CS8122 Datasheet, PDF (1/8 Pages) Cherry Semiconductor Corporation – 2% 5V, 750mA Low Dropout Linear Regulator with Delayed RESET

CS8122
2% 5V, 750mA Low Dropout Linear
Regulator with Delayed RESET
Description
The CS8122 is a precision 5V linear reg-
ulator capable of sourcing in excess of
750mA. The RESETÕs delay time is
externally programmed using a discrete
RC network. During power up, or when
the output goes out of regulation, the
RESET lead remains in the low state
for the duration of the delay. This func-
tion is independent of the input voltage
and will function correctly 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 CS8122 is an improved replacement
for the CS8126 and features a tighter tol-
erance on its output voltage (2% vs 4%).
The CS8122 is packaged in a 5 lead
TOÐ220 with copper tab. The copper tab
can be connected to a heat sink if
necessary.
Features
s 5V +/- 2% Regulated
Output
s Low Dropout Voltage
(0.6V @ 0.5A)
s 750mA Output Current
Capability
s Externally Programmed
RESET Delay
s Fault Protection
Reverse Battery
60V Load Dump
-50V Reverse Transient
Short Circuit
Thermal Shutdown
Block Diagram
Over Voltage
Shutdown
Delay
Gnd
Pre-
Regulator
Regulated Supply
for Circuit Bias
Bandgap
Reference
Charge
Current
Generator
Thermal
Shutdown
Latching Discharge
QS
R
VDISC
Error Amplifier
Anti-Saturation
and
Current Limit
Delay Comparator
+
-
V_IN
V_OUT
V_OUTSENSE
RESET
Package Options
5 Lead TO-220
1 V_IN
2 V_OUT
3 Gnd
4 Delay
5 RESET
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Rev. 2/5/99
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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