For assistance or to order, call (800) 531-5782 78ST100 Series 1.5 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR • • • • • • • 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 Standard Application Vin 1 78ST100 C1 2 GND 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 maximum 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 shortcircuit and over-temperature protection, are very flexible, and may be used in a wide variety of applications. Ordering Information 78ST1 XX Vout 3 C2 Pin Revised 6/30/98 + GND Y C Output Voltage Package Suffix 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 V = Vertical Mount S = Surface Mount H = Horizontal Mount C1 = Optional 1µF ceramic C2 = Required 100µF electrolytic Pkg Style 500 Specifications 78ST100 SERIES Characteristics (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current Io Over Vin range 0.1* — 1.5 A Short Circuit Current Isc Vin = Vin min — 3.5 — Apk Input Voltage Range Vin 0.1 ≤ Io ≤ 1.5A 7 7 14.5 — — — 26 30 30 V V V Output Voltage Tolerance ∆Vo Over Vin range, Io=1.5A — ±1.0 ±2.0 %Vo Line Regulation Regline Over Vin range — ±0.2 ±0.4 %Vo Load Regulation Regload 0.1 ≤ Io ≤ 1.5A — ±0.1 ±0.2 %Vo Vo Ripple/Noise Vn Vin= 9V, Io= 1.5A Vin= 16V, Io= 1.5A — 65 90 — mVpp mVpp Transient Response (with 100µF output cap) ttr 50% load change Vo over/undershoot — — 100 5 — — µSec %Vo Efficiency η Vin= 10V, Io= 1A Vin= 10V, Io= 1A Vin= 17V, Io= 1A — — — 80 85 90 — — — % % % Switching Frequency ƒo Over Vin range, Io=1.5A 600 650 700 kHz Absolute Maximum Operating Temperature Range Ta — -40 — +85 °C Recommended Operating Temperature Range Ta Free Air Convection, (40-60LFM) At Vin= 24V, Io=1.0A -40 — +80** °C Thermal Resistance θja Free Air Convection, (40-60LFM) — 45 — °C/W Vo= 3.3V Vo= 5V Vo= 12V Ta = 0°C to +60°C Vo= 5V Vo= 12V Vo= 3.3V Vo= 5V Vo= 12V Storage Temperature Ts — -40 — +125 °C Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s Mechanical Vibration — Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, soldered in a PC board — 5 — G’s Weight — — — 6.5 — grams *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. 2 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com (800) 531-5782 For assistance or to order, call 78ST100 CHARACTERISTIC 78ST105_ 5.0 VDC (See Note 1) Efficiency vs Output Current Efficiency vs Output Current 90 Efficiency vs Output Current 90 70 60 Vin 80 70 50 40 40 1.0 20.0V 25.0V 30.0V 60 50 0.5 7.0V 10.0V 15.0V 1.5 Efficiency (%) 7.0V 10.0V 15.0V 20.0V 25.0V 30.0V Efficiency (%) 80 60 1.0 0.0 1.5 0.5 1.0 Iout (A) Ripple vs Output Current Ripple vs Output Current Ripple vs Output Current 140 70 Vin 7.0V 10.0V 15.0V 20.0V 25.0V 30.0V 30 20 Ripple (mV) 40 120 60 Vin 7.0V 10.0V 15.0V 20.0V 25.0V 50 40 30 30.0V 100 Ripple (mV) 50 1.5 60 0 0 1.0 14.0V 20.0V 25.0V 30.0V 35.0V 20 10 0 Vin 80 40 20 10 0.0 0.5 Iout (A) 1.0 0.0 1.5 0.5 1.0 Iout (A) Thermal Derating (Ta) 1.5 Iout (A) Thermal Derating (Ta) (See Note 2) 1.6 1.5 Iout (A) 80 0.5 14.0V 20.0V 25.0V 30.0V 35.0V 70 40 0.5 Iout (A) 0.0 Vin 80 50 0.0 60 (See Note 1) 100 90 Vin 0.0 Ripple (mV) 78ST112_ 12.0 VDC (See Note 1) 100 100 Efficiency (%) DATA DATA SHEETS 78ST133_ 3.3 VDC Series Thermal Derating (Ta) (See Note 2) (See Note 2) 1.6 1.6 60°C 1.4 60°C 85°C Iout (A) 70°C 1 0.8 70°C 1 85°C 0.8 1 85°C 0.8 0.6 0.6 0.6 0.4 0.4 0.4 0.2 0.2 0.2 0 0 9 13 17 21 0 9 25 12 15 18 Vin (Volts) 21 24 27 30 33 36 16 39 19 22 25 Vin (Volts) Power Dissipation vs Output Current 31 34 37 40 Power Dissipation vs Output Current 1.8 2.5 1.6 1.4 7.0V 10.0V 15.0V 20.0V 25.0V 30.0V 1.0 0.8 0.6 Pd (Watts) 1.2 Vin 1.2 7.0V 10.0V 15.0V 20.0V 25.0V 30.0V 1.0 0.8 0.6 0.4 0.4 0.2 0.2 0.0 2.0 1.4 Vin 0.5 1.0 Iout (A) 1.5 14.0V 20.0V 25.0V 30.0V 35.0V 1.5 1.0 0.5 0.0 0.0 0.0 Vin Pd (Watts) 1.6 28 Vin (Volts) Power Dissipation vs Output Current 1.8 Pd (Watts) 60°C 1.2 1.2 Iout (A) 1.2 Iout (A) 1.4 1.4 70°C 0.0 0.5 1.0 1.5 0.0 0.5 Iout (A) 1.0 1.5 Iout (A) 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 Notes.) Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com 3 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. 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