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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
The 78ST300 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 3A. The output voltage is laser trimmed for high accuracy. The 78ST300 series regulators have internal short-circuit and overtemperature protection and may be used in a wide variety of applications.
Pin-Out Information Standard Application
Vin
1
Ordering Information
Pin No. Function
1 2 Vin GND Vout
78ST3 XX
Output Voltage 05 = 5.0 Volts
YC
Package Suffix V = Vertical Mount H = Horizontal Mount
78ST300
2
3
Vout + GND
3
C1 GND
C2
(For dimensions and PC board layout see Package Style 600.)
C1 = Optional 1F ceramic C2 = Required 100F electrolytic
Specifications
Characteristics (Ta = 25C unless noted) Output Current Input Voltage Range Output Voltage Tolerance Line Regulation Load Regulation Ripple/Noise Transient Response (with 100F output cap) Efficiency Switching Frequency Absolute Maximum Operating Temperature Range Recommended Operating Temperature Range Thermal Resistance Storage Temperature Mechanical Shock Mechanical Vibration Weight
** See Thermal Derating chart.
78ST300 SERIES
Symbols Io Vin V o Regline Regload Vn ttr o Ta Ta Conditions Over Vin range Io = 0.1 to 3.0A Over Vin range
Ta = 0C to +60C
Min 0.1* 8 -- -- -- -- -- -- 0.95 -40
Typ -- -- 1.0 0.4 0.2 1 100 5.0 80 1.0 --
Max 3.0 20 2.0 0.8 0.4 -- -- -- 1.05 +70
Units A V %Vo %Vo %Vo %Vo Sec %Vo % MHz 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 -- Free Air Convection, (40-60LFM) Over Vin and Io ranges Free Air Convection, (40-60LFM) -- Per Mil-STD-883D, Method 2002.3 Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, soldered in a PC board --
-40 -- -40 -- -- --
-- 35 -- 500 10 11
+70** -- +125 -- -- --
C C/W C G's G's Grams
ja
Ts -- -- --
* ISR will operate down to no load with reduced specifications.
Note: The 78ST300 Series requires a 100F 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
For assistance or to order, call
(800) 531-5782
78ST300
CHARACTERISTIC DATA
Series
78ST305_ 5.0 VDC
(See Note 1)
Efficiency vs Output Current
100 90
Efficiency (%)
80 70 60 50 40 0.0 0.5 1.0 1.5 2.0 2.5 3.0
Vin
7.5V 9.0V 12.0V 15.0V 20.0V
Iout (A)
Ripple vs Output Current
40 35 30
Vin
7.5V 9.0V 12.0V 15.0V 20.0V
Ripple (mV)
25 20 15 10 5 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0
Iout (A)
Thermal Derating (Ta)
3.0 2.5
(See Note 2)
50C 60C 70C
2.0
85C
Iout (A)
1.5
1.0
0.5
0.0 8 10 12 14 16 18 20
Vin (Volts)
Power Dissipation vs Output Current
4.0 3.5 3.0
Vin
7.5V 9.0V 12.0V 15.0V 20.0V
PD (Watts)
2.5 2.0 1.5 1.0 0.5 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0
Iout (A)
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 Note)
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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Copyright (c) 1999, Texas Instruments Incorporated

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