CM1117
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
GENERAL DESCRIPTION
The CM1117 series of adjustable and fixed voltage regulators
are designed to provide 1A for applications requiring high
efficiency. All internal circuitry is designed to operated down to
1V input to output differential and the dropout voltage is fully
specified as a function of load current.
The CM1117 offers current limiting and thermal protection.
The on chip trimming adjusts the reference voltage accuracy
to 1%.
FEATURES
Three Terminal Adjustable or Fixed Voltages: 1.8V, 2.5V,
3.3V, and adjustable.
Output Current of 1A
Low dropout voltage: 1V Typ.
Line Regulation: 0.2% Max
Load Regulation: 0.4% Max
Fast Transient Response
Thermal Protection
SOT-223 and TO-252 package available
APPLICATIONS
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Battery Chargers
Active SCSI Terminators
Post Regulator for Switching DC/DC Converter
Battery Powered Instrumentation
PIN CONFIGURATION
TO-252
Front View
VIN
VO UT
G ND/ADJ
3
VOUT
2
SOT-223
Top View
2
1
GND/ADJ
1
ORDERING INFORMATION
Package Type
TO-252
CM1117DCN252
CM1117KCN252
CM1117SCN252
CM1117CN252
CM1117GDCN252*
CM1117GKCN252*
CM1117GSCN252*
CM1117GCN252*
*Note:
G : Suffix for Pb Free Product
SOT-223
CM1117DCM223
CM1117KCM223
CM1117SCM223
CM1117CM223
CM1117GDCM223*
CM1117GKCM223*
CM1117GSCM223*
CM1117GCM223*
Operating Temperature
Range (T
A
)
0℃ ~ +125℃
0℃ ~ +125℃
0℃ ~ +125℃
0℃ ~ +125℃
0℃ ~ +125℃
0℃ ~ +125℃
0℃ ~ +125℃
0℃ ~ +125℃
Output Voltage
1.8V
2.5V
3.3V
ADJ.
1.8V
2.5V
3.3V
ADJ.
2007/05/02 Rev1.9
Champion Microelectronic Corporation
VIN
3
Page 1
CM1117
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
ABSOLUTE MAXIMUM RATINGS
Input Voltage
…………….…………………………………………….……. +18V
……………...… 0℃ to +125℃
Operating Junction Temperature Range, T
J
Storage Temperature ………………………………….….…... -65℃ to +150℃
Lead Temperature (10 sec.) ……..……………………..….…………….... 260℃
THERMAL INFORMATION
Parameter
Thermal Resistance (Θ
jc
)
Thermal Resistance (Θ
ja
)
Internal Power Dissipation (P
D
) (ΔT = 100℃, No Heatsink)
Maximum Junction Temperature
Maximum Lead Temperature (10 Sec)
SOT-223
TO-252
SOT-223
TO-252
SOT-223
TO-252
Maximum
15
50
136
80
900
1500
150
300
Unit
℃/W
℃/W
mW
℃
℃
BLOCK DIAGRAM
2007/05/02 Rev1.9
Champion Microelectronic Corporation
Page 2
CM1117
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
OUT
= 10mA, and T
J
= +25℃; unless otherwise noted
Symbol
V
REF
Parameter
Reference Voltage
Conditions
CM1117-ADJ
I
OUT
=10mA, V
IN
-V
OUT
=2V, T
J
=25℃
10mA≤I
OUT
≤1A,
1.4V≤V
IN
-V
OUT
≤10V
CM1117 -1.8
I
OUT
=10mA, V
IN
=3.8V, T
J
=25℃
0≤I
OUT
≤1A,
3.2V≤V
IN
-V
OUT
≤10V
CM1117 -2.5
I
OUT
=10mA, V
IN
=4.5V, T
J
=25℃
0≤I
OUT
≤1A,
3.9V≤V
IN
-V
OUT
≤10V
CM1117 -3.3
I
OUT
=10mA, V
IN
=5V, T
J
=25℃
0≤I
OUT
≤1A,
4.75V≤V
IN
-V
OUT
≤10V
CM1117 -ADJ
I
OUT
=10mA, 1.5V≤V
IN
-V
OUT
≤13.75V
CM1117 -1.8
I
OUT
=0mA, 3.2V≤V
IN
≤10V
CM1117 -2.5
I
OUT
=0mA, 3.9V≤V
IN
≤10V
CM1117 -3.3
I
OUT
=0mA, 4.75V≤V
IN
≤10V
CM1117 -ADJ
V
IN
-V
OUT
=3V, 10mA≤I
OUT
≤1A
CM1117 -1.8
V
IN
=3.2V, 0≤I
OUT
≤1A
CM1117 -2.5
V
IN
=3.9V, 0≤I
OUT
≤1A
CM1117 -3.3
V
IN
=4.75V, 0≤I
OUT
≤1A
I
OUT
=100mA
I
