CM1581
5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
GENERAL DESCRIPTION
The CM1581 is a high performance low dropout regulator
rated for 5A output current with fixed 1.8V/2.5V/3.3V/5.0V and
adjustable output. It is designed for use in applications
requiring low dropout characteristics over the rated current
range.
When the second low-current input voltage is applied, the
dropout voltage can be as low as 100mV at light loads and up
to 500mV at maximum output current. On chip trimming
adjusts the reference voltage to 1%. These features are ideal
for low voltage microprocessor applications requiring a
regulated 1.8V to 3.6V power supply.
In addition, the CM1581 provides the device protections
including over current and thermal shutdown. The CM1581
series are ideal to the next generation microprocessor on
motherboards where both 5V and 3.3V are available.
!
!
!
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FEATURES
!
Input-Output differential of typical 500mV at 5A and low
quiescent current
Output Current is excess of 5A
Remote sense pin available
Reverse battery protection
Short Circuit Protection
Internal Thermal Overload Protection
5L TO-220 and 5L TO-263 package available
APPLICATIONS
!
!
!
Power Supplies
Computer Add-On Cards
Other Applications Requiring Low Dropout Voltage Over
Rated Current
PIN CONFIGURATION
TO-220
Top View
TO-263
Top View
V
PO W ER
V
CONTROL
GND/ADJ
V
CONTROL
SENSE
V
POWER
5
4
3
2
1
V
OUT
G N D /A D J
SENSE
V
OUT
1 2
3
4
5
2002/02/05
Preliminary
Rev. 1
Champion Microelectronic Corporation
Page 1
CM1581
5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
ORDERING INFORMATION
Package Type
TO-220
CM1581DCN220
CM1581KCN220
CM1581SCN220
CM1581ZJCN220
CM1581CN220
TO-263
CM1581DCN263
CM1581KCN263
CM1581SCN263
CM1581ZJCN263
CM1581CN263
Operating Temperature
Range (T
A
)
0℃ ~ +70℃
0℃ ~ +70℃
0℃ ~ +70℃
0℃ ~ +70℃
0℃ ~ +70℃
Output Voltage
1.8V
2.5V
3.3V
5.0V
ADJ.
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vpower) …….………………………………………….……. +13V
Input Voltage (Vcontrol) …….………………………………………….……. +13V
Operating Junction Temperature Range, T
J
……………...… 0℃ to +150℃
Storage Temperature ………………………………….….…... -65℃ to +150℃
Lead Temperature (10 sec.) ……..……………………..….…………….... 300℃
POWER DISSIPATION TABLE
Package
TO-220
TO-263
Θ
JA
(℃/W)
℃
45
45
Derating factor (mW/℃)
℃
T
A
>= 25℃
℃
22.2
22.2
T
A
<= 25℃
℃
Power rating (mW)
2775
2775
T
A
= 70℃
T
A
= 85℃
℃
℃
Power rating (mW) Power rating (mW)
1776
1443
1776
1443
Note:
1.
Θ
JA
: Thermal Resistance-Junction to Ambient, D
F
: Derating factor, P
O
: Power consumption.
2.
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
Θ
JA
), P
O
= D
F
x (T
J
– T
A
)
The
Θ
JA
numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
Θ
JT
: Thermal Resistance-Junction to Ambient, T
C
: case (Tab) temperature, T
J
= T
C
+ (P
D
x
Θ
JC
)
RECOMMENDED OPERATING CONDITIONS
Parameter
Input Voltage (V
IN
)
Load Current (with adequate heatsinking)
Input Capacitor (V
IN
to GND)
Output Capacitor with ESR of 10Ω max. (V
OUT
to GND)
Symbol
V
POWER
V
CONTROL
I
O
Min.
2
2.75
10
10
33
Typ.
Max
7
12
Units
V
V
mA
µF
µF
2002/02/05
Preliminary
Rev. 1
Champion Microelectronic Corporation
Page 2
CM1581
5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
BLOCK DIAGRAM
CM1581 Fixed Output Voltage Block Diagram
CM1581 Adjustable Output Voltage block Diagram
2002/02/05
Preliminary
Rev. 1
Champion Microelectronic Corporation
Page 3
CM1581
5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
OUT
= 0mA, and T
J
= +25℃; unless otherwise noted
CM1581
Min.
