SLTS061A TI | Alldatasheet
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For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT79SR100 Series -1.5 Amp Negative Step-Down Integrated Switching Regulator
- High Efficiency > 85%
- Self-Contained Inductor
- Short Circuit Protection
- Over-T emperature Protection The PT79SR100 is a 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 volt- ages. They have excellent line and load regulation, and are ideal for applications, such as RS232 and Ethernet communica- tions, ECL logic, and op-amp circuitry. PT79SR1 COMCOM -Vin C1 1 C2D1 -Vout Pin-Out Information Pin Function
1 GND
Ordering Information
05 = -5.0 Volts 52 = -5.2 Volts 06 = -6.0 Volts 08 = -8.0 Volts 09 = -9.0 Volts 12 = -12.0 Volts 15 = -15.0 Volts Package Suffix V = Vertical Mount S = Surface Mount H = Horizontal Mount Standard Application C1 = Optional ceramic (1µF) C2 = Optional ceramic (1-5µF) D1= Zener diode required to clamp turn-on overshoot (See Application Note) Specifications Characteristics PT79SR100 SERIES (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current I o Over Vin range -0.1* — -1.5 A Short Circuit Current I sc Vin=Vo-4V — -3.5 — Apk Input Voltage Range V in Io=-0.1 to -1.5 A V o=-5V -9 — -30 V Output Voltage Tolerance ∆Vo Over Vin range, Io=-1.5 A — ±1.0 ±3.0 %V oTa=-20°C to shutdown Line Regulation Reg line Over Vin range — ±1.0 ±2.0 %V o Load Regulation Reg load -0.1 ≤ Io ≤ -1.5 A — ±0.5 ±1.0 %V o Vo Ripple/Noise V n Vin=-15V, Io=-1.0 A,Vo=-5V — 35 — mV pp Transient Response t tr 50% load change — 100 — µSec Vo=overshoot/undershoot — 30 — %V o Efficiency η Vin=-10V, Io=-1.0A, Vo=-5V — 85 — % Switching Frequency ƒ o Over Vin and Io ranges0.95 1.0 1.05 MHz Absolute Maximum T a -40 — +85 °COperating T emperature Range Recommended Operating T a Free Air Convection, (40-60LFM) -40 — +60** °CTemperature Range Over V in and Io ranges Thermal Resistance θja Free Air Convection, (40-60LFM) — 45 — °C/W Temperature Coefficient T c Over Vin and Io ranges— ±0.5 ±1.5 mV/°C 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, —5 — G’s20-2000 Hz, soldered in a PC board Weight — — — 7.0 — Grams * ISR will operate down to no load with reduced specifications. ** See Thermal Derating chart. Pkg Style 500 SLTS061A (Revised 6/30/2000)
For technical support and more information, see inside back cover or visit www.ti.com/powertrends T ypical Characteristics PT79SR105, -5.0 VDC (See Note 1) PT79SR112, -12.0 VDC (See Note 1) PT79SR115, -15.0 VDC (See Note 1) Efficiency vs Output Current Efficiency vs Output Current Efficiency vs Output Current Ripple vs Output Current Ripple vs Output Current Ripple vs Output Current Power Dissipation vs Output Current Power Dissipation vs Output Current Power Dissipation vs Output Current 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.) Thermal Derating (Ta) (See Note 2) Thermal Derating (Ta) (See Note 2) Thermal Derating (Ta) (See Note 2) Efficiency - %Ripple-(mV)Iout-(Amps)PD-(Watts) Efficiency - %Ripple-(mV)Iout-(Amps)PD-(Watts) Efficiency - %Ripple-(mV)Iout-(Amps)PD-(Watts) Iout-(Amps) Iout-(Amps) Iout-(Amps) Vin-(Volts) Iout-(Amps) Iout-(Amps) Iout-(Amps) Vin-(Volts) Iout-(Amps) Iout-(Amps) Iout-(Amps) Vin-(Volts) 100 10.0V 15.0V 20.0V 25.0V 30.0V Vin 30.0V 25.0V 20.0V 15.0V 10.0V Vin 0.5 1.5 30.0V 25.0V 20.0V 15.0V 10.0V Vin 100 16.0V 20.0V 25.0V 30.0V Vin 0.5 1.5 2.5 30.0V 25.0V 20.0V 16.0V Vin 100 19.0V 21.0V 24.0V 27.0V 30.0V Vin 120 150 30.0V 27.0V 24.0V 21.0V 19.0V Vin 0.2 0.4 0.6 0.8 1.2 1.4 1.6 7 9 11 13 15 17 19 21 23 25 27 29 31 60˚C 70˚C 85˚C 50˚C 0.2 0.4 0.6 0.8 1.2 1.4 1.6 15 17 19 21 23 25 27 29 31 60˚C 70˚C 85˚C 50˚C 0.2 0.4 0.6 0.8 1.2 1.4 1.6 18 20 22 24 26 28 30 60˚C 70˚C 85˚C 50˚C 100 30.0V 25.0V 20.0V 16.0V Vin 0.5 1.5 2.5 30.0V 27.0V 24.0V 21.0V 19.0V Vin PT79SR100 Series -1.5 Amp Negative Step-Down Integrated Switching Regulator
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