For assistance or to order, call Application Notes Mechanical Outline Product Selector Guide (800) 531-5782 PT7705 Series 18 AMP “BIG-HAMMER” PROGRAMMABLE INTEGRATED SWITCHING REGULATOR The PT7705 is a new series of high-performance, 18 Amp Integrated Switching Regulators (ISRs) housed in a 27-pin SIP package. The 18A capability allows easy integration of the latest high-speed, low-voltage µPs and bus drivers into existing 5V systems. The PT7705 series has been designed to work in parallel with one or more of the PT7749 - 18A current boosters for increased Iout in incre- Revised 5/15/98 ments of 18A. The output voltage of the PT7705 can be easily programmed from 1.3V to 3.5V with a 5 bit input compatible with Intel’s Pentium II Processor. A differential remote sense is also provided which automatically compensates for any voltage drop from the ISR to the load. 1200µF of output capacitance are required for proper operation. Pin-Out Information Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 VID4 REMOTE SENSE (+) 6 4 3 2 1 L1 VIN CIN + 26 PT7705 7 - 11 1µH 27 13 - 19 5 VOUT 20 - 25 12 COUT + LOAD SYNC OUT GND GND STBY* REMOTE SENSE (-) Cin = Required 1200µF electrolytic Cout= Required 1200µF electrolytic L1 = Optional 1µH input choke Pin Function Pin Function Pin Function 1 VID0 10 Vin 19 GND 2 3 VID1 VID2 11 12 Vin Remote Sense Gnd 20 21 Vout Vout 4 5 VID3 STBY* - Stand-by 13 14 GND GND 22 23 Vout Vout 6 7 VID4 Vin 15 16 GND GND 24 25 Vout Vout 8 9 Vin Vin 17 18 GND GND 26 27 Sync Out Remote Sense Vout For STBY* pin; open = output enabled; ground = output disabled. Specifications PT7705 SERIES Characteristics (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current Io Ta = +60°C, 200 LFM, pkg N Ta = +25°C, natural convection 0.1 * 0.1 * — — 18 ** 15 ** A A Input Voltage Range Vin 0.1A ≤ Io ≤ 15A 4.5 *** — 5.5 V Output Voltage Tolerance ∆Vo Vin = +5V, Io = 15A 0°C ≤ Ta ≤ +65°C Vo-0.03 — Vo+0.03 V Line Regulation Regline 4.5V ≤ Vin ≤ 5.5V, Io = 15A — ±10 — mV Load Regulation Regload Vin = +5V, 0.1 ≤ Io ≤ 15A — ±10 — mV Vo Ripple/Noise Vn Vin = +5V, I o = 15A — 50 — mV Transient Response with Cout = 1200µF ttr Vos Io step between 7.5A and 15A Vo over/undershoot — — 100 200 — — µSec mV Efficiency η Vin = +5V, Io = 10A — — — — — 89 87 85 79 77 — — — — — % % % % % Switching Frequency ƒo 4.5V ≤ V in ≤ 5.5V 0.1A ≤ Io ≤ 15A 650 700 750 kHz Absolute Maximum Operating Temperature Range Ta — 0 — +85 °C Recommended Operating Temperature Range Ta Forced Air Flow = 200 LFM Over Vin and Io Ranges 0 — +65**** °C Storage Temperature Ts Vo Vo Vo Vo Vo = 3.3V = 2.9V = 2.5V = 1.8V = 1.5V — -40 — +125 °C Mechanical Shock Per Mil-STD-883D, Method 2002.3 1 msec, Half Sine, mounted to a fixture — 500 — G’s Mechanical Vibration Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, Soldered in a PC board — 10 — G’s Vertical/Horizontal — 31/41 — grams Weight — * ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected. **The PT7705 series can be easily paralleled with one or more of the PT7749 Current Boosters to provide increased output current in increments of 18A. *** The minimum input voltage is 4.5V or Vout+1.2V, whichever is greater. ****See SOA curves. Output Capacitors: The PT7705 series requires a minimum ouput capacitance of 1200µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance is 15,000µF. See Capacitor Application Note. Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 15ADC with a typical value of 1µH. The input capacitance must be rated for a minimum of 1.3Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. 38 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com Features For assistance or to order, call (800) 531-5782 PT7705 Series Ordering Information Programming Information VID3 VID2 VID1 VID0 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 2.0V 2.1V 2.2V 2.3V 2.4V 2.5V 2.6V 2.7V 2.8V 2.9V 3.0V 3.1V 3.2V 3.3V 3.4V 3.5V (For dimensions and PC board layout, see Package Styles 800 and 810.) 