CM1086
1.5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
GENERAL DESCRIPTION
The CM1086 is a high performance low dropout regulator
rated for 1.5A output current with fixed 2.5V/3.3V and
adjustable output. It is designed for use in applications
requiring low dropout characteristics over the rated current
range.
On chip trimming adjusts the reference voltage to 1%. These
features are ideal for low voltage microprocessor applications
requiring a regulated 2.5V to 3.6V power supply.
In addition, the CM1086 provides the device protections
including over current and thermal shutdown. Also, reverse
battery protection scheme limits the reverse current when the
input voltage falls below the output.
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FEATURES
!
Three Terminal Adjustable or Fixed Voltages: 2.5V, 3.3V,
and adjustable.
Output Current of 1.5A
Reverse Battery Protection
Fast Transient Response
Short Circuit Protection
Internal Thermal Overload Protection
TO-263 and TO-252 package available
APPLICATIONS
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!
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Power Supplies
Computer Add-On Cards
Other Applications Requiring Low Dropout Voltage Over
Rated Current
PIN CONFIGURATION
TO-252
Top View
TO-263
Top View
V IN
3
2
1
GND/ADJ
VO UT
VOUT
VIN
G N D /A DJ
1
2
3
ORDERING INFORMATION
Package Type
TO-252
CM1086KCN252
CM1086SCN252
CM1086CN252
TO-263
CM1086KCN263
CM1086SCN263
CM1086CN263
Operating Temperature
Range (T
A
)
0℃ ~ +70℃
0℃ ~ +70℃
0℃ ~ +70℃
Output Voltage
2.5V
3.3V
ADJ.
2002/02/05
Preliminary
Rev. 2
Champion Microelectronic Corporation
Page 1
CM1086
1.5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
ABSOLUTE MAXIMUM RATINGS
Input Voltage
…………….………………………………………….……. +13V
……………...… 0℃ to +150℃
Operating Junction Temperature Range, T
J
Storage Temperature ………………………………….….…... -65℃ to +150℃
Lead Temperature (10 sec.) ……..……………………..….…………….... 260℃
POWER DISSIPATION TABLE
Package
TO-252
TO-263
Θ
JA
(℃/W)
℃
80
45
Derating factor (mW/℃)
℃
℃
T
A
>= 25℃
12.5
22.2
T
A
<= 25℃
℃
Power rating (mW)
1562
2775
T
A
= 70℃
T
A
= 85℃
℃
℃
Power rating (mW) Power rating (mW)
1000
812
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
JA
)
RESOMMENDED OPERATING CONDITIONS
Parameter
Input Voltage
Load Current (with adequate heatsinking)
Input Capacitor (V
IN
to GND)
Output Capacitor with ESR of 10Ω max. (V
OUT
to GND)
Operating Ambient Temperature Range
Junction Temperature
Symbol
V
IN
I
O
Min.
2.7
10
1.0
10
0
Typ.
Max
12
Units
V
mA
µF
µF
℃
℃
T
J
70
125
APPLICATION CIRCUIT
Fixed Output Voltage Regulator
Adjustable Voltage Regulator
2002/02/05
Preliminary
Rev. 2
Champion Microelectronic Corporation
Page 2
CM1086
1.5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
BLOCK DIAGRAM
Fixed Output Voltage Regulator Schematic
Adjustable Voltage Regulator Schematic
2002/02/05
Preliminary
Rev. 2
Champion Microelectronic Corporation
Page 3
CM1086
1.5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
OUT
= 0mA, and T
J
= +25℃; unless otherwise noted
CM1086
Min.
1.238
1.230
2.475
3.267
2.460
3.247
Typ.
1.250
1.250
2.500
3.300
2.500
3.300
0.04
0.08
1.00
1.15
1.5
3
5
CM1086K/S
V
IN
<= 12V, I
OUT
= 10mA to 3A
f
O
= 120Hz, V
RIPPLE
= 1V
PP
, , I
OUT
= 100mA
60
8
80
10
13
Max.
1.262
1.270
2.525
3.333
2.540
3.353
0.20
0.3
1.15
1.30
Parameter
Reference Voltage
(Note 1)
Output Voltage
Output Voltage
Line Regulator
(Note 1)
Load Regulation
(Note 1)
Dropout Voltage
(Note 2)
Current Limit
Minimum Load
Current (Note 3)
Quiescent Current
Ripple Rejection
(Note 4)
Device
CM1086
CM1086K
CM1086S
CM1086K
CM1086S
CM1086
CM1086
Test Conditions
(Note 1)
10mA <= I
OUT
<= 1.5A
T
A
= +25℃
I
OUT
= 10mA to 3A
1.5V+ V
OUT
<= V
IN
<= 12V
I
OUT
= 10mA to 3A
I
OUT
= 10mA
I
OUT
= 3A
(V
IN
– V
OUT
) = 2V
Unit
V
V
V
V
V
%
%
V
A
mA
mA
dB
Note 1:
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 2:
The specifications represent the minimum input/output voltage required to maintain 1% regulation.
Note 3:
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 4:
These parameters, although guaranteed, are not tested in production prior to shipment.
2002/02/05
Preliminary
Rev. 2
Champion Microelectronic Corporation
Page 4
CM1086
1.5A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
APPLICATION CIRCUIT
Fixed Output Voltage Regulator
Adjustable Regulator
2002/02/05
Preliminary
Rev. 2
Champion Microelectronic Corporation
Page 5
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