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78ST100 Datasheet, PDF (1/6 Pages) Texas Instruments – 1.5 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR | |||
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For assistance or to order, call (800) 531-5782
78ST100 Series
1.5 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Revised 6/30/98
Standard Application
Vin
C1
GND
1 78ST100 3
Vout
+
2
C2
GND
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
⢠Very Small Footprint
⢠High Efficiency > 85%
⢠Self-Contained Inductor
⢠Internal Short-Circuit Protection
⢠Over-Temperature Protection
⢠Fast Transient Response
⢠Wide Input Range
Pin-Out Information
Pin Function
1
Vin
2 GND
3
Vout
The 78ST100 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.
Ordering Information
78ST1 XX Y C
Output Voltage
33 = 3.3 Volts
36 = 3.6 Volts
05 = 5.0 Volts
51 = 5.1 Volts
65 = 6.5 Volts
07 = 7.0 Volts
08 = 8.0 Volts
09 = 9.0 Volts
12 = 12.0 Volts
Package Suffix
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
Specifications
Pkg Style 500
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Output Current
Short Circuit Current
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
Io
Isc
Vin
âVo
Regline
Regload
Over Vin range
Vin = Vin min
0.1 ⤠Io ⤠1.5A
Vo= 3.3V
Vo= 5V
Vo= 12V
Over Vin range, Io=1.5A
Ta = 0°C to +60°C
Over Vin range
0.1 ⤠Io ⤠1.5A
Vo Ripple/Noise
Vn
Transient Response
ttr
(with 100µF output cap)
Efficiency
η
Switching Frequency
Æo
Absolute Maximum
Ta
Operating Temperature Range
Vin= 9V, Io= 1.5A
Vin= 16V, Io= 1.5A
Vo= 5V
Vo= 12V
50% load change
Vo over/undershoot
Vin= 10V, Io= 1A
Vin= 10V, Io= 1A
Vin= 17V, Io= 1A
Vo= 3.3V
Vo= 5V
Vo= 12V
Over Vin range, Io=1.5A
â
Recommended Operating
Ta
Temperature Range
Thermal Resistance
θja
Storage Temperature
Ts
Mechanical Shock
â
Free Air Convection, (40-60LFM)
At Vin= 24V, Io=1.0A
Free Air Convection, (40-60LFM)
â
Per Mil-STD-883D, Method 2002.3
Mechanical Vibration
â
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
Weight
â
â
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note: The 78ST100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
78ST100 SERIES
Min
Typ
0.1*
â
â
3.5
7
â
7
â
14.5
â
â
±1.0
â
±0.2
â
±0.1
â
65
90
â
100
â
5
â
80
â
85
â
90
600
650
-40
â
-40
â
â
45
-40
â
â
500
â
5
â
6.5
Max
1.5
â
26
30
30
±2.0
±0.4
±0.2
â
â
â
â
â
â
700
+85
+80**
â
+125
â
â
â
Units
A
Apk
V
V
V
%Vo
%Vo
%Vo
mVpp
mVpp
µSec
%Vo
%
%
%
kHz
°C
°C
°C/W
°C
Gâs
Gâs
grams
2
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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