CS8126,-1,-2
5V, 750mA Low Dropout Linear Regulator
with Delayed RESET
Description
Features
The CS8126 is a low dropout, high cur-
rent 5V linear regulator. It is an
state for the duration of the delay.
Types of errors include short circuit,
low input voltage, overvoltage shut-
down, thermal shutdown, or others that
cause the output to become unregulat-
ed. This function is independent of the
input voltage and will function correct-
ly with an output voltage as low as 1V.
Hysteresis is included in both the reset
and Delay comparators for enhanced
noise immunity. A latching discharge
circuit is used to discharge the Delay
capacitor, even when triggered by a rel-
atively short fault condition. This circuit
improves upon the commonly used
SCR structure by providing full capaci-
tor discharge (0.2V type).
■ Low Dropout Voltage
(0.6V at 0.5A)
improved replacement for the CS8156.
Improvements include higher accuracy,
tighter saturation control, better supply
rejection, and enhanced RESET circuit-
ry. Familiar PNP regulator features
such as reverse battery protection, over-
voltage shutdown, thermal shutdown,
and current limit make the CS8126 suit-
able for use in automotive and battery
operated equipment. Additional on-
chip filtering has been included to
enhance rejection of high frequency
transients on all external leads.
■ 3% Output Accuracy
RESET
■ Active
■ External
for Reset
RESET
Delay
■ Protection Circuitry
Reverse Battery
Protection
+60V, -50V Peak
Transient Voltage
Short Circuit Protection
An active microprocessor RESET func-
tion is included on-chip with externally
programmable delay time. During
power-up, or after detection of any
error in the regulated output,
Internal Thermal
Overload Protection
Note:The CS8126 is lead compatible
with the LM2925, TLE4260, L4947,
LM2927, and LM2926.
Package Options
the RESET lead will remain in the low
16 Lead SOIC Wide
1
V
V
Block Diagram
IN
OUT
NC
NC
NC
NC
NC
V
OUT(SENSE)
NC
NC
V
IN
ÐÐÐÐÐÐ
RESET
Gnd
NC
Over Voltage
Shutdown
NC
V
OUT
Delay
NC
7 L D2PAK
Tab (Gnd)
5 L TO-220
Tab (Gnd)
Pre-
Regulator
Regulated Supply
for Circuit Bias
Error
Amp
Bandgap
Reference
-
Anti-Saturation
and
Current Limit
+
Charge
Current
Thermal
Generator
Shutdown
1
Latching
1
2
3
4
5
6
7
VIN
VOUT
VOUT(SENSE)
Gnd
Delay
RESET
NC
Discharge
Delay
-
Q
S
R
+
Reset
Comparator
-
1
+
CS8126-1
CS8126-2
Delay
Comparator
1
2
3
4
5
VIN
1
2
3
4
5
VIN
RESET
Gnd
Delay
VOUT
VDischarge
+
-
RESET
VOUT
Gnd
Delay
RESET
Gnd
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. 5/4/99
1
A
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Company