TS1537A/B/C
Dual 1A Low Dropout Positive Voltage Regulator
Pin assignment:
1. Input 2
2. Input 1
3. Ground
4. Output 1 (3.3V/2.5V)
5. Output 2 (2.5V/1.8V)
Dual Output for 3.3V, 2.5V or 1.8V
Low Dropout Voltage 1.3V max.
General Description
The TS1537A, TS1537B & TS1537C are low dropout positive voltage regulators 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/2.5V (TS1537A) or 3.3V/1.8V(TS1537B) or 2.5V/1.8V(TS1537C) logic
supply. This series are guaranteed to have less 1.4V dropout at full load current making it ideal to provide well regulated
outputs dual channels with up to 12V input supply.
This series is offered in 5-pin TO-263-5L package.
Features
Low dropout performance 1.3V max.
Full current rating over line and temperature.
Fast transient response
±2%Total
output regulation over line, load and
temperature
Build-in thermal shutdown each channel
Output current limiting for each channel
Good noise rejection
Channel 1=3.3V (TS1537A/B) or 2.5V (TS1537C)
Channel 2=2.5V (TS1537A) or 1.8V (TS1537B/C)
Block Diagram
(each channel)
Ordering Information
Part No.
TS1537ACM5
TS1537BCM5
TS1537CCM5
Note: TS1537A is ch1=3.3V, ch2=2.5V,
TS1537B is ch1=3.3V, ch2=1.8V.
TS1537C is ch1=2.5V, ch2=1.8V.
-0 ~ +85
o
C
TO-263-5L
Operating Temp.
(Ambient)
Package
Absolute Maximum Rating
Input Supply Voltage
Operation Input Supply Voltage
Power Dissipation
Operating Junction Temperature Range
Storage Temperature Range
Lead Soldering Temperature (260
o
C)
Vin
Vin (operate)
P
D
T
J
T
STG
12
10
Internally Limited
0 ~ +150
-65 ~ +150
10
V
V
W
o
o
C
C
S
TS1537A/B/C
1-5
2003/12 rev. B
Electrical Characteristics
Ta = 25
o
C, unless otherwise specified.
Parameter
Output
Voltage
TS1537A/B-Vout 1
TS1537A/C-Vout 2/1
TS1537B/C-Vout 2
Input Supply Voltage
Line Regulation
Load
Regulation
Vout 1
Vout 2
Conditions
4.8V
≤
Vin
≤
7V, Io=10mA
4V
≤
Vin
≤
7V, Io=10mA
4V
≤
Vin
≤
7V, Io=10mA
Min
3.267
2.475
1.782
--
Typ
3.3
2.5
1.8
--
0.015
0.5
1.3
8
0.008
--
0.5
60
Max
3.366
2.550
1.836
10
0.2
1.0
1.4
10
0.04
--
--
70
Unit
V
V
V
%
%
V
mA
uA
A
%
dB
Vout+1.5V
≤
Vin
≤
7V, Io=10mA
Vin=5V, 10mA
≤
Io
≤
1A
Vin=4V, 10mA
≤
Io
≤
1A
Io=1A,
∆Vout=0.1%Vout
0
o
C
≤
Tj
≤
125
o
C, (note 3)
Ta=25
o
C, 30mS pulse
Vin - Vout=3V
Io=10mA
F = 120Hz, Io=1A Cout=25uF,
Vin=Vout + 3V
--
--
--
--
--
1.1
--
--
(note 1,2)
Dropout Voltage
Minimum Load Current
Thermal Regulation
Current Limit
Temperature Stability
Ripple Rejection
Thermal Performance
Condition
Thermal Resistance
Junction to Ambient
TO-263-5L
85
Package type
Typ
Unit
o
C/W
Note 1: See thermal regulation specification 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 input / output voltage difference and the output current. Guaranteed maximum power
dissipation will not be available over the full input / output voltage range.
Note 3: Quiescent current is defined as the minimum output current required to maintain the regulation.
TS1537A/B/C
2-5
2003/12 rev. B
Typical Application Circuit
“A” version
“B” version
“C” version
TS1537A/B/C
3-5
2003/12 rev. B
Electrical Characteristics Curve
(each channel)
Figure 1: dropout voltage v.s. output current
Figure 2: load regulation v.s. temp.
Figure 3: output change v.s. temp.
Figure 4: line regulation
Figure 5: line transient response
Figure 6: load transient response
TS1537A/B/C
4-5
2003/12 rev. B
TO-263-5L Mechanical Drawing
A
E
F
J
B
DIM
A
B
C
D
E
F
G
H
I
J
TO-263-5L DIMENSION
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
10.220
14.600
0.750
1.573
4.560
1.240
2.280
0.280
8.240
1.540
10.260
15.870
0.770
1.827
4.570
1.270
2.790
0.320
8.280
1.800
0.402
0.575
0.030
0.062
0.179
0.049
0.090
0.011
0.324
0.060
0.404
0.625
0.030
0.072
0.180
0.050
0.110
0.013
0.326
0.071
I
C
G
D
H
TS1537A/B/C
5-5
2003/12 rev. B
