PT7708C

PT7708-3.3V TI1 | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 4

Technical content

For technical support and more information, see inside back cover or visit www.ti.com/powertrends Standard Application For STBY* pin: open = output enabled ground = output disabled. Pin-Out Information Pin Function

1 VID0

2 VID1

3 VID2

5 STBY* - Stand-by

6 Do Not Connect

10 V in

11 V in

12 Remote Sense Gnd (4)

13 GND

15 GND

16 GND

17 GND

18 GND

Description

The PT7708 is a next generation “Big Hammer”, a high-performance Integrated Switching Regulator (ISR), which is made available in Power Trends’ aluminum 27-pin SIP pack- age. The PT7708 improves on the popular PT7706 with 20A of output current and short circuit protection. The PT7708 is suitable for exist- ing 5V system designs that require power for the latest high-speed, low- voltage µPs, and bus drivers. The PT7708 output is program- mable from 1.3V to 2.05V with a 4-bit input, which is compatible with the Intel Pentium Processor. A differ- ential remote sense is also provided to compensate for voltage drop between the ISR and load. Only 330µF of output capacitance are required for proper operation. Cin = Required 1500µF 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

25 V out

26 Remote Sense Vout

27 Sync Out

+ LOAD VIN VID0 VID1 VID2 VID3 VOUT GNDGND SYNC OUT STBY* REMOTE SENSE ( ) REMOTE SENSE (+) PROGRAMMING PINS PT7708 4321 2 6 20-25 125 13-1927 7-11 VoVin GND SNS(+) SNS(-) Synch OutSTBY VID3 - VID0 PT7708—3.3V

20 Amp Programmable

Next Generation “Big Hammer” SLTS083 (Revised 6/30/2000) Specifications Characteristics PT7708 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) —1 9 ATa = +25°C, natural convection 0.1 (1) —2 0 Input Voltage Range V in 0.1A ≤ Io ≤ 20A 3.1 — 3.6 V Output Voltage Tolerance ∆Vo Vin = +3.3V, Io = 20A Vo-0.03 — V o+0.03 V0°C ≤ Ta ≤ +65°C Line Regulation Reg line 3.1V ≤ Vin ≤ 3.6V, Io = 20A — ±10 — mV Load Regulation Reg load Vin = +3.3V, 0.1 ≤ Io ≤ 20A — ±10 — mV Vo Ripple/Noise V n Vin = +3.3V, Io = 20A — 50 — mV Transient Response t tr Io step between 10A and 20A — 50 — µSec with Cout = 330µF V os Vo over/undershoot — 100 — mV Efficiency η Vin = +3.3V, Io = 10A V o = 1.8V — 85 — % V o = 1.5V — 82 — Vin = +3.3V, Io = 20A V o = 1.8V — 78 — % V o = 1.5V — 74— Switching Frequency ƒ o 3.1V ≤ Vin ≤ 3.6V 300 350 400 kHz0.1A ≤ Io ≤ 20A Absolute Maximum T a Over Vin and Io Ranges –40 (2) —+ 8 5 (3) °C Operating Temperature Range Storage Temperature 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, — 10 — G’s20-2000 Hz, Soldered in a PC board Weight — Vertical/Horizontal — 31/41 — grams Notes: (1) ISR-will operate down to no load with reduced specifications. (2) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors. (3) See Safe Operating Area curves or contact the factory for the appropriate derating. (4) If the Remote Sense Ground is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy. External Capacitors: The PT7708 requires a minimum output capacitance of 330µF for proper operation. The PT7708 also requires an input capacitance of 1500µF , which must be rated for a minimum of 1.4Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For more information 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 20ADC with a typical value of 1µH.

