ISSUED DATE :2005/07/22
REVISED DATE :2006/06/01B
G U 111 7 A
1A Low Dropout Positive Adjustable or Fixed-Mode Regulator
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.
Description
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
REF.
A
b
L4
c
L3
L1
E
Millimeter
REF.
Min.
Max.
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.
Typical Circuit
GU1117A
Page: 1/4
ISSUED DATE :2005/07/22
REVISED DATE :2006/06/01B
Block Diagram
Pin Descriptions
Name
Adj (GND)
Vout
Vin
O
I
I/O
Pin#
1
2
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
Vin
PD
TST
TOP
DC Supply Voltage
Power Dissipation
Storage Temperature
Operating Junction Temperature Range
Parameter
Ratings
-0.3 to 12
Internally Limited
-65 ~ + 150
0 ~ + 150
:
:
Unit
V
GU1117A
Page: 2/4
ISSUED DATE :2005/07/22
REVISED DATE :2006/06/01B
Electrical Characteristics
Parameter
Reference Voltage
GU1117AADJ
GU1117A-1.5
GU1117A-1.8
Output Voltage
GU1117A-2.5
GU1117A-3.3
GU1117A-5.0
Line Regulation
GU1117A-XXX
GU1117AADJ
GU1117A-1.5
Load Regulation
GU1117A-1.8
GU1117A-2.5
GU1117A-3.3
GU1117A-5.0
Dropout Voltage
(V
IN
-V
OUT
)
Current Limit
Minimum Load Current
Adjust Pin Current
Quiescent Current
Thermal Regulation
Ripple Rejection
GU1117A-XXX
GU1117A-XXX
Adjustable model
Adjustable model
Conditions
Io=10mA, Tj=25 : , (Vin-Vout )=1.5V
Io=10mA, Tj=25 : , 3.0V Vin 12V
Io=10mA, Tj=25 : , 3.3V Vin 12V
Io=10mA, Tj=25 : , 4.0V Vin 12V
Io=10mA, Tj=25 : , 4.8V Vin 12V
Io=10mA, Tj=25 : , 6.5V Vin 12V
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)
Io=1A, ( Vout=0.1% Vout)
Vin-Vout=5V
Vin=5V
Vin=12V, Io=10mA
Vin=12V, Io=0mA
MIN
1.225
1.470
1.764
2.450
3.235
4.900
-
-
-
-
-
-
-
-
1.1
-
-
-
-
-
TYP
1.250
1.500
1.800
2.500
3.300
5.000
-
-
12
15
20
26
40
1.3
-
5
50
-
0.008
60
MAX
1.275
1.530
1.836
2.550
3.365
5.100
0.2
1
15
18
25
33
50
1.4
-
10
100
12
0.04
70
UNIT
V
V
V
V
V
V
%
%
mV
mV
mV
mV
mV
V
A
mA
uA
mA
%/W
dB
fixed model
T
A
=25 : ,30ms pulse
F=120HZ,C
OUT
=25uF Tantalum, I
OUT
=1A
GU1117A-XXX
V
IN
=V
OUT
+3V
Temperature Stability
I
O
=10mA
-
0.5
-
%
JA
Thermal Resistance
Junction-to-Ambient(No
-
91
-
: /W
heat sink ;No air flow)
JC
Thermal Resistance
Control Circuitry/Power Transistor
-
10
-
: /W
Junction-to-Case
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 15W. 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.
GU1117A
Page: 3/4
ISSUED DATE :2005/07/22
REVISED DATE :2006/06/01B
Characteristics Curve
Important Notice:
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM.
GTM reserves the right to make changes to its products without notice.
GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems.
GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
Head Office And Factory:
Taiwan:
No. 17-1 Tatung Rd. Fu Kou Hsin-Chu Industrial Park, Hsin-Chu, Taiwan, R. O. C.
TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785
China:
(201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China
TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165
GU1117A
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