PT7681 TI | Alldatasheet

Document overview

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Technical content

Features

  • 5V Input Voltage
  • 30A Output Current
  • 4-bit Programmable Output: 2V to 3.5V
  • 95% Efficiency
  • Margin Up/Down Controls
  • Differential Remote Sense

Description

The PT7681 Excalibur™ is a high performance integrated switching regu- lator (ISR), which is housed in a 27-pin space-saving solderable copper pack- age. Operating from a +5V input source, the PT7681 delivers up to 30A of out- put current over the adjustable output voltage range of 2V to 3.5V. The high output current and relatively small size makes the PT7681 suitable for power- ing high-end DSP, microprocessor, and ASIC circuits requiring core or I/O logic supply voltages as low as 2V. The output voltage is programmable via a 4-bit input code.

  • Over-Current Protection
  • Over-Temperature Protection
  • 27-Pin Solderable Copper Case
  • 1.57in² PCB Area (‘N’ Suffix)
  • IPC Lead-Free 2 Standard Application Cin = Required 1500µF electrolytic Cout = Required 330µF electrolytic L1 = Optional 1µH input choke PT7681 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 1µH GND 276 MARGUP MARGDN

Ordering Information

PT7681/G6F = 2 to 3.5 VoltsA special feature of the PT7681 is the Margin Up and Margin Down controls. These controls provide a convenient method for testing the load circuit over its supply voltage margins during production and quali- fication test programs. Other features include output short- circuit and over-temperature protection, a standby on/off control, and a differ- ential remote sense to compensate for voltage drop between the regulator and load.

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 *

6 MARGDN

10 Vin

11 Vin

12 Sense(–)

13 GND

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 Sense(+)

27 MARGUP

PT7681— 5V Programming Information VID3 VID2 VID1 VID0 Vout 1111 2.00V 1110 2.10V 1101 2.20V 1100 2.30V 1011 2.40V 1010 2.50V 1001 2.60V 1000 2.70V 0111 2.80V 0110 2.90V 0101 3.00V 0100 3.10V 0011 3.20V 0010 3.30V 0001 3.40V 0000 3.50V Logic 0 = Pin 12 potential (Rem Sense Gnd) Logic 1 = Open circuit (no pull-up resistors) VID 3 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 0VDC 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 ground signal to this input will disable the module’s output and place the regulator in “standby” m ode. When in standby, the input current drawn by the regula- tor is significantly reduced. If the STBY input is left open circuit, the module will produce an output when- ever a valid input source is applied. VID0–VID3: Selects the set-point output voltage of the regulator according to the applicable program code (See programming information). Each input, VID0 through VID3, must either be 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 VID3. 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 VID3. 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. MARGDN: This is an open-collector/drain negative logic input. Applying a ground signal to this input increases the output voltage of the module by up to 5%. The con- trol provides a convenient method for testing the operation of the load circuit over its supply voltage tolerance mar- gins. MARGUP: An open-collector/drain negative logic input that operates similar to the MARGDN control. Applying a ground signal to this input automatically decreases the output by up to 5%. 30-A Programmable ISR With Margin Up/Down Controls SL TS177B - DECEMBER 2002 - REVISED JULY 2006

For technical support and more information, see inside back cover or visit www.ti.com PT7681— 5V Typical Characteristics Specifications (Unless otherwise stated, T a =25°C, Vin =5V, Cin =1,500µF, Cout =330µF, Vo =3.3V, and Io =Iomax) PT7681 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 Tolerance V o tol All output voltages — ±10 ±25 (1) mV Temperature 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 Total Output Voltage Variation . Vo tol Includes set-point, line, load, — ±1.5 ±3 %V o–40°C =Ta =+85°C Efficiency . Io =15A V o =3.3V — 93 — Vo =2.5V — 92 — % Vo =1.8V — 89 — Io =30A V o =3.3V — 90 — Vo =2.5V — 87 — % Vo =1.8V — 83 — Vo Ripple (pk-pk) V r 20MHz bandwidth — 40 — mV pp Transient Response t tr 1A/µs load step, 50% and 100% I omax — 25 — µSec Vos Vo over/undershoot — ±200 (2) —mV Over-Current Threshold I TRIP Reset followed by auto-recovery — 38 — A Output Margin Adjust V o adj Pin 6 or 26 connected to pin 12 — ±5 — % 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 Temperature Range T a Over Vin Range –40 — 85 (5) °C Solder Reflow Temperature T reflow Surface temperature of module pins or case — — 215 (6) °C Storage Temperature T s — –40 — 125 °C 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 Suffix A — 20 (7) — G’s20-2000 Hz Suffixes N,C — TBD (7) — Weight — Vertical/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 (<1µA) 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 330µF for proper operation. An input capacitance of 1500µF is also requ ired. This must be rated for a minimum of 1.1Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For f urther 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 30ADC with a typical value of 1µH. 30-A Programmable ISR With Margin Up/Down Controls SL TS177B - DECEMBER 2002 - REVISED JULY 2006

