gnd
NC
NC
NC
SENSE
Over
Voltage
Shutdown
NC
Output
Current
Limit
ENABLE
NC
RESET
NC
ENABLE
Comparator
-
ENABLE
Bandgap
Supply
+
NC
NC
-
+
Error
Amplifier
8 Lead PDIP
1
V
REF
Thermal
Shutdown
1
VOUT
VIN
Gnd
SENSE
RESET
NC
Bandgap
TO VOUT
Reference
ENABLE
NC
5 Lead D2 PAK
RESET
Comparator
RESET
+
-
1
2
3
4
5
VIN
ENABLE
Gnd
Gnd
RESET
VOUT
1
* TO-220 Block Diagram
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. 2/3/98
1
A
¨
Company