PT7671 TI1 | Alldatasheet

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Technical content

Features

  • 5 V Input Voltage
  • 30 A Output Current
  • 5-bit Programmable Output: 1.3 V to 3.5 V
  • 93 % Efficiency
  • Differential Remote Sense
  • Over-Current Protection

Description

The PT7671 Excalibur™ high perfor- mance integrated switching regulator (ISR) is rated for up to 30 A. Housed in a 27-pin, space-saving, solderable cop- per package, the PT7671 delivers a higher output current than many mod- ules of similar size. This makes it an ideal choice where both a high output current and minimum board space are desirable. The PT7671 operates from a +5-V input bus and produces a tightly regulated output voltage that is pro- grammable over the range, 1.3 V to 3.5 V . The output voltage is selected via 5-bit input code, which is compatible with VRM specifications.

  • Over-T emperature Protection
  • 27-Pin Solderable Copper Case
  • 1.57 in² PCB Area (‘N’ Suffix)
  • IPC Lead-Free 2 Standard Application Cin = Required 1500 µF electrolytic Cout = Required 330 µF electrolytic L1 = Optional 1 µH input choke PT7671 4321 2 6 20–25 125 13–19 7–11 L O A D C OUT C IN PROGRAMMING PINS VIN VOUT GND SENSE(+) SENSE(–) STBY VID0 VID1 VID2 VID3 1 µH GND VID4

Ordering Information

PT7671/G6F = 1.3 to 3.5 VoltsThe PT7671 is most suitable for powering high-end DSP , ASIC, and microprocessor circuits that require core or I/O logic supply voltages as low as 1.3 V . Other features include output short- circuit and over-temperature protection, a standby control, and a differential remote sense to compensate for voltage drop between the regulator and load. The PT7671 is also pin compatible with the 20-A rated PT7711.

For technical support and more information, see inside back cover or visit www.ti.com *For STBY pin: open =output enabled ground =output disabled. Pin-Out Information Pin Function 1V I D 0 2V I D 1 3V I D 2 4V I D 3

5 STBY *

10 V in

11 V in

12 Sense(–)

13 GND

14 GND

15 GND

16 GND

17 GND

18 GND

19 GND

20 V out

21 V out

22 V out

23 V out

24 V out

25 V out

26 Sense(+)

27 Do not connect

PT7671— 5 V 30-A Programmable Integrated Switching Regulator Programming Information VID4=1 VID4=0 VID3 VID2 VID1 VID0 Vout Vout 1111 2.00 V 1.30 V 1110 2.10 V 1.35 V 1101 2.20 V 1.40 V 1100 2.30 V 1.45 V 1011 2.40 V 1.50 V 1010 2.50 V 1.55 V 1001 2.60 V 1.60 V 1000 2.70 V 1.65 V 0111 2.80 V 1.70 V 0110 2.90 V 1.75 V 0101 3.00 V 1.80 V 0100 3.10 V 1.85 V 0011 3.20 V 1.90 V 0010 3.30 V 1.95 V 0001 3.40 V 2.00 V 0000 3.50 V 2.05 V Logic 0 = Pin 12 potential (Rem Sense Gnd) Logic 1 = Open circuit (no pull-up resistors) VID 3 & VID4 must not be changed while the unit is operating. Pin Descriptions Vin: The positive input voltage power node to the mod- ule, which is referenced to common GND. GND: This is the common ground connection for the ‘Vin’ and ‘Vout’ power connections. It is also the 0 VDC reference for the ‘STBY’ control input. STBY: The STBY pin is an open-collector/drain nega- tive logic input that is referenced to GND. Applying a low-level ground signal to this input disables the module’s output and places the regulator in “standby” mode. When in standby, the input current drawn by the regulator is significantly reduced. If the STBY input is left open- circuit, the module will produce an output whenever a valid input source is applied. VID0–VID4: Selects the set-point output voltage of the regulator according to the applicable program code (See programming information). Each input, VID0 through VID4, is either connected to ‘Sense(–)’ or left open circuit. Vout: The regulated positive power output with respect to the GND node. The set point voltage at this node is defined by the status of the pins VID0 through VID4. Sense(+): Provides the regulator with the capability to regulate the set-point voltage at the load. When used with ‘Sense(–)’, the regulation circuitry will compensate for voltage drop between the converter and the load. This pin may be left open circuit, but connecting it to ‘Vout’ will improve load regulation. Sense(–): This is the logic ‘0’ reference for the inputs VID0 through VID4. It also provides the regulator with a differential remote sense capability when used with the ‘Sense(+)’ input. For optimum output voltage accuracy this pin should always be connected to GND. SLTS176A - NOVEMBER 2002 - REVISED JUNE 2003

