For assistance or to order, call Application Notes Mechanical Outline Product Selector Guide (800) 531-5782 PT79SR100 S e r i e s -1.5 AMP NEGATIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR • • • • Standard Application COM High Efficiency > 85% Self-Contained Inductor Short Circuit Protection Over-Temperature Protection The PT79SR100 Series is a new line of Negative Input/Negative Output 3-terminal Integrated Switching Regulators (ISRs). These ISRs have a maximum output current of -1.5 Amps and an output voltage that is laser trimmed to most industry standard voltages. They have excellent line and load regulation, and are ideal for applications, such as RS232 and Ethernet communications, ECL logic, and op-amp circuitry. Pin-Out Information Ordering Information PT79SR1 D1 1 -Vin 2 PT79SR1 Function 1 GND 2 -Vin Output Voltage Package Suffix 3 -Vout 05 = -5.0 Volts 52 = -5.2 Volts 08 = -8.0 Volts 09 = -9.0 Volts 12 = -12.0 Volts 15 = -15.0 Volts V = Vertical Mount S = Surface Mount H = Horizontal Mount C2 -Vout 3 Y XX Pin COM C1 Revised 5/15/98 C1 = Optional ceramic (1µF) C2 = Optional ceramic (1-5µF) D1 = Zener diode required to clamp turn-on overshoot (See Application Note) Pkg Style 500 Specifications PT79SR100 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=Vo-4V — -3.5 — Apk Input Voltage Range Vin Io=-0.1 to -1.5 A -0.1 ≥ Io ≥ -1.5 A -9 -19 — — -30 -30 V V Output Voltage Tolerance ∆Vo Over Vin range, Io=-1.5 A Ta=-20°C to shutdown — ±1.0 ±3.0 %Vo Line Regulation Regline Over Vin range — ±1.0 ±2.0 %Vo Load Regulation Regload -0.1 ≤ Io ≤ -1.5 A — ±0.5 ±1.0 %Vo Vo Ripple/Noise Vn Vin=-15V, Io=-1.0 A,Vo=-5V — 35 — mVpp Transient Response ttr 50% load change Vo=overshoot/undershoot — — 100 30 — — µSec %Vo Efficiency η Vin=-10V, Io=-1.0A, Vo=-5V — 85 — % Switching Frequency ƒo Over Vin and Io ranges 0.95 1.0 1.05 MHz Absolute Maximum Operating Temperature Range Ta -40 — +85 °C Recommended Operating Temperature Range Ta Free Air Convection, (40-60LFM) Over Vin and Io ranges -40 — +60** °C Thermal Resistance θja Free Air Convection, (40-60LFM) — 45 — °C/W Temperature Coefficient Tc Over Vin and Io ranges — ±0.5 ±1.5 mV/°C 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 — — — 7.0 — Grams * ISR will operate down to no load with reduced specifications. 22 Vo=-5V Vo=-15V ** See Thermal Derating chart. 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 PT79SR100 S e r i e s CHARACTERISTIC Efficiency vs Output Current Efficiency vs Output Current 100 Efficiency vs Output Current Vin 9V 10.0V 15.0V 20.0V 25.0V 30.0V 80 70 60 90 Vin 16.0V 80 20.0V 70 25.0V 60 Efficiency - % 90 50 0.5 0.75 1 1.25 0 0.25 0.5 Iout-(Amps) 1 1.25 1.25 80 Vin 30.0V 60 25.0V 20.0V 0.5 0.75 1 1.25 0.6 19.0V 50˚C 0.75 0 0 70˚C 85˚C 50˚C 1.2 70˚C 1 0.8 0.6 85˚C 0 17 19 21 23 25 27 29 31 18 20 22 Power Dissipation vs Output Current 0.5 2 1.5 25.0V 20.0V 1 16.0V 1.5 Vin 2 30.0V 27.0V 24.0V 21.0V 19.0V 1.5 1 0 0 1.25 30 0.5 0.5 0 28 2.5 Vin 30.0V PD-(Watts) PD-(Watts) 1 26 Power Dissipation vs Output Current 2.5 30.0V 25.0V 20.0V 15.0V 10.0V 9V 24 Vin-(Volts) Vin 1.5 (See Note 2) 60˚C Vin-(Volts) 2 1.5 0.2 Vin-(Volts) Power Dissipation vs Output Current 1.25 0.4 15 9 11 13 15 17 19 21 23 25 27 29 31 1 1.4 0.6 0.2 Iout-(Amps) 0.5 1.6 60˚C 0.8 0.2 1 0.25 Thermal Derating (Ta) (See Note 2) 1 0.4 0.75 21.0V 0 1.2 0.4 0.5 24.0V 60 Iout-(Amps) Iout-(Amps) 0.8 0.25 27.0V Iout-(Amps) 1.4 70˚C 0 30.0V 90 1.5 1.6 85˚C 7 Vin 0 0.25 Thermal Derating (Ta) 50˚C 60˚C 1 1.5 30 0 1.5 (See Note 2) 1.4 1.25 120 Iout-(Amps) 1.6 1 150 Iout-(Amps) 1.2 0.75 Ripple vs Output Current 0 Thermal Derating (Ta) 0.5 16.0V 0 1 0.25 Iout-(Amps) 40 10 PD-(Watts) 0 20 0.75 30.0V 1.5 Ripple-(mV) 30 Ripple-(mV) Ripple-(mV) Vin 30.0V 25.0V 20.0V 15.0V 10.0V 9V 40 20 Iout-(Amps) 0.75 100 50 0.5 27.0V Ripple vs Output Current 60 0.25 24.0V Iout-(Amps) Ripple vs Output Current 0 21.0V 70 40 40 1.5 19.0V 80 50 40 0.25 Vin 90 60 30.0V 50 0 (See Note 1) 100 100 Efficiency - % Efficiency - % PT79SR115, -15.0 VDC (See Note 1) 0 0.25 0.5 0.75 1 1.25 1.5 0 0.25 0.5 Iout-(Amps) 0.75 1 1.25 1.5 Iout-(Amps) 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 soldered in a printed circuit board. (See Thermal Application Notes.) Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com 23 DATA SHEETS PT79SR112, -12.0 VDC (See Note 1) Wide Input Range Products PT79SR105, -5.0 VDC DATA 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. 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