78HT300 TI

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Technical content

For assistance or to order, call (800) 531-5782 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com

3 AMP POSITIVE STEP-DOWN

INTEGRATED SWITCHING REGULATOR 78HT300 Series Standard Application C1 = Optional 1µF ceramic C2 = Required 100µF electrolytic Pin-Out Information Pin No. Function 1V in

2 GND

Ordering Information

05 = 5.0 Volts 53 = 5.25 Volts Package Suffix V = Vertical Mount H = Horizontal Mount

  • High Efficiency > 80%
  • Wide Input Range
  • Self-Contained Inductor
  • Short-Circuit Protection
  • Over-T emperature Protection
  • Fast T ransient Response The 78HT300 is a series of wide input voltage, 3 terminal Integrated Switching Regulators (ISRs). Em- ploying a ceramic substrate, these ISRs have a maximum output current of 3A. The output voltage is laser- trimmed for high accuracy. The 78HT300 series regulators have internal short-circuit and over- temperature protection and may be used in a wide variety of applications. Specifications Characteristics 78HT300 SERIES (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current I o Over Vin range 0.1* — 3.0 A Input Voltage Range V in Io = 0.1 to 3.0A V o+3 — 28 V Output Voltage Tolerance D Vo Over Vin range — ±1.0 ±2.0 %VoTa = 0°C to +60°C Line Regulation Reg line Over Vin range — ±0.4 ±0.8 %V o Load Regulation Reg load 0.1 £ Io £ 3.0A — ±0.2 ±0.4 %V o Ripple/Noise V n Vin = Vin min, Io = 3.0A — 1 — %Vo Transient Response t tr 50% load change — 100 — µSec (with 100µF output cap) V o over/undershoot 5.0 %V o Efficiency h Vin = 9V, Io = 3.0A — 80 — % Switching Frequency ƒ o Over Vin and Io ranges 700 750 800 kHz Absolute Maximum T a — -40 — +70 °C Operating Temperature Range Recommended Operating T a Free Air Convection, (40-60LFM) -40 — +70** °CTemperature Range Over Vin and Io ranges Thermal Resistance qja Free Air Convection, (40-60LFM) — 35 — °C/W Storage Temperature T s — -40 — +125 °C Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s Mechanical Vibration — Per Mil-STD-883D, Method 2007.2, —1 0—G ’ s20-2000 Hz, soldered in a PC board Weight — — — 11 — Grams * ISR will operate down to no load with reduced specifications. ** See Thermal Derating chart. Note: The 78HT300 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications. 78HT300 Vout GNDGND Vin (For dimensions and PC board layout see Package Style 600.) Revised 6/30/98

For assistance or to order, call (800) 531-5782 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com CHARACTERISTIC DATA 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 Note) 78HT305_ 5.0 VDC (See Note 1) Efficiency vs Output Current Ripple vs Output Current Power Dissipation vs Output Current Efficiency (%)Ripple (mV)PD (Watts) Iout (A) Iout (A) Iout (A) 78HT300 Series Vin Vin Vin 100 8.0V 10.0V 15.0V 20.0V 28.0V 8.0V 10.0V 15.0V 20.0V 28.0V 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 8.0V 10.0V 15.0V 20.0V 28.0V Thermal Derating (Ta) (See Note 2) Iout (A) Vin (Volts) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 8 1 21 62 02 42 8 60°C 70°C 85°C 50°C

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