PT78NR100 Series 1 Amp Plus to Minus Voltage Integrated Switching Regulator SLTS058B (Revised 8/31/2000) • • • • • • Negative output from positive input Wide Input Range Self-Contained Inductor Short Circuit Protection Over-Temperature Protection Fast Transient Response Pin-Out Information Standard Application Vin C1 1 PT78NR100 + 3 Function 1 +Vin 2 -Vout 3 GND -Vout 2 C2 Pin + COM COM C1 = Required 100µF electrolytic (1) C2 = Required 100µF electrolytic (1) Specifications Pkg Style 500 The PT78NR100 Series creates a negative output voltage from a positive input voltage greater than 7V. These easy-to-use, 3-terminal, Integrated Switching Regulators (ISRs) have maximum output power of 5 watts and a negative output voltage that is laser trimmed. They also have excellent line and load regulation. Ordering Information PT78NR1 XX Y Output Voltage Package Suffix 03 = -3.0 Volts 05 = -5.0 Volts 52 = -5.2 Volts 06 = -6.0 Volts 07 = -7.0 Volts 08 = -8.0 Volts 09 = -9.0 Volts 10 = -10.0 Volts 12 = -12.0 Volts 14 = -13.9 Volts 15 = -15.0 Volts V = Vertical Mount S = Surface Mount H = Horizontal Mount PT78NR100 SERIES Characteristics (Ta= 25°C unless noted) Symbols Conditions Output Current Io Over Vin range Vo=-5V Vo=-6V Vo=-7, -8, -9V Vo=-10V Vo=-12V Vo=-13.9, -15V Min Typ Max Units 0.05 (2) 0.05 (2) 0.05 (2) 0.05 (2) 0.05 (2) 0.05 (2) — — — — — — 1.00 0.8 0.55 0.5 0.40 0.30 A Short Circuit Current Isc Vin=10V — 4×Imax — Apk Inrush Current Iir tir Vin=10V On start-up — — 4 0.5 — — A mSec Input Voltage Range Vin 0.1 ≤ Io ≤ Imax 7 7 7 7 — — — — 25 21 18 15 V V V V Output Voltage Tolerance ∆Vo Over Vin range Ta=-20°C to +70°C — ±1.0 ±3.0 %Vo Line Regulation Regline Over Vin range — ±0.5 ±1.0 %Vo Load Regulation Regload 0.1 ≤ Io ≤ Imax — ±0.5 ±1.0 %Vo Vo Ripple/Noise Vn Vin=10V, Io=Imax — ±2 — %Vo Transient Response (with 100µF output cap) ttr 50% load change Vo over/undershoot — — 100 5.0 250 — µSec %Vo % Vo=-5V Vo=-6, -7, -8, -9V Vo=-10, -12V Vo=-13.9, -15V Efficiency η Vin=10V, Io=0.5×Imax, Vo = -5V — 75 — Switching Frequency ƒo Over Vin and Io ranges 600 650 700 kHz Absolute Maximum Operating Temperaturte Range Ta Free Air Convection, (40-60LFM) Over Vin Range -40 — +85 (3) °C Thermal Resistance θja Free Air Convection, (40-60LFM) — 45 — °C/W 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 Notes: (1) The PT78NR100 Series requires a 100µF electrolytic or tantalum capacitor at both the input and output for proper operation in all applications. The input capacitor, C1 must have a ripple current rating ≥600 mArms, and an ESR ≤0.2Ω. (2) The ISR will operate down to no load with reduced specifications. (3) See Thermal Derating chart. For technical support and more information, see inside back cover or visit www.ti.com/powertrends Typical Characteristics PT78NR100 Series 1 Amp Plus to Minus Voltage Integrated Switching Regulator PT78NR105 -5.0 VDC PT78NR109 -9.0 VDC (See Note A) Efficiency vs Output Current 100 90 90 90 Vin 7.0V 12.0V 15.0V 20.0V 25.0V 70 60 80 Efficiency - % 100 80 Vin 7.0V 70 12.0V 15.0V 18.0V 60 21.0V 50 (See Note A) Efficiency vs Output Current 100 Efficiency - % Efficiency - % Efficiency vs Output Current PT78NR112 -12.0 VDC (See Note A) VIN 80 7.0V 9.0V 12.0V 15.0V 18.0V 70 60 50 50 40 0 0.2 0.4 0.6 0.8 40 1 40 0 0.1 0.2 0.3 0.4 0.5 0 Ripple vs Output Current 160 200 VIN 21.0V 120 18.0V 15.0V 12.0V 80 7.0V Ripple - mV Ripple-(mV) Vin 25.0V 20.0V 15.0V 12.0V 7.0V 80 0.4 250 Vin 120 0.3 Ripple vs Output Current 200 160 0.2 Iout-(Amps) Ripple vs Output Current 200 Ripple-(mV) 0.1 Iout-(Amps) Iout-(Amps) 18.0V 15.0V 12.0V 9.0V 7.0V 150 100 40 50 40 0 0 0.2 0.4 0.6 0.8 1 0 0 0 0.1 0.2 0.4 0 0.5 0.1 Thermal Derating (Ta) (See Note B) 1 60°C Thermal Derating (Ta) (See Note B) 0.4 0.6 70°C 0.9 0.2 0.3 0.4 Iout-(Amps) Iout-(Amps) Iout-(Amps) Thermal Derating (Ta) 0.3 70°C (See Note B) 70°C 0.35 0.5 0.8 85°C 0.6 0.5 0.4 Iout-(Amps) Iout-(Amps) Iout-(Amps) 0.3 0.7 0.4 85°C 0.3 0.2 0.3 0.25 85°C 0.2 0.15 0.1 0.2 0.1 0.1 0.05 0 0 7 10 13 16 19 22 25 0 7 11 15 Vin-(Volts) 19 7 10 13 Vin-(Volts) Power Dissipation vs Output Current Power Dissipation vs Output Current 2 1.6 1.8 1.4 16 19 Vin-(Volts) Power Dissipation vs Output Current 1.6 1.4 1.6 1.2 Vin 20.0V 15.0V 1 12.0V 0.8 7.0V 1 21.0V 18.0V 1.2 0.8 15.0V 12.0V 0.6 7.0V 0.6 Pd - Watts 25.0V 1.2 Vin PD-(Watts) PD-(Watts) 1.4 VIN 18.0V 15.0V 12.0V 9.0V 7.0V 1 0.8 0.6 0.4 0.4 0.4 0.2 0.2 0.2 0 0 0 0.2 0.4 0.6 0.8 1 0 0.1 0.2 0.3 0.4 0.5 0 0 Iout-(Amps) Iout-(Amps) 0.1 0.2 0.3 0.4 Iout-(Amps) Note A: 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 B: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.) For technical support and more information, see inside back cover or visit www.ti.com/powertrends 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 acknowledgment, 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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