CS8129 Datasheet, PDF (1/8 Pages) Cherry Semiconductor Corporation – 5V, 750mA Low Dropout Linear Regulator with Lower RESET Threshold

CS8129
5V, 750mA Low Dropout Linear
Regulator with Lower RESET Threshold
Description
The CS8129 is a precision 5V linear reg-
ulator capable of sourcing 750mA.
The RESET threshold voltage has been
lowered to 4.2V so that the regulator
can be used with 4V microprocessors.
The lower RESET threshold also per-
mits operation under low battery condi-
tions (5.5V plus a diode). The RESET Õs
delay time is externally programmed
using a discrete RC network. During
power up, or when the output goes out
of regulation, RESET 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
the Delay and the RESET comparators
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 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).
The CS8129 is packaged in a 5 lead
TOÐ220 and a 16 lead surface mount
package.
Block Diagram
Features
s 5V +/- 3% Regulated
Output
s Low Dropout Voltage
(0.6V @ 0.5A)
s 750mA Output Current
Capability
s Reduced RESET Threshold
for use with 4V Micro-
processors
s Externally Programmed
RESET Delay
s Fault Protection
Reverse Battery
60V, -50V Peak Transient
Voltage
Short Circuit
Thermal Shutdown
Over Voltage
Shutdown
Delay
Pre-
Regulated Supply
Regulator for Circuit Bias
Bandgap
Reference
Charge
Current
Generator
Thermal
Shutdown
Latching Discharge
QS
R
Error
Amplifier
Anti-Saturation
and
Current Limit
V_IN
V_OUT
V_OUTSENSE
Package Options
16 Lead SOIC Wide
V_IN 1
NC
NC
Gnd
Gnd
RESET
NC
Delay
V_OUT
NC
V_OUT(SENSE)
Gnd
Gnd
Gnd
NC
NC
5 Lead TO-220
Gnd
VDISCHARGE
Rev. 3/31/99
+ Delay Comparator
-
RESET
1
1 V_IN
2 RESET
3 Gnd
4 Delay
5 V_OUT
1
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: [phone] Fax: [phone]
Email: [e-mail]
Web Site: www.cherry-semi.com
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¨ Company