PT6703—3.3V/5V 13-A Low-Voltage Programmable Integrated Switching Regulator SLTS151 (Revised 6/26/2001) Features • +3.3V/5V Input • 13-A Output Current • 5-Bit Programmable Output: 1.1V to 1.85V (25mV Steps) • VRM 9.0 Compatible • 86% Efficiency • Standby On/Off Control • • • • • • Differential Remote Sense Over-Voltage Protection Drive Power Good Signal Short Circuit Protection Space Saving Solderable Case 4.7·106 Hrs. MTBF Pin-Out Information Description Ordering Information The PT6703 is a fully integrated 13 A switching regulator housed in a space-saving solderable package. The PT6703 will operate from either a 3.3V or 5V input to provide a highperformance low-voltage output that is programmable over the range 1.1V to 1.85V. This output voltage range is specifically suited to high performance µP and DSP applications that require core supply voltages below 1.3V. The voltage control inputs are also TTL compatible. Additional features include output short circuit protection, a “Power Good” output, and an overvoltage protection (OVP) drive. PT6703o = 1.1 to 1.85 Volts (For dimensions and PC board layout, see Package Styles 1300 & 1310.) PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount N A C Pin Function Pin Function 1 OVP Drive 13 Remote Sense Gnd 2 3 Pwr Good VID0 14 15 GND GND 4 VID1 16 GND 5 VID2 17 GND 6 7 VID3 VID4 18 19 GND Vout 8 STBY* 20 Vout 9 Do not connect 21 Vout 10 11 Vin Vin 22 23 Vout Remote Sense Vout 12 Vin ( 2) For STBY* pin: open = output enabled ground = output disabled. Standard Application PROGRAMMING PINS OVP DRV VID0 VID1 VID2 VID3 VID4 VIN REMOTE SENSE (+) 7 6 5 4 3 L1 10–12 CIN 1,000µF + 23 2 8 14–18 VOUT 19–22 PT6703 1µH R1 1 13 COUT 330µF + LOAD PWR GOOD GND GND STBY* REMOTE SENSE (-) C in/C out : Required electrolytic capacitors –see footnotes. L 1: Optional 1µH input choke –see footnotes R1 : 10-kΩ pull-up for Pwr Good signal. Pwr Good is high when the output is within specification. For technical support and more information, see inside back cover or visit www.ti.com PT6703—3.3V/5V 13-A Low-Voltage Programmable Integrated Switching Regulator Programming Information VID3 VID2 VID1 VID0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 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 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 VID4=1 Vout PT6700 Product Family Comparison VID4=0 Vout 0.000V 1.100V 1.125V 1.150V 1.175V 1.200V 1.225V 1.250V 1.275V 1.300V 1.325V 1.350V 1.375V 1.400V 1.425V 1.450V Input Voltage 1.475V 1.500V 1.525V 1.550V 1.575V 1.600V 1.625V 1.650V 1.675V 1.700V 1.725V 1.750V 1.775V 1.800V 1.825V 1.850V Program Range OVP/ +12V Bias Pwr Good Required PT6701 5V 5-Bit 1.3V– 3.5V ü PT6702 3.3V 4-Bit 1.3V– 2.05V ü PT6703 3.3V/5V 5-Bit 1.1V– 1.85V ü # PT6705 5V Resistor 1.5V–3.3V # PT6715 5V Resistor 1.5V–3.3V PT6721 12V 5-Bit 1.3V– 3.5V ü PT6722 12V 5-Bit 1.1V– 1.85V ü # PT6725 12V Resistor 1.5V–5.0V ü # –Indicates a series of products that have a nominal output voltage set-point and may be adjusted with an external resistor. Logic 0 = Pin 13 potential (remote sense gnd) Logic 1 = Open circuit (no pull-up resistors) VID4 may not be changed while the unit is operating. Specifications Adjust Method (Unless otherwise stated, Ta =25°C, V in =3.3V, C out =330µF, and I o =Iomax) Characteristic Symbol Output Current Io Input Voltage Range Set Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Voltage Variation Vin Vo tol Regtemp Regline Regload ∆Votot Efficiency η Vo Ripple (pk-pk) Transient Response Vr ttr ∆Vtr Isc ƒo 20MHz bandwidth 0.1A/µs load step, 6A to 12A Vo over/undershoot VIH V IL IIL Iin standby Cout Ta Referenced to GND (pin 14) Short Circuit Current Switching Frequency Standby Control (pin 8) Input High Voltage Input Low Voltage Input Low Current Standby Input Current External Output Capacitance Maximum Operating Temperature Range Storage Temperature Reliability Ts MTBF Mechanical Shock — Mechanical Vibration — Weight Flammability — — Conditions Min Ta =+60°C, 200LFM Ta =+25°C, natural convection Over Io Range –40° >Ta > +85°C Over Vin range Over Io range Includes set-point, line, load, –40° >Ta > +85°C Io =8A Over Vin range Pin 8 to GND pins 8 & 14 connected Over Vin range — Per Bellcore TR-332 50% stress, Ta =40°C, ground benign Per Mil-Std-883D, method 2002.3, 1mS, half-sine, mounted to a fixture Per Mil-Std-883D, method 