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Cherry Semiconductor Corporation
Cherry Semiconductor Corporation

CS8321 Datasheet Preview

CS8321 Datasheet

Micropower 5V/ 150mA Low Dropout Linear Regulator

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CS8321 pdf
CS8321
Micropower 5V, 150mA Low Dropout
Linear Regulator
Description
Features
The CS8321 is a precision 5V
micropower voltage regulator with
very low quiescent current (140µA
typ at 1mA load). The 5V output is
accurate within ±2% and supplies
150mA of load current with a typi-
cal dropout voltage of only 300mV.
This combination of low quiescent
current and outstanding regulator
performance makes the CS8321
ideal for any battery operated
equipment.
The regulator is protected against
reverse battery and short circuit
conditions. The device can with-
stand 45V load dump transients
making it suitable for use in auto-
motive environments.
Absolute Maximum Ratings
Transient Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-15V, 45V
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Internally Limited
ESD Susceptibility (Human Body Model) . . . . . . . . . . . . . . . . . . . . . . . . . .2kV
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40¡C to 150¡C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65C to 150¡C
Lead Temperature Soldering
Wave Solder (through hole styles only) . . . . . . . .10 sec. max, 260¡C peak
Reflow (SMD styles only) . . . . . . . .60 sec. max above 183¡C, 230¡C peak
s 5V ±2% Output
s Low 140µA (typ)
Quiescent Current
s 150mA Output Current
Capability
s Fault Protection
-15V Reverse Voltage
Output Current Limit
s Low Reverse Current
(Output to Input)
Package Options
Block Diagram
3L TO-220
VIN
Current Source
(Circuit Bias)
QP
R
QN
Current Limit
Sense
+ - Error
Amplifier
Bandgap
Reference
*Note: Lead shorted to VOUT in 3 pin applications
R1
R2
Rev. 11/25/96
1
VOUT
1. VIN
2. Gnd
3. VOUT
VOUTSense*
1
3L D2PAK
1. VIN
2. Gnd
3. VOUT
1
Other Packages: 16L SO, 16L PDIP,
Gnd 8L SO, 8L PDIP, (consult factory)
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
A ¨ Company



Cherry Semiconductor Corporation
Cherry Semiconductor Corporation

CS8321 Datasheet Preview

CS8321 Datasheet

Micropower 5V/ 150mA Low Dropout Linear Regulator

No Preview Available !

CS8321 pdf
Electrical Characteristics: 6V < VIN < 26V, IOUT=1mA, -40¡C ² TA ² 125¡C, -40¡C ² TJ ² 150¡C unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s Output Stage
Output Voltage, VOUT
9V < VIN < 16V,
100µA ² IOUT ² 150mA
4.90 5.00
Dropout Voltage (VIN-VOUT)
IOUT = 150mA, -40¡C ² TA ² 85¡C
IOUT = 150mA, TA = 125¡C
0.3
Quiescent Current, (IQ)
IOUT = 1mA @ VIN = 13V
IOUT < 50mA @ VIN = 13V
IOUT < 150mA @ VIN = 13V
4
15
Load Regulation
VIN = 14V, 100µA < IOUT < 150mA
5
Line Regulation
6V < V < 26V, IOUT = 1mA
5
Ripple Rejection
7 Ð VIN Ð 17V, IOUT = 150mA,
f = 120Hz
60 75
Current Limit
175 250
Short Circuit Output Current VOUT = 0V
Reverse Current
VOUT = 5V, VIN = 0V
60 200
140
5.10 V
0.5 V
0.6 V
200 µA
6 mA
25 mA
50 mV
50 mV
dB
mA
mA
200 µA
PACKAGE LEAD #
3L D2PAK
3L TO-220
11
22
33
Package Lead Description
LEAD SYMBOL
FUNCTION
VIN
Gnd
VOUT
Input Voltage
Ground. All Gnd leads must be connected to Ground.
5V, ±2%, 150mA Output.
Circuit Description and Application Notes
Voltage Reference and Output Circuitry
The CS8321 is a series pass voltage regulator. It consists of
an error amplifier, bandgap voltage reference, PNP pass
transistor with antisaturation control, and current limit.
As the voltage at the input, VIN, is increased, QN is for-
ward biased via R. QN provides base drive for QP. As QP
becomes forward biased, the output voltage, VOUT, begins
to rise as QPÕs output current charges the output capacitor.
Once VOUT rises to a certain level, the error amplifier
becomes biased and provides the appropriate amount of
base current to QP. The error amplifier monitors the scaled
output voltage via an internal voltage divider, R1 and R2,
and compares it to the bandgap voltage reference. The
error amplifierÕs output is a current which is equal to the
error amplifierÕs differential input voltage times its
transconductance. Therefore, the error amplifier varies the
base drive current to QN, which provides bias to QP, based
on the difference between the reference voltage and the
scaled output voltage, VOUT.
Antisaturation Protection
An antisaturation control circuit has also been added to
prevent the pass transistor from going into deep satura-
tion, which would cause excessive power dissipation due
to large bias currents lost to the substrate via a parasitic
PNP transistor, as shown in Figure 1.
VIN
QP
QParasitic
Substrate
VOUT
Figure 1. The parasitic PNP transistor which is part of the pass transis-
tor (QP) structure.
2


Part Number CS8321
Description Micropower 5V/ 150mA Low Dropout Linear Regulator
Maker Cherry Semiconductor Corporation
Total Page 6 Pages
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