PT6725 Series 14-A 12V-Input Adjustable Integrated Switching Regulator SLTS102A (Revised 1/14/2002) Features • • • • • • • • • Up to 14A Output Current +12V Input 93% Efficiency (PT6724) On/Off Standby Function Differential Remote Sense Adjustable Output Voltage Short Circuit Protection 17-pin Space-Saving Package Solderable Copper Case Description Ordering Information The PT6725 series of power modules are integrated switching regulators (ISRs), housed in a 17-pin space saving solderable copper package. These modules operate off a 12V input power bus to provide up to 14A of low-voltage power for the industry’s latest high-speed, DSPs, µPs, and bus drivers. The series includes the standard output bus voltage options, ranging from 1.2V to 5.0V. The factory preset voltage can also be adjusted over a limited range with a single external resistor. Features include a Standby function, output short circuit protection, and a differential Remote Sense to compensate for voltage drop between the ISR and load. The modules are available in both through-hole and surface mount configurations. PT6724H PT6725H PT6726H PT6727H PT6728H PT6729H = = = = = = 5.0 3.3 2.5 1.8 1.5 1.2 Pin-Out Information Volts Volts Volts Volts Volts Volts Pin PT Series Suffix (PT1234 x ) Case/Pin Configuration Order Suffix Package Code * N A C Vertical Horizontal SMD (EMD) (EMA) (EMC) * Previously known as package styles 1340/50. (Reference the applicable package code drawing for the dimensions and PC board layout) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Function Vo Adjust STBY* Do Not Connect Vin Vin Vin Remote Sense Gnd GND GND GND GND GND Vout Vout Vout Vout Remote Sense Vout * For further information, see application notes. Standard Application STBY* Vout Adjust REMOTE SENSE (+) 2 VIN L1 4-6 1µH CIN + 1 PT6725 8 - 12 17 VOUT 13 - 16 7 COUT + LOAD REMOTE SENSE (-) GND GND Cin = Required 1000µF electrolytic Cout= Required 330µF electrolytic L1 = Optional 1µH input choke For technical support and more information, see inside back cover or visit www.ti.com PT6725 Series 14-A 12V-Input Adjustable Integrated Switching Regulator Specifications (Unless otherwise stated, Ta =25°C, Vin =12V, C in =1,000µF, Cout =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 Short Circuit Threshold Switching Frequency Remote On/Off (Pin 2) Input High Voltage Input Low Voltage Input Low Current Vr ttr ∆Vtr Isc threshold ƒs VIH VIL IIL Standby Input Current External Output Capacitance External Input Capacitance Operating Temperature Range Storage Temperature Reliability Iin standby Cout Cin Ta 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, Io =Iomin Over Vin range Over Io range Includes set-point, line, load, –40° ≤Ta ≤ +85°C Io =9.0A 20MHz bandwidth 5A/µs load step, 50% to 100% Iomax Vo over/undershoot Over Vin and Io range Referenced to –Vin (pin 8) pins 2 & 8 connected See application schematic See application schematic 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 Mil-Std-883D, Method 2007.2, 20-2000Hz, soldered in PCB Vo ≤2.5V Vo >2.5V Vo =5.0V Vo =3.3V Vo =2.5V Vo =1.8V Vo =1.5V Vo =1.2V PT6725 SERIES Typ Max Units 0.1 (1) 0.1 (1) 10.8 — — — — — — — ±1 ±0.5 ±5 ±5 14 13 13.2 ±1.5 (2) — ±10 ±10 A — ±2 ±3 %Vo — — — — — — — — — — 300 93 90 87 84 81 78 35 70 ±100 20 350 — — — — — — — — — 32 400 — –0.1 — — 330 1,000 -40 (4) -40 — — –0.5 0.5 — — — — Open (3) +0.4 – 1.0 15,000 — +85 (5) +125 mA mA µF µF °C °C 7.8 — — 106 Hrs — 500 — G’s — 15 (6) — G’s — 23 — grams VDC %Vo %Vo mV mV % mVpp µs mV A kHz V Materials meet UL 94V-0 Notes: (1) The ISR will operate at no load with reduced specifications. (2) If the remote sense feature is not being used, connect the Remote Sense Gnd (pin 7) to GND (pin 8) for