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ISSUED DATE :2006/06/06
REVISED DATE :
G 111 7 A
1A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Description
The G1117A is a low dropout at positive adjustable or fixed-mode regulator with minimum of 1A output current
capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications
such as high-speed bus termination and low current 3.3V logic supply. G1117A is also well suited for other
applications such as VGA cards. G1117A is guaranteed to have lower than 1.4V dropout at full load current
making it ideal to provide well-regulated outputs of 1.25 to 5.0 with 6.4V to 12V input supply.
Features
1.4Vmaximum dropout full load current
Fast transient response
Output current limiting
Built-in thermal shutdown
Good noise rejection
3-Terminal Adjustable or Fixed 1.5V,1.8V,2.5V,3.3V,5.0V
Package Dimensions
D
TO-92
E
S1
SEATING
PLANE
b1
e1
e
b
Typical Circuit
C
REF.
A
S1
b
b1
C
Millimeter
Min. Max.
4.45 4.7
1.02 -
0.36 0.51
0.36 0.76
0.36 0.51
REF.
D
E
L
e1
e
Millimeter
Min. Max.
4.44 4.7
3.30 3.81
12.70
-
1.150 1.390
2.42 2.66
G1117A
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Block Diagram
ISSUED DATE :2006/06/06
REVISED DATE :
Pin Descriptions
Name I/O Pin#
Adj (GND)
1
Vout
O2
Vin I 3
Function
A resistor divider from this pin to the Vout pin and ground sets the output voltage (Ground
only for fixed mode)
The output of the regulator. A minimum of 10uF capacitor must be connected from this pin
to ground to insure stability.
The input pin of regulator. Typically a large storage capacitor is connected from this pin to
ground to insure that the input voltage does not sag below the minimum dropout voltage
during the load transient response. This pin must always be 1.3V higher than Vout in order
for the device to regulate properly.
Absolute Maximum Ratings
Symbol
Parameter
Vin DC Supply Voltage
PD Power Dissipation
TST Storage Temperature
TOP
Operating Junction Temperature Range
Ratings
-0.3 to 12
Internally Limited
-65 ~ + 150
0 ~ + 150
Unit
V
G1117A
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ISSUED DATE :2006/06/06
REVISED DATE :
Electrical Characteristics
Parameter
Reference Voltage
Output Voltage
Line Regulation
Load Regulation
G1117AADJ
G1117A-1.5
G1117A-1.8
G1117A-2.5
G1117A-3.3
G1117A-5.0
G1117A-XXX
G1117AADJ
G1117A-1.5
G1117A-1.8
G1117A-2.5
G1117A-3.3
G1117A-5.0
Dropout Voltage
(VIN-VOUT)
G1117A-XXX
Conditions
MIN
Io=10mA, Tj=25 , (Vin-Vout )=1.5V
1.225
Io=10mA, Tj=25 , 3.0V Vin 12V
1.470
Io=10mA, Tj=25 , 3.3V Vin 12V
1.764
Io=10mA, Tj=25 , 4.0V Vin 12V
2.450
Io=10mA, Tj=25 , 4.8V Vin 12V
3.235
Io=10mA, Tj=25 , 6.5V Vin 12V
4.900
Io=10mA, Vout+1.5V<Vin<12V, Tj=25
-
Vin=3.3V, Vadj=0, 0mA<Io<1A, Tj=25 (Note 1,2) -
Vin=3.0V, 0mA<Io<1A, TJ=25 (Note 1,2)
-
Vin=3.3V, 0mA<Io<1A, TJ=25 (Note 1,2)
-
Vin=4.0V, 0mA<Io<1A, TJ=25 (Note 1,2)
-
Vin=5.0V, 0mA<Io<1A, TJ=25 (Note 1,2)
-
Vin=8.0V, 0mA<Io<1A, TJ=25 (Note 1,2)
-
TYP
1.250
1.500
1.800
2.500
3.300
5.000
-
-
12
15
20
26
40
MAX UNIT
1.275 V
1.530 V
1.836 V
2.550 V
3.365 V
5.100 V
0.2 %
1%
15 mV
18 mV
25 mV
33 mV
50 mV
Io=1A, ( Vout=0.1% Vout)
- 1.3 1.4 V
Current Limit
G1117A-XXX Vin-Vout=5V
1.1 -
-A
Minimum Load Current Adjustable model Vin=5V
- 5 10 mA
Adjust Pin Current
Adjustable model Vin=12V, Io=10mA
- 50 100 uA
Quiescent Current
fixed model
Vin=12V, Io=0mA
- - 12 mA
Thermal Regulation
TA=25 ,30ms pulse
- 0.008 0.04 %/W
Ripple Rejection
F=120Hz, COUT=25uF Tantalum, IOUT=1A
G1117A-XXX VIN=VOUT+3V
- 60 70 dB
Temperature Stability IO=10mA
- 0.5 - %
JA Thermal Resistance
Junction-to-Ambient(No
heat sink ;No air flow)
- 160 -
/W
Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation
are measured at a constant junction Temperature by low duty cycle pulse testing. Load regulation is measured at the
output lead =1/18” from the package.
Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 3W. Power dissipation is
determined by the difference in input and output and the output current. Guaranteed maximum power dissipation will
not be available over the full input/output range.
G1117A
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