OUT
=500mA
I
OUT
=1A (TO-252)
V
IN
-V
OUT
=5V, T
J
=25℃
CM1117 -ADJ
V
IN
=15V
CM1117 -1.8, V
IN
≤15V
CM1117 -2.5, V
IN
≤15V
CM1117 -3.3, V
IN
≤15V
T
A
=25℃,
30ms Pulse
f
RIPPLE
=120Hz, V
IN
-V
OUT
=3V
V
RIPPLE
=1V
PP
10mA≤I
OUT
≤1A
1.4V≤V
IN
-V
OUT
≤10V
T
A
=125℃,
1000Hrs
(% of V
OUT
), 10Hz≤f≤10kHz
3-Lead SOT-223
3-Lead TO-252
3-Lead SOT-223
3-Lead TO-252 (Note 6)
Min
(Note 2)
1.238
Typ
(Note 1)
1.250
Max
(Note 2)
1.262
Units
V
V
OUT
Output Voltage
1.764
1.8
1.836
V
2.45
2.500
2.55
V
3.234
3.300
0.035
1
1
1
0.2
1
1
1
1.10
1.15
1.20
1200
1.7
5
5
5
0.01
3.366
0.2
6
6
6
0.4
10
10
10
1.20
1.25
1.30
1500
5
10
10
10
0.1
V
%
mV
mV
mV
%
mV
mV
mV
V
V
V
mA
mA
mA
mA
mA
%/W
dB
ΔV
OUT
Line Regulation
(Note 3)
ΔV
OUT
Load Regulation
(Note 3)
V
IN
-V
OUT
I
LIMIT
Dropout Voltage
(Note 4)
Current Limit
Minimum Load
Current (Note 5)
Quiescent Current
1000
Thermal Regulation
Ripple Regulation
Adjust Pin Current
Adjust Pin Current
Change
Temperature Stability
Long Term Stability
RMS Output Noise
Thermal Resistance
Junction-to-Case
Thermal Resistance
Junction-to-Ambient
(No heat sink;
No air flow)
60
75
60
0.2
0.5
0.3
0.003
15.0
3.0
10
136
79
92
120
5
μA
μA
%
%
%
℃/W
℃/W
℃/W
℃/W
℃/W
℃/W
2007/05/02 Rev1.9
Champion Microelectronic Corporation
Page 3
CM1117
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
Note 1:
Typical Values represent the most likely parametric norm.
Note 2:
All limits are guaranteed by testing or statistical analysis.
Note 3:
Load and line regulation are measured at constant junction room temperature.
Note 4:
The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input
voltage. It is measured when the output voltage has dropped 100mV from the nominal value obtained at V
IN
= V
OUT
+1.5V.
Note 5:
The minimum output current required to maintain regulation.
Note 6:
Minimum pad size of 0.038in
2
Application Hints
Like any linear voltage regulator, CM1117 requires
external capacitors to ensure stability. The external
capacitors must be carefully selected to ensure
performance.
Thermal Considerations
It is important that the thermal limit of the package is
not exceeded.
The CM1117 has built-in thermal
protection. When the thermal limit is exceeded, the IC
will enter protection, and V
OUT
will be pulled to ground.
The power dissipation for a given application can be
calculated as following:
The power dissipation (P
D
) is
P
D
= I
OUT
* [V
IN
– V
OUT
]
Input Capacitor
An input capacitor of at least 10μF is required.
Ceramic or Tantalum can be used. The value can be
increase without upper limit.
Output Capacitor
An output capacitor is required for stability.
It must be
placed no more than 1 cm away from the V
OUT
pin, and
connected directly between V
OUT
and GND pins. The
minimum value is 22μF but may be increase without
limit.
2007/05/02 Rev1.9
Champion Microelectronic Corporation
Page 4
CM1117
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
APPLICATION CIRCUIT
Adjustable Regulator
VOUT = 1.25V (1+R2/R1)
5V Regulator with Shutdown
Fixed Voltage Regulator
2007/05/02 Rev1.9
Champion Microelectronic Corporation
Page 5
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