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Cherry Semiconductor Corporation

CS5208-1 Datasheet Preview

CS5208-1 Datasheet

8A LDO 3-Pin Adjustable Linear Regulator

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CS5208-1
8A LDO 3-Pin Adjustable Linear Regulator
Description
Features
The CS5208-1 linear regulator pro-
vides 8A at adjustable voltages
from 1.25V to 4.5V. This adjustable
device requires two external resis-
tors to set the output voltage and
provide the minimum load current
for proper regulation.
This regulator is intended for use
as a post regulator and micropro-
cessor supply. The fast loop
response and low dropout voltage
make this regulator ideal for appli-
cations where low voltage opera-
tion and good transient response
are important.
The circuit is designed to operate
with dropout voltages as low as
1.0V at 8A.
The regulator is protected against
overload conditions with overcur-
rent and thermal shutdown
protection circuitry.
The regulator is available in a
TO-220 package.
s 1.25V to 4.5V VOUT at 8A
s Dropout Voltage < 1.0V @ 8A
s 1.5% Trimmed Reference
s Fast Transient Response
s Thermal Shutdown
s Current Limit
s Short Circuit Protection
Applications Diagram
5.0V
VIN VOUT
CS5208-1
Adj
100mF
0.1mF
3.3V @ 8A
124
Load
200
300mF
Package Options
3 Lead TO-220
1
1. Adjust
2. VOUT
3. VIN
Tab = VOUT
Rev. 6/11/97
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
1 A Company
¨




Cherry Semiconductor Corporation

CS5208-1 Datasheet Preview

CS5208-1 Datasheet

8A LDO 3-Pin Adjustable Linear Regulator

No Preview Available !

Absolute Maximum Ratings
Input Voltage ...............................................................................................................................................................................6V
Operating Junction Temperature Range ..........................................................................................................0¡C ² TJ ² 150¡C
Storage Temperature Range ...............................................................................................................................-65¡C to +150¡C
Lead Temperature Soldering: Wave Solder (through hole styles only).........................................10 sec. max, 260¡C peak
ESD Damage Threshold ...........................................................................................................................................................2kV
Electrical Characteristics: 0¡C²TA ² 70¡C, 0¡C²TJ ² 150¡C, VAdj = 0V unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Reference Voltage
VIN=2.75V to 5.5V, IOUT=10mA to 8A
Line Regulation
Load Regulation
Minimum Load Current
(Note 1)
Adjust Pin Current
Current Limit
Short Circuit Current
Ripple Rejection
(Note 2)
Thermal Regulation (Note 2)
Dropout Voltage
(Minimum VIN -VOUT)
(Note 3)
RMS Output Noise
Temperature Stability
Thermal Shutdown (Note 4)
Thermal Shutdown Hysteresis
(Note 4)
VIN=2.75V to 5.5V, IOUT=10mA
VIN=2.75V,IOUT=10mA to 8A
VIN=5V, ÆVOUT= +1.5%
VIN=2.75V,IOUT=10mA
VIN=2.75V,ÆVOUT= -1.5%
VIN=2.75V,VOUT=0V
VIN=3.25V Avg,
VRipple=1VP-P@120Hz,
IOUT=4A,CAdj=0.1µF; COUT = 22µF
30ms Pulse, TA=25¡C
IOUT=100mA
IOUT=1A
IOUT=2.75A
IOUT=4A
IOUT=8A
Freq=10Hz to 10kHz, TA=25¡C
1.234
(-1.5%)
8.1
6.0
60
150
1.253
.02
.04
5
70
9.0
8.5
80
0.002
0.92
0.93
0.94
0.95
0.96
0.003
0.5
180
25
1.271
(+1.5%)
.20
.50
10
V
%
%
mA
120 µA
A
A
dB
%/W
1.15 V
1.15 V
1.15 V
1.15 V
1.30 V
%VOUT
%
210 ¡C
¡C
Note 1: The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor
divider used to set the output voltage is selected to meet the minimum load current requirement.
Note 2: This parameter is guaranteed by design and is not 100% production tested.
Note 3: Dropout voltage is defined as the minimum input/output voltage differential required to maintain 1.5% regulation.
Note 4: This parameter is guaranteed by design, but not parametrically tested in production. However, a 100% thermal shutdown
functional test is performed on each part.
PACKAGE PIN #
3L TO-220
1
2
3
Package Pin Description
PIN SYMBOL
FUNCTION
Adjust
VOUT
VIN
This pin is connected to the low side of the internally trimmed 1.5%
bandgap reference voltage and carries a bias current of about 70µA.
A resistor divider from Adj to VOUT and from Adj to ground sets
the output voltage. Also, transient response can be improved by
adding a small bypass capacitor from this pin to ground.
This pin is connected to the emitter of the power pass transistor and
provides a regulated voltage capable of sourcing 8A of current.
This is the supply voltage for the regulator . For the device to regu-
late, this voltage should be between 1.1V and 1.30V (depending on
the output current) greater than the output voltage.
2


Part Number CS5208-1
Description 8A LDO 3-Pin Adjustable Linear Regulator
Maker Cherry Semiconductor Corporation
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CS5208-1 Datasheet PDF






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