PT78ST100 Series 1.5 Amp Positive Step-Down Integrated Switching Regulator SLTS059A (Revised 6/30/2000) • • • • • • • Very Small Footprint High Efficiency > 85% Self-Contained Inductor Internal Short-Circuit Protection Over-Temperature Protection Fast Transient Response Wide Input Range The PT78ST100 is a series of wideinput range, 3-terminal regulators. Pin-Out Information Standard Application Vin 1 PT78ST100 C1 2 COM Function 1 Vin 2 GND 3 Vout Ordering Information PT78ST1 XX Y Vout 3 C2 Pin + COM C1 = Optional 1µF ceramic C2 = Required 100µF electrolytic Pkg Style 500 Specifications These ISRs have a maximum output current of 1.5 Amps and an output voltage that is laser trimmed to a variety of industry standard voltages. These 78 series regulators have excellent line and load regulation with internal short- circuit and over-temperature protection, and are offered in a variety of standard output voltages. These ISRs are very flexible and may be used in a wide variety of applications. Output Voltage Package Suffix 33 = 3.3 Volts 36 = 3.6 Volts 05 = 5.0 Volts 51 = 5.1 Volts 53 = 5.25 Volts 06 = 6.0 Volts 65 = 6.5 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 PT78ST100 SERIES Characteristics (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current Io Over Vin range 0.1* — 1.5 A Short Circuit Current Isc Vin = Vin min Input Voltage Range Vin 0.1 ≤ Io ≤ 1.5A Output Voltage Tolerance ∆Vo Over Vin range, Io=1.5A Line Regulation Regline Over Vin range — ±0.2 ±0.4 %Vo Load Regulation Regload 0.1 ≤ Io ≤ 1.5A — ±0.1 ±0.2 %Vo Vo Ripple/Noise Vn Vin= 9V, Io= 1.5A Vin= 16V, Io= 1.5A — 65 90 — mVpp mVpp Transient Response (with 100µF output cap) ttr 50% load change Vo over/undershoot — — 100 5 — — µSec %Vo Efficiency η Vin= 10V, Io= 1A Vin= 10V, Io= 1A Vin= 17V, Io= 1A — — — 80 85 90 — — — % % % Switching Frequency ƒo Over Vin range, Io=1.5A 600 650 700 kHz Absolute Maximum Operating Temperature Range Ta — -40 — +85 °C Recommended Operating Temperature Range Ta Free Air Convection, (40-60LFM) At Vin= 24V, Io=1.0A -40 — +80** °C Thermal Resistance θja Free Air Convection, (40-60LFM) — 45 — °C/W Storage Temperature Ts — -40 — +125 °C — 500 — G’s G’s grams Vo= 3.3V Vo= 5V Vo= 12V Ta = 0°C to +60°C Vo= 5V Vo= 12V Vo= 3.3V Vo= 5V Vo= 12V — 3.5 — Apk 9 9 16 — — — 26 38 38 V V V — ±1.0 ±2.0 %Vo Mechanical Shock — Per Mil-STD-883D, Method 2002.3 Mechanical Vibration — Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, soldered in a PC board — 5 — Weight — — — 6.5 — *ISR will operate down to no load with reduced specifications. **See Thermal Derating chart. Note: The PT78ST100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications. For technical support and more information, see inside back cover or visit www.ti.com/powertrends Typical Characteristics PT78ST100 Series 1.5 Amp Positive Step-Down Integrated Switching Regulator PT78ST105, 5.0 VDC (See Note 1) Efficiency vs Output Current 100 100 90 90 80 Vin 9.0V 70 12.0V 15.0V 60 20.0V Efficiency - % Efficiency - % Efficiency vs Output Current PT78ST112, 12.0 VDC (See Note 1) (See Note 1) Efficiency vs Output Current 100 90 Efficiency - % PT78ST133, 3.3 VDC Vin 80 9.0V 12.0V 18.0V 24.0V 30.0V 38.0V 70 60 Vin 80 16.0V 18.0V 70 24.0V 30.0V 38.0V 60 26.0V 50 50 40 40 0 0.25 0.5 0.75 1 1.25 1.5 50 40 0 0.25 0.5 Iout-(Amps) 0.75 1 1.25 0 1.5 Ripple vs Output Current Ripple vs Output Current 12.0V 40 9.0V 90 60 0 0 0.75 1 1.25 0.25 0.5 Iout-(Amps) Thermal Derating (Ta) 150 30.0V 24.0V 18.0V 100 16.0V 50 0 0 1.5 Vin 38.0V 30 20 0.75 1 1.25 1.5 0 0.25 0.5 0.75 Thermal Derating (Ta) (See Note 2) 1 1.25 1.5 Iout-(Amps) Iout-(Amps) 1.6 1.5 200 38.0V 30.0V 24.0V 18.0V 12.0V 9.0V Ripple-(mV) 15.0V Ripple-(mV) Ripple-(mV) 20.0V 1.25 250 Vin 26.0V 60 1 Ripple vs Output Current Vin 0.5 0.75 300 120 80 0.25 0.5 Iout-(Amps) 150 100 0 0.25 Iout-(Amps) Thermal Derating (Ta) (See Note 2) (See Note 2) 1.6 1.6 60°C 1.4 Iout-(Amps) 1.2 85°C 1 0.8 0.6 1.4 1.2 70°C Iout-(Amps) 70°C 1.2 Iout-(Amps) 60°C 1.4 1 85°C 0.8 0.6 0.4 70°C 60°C 85°C 1 0.8 0.6 0.4 0.4 0.2 0.2 0.2 0 0 9 0 9 13 17 21 12 15 18 21 24 27 30 33 36 39 16 19 22 25 28 31 34 37 40 25 Vin-(Volts) Vin-(Volts) Power Dissipation vs Output Current Vin-(Volts) Power Dissipation vs Output Current 1.8 Power Dissipation vs Output Current 3 2.5 1.6 2.5 2 1.4 26.0V 20.0V 1 15.0V 0.8 12.0V 0.6 9.0V 0.4 38.0V 30.0V 24.0V 18.0V 12.0V 9.0V 1.5 1 PD-(Watts) 1.2 Vin PD-(Watts) PD-(Watts) Vin 2 Vin 1.5 38.0V 1 30.0V 24.0V 18.0V 16.0V 0.5 0.5 0.2 0 0 0 0 0.25 0.5 0.75 1 Iout-(Amps) 1.25 1.5 0 0 0.25 0.5 0.75 1 1.25 0.25 0.5 0.75 1 1.25 1.5 1.5 Iout-(Amps) Iout-(Amps) 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. (See Thermal Application Notes.) For technical support and more information, see inside back cover or visit www.ti.com/powertrends I MPORTANT NOTI CE Te xas Instrume nts and its subsidiarie s (TI) re se rve the right to make change s to the ir products or to discontinue any product or se rvice without notice , and advise custome rs to obtain the late st ve rsion of re le vant information to ve rify, be fore placing orde rs, that information be ing re lie d on is curre nt and comple te . All products are sold subje ct to the te rms and conditions of sale supplie d at the time of orde r acknowle dgme nt, including those pe rtaining to warranty, pate nt infringe me nt, and limitation of liability. TI warrants pe rformance of its se miconductor products to the spe cifications applicable at the time of sale in accordance with TI’s standard warranty. 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