For technical support and more information, see inside back cover or visit www.ti.com PT7671— 5 V 30-A Programmable Integrated Switching Regulator Specifications (Unless otherwise stated, T a =25 °C, Vin =5 V, Cin =1,500 µF, Cout =330 µF, Vo =3.3 V, and Io =Iomax) PT7671 Characteristics Symbols Conditions Min Typ Max Units Output Current I o Ta = 60 °C, 200LFM, pkg N 0 — 30 ATa = 25 °C, Natural convection 0 — 29 Input Voltage Range V in Over Io range 4.5 — 5.5 V Set-Point Voltage T olerance V o tol All output voltages — ±10 ±25 (1) mV T emperature Variation Reg temp –40 °C ≤Ta ≤+85 °C, Io =Iomin — ±1 — %V o Line Regulation Reg line Over Vin range — ±5 — mV Load Regulation Reg load Over Io range — ±5 — mV T otal Output Voltage Variation ∆Vo tol Includes set-point, line, load, — ±1.5 ±2.5 %V o–40 °C ≤Ta ≤+85 °C Efficiency η Io =15 A V o =3.3 V — 93 — Vo =2.5 V — 92 — % Vo =1.8 V — 89 — Io =30 A V o =3.3 V — 90 — Vo =2.5 V — 87 — % Vo =1.8 V — 83 — Vo Ripple (pk-pk) V r 20 MHz bandwidth — 40 — mV pp T ransient Response t tr 1 A/µs load step, 50 % and 100 % I omax — 25 — µSec Vos Vo over/undershoot — ±200 (2) —m V Over-Current Threshold I TRIP Reset followed by auto-recovery — 38 — A Switching Frequency ƒ s Over Vin range 250 300 350 kHz STBY* Input Requirements Input High Voltage V IH Referenced to GND 2.0 — Open (3) VInput Low Voltage V IL -0.2 — 0.8 Input Low Current I IL Pin 5 to GND — –0.3 — mA Standby Input Current I in standby Pin 5 to GND — 6 — mA External Capacitance C out 330 (4) — 15,000 µF Operating T emperature Range T a Over Vin Range –40 — 85 (5) °C Solder Reflow T emperature T reflow Surface temperature of module pins or case — — 215 (6) °C Storage T emperature T s — –40 — 125 °C Reliability MTBF Per Bellcore TR-332 3.4 — — 10 6 Hrs 50 % stress, Ta =40 °C, ground benign Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s1 msec, Half Sine, mounted to a fixture Mechanical Vibration — Mil-STD-883D, Method 2007.2 Suffixes A, N — 20 (7) — G’s20-2000 Hz Suffix C — 20 (7) — Weight — V ertical/Horizontal — 36 — grams Flammability — Materials meet UL 94V-0 Notes: (1) If the remote sense ground is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy. (2) The transient response may be improved by placing additional capacitors with low equivalent series resistance (ESR) on the o utput. (3) The STBY* control (pin 5) has an internal pull-up. If it is left open-circuit, the module will operate when input power is a pplied. A low-leakage (<1 µA) MOSFET must be used to control this pin. The open-circuit voltage may be as high as Vin. (4) For operation below 0 °C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors. (5) See safe Operating Area curves or consult factory for the appropriate derating. (6) During reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak o f 215 °C. For further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Products,” (SLTA051). (7) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable p ackage outline drawing. External Capacitors: The regulator require a minimum output capacitance of 330 µF for proper operation. An input capacitance of 1500 µF is also re quired. This must be rated for a minimum of 1.1 Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. F or further informa- tion refer to the application note regarding capacitor selection for this product. Input Filter: An input filter inductor is optional for most applications. The inductor must be sized to handle 30 ADC with a typical value of 1 µH. SLTS176A - NOVEMBER 2002 - REVISED JUNE 2003

