CS8122 Cherry Semiconductor Corporation, CS8122 Datasheet

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CS8122

Manufacturer Part Number
CS8122
Description
2% 5V/ 750mA Low Dropout Linear Regulator with Delayed RESET
Manufacturer
Cherry Semiconductor Corporation
Datasheet

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Rev. 2/5/99
Delay
Gnd
The CS8122 is a precision 5V linear reg-
ulator capable of sourcing in excess of
750mA. The
externally programmed using a discrete
RC network. During power up, or when
the output goes out of regulation, the
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
improve noise immunity. A latching
discharge circuit is used to discharge
the delay capacitor when it is triggered
by a brief fault condition.
RESET
2% 5V, 750mA Low Dropout Linear
RESET
lead remains in the low state
Regulator
Pre-
Charge
Current
Generator
RESET
Regulator with Delayed RESET
Latching Discharge
VDISC
comparators to
+
-
Regulated Supply
Õs delay time is
for Circuit Bias
Q
S
R
Description
Reference
Shutdown
Bandgap
Thermal
Block Diagram
Over Voltage
+
-
Shutdown
Error Amplifier
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.
+
-
CS8122
Delay Comparator
+
-
Anti-Saturation
Current Limit
and
1
V
V
V
RESET
IN
OUT
OUT
SENSE
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Cherry Semiconductor Corporation
Web Site: www.cherry-semi.com
5V +/- 2% Regulated
Output
Low Dropout Voltage
(0.6V @ 0.5A)
750mA Output Current
Capability
Externally Programmed
Fault Protection
Email: info@cherry-semi.com
RESET
Package Options
Reverse Battery
60V Load Dump
-50V Reverse Transient
Thermal Shutdown
Short Circuit
1
Features
5 Lead TO-220
Delay
A
1 V
2 V
3 Gnd
4 Delay
5 RESET
¨
Company
IN
OUT

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CS8122 Summary of contents

Page 1

... 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 lead TOÐ220 with copper tab. The copper tab can be connected to a heat sink if necessary. V ...

Page 2

Input Operating Range..................................................................................................................................................-0.5 to 26V Power Dissipation.............................................................................................................................................Internally Limited Transient Input Voltage .................................................................................................................................................-50V, 60V Output Current .................................................................................................................................................Internally Limited ESD Susceptibility (Human Body Model)..............................................................................................................................4kV Junction Temperature .............................................................................................................................................-55¡C to 150¡C Storage Temperature...............................................................................................................................................-55¡C to 150¡C Lead Temperature Soldering Wave Solder (through hole styles only) ...

Page 3

PACKAGE LEAD # LEAD SYMBOL 5Lead TO-220 Quiescent Current vs Input Voltage over Temperature 55 25W load 50.0 45.0 40.0 35.0 30.0 125ûC 25.0 20.0 15.0 25ûC 10.0 -40ûC 5.0 0.0 0.0 1.0 ...

Page 4

Typical Performance Characteristics: continued Line Regulation vs. Output Current 100 6-26V IN 40 TEMP = 25ûC 20 TEMP = - 40ûC 0 -20 -40 -60 -80 -100 0 100 200 300 400 500 OUTPUT CURRENT (mA) Dropout ...

Page 5

... V RT(OFF) RESET (3) Delay V DC(HI) V DC(LO) The CS8122 RESET function, has hysteresis on both the reset and delay comparators, a latching Delay capacitor discharge circuit, and operates down to 1V. RESET The circuit output is an open collector type with ON and OFF parameters as specified. The NPN transistor is controlled by the two circuits described (see Block Diagram) ...

Page 6

Stability Considerations The output or compensation capacitor helps determine three main characteristics of a linear regulator: start-up delay, load transient response and loop stability. The capacitor value and type should be based on cost, availability, size and temperature constraints. A ...

Page 7

Heat Sinks A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC and into the surrounding air. Each material in the heat flow path between the IC and the ...

Page 8

... TYP 1.70 (.067) 6.81(.268) Ordering Information Part Number Description CS8122YT5 5 Lead TO-220 Straight CS8122YTHA5 5 Lead TO-220 Horizontal CS8122YTVA5 5 Lead TO-220 Vertical Rev. 2/5/99 Package Specification Thermal Data 1.40 (.055) 1.14 (.045) 4.83 (.190) 4.06 (.160) 14.99 (.590) 14.22 (.560) 6.55 (.258) 5 ...

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