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CS8161 Datasheet(PDF) 6 Page - Cherry Semiconductor Corporation

Part No. CS8161
Description  12V, 5V Low Dropout Dual Regulator with ENABLE
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Maker  CHERRY [Cherry Semiconductor Corporation]
Homepage  http://www.cherrycorp.com/
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CS8161 Datasheet(HTML) 6 Page - Cherry Semiconductor Corporation

   
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Since both outputs are controlled by the same ENABLE,
the CS8161 is ideal for applications where a sleep mode is
required. Using the CS8161, a section of circuitry such as a
display and nonessential 5V circuits can be shut down
under microprocessor control to conserve energy.
The example in the Applications Diagram shows an auto-
motive radio application where the display is powered by
the 12V on VOUT
1 and the Tuner IC is powered by the 5V
on VOUT
2. Neither output is required unless both the igni-
tion and the Radio On/Off switch are on.
The output compensation capacitor (Application diagram
C2 and C3) 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 tantalum
or aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR, can cause insta-
bility. The aluminum electrolytic capacitor is the least
expensive solution, but, if the circuit operates at low tem-
peratures (-25¡C to -40¡C), both the value and ESR of the
capacitor will vary considerably. The capacitor manufac-
turers data sheet usually provide this information.
The values for the output capacitors C2 and C3 shown in
the Applications Circuit should work for most applica-
tions, however it is not necessarily the best solution.
To determine an acceptable value for C2 and C3 for a par-
ticular application, start with tantalum capacitors of the
recommended value on each output and work towards
less expensive alternative parts for each output in turn.
6
CS8161
C1*
0.1
mF
ENABLE
VIN
VOUT
1
Gnd
C3**
22
mF
+
+
22
mF
C2**
VOUT
2
Display
Tuner
NOTES:
* C1 required if regulator is located far from power supply filter.
** C2, C3 required for stability, value may be increased. Capacitor must operate at minimum temperature expected.
Application Diagram
Stability Considerations
VIN
ENABLE
VOUT
1
System
Condition
60V
3V
2.4V
12V
0V
Turn
On
Load
Dump
Low VIN
Line Noise, Etc.
VOUT
1
Short
Circuit
Thermal
Shutdown
VOUT
1
Turn
Off
5V
0V
14V
5V
2.0V
0.8V
14V
26V
31V
12V
12V
2.4V
12V
12V
0V
0V
VOUT
2
0V
5V
0V
0V
VOUT
2
Short
Circuit
Typical Circuit Waveform
Application Notes


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