For technical support and more information, see inside back cover or visit www.ti.com Performance Characteristics; V OUT =3.3V (See Note A) Safe Operating Area Curves (See Note B) Efficiency vs Output Current; V IN =5V Ripple vs Output Current Power Dissipation vs Output Current; V IN =5V PT7681, VIN =5VDC, VOUT =3.3V PT7681— 5V 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 PT7681, VIN =5VDC, VOUT =2.5V Note A: All characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered ty pical for the ISR. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures. 100 0 5 10 15 20 25 30 Iout (A ) Efficiency - % 0.00 2.00 4.00 6.00 8.00 10.00 12.00 0 5 10 15 20 25 30 Iout (A ) Pd - Watts 0 5 10 15 20 25 30 Iout (A ) Ripple - mV 5.5V 5.0V 4.5V VIN 30-A Programmable ISR With Margin Up/Down Controls SL TS177B - DECEMBER 2002 - REVISED JULY 2006

For technical support and more information, see inside back cover or visit www.ti.com PT7680 Series 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 0.6V. (0.3V 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. Margin Up/Margin Down The MARGUP/MARGDN controls allow up to a 5% momentary adjustment of the regulator’s output voltage set point. This adjustment is independent of the VID control inputs and provides a convenient method for testing the load circuit’s supply voltage margins. A 5% adjustment is made by simply connecting either control input directly to the remote sense ground. Adjustments of less than 5% can be accommodated by grounding the input through a suitably sized padding resistor. Note: These inputs must be controlled with a low-leakage (<1µA) open-collector/open-drain transistor. Do not add pull- up resistors or use a push-pull logic gate to drive these pins. Over-Temperature Protection The PT7680 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 recovery 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 To protect against load faults, the PT7680 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 a cycle of 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 rem oved, the converter automatically recovers 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 sense pins disconnected will not damage the regulator. An internal 15. resistor, connected between each sense pin and its corresponding output node, keeps the output voltage in regulation. If the remote sense feature is not Operating Features and System Considerations for the PT7680 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 PT7681 with a 15-A load, and with the output voltage programmed to 3.3V. 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 NotesApplication Notes Table 2-1: Input/Output Capacitors Capacitor Recommendations for the PT7680 Series of 30-A Switching Regulators Input Capacitor: The recommended input capacitance is determined by 1.1A minimum ripple current rating and 1500µF mini- mum capacitance. Ripple current and <100m . equivalent series resistance (ESR) values are the major considerations, along with temperature, when designing with different types of capacitors. Tantalum capacitors have a recommended minimum voltage rating of twice the maximum DC voltage + AC ripple. This is necessary to insure reliabil- ity for input voltage bus applications. Output Capacitors: The ESR of the required capacitors is less than 100m . . Electrolytic capacitors have marginal ripple performance at frequencies greater than 400kHz but excellent low frequency transient response. Above the ripple frequency, ceramic capacitors are necessary to im prove 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 Table 2-1. PT7680 Series Tantalum Capacitors( Optional Output Capacitors) Tantalum type capacitors can be used for the output but only the AVX TPS series, Sprague 593D/594/595 series or Kemet T495/T510 series. These capacitors are rec- ommended 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 ca- pability. The TAJ series is also less reliable than the AVX TPS series when determining power dissipation capa- bility. Tantalum or Oscon® types are recommended for applications where ambient temperatures fall below 0°C. Capacitor Table Table 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 (Equivalent Series Resistance at 100kHz) are critical parameters necessary to insure both optimum regulator performance and long capacitor life. roticapaC /rodneV seireS scitsiretcarahCroticapaCy titnauQ gnikroW egatloV )Fµ(eulaVt nelaviuqE)RSE( ecnatsiseRseireS mumixaMC°501 elppiR )smrI(tnerruC lacisyhP )mm(eziS tupnI suB tuptuO suB rebmuNrodneV cinosanaP )TMS(KF )laidaR(CF V52 V53 V61 V61 0022 033 074 0051 830.0 . 080.0 . 090.0 . 340.0 . Am0081 Am058 Am557 Am0961 5.61x61 2.01x01 5.21x01 51x61 M222E1KFVEE P133V1KFVEE 174C1CFUEE S251C1CFUEE ZXLdetinU noC-imehC XF V52 V61 V01 033 0051 086 090.0 . 830.0 . 510.0 . Am067 Am0661 Am5374 5.21x01 02x5.21 5.01x01 LL21X01M133BV52ZXL LL02X21M251BV61ZXL M086XF01 nocihciN seireSLP )MS(XN V52 V01 V01 093 0051 033 080.0 . 050.0 . 420.0 . Am027 Am0331 Am0773 51x5.21 51x61 8x01 6HHM193E1LPU 6HHM251A1LPU SG1RCM133A1XNP nocsO )laidaR(PS )TMS(PVS V01 V01 074 033 510.0 . 710.0 . Am0154> Am0593> 5.01x01 3.8x21x9 M074PS01 M033PVS01 XVA mulatanaT seireS-SPT V01 V01 033 033 01.0 . 060.0 . Am4141 Am6281 xL3.7 xW3.4 H1.4 0010R010M733VSPT 0600R010M733VSPT eugarpS mulatnaT D495/D595 V01 V01 033 086 540.0 . 110.0=4 . 90.0 . Am0054> Am0151> xL3.7 xW7.5 H0.4 T2R0100X733D495 T2R0100X786D595 )tnuoMecafruS( temeK mulatnaT 594T/015T seireS V01 V01 033 022 530.0 . 70.0 . 530.0=2 . Am0002 Am0002> L3.7xW3.4 H0.4x SA010M733X015 SA010M722X594T )tnuoMecafruS( pacsoPoynaS BPT V010 224 0.0 . Am0003x L2.7 xW3.4 H1.3

