PT7775—5V 32 Amp 0.8V to 3.1V Programmable Integrated Switching Regulator SLTS114 (Revised 8/31/2000) Description The PT7775 is a high-output, 32A Integrated Switching Regulator (ISR), housed in a 27-pin SIP package. The PT7775 is a low voltage version of the PT7779, a next generation “Sledge Hammer” ISR. These regulators include short circuit protection and require only 330µF of output capacitance. The low-output voltage and 32A load capability makes the PT7775 an ideal source for powering the industry’s latest high-speed, low-voltage µPs, ASICs, and DSPs from an existing 5V source. The output voltage is programmable from 0.8V to 3.1V, via a 5-bit input. The PT7775 will operate with up to two PT7741 32A current boosters. A differential remote sense provides compensation for voltage drop between the ISR and load. Pin-Out Information Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 VID4 REMOTE SENSE (+) 6 4 3 2 1 26 SNS(+) VID4 - VID0 V IN L1 7-11 PT7775 Vin 1uH + SYNC OUT C IN STBY Synch Out 5 27 Vo GND SNS(-) 13-19 V OUT 20-25 + 12 LOAD C OUT GND GND 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 REMOTE SENSE (–) STBY* C in = Required 2400µF electrolytic Cout = Required 330µF electrolytic L1 = Optional 1µH input choke Specifications For STBY* pin; open = output enabled; ground = output disabled. PT7775 Characteristics (T a = 25°C unless noted) Symbols Conditions Min Output Current Io Ta = +60°C, 200 LFM, pkg N Ta = +25°C, natural convection 0.1 0.1 Input Voltage Range Vin 0.1A ≤ I o ≤ 32A Output Voltage Tolerance ∆Vo Line Regulation Load Regulation Vo Ripple/Noise pk-pk Transient Response with Cout = 330µF Efficiency Switching Frequency Absolute Maximum Operating Temperature Range Storage Temperature Typ Max Units — — 32 31 A 4.5 — 5.5 V Vin = +5V, Io = 32A –40°C ≤ Ta ≤ +85°C Vo-0.03 — Vo+0.03 V Regline 4.5V ≤ V in ≤ 5.5V, I o = 32A — ±10 — mV Regload Vin = +5V, 0.1 ≤ Io ≤ 32A — ±10 — mV Vn Vin = +5V, Io = 32A — 50 — mV ttr Vos Io step between 16A and 32A Vo over/undershoot — — 100 200 — — µSec mV η Vin = +5V, Io = 20A, V o = 3.3V — 90 — % ƒo 4.5V ≤ V in ≤ 5.5V 0.1A ≤ I o ≤ 32A 300 350 400 kHz Ta Over V in Range –40 — +85 Ts — -40 — +125 °C Per Mil-STD-883D, Method 2007.2, 20-20,000Hz, Soldered in a PC board — 10/15 — G’s Vertical/Horizontal — 53/66 — grams Mechanical Vibration Weight 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 — (1) (1) (2) °C Notes: (1) ISR-will operate down to no load with reduced specifications. (2) See SOA curves or consult 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 PT7775 requires a minimum output capacitance of 330µF (ESR ≤ 0.1Ω) for proper operation. The PT7775 also requires an input capacitance of 2400µF, which must be rated for a minimum of 2.0Arms ripple current. For transient or dynamic load applications, additional capacitance may be required. For further information, see the accompanying capacitor application note for this product. Input Filter: An input filter choke is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1µH. For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT7775—5V 32 Amp 0.8V to 3.1V Programmable Integrated Switching Regulator Programming Information Features • +5V input • 32A Output (64A with PT7741) • 5-bit Programmable: 0.8V to 3.1V • 90% Efficiency • Short Circuit Protection • Differential Remote Sense • 27-pin SIP Package • Compatible with PT7741 “Current Booster” 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 PT7775o = 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. T Y P I C A L Performance Characteristics, VIN =5.0V C H A R A C T E R I S T I C S Safe Operating Area, VIN =5.0V (See Note A) Efficiency vs Output Current PT7775, VO =1.8V/1.5V 90 90 80 Efficiency - % VOUT 80 2.5V 1.8V 1.2V 75 70 Ambient Temperature (°C) 95 85 65 Airflow 70 400LFM 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 60 0 4 8 12 16 20 24 28 0 32 4 8 12 Iout (A) 16 20 24 28 32 Iout (A) PT7775, VO =1.2V Output Ripple vs Output Current 90 60 VOUT 40 2.5V 1.8V 1.2V 30 20 10 Ambient Temperature (°C) 80 50 Ripple - mV (See Note B) Airflow 70 400LFM 200LFM 120LFM 60LFM Nat conv 60 50 40 30 0 20 0 4 8 12 16 20 24 28 0 32 5 10 15 20 25 30 Iout (A) Iout (A) Power Dissipation vs Output Current 16 14 Pd - Watts 12 VOUT 10 2.5V 1.8V 1.2V 8 6 4 2 0 0 4 8 12 16 20 24 28 32 Iout (A) Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the