PT7707 TI | Alldatasheet

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Technical content

For STBY* pin; open = output enabled; ground = output disabled. Pin-Out Information Pin Function

1 VID0

2 VID1

3 VID2

4 VID3

5 STBY* - Stand-by

6 VID4

10 V in

11 V in

12 Remote Sense Gnd

13 GND

14 GND

15 GND

16 GND

17 GND

18 GND

The PT7707 is a new series of high-performance, 18 Amp Integrated Switching Regulators (ISRs) housed in a 27-pin SIP package. The 18A capa- bility allows easy integration of the latest high-speed, low-voltage µPs and bus drivers into existing 5V systems. The PT7707 series has been de- signed to work in parallel with one or more of the PT7749 - 18A current boosters for increased I out in incre- 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 Pentiumâ II Processor. A differential remote sense is also pro- vided which automatically compensates for any voltage drop from the ISR to the load. Only 330µF of output capacitance are required for proper operation. For assistance or to order, call (800) 531-5782 Cin = Required 1200µF electrolytic Cout= Required 330µF electrolytic L1 = Optional 1µH input choke Pin Function

19 GND

20 V out

21 V out

22 V out

23 V out

24 V out

25 V out

26 Remote Sense Vout

27 Sync Out

Characteristics PT7707 SERIES (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current I o Ta = +60°C, 200 LFM, pkg N 0.1 * —1 8 ** A Ta = +25°C, natural convection 0.1 * —1 5 A Input Voltage Range V in 0.1A £ Io £ 15A 4.5 * — 5.5 V Output Voltage T olerance D Vo Vin = +5V , Io = 15A Vo-0.03 — V o+0.03 V0°C £ Ta £ +65°C Line Regulation Reg line 4.5V £ Vin £ 5.5V , Io = 15A — ±10 — mV Load Regulation Reg load Vin = +5V , 0.1 £ Io £ 15A — ±10 — mV Vo Ripple/Noise V n Vin = +5V , Io = 15A — 50 — mV T ransient Response t tr Io step between 7.5A and 15A — 100 — µSec with Cout = 330µF V os Vo over/undershoot — 200 — mV Efficiency h Vin = +5V , Io = 10A V o = 3.3V — 89 — % Switching Frequency ƒ o 4.5V £ Vin £ 5.5V 650 700 750 kHz0.1A £ Io £ 15A Absolute Maximum T a —0 — + 8 5 ° C Operating T emperature Range Recommended Operating T a Forced Air Flow = 200 LFM 0 — +65**** °CT emperature Range Over V in and Io Ranges Storage T emperature T s — -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, —1 0—G ’ s20-2000 Hz, Soldered in a PC board Weight — Vertical/Horizontal — 31/41 — grams * 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 330µF for proper operation. Do not use Oscon type capacitors. The max imum allow- able output capacitance is 15,000µF . Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 18ADC 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. Revised 7/24/98 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com PT7705 7 - 11 13 - 19 20 - 25 VIN GND 1µH GND VOUT C OUT +C IN + 12 261 SYNC OUT LOAD REMOTE SENSE (+) REMOTE SENSE (-) VID1 VID2 VID3 VID4 PROGRAMMING PINS 234 STBY* VID0 PT7707

18 AMP “BIG-HAMMER” PROGRAMMABLE

INTEGRATED SWITCHING REGULATOR Series

VID4=1 VID4=0 VID3 VID2 VID1 VID0 Vout Vout 1 1 1 1 2.0V 1.30V 1 1 1 0 2.1V 1.35V 1 1 0 1 2.2V 1.40V 1 1 0 0 2.3V 1.45V 1 0 1 1 2.4V 1.50V 1 0 1 0 2.5V 1.55V 1 0 0 1 2.6V 1.60V 1 0 0 0 2.7V 1.65V 0 1 1 1 2.8V 1.70V 0 1 1 0 2.9V 1.75V 0 1 0 1 3.0V 1.80V 0 1 0 0 3.1V 1.85V 0 0 1 1 3.2V 1.90V 0 0 1 0 3.3V 1.95V 0 0 0 1 3.4V 2.00V 0 0 0 0 3.5V 2.05V

  • 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”

Features

For assistance or to order, call (800) 531-5782 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http:/www.powertrends.com PT7707, Vo = 3.3 VDC (See Note 1) Efficiency vs Output Current Ripple vs Output Current Power Dissipation vs Output Current Efficiency - %Ripple-(mV)PD-(Watts) Iout-(Amps) Iout-(Amps) Iout-(Amps) Note 1:Note 1:Note 1:Note 1: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. Safe Operating Area Curves (@Vin=+5V) Ambient Temperature (°C) Output Current (Amps) Airflow Airflow Ambient Temperature (°C) Output Current (Amps) PKG SUFFIX N Note 2:Note 2:Note 2:Note 2:Note 2: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating t emperatures. Recommended Maximum Operating Temperature 0 3 6 9 1 21 51 8 5.5V 5.0V 4.5V Vin 100 0 3 6 9 12 15 18 4.5V 5.0V 5.5V Vin 0 3 6 9 12 15 18 5.5V 5.0V 4.5V Vin Series

Ordering Information

PT7707ooooo = 1.3 to 3.5 Volts (For dimensions and PC board layout, see Package Styles 800 and 810.) Recommended Maximum Operating Temperature PT7707, Vo = 3.3 VDC (See Note 1) PKG SUFFIX A, C PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole N Horizontal Through-Hole A Horizontal Surface Mount C 02468 1 0 1 2 1 4 1 6 1 8 Nat Conv 60LFM 100LFM 200LFM 02468 1 0 1 2 1 4 1 6 1 8 Nat Conv 60LFM 100LFM 200LFM 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 PT7707

For assistance or to order, call (800) 531-5782 3Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com More Application Notes Pin-Coded Output Voltage Adjustment on the “Big Hammer” Series ISRs The ISRs related to Power Trends’ PT7705 incorporate pin- coded voltage control to adjust the ouput voltage. The control pins are identified VID0 - VID4 (pins 1, 2, 3, 4, & 6) respec- tively. 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 selec- tively 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® micropro- cessors. Refer to Figure 1 below for the connection schematic, and the respective device Data Sheet for the appropriate pro- gramming code information. Notes: 1. The programming convention is as follows:- Logic 0: Connect to pin12 (Remote Sense Ground). Logic 1: Open circuit/open drain (See notes 2, & 4) 2. Do not connect pull-up resistors to the voltage program- ming pins. 3. To minimize output voltage error, always use pin 12 (Re- mote Sense Ground) as the logic “0” reference. While the regular ground (pins 13-19) can also be used for program- ming, doing so will degrade the load reglation of the product. Figure 1 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 V ce(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. 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 V out is enabled induces high current transients through the device. This is the result of the electrolytic output capacitors being ei- ther charged or discharged to the new output voltage set-point. The transient current can be minimized by making only incre- mental 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 result- ing 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 V in. Releasing pin 5 will then allow the device output to execute a soft-start power-up to the pro- grammed voltage. Cout Cin 1 µ H (Optional) +5V COM STBY L O A D PT7705 6 4 3 2 1 26 20-25 125 13-1927 7-11 VoVin GND SNS(+) SNS(-) Synch OutSTBY VID4 - VID0

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