For technical support and more information, see inside back cover or visit www.ti.com Performance Characteristics, Vin =5 V (See Note A) Safe Operating Area Curves (See Note B) Efficiency vs Output Current Ripple vs Output Current Power Dissipation vs Output Current PT7671, VIN =5 VDC, VOUT =3.3 V PT7671— 5 V 30-A Programmable Integrated Switching Regulator Typical Characteristics 0 5 10 15 20 25 30 Iout (A ) Ambient Temperature (°C) 400LFM 200LFM 60LFM Nat conv Airflow 0 5 10 15 20 25 30 Iout (A ) Ambient Temperature (°C) 400LFM 200LFM 60LFM Nat conv Airflow PT7671, VIN =5 VDC, VOUT =2.5 V 100 0 5 10 15 20 25 30 Iout (A ) Efficiency - % 3.3V 2.5V 1.8V VOUT 100 0 5 10 15 20 25 30 Iout (A ) Ripple - mV 3.3V 2.5V 1.8V VOUT 0 5 10 15 20 25 30 Iout (A ) Pd - Watts 3.3V 2.5V 1.8V VOUT Note A: All characteristic data in the above graphs has been developed from actual products tested at 25 °C. This data is considered t ypical for the ISR. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures. SLTS176A - NOVEMBER 2002 - REVISED JUNE 2003

For technical support and more information, see inside back cover or visit www.ti.com PT7670 Series sense pins disconnected will not damage the regulator. An internal 15 Ω resistor, connected between each sense pin and its corresponding output node, keeps the output voltage in regulation. If the remote sense feature is not used it is important to at least connect the Sense(–) pin to GND locally, as this provides a return path for the regulator’s internal bias currents. With the sense leads connected, the difference between the voltage measured between the V out and GND pins, and that measured between the Sense(+) and Sense(–) pins, is the amount of IR drop being compensated by the regulator. This should be limited to 0.6 V . (0.3 V maximum between pins 25 & 26, and also between pins 12 & 13). Note: The remote sense feature is not designed to compensate for the forward drop of non-linear or frequency dependent components that may be placed in series with the converter output. Examples include OR-ing diodes, filter inductors, ferrite beads, and fuses. When these components are enclosed by the remote sense connections they are effectively placed inside the regulation control loop, which can adversely affect the stability of the regulator. Over-Temperature Protection The PT7670 series of ISRs incorporates an on-board temperature sensor, which protects the module’s internal circuitry against excessively high temperatures. A rise in the temperature of the internal components may be the result of a drop in airflow, or a high ambient temperature. If the module’s internal temperature exceeds its OTP threshold (see data sheet specifications), the regulator output is disabled and the output voltage is reduced to zero. The re covery is automatic, and begins with a soft- start power up. It occurs when the the sensed temperature decreases by about 10 °C below the trip point. Note: The over-temperature protection is a last resort mecha- nism to prevent thermal stress to the regulator. Operation at or close to the thermal shutdown temperature is not r ecom- mended and will reduce the long-term reliability of the module. Always operate the regulator within the specified Safe Operating Area (SOA) limits for the worst-case conditions of ambient temperature and airflow. Over-Current Protection T o protect against load faults, the PT7670 series of regula- tors incorporates output over-current protection. Applying a load that exceeds the regulator’s over-current threshold (see data sheet specifications) will cause the regulated output to shut down. Following shutdown the ISR will periodically attempt to recover by initiating a soft-start power-up. This is often described as a “hiccup” mode of operation, whereby the module continues in the cycle of successive shutdown and power up until the load fault is removed. During this period, the average current flowing into the fault is significantly reduced. Once the fault is removed, the converter automatically recovers and returns to normal operation. Differential Remote Sense Connecting the Sense(+) and Sense(-) pins to the load circuit allows the regulator to compensate for limited amounts of ‘IR’ voltage drop. This voltage drop is caused by current flowing through the trace resistance between the power converter and the ‘point of regulation’ some distance away. Although not recommended, leaving the Operating Features and System Considerations for the PT7670 Series of ISRs Power up & Soft-Start Timing Following either the application of a valid input source voltage, or the removal of a ground signal to the STBY control pin (with input power applied), the regulator will initiate a soft-start power up. The soft start slows the rate at which the output voltage rises, and also introduces a short time delay of approx. 10ms. Figure 1-1 shows the power-up characteristic of a PT7671 with a 15-A load, and with the output voltage programmed to 3.3 V . Vo (2V/Div) Iin (10A/Div) Vin (2V/Div) HORIZ SCALE: 10ms/Div Figure 1-1