For technical support and more information, see inside back cover or visit www.ti.com/powertrends Programming Information VID3 VID2 VID1 VID0 Vout 1 1 1 1 1.30V 1 1 1 0 1.35V 1 1 0 1 1.40V 1 1 0 0 1.45V 1 0 1 1 1.50V 1 0 1 0 1.55V 1 0 0 1 1.60V 1 0 0 0 1.65V 0 1 1 1 1.70V 0 1 1 0 1.75V 0 1 0 1 1.80V 0 1 0 0 1.85V 0 0 1 1 1.90V 0 0 1 0 1.95V 0 0 0 1 2.00V 0 0 0 0 2.05V

Features

• Single-Device: +3.3V input
• 4-bit Programmable: 1.3V to 2.05V@20A
• High Efficiency
• Differential Remote Sense
• Short-Circuit Protection
• Parallelable with PT7742 20A “Current Booster” Safe Operating Area (See Note B)

Ordering Information

PT7708❏❏❏❏❏ = 1.3 to 2.05 Volts (For dimensions and PC board layout, see Package Styles 800 and 810.) PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole N Horizontal Through-Hole A Horizontal Surface Mount C Logic 0 = Pin 12 potential (remote sense gnd) Logic 1 = Open circuit (no pull-up resistors) VID3 may not be changed while the unit is operating. Characteristic Data, Vin =3.3V (See Note A) PT7708—3.3V Next Generation “Big Hammer” Power Dissipation vs Output Current Efficiency vs Output Current Ripple vs Output Current Note A: All data in the above graphs has been developed from actual products tested at 25°C. The data is considered typical for the ISR Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating t emperatures. PT7708, VIN =3.3V, Vo =1.8V 0 4 8 1 21 62 0 Iout (A) Efficiency - % 1.8 1.5 VOUT 0 4 8 1 21 62 0 Iout (A) Ripple - mV 1.5 1.8 VOUT 0 4 8 1 21 62 0 Iout (A) Pd - Watts 1.5 1.8 VOUT 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 Iout (A) Ambient Temperature ( C) 200LFM 120LFM 60LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT7708/PT7709, PT7742/PT7743 Capacitor Recommendations for the PT7708/09 Regulators and PT7742/43 Current Boosters Input Capacitors The recommended input capacitance is determined by 1.4 ampere minimum ripple current rating and 1500µF minimum capacitance. Capacitors listed below must be rated for a minimum of 2x the input voltage with +5V operation. Ripple current and ≤100mΩ Equivalent Series Resistance (ESR) values are the major considerations along with temperature when selecting the proper capacitor. Output Capacitors The minimum required output capacitance is 330µF with a maximum ESR less than or equal to 100m Ω. Failure to observe this requirement may lead to regulator instability or oscillation. Electrolytic capacitors have poor ripple per- formance at frequencies greater than 400kHz, but excellent low frequency transient response. Above the ripple fre- quency ceramic decoupling capacitors are necessary to improve the transient response and reduce any microproces- sor high frequency noise components apparent during higher current excursions. Preferred low ESR type capaci- tor part numbers are identified in the Table 1 below. Note: (N/R) is not recommended for this application, due to extremely low Equivalent Series Resistance (ESR) Table 1 Capacitors Characteristic Data Tantalum Characteristics Tantalum capacitors with a minimum 10V rating are recommended on the output bus, but only the AVX TPS Series, Sprague 594/595 Series, or Kemet T495/T510 Series. The AVX TPS Series, Sprague Series or Kemet Series capacitors are specified over other types due to their higher surge current, excellent power dissipation and ripple current ratings. As an example, the TAJ Series by AVX is not recommended. This series exhibits considerably higher ESR, reduced power dissipation and lower ripple current capability. The TAJ Series is a less reliable compared to the TPS series when determining power dissipation capability. Capacitor Table Table 1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The suggested minimum quantities per regu- lator for both the input and output buses are identified. This is not an extensive capacitor list. The table