CS8126 Datasheet, PDF (1/9 Pages) Cherry Semiconductor Corporation – 5V, 750mA Low Dropout Linear Regulator with Delayed RESET

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
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.
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,
the RESET lead will remain in the low
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).
Note:The CS8126 is lead compatible
with the LM2925, TLE4260, L4947,
LM2927, and LM2926.
Block Diagram
Over Voltage
Shutdown
Pre-
Regulator
Regulated Supply
for Circuit Bias
Bandgap
Reference
Charge
Current
Generator
Thermal
Shutdown
Error
Amp
Anti-Saturation
and
Current Limit
V_IN
V_OUT
s Low Dropout Voltage
(0.6V at 0.5A)
s 3% Output Accuracy
s Active RESET
s External RESET Delay
for Reset
s Protection Circuitry
Reverse Battery
Protection
+60V, -50V Peak
Transient Voltage
Short Circuit Protection
Internal Thermal
Overload Protection
Package Options
16 Lead SOIC Wide
V_IN 1
NC
V_OUT
NC
NC
V_OUT(SENSE)
NC
NC
NC
NC
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Gnd
NC
NC
Delay
NC
7 L D²PAK
Tab (Gnd)
5 L TO-220
Tab (Gnd)
Delay
Gnd
Latching
Discharge
QS
R
Reset
Comparator
V_Discharge
Delay
Comparator
+
-
RESET
1
1 V_IN
2 V_OUT
3 V_OUT(SENSE)
4 Gnd
5 Delay
6 RESET
7 NC
1
CS8126-1
1 V_IN
2 V_OUT
3 Gnd
4 Delay
5 RESET
CS8126-2
1 V_IN
2 RESET
3 Gnd
4 Delay
5 V_OUT
Rev. 5/4/99
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