For assistance or to order, call
(800) 531-5782
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://www.powertrends.com
42
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
Ordering Information
PT5021
o = -3.3 Volts
PT5022
o = -5 Volts
PT5023
o = -9 Volts
PT5024
o = -12 Volts
PT5025
o = -15 Volts
PT5026
o = -5.2 Volts
PT5027
o = -8.0 Volts
PT5028
o = -6.5 Volts
PT5029
o = -5.5 Volts
PT5030
o = -6.0 Volts
Pin
Function
1
V
in
2
GND
3
V
out
Standard Application
C
2
= Optional ceramic (1-5F)
C
3
= Required Electrolytic (100F)
PT Series Suffix
(PT12345
X
)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
Input Voltage Range:
4.75 to 7 Volts
Complete Solution With Only
One External Capacitor Required
Soft Start
The Power Trends' PT5020 ISRs
convert a positive input voltage (typ +5V)
to a negative output voltage for a wide
range of analog and communication cir-
cuit applications.
The Plus to Minus ISRs use a "Buck-
Boost" topology and are packaged in the
3 pin SIP configuration.
NOTE: Buck-Boost Topology ISRs are not Short-Circuit Protected.
POSITIVE INPUT/NEGATIVE OUTPUT
INTEGRATED SWITCHING REGULATOR
P T 5 0 2 0
S e r i e s
V
IN
(+)
COM
PT5020
COM
V
OUT
(-)
C2
C3
Pin-Out Information
1
2
3
Pkg Style 100
Specifications
Characteristics
PT5020 SERIES
(T
a
=25
C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
I
o
Over V
in
range V
o
=-3.3V to 6.5V
0.25*
--
1.0
A
V
o
=-9V
0.10*
--
0.60
A
V
o
=-12V
0.10*
--
0.50
A
V
o
=-15V
0.10*
--
0.30
A
Current Limit
I
cl
V
in
= 5V
--
1.5 I
o max
--
A
Inrush Current
I
ir
V
in
= +5V @ max I
o
--
1.0
--
A
t
ir
On start up
--
1.0
--
mSec
Short Circuit Current
I
sc
V
in
= 5V
--
2 I
o max
--
A
Input Voltage Range
V
in
I
o
= 0.1 to I
o max
4.75
--
7**
V
Output Voltage Tolerance
V
o
Over V
in
Range I
o
= I
max
--
1.5
3
%V
o
T
a
= -20C to shutdown
Line Regulation
Reg
line
Over V
in
range
--
0.5
1
%V
o
Load Regulation
Reg
load
I
min
I
o
I
max
--
0.5
1
%V
o
V
o
Ripple/Noise
V
n
V
in
=5V, I
o
= I
max
--
2
5
%V
o
Transient Response
t
tr
25% load change
--
500
--
Sec
V
o
over/undershoot
--
3.0
5.0
%V
o
Efficiency
V
in
=5V, I
o
=0.5 I
max
--
75
--
%
Switching Frequency
O
Over I
o
range
V
o
=3.3 to 8V
0.8
1
1.2
MHz
V
o
8 V
500
650
800
kHz
Absolute Maximum
T
a
--
-20
--
+85
C
Operating Temperature Range
Recommended Operating
T
a
Free Air Convection, (40-60 LFM)
-20
--
+65***
C
Temperature Range
Over V
in
and I
o
range
Thermal Resistance
ja
Free Air Convection
--
50
--
C/W
(40-60LFM)
Storage Temperature
T
s
-40
--
+125
C
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
1 msec, Half Sine, mounted to a fixture
--
500
--
G's
Mechanical Vibration
Per Mil-STD-883D, Method 2007.2,
--
5
--
G's
20-2000 Hz, Soldered in a PC board
Weight
--
4.5
--
grams
* ISR will operate down to no load with reduced specifications.
** For applications with input voltages greater than 7 VDC, use the PT78NR100 Series.
*** See SOA Curves.
For assistance or to order, call
(800) 531-5782
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://
www.powertrends.com
43
5V to 3.x Converters
5V Bus Products
DA
T
A
SHEETS
C H A R A C T E R I S T I C D A T A
PT5022 (-5VDC)
(See Note 1)
Efficiency vs Output Current
Ripple Voltage vs Output Current
Power Dissipation vs Output Current
Note 1:
All data listed in the above graphs has been developed from actual products tested at 25C. This data is considered typical data for the ISR.
PT5024 (-12VDC)
(See Note 1)
Efficiency vs Output Current
Ripple Voltage vs Output Current
Power Dissipation vs Output Current
Safe Operating Area (V
IN
=5V)
Safe Operating Area (V
IN
=5V)
C H A R A C T E R I S T I C D A T A
P T 5 0 2 0
S e r i e s
Efficiency - %
Ripple-(mV)
PD-(W
atts)
Iout-(Amps)
Iout-(Amps)
PD-(W
atts)
40
50
60
70
80
90
100
0
0 .1
0 .2
0 .3
0 .4
0 .5
7 .0 V
6 .5 V
6 .0 V
5 .5 V
5 .0 V
4 .7 5V
V in
Ripple-(mV)
Iout-(Amps)
Iout-(Amps)
Ambient T
e
mperatur
e
- (C)
Ambient T
e
mperatur
e
- (C)
Maximum Output Ciurrent - (Amps)
Maximum Output Ciurrent - (Amps)
Iout-(Amps)
Iout-(Amps)
0
0.5
1
1.5
2
0
0.1
0.2
0.3
0.4
0.5
4 .7 5 V
5 .0 V
5 .5 V
6 .0 V
6 .5 V
7 .0 V
V in
0
2 0
4 0
6 0
8 0
10 0
12 0
14 0
16 0
0
0.1
0.2
0.3
0.4
0.5
4 .75 V
5 .0V
5 .5V
6 .0V
6 .5V
7 .0V
Vin
40
50
60
70
80
90
100
0
0 .2
0 .4
0 .6
0 .8
1
7 .0V
6 .5V
6 .0V
5 .5V
5 .0V
4 .75 V
V in
0
0.5
1
1.5
2
2.5
0
0.2
0.4
0.6
0.8
1
4.75 V
5.0V
5.5V
6.0V
6.5V
7.0V
Vin
0
2 0
4 0
6 0
8 0
1 0 0
0
0 .2
0 .4
0 .6
0 .8
1
4 .7 5 V
5 .0 V
5 .5 V
6 .0 V
6 .5 V
7 .0 V
V in
Efficiency - %
20
30
40
50
60
70
80
90
0
0.2
0.4
0.6
0.8
1
0 LFM
60 LFM
90 LFM
Airflow
20
30
40
50
60
70
80
90
0 .0
0 .1
0 .2
0 .3
0 .4
0 .5
9 0 L FM
6 0 L FM
0 L FM
Airflow
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1999, Texas Instruments Incorporated
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