Cherry Semiconductor CS5203-1GT3, CS5203-1GDPR3, CS5203-1GDP3 Datasheet
1
Features
■ Output Current to 3A
■ Output Accuracy to ± 1.5%
Over Temperature
■ Dropout Voltage (typical)
1.2V @ 3A
■ Fast Transient Response
■ Fault Protection
Current Limit
Thermal Shutdown
Package Options
3L TO-220
Tab (V
OUT
)
CS5203 -1
3A Adjustable Linear Regulator
1
CS5203-1
The CS5203-1 linear regulator provides 3A at adjustable output voltages with an accuracy of ±1.5%.
The device uses two external resistors to set the output voltage within a 1.25V to 5.5V range.
The regulator is intended for use as
a post regulator and microprocessor supply. The fast loop response
and low dropout voltage make this
regulator ideal for applications
where low voltage operation and
good transient response are important.
The circuit is designed to operate
with dropout voltage less than 1.4V
at 3A output current. Device protection includes overcurrent and
thermal shutdown.
The CS5203-1 is pin compatible
with the LT1085 family of linear
regulators but has lower dropout
voltage.
The regulator is available in TO-220
and surface mount D2packages.
CS5203 -1
1 Adj
2V
OUT (Tab)
3V
IN
Description
3L D2PAK
Tab (V
OUT
)
1
Consult factory for fixed output
voltage versions.
Application Diagram
A Company
¨
Rev. 9/17/97
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
5.0V
V
IN
V
OUT
3.3V @ 3A
22mF
5V
10mF
5V
CS5203-1
Adj
0.1mF
5V
124W
1%
200W
1%
Note 1: Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing. Changes in out-
put voltage due to temperature changes must be taken into account separately.
Note 2: Specifications apply for an external Kelvin sense connection at a point on the output pin 1/4Ó from the bottom of the package.
Note 3: Dropout voltage is a measurement of the minimum input/output differential at full load.
Note 4: Minimum load current is defined as the minimum output current required to maintain regulation. The reference resistor in the output
divider is usually sized to fulfill the minimum load current requirement.
Note5: Guaranteed by design, not 100% functionally tested in production.
Note 6: Guaranteed by design, not 100% parametrically tested in production. However, every part is subject to functional testing for thermal
shutdown.
2
CS5203 -1
Absolute Maximum Ratings
Supply Voltage, V
IN
.....................................................................................................................................................................7V
Operating Temperature Range................................................................................................................................-40¡C to 70¡C
Junction Temperature ............................................................................................................................................................150¡C
Storage Temperature Range ..................................................................................................................................-60¡C to 150¡C
ESD Damage Threshold............................................................................................................................................................2kV
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
Package Pin Description
PACKAGE PIN # PIN SYMBOL FUNCTION
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Electrical Characteristics: C
IN
= 10µF, C
OUT
= 22µF Tantalum, V
OUT
+ V
DROPOUT
< VIN< 7V, 0¡C ² TA ² 70¡C, TJ² +150¡C,
unless otherwise specified, I
full load
= 3A.
■ Adjustable Output Voltage (CS5203-1)
Reference Voltage VINÐV
OUT
=1.5V; V
Adj
= 0V 1.235 1.254 1.273 V
(Notes 1 and 2) 10mA²I
OUT
²3A (-1.5%) (+1.5%)
Line Regulation 2V²VINÐV
OUT
²5.75V; I
OUT
=10mA 0.02 0.20 %
Load Regulation VINÐV
OUT
=2V; 10mA²I
OUT
²3A 0.04 0.4 %
(Notes 1 and 2)
Dropout Voltage (Note 3) I
OUT
=3A 1.15 1.40 V
Current Limit VINÐV
OUT
=3V; TJ³ 25¡C 3.1 4.6 A
Minimum Load Current (Note 4) VIN=7V; V
adj
=0 0.6 2.0 mA
Adjust Pin Current VINÐV
OUT
=3V; I
OUT
=10mA 50 100 µA
Thermal Regulation (Note 5) 30ms pulse; TA=25¡C 0.002 0.020 %/W
Ripple Rejection (Note 5) f=120Hz; I
OUT
=3A; VINÐV
OUT
=3V; 80 dB
V
RIPPLE
=1V
PP
Thermal Shutdown (Note 6) 150 180 210 ¡C
Thermal Shutdown Hysteresis (Note 6) 25 ¡C
D
2
PAK TO-220
1 1 Adj Adjust pin (low side of the internal reference).
22 V
OUT
Regulated output voltage (case)
33 VINInput voltage.
CS5203 -1
3
Dropout Voltage vs. Output Current Bandgap Reference Voltage Deviation vs. Temperature
Minimum Load Current vs VIN-V
OUT
Typical Performance Characteristics
Block Diagram
Ripple Rejection vs. Frequency
V
OUT
V
IN
Output
Current
Limit
Thermal
Shutdown
-
+
Amplifier
Error
1.20
1.15
1.10
1.05
1.00
0.95
0.90
Dropout Voltage (V)
0.85
0.80
0.75
0.00 3.00
T
CASE
T
CASE
= 25°C
= 0°C
Output Current (A)
T
= 125°C
CASE
Bandgap
Reference
2.702.402.101.801.501.200.900.600.30
+0.3
+0.2
+0.1
0
-0.1
Reference Voltage Deviation (%)
-0.2
-0.3
030
Adj
60 90 120
TJ (°C)
90.00
80.00
70.00
60.00
50.00
40.00
Ripple Rejection (dB)
30.00
20.00
10.00
1
10
2
10
3
10
Frequency (Hz)
4
10
5
10
6
10
0.65
0.60
T
0.55
T
= 25°C
CASE
0.50
0.45
Minimum Load Current (mA)
0.40
1.00
2.00
3.00
CASE
= 0°C
4.00 5.00
VIN – V
OUT
(V)
T
CASE
6.00
= 125°C
7.00
8.00
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