CS8129
5V, 750mA Low Dropout Linear
Regulator with Lower RESET Threshold
Description
Features
■ 5V +/- 3% Regulated
The CS8129 is a precision 5V linear reg-
ulator capable of sourcing 750mA.
RESET
RESET
the Delay and the
comparators
Output
to improve noise immunity. A latching
discharge circuit is used to discharge
the delay capacitor when it is triggered
by a brief fault condition.
The
threshold voltage has been
lowered to 4.2V so that the regulator
can be used with 4V microprocessors.
■ Low Dropout Voltage
(0.6V @ 0.5A)
RESET
The lower
mits operation under low battery condi-
RESET
threshold also per-
■ 750mA Output Current
The regulator is protected against a
variety of fault conditions: i.e. reverse
battery, overvoltage, short circuit and
thermal runaway conditions. The regu-
lator is protected against voltage tran-
sients ranging from -50V to +40V. Short
circuit current is limited to 1.2A (typ).
Capability
tions (5.5V plus a diode). The
Õs
delay time is externally programmed
using a discrete RC network. During
■ Reduced RESET Threshold
for use with 4V Micro-
processors
power up, or when the output goes out
RESET
of regulation,
remains in the
low state for the duration of the delay.
This function is independent of the
input voltage and will function correct-
ly as long as the output voltage remains
at or above 1V. Hysteresis is included in
■ Externally Programmed
The CS8129 is packaged in a 5 lead
TOÐ220 and a 16 lead surface mount
package.
RESET Delay
■ Fault Protection
Reverse Battery
60V, -50V Peak Transient
Voltage
Block Diagram
Short Circuit
Thermal Shutdown
Package Options
V
V
IN
Over Voltage
Shutdown
16 Lead SOIC Wide
OUT
1
VIN
NC
NC
VOUT
Regulated Supply
for Circuit Bias
Pre-
NC
Error
Regulator
VOUT(SENSE)
Gnd
Amplifier
Bandgap
Reference
-
Anti-Saturation
and
Current Limit
Gnd
Gnd
+
Gnd
Charge
V
Current
Thermal
Shutdown
OUT
SENSE
Gnd
RESET
NC
Generator
NC
NC
Delay
Latching Discharge
Delay
-
5 Lead TO-220
Q
S
R
+
-
+
VDISCHARGE
1
2
3
4
VIN
RESET
Delay Comparator
+
-
RESET
Gnd
Gnd
Delay
VOUT
5
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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. 3/31/99
A
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Company
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