UNISONIC TECHNOLOGIES CO., LTD
UM5237
Preliminary
LINEAR INTEGRATED CIRCUIT
3-TERMINAL ADJUSTABLE
REGULATOR
DESCRIPTION
The UTC
UM5237
is a 3-terminal adjustable regulator. It’s
used as a variable output voltage regulator.
The UTC
UM5237
has a less power dissipation and more
exact loading voltage regulation .it‘s suitable for driver circuit,
differential amplifier and reference voltage generator circuit, etc.
1
SOT-89
FEATURES
* Wide Input/Output voltage range
* Low Dropout Voltage
* Over current protect
* External circuit can adjust the output voltage
ORDERING INFORMATION
Ordering Number
Halogen Free
UM5237G-AB3-R
G: GROUND I: INPUT
Package
SOT-89
Pin Assignment
1
2
3
O
G
I
Packing
Tape Reel
Lead Free
UM5237L-AB3-R
Note: Pin Assignment: O: OUTPUT
UM5237G-AB3-R
(1)Packing Type
(2)Package Type
(3)Halogen Free
(1) R: Tape Reel
(2) AB3: SOT-89
(3) G: Halogen Free, L: Lead Free
MARKING INFORMATION
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Copyright © 2013 Unisonic Technologies Co., Ltd
1 of 6
QW-R101-040.c
UM5237
BLOCK DIAGRAM
Preliminary
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 6
QW-R101-040.c
UM5237
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
(T
A
=25°C, unless otherwise noted)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
30
V
Drive Current
I
D
30
mA
Input/Output Voltage Difference
V
IN
-V
OUT
28
V
Internal Power Dissipation
P
D
500
mW
Operating Temperature
T
OPR
-20~+75
°C
Storage Temperature
T
STG
-55~+150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
IN
V
OUT
RATINGS
3.5~30
1.5~25
UNIT
V
V
PARAMETER
Supply Voltage Range
Output Voltage Range
ELECTRICAL CHARACTERISTICS
MIN
3.5
1.5
TYP
MAX
30
28
UNIT
V
V
V
1.32
0.1
0.1
3.0
V
%/V
%
mA
%/°C
dB
μVrms
Test circuit (a) is used with T
A
=25°C, V
I
=15V, V
O
=12V, I
L
=200mA, C
REF
=1μA, R
1
=4.3KΩ
PARAMETER
SYMBOL
TEST CONDITIONS
Input Voltage
V
IN
Between Pin 1 and Pin 2
Output Voltage
V
OUT
R
2
≈0.82~108KΩ
Minimum Input/Output Voltage
V
IN
-V
OUT
Difference
Reference Voltage
V
REF
Between Pin 2 and Pin 3
Input Voltage Regulation
R
eg-in
V
I
=15~20V
Loading Voltage Regulation
R
eg-L
I
L
=10~200mA
I
L
=0 (disregarding the current in
Bias Current
I
B
resistors R
1
, R
2
)
Output Voltage Thermal Coefficient
TC
VO
T
A
=0~75°C
f=120Hz
Ripple Rejection
RR
measured with circuit (b)
Output Noise Voltage
V
NO
f=20Hz~100KHZ
0.2
1.2
1.26
0.02
0.02
1.7
0.02
68
25
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 6
QW-R101-040.c
UM5237
TEST CIRCUIT
(a) Standard test circuit
Preliminary
LINEAR INTEGRATED CIRCUIT
R
R
V
O
=V
REF
1
2
1.26
1
2
(V)
R
1
4.3
V
V
R
2
=R
1
O
1
4.3
O
1
(KΩ)
V
1.26
REF
(R
1
=4.3KΩ, V
RER
≈1.26V)
(b) Ripple rejection test circuit
f=120Hz, e
i
=0.1Vrms
2SB1314
R
2
V
I
220
C
0.33µF
1
UTC
UM5237
3
R
1
4.3K
2
+
C
REF
+
C R
L
47µ
I
L
+
C
e
RR=20 log e
i
(dB)
o
VV e
o
UNISONIC TECHNOLOGIES CO., LTD
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4 of 6
QW-R101-040.c
UM5237
1. Standard Application Circuit
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
R
2
36.6KΩ
V
I
=12.2V
2SB1314
V
O
=12V
+
100µF
C
REF
1000pF
2
R
1
4.3KΩ
R
I
220Ω
3
1
0.33µF
R
V
O
=V
REF
1
2
R
1
V , V
REF
=1.26V
2. Maximum Drive Current Controller Application Circuit
R
2
36.6KΩ
V
I
=12.2V
2SB1314
V
O
=12V
+
C
REF
1000pF
2
R
1
4.3KΩ
R
I
100µF
220Ω
R
IN
470Ω
3
1
0.33µF
3. Output Voltage ON/OFF Controller
Set control circuit resistor R so that voltage of point A is more than 1.5V and less than 5V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 6
QW-R101-040.c
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