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 PT78HT2 XX Function 1 Vi n 2 GND Output Voltage Package Suffix 3 Vout 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 Y Pin Vout 3 C2 High Efficiency: Up to 90% Wide Input Range Self-Contained Inductor Short-Circuit Protection Over-Temperature Protection Fast Transient Response 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 °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 % (3) Typical Characteristics PT78HT200 Series 2 Amp Positive Step-Down Integrated Switching Regulator PT78HT205 5.0 VDC (See Note A) Efficiency vs Output Current 80 9.0V 10.0V 15.0V 70 Efficiency - % VIN 9.0V 12.0V 15.0V 18.0V 24.0V 28.0V 80 70 60 0 0.4 0.8 1.2 1.6 Ripple vs Output Current 0.4 0.8 1.2 1.6 2 50 25 VIN 28.0V 24.0V 18.0V 15.0V 12.0V 9.0V 75 50 25 0 1.6 0 0.4 Iout (A) Power Dissipation vs Output Current 0.8 1.2 1.6 0 1 0.5 VIN 28.0V 24.0V 18.0V 15.0V 12.0V 9.0V 1.5 1 0.5 0 1.6 2 0.4 Iout (A) 0.8 1.2 1.6 Airflow 70.0 200LFM 120LFM Nat conv 60.0 50.0 40.0 30.0 20.0 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 Iout (A) 1 2 Safe Operating Area @Vin =15V (Note B) Ambient Temperature (°C) 80.0 1.2 28.0V 20.0V 15.0V 12.0V 0.5 90.0 0.8 VIN 1.5 Iout (A) Safe Operating Area @Vin =12V (Note B) 2 0 0 90.0 1.6 2 0 1.2 1.2 2.5 Pd - Watts 15.0V 10.0V 9.0V 0.8 Power Dissipation vs Output Current Power Dissipation vs Output Current Pd - Watts 1.5 0.4 0.4 Iout (A) 2 0.0 50 2 VIN 0.8 28.0V 20.0V 15.0V 12.0V 25 2.5 0.4 VIN 75 Iout (A) 2 2 0 2 2.5 1.6 100 0 1.2 1.2 Ripple vs Output Current Ripple - mV 15.0V 10.0V 9.0V Ripple - mV 75 0.8 125 100 VIN 0 0.4 Iout (A) Ripple vs Output Current 100 Pd - Watts 0 125 0.8 70 Iout (A) 125 0.4 12.0V 15.0V 20.0V 28.0V 50 0 2 Iout (A) 0 VIN 80 60 50 50 Ambient Temperature (°C) 90 Ambient Temperature (°C) Efficiency - % VIN 60 Ripple - mV 100 90 90 (See Note A) Efficiency vs Output Current Efficiency vs Output Current 100 100 PT78HT208 8.0 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. 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