regulator. Note B: Safe Operating Area curves represent conditions at which internal components are at or below manufacturer’s maximum operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes PT77775, PT7778, PT7779 Capacitor Recommendations for the PT7775/8/9 Regulators and PT7740/1 Current Boosters Input Capacitors The recommended input capacitance is determined by 2.0 ampere minimum ripple current rating and 1500µF minimum capacitance. Capacitors listed below must be rated for a minimum of 2x the input voltage with +5V operation. Ripple current and ≤100mΩ Equivalent Series Resistance (ESR) values are the major considerations along with temperature when selecting the proper capacitor. Output Capacitors The minimum required output capacitance is 330µF with a maximum ESR less than or equal to 100mΩ. Failure to observe this requirement may lead to regulator instability or oscillation. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz, but excellent low frequency transient response. Above the ripple frequency ceramic decoupling capacitors are necessary to improve the transient response and reduce any microprocessor high frequency noise components apparent during higher current excursions. Preferred low ESR type capacitor part numbers are identified in the Table 1 below. Tantalum Characteristics Tantalum capacitors with a minimum 10V rating are recommended on the output bus, but only the AVX TPS Series, Sprague 594/595 Series, or Kemet T495/T510 Series. The AVX TPS Series, Sprague Series or Kemet Series capacitors are specified over other types due to their higher surge current, excellent power dissipation and ripple current ratings. As an example, the TAJ Series by AVX is not recommended. This series exhibits considerably higher ESR, reduced power dissipation and lower ripple current capability. The TAJ Series is a less reliable compared to the TPS series when determining power dissipation capability. Capacitor Table Table 1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The suggested minimum quantities per regulator for both the input and output buses are identified. This is not an extensive capacitor list. The table below is a selection guide for input and output capacitors. Other capacitor vendors are available with comparable RMS ripple current rating and ESR (Equivalent Series Resistance at 100kHz). These critical parameters are necessary to insure both optimum regulator performance and long capacitor life. Table 1 Capacitors Characteristic Data Capac i t or Ve n d o r / Ser i es Capac i t or Char ac t e r i s t i c s Qu a n t i t y Working Voltage Value(µF) ( ESR) Equi v al e nt Se r i e s Re s i s t anc e 1 0 5 ° C Ma x i m u m Ri ppl e C u r r e n t ( I r ms ) Phy s i c al S i z e ( mm) I nput Bu s Ou t p u t Bu s Panasonic FC Surface Mtg 16V 35V 3300 330 0.028Ω 0.065Ω 2490mA 1205mA 18x21.5 12.5x16.5 1 1 1 EEVFC1C333N EEVFC1V331LQ FA Radial 10V 16V 680 1200 0.090Ω 0.038Ω 755mA 1690mA 10x12.5 16x15 1 1 EEUFA1A681 EEUFA1C122S United Chemi -Con LFVSeries 25V 16V 16V 330 2200 470 0.084Ω 0.038Ω 0.084Ω 825mA 1630mA 825mA 10x16 16x20 10x16 2 1 1 1 LXV25VB331M10X16LL LXV16VB222M16X20LL LXV16VB471M10X16LL Nichicon PL Series PM Series 10V 10V 25V 680 2700 330 0.085Ω 0.035Ω 0.095Ω 795mA 1740mA 750mA 10x15 16x20 10x15 2 1 1 1 UPL1A681MPH6 UPL1A272MHH6 UPL1E331MPH6 Oscon SS SV 10V 10V 330 330 0.025Ω/7=0.006Ω 0.020Ω/7=0.005Ω >9800mA >9800mA 10x10.5 10.3x12.6 7 7 N/R (Note) AVX Tanatalum TPS- Series 10V 10V 330 330 0.100/7=15Ω 0.060/7Ω 3500mA 1826mA 7.3Lx 4.3Wx 4.1H 7 7 1 1 TPSV337M010R0100 TPSV337M010R0060 Sprague Tantalum 595D/594D 10V 330 0.045W/7=0.011Ω >4500mA 1 680 0.090Ω/4 >1660mA 7.3L x 5.7W x 4.0H 7 10V 4 1 594D337X0010R2T Surface Mount 595D687X0010R2T Kemet Tantalum T510/T495 Series 10V 330 0.035Ω/5=0.007Ω 2000mA 10V 220 0.070Ω/2=0.035Ω >2000mA Sanyo Poscap TPB 10V 220 0.040Ω 3000mA 4.3Wx7.3L x4.0H 2 7 7.2L x 4.3W x 3.1H Note: (N/R) is not recommended for this application, extremely low Equivalent Series Resistance (ESR) For technical support and more information, see inside back cover or visit www.ti.com/powertrends Vendor Number 10SS330M 10SV330M(Sufvace Mtg 1 T510X337M010AS 2 T495X227M010AS Surface Mount 2 10TPB220M Surface Mount IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 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