WEITRON
1.0A LOW DROPOUT PRECISION LINEAR REGULATORS
P b
Lead(Pb)-Free
General Description:
WT1117A
WT1117A of positive adjustable and fixed regulators is designed to provide 1.0A output with
low dropout voltage performance. On-chip trimming adjusts the reference voltage to 1.5%.
For usage on working in post regulators or microprocessor power supplies, low voltage
operation and fast transient response are required.
WT1117A is available in surface-mount SOT-223 and TO-252 packages.
Features:
* Adjustable or Fixed Output
* Output Current of 1.0A
* Dropout Voltage(Typical) 1.15V @1.0A
* Line Regulation 0.2% max.
* Load Regulation 0.4% max.
* Fast Transient Response
* Current Limit Protection
* Thermal Shutdown Protection
Applications:
* High Efficiency Linear Regulators
* Post Regulators for Switching Supplies
* Microprocessor Supply
* Hard Drive Controllers
* Battery Chargers
* Adjustable Power Supply
WEITRON
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1/11
Rev-A 18-Oct-06
WT1117A
Ordering Information
Ordering Number Output Voltage
WT1117AN-X
WT1117AD-X
WT1117AN-15
WT1117AD-15
WT1117AN-18
WT1117AD-18
WT1117AN-25
WT1117AD-25
WT1117AN-285
WT1117AD-285
WT1117AN-30
WT1117AD-30
WT1117AN-33
WT1117AD-33
WT1117AN-50
WT1117AD-50
Adj
Adj
1.5
1.5
1.8
1.8
2.5
2.5
2.85
2.85
3.0
3.0
3.3
3.3
5.0
5.0
Package
SOT-223
TO-252
SOT-223
TO-252
SOT-223
TO-252
SOT-223
TO-252
SOT-223
TO-252
SOT-223
TO-252
SOT-223
TO-252
SOT-223
TO-252
Shipping
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
2,500 Units/Tape&Reel
Marking Information & PIN Configurtions
(Top View)
TO-252 (DPAK)
SOT-223
1117-VV
YAWW
YAWW
1117-VV
ADJ/ GND*
V
OUT
V
IN
V
OUT
ADJ/GND*
V
IN
V V/VVV
A
Y
WW
= Output Voltage (50 = 5.0V, 285= 2.85V ,X = ADJ )
= Assembly Location
= Year
= Weekly
On fixed versions Pin 1 = GND,
on adjustable versions Pin 1 = A
DJ
Tab = V
OUT
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WEITRON
2/11
Rev-A 18-Oct-06
WT1117A
Typical Application
(Adjustable Version)
(Fixed Version)
V
OUT
= 3.45V
V
IN
> 4.75V
3
WT1117A-Adj
2
V
OUT
V
IN
ADJ
V
IN
> 4.75V
3
WT1117A-3.3
V
OUT
2
V
IN
GND
V
OUT
= 3.3V
+
C
10μF
Tant
1
R1
133
1.0%
R2
232
1.0%
R2
) + I
ADJ
X R2
R1
+
C2
10μF
Tant
.
Min
+
C
1
10μF
Tant
1
+
C2
10μF
Tant
.
Min
V
OUT
= V
REF
X (1 +
Notes:
1. C1 needed if device is far from filter capacitors
2. C2 minimum value required for stability
Block Diagram
(Fixed Version)
VIN
Output
Current
Limit
V
OUT
Thermal
Shutdown
-
Bandgap
Reference
+
Error
Amplifier
GND
(Adjustable Version)
V
IN
Output
Current
Limit
V
OUT
Thermal
Shutdown
-
Bandgap
Reference
+
Error
Amplifier
ADJ
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WEITRON
3/11
Rev-A 18-Oct-06
WT1117A
Parameter
Power Dissipation
Input Voltage
Lead Temperature(Soldering, 10sec)
Symbol
P
D
V
IN
T
LEAD
T
J
T
STG
Value
Internally limited
7.0
300
-40 to 125
-40 to 150
-65 to + 150
UNIT
W
V
°C
°C
°C
Operating Junction Temperature Range
Control Section
Power Transistor
Storage Temperature Range
Thermal Characteristics
SOT-223
Thermal Resistance, Junction-to-Case
DPAK
Thermal Resistance, Junction-to-Case
R
JC
15
6.0
°C / W
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WEITRON
4/11
Rev-A 18-Oct-06
WT1117A
ELECTRICAL CHARACTERISTICS
Typicals and limits appearing in normal type apply for Tj 25°C
Parameter
Reference Voltage
WT1117A-Adj
Symbol
V
REF
10mA
Condition
I
OUT
=10mA, V
IN
= 5V
I
OUT
1.0A, 2.65V V
IN
7V
I
OUT
=10mA, V
IN
=V
OUT
+1.5V
V
IN
=V
OUT
+1.5V to 7 V
0 I
OUT
1.0A
I
Load
=10mA,
(1.5 V +V
OUT
)
V
OUT
7V
Min
1.232
1.225
-1.5
-2
-
-
-
1.0
-
-
V
IN
7V
-
-
-
60
Typ
1.250
1.250
-
-
0.04
Max
1.268
1.275
+1.5
+
2
0.20
Unit
V
%
%
%
Output Voltage
-
Line Regulation
All
REG
LINE
REG
LOAD
V
D
I
CL
I
O MIN
I
Q
I
ADJ
Load Regulation
Dropout Voltage
Current Limit
Minimum Load Current
Ground Current
Adjust Pin Current
Temp. Coefficient
Thermal Regulation
Ripple Rejection
(Note 1)
All
All
All
WT1117A-Adj
All Fixed
Versions
WT1117A-Adj
All
All
All
V
IN
=V
OUT
+ 1.5V
I
Load
=10mA to 1.0A
0.20
1.15
-
2
7
35
0.005
0.003
72
0.40
1.3
%
I
OUT
=1.0A
V
IN
-V
OUT
=1.5V
V
IN
=5V, Vadj=0V
V
IN
=V
OUT
+ 1.5V
I
Load
=10mA to 1.0A
I
Load
=10mA, 2.65V
V
A
mA
mA
μA
%/°C
%/W
dB
-
7
13
90
V
IN
-V
OUT
=1.5V,
I
Load
=10mA
T
C
R
A
T
A
=25
℃,
30ms pulse
V
IN
-V
OUT
=1.5V,
I
Load
=1.0A
-
-
-
Note 1
:
120Hz input ripple
(
C
ADJ
for ADJ =25μF
)
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WEITRON
5/11
Rev-A 18-Oct-06
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