PT78HT200 Series 2 Amp Positive Step-Down Integrated Switching Regulator SLTS057B (Revised 10/15/2000) • • • • • • Standard Application Vin 1 PT78HT200 C1 2 The PT78HT200 is a series of fixed output, wide-input range, 3-terminal Integrated Switching Regulators (ISRs). These ISRs have a maximum output current of 2A. The output voltage is also laser trimmed for high accuracy. Features include excellent line and load regulation, internal short-circuit and over-temperature protection. The PT78HT200 series is available in three package outlines, including horizontal SMD. Their small size and output voltage selection makes these regulators ideal for use in a variety of applications. Pin-Out Information Ordering Information Pin Function 1 Vi n 2 GND 3 Vout PT78HT2 XX Y Vout 3 C2 High Efficiency: Up to 90% Wide Input Range Self-Contained Inductor Short-Circuit Protection Over-Temperature Protection Fast Transient Response + COM Output Voltage Package Suffix 33 = 3.3 Volts 05 = 5.0 Volts 53 = 5.25 Volts 65 = 6.5 Volts 08 = 8.0 Volts V = Vertical Mount S = Surface Mount H = Horizontal Mount COM C1 = Optional 1µF ceramic C2 = Required 100µF electrolytic (1) Pkg Style 500 Specifications PT78HT200 SERIES Characteristics (Ta = 25°C unless noted) Symbols Conditions Min Output Current Io Over Vin range 0.1 (2) Short Circuit Current Isc Vin = Vin min Input Voltage Range Vin 0.1 ≥ Io ≥ 2.0A Vo =3.3V Vo =5.0V Vo =6.5V Vo =8.0V Typ — Max Units 2.0 A — 6.0 — Apk 9 9 10.5 12 — — — — 15 28 28 28 V — ±1.0 ±2.0 %Vo ∆Vo Over Vin range, Io = 2.0A Ta = 0°C to +60°C Line Regulation Regline Over Vin range — ±0.4 ±0.8 %Vo Load Regulation Regload 0.1 ≤ Io ≤ 2.0A — ±0.2 ±0.4 %Vo Vo Ripple/Noise Vn Vin = Vin min, Io = 2.0A — ±1 — %Vo Transient Response (with 100µF output cap) ttr 50% load change Vo over/undershoot — 100 5.0 — µSec %Vo Efficiency η Vin=9V, Io = 2.0A Vin =12V, Io =2.0A Vin =15V, Io =2.0A Vo =3.3V Vo =5.0V Vo =8.0V — — — 80 85 90 — — — % Switching Frequency ƒo Over Vin and Io ranges Vo ≥5.0V Vo =3.3V 700 950 750 1,000 800 1,050 kHz Absolute Maximum Operating Temperature Range Ta Over Vin range -40 — +85 (3) °C Thermal Resistance θja Free Air Convection, (40-60LFM) — 40 — °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 Output Voltage Tolerance Notes: (1) The PT78HT200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications. (2) ISR will operate down to no load with reduced specifications. (3) See Safe Operating Area curves for derating For technical support and more information, see inside back cover or visit www.ti.com/powertrends Typical Characteristics PT78HT200 Series 2 Amp Positive Step-Down Integrated Switching Regulator Efficiency vs Output Current 80 9.0V 10.0V 15.0V 70 9.0V 12.0V 15.0V 18.0V 24.0V 28.0V 80 70 60 60 0 0.4 0.8 1.2 1.6 0.4 75 15.0V 10.0V 9.0V 50 Ripple - mV 1.2 1.6 2 25 1.2 1.6 28.0V 24.0V 18.0V 15.0V 12.0V 9.0V 75 50 0.4 Iout (A) Power Dissipation vs Output Current 0.8 1.2 1.6 0 0.5 VIN 1.6 2 1.5 1 0.4 Iout (A) 0.8 1.2 1.6 200LFM 120LFM Nat conv 60.0 50.0 40.0 30.0 20.0 Iout (A) 1 0 0.4 1.6 2.0 0.8 1.2 1.6 2 Iout (A) Safe Operating Area @Vin =15V (Note B) 90.0 80.0 Airflow 70.0 200LFM 120LFM Nat conv 60.0 50.0 40.0 30.0 80.0 70.0 Airflow 200LFM 120LFM Nat conv 60.0 50.0 40.0 30.0 20.0 20.0 1.2 28.0V 20.0V 15.0V 12.0V 2 Safe Operating Area @Vin =15V (Note B) Ambient Temperature (°C) Airflow 70.0 0.8 VIN 0.5 90.0 80.0 2 1.5 Iout (A) Safe Operating Area @Vin =12V (Note B) 1.6 0 0 90.0 1.2 2 Pd - Watts 28.0V 24.0V 18.0V 15.0V 12.0V 9.0V 0 1.2 0.8 2.5 0.5 0 0.4 0.4 Power Dissipation vs Output Current Power Dissipation vs Output Current Pd - Watts Pd - Watts 1 0.0 50 Iout (A) 2 0.8 28.0V 20.0V 15.0V 12.0V 2 VIN 0.4 VIN 75 25 2.5 15.0V 10.0V 9.0V 2 100 Iout (A) 1.5 1.6 0 0 2 1.2 Ripple vs Output Current VIN 2 2.5 0.8 125 0 0 0.4 Iout (A) 25 0 Ambient Temperature (°C) 0 Ambient Temperature (°C) Ripple - mV 0.8 100 VIN 0.8 70 60 Ripple vs Output Current 125 100 0.4 12.0V 15.0V 20.0V 28.0V Iout (A) Ripple vs Output Current 0 VIN 80 50 0 2 Iout (A) 125 90 50 50 (See Note A) Efficiency vs Output Current 100 VIN 90 VIN Efficiency - % Efficiency - % Efficiency vs Output Current 100 90 PT78HT208 8.0 VDC (See Note A) Ripple - mV 100 PT78HT205 5.0 VDC (See Note A) Efficiency - % PT78HT233 3.3 VDC 0.0 0.4 0.8 1.2 Iout (A) 1.6 2.0 0.0 0.4 0.8 1.2 1.6 2.0 Iout (A) Note A: All characteristic data 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 semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. 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