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Orderable Device Status(1) Package Type Package Drawing Pins Package Qty Eco Plan(2) Lead/Ball FinishMSL Peak Temp (3) PT7681N ACTIVE SIP MOD ULE ENE 27 10 TBD Call TI Level-1-215C-UNLIM (1)The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2)Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontentfor the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS):TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt):This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br):TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. PACKAGE OPTION ADDENDUM www.ti.com 28-Jul-2006 Addendum-Page 1

MMSI031 – SEPTEMBER 2001 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 ENE (R–MSIP–T27) METAL SINGLE-IN-LINE MODULE 4203526/A 08/01 3.00 (76,20) MAX. 1.02 (25,90) MAX. 0.160 (4,06) TYP. 0.050 (1,27) TYP. 0.100 (2,54) TYP. 0.025 (0,63) TYP. 0.500 (12,70) PC Layout 2.928 (74,37) 3.028 (76,91) 0.090 (2,28)

2 Places

0.100 (2,54) 26 Places ø0.045 (1,14) MIN. 27 Places 0.017 (0,43) TYP. 0.050 (1,27) Note E 0.050 (1,27) TYP. 0.140 (3,55) MIN. See Note F 0.66 (16,76) MAX. ø0.093 (2,36) MIN. 4 Places Plated through holes. See Note G. 0.110 (2,79) 0.70 (17,78) 0.040 (1,01) 0.54 (13,71) 0.350 (8,89) Plated through Note G 0.164 (4,16) Suffix N NOTES: A. All linear dimensions are in inches (mm). B. This drawing is subject to change without notice. C. 2 place decimals are /C00060.030 (/C00060,76mm). D. 3 place decimals are /C00060.010 (/C00060,25mm). E. Recommended mechanical keep out area. F. Electrical pin length mounted on printed circuit board, from seating plane to pin end. G. The case may be electrically connected to power ground plane.

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