PT6702—3.3V 13 Amp Programmable Integrated Switching Regulator SLTS070A (Revised 10/31/2000) The PT6702 is 13Amp fully integrated switching regulator housed in a unique, spacesaving package. The PT6702 operates from +3.3V input to provide a high-performance, low-voltage power source for the industry’s latest µPs, DSPs, and bus drivers. The output is programmable from 1.3V to 2.05V with a 4-bit input, compatible with Intel’s Pentium® II Processor. The PT6702 has short circuit protection, a “Power Good” output, and an over-voltage protection (OVP) drive output. • +3.3V Input • 4-bit Programmable: 1.3V to 2.05V • High Efficiency • Differential Remote Sense • Short Circuit Protection • Over-Voltage Drive • Power Good Signal • Space Saving SIP Package • Solderable Copper Case e g Packag in v a -S e c New Spa Patent pending on package assembly Standard Application VID0 VID1 VID2 VID3 Input Voltage Vout Adjust PT6701 5V VID 3 PT6702 3.3V VID 3 PT6705 5V Resistor PT6715 5V Resistor PT6721 12V VID PT6725 12V Resistor REMOTE SENSE (+) 6 5 4 3 VIN PT6700 Product Family OVP DRV PROGRAMMING PINS 1 23 L1 PT6702 10 - 12 1µH R1 CIN + 2 14 - 18 8 VOUT 19 - 22 13 COUT + LOAD PWR GOOD GND GND STBY* OVP/ Pwr Good Requires +12V Bias 3 3 REMOTE SENSE (-) Cin = Required 1000µF electrolytic Cout= Required 330µF electrolytic L1 = Optional 1µH input choke R1 = Required 10kΩ pull-up when using Pwr Good signal. Pwr good output is high when the output voltage is within specification. Specifications PT6702 SERIES Characteristics (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current Io Ta = +60°C, 200 LFM, pkg N Ta = +25°C, natural convection 0.1 0.1 (1) (1) — — 13.0 13.0 A Input Voltage Range Vin 0.1A ≤ Io ≤ 13.0A 3.1 (2) — 3.6 V Output Voltage Tolerance ∆Vo Vin = +3.3V, Io = 13.0A –40°C ≤ Ta ≤ +85°C Vo-0.03 — Vo+0.03 V Line Regulation Regline 3.1V ≤ Vin ≤ 3.6V, Io = 13.0A — ±10 — mV Load Regulation Regload Vin = +3.3V, 0.1 ≤ Io ≤ 13.0A — ±20 — mV Vo Ripple/Noise Vn Vin = +3.3V, Io = 13.0A — 50 — mV Transient Response with Cout = 330µF ttr Vos Io step between 6A and 12A Vo over/undershoot — — 50 100 — — µSec mV Efficiency η Vin = +3.3V, Io = 8A — — 86 84 — — % % Switching Frequency ƒo 3.1V ≤ Vin ≤ 3.6V 0.1A ≤ Io ≤ 13.0A 300 350 400 kHz Absolute Maximum Operating Temperature Range Ta Over Vin –40 (3) — +85 (4) °C Storage Temperature Ts — –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, 20-2000 Hz, Soldered in a PC board — 15 — G’s — — 26 — grams Weight Notes: (1) (2) (3) (4) (5) — Vo = 1.8V Vo = 1.5V and Io Ranges ISR-will operate down to no load with reduced specifications. The minimum input voltage is 3.1V or Vout+1.1V, whichever is greater. For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors. See Safe Operating Area curves. If the remote sense ground is not used, pin 7 must be connected to pin 8 for optimal output voltage accuracy. Output Capacitors: The PT6702 requires a minimum ouput capacitance of 330µF for proper operation. The maximum allowable output capacitance is 15,000µF. Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 10.0ADC with a typical value of 1µH. The input capacitance must be rated for a minimum of 2.0Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT6702—3.3V 13 Amp Programmable Integrated Switching Regulator Pin-Out Information Pin Function Pin Function 1 2 OVP Drive Pwr Good 13 14 GND 3 4 VID0 VID1 15 16 GND GND 5 6 VID2 VID3 17 18 GND GND 7 8 Connect to Pin 13 STBY* 19 20 Vout Vout 9 10 Vin 21 22 Vout Vout 11 12 Vin Vin 23 Remote Sense Vout Do not connect Remote Sense Gnd Ordering Information VID3 VID2 VID1 VID0 PT6702o = 1.3 to 2.05 Volts 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 (5) 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 Vout 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 (For dimensions and PC board layout, see Package Styles 1300 and 1310.) 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 PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount N A C Logic 0 = Pin 13 potential (remote sense gnd) Logic 1 = Open circuit (no pull-up resistors) VID3 may not be changed while the unit is operating. For STBY* pin open = output enabled ground = output disabled. T Y P I C A L PT6702, VIN =3.3V Programming Information C H A R A C T E R I S T I C S Safe Operating Area Curves (See Note A) Efficiency vs Output Current (See Note B) PT6702, @Vin =3.3V & Vo = 1.8V 90 90 Efficiency - % 80 75 VOUT 70 1.8 65 60 Ambient Temperature (°C) 85 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 55 30 50 0 2 4 6 8 10 0 12 2 4 6 8 10 12 Output