below is a selection guide for input and output capacitors. Other capacitor vendors are available with comparable RMS ripple current rating and ESR (Equivalent Series Resistance at 100kHz). These critical parameters are necessary to insure both optimum regulator performance and long capacitor life. roticapaCr oticapaC roticapaC roticapaCr oticapaC /rodneV/ rodneV /rodneV /rodneV/ rodneV seireSs eireS seireS seireSs eireS scitsiretcarahCroticapaCs citsiretcarahCroticapaC scitsiretcarahCroticapaC scitsiretcarahCroticapaCs citsiretcarahCroticapaCy titnauQy titnauQ ytitnauQ ytitnauQy titnauQ gnikroWg nikroW gnikroW gnikroWg nikroW egatloVe gatloV egatloV egatloVe gatloV )Fµ(eulaV) Fµ(eulaV )Fµ(eulaV )Fµ(eulaV) Fµ(eulaVt nelaviuqE)RSE(t nelaviuqE)RSE( tnelaviuqE)RSE( tnelaviuqE)RSE(t nelaviuqE)RSE( ecnatsiseRseireSe cnatsiseRseireS ecnatsiseRseireS ecnatsiseRseireSe cnatsiseRseireS mumixaMC°501m umixaMC°501 mumixaMC°501 mumixaMC°501m umixaMC°501 elppiRe lppiR elppiR elppiRe lppiR )smrI(tnerruC) smrI(tnerruC )smrI(tnerruC )smrI(tnerruC) smrI(tnerruC lacisyhPl acisyhP lacisyhP lacisyhPl acisyhP )mm(eziS) mm(eziS )mm(eziS )mm(eziS) mm(eziS tupnIt upnI tupnI tupnIt upnI suBsuB suB suBsuB tuptuOt uptuO tuptuO tuptuOt uptuO suBsuB suB suBsuB rebmuNrodneVr ebmuNrodneV rebmuNrodneV rebmuNrodneVr ebmuNrodneV cinosanaP CF gtMecafruS AF V61 V53 V01 V61 0022 033 086 0081 830.0 Ω 560.0 Ω Ω090.0 Ω230.0 Am0002 Am5021 Am557 Am0002 5.61x81 5.61x5.21 5.21x01 51x81 N222C1CFVEE QL133V1CFVEE 186A1AFUEE A281C1AFUEE detinU noC-imehC seireSVFL V52 V61 V61 033 0022 074 480.0 Ω 830.0 Ω 480.0 Ω 240=2/ Ω Am528 Am0361 2xAm528 61x01 02x61 61x01 LL61X01M133BV52VXL LL02X61M222BV61VXL LL61X01M174BV61VXL nocihciN seireSLP seireSMP V01 V01 V52 086 0081 033 090.0 Ω 440.0 Ω 590.0 Ω Am077 Am0241 Am057 51x01 51x61 51x01 6HHM186A1LPU 6HHM281A1LPU 6HPM133E1LPU SSnocsO VS V01 V01 033 033 600.0=4/W520.0 Ω 500.0=4/020.0 Ω Am0089> Am0089> 5.01x01 6.21x3.01 R/N )etoN( M033SS01 gtMecavfuS(M033VS01 XVA mulatanaT seireS-SPT V01 V01 033 033 02=5/001.0 Ω 060.0 Ω Am0053 Am6281 xL3.7 xW3.4 H1.4 0010R010M733VSPT 0600R010M733VSPT eugarpS mulatnaT D495/D595 V01 V01 033 086 110.0=4/W540.0 Ω 090.0 Ω Am0054> Am0661> xL3.7 xW7.5 H0.4 T2R0100X733D495 tnuoMecafruS T2R0100X786D595 temeK mulatnaT 594T/015T seireS V01 V01 033 022 530.0 Ω 070.0 Ω 530.0=2/ Ω Am0002 Am0002> L3.7xW3.4 H0.4x SA010M733X015 SA010M722X594T tnuoMecafruS pacsoPoynaS BPT V010 220 40.0 Ω Am0003x L2.7 xW3.4 H1.3

62 M 022BPT01

(TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for

applications

design. Customers are responsible for their products and components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. TI products are not authorized for use in safety-critical (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety-critical applications. TI products are neither designed nor intended for use in military/aerospace "enhanced plastic." Only products designated by TI as military-grade meet military specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI products are neither designed nor intended for use in automotive requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products amplifier.ti.com Audio www.ti.com/audio Data Converters dataconverter.ti.com Automotive www.ti.com/automotive DSP dsp.ti.com Broadband www.ti.com/broadband Clocks and Timers www.ti.com/clocks Digital Control www.ti.com/digitalcontrol Interface interface.ti.com Medical www.ti.com/medical Logic logic.ti.com Military www.ti.com/military Power Mgmt power.ti.com Optical Networking www.ti.com/opticalnetwork Microcontrollers microcontroller.ti.com Security www.ti.com/security RFID www.ti-rfid.com Telephony www.ti.com/telephony RF/IF and ZigBee Solutions www.ti.com/lprf Video Imaging www.ti.com/video Wireless www.ti.com/wireless Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright 2008, Texas Instruments Incorporated