For assistance or to order, call (800) 531-5782
7 8 S T 2 0 0 S e r i e s
2 AMP POSITIVE STEP-DOWN |
Revised 6/30/98 |
INTEGRATED SWITCHING REGULATOR |
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•High Efficiency > 82%
•Wide Input Range
•Self-Contained Inductor
•Short-Circuit Protection
•Over-Temperature Protection
•Fast Transient Response
The 78ST200 is a series of wide input voltage, 3 terminal Integrated Switching Regulators (ISRs). Employing a ceramic substrate, these ISRs have a maximum output current of 2A. The output voltage is laser trimmed for high accuracy.
The 78ST200 series regulators have internal short-circuit and overtemperature protection and may be used in a wide variety of applications.
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Pin-Out Information |
Ordering Information |
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Pin No. Function |
78ST2 XX |
Y C |
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Standard Application |
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1 |
Vin |
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2 |
GND |
Output Voltage |
Package Suffix |
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3 |
Vout |
33 = 3.3 Volts |
V = Vertical Mount |
Vin |
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Vout |
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1 |
78ST200 |
3 |
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35 = 3.45 Volts |
S = Surface Mount |
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05 = 5.0 Volts |
H = Horizontal |
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C1 |
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2 |
C2 |
+ |
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Mount |
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GND |
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GND |
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C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
(For dimensions and PC board layout see Package Style 500.)
Specifications
Characteristics |
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78ST200 SERIES |
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(Ta = 25°C unless noted) |
Symbols |
Conditions |
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Min |
Typ |
Max |
Units |
Output Current |
Io |
Over Vin range |
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0.1* |
— |
2.0 |
A |
Input Voltage Range |
Vin |
Io = 0.1 to 3.0A |
Vo < 3.5V |
7 |
— |
15 |
V |
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Vo = 5.0V |
8 |
— |
20 |
V |
Output Voltage Tolerance |
Vo |
Over Vin range, Io = 2.0A |
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±1.0 |
±2.0 |
%Vo |
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Ta = 0°C to +60°C |
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Line Regulation |
Regline |
Over Vin range |
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±0.4 |
±0.8 |
%Vo |
Load Regulation |
Regload |
0.1 ≤ Io ≤ 2.0A |
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±0.2 |
±0.4 |
%Vo |
Ripple/Noise |
Vn |
Vin = Vin min, Io = 2.0A |
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1 |
— |
%Vo |
Transient Response |
ttr |
50% load change |
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100 |
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µSec |
(with 100µF output cap) |
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Vo over/undershoot |
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5.0 |
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%Vo |
Efficiency |
η |
Vin = 9V, Io = 2.0A, Vo = 5V |
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82 |
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% |
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Switching Frequency |
ƒo |
Over Vin and Io ranges |
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0.95 |
1.0 |
1.05 |
MHz |
Absolute Maximum |
Ta |
— |
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-40 |
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+85 |
°C |
Operating Temperature Range |
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Recommended Operating |
Ta |
Free Air Convection, (40-60LFM) |
-40 |
— |
+85** |
°C |
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Temperature Range |
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Over Vin and Io ranges |
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Thermal Resistance |
θja |
Free Air Convection, (40-60LFM) |
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38 |
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°C/W |
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Storage Temperature |
Ts |
— |
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-40 |
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+125 |
°C |
Mechanical Shock |
— |
Per Mil-STD-883D, Method 2002.3 |
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500 |
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G’s |
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Mechanical Vibration |
— |
Per Mil-STD-883D, Method 2007.2, |
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5 |
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G’s |
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20-2000 Hz, soldered in a PC board |
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Weight |
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7 |
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Grams |
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note: The 78ST200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com