optimum output voltage accuracy. (3) The STBY* control (pin 2) has an internal pull-up and if it is left open circuit the module will operate when input power is applied. The open-circuit voltage is typically the input voltage, Vin. Refer to the application notes for other interface considerations. (4) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors. See application notes. (5) See Safe Operating Area curves or contact the factory for the appropriate derating. (6) The case pins on through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing. Input/Output Capacitors: For proper operation in all applications, the PT6725 series requires a 1,000µF input capacitor (Cin) with a minimum 1.6Arms ripple current rating. And a 330µF output capacitor (Cout) with a maximum ESR of 50mΩ at 100kHz. For transient or dynamic load applications, additional output capacitance may be necessary. The maximum allowable output capacitance is 15,000µF. For more information consult the related application note on capacitor recommendations. Input Inductor: An input filter inductor is optioinal for most applications. The inductor must be sized to handle 6.5ADC with a typical value of 1µH. For technical support and more information, see inside back cover or visit www.ti.com Typical Characteristics PT6725 Series 14-A 12V-Input Adjustable Integrated Switching Regulator Characteristic Data; Vin =12V (See Note A) Safe Operating Area; Vin =12V (See Note B) Efficiency vs Output Current PT6724, Vo =5.0V 100 90 Efficiency - % VOUT 5.0V 3.3V 2.5V 1.8V 1.5V 1.2V 80 70 60 Ambient Temperature (°C) 80 90 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 50 20 0 2 4 6 8 10 12 14 0 2 4 Iout (A) 8 10 12 14 Iout (A) Output Ripple vs Output Current PT6725, Vo =3.3V 60 90 VOUT 5.0V 3.3V 2.5V 1.8V 1.5V 1.2V 40 30 20 Ambient Temperature (°C) 80 50 Ripple - mV 6 10 70 Airflow 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 0 20 0 2 4 6 8 10 12 0 14 2 4 Iout (A) 6 8 10 12 14 Iout (A) Power Dissipation vs Output Current PT6726, Vo =2.5V 10 90 Pd - Watts VOUT 5.0V 3.3V 2.5V 1.8V 1.5V 1.2V 6 4 2 Ambient Temperature (°C) 80 8 70 Airflow 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 0 20 0 2 4 6 8 10 12 14 0 2 4 Iout (A) 6 8 10 12 14 Iout (A) PT6729, Vo =1.2V 90 Ambient Temperature (°C) 80 70 Airflow 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 20 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 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 PT6721/22 & PT6725 Series Capacitor Recommendations for the 12V-Input PT6721/22 and PT6725 Series of ISRs Input Capacitors The recommended input capacitor(s) is determined by 1.6Arms minimum ripple current rating and 1,000µF minimum capacitance. Ripple current and Equivalent Series Resistance (ESR) values are the major considerations along with temperature when selecting the proper capacitor. The tantalum capacitors listed below cannot be used on the input bus since they are not rated for 12V operation. Output Capacitors The minimum required output capacitance is 330µF with a maximum ESR less than or equal to 50mΩ. 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 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 are recommended on the output bus but only AVX TPS Series, Sprague 593D/594/595 Series, or Kemet T495/T510 Series. These capacitors are recommended 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 also 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 are 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 Vendor Part Number Panasonic FC (Radial) 35V 25V 25V 680 1000 1000 0.043Ω 0.038Ω 0.038Ω 1655mA 1655mA 1690mA 12.5×20 12.5×20 16×15 2 1 1 1 2 1 EEUFC1V681 EEUFC1E102 EEUFC1E102S FC/FK (Surface Mount) 50V 25V 35V 1000 1000 