2007.2, 20-2000Hz, soldered in a PC board — Materials meet UL 94V-0 Vo =1.8V Vo =1.2V PT6703 SERIES Typ Max Units 0.1 (1) 0.1 (1) 3.1 — — — — — — — ±10 ±0.5 ±2.5 ±2.5 13.0 13.0 5.5 ±20 (2) — ±5 ±10 — ±25 — — — — — — — 300 86 81 25 50 ±100 20 350 — — — — — — 400 mVpp µs mV A kHz — –0.2 — — 330 (4) -40 — 0.4 10 20 — — Open (3) 1.0 – 30 15,000 +85 (5) µA mA µF °C A VDC mV %Vo mV mV mV % V -40 — +125 °C 4.7 — — 106 Hrs — 500 — G’s — 15 — G’s — 26 — grams Notes: (1) ISR-will operate down to no load with reduced specifications. (2) If the remote sense ground is not used, pin 13 must be connected to pin 14 for optimal output voltage accuracy. (3) The Standby control (pin 8) has an internal pull-up, and if left open-circuit the module will operate when input power is applied. A small low-leakage (<100nA) MOSFET must be used to control this input. The open-circuit voltage is less than 10V. See application notes for further information. (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. External Capacitors: The PT6703 requires a minimum ouput capacitance of 330µF, and a minimum input capacitance of 1,000µF for proper operation. The input capacitance must be rated for a minimum of 1.0Arms of ripple current. For transient or dynamic load applications, additional input and output capacitance may be required.The maximum allowable output capacitance is 15,000µF. For more information refer to the application note regarding capacitor selection for this product. Input Inductor: An input filter inductor is optional for most applications. The inductor must be sized to handle 10.0ADC with a typical value of 1µH. For technical support and more information, see inside back cover or visit www.ti.com Typical Characteristics PT6703 Series 20-Watt 48V-Input Isolated DC/DC Converter PT6703 Characterization, Vin =3.3V (See Note A) PT6703 Characterization, Vin =5V Efficiency vs Output Current Efficiency vs Output Current 90 90 VIN 80 1.8V 1.2V 70 Efficiency - % 100 Efficiency - % 100 60 VIN 80 1.8V 1.2V 70 60 50 50 0 2 4 6 8 10 12 0 2 4 Iout (A) 25 20 20 VIN 15 1.8V 1.2V 10 Ripple - mV Ripple - mV 8 10 12 Ripple vs Output Current 25 5 VIN 15 1.8V 1.2V 10 5 0 0 0 2 4 6 8 10 12 0 2 4 Iout (A) 6 8 10 12 Iout (A) Power Dissipation vs Output Current Power Dissipation vs Output Current 6 6 5 5 VIN 1.8V 1.2V 3 4 Pd - Watts 4 Pd - Watts 6 Iout (A) Ripple vs Output Current VIN 1.8V 1.2V 3 2 2 1 1 0 0 0 2 4 6 8 10 12 0 2 4 Iout (A) 6 8 10 12 Iout (A) Safe Operating Area Curve Safe Operating Area Curve (See Note B) (See Note B) PT6703, @Vin =5.0V PT6703, @Vin =3.3V 90 90 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 Ambient Temperature (°C) 80 Ambient Temperature (°C) (See Note A) Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 30 20 20 0 2 4 6 8 10 12 Iout (A) 0 2 4 6 8 10 Iout (A) Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter. Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures For technical support and more information, see inside back cover or visit www.ti.com 12 Application Notes PT6701/6702/6703, & PT6721/6722 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 open-drain 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 10-kΩ 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. Figure 1 OVP DRV 7 6 5 4 3 VID4 - VID0 10-12 5V R1 10k + 1 OVP 23 SNS(+) PT6700 Vin Pwr Good 2 STBY 8 GND 14-18 C in 19-22 Vo V o =2.5V SNS(-) 13 + C out L O A D Pwr Good Q1 BSS138 Inhibit COM COM 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 (via a fuse), 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. 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 ground1 places the regulator in standby mode 2, 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 properly enabled, pin 8 must be open circuit. Notes: 1. The standby on a PT6700 series regulator must be controlled with an open-drain low-leakage (<100nA) MOSFET (See fig. 1). Table 1 gives the threshold requirements. Do Not use a pull-up resistor. The control input has an open-circuit voltage of between 4Vdc and 5Vdc. To set the regulator output to zero, the control pin must be “pulled” to less than 1.0Vdc by sinking current to ground. 2. 