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PT7779C Datasheet(PDF) 1 Page - Texas Instruments |
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PT7779C Datasheet(HTML) 1 Page - Texas Instruments |
1 / 3 page For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT7779 4 321 26 20-25 12 5 13-19 27 7-11 L O A D C OUT + C IN + PROGRAMMING PINS V IN V OUT SYNC OUT GND REMOTE SENSE(+) REMOTE SENSE(–) STBY* VID0 VID1 VID2 VID3 L1 1µH GND VID4 6 Standard Application Cin = Required 2400µF electrolytic Cout = Required 330µF electrolytic L1 = Optional 1µH input choke Description The PT7779 is a high-output 32A Integrated Switching Regulator (ISR), housed in a 27-pin SIP package. The PT7779 is the next generation of the industry benchmark PT7771. The PT7779 includes short circuit pro- tection and requires only 330µF of output capacitance for proper oper- ation. The 32A output capability allows the easy integration of the latest high-speed, µPs, ASICs, DSPs into existing 5V systems. For additional current, the PT7779 is designed to operate with up to two PT7741 32A compatible current boosters. The output voltage is programmable from 1.3V to 3.5V using a 5-bit input, that is compatible with Intel’s Pentium® II Processors. A differential remote sense compensates for any voltage drop between the ISR and load. For STBY* pin; open = output enabled; ground = output disabled. Pin-Out Information Pin Function 1 VID0 2 VID1 3 VID2 4 VID3 5 STBY*- Stand-by 6 VID4 7 Vin 8 Vin 9 Vin 10 Vin 11 Vin 12 Remote Sense Gnd (3) 13 GND 14 GND Pin Function 15 GND 16 GND 17 GND 18 GND 19 GND 20 Vout 21 Vout 22 Vout 23 Vout 24 Vout 25 Vout 26 Remote Sense Vout 27 Sync Out SLTS116 (Revised 8/31/2000) PT7779—5V 32 Amp Programmable Integrated Switching Regulator Specifications Characteristics PT7779 (T a = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current Io Ta = +60°C, 200 LFM, pkg N 0.1 (1) —31 A Ta = +25°C, natural convection 0.1 (1) —32 Input Voltage Range Vin 0.1A ≤ Io ≤ 32A 4.5 — 5.5 V Output Voltage Tolerance ∆Vo Vin = +5V, Io = 32A Vo-0.03 — Vo+0.03 V –40°C ≤ Ta ≤ +85°C Line Regulation Regline 4.5V ≤ Vin ≤ 5.5V, Io = 32A — ±10 — mV Load Regulation Regload Vin = +5V, 0.1 ≤ Io ≤ 32A — ±10 — mV Vo Ripple/Noise pk-pk Vn Vin = +5V, Io = 32A — 50 — mV Transient Response ttr Io step between 16A and 32A — 100 — µSec with Cout = 330µF Vos Vo over/undershoot — 200 — mV Efficiency η Vin = +5V, Io = 20A, Vo = 3.3V — 90 — % Switching Frequency ƒo 4.5V ≤ Vin ≤ 5.5V 300 350 400 kHz 0.1A ≤ Io ≤ 32A Absolute Maximum Ta Over Vin Range –40 — +85 (2) °C Operating Temperature Range Storage Temperature Ts — -40 — +125 °C Mechanical Vibration Per Mil-STD-883D, Method 2007.2, — 10/15 — G’s 20-20,000Hz, Soldered in a PC board Weight — Vertical/Horizontal — 53/66 — grams Notes: (1) ISR-will operate down to no load with reduced specifications. (2) Consult the Safe Operating Area curves, or contact the factory for the appropriate derating. (3) If the remote sense ground is not used, pin 12 must be connected to pin13 for optimum output voltage accuracy. External Capacitors: The PT7779 requires a minimum output capacitance of 330µF for proper operation. The PT7779 also requires an input capacitance of 2400µF, which must be rated for a minimum of 2.0Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For further infor- mation, see the accompanying application note on capacitor selection for this product. Input Filter: An input filter inductor is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1µH. |
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