1.792
2.474
3.267
4.950
1.771
I
OUT
= 5A
2.460
3.247
4.920
1.238
1.230
Typ.
1.800
2.500
3.300
5.000
1.800
2.500
3.300
5.000
1.250
1.250
0.04
0.08
1.00
1.15
0.10
0.45
50
80
5.1
6.8
5
60
80
0.003
10
Max.
1.818
2.525
3.333
5.050
1.829
2.540
3.353
5.080
1.262
1.270
0.20
0.3
1.15
1.30
0.17
0.50
120
135
Parameter
Device
CM1581D
Output Voltage
CM1581K
CM1581S
CM1581ZJ
CM1581D
Output Voltage
CM1581K
CM1581S
CM1581ZJ
Reference Voltage
CM1581(adj)
Test Conditions
V
CONTROL
= 3.3V, V
POWER
= 2.5V
V
CONTROL
= 5.0V, V
POWER
= 3.3V
V
CONTROL
= 5.8V, V
POWER
= 3.8V
V
CONTROL
= 7.5V, V
POWER
= 5.5V
V
CONTROL
= 3.3V, V
POWER
= 2.5V
V
CONTROL
= 5.0V, V
POWER
= 3.3V
V
CONTROL
= 5.0V, V
POWER
= 4.1V
V
CONTROL
= 6.5V, V
POWER
= 5.8V
V
CONTROL
= 5.0V, V
POWER
= 3.3V (note1)
V
CONTROL
= (V
OUT
+ 1.5V) to 12V, V
POWER
= (V
OUT
+
0.8V) to 7V, I
OUT
= 10mA to 5A
Line Regulator (note 2)
Load Regulation (note 2)
Dropout Voltage (Note 3)
V
CONTROL
- V
OUT
Dropout Voltage (Note 3)
V
POWER
- V
OUT
Adjust Pin Current
Control Pin Current
Current Limit
Minimum Load Current (Note 4)
Ripple Rejection (Note 5)
Thermal Regulation
Note 1:
Output voltage is set to be 2.5V.
Note 2:
Line and load regulations are guaranteed up to maximum power dissipation determined by input/output differential and
the output current. However, the maximum power will not be available over the full input/output voltage range.
Note 3:
The specifications represent the minimum input/output voltage required to maintain 1% regulation.
Note 4:
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 5:
These parameters, although guaranteed, are not tested in production prior to shipment.
1.5V+ V
OUT
<= V
CONTROL
<= 12V,
0.8V<= V
POWER
- V
OUT
<= 5.5V
V
CONTROL
= V
OUT
+ 2.5V, V
POWER
= V
OUT
+ 0.8V,
I
OUT
= 10mA to 5A
V
POWER
= V
OUT
+ 0.8V
V
CONTROL
= V
OUT
+ 2.5V
I
OUT
= 10mA
I
OUT
= 5A
I
OUT
= 10mA
I
OUT
= 5A
Unit
V
V
V
V
V
V
V
V
V
V
%
%
V
V
µA
mA
A
mA
dB
%/W
V
CONTROL
= 2.75V, V
POWER
= 2.05V,
I
OUT
= 10mA
V
CONTROL
= V
OUT
+ 2.5V, V
POWER
= V
OUT
+ 0.8V,
I
OUT
= 10mA to 5A
(V
IN
– V
OUT
) = 1.5V
V
CONTROL
= 5.0V, V
POWER
= 3.3V
V
CONTROL
= V
POWER
= V
OUT
+ 2.5V,
V
RIPPLE
= 1V
PP
, I
OUT
= 2.5A
T
A
= 25℃
2002/02/05
Preliminary
Rev. 1
Champion Microelectronic Corporation
Page 4
CM1581
5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
APPLICATION CIRCUIT
CM1581 Fixed Output Voltage Application Circuit
CM1581 Adjustable Output Voltage Application Circuit
2002/02/05
Preliminary
Rev. 1
Champion Microelectronic Corporation
Page 5
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