For technical support and more information, see inside back cover or visit www.ti.com Application Notes Table 2-1: Input/Output Capacitors Capacitor Recommendations for the PT7670 Series of 30-A Switching Regulators Input Capacitor: The recommended input capacitor is determined by a minimum of 1,500 µF of capacitance with a ripple cur- rent rating of 1.1 Arms. Ripple current and <100 m Ω equivalent series resistance (ESR) values are the major considerations, along with temperature, when designing with different types of capacitors. T antalum capacitors have a recommended minimum voltage rating of twice 2 × (the maximum DC voltage + AC ripple). This is necessary to insure reliability for input voltage bus applications. Output Capacitors: The ESR of the required capacitors is less than 100 m Ω . Electrolytic capacitors have marginal ripple performance at frequencies greater than 400 kHz but excellent low frequency transient response. Above the ripple frequency, ceramic capacitors are necessary to improve the transient response and reduce any high frequency noise components apparent during higher current excursions. Preferred low ESR type capacitor part numbers are identified in T able 2-1. PT7670 Series Tantalum Capacitors( Optional Output Capacitors) T antalum type capacitors can be used for the output but only the AVX TPS, Sprague 593D/594/595, or Kemet T495/T510 series. These capacitors are recommended over many other tantalum types due to their higher rated surge, power dissipation, and ripple current capability. As a caution the TAJ series by AVX is not recommended. This series has considerably higher ESR, reduced power dissipation, and lower ripple current capability. The TAJ series is also less reliable than the AVX TPS series when determining power dissipation capability. T antalum or Oscon® types are recommended for applications where ambient temperatures fall below 0 °C. Capacitor Table T able 2-1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple cur- rent (rms) ratings. The number of capacitors required at both the input and output buses is identified for each capacitor type. This is not an extensive capacitor list. Capacitors from other vendors are available with comparable specifications. Those listed are for guidance. The RMS ripple current rating and ESR (at 100 kHz) are critical parameters necessary to insure both optimum regulator performance and long capacitor life. /rodneVroticapaC seireS scitsiretcarahCroticapaCy titnauQ gnikroW egatloV )Fµ(eulaVt nelaviuqE)RSE( ecnatsiseRseireS elppiRmumixaM C°501@tnerruC )smrI( eziSlacisyhP )mm( tupnI suB tuptuO suB rebmuNrodneV )TMS(KFcinosanaP )laidaR(CF V52 V53 V61 V61 0022 033 074 0051 830.0 Ω 080.0 Ω 090.0 Ω 340.0 Ω Am0081 Am058 Am557 Am0961 61 × 5.61 01 × 2.01 01 × 5.21 61 × 51 M222E1KFVEE P133V1KFVEE 174C1CFUEE S251C1CFUEE noC-imehCdetinU ZXL XF V52 V61 V01 033 0051 086 090.0 Ω 830.0 Ω 510.0 Ω Am067 Am0661 Am5374 01 × 5.21 5.21 × 02 01 × 5.01 LL21X01M133BV52ZXL LL02X21M251BV61ZXL M086XF01 seireSLPnocihciN )TMS(XN V52 V01 V01 093 0051 033 080.0 Ω 050.0 Ω 420.0 Ω Am027 Am0331 Am0773 5.21 × 51 61 × 51 01 ×8 6HHM193E1LPU 6HHM251A1LPU SG1RCM133A1XNP )laidaR(PSnoc-sO )TMS(PVS V01 V01 074 033 510.0 Ω 710.0 Ω Am0154> Am0593> 01 × 5.01 9× 21 × 3.8 M074PS01 M033PVS01 mulatanaTXVA seireS-SPT V01 V01 033 033 01.0 Ω 60.0 Ω Am4141 Am6281 L3.7 × W3.4 × H1.4 0010R010M733VSPT 0600R010M733VSPT mulatnaTeugarpS D495/D595 V01 V01 033 086 40.0 ÷5 110.0=4 Ω 90.0 Ω Am0054> Am0151> L3.7 × W7.5 × H0.4 T2R0100X733D495 T2R0100X786D595 mulatnaTtemeK )TMS(594T/015T V01 V01 033 022 530.0 Ω 0.0 ÷7 530.0=2 Ω Am0002 Am0002> W3.4 × L3.7 × H0.4 SA010M733X015 SA010M722X594T pacsoPoynaS )TMS(BPT V010 224 0.0 Ω Am0003L 2.7 × W3.4 × H1.3

62 M 022BPT01

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