470 0073Ω 0.038Ω 0.043Ω 1610mA 2000mA 1690mA 16×16.5 18×16.5 16×16.5 1 1 2 1 1 1 EEVFK1H102M EEVFC1E102N EEVFC1V471N United Chemi-con LXV Series 35V 35V 16V 680 1000 470 0.034Ω 0.038Ω 0.084Ω÷2 =0.042Ω 1690mA 1630mA 825mA (×2) 12.5×25 16×20 10×16 2 1 2 1 1 1 LXV35VB680M12X25LL LXV35VB102M16X20LL LXV16VB471M10X16LL Nichicon PL Series 35V 25V 680 1200 0.036Ω 0.039Ω 1660mA 1600mA 12.5×25 18×15 2 1 1 1 UPL1V681MHH UPL1E122MHH6 1 1 UPM1V102MHH6 1 1 10SS330M (Vo <5V) 10SV330 (Vo <5V) PM Series 35V 1000 0.034Ω 1770mA 16×20 Os-con: SS SV (surface Mount) 10V 10V 330 330 0.025Ω 0.020Ω 3500mA 3800mA 10×10.5 10.3×10.3 AVX Tantalum TPS (Surface Mount) 10V 10V 330 330 0.1Ω÷2 =0.05Ω 0.06Ω÷2 =0.03Ω >2500mA >3000mA 7.3L ×5.7W ×4.1H N/R(1) N/R(1) 2 2 TPSE337M010R0100 TPSV337M010R0060 Kemet Tantalum T510/T495 Series (Surface Mount) 10V 10V 330 220 0.033Ω 0.07Ω÷2 =0.035Ω 1400mA >2000mA 4.3W ×7.3L ×4.0H N/R(1) N/R(1) 1 2 510X337M010AS T495X227M0100AS Sprague Tantalum 594D Series (Surface Mount) 10V 330 0.045Ω 2360mA 7.2L ×6W ×4.1H N/R(1) 1 594D337X0010R2T Note: (N/R -Not recommended) The 10V-rated tantalum capacitors cannot be used on the input bus. For technical support and more information, see inside back cover or visit www.ti.com N/R(1) N/R(1) Application Notes PT6725 Series Using the Standby Function of the PT6725 Series of Integrated Switching Regulators The PT6725 series of power modules are high efficiency regulators that operate off a +12V input bus voltage. These regulators incorporate an on/off ‘Standby’ function, which may be used to disable the regulator output. Figure 1 The standby function is provided by the STBY* control, pin 2. If pin 2 is left open-circuit the regulator operates normally, and provides a regulated output when a valid supply voltage is applied to Vin (pins 4–6) with respect to GND (pins 8–12). If a low voltage 3 is then applied to pin 2 the regulator output will be disabled and the input current drawn by the ISR will be reduced to 0.5mA 1. The standby control may also be used to hold-off the regulator output during the period that input power is applied. +Vin Pin 2 is ideally controlled with an open-collector (or open-drain) discrete transistor (See Figure 1). The opencircuit voltage is typcially the input voltage Vin. Table 1 gives the circuit parameters for this control input. Table 1 Standby Control Requirements (2, 3) Parameter Min Typ Input Low (V IL ) –0.1V Max +0.4V Istby (pin 2 =ground) — –0.5mA — Vstby (open circuit) — Vin — Notes: 1. When the regulator output is disabled the current drawn from the +Vin input source is typically reduced to 0.5mA. 2 The standby control input requires no external pull-up resistor. The open-circuit voltage of the STBY* pin is approximately th input voltage V in (+12V). 2 STBY* 4–6 PT6725 V IN GND 8–12 Vo(adj) 1 V OUT 13–16 Vout Sense(–) 7 + + CIN C OUT Q1 BSS138 STBY GND GND Turn-On Time: In the circuit of Figure 1, turning Q1 on applies a low voltage to the STBY control (pin 2) and disables the regulator ouput. Correspondingly, turning Q1 off removes the low-voltage signal and enables the output. Once enabled, the output will typically experience a 10–15ms delay followed by a predictable ramp-up of voltage. The regulator should provide a fully regulated output voltage within 30ms. Figure 2 shows the output voltage response, Vo, of a PT6726 (2.5V) following the turn-off of Q 1. The turn-off of Q1 corresponds to the rise in V stby. The waveform was measured with a 12Vdc input voltage, and 9.3ADC resistive load. Figure 2 3. The standby control input is Not compatible with TTL devices that incorporate a totem-pole output drive. Use only a true open-collector device, preferably a discrete bipolar transistor (or MOSFET). To ensure the regulator output is disabled, the control pin must be pulled to less than 0.4Vdc with a low-level 0.5mA sink to ground. 