PT6722—12V 14-A Low-Voltage Programmable Integrated Switching Regulator SLTS161 (Revised 10/2/2001) Features • 12V Input • 14-A Output Current • 5-Bit Programmable Output: 1.1V to 1.85V (25mV Steps) • VRM 9.0 Compatible • 82% Efficiency • Standby On/Off Control Description Ordering Information The PT6722 is a fully integrated 14-A switching regulator housed in a space-saving solderable package. The PT6722 operates from 12V to provide a high-performance 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 over-voltage protection (OVP) drive. PT6722o = 1.1 to 1.85 Volts • • • • • • 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 Pin Function Pin Function 1 OVP Drive 13 Rem Sense Gnd 2 Pwr Good 14 GND PT Series Suffix (PT1234x) 3 4 VID0 VID1 15 GND 16 GND Case/Pin Configuration Vertical Horizontal SMD Order Suffix Package Code 5 VID2 17 GND N A C (ELD) (ELA) (ELC) 6 VID3 18 GND 7 8 VID4 STBY* 19 Vout 20 Vout 9 Do not connect 21 Vout (Reference the applicable package code drawing for the dimensions and PC layout) 10 Vin 22 Vout 11 Vin 12 Vin 23 Rem Sense Vout ( 2) For STBY* pin: open = output enabled ground = output disabled. Standard Application VID0 VID1 VID2 VID3 PROGRAMMING PINS OVP DRV REMOTE SENSE (+) VID4 VIN 7 6 5 4 3 L1 10–12 PWR GOOD + CIN 1,000µF 23 19–22 PT6722 1µH R1 1 2 8 14–18 13 VOUT + COUT 330µF LOAD 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 PT6722—12V 14-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, Vin =12V, C out =330µF, and Io =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 Ts MTBF 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 Operating Temperature Range Storage Temperature Reliability Mechanical Shock — Mechanical Vibration — Weight Flammability — — Conditions 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 Min PT6722 Typ Max 0.1 (1) 0.1 (1) 10.8 — — — — — — — ±10 ±0.5 ±2.5 ±2.5 14 14 13.2 ±20 (2) — ±5 ±10 — ±25 ±36 — — — — — — 300 83 78 20 50 ±70 20 350 — — — — — 30 400 mVpp µs mV A kHz 4.0 –0.2 — — 330 (4) -40 -40 — 0.4 10 5 — — — Open (3) 1.0 – 10 15,000 +85 (5) +125 µA mA µF °C °C 11.7 — — 106 Hrs — 500 — G’s — 15 (6) — G’s — 26 — grams Units A VDC mV %Vo mV mV mV % V 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. (6) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing. External Capacitors: The PT6722 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 1.6Arms 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 3ADC with a typical value of 1µH. For technical support and more information, see inside back cover or visit www.ti.com Typical Characteristics PT6722—12V 14-A Low-Voltage Programmable Integrated Switching Regulator PT6722 Performance; Vin =12V (See Note A) PT6722 Thermal Derating; Vin =12V Efficiency vs Output Current Safe Operating Area; Vo =1.8V 90 85 80 Efficiency - % 80 VOUT 75 1.8V 1.5V 1.2V 70 65 60 Ambient Temperature (°C) 90 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 55 50 20 0 2 4 6 8 10 12 0 14 Iout (A) 2 4 6 8 10 12 Iout (A) Ripple vs Output Current 25 20 Ripple - mV VOUT 15 1.8V 1.5V 1.2V 10 5 0 0 2 4 6 8 10 12 14 Iout (A) Power Dissipation vs Output Current 8 7 6 VOUT Pd - Watts (See Note A) 5 1.8V 1.5V 1.2V 4 3 2 1 0 0 2 4 6 8 10 12 14 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 14 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, & PT6721/6722 Pin-Coded Output Voltage Programming on Non-Isolated “Excalibur™” Series ISRs Programmable versions of the PT6700 and PT6720 series of Excalibur ISRs incorporate a pin-coded output voltage control. These regulators include up to five control pins, identified VID0–VID4 (pins 3–7) respectively. By selectively grounding VID0-VID4, the output voltage of these regulators can be programmed in incremental steps over a specified output voltage range. The program code and voltage range is designed to be compatible with the “Voltage ID” specification defined for popular microprocessors. Refer to Figure 1 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. 