Current (A) Iout (A) Ripple vs Output Current 25 Ripple - mV 20 15 VOUT 1.8 10 5 0 0 2 4 6 8 10 12 Iout (A) Power Dissipation vs Output Current 6 5 Pd - Watts 4 VOUT 3 1.8 2 1 0 0 2 4 6 8 10 12 Iout (A) Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typcial for the ISR Note B: SOA curves represent the conditions at which internal components are at or below manufacturer’s maximum operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes PT6701/PT6702/PT6721 Operating Features of the Programmable PT6700 “Excalibur™” Series ISRs Power Good Programmable versions of the PT6700 Series regulators incorporate a PWR Good output (pin 2). This output is opendrain and generates an acitve-high signal when the sensed output from the ISR is within a nominal ±10% of the programmed set point. When the regulated output is outside this range, pin 2 asserts a logic low (typically <0.1V). A 10KΩ pull-up resistor to a valid bus voltage is required. If the power good feature is not used, the pull-up resistor can be omitted. The maximum voltage that may be applied to the pull-up resistor is 15V. Over-Voltage Protection (OVP) The PT6700 programmable regulators also incorporate an OVP function. The OVP DRV (pin 1) normally has a logic low output (typically <0.1V). When the ISR’s sensed output exceeds the programmed output setting by 15%, pin 1 produces a 60mA, +12V drive signal. This drive signal can trigger an SCR, which can be used to disable the input voltage, or alternatively interface to another external monitoring device. When the ISR output voltage returns to within 15% of its programmed setting, pin 1 reverts back to its low state. If the OVP function is not used, pin 1 may be left open circuit. 2. The Standby input can also be interfaced to TTL or other bi-directional output device using a schottky diode. See Figure 1. 3. When placed in the standby mode, the regulator output may assert a low impedance to ground. If an external voltage is applied to the output, it will sink current and possibly over-stress the part. Table 1 Inhibit Control Threshold 2,3 Parameter Min Typ Enable (VIH) 3.0V Disable (VIL) -0.1V Max 0.4V Istby 1..0V 0.01mA Figure 1 OVP DRV 7 10-12 5V R1 10k 6 5 4 3 VID4 - VID0 23 SNS(+) 19-22 PT6700 Vin Pwr Good 2 + 1 OVP STBY 8 V o =2.5V Vo SNS(-) GND 14-18 C in 13 + C out L O A D Pwr Good Q1 BSS138 Inhibit COM COM Stand-By Function The PT6700 series ISRs incorporate a standby function. This feature may be used for power-up sequencing, or wherever there is a requirement for the output voltage to be controlled by external circuitry. If the STBY* input (pin 8) is left open-circuit the regulator operates normally, providing a regulated output when a valid supply voltage is applied to Vin (pins 10-12) with respect to GND (pins 14-18). Connecting pin 8 to ground 1 places the regulator in standby mode, and reduces the input current to typically 20mA (30mA max). Applying a ground signal to pin 8 prior to power-up, will disable the output during the period that input power is applied. To ensure that the regulator output is fully enabled, pin 8 must be allowed to rise to a minimum of 3.0V. 5V D1 BAT54 * * or equiv. Schottky diode Turn-On Time Turning Q1 in Figure 1 off, removes the low-voltage signal at pin 8 and enables the output. Following a brief delay of 10-15ms, the output voltage of the PT6700 regulator rises to full regulation within 30ms. Figure 2 shows the typical output voltage waveform of a PT6701 following the prompt turn-off of Q1 at time t =0 secs. The output voltage was set to 2.5V. The waveforms were measured with a 5V input source voltage, and 10A resistive load. Figure 2 Notes: Vout (2V/Div) 1. The standby on the PT6700 series is ideally controlled with an open-collector (or open-drain) discrete transistor (See fig. 1). Table 1 gives the threshold requirements. Do Not use a pull-up resistor. The control input has an opencircuit voltage of about 4.0Vdc. To set the regulator output to zero, the control pin must be “pulled” to less than 1.0Vdc with a sink to ground. Iin (5A/Div) VPWGD (10V/Div) 0 5 10 15 20 t (milli - secs) For technical support and more information, see inside back cover or visit www.ti.com/powertrends 25 30 35 40 Application Notes continued PT6701/PT6702/PT6721 Series Pin-Coded Output Voltage Adjustment on Non-Isolated “Excalibur™” Series ISRs 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 voltage control circuit. Discrete transistors such as the BSS138, 2N7002, IRLML2402, or the 74C906 hex open-drain buffer are examples of appropriate devices. The PT6701/6702/6721 Excalibur™ ISRs incorporate a pin-coded voltage control to adjust the ouput voltage. The control pins are identified VID0 - VID4 (pins 3–7) respectively. When these 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. The program code and output voltage range of these ISRs is compatible with the voltage ID specification defined by Intel Corporation. The code is used in conjuction with voltage regulator modules (VRMs) that are used to power Intel’s Pentium® microprocessors. Refer to Figure 1 below for the connection schematic, and the respective device Data Sheet for the appropriate programming code information. 