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 PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount N A C 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. C H A R A C T E R I S T I C PT7705, Vo = 3.3 VDC D A T A PT7705, Vo = 3.3 VDC (See Note 1) Safe Operating Area Curves (@Vin=+5V) (See Note 1) Efficiency vs Output Current 100 PKG SUFFIX N Ambient Temperature (°C) 80 70 Airflow Recommended Maximum Operating Temperature 60 Efficiency - % 90 90 80 Vin 4.5V 70 5.0V Nat Conv 5.5V 60 60LFM 100LFM 50 50 200LFM 40 40 0 30 3 6 9 12 15 18 Iout-(Amps) 20 0 2 4 6 8 10 12 14 16 18 Ripple vs Output Current Output Current (Amps) 60 PKG SUFFIX A, C 50 Vin 40 80 70 Airflow Recommended Maximum Operating Temperature 60 Nat Conv Ripple-(mV) Ambient Temperature (°C) 90 5.5V 30 5.0V 4.5V 20 60LFM 100LFM 50 10 200LFM 40 0 0 3 30 6 9 12 15 18 Iout-(Amps) 20 0 2 4 6 8 10 12 14 16 18 Power Dissipation vs Output Current Output Current (Amps) 14 PD-(Watts) 12 10 Vin 5.5V 8 5.0V 4.5V 6 4 2 0 0 3 6 9 12 15 18 Iout-(Amps) Note 1: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note 2: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures. Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http:// www.powertrends.com 39 DATA SHEETS 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 PT7705❏ ❏ = 1.3 to 3.5 Volts 5V5V to Bus 3.x Converters Products • Single-Device: +5V input • 5-bit Programmable: 1.3V to 3.5V@18A • High Efficiency • Input Voltage Range: 4.5V to 5.5V • Differential Remote Sense • 27-pin SIP Package • Parallelable with PT7749 18A “Current Boosters” VID4=1 VID4=0 Vout Vout For assistance or to order, call Application Notes (800) 531-5782 PT7705/7707 Series More Application Notes Pin-Coded Output Voltage Adjustment on the “Big Hammer” Series ISRs 4. If active devices are used to ground the voltage control pins, low-level open drain MOSFET devices should be used over bipolar transistors. The inherent Vce (sat) in bipolar devices introduces errors in the device’s internal divider network. Discrete transistors such as the BSS138, 2N7002, IRLML2402, or the 74C906 hex open-drain buffer are examples of appropriate devices. The ISRs related to Power Trends’ PT7705 incorporate pincoded voltage control to adjust the ouput voltage. The control pins are identified VID0 - VID4 (pins 1, 2, 3, 4, & 6) respectively. When the control pins are left open-circuit, the ISR output will regulate at its factory trimmed output voltage. Each pin is internally connected to a precision resistor, which when grounded changes the output voltage by a set amount. By selectively grounding VID0 -VID4, the output voltage these ISRs can be programmed in incremental steps over the specified output voltage range. In each case, the program code and output voltage range offered by these ISRs are compatible with the voltage ID specification defined by Intel Corporation for voltage regulator modules (VRMs) used to power Pentium® microprocessors. Refer to Figure 1 below for the connection schematic, and the respective device Data Sheet for the appropriate programming code information. Active Voltage Programming: Special precautions should be taken when making changes to the voltage control progam code while the unit is powered. It is highly recommended that the ISR be either powered down or held in standby. Changes made to the program code while Vout is enabled induces high current transients through the device. This is the result of the electrolytic output capacitors being either charged or discharged to the new output voltage set-point. The transient current can be minimized by making only incremental changes to the binary code, i.e. one LSB at a time. A minimum of 100µs settling time between each program state is also recommended. Making non-incremental changes to VID3 and VID4 with the output enabled is discouraged. If they are changed, the transients induced can overstress the device resulting in a permanent drop in efficiency. If the use of active devices prevents the program code being asserted prior to power-up, pull pin 5 (STBY) to the device GND during the period that the input voltage is applied to Vin. Releasing pin 5 will then allow the device output to execute a soft-start power-up to the programmed voltage. Notes: 1. The programming convention is as follows:Logic 0: Logic 1: Connect to pin12 (Remote Sense Ground). Open circuit/open drain (See notes 2, & 4) 2. Do not connect pull-up resistors to the voltage programming pins. 3. To minimize output voltage error, always use pin 12 (Remote Sense Ground) as the logic “0” reference. While the regular ground (pins 13-19) can also be used for programming, doing so will degrade the load reglation of the product. Figure 1 6 4 3 2 1 26 VID4 - VID0 +5V 7-11 1µ H (Optional) SNS(+) PT7705 Vin STBY 5 Synch Out 27 GND 13-19 20-25 Vo SNS(-) 12 + Cin + Cout L O A D STBY COM Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com 3 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. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. 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