PT5071—12V 1.5 Amp, 12V Step-Up/Step-Down Integrated Switching Regulator SLTS139 (Revised 2/7/2001) Features Description • Single-Device: +12V Output, 7-16V Input • 84% Efficiency • 14-Pin Excalibur™ Package • Output Current Limit • Adjustable Output Voltage • Adjustable Undervoltage Lockout • Solderable Copper Case The PT5071 is a 1.5-ampere rated step-up/ step-down Integrated Switching Regulator (ISR) that provides a tightly regulated 12V output voltage from a 7V to 16V variable input source. This high-performance ISR has applications in systems where the input voltage straddles the desired 12V output. The regulator has an adjustable output voltage and input start-up threshold, and a standby function for power conservation. Pin-Out Information Ordering Information Pin Function Standard Application U VADJ 2 UVadj V IN 4-6 + V IN PT5071 STBY* 3 GND 7-10 V OUT VOUT 11-13 V 0 adj 14 C1 + C2 STBY GND C1 , C 2 GND = Required 100µF electrolytic (See footnotes) 1 N/C 2 UVLO Adj 3 STBY* 4 Vin 5 Vin 6 Vin 7 GND 8 GND 9 GND 10 GND 11 Vout 12 Vout 13 Vout 14 Vout Adjust PT5071¨ = +12 Volts PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount N A C (For dimensions and PC board layout, see Package Styles 1360 and 1370.) For Inhibit pin: Open = output enabled Ground = output disabled Specifications Characteristics (Ta = 25°C unless noted) Symbols Output Current Current Limit Input Voltage Range Output Voltage Tolerance Io Ilim Vin ∆Vo Output Voltage Adjust Range Line Regulation Load Regulation Vo Ripple/Noise Transient Response with C2 = 100µF Efficiency Switching Frequency Voadj Regline Regload Vn ttr Vos η ƒo Absolute Maximum Operating Temperature Range Storage Temperature Mechanical Shock Ta Ts Mechanical Vibration Weight — Conditions Over Vin Range Vin = 12V 0.1A ≤ Io ≤ Iomax Vin =12V, Io =Iomax –40°C ≤ Ta ≤ +85°C Over Vin Range, Io =Iomax Vin =12V, 0.1 ≤ Io ≤ Iomax Vin =12V, Io =Iomax Load step from 50% to 100% Iomax, Vin=12V Vo over/undershoot Vin =12V, Vo=12V, Io =1.5A Over Vin Range 0.1A ≤ Io ≤ Iomax Over Vin range — Per Mil-STD-883D, Method 2002.3 , 1 msec, Half Sine, mounted to a fixture Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, Soldered in a PC board — Min PT5071 Typ Max Units 0.1 (1) — 7.0 — 4.0 — ±1.0 1.5 A A V % 10 — — — — — — — — ±0.5 ±0.5 ±2.0 200 1.0 83 550 15 ±3.0 — — — — V % % % µSec %Vo % kHz –40 (2) — +85 (3) °C –40 — — TBD +125 — °C G’s — — TBD 25 — — G’s grams 16.0 Notes: 1. The regulator will operate down to no load with reduced specifications. 2. For operating temperatures below 0°C, it is recommended that tantalum capacitors be used at both the input and output. 3. See SOA curves, or contact the factory for derating guidelines. Input/Output Capacitors: The PT5071 regulator requires a 100µF electrolytic capacitor at the input and output for proper operation in all applications. The ESR (equivalent series resistance) of both capacitors must be less than 250mΩ @100kHz. In addition, C1 and C 2 must be rated to a minimum of 300mArms ripple current. For technical support and more information, see inside back cover or visit www.ti.com/powertrends Typical Characteristics PT5071—12V 1.5 Amp, 12V Step-Up/Step-Down Integrated Switching Regulator PT5071 Performance, Vo =12V Safe Operating Area Curves (See Note A) (See Note B) PT5071, Vin =7V Efficiency vs Output Current 90 90.0 Ambient Temperature (°C) 80.0 80 Efficiency - % VIN 7.0V 12.0V 16.0V 70 60 70.0 Airflow 200LFM 120LFM 60LFM Nat conv 60.0 50.0 40.0 30.0 50 20.0 0 0.3 0.6 0.9 1.2 1.5 0.0 0.3 Iout (A) 0.6 0.9 1.2 1.5 Iout (A) Ripple vs Output Current PT5071, Vin =12V 90.0 250 Ambient Temperature (°C) 80.0 Ripple - mV 200 VIN 150 7.0V 12.0V 16.0V 100 50 70.0 Airflow 200LFM 120LFM 60LFM Nat conv 60.0 50.0 40.0 30.0 20.0 0 0 0.3 0.6 0.9 1.2 0.0 1.5 0.3 0.6 0.9 1.2 1.5 Iout (A) Iout (A) PT5071, Vin =16V Power Dissipation vs Output Current 5 90.0 Pd - Watts VIN 3 16.0V 12.0V 7.0V 2 1 Ambient Temperature (°C) 80.0 4 70.0 Airflow 200LFM 120LFM 60LFM Nat conv 60.0 50.0 40.0 30.0 0 20.0 0 0.3 0.6 0.9 Iout (A) 1.2 1.5 0.0 0.3 0.6 0.9 1.2 1.5 Iout (A) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures. 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 products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. 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