PT7772—3.3V 32 Amp “Sledge Hammer” Programmable ISR SLTS055A (Revised 6/30/2000) The PT7772 is a high-output Integrated Switching Regulator (ISR) housed in a 27-pin SIP package. The PT7772 operates from a 3.3V bus to provide a 32 amp low-voltage power source for the industry’s latest highspeed µPs, ASICs, DSPs. The PT7772 has been designed to work in parallel with one or more of the PT7746 -32A current boosters to increase the load current capability in increments of 32A. The output voltage is programmable from 1.3V to 2.05V with a 4-bit input, compatible with Intel’s Pentiumâ Pro Processor. A differential remote sense is also provided, to compensate for voltage drop between the ISR and load. The PT7772 requires a capacitance of 2400µF at the input, and 680µF at the output for proper operation. Note that this product does not include short circuit protection. Pin-Out Information Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 REMOTE SENSE (+) 4 3 2 1 VIN L1 PT7772 7 - 11 1H C IN + 26 27 13 - 19 5 VOUT 20 - 25 12 C OUT + LOAD SYNC OUT GND GND STBY* REMOTE SENSE (-) Cin = Required 2400µF electrolytic Cout = Required 680µF electrolytic L1 = Optional 1µH input choke 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 Pin Function 1 VID0 2 VID1 3 VID2 4 VID3 5 STBY*- Stand-by 6 Do not connect 7 Vin 8 Vin 9 Vin 10 Vin 11 Vin 12 Remote Sense Gnd 13 GND For STBY* pin; Open = output enabled Gnd = output disabled. Specifications Characteristics (T a = 25°C unless noted) PT7772 SERIES Symbols Conditions Typ Max Units Output Current Io Ta = +60°C, 200 LFM, pkg N Ta = +25°C, natural convection 0.1 0.1 (1) (1) — — 32 26 A A Input Voltage Range Vin 0.1A ≤ Io ≤ 32A 3.1 (2) — 3.6 V Output Voltage Tolerance ∆Vo Vin = +3.3V, Io = 32A 0°C ≤ Ta ≤ +55°C Vo-0.03 — Vo+0.03 V Line Regulation Regline 3.1V ≤ Vin ≤ 3.6V, Io = 32A — ±10 — mV Load Regulation Regload Vin = +3.3V, 0.1 ≤ I o ≤ 32A — ±10 — mV Vo Ripple/Noise pk-pk Vn Vin = +3.3V, Io = 32A — 50 — mV Transient Response Efficiency ttr Vos ttr Vos η Cout =680µF, Io =25% load step from 24A Vo over/undershoot Cout =2400µF, I o =50% load step from 16A Vo over/undershoot Vin = +3.3V, Io = 20A, V o = 1.8V — — — — — 100 200 100 200 90 — — — — — µs mV µs mV % Switching Frequency ƒo 3.1V ≤ Vin ≤ 3.6V 0.1A ≤ Io ≤ 32A 650 700 750 Absolute Maximum Operating Temperature Range Ta — Min 0 — +85 kHz (3) °C Storage Temperature Ts — -40 — +125 °C Weight — Vertical/Horizontal — 53/66 — grams Notes: (1) The ISR will operate down to no load with reduced specifications. (2) The minimum input voltage is 3.1V or Vout+1.2V, whichever is greater. (3) See Safe Operating Area curves for appropriate derating. Output Capacitors: The PT7772 series requires a minimum output capacitance of 680µF 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. For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT7772—3.3V 32 Amp “Sledge Hammer” Programmable ISR Features Programming Information Ordering Information • +3.3V input • 4-bit Programmable: 1.3V to 2.05V@32A • High Efficiency • Differential Remote Sense • Parallelable with PT7746 32A “Current Booster” VID3 VID2 VID1 VID0 PT7772❏ ❏ = 1.3 to 2.05 Volts 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 • 27-pin SIP Package 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 Vout 1.30V 1.35V 1.40V 1.45V 1.50V 1.55V 1.60V 1.65V 1.70V 1.75V 1.80V 1.85V 1.90V 1.95V 2.00V 2.05V For dimensions and PC board layout, see Package Style 1020 and 1030 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 may not be changed while the unit is operating. T Y P I C A L Characteristic Data, VIN =3.3V C H A R A C T E R I S T I C S (See Note A) Safe Operating Area, VIN =3.3V Efficiency vs Output Current Package Style N, Vout=+1.8V 90 70 VOUT 1.8V 1.5V 60 50 40 0 5 10 15 20 25 30 Ambient TTemperature emperature (°C) 90 80 Efficiency (%) (See Note B) 80 70 Airflow Nat. Conv 60 60 LFM 120 LFM 200 LFM 50 40 30 20 Output Current (A) 0 4 8 12 16 20 24 28 32 Output Current (A) Output Ripple vs Output Current 40 Ripple (mV) 30 VOUT 1.5V 1.8V 20 10 0 0 5 10 15 20 25 30 Output Current (A) Power Dissipation vs Output Current 20 PDiss (Watts) 15 VOUT 10 1.5V 1.8V 5 0 0 5 10 15 20 25 30 Output Current (A) Note A: All data listed 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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