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78ST305 Datasheet, PDF (1/3 Pages) Texas Instruments – 3 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR | |||
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For assistance or to order, call (800) 531-5782
78ST300 Series
3 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Revised 6/30/98
⢠High Efficiency > 80%
⢠Wide Input Range
⢠Self-Contained Inductor
⢠Short-Circuit Protection
⢠Over-Temperature Protection
⢠Fast Transient Response
Standard Application
Vin
C1
GND
1 78ST300 3
Vout
+
2
C2
GND
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
Pin-Out Information
Pin No. Function
1
Vin
2 GND
3
Vout
The 78ST300 is a series of wide
input voltage, 3 terminal Integrated
Switching Regulators (ISRs). Employ-
ing a ceramic substrate, these ISRs
have a maximum output current of 3A.
The output voltage is laser trimmed
for high accuracy.
The 78ST300 series regulators
have internal short-circuit and over-
temperature protection and may be
used in a wide variety of applications.
Ordering Information
78ST3 XX Y C
Output Voltage
05 = 5.0 Volts
Package Suffix
V = Vertical Mount
H = Horizontal
Mount
(For dimensions and PC board
layout see Package Style 600.)
Specifications
Characteristics
(Ta = 25°C unless noted)
Output Current
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
Ripple/Noise
Transient Response
(with 100µF output cap)
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperature Range
Symbols
Io
Vin
âVo
Regline
Regload
Vn
ttr
η
Æo
Ta
Conditions
Over Vin range
Io = 0.1 to 3.0A
Over Vin range
Ta = 0°C to +60°C
Over Vin range
0.1 ⤠Io ⤠3.0A
Vin = Vin min, Io = 3.0A
50% load change
Vo over/undershoot
Vin = 9V, Io = 3.0A
Over Vin and Io ranges
â
Recommended Operating
Ta
Temperature Range
Thermal Resistance
θja
Storage Temperature
Ts
Mechanical Shock
â
Mechanical Vibration
â
Weight
â
Free Air Convection, (40-60LFM)
Over Vin and Io ranges
Free Air Convection, (40-60LFM)
â
Per Mil-STD-883D, Method 2002.3
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
â
* ISR will operate down to no load with reduced specifications.
** See Thermal Derating chart.
Note: The 78ST300 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
78ST300 SERIES
Min
Typ
0.1*
â
8
â
â
±1.0
â
±0.4
â
±0.2
â
1
â
100
5.0
â
80
0.95
1.0
-40
â
-40
â
â
35
-40
â
â
500
â
10
â
11
Max
Units
3.0
A
20
V
±2.0
%Vo
±0.8
%Vo
±0.4
%Vo
â
%Vo
â
µSec
%Vo
â
%
1.05
MHz
+70
°C
+70**
â
+125
â
â
â
°C
°C/W
°C
Gâs
Gâs
Grams
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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