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
2
Revised 6/30/98
Standard Application
C1 = Optional 1F ceramic
C2
= Optional 1F ceramic
Pin-Out Information
Pin
Function
1
V
in
2
GND
3
V
out
Ordering Information
78SR1 C
XX
Y
05
= 5.0 Volts
53
= 5.25 Volts
06
= 6.0 Volts
74
= 7.15 Volts
08
= 8.0 Volts
09
= 9.0 Volts
10
= 10.0 Volts
12
= 12.0 Volts
14
= 13.9 Volts
15
= 15.0 Volts
Package Suffix
V
= Vertical Mount
S
= Surface Mount
H
= Horizontal
Mount
1.5 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Very Small Footprint
High Efficiency > 85%
Self-Contained Inductor
Internal Short-Circuit Protection
Over-Temperature Protection
Wide Input Range
The 78SR100 is a series of wide input
voltage, 3-terminal Integrated Switching
Regulators (ISRs). These ISRs have a maxi-
mum output current of 1.5A and an output
voltage that is laser trimmed to a variety of
industry standard voltages.
These 78 series regulators have excellent
line and load regulation with internal short-
circuit and over-temperature protection, are
very flexible, and may be used in a wide
variety of applications.
7 8 S R 1 0 0
S e r i e s
Output Voltage
Specifications
Characteristics
78SR100 SERIES
(T
a
= 25C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
I
o
Over V
in
range
0.1*
--
1.5
A
Short Circuit Current
I
sc
V
in
= V
in
min
--
3.5
--
Apk
Input Voltage Range
V
in
0.1
I
o
1.5A
V
o
= 5V
7
--
30
V
V
o
= 12V
14.5
--
30
V
Output Voltage Tolerance
V
o
Over V
in
range, I
o
=1.5A
--
1.0
2.0
%Vo
T
a
= 0C to +60C
Line Regulation
Reg
line
Over V
in
range
--
0.2
0.4
%Vo
Load Regulation
Reg
load
0.1
I
o
1.5A
--
0.1
0.2
%Vo
V
o
Ripple/Noise
V
n
V
in
= 9V, I
o
= 1.5A
V
o
= 5V
--
50
--
mV
pp
V
in
= 16V, I
o
= 1.5A
V
o
= 12V
80
mV
pp
Transient Response
t
tr
50% load change
--
100
--
Sec
V
o
over/undershoot
--
30
--
%Vo
Efficiency
V
in
= 10V, I
o
= 1A
V
o
= 5V
--
85
--
%
V
in
= 17V, I
o
= 1A
V
o
= 12V
--
90
--
%
Switching Frequency
o
Over V
in
range, I
o
=1.5A
600
650
700
kHz
Absolute Maximum
T
a
--
-40
--
+85
C
Operating Temperature Range
Recommended Operating
T
a
Free Air Convection, (40-60LFM)
Temperature Range
At V
in
= 24V, I
o
=1.0A
-40
--
+80**
C
Thermal Resistance
ja
Free Air Convection, (40-60LFM)
--
45
--
C/W
Storage Temperature
T
s
--
-40
--
+125
C
Mechanical Shock
--
Per Mil-STD-883D, Method 2002.3
--
500
--
G's
Mechanical Vibration
--
Per Mil-STD-883D, Method 2007.2,
--
5
--
G's
20-2000 Hz, soldered in a PC board
Weight
--
--
--
6.5
--
grams
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
78SR100
Vout
GND
GND
Vin
C1
1
2
3
C2
Pkg Style 500
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
3
DA
T
A
SHEETS
C H A R A C T E R I S T I C D A T A
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
9
13
17
21
25
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
9
12
15
18
21
24
27
30
33
36
39
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1 6
1 9
2 2
2 5
2 8
3 1
3 4
3 7
4 0
78SR133_ 3.3 VDC
(See Note 1)
78SR105_ 5.0 VDC
(See Note 1)
78SR112_ 12.0 VDC
(See Note 1)
Efficiency vs Output Current
Ripple vs Output Current
Thermal Derating (T
a
)
(See Note 2)
Power Dissipation vs Output Current
Efficiency (%)
Ripple (mV)
Iout (A)
Pd (W
atts)
Efficiency (%)
Efficiency (%)
Ripple (mV)
Ripple (mV)
Iout (A)
Iout (A)
Pd (W
atts)
Pd (W
atts)
Iout (A)
Iout (A)
Iout (A)
Iout (A)
Iout (A)
Iout (A)
Iout (A)
Iout (A)
Iout (A)
Vin (Volts)
Vin (Volts)
Vin (Volts)
85C
60C
70C
85C
85C
70C
Note 1:
All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25C. This data is considered typical data for the ISR.
Note 2:
Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.)
60C
70C
7 8 S R 1 0 0
S e r i e s
Efficiency vs Output Current
Efficiency vs Output Current
Ripple vs Output Current
Ripple vs Output Current
Thermal Derating (T
a
)
(See Note 2)
Thermal Derating (T
a
)
(See Note 2)
Power Dissipation vs Output Current
Power Dissipation vs Output Current
40
50
60
70
80
90
100
0.0
0.5
1.0
1.5
7.0V
10.0V
15.0V
20.0V
25.0V
30.0V
Vin
0
10
20
30
40
50
60
0.0
0.5
1.0
1.5
7.0V
10.0V
15.0V
20.0V
25.0V
30.0V
Vin
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.0
0.5
1.0
1.5
7.0V
10.0V
15.0V
20.0V
25.0V
30.0V
Vin
40
50
60
70
80
90
100
0.0
0.5
1.0
1.5
7.0V
10.0V
15.0V
20.0V
25.0V
30.0V
Vin
0
10
20
30
40
50
60
70
80
0.0
0.5
1.0
1.5
7.0V
10.0V
15.0V
20.0V
25.0V
30.0V
Vin
60C
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.0
0.5
1.0
1.5
7.0V
10.0V
15.0V
20.0V
25.0V
30.0V
Vin
40
50
60
70
80
90
100
0.0
0.5
1.0
1.5
14.0V
20.0V
25.0V
30.0V
35.0V
Vin
0
20
40
60
80
100
120
140
0.0
0.5
1.0
1.5
14.0V
20.0V
25.0V
30.0V
35.0V
Vin
0.0
0.5
1.0
1.5
2.0
2.5
0.0
0.5
1.0
1.5
14.0V
20.0V
25.0V
30.0V
35.0V
Vin
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