4. After Q1 in Figure 1 is turned off and before the output begins to rise, the regulator output will 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. 17 Sense(+) Vo (1V/Div) Vstby (10V/Div) HORIZ SCALE: 5ms/Div For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT6725 Series Adjusting the Output Voltage of the PT6725 Series of Integrated Switching Regulators The PT6725 series of ISRs are non-programmable versions of the PT6721/2 Excalibur™ regulators. The regulators have a fixed output voltage, which may be adjusted higher or lower than the factory pre-set voltage using a single external resistor. Table 1 gives the adjustment range for each model in the series as Va (min) and Va (max). Figure 1 4,5,6 +5V 2 17 Stby* Sns(+) Vin Vout PT6725 GND 8–12 Vo(adj) 1 13–16 Vo Sns(-) 7 (R1) Adj Down + Adjust Down: Add a resistor (R1), between pin 1 (Vo Adjust) and pin 17 (Remote Sense Vout). + Cin Adjust Up: An increase in the output voltage is obtained by adding a resistor R2, between pin 1 (Vo Adjust) and pin 7 (Remote Sense GND). Cout R2 Adjust Up L O A D COM COM Refer to Figure 1 and Table 2 for both the placement and value of the required resistor, either (R1) or R2 as appropriate. The values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. (R1) = Ro ( Va –Vr ) Vo – Va R2 = Ro ·Vr Va – V o Where: Vo Va Vr Ro Rs – Rs – Rs kΩ kΩ = Original output voltage = Adjusted output voltage = The reference voltage (Table 1) = The multiplier resistance (Table 1) = The internal series resistance (Table 1) For technical support and more information, see inside back cover or visit www.ti.com Notes: 1. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the regulator as possible. 2. Never connect capacitors from Vo Adjust to either GND, Vout, or the Remote Sense pins. Adding capacitance to the Vo Adjust pin will affect the stability of the ISR. 3. If the Remote Sense feature is not being used, pin 7 must be connected to pin 8 for optimum output voltage accuracy. The resistors (R1) and R2 may then be connected from ‘Vo Adjust’ to either Vout or GND respectively. Application Notes continued PT6705/PT6715 Series Table 1 ADJUSTMENT AND FORMULA PARAMETERS Series Pt # Vo (nom) Va (min) Va (max) Vr (V) Ω) Ro (kΩ Ω) Rs (kΩ PT6729 PT6728 PT6727 PT6726 PT6725 PT6724 1.2 1.09 1.52 0.8 10.0 24.9 1.5 1.47 1.73 1.27 10.2 49.9 1.8 1.75 2.0 1.27 10.0 49.9 2.5 2.25 2.85 1.27 10.0 33.2 3.3 2.75 3.75 1.27 10.0 24.9 5.0 4.01 5.47 1.27 9.09 24.9 Table 2 ADJUSTMENT RESISTOR VALUES Series Pt # Vo (nom) Va (req’d) 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.47 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 R1 = (Blue) PT6729 1.2V PT6728 1.5V PT6727 1.8V PT6726 2.5V (5.1)kΩ (45.1)kΩ 135.0kΩ 55.1kΩ 28.4kΩ 15.1kΩ 7.1kΩ 4.7kΩ 1.8kΩ (18.1)kΩ 209.0kΩ 79.6kΩ 36.5kΩ 14.9kΩ (46.1)kΩ 204.0kΩ 77.1kΩ 34.8kΩ 13.6kΩ (6.0)kΩ (18.3)kΩ (38.8)kΩ (79.8)kΩ (203.0)kΩ 221.0kΩ 93.8kΩ 51.5kΩ 30.3kΩ 17.6kΩ 9.1kΩ 3.1k Series Pt # Vo (nom) Va (req’d) PT6725 3.3V 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 · 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 (2.0)kΩ (5.7)kΩ (10.2)kΩ (15.9)kΩ (23.1)kΩ (32.8)kΩ (46.3)kΩ (66.6)kΩ (100.0)kΩ (168.0)kΩ (371.0)kΩ PT6724 5.0 229.0kΩ 102.0kΩ 59.8kΩ 38.6kΩ 25.9kΩ 17.4kΩ 11.4kΩ 6.9kΩ 3.3kΩ (3.7)kΩ (8.4)kΩ (14.4)kΩ (22.5)kΩ (33.8)kΩ (50.8)kΩ (79.0)kΩ (136.0)kΩ (305.0)kΩ 90.5kΩ 32.8kΩ 13.6kΩ 4.0kΩ R2 = Black For technical support and more information, see inside back cover or visit www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (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. 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