For assistance or to order, call (800) 531-5782 5V PT7773 SLTS078 32 AMP HIGH-PERFORMANCE “SLEDGE HAMMER” PROGRAMMABLE ISR (Revised 5/31/2000) Description The PT7773 is one of a series of high-performance, 32 Amp Integrated Switching Regulators (ISRs) housed in a 27-pin SIP package. The 32A capability allows easy integration of the latest high-speed, low-voltage µPs, ASICs, DSPs, and bus drivers into existing 5V systems. The output voltage of the PT7773 is programmable over the low voltage range, 0.8V to 3.1V via a 5-bit input. A differential remote sense is also provided, which automatically compensates for any voltage drop between the ISR and load. An output capacitance of 2400µF is required for proper operation. Pin-Out Information Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 VID4 VIN REMOTE SENSE (+) 6 4 3 2 1 L1 PT7773 7 - 11 1H CIN + 26 27 13 - 19 5 VOUT 20 - 25 12 COUT + LOAD SYNC OUT GND GND STBY* REMOTE SENSE (-) C in = Required 2400µF electrolytic C out = Required 2400µF electrolytic L1 = Optional 1µH input choke 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 13 GND Pin Function 14 GND 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 For STBY* pin; open = output enabled; ground = output disabled. Specifications PT7773 SERIES Characteristics (T a = 25°C unless noted) Symbols Conditions Min Typ Max Output Current Io Ta = +60°C, 200 LFM, pkg N Ta = +25°C, natural convection 0.1 (1) 0.1 (1) — — 32 26 A Input Voltage Range Vin 0.1A ≤ Io ≤ 32A 4.5 — 5.5 V Output Voltage Tolerance ∆Vo Vin = +5V, Io = 32A 0°C ≤ Ta ≤ +55°C Vo-0.03 — Vo+0.03 V Line Regulation Regline 4.5V ≤ Vin ≤ 5.5V, Io = 32A — ±10 — mV Load Regulation Regload Vin = +5V, 0.1 ≤ I o ≤ 32A — ±10 — mV Vo Ripple/Noise pk-pk Vn Vin = +5V, Io = 32A — 50 — mV Transient Response with Cout = 2400µF ttr Vos Io step between 16A and 32A Vo over/undershoot — — 100 200 — — µSec mV Efficiency η Vin = +5V, Io = 20A, Vo = 2.5V — 86 — % Switching Frequency ƒo 4.5V ≤ Vin ≤ 5.5V 0.1A ≤ Io ≤ 32A 650 700 750 kHz Absolute Maximum Operating Temperature Range Ta Over Vin Range 0 — +85 (2) °C Units Storage Temperature Ts — -40 — +125 °C Weight — Vertical/Horizontal — 53/66 — grams Notes: (1) ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected. (2) See SOA curves or consult the factory for the appropriate derating. Output Capacitors: The PT7773 series requires a minimum output capacitance of 2400µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance is 30,000µF. Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1µH. The input capacitance must be rated for a minimum of 2.6Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.ti.com/powertrends For assistance or to order, call (800) 531-5782 5V PT7773 Programming Information Features • +5V input • 5-bit Programmable: 0.8V to 3.1V @32A • High Efficiency • Input Voltage Range: 4.5V to 5.5V • Differential Remote Sense • 27-pin SIP Package VID3 VID2 VID1 VID0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Ordering Information PT7773❏ ❏ = 0.8 to 3.1 Volts VID4=1 VID4=0 Vout Vout 1.6V 1.7V 1.8V 1.9V 2.0V 2.1V 2.2V 2.3V 2.4V 2.5V 2.6V 2.7V 2.8V 2.9V 3.0V 3.1V For dimensions and PC board layout, see Package Style 1020 and 1030 0.80V 0.85V 0.90V 0.95V 1.00V 1.05V 1.10V 1.15V 1.20V 1.25V 1.30V 1.35V 1.40V 1.45V 1.50V 1.55V PT Series Suffix (PT1234X) Case/Pin Configuration N A C Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount Logic 0 = Pin 12 potential (remote sense gnd) Logic 1 = Open circuit (no pull-up resistors) VID3 and VID4 may not be changed while the unit is operating. CHARACTERISTIC DATA Efficiency vs Output Current (@Vout=+2.5V) (See Note A) Safe Operating Area (@Vin=+5V, Vout=+2.5V, Pkg N) (See Note B) 100 Ambient Temperature (°C) 90 Efficiency (%) 90 80 70 60 50 40 80 70 Airflow Nat. Conv 60 60 LFM 120 LFM 200 LFM 50 40 30 20 0 4 8 12 16 20 24 28 32 Output Current (A) 0 4 8 12 16 20 24 28 32 Output Current (A) Power Dissipation vs Output Current (@Vout=+2.5V) 25 Pd (Watts) 20 15 10 5 0 0 4 8 12 16 20 24 28 32 Output Current (A) Output Ripple vs Output Current (@Vout=+2.5V) 25 Ripple (mVpp) 20 15 10 5 0 0 4 8 12 16 20 24 28 32 Output Current (A) Note A: Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical for the ISR. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures. 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