CM1117F
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
GENERAL DESCRIPTION
The CM1117F 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 CM1117F offers current limiting and thermal protection.
The on chip trimming adjusts the reference voltage accuracy
to2%.
FEATURES
Three Terminal Adjustable or Fixed Voltages: 1.8V, 2.5V,
3.3V, and adjustable.
Output Current of 1A
Low dropout voltage: 1.1V Typ.
Line Regulation: 0.3% Max
Load Regulation: 2% Max
Fast Transient Response
Thermal Protection
SOT-223 package available
Rugged 3KV ESD withstand capability.
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
SOT-223
Top View
GND/ADJ
VOUT
2
1
ORDERING INFORMATION
Package Type
SOT-223
CM1117FDCM223
CM1117FKCM223
CM1117FSCM223
CM1117FCM223
CM1117FGDCM223*
CM1117FGKCM223*
CM1117FGSCM223*
CM1117FGCM223*
*Note:
G : Suffix for Pb Free Product
Operating Temperature
Range (T
A
)
0℃ ~ +85℃
0℃ ~ +85℃
0℃ ~ +85℃
0℃ ~ +85℃
0℃ ~ +85℃
0℃ ~ +85℃
0℃ ~ +85℃
0℃ ~ +85℃
Output Voltage
1.8V
2.5V
3.3V
ADJ.
1.8V
2.5V
3.3V
ADJ.
2007/11/06 Rev1.3
Champion Microelectronic Corporation
VIN
3
Page 1
CM1117F
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
ABSOLUTE MAXIMUM RATINGS
Input Voltage
…………….…………………………………………….……. +12V
Operating Junction Temperature Range, T
J
……………...… 0℃ to +125℃
Storage Temperature ………………………………….….…... -40℃ to +150℃
Lead Temperature (10 sec.) ……..……………………..….…………….... 260℃
THERMAL INFORMATION
Parameter
Thermal Resistance (Θ
ja
)
Internal Power Dissipation (P
D
) (ΔT = 100℃, No Heatsink)
Maximum Junction Temperature
Maximum Lead Temperature (10 Sec)
SOT-223
SOT-223
Maximum
136
900
125
260
Unit
℃/W
mW
℃
℃
BLOCK DIAGRAM
2007/11/06 Rev1.3
Champion Microelectronic Corporation
Page 2
CM1117F
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
OUT
= 10mA, and T
J
= +25℃; unless otherwise noted
CM1117F
Min.
1.225
1.764
2.450
3.234
Typ.
1.250
1.800
2.500
3.300
0.05
1
0.4
8
1
1.1
1.8
4
10
35
0.01
48
0.1
120
13
1.25
Max.
1.275
1.836
2.550
3.366
0.30
6.0
2
36
Parameter
Reference Voltage
Output Voltage
Device
CM1117F
CM1117FD
CM1117FK
CM1117FS
Adj. Output
Fixed Output
Adj. Output
Fixed Output
Fixed Output
Fixed Output
Test Conditions
I
OUT
= 10mA, V
IN
= 5V
10mA <= I
OUT
<= 1A, 3.2V<= V
IN
<= 7V
10mA <= I
OUT
<= 1A, 4.25V<= V
IN
<= 7V
10mA <= I
OUT
<= 1A, 4.75V<= V
IN
<= 7V
I
OUT
= 10mA, 1.5V<= V
IN
<= 7V
I
OUT
= 10mA, V
OUT
+ 1.5V<= V
IN
<= 7V
10mA <= I
OUT
<= 1A, V
IN
– V
OUT
= 3V
10mA <= I
OUT
<= 1A, V
IN
= V
OUT
+ 1.5V
I
OUT
= 10mA
I
OUT
= 1A
(V
IN
– V
OUT
) = 3V
V
IN
<= 7V
Unit
V
V
V
V
%
mV
%
mV
V
A
mA
mA
dB
%W
μA
Line Regulator
Load Regulation
Dropout Voltage
(V
IN
– V
OUT
)
Current Limit
Minimum Load
Current (Note 1)
Quiescent Current
Ripple Rejection
(Note 2)
Thermal Regulation
(Note 2)
Adjust Pin Current
Fixed Output
V
IN
<= 7V
f
O
= 120Hz, 1V
RMS
, , I
OUT
= 1A, (V
IN
– V
OUT
)= 3V
T
A
= 25℃, 30ms pulse
I
OUT
= 10mA, V
IN
– V
OUT
= 2V
Note 1:
For the adjustable device, 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:
These parameters, although guaranteed, are not tested in production.
2007/11/06 Rev1.3
Champion Microelectronic Corporation
Page 3
CM1117F
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
2007/11/06 Rev1.3
Champion Microelectronic Corporation
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CM1117F
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
Application Hints
Like any linear voltage regulator, CM1117F 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 CM1117F 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
]
The thermal limit of the package is then limited to
It must be
P
D(MAX)
= [T
J
– T
A
]/Θ
JA
where T
J
is the junction
temperature, TA is the ambient temperature, and
Θ
JA
is
around 136°C/W for CM1117F. CM1117F is designed
to enter thermal protection at 125°C. For example, if
T
A
is 25°C then the maximum P
D
is limited to about
0.9W. In other words, if I
OUT(MAX)
= 0.5A, then [V
IN
–
V
OUT
] cannot exceed 1.8V.
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.
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.
2007/11/06 Rev1.3
Champion Microelectronic Corporation
Page 5
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