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ISSUED DATE :2005/07/22
REVISED DATE :2006/06/01B
G U 111 7 A
1A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Description
The GU1117A 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. GU1117A is also well suited
for other applications such as VGA cards. GU1117A 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
Typical Circuit
REF.
A
b
L4
c
L3
L1
E
Millimeter
Min. Max.
REF.
4.40 4.80 c2
0.76 1.00 b2
0.00 0.30 B D
0.36 0.5
e
1.50 REF.
L
2.29 2.79
9.80 10.4 L2
Millimeter
Min. Max.
1.25 1.45
1.17 1.47
8.6 9.0
2.54 REF.
14.6 15.8
0˚ 8˚
1.27 REF.
GU1117A
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Block Diagram
ISSUED DATE :2005/07/22
REVISED DATE :2006/06/01B
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
GU1117A
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