For assistance or to order, call
(800) 531-5782
78SR100
Series
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
Pin-Out Information
Standard Application
Pin
Function
1
Vin
2
GND
3
Vin
1
78SR100
C1
2
3
78SR1 XX
Vout
Vout
GND
C1 = Optional 1µF ceramic
C2 = Optional 1µF ceramic
Y C
Output Voltage
Package Suffix
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
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
Pkg Style 500
Specifications
78SR100 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Over Vin range
0.1*
—
1.5
A
Short Circuit Current
Isc
Vin = Vin min
—
3.5
—
Apk
Input Voltage Range
Vin
0.1 ≤ Io ≤ 1.5A
7
14.5
—
—
30
30
V
V
Output Voltage Tolerance
∆Vo
Over Vin range, Io=1.5A
—
±1.0
±2.0
%Vo
Line Regulation
Regline
Over Vin range
—
±0.2
±0.4
%Vo
Load Regulation
Regload
0.1 ≤ Io ≤ 1.5A
—
±0.1
±0.2
%Vo
Vo Ripple/Noise
Vn
Vin= 9V, Io= 1.5A
Vin= 16V, Io= 1.5A
—
50
80
—
mVpp
mVpp
Transient Response
ttr
50% load change
Vo over/undershoot
—
—
100
30
—
—
µSec
%Vo
Efficiency
η
Vin= 10V, Io= 1A
Vin= 17V, Io= 1A
—
—
85
90
—
—
%
%
Switching Frequency
ƒo
Over Vin range, Io=1.5A
600
650
700
kHz
Absolute Maximum
Operating Temperature Range
Ta
—
-40
—
+85
°C
Recommended Operating
Temperature Range
Ta
Free Air Convection, (40-60LFM)
At Vin= 24V, Io=1.0A
-40
—
+80**
°C
Thermal Resistance
θja
Free Air Convection, (40-60LFM)
—
45
—
°C/W
Storage Temperature
Ts
—
-40
—
+125
°C
Mechanical Shock
—
Per Mil-STD-883D, Method 2002.3
—
500
—
G’s
Mechanical Vibration
—
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
—
5
Weight
—
—
—
6.5
*ISR will operate down to no load with reduced specifications.
2
The 78SR100 is a series of wide input
voltage, 3-terminal Integrated Switching
Regulators (ISRs). These ISRs have a maximum 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 shortcircuit and over-temperature protection, are
very flexible, and may be used in a wide
variety of applications.
Ordering Information
C2
GND
Revised 6/30/98
Vo= 5V
Vo= 12V
Ta = 0°C to +60°C
Vo= 5V
Vo= 12V
Vo= 5V
Vo= 12V
—
—
**See Thermal Derating chart.
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
G’s
grams
(800) 531-5782
For assistance or to order, call
78SR100
CHARACTERISTIC
78SR105_ 5.0 VDC
(See Note 1)
Efficiency vs Output Current
Efficiency vs Output Current
90
Efficiency vs Output Current
90
70
25.0V
30.0V
60
Vin
80
7.0V
10.0V
15.0V
70
20.0V
25.0V
30.0V
60
Efficiency (%)
7.0V
10.0V
15.0V
20.0V
Efficiency (%)
80
0.5
1.0
1.5
0.0
0.5
Iout (A)
Ripple vs Output Current
1.0
0.0
1.5
0.5
1.0
Ripple vs Output Current
Ripple vs Output Current
140
70
Vin
7.0V
10.0V
15.0V
20.0V
25.0V
30.0V
30
20
Ripple (mV)
40
120
60
Vin
7.0V
10.0V
15.0V
20.0V
25.0V
50
40
30
30.0V
100
Ripple (mV)
50
1.5
60
0
0
1.0
14.0V
20.0V
25.0V
30.0V
35.0V
20
10
0
Vin
80
40
20
10
0.0
0.5
Iout (A)
1.0
0.0
1.5
0.5
1.0
Iout (A)
Thermal Derating (Ta)
1.5
Iout (A)
Thermal Derating (Ta)
(See Note 2)
1.6
1.5
Iout (A)
80
0.5
60
Iout (A)
60
0.0
14.0V
20.0V
25.0V
30.0V
35.0V
70
40
40
0.0
Vin
80
50
50
40
(See Note 1)
100
90
Vin
50
Ripple (mV)
78SR112_ 12.0 VDC
(See Note 1)
100
100
Efficiency (%)
DATA
DATA SHEETS
78SR133_ 3.3 VDC
Series
Thermal Derating (Ta)
(See Note 2)
(See Note 2)
1.6
1.6
60°C
1.4
60°C
85°C
70°C
0.8
70°C
1
Iout (A)
1
85°C
0.8
1
85°C
0.8
0.6
0.6
0.6
0.4
0.4
0.4
0.2
0.2
0.2
0
0
9
13
17
21
0
9
25
12
15
18
Vin (Volts)
21
24
27
30
33
36
16
39
19
22
25
Vin (Volts)
Power Dissipation vs Output Current
31
34
37
40
Power Dissipation vs Output Current
1.8
2.5
1.6
1.4
7.0V
10.0V
15.0V
20.0V
25.0V
30.0V
1.0
0.8
0.6
Pd (Watts)
1.2
Vin
1.2
7.0V
10.0V
15.0V
20.0V
25.0V
30.0V
1.0
0.8
0.6
0.4
0.4
0.2
0.2
0.0
2.0
1.4
Vin
0.5
1.0
Iout (A)
1.5
14.0V
20.0V
25.0V
30.0V
35.0V
1.5
1.0
0.5
0.0
0.0
0.0
Vin
Pd (Watts)
1.6
28
Vin (Volts)
Power Dissipation vs Output Current
1.8
Pd (Watts)
60°C
1.2
1.2
Iout (A)
Iout (A)
1.4
1.4
70°C
1.2
0.0
0.5
1.0
1.5
0.0
0.5
Iout (A)
1.0
1.5
Iout (A)
Note 1: All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25°C. 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.)
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
3
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