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| For assistance or to order, call (800) 531-5782 PT7707 Series 18 AMP "BIG-HAMMER" PROGRAMMABLE INTEGRATED SWITCHING REGULATOR The PT7707 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 Ps and bus drivers into existing 5V systems. The PT7707 series has been designed to work in parallel with one or more of the PT7749 - 18A current boosters for increased Iout in incre- Revised 7/24/98 ments of 18A. The output voltage of the PT7707 can be easily programmed from 1.3V to 3.5V with a 5 bit input compatible with Intel's Pentium(R) II Processor. A differential remote sense is also provided which automatically compensates for any voltage drop from the ISR to the load. Only 330F of output capacitance are required for proper operation. Pin-Out Information Pin Function Pin Function 10 11 12 13 14 15 16 17 18 Vin Vin Remote Sense Gnd Pin Function 19 20 21 22 23 24 25 26 27 GND Vout Vout Vout Vout Vout Vout Remote Sense Vout Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 VID4 REMOTE SENSE (+) 6432 1 26 1 2 3 VOUT VID0 VID1 VID2 VID3 STBY* - Stand-by VIN L1 7 - 11 1H + 27 PT7707 PT7705 13 - 19 5 12 20 - 25 4 5 LOAD GND GND GND GND GND GND CIN SYNC OUT GND STBY* C OUT + GND REMOTE SENSE (-) 6 7 8 9 VID4 Vin Vin Vin Cin = Required 1200F electrolytic Cout= Required 330F electrolytic L1 = Optional 1H input choke Sync Out For STBY* pin; open = output enabled; ground = output disabled. Specifications Characteristics (Ta = 25C unless noted) Output Current Input Voltage Range Output Voltage Tolerance Line Regulation Load Regulation Vo Ripple/Noise Transient Response with Cout = 330F Efficiency PT7707 SERIES Symbols Io Vin Vo Regline Regload Vn ttr Vos Conditions Ta = +60C, 200 LFM, pkg N Ta = +25C, natural convection 0.1A Io 15A Vin = +5V, Io = 15A 0C Ta +65C 4.5V Vin 5.5V, Io = 15A Vin = +5V, 0.1 Io 15A Vin = +5V, I o = 15A Io step between 7.5A and 15A Vo over/undershoot Vin = +5V, Io = 10A Vo Vo Vo Vo Vo = 3.3V = 2.9V = 2.5V = 1.8V = 1.5V Min 0.1 * 0.1 * 4.5 *** Vo-0.03 -- -- -- -- -- -- -- -- -- -- 650 0 0 -40 -- -- -- Typ -- -- -- -- 10 10 50 100 200 89 87 85 79 77 700 -- -- -- 500 10 31/41 Max 18 ** 15 ** 5.5 Vo+0.03 -- -- -- -- -- -- -- -- -- -- 750 +85 +65**** +125 -- -- -- Units A A V V mV mV mV Sec mV % % % % % kHz C C C G's G's grams Switching Frequency Absolute Maximum Operating Temperature Range Recommended Operating Temperature Range Storage Temperature Mechanical Shock Mechanical Vibration Weight o Ta Ta Ts 4.5V V in 5.5V 0.1A Io 15A -- Forced Air Flow = 200 LFM Over Vin and Io Ranges -- Per Mil-STD-883D, Method 2002.3 1 msec, Half Sine, mounted to a fixture Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, Soldered in a PC board -- Vertical/Horizontal * ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected. **The PT7707 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 PT7707 series requires a minimum ouput capacitance of 330F for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance is 15,000F. Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 18ADC with a typical value of 1H. 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. Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com For assistance or to order, call (800) 531-5782 PT7707 Features * 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" Series Programming Information 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 PT7707t = 1.3 to 3.5 Volts t (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 VID4=1 VID4=0 Vout Vout 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 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. CHARACTERISTIC PT7707, Vo = 3.3 VDC (See Note 1) DATA (See Note 1) PT7707, Vo = 3.3 VDC Efficiency vs Output Current 100 Safe Operating Area Curves (@Vin=+5V) PKG SUFFIX N Ambient Temperature (C) Efficiency - % 90 80 70 60 50 40 30 20 0 2 4 6 8 10 12 14 16 18 90 80 Vin 4.5V 5.0V Recommended Maximum Operating Temperature Airflow Nat Conv 60LFM 100LFM 200LFM 70 60 5.5V 50 40 0 3 6 9 12 15 18 Iout-(Amps) Output Current (Amps) 60 Ripple vs Output Current PKG SUFFIX A, C 90 50 40 Vin 5.5V Ambient Temperature (C) 80 70 60 50 40 30 20 0 2 4 6 8 10 12 14 16 18 Ripple-(mV) 30 5.0V 4.5V Recommended Maximum Operating Temperature Airflow Nat Conv 60LFM 100LFM 200LFM 20 10 0 0 3 6 9 12 15 18 Iout-(Amps) Power Dissipation vs Output Current Output Current (Amps) 14 12 PD-(Watts) 10 8 6 4 2 0 0 3 6 9 12 15 18 Vin 5.5V 5.0V 4.5V Iout-(Amps) Note 1: All data listed in the above graphs has been developed from actual products tested at 25C. 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 For assistance or to order, call (800) 531-5782 Application Notes PT7705/7707 Series More Application Notes Pin-Coded Output Voltage Adjustment on the "Big Hammer" Series ISRs 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(R) microprocessors. Refer to Figure 1 below for the connection schematic, and the respective device Data Sheet for the appropriate programming code information. 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) 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. 2. Do not connect pull-up resistors to the voltage programming pins. 3. T minimize output voltage error, always use pin 12 (Reo mote 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 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 100s 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. 64321 VID4 - VID0 7-11 26 SNS(+) 20-25 Vo +5V 1H (Optional) Vin PT7705 Synch Out 27 GND 13-19 5 STBY 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. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 1999, Texas Instruments Incorporated |
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