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 overstress the part. Turn-On Time Turning Q1 in Figure 1 off, removes the low-voltage signal at pin 8. After a 10-15ms delay the regulator output rises and reaches full output voltage within 30ms. Fig. 2 shows the typical waveforms of a PT6701 following the prompt turn-off of Q1 at time t =0 secs. The output voltage was set to 2.5V, and the waveforms were measured with a 5V input source, and 10A resistive load. Figure 2 Vout (2V/Div) Table 1 Standby Control Requirements Parameter Min Typ Enable Open Cct. 1 Disable -0.1V Istby 0.4V 2 Iin (5A/Div) Max 1.0V VPWGD (10V/Div) 10µA 0 5 10 15 20 25 30 35 t (milli - secs) For technical support and more information, see inside back cover or visit www.ti.com 40 Application Notes continued PT6701/6702/6703, & PT6721 Pin-Coded Output Voltage Adjustment on the NonIsolated “Excalibur™” Series ISRs The PT6701/6702/6703, and PT6721/6722 Excalibur™ ISRs incorporate a pin-coded control to program the output voltage. Depending on the resolution and adjustment range, there are up to five control pins. They are identified VID0–VID4 (pins 3–7) respectively. When the control pins are left open-circuit the ISR output will regulate at its factory trimmed output voltage. By selectively grounding VID0-VID4, the output voltage can be programmed in incremental steps over the specified output voltage range. The program code and output voltage range of these ISRs may also be compatible with the “Voltage ID” specification defined for popular microprocessors. Refer to Figure 1 below for the connection schematic, and the applicable Data Sheet for the program code. 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. 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 opendrain 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 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 new program voltage. Figure 1 7 V in 10-12 1 µH (Optional) 6 5 4 3 VID4 - VID0 1 OVP 23 SNS(+) PT6700 Vin Pwr Good 2 STBY GND 14-18 8 Vo 19-22 V out SNS(-) 13 + + C in C out L O A D Q1 STBY COM For technical support and more information, see inside back cover or visit www.ti.com COM Application Notes PT6703 Capacitor Recommendations for the Non-Isolated 13-A Excalibur™ Series of Regulators 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 a caution, 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. Input Capacitors The recommended input capacitance is determined by the 1.0 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. 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 e r i s t i c s Qu a n t i t y Working Voltage Value(µF) ( ESR) Equi v al e nt Se r i e s Re s i s t anc e 8 5 ° C Ma x i m u m Ri ppl e C u r r e n t ( I r ms ) Phy s i c al S i z e ( mm) I nput Bu s Ou t p u t Bu s Panasonic FC Surface Mtg 10V 35V 1000 330 0.065Ω 0.065Ω 1205mA 1205mA 12.5x16.5 12.5x16.5 1 1 1 EEVFC1A102LQ EEVFC1V331LQ FC Radial 25V 10V 330 1200 0.090Ω 0.065Ω 765mA 1205mA 10x12.5 12.5x15 1 1 1 EEUFA1E331 EEUFC1A122S United Chemi -Con LFZ Radial FX Surface Mtg 25V 10V 6.3V 10V 330 1000 1000 680 0.090Ω 0.068Ω 0.013Ω 0.015Ω/2=0.007Ω 760mA 1050mA 4935mA >7000mA 10x12.5 10x16 10x10.5 10X10.5 1 1 2 1 1 1 1 LXZ25VB331M10X12LL LXZ35VB102M10X16LL 6FX1000M(Vin 3.3V) 10FX680M(Os-con) Nichicon PL Series PM Series 25V 10V 25V 330 1000 330 0.095Ω 0.065Ω 0.095Ω 750mA 1040mA 750mA 10x15 12.5x15 10x15 1 1 1 1 UPL1E331MPH6 UPL1A102MHH6 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 1 680 0.090Ω/4=0.023Ω >2500mA 7.2L x 6.0W x 3.5H 3 10V 2 1 594D337X0010R2T Surface Mount 595D687X0010R2T 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 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 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 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 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, license, warranty or endorsement thereof. Reproduction of 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. Representation or reproduction of this information with alteration voids all warranties provided for an associated TI product or service, is an unfair and deceptive business practice, and TI is not responsible nor liable for any such use. Resale of TI’s 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, is an unfair and deceptive business practice, and TI is not responsible nor liable for any such use. Also see: Standard Terms and Conditions of Sale for Semiconductor Products. www.ti.com/sc/docs/stdterms.htm Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2001, Texas Instruments Incorporated