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 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 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 8 (STBY) to the device GND during the period that the input voltage is applied to Vin. Releasing pin 8 will then allow the device output to initiate a soft-start power-up to the programmed voltage. Notes: 1. The programming convention is as follows:Logic 0: Connect to pin13 (Remote Sense Ground). Logic 1: Open circuit/open drain (See notes 2, & 4) 2. Do not connect pull-up resistors to the voltage programming pins. 3. To minimize output voltage error, always use pin 13 (Remote Sense Ground) as the logic “0” reference. While the regular ground (pins 14-18) can also be used for programming, doing so will degrade the load regulation of the product. Figure 1 7 6 5 4 3 1 VID4 - VID0 V in 10-12 1 µH (Optional) OVP 23 SNS(+) 19-22 PT6700 Vin Pwr Good 2 STBY GND 8 14-18 V out Vo SNS(-) 13 + + C in C out L O A D Q1 STBY COM COM For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes continued PT6701, PT6702, PT6705 Series, & PT6715 Series Capacitor Recommendations for the Non-Isolated 13A Excalibur™ Series of Regulators Input Capacitors The recommended input capacitance is determined by the 2.0 ampere minimum ripple current rating and 1000µF 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 100mΩ. Failure to observe this requirement may lead to regulator instability or oscillation. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz, but excellent low frequency transient response. Above the ripple frequency ceramic decoupling 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 Table 1 below. 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 regulator for both the input and output buses are identified. This is not an extensive capacitor list. The table below is a suggested 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. Table 1 Capacitors Characteristic Data Capac i t or Vendor Ser i es Capac i t or Char ac t er i st i c s Quant i t y Wor k i ng Vol t age Val ue( µF) ( ESR) Equi val ent Ser i es Resi st anc e 8 5 ° C Maxi mum Ri ppl e Cur r ent ( I r ms) Physi c al Si ze( mm) I nput Bus Out putt Bus Panasonic FC Surface Mtg 25V 35V 1000 330 0.038Ω 0.065Ω 2000mA 1205mA 18x16.5 12.5x16.5 1 1 1 EEVFC1E102N EEVFC1V331LQ FA Radial 25V 25V 330 1200 0.090Ω 0.032Ω 765mA 2000mA 10x12.5 18x15 1 1 1 EEUFA1E331 EEUFA1E122S United Chemi -Con LFV Radial FX Surface Mtg 25V 35V 16V 10V 330 1200 2700 680 0.084Ω 0.028Ω 0.028Ω 0.015Ω/2=0.007Ω 825mA 2070mA 2070mA >7000mA 10x16 16x25 16x25 10X10.5 1 1 2 1 1 1 1 LXV25VB331M10X16LL LXV35VB122M16X25LL LXV16VB272M16X25LL 10FX680M(Os-con) Nichicon PL Series PM Series 25V 25V 25V 330 2200 330 0.095Ω 0.028Ω 0.095Ω 750mA 2050mA 750mA 10x15 18x20 10x15 1 1 1 1 UPL1E331MPH6 UPL1E222MHH6 UPM1E331MPH6 Oscon SS SV 10V 10V 330 330 0.025Ω/3=0.008Ω 0.020Ω/3=0.007Ω >7000mA >7000mA 10x10.5 10.3x12.6 3 3 1 1 10SS330M 10SV330M(Surface Mtg) AVX Tanatalum TPS- Series 10V 10V 330 330 0.100Ω/3=0.034Ω 0.060Ω/3=0.02Ω >3500mA >3500mA 7.0Lx 5.97Wx 3.45H 3 3 1 1 TPSV337M010R0100 TPSV337M010R0060 Vishay/Sprague Tantalum 595D/594D 10V 330 0.045Ω/3=0.015Ω >4600mA 3 1 10V 680 0.090Ω/4=0.023Ω >2500mA 7.2L x 6.0W x 3.5H Kemet Tantalum T510/T495 Series 10V 330 0.035Ω/3=0.012Ω >5000mA 10V 220 0.070Ω/5=0.035Ω >3000mA Sanyo Poscap TPB 10V 220 0.040Ω/5=0.008Ω >3000mA 4.3Wx7.3L x4.0H 7.2L x 4.3W x 3.1H Vendor Number 2 1 594D337X0010R2T Surface Mount 595D687X0010R2T 3 1 T510X337M010AS 5 2 T495X227M010AS Surface Mount 5 2 10TPB220M Surface Mount For technical support and more information, see inside back cover or visit www.ti.com/powertrends 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 acknowledgment, 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. Customers are responsible for their applications using TI components. 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 2000, Texas Instruments Incorporated