For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT5071--12V
1.5 Amp, 12V Step-Up/Step-Down
Integrated Switching Regulator
SLTS139
(Revised 2/7/2001)
Standard Application
C
1
, C
2
= Required 100F electrolytic (See footnotes)
Ordering Information
PT5071
= +12 Volts
PT Series Suffix
(PT1234
X
)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
Pin
Function
1
N/C
2
UVLO Adj
3
STBY*
4
V
in
5
V
in
6
V
in
7
GND
8
GND
9
GND
10
GND
11
V
out
12
V
out
13
V
out
14
V
out
Adjust
Features
Single-Device:
+12V Output, 7-16V Input
84% Efficiency
14-Pin ExcaliburTM Package
Output Current Limit
Adjustable Output Voltage
Adjustable Undervoltage Lockout
Solderable Copper Case
Description
The PT5071 is a 1.5-ampere rated step-up/
step-down Integrated Switching Regulator
(ISR) that provides a tightly regulated 12V
output voltage from a 7V to 16V variable
input source. This high-performance ISR has
applications in systems where the input
voltage straddles the desired 12V output.
The regulator has an adjustable output
voltage and input start-up threshold, and a
standby function for power conservation.
Pin-Out Information
C
1
+
C
2
+
PT5071
UVadj
G N D
V
IN
V
OUT
V
0
adj
STBY*
4-6
11-13
2
3
7-10
14
V
I N
V
O U T
S T B Y
G N D
G N D
U V
A D J
(For dimensions and PC board layout,
see Package Styles 1360 and 1370.)
For Inhibit pin:
Open = output enabled
Ground = output disabled
Specifications
Characteristics
PT5071
(T
a
= 25C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
I
o
Over V
in
Range
0.1
(1)
--
1.5
A
Current Limit
I
lim
V
in
= 12V
--
4.0
A
Input Voltage Range
V
in
0.1A
I
o
I
o
max
7.0
--
16.0
V
Output Voltage Tolerance
V
o
V
in
=12V, I
o
=I
o
max
1.0
%
40C
T
a
+85C
Output Voltage Adjust Range
V
o
adj
10
--
15
V
Line Regulation
Reg
line
Over V
in
Range, I
o
=I
o
max
--
0.5
%
Load Regulation
Reg
load
V
in
=12V, 0.1
I
o
I
o
max
--
0.5
%
Vo Ripple/Noise
V
n
V
in
=12V, I
o
=I
o
max
--
2.0
3.0
%
Transient Response
t
tr
Load step from 50% to 100% I
o
max, V
in
=12V
--
200
--
Sec
with C
2
= 100F
V
os
V
o
over/undershoot
--
1.0
--
%V
o
Efficiency
V
in
=12V, V
o
=12V, I
o
=1.5A
--
83
--
%
Switching Frequency
o
Over V
in
Range
--
550
--
kHz
0.1A
I
o
I
o
max
Absolute Maximum
T
a
Over V
in
range
40
(2)
--
+85
(3)
C
Operating Temperature Range
Storage Temperature
T
s
--
40
--
+125
C
Mechanical Shock
Per Mil-STD-883D, Method 2002.3 , 1 msec,
--
TBD
--
G's
Half Sine, mounted to a fixture
Mechanical Vibration
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, Soldered in a PC board
--
TBD
--
G's
Weight
--
--
--
25
--
grams
Notes: 1. The regulator will operate down to no load with reduced specifications.
2. For operating temperatures below 0C, it is recommended that tantalum capacitors be used at both the input and output.
3. See SOA curves, or contact the factory for derating guidelines.
Input/Output Capacitors: The PT5071 regulator requires a 100F electrolytic capacitor at the input and output for proper operation in all applications. The ESR
(equivalent series resistance) of both capacitors must be less than 250m
@100kHz. In addition, C
1
and C
2
must be rated to a minimum of 300mArms ripple current.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Typical Characteristics
Note A:
All Characteristic data in the above graphs has been developed from actual products tested at 25C. This data is considered typical data for the ISR.
Note B:
SOA curves represent operating conditions at which internal components are at or below manufacturer's maximum rated operating temperatures.
PT5071--12V
1.5 Amp, 12V Step-Up/Step-Down
Integrated Switching Regulator
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
0.0
0.3
0.6
0.9
1.2
1.5
Iout (A)
Ambient Temperature (C)
200LFM
120LFM
60LFM
Nat conv
Airflow
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
0.0
0.3
0.6
0.9
1.2
1.5
Iout (A)
Ambient Temperature (C)
200LFM
120LFM
60LFM
Nat conv
Airflow
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
0.0
0.3
0.6
0.9
1.2
1.5
Iout (A)
Ambient Temperature (C)
200LFM
120LFM
60LFM
Nat conv
Airflow
Safe Operating Area Curves
(See Note B)
PT5071, V
in
=7V
PT5071, V
in
=12V
PT5071, V
in
=16V
0
50
100
150
200
250
0
0.3
0.6
0.9
1.2
1.5
Iout (A)
Ripple - mV
7.0V
12.0V
16.0V
V
IN
50
60
70
80
90
0
0.3
0.6
0.9
1.2
1.5
Iout (A)
Efficiency - %
7.0V
12.0V
16.0V
V
IN
0
1
2
3
4
5
0
0.3
0.6
0.9
1.2
1.5
Iout (A)
Pd - Watts
16.0V
12.0V
7.0V
V
IN
PT5071 Performance, V
o
=12V
(See Note A)
Efficiency vs Output Current
Ripple vs Output Current
Power Dissipation vs Output Current
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Copyright
2001, Texas Instruments Incorporated
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