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, 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 and may also activate the OVP drive output. If the program code cannot be asserted prior to power-up, pull pin 8 (STBY) to GND during the period that the input voltage is applied. The release of pin 8 will then to allow the device to initiate a soft-start power-up to the program voltage. 4. If active devices are used to ground the voltage control pins, low-level open drain MOSFET devices should be used over 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 PT6721/6722, & PT6725 Series Capacitor Recommendations for the PT6721, PT6722, and PT6725 Series of Regulators Input Capacitors The recommended input capacitance is determined by 1.6 ampere minimum ripple current rating and 1000µF minimum capacitance. Tantalum capacitors listed below cannot be used on the input bus since they are not rated for 12V operation. Ripple current and 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 50mW. Failure to observe this requirement may lead to regulator instability or oscillation. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz, but excellentlow frequency transient response. Above the ripple frequency ceramic decoupling capacitors are necessary to improve the transient response and reduce any microprocessor high frequency noise components apparent during higher current excursions. Preferred low ESR type capacitor part numbers are identified in the Table 1 below. Tantalum Characteristics Tantalum capacitors may be used on the output bus but only the AVX TPS series, Sprague 593D/594/595 series, or Kemet T495/T510 series. These capacitors are recommended over many other tantalum types due to their high surge current, excellent power dissipation and ripple current ratings. 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 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. 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 the critical parameters necessary to insure both optimum regulator performance and long capacitor life. Table 1 Capacitors Characteristic Data Capacitor Vendor/ Series Capacitor Characteristics Quantity Working Voltage Value(µF) (ESR) Equivalent Series Resistance 105°C Maximum Ripple Current(Irms) Physical Size(mm) Input Bus Output Bus Panasonic FC Series/ FA Series 35V 25V 25V 680 1000 1000 0.043Ω 0.038Ω 0.038Ω 1655mA 1655mA 1690mA 12.5x20 12.5x20 16x15 2 1 1 1 2 1 EEUFC1V681 EEUFC1E102 EEUFC1E102S United Chemi-con LFVSeries 35V 35V 16V 680 1000 470 0.034Ω 0.038Ω 0.084Ω÷2 =0.042Ω 1690mA 1630mA 825mA (x2) 12.5x25 16x20 10x16 2 1 N/R(1) 1 1 2 LXV35VB680M12X25LL LXV35VB102M16X20LL LXV16VB471M10X16LL Nichicon PL Series/ PM Series 35V 25V 35V 680 1200 1000 0.036Ω 0.039Ω 0.034Ω 1660mA 1600mA 1770mA 12.5x25 18x15 16x20 2 1 1 1 1 1 UPL1V681MHH UPL1E122MHH6 UPM1V102MHH6 Panasonic FC Series Surface Mtg 35V 25V 35V 1000 1000 470 0038Ω 0.038Ω 0.043Ω 2000mA 2000mA 1690mA 18x16.5 18x16.5 16x16.5 1 1 2 1 1 1 EEVFC1V102N EEVFC1E102N EEVFC1V471N OsconSS/SV Series 10V 10V 330 330 0.025Ω 0.020Ω 3500mA 3800mA 10x10.5 10.3x10.3 1 1 10SS330M (If Vo <5V) 10SV330 (If Vo <5V) Surface Mount (SV) AVX Tantalum TPS Series 10V 330 0.1Ω÷2 =0.05Ω >2500mA 2 TPSE337M010R0100 330 0.06Ω÷2 =0.03Ω >3000mA 7.3L x 5.7W x 4.1H N/R(1) 10V N/R(1) 2 TPSV337M010R0060 Surface Mount Kemet Tantalum T510/T495 Series 10V 330 0.033Ω 1400mA N/R(1) 1 510X337M010AS 10V 220 0.07Ω÷2 =0.035Ω 4.3Wx7.3L x4.0H >2000mA N/R(1) 2 T495X227M0100AS Surface Mount Sprague Tantalum 594D Series 10V 330 0.045Ω 2360mA N/R(1) 1 594D337X0010R2T Surface Mount 7.2L x 6W x 4.1H N/R(1) N/R(1) Vendor Part Number Note: (N/R) 10V tantalums are not recommend for the input bus. 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