PT6440 Series 6-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator SLTS133B Revised (1/30/2002) Features • 6A Output Current • Input Voltage Range: 3.1 V to 5.5 V • 90% Efficiency • Adjustable Output Voltage • Standby Function • Short Circuit Protection • Small Footprint (0.61 in2) • Solderable Copper Case • 8.8 106 Hours MTBF Description Ordering Information The PT6440 Excalibur™ power modules are a series of high performance Integrated Switching Regulators (ISRs), housed in a thermally efficient solderable copper case. These modules operate from input voltages as low as 3.1V to produce a high-output lowvoltage power source; ideal for powering the industry’s latest DSP and microprocessors. The series includes standard output bus voltages as low as 1.0VDC. The innovative copper case construction provides superior thermal performance in a small footprint. Both through-hole and surface mount pin configurations are available. The PT6440 series operating features include external output voltage adjustment, an On/Off inhibit, and short-circuit protection. A 100µF input, and 330µF output capacitor are required for proper operation. PT6441H PT6442H PT6443H PT6444H PT6445H PT6446H PT6447H † † † † † † = = = = = = = 3.3 2.5 2.0 1.8 1.5 1.2 1.0 Pin-Out Information Volts Volts Volts Volts Volts Volts Volts Pin † 3.3V Input Bus Capable PT Series Suffix (PT1234x ) Case/Pin Configuration Order Suffix Package Code * N A C Vertical Horizontal SMD (EPH) (EPJ) (EPK) 1 2 3 4 5 6 7 8 9 10 11 12 Function Inhibit * Vin Vin Vin GND GND GND GND Vout Vout Vout Vout Adj * * For further information, see application notes. * Previously known as package styles 1540/50. (Reference the applicable package code drawing for the dimensions and PC board layout) Standard Application V O (ADJ) 12 + V IN 2,3,4 + C IN PT6440 1 5,6,7,8 + V OUT 9,10,11 + C OUT INH GND GND Cin = Required 100µF electrolytic Cout = Required 330µF electrolytic For technical support and more information, see inside back cover or visit www.ti.com PT6440 Series 6-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, Cin =100µF, Cout =330µF, and Io =Iomax) Characteristic Symbol Output Current Io Input Voltage Range Vin Set Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Voltage Variation Vo tol Regtemp Regline Regload ∆Votot Efficiency η Vo Ripple (pk-pk) Transient Response Short Circuit Threshold Switching Frequency Inhibit (Pin 1) 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 =4A 20MHz bandwidth 5A/µs load step, 50% to 100% Iomax Vo over/undershoot Over Vin and Io range Referenced to –Vin (pin 8) pins 1 & 5 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 = 3.3V Vo ≤ 2.5V Vo =3.3V Vo =2.5V Vo =2.0V Vo =1.8V Vo =1.5V Vo =1.2V Vo =1.0V PT6440 SERIES Typ Max Units 0.1 (1) 0.1 (1) 4.5 3.1 — — — — — — — — ±1 ±0.5 ±6 ±10 6 6 5.5 5.5 ±2 (2) — ±10 ±25 %Vo %Vo mV mV — ±2 ±3 %Vo — — — — — — — — — — — 300 91 89 85 85 81 80 78 20 50 ±70 10 350 — — — — — — — — — — — 400 Vin–0.5 –0.2 — — 330 100 –40 (3) –40 — — –0.5 +0.5 — — — — Open (2) +0.5 – — 1,000 — +85 (4) +125 mA mA µF µF °C °C 8.8 — — 106 Hrs — 500 — G’s — 20 (5) — G’s — 23 — grams A VDC % mVpp µs mV A kHz V Materials meet UL 94V-0 Notes: (1) The ISR will operate at no load with reduced specifications. (2) The Inhibit control (pin 1) 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 the input voltage V in. Use a discrete MOSFET to control the Inhibit pin, and ensure a transitioin time of less than ≤ 10µs. Consult the related application note for other interface considerations. (3) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors. (4) See Safe Operating Area curves or contact the factory for the appropriate derating. (5) The case pins on through-hole package types (suffixes N & A) must be soldered. For more information consult the applicable package outline drawing. Input/Output Capacitors: The PT6440 regulator series requires a 100µF electrolytic (or tantalum) capacitor at the input and 330µF at the output for proper operation in all applications. In addition, the input capacitance, C in, must be rated for a minimum of 350mArms of ripple current, and the ESR of the output capacitor, Cout , must less than 100mΩ @100kHz. For transient or dynamic load applications additional output capacitance may be necessary. For more information consult the related application note on capacitor recommendations. For technical support and more information, see inside back cover or visit www.ti.com Typical Characteristics PT6440 Series 6-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator PT6440 Series Performance; @VIN =5.0V (See Note A) PT6440 Series Performance; @VIN =3.3V Efficiency Vs Output Current Efficiency Vs Output Current 100 100 90 PT6441 PT6442 PT6443 PT6444 PT6445 PT6446 PT6447 80 70 Efficiency - % Efficiency - % 90 PT6442 PT6443 PT6444 PT6445 PT6446 PT6447 80 70 60 60 50 50 0 1 2 3 4 5 6 0 1 2 Iout (A) 5 6 60 50 PT6446 PT6443 PT6444 PT6442 PT6445 PT6441 PT6447 40 30 20 Ripple - mV 50 Ripple - mV 4 Ripple Vs Output Current Ripple Vs Output Current PT6446 PT6447 PT6445 PT6444 PT6443 PT6442 40 30 20 10 10 0 0 0 1 2 3 4 5 0 6 1 2 3 4 5 6 Iout (A) Iout (A) Power Dissipation Vs Output Current Power Disspiation Vs Output Current 2.5 2.5 2 2 PT6441/2 PT6443/4 PT6445/6 PT6447 1.5 1 Pd - Watts Pd - Watts 3 Iout (A) 60 0.5 1.5 PT6442/3/4 PT6445/6 PT6447 1 0.5 0 0 0 1 2 3 4 5 6 0 1 2 Iout (A) 3 4 5 6 Iout (A) Safe Operating Area Curves Safe Operating Area Curves (See Note B) PT6440 Series, VIN =5.0V (See Note B) PT6440 Series, VIN =3.3V 90.0 90.0 80.0 80.0 70.0 Airflow 200LFM 120LFM 60LFM Nat conv 60.0 50.0 40.0 30.0 Ambient Temperature (°C) Ambient Temperature (°C) (See Note A) 70.0 Airflow 200LFM 120LFM 60LFM Nat conv 60.0 50.0 40.0 30.0 20.0 20.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Iout (A) 0.0 1.0 2.0 3.0 4.0 5.0 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 6.0 Application Notes PT6440 Series Capacitor Recommendations for the PT6440 Excalibur™ 5V/3.3V Bus Step-Down ISRs Tanatalum Capacitors The recommended input capacitance is determined by 350 milli-amperes (rms) minimum ripple current rating and 100µF minimum capacitance. Capacitors placed at the input must be rated for a minimum of twice the input voltage with +5V operation. Ripple current and ≤200mΩ Equivalent Series Resistance (ESR) values are the major considerations, along with temperature, when selecting the proper input capacitor. Tantalum capacitors are recommended on the output bus but only the AVX TPS series, Sprague 593D/594/595 series or Kemet T495/T510 series. These capacitors are specified over many other types due to their higher surge current, power dissipation and ripple current capability. As a caution, the TAJ Series by AVX is not recommended. This series exhibits considerably higher ESR and lower ripple current capability. The TAJ series is also less reliable than the TPS series when determining power dissipation capability. Tantalum or Oscon® types are recommended in applications where ambient temperatures fall below 0°C. Output Capacitors Capacitor Table The ESR of the required 330µF output capacitor must be 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 300kHz 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. The preferred low ESR type capacitor part numbers are identified in Table 1. Table 1 identifies vendors with acceptable ESR and maximum allowable ripple current (rms) ratings. The suggested minimum quantities per regulator for both the input and output buses are identified. Input Capacitors 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 critical parameters necessary to insure both optimum regulator performance and long capacitor life. Table 1; Input/Output Capacitors Capacitor Vendor/ Component Series Capacitor Characteristics Quantity Working Voltage Value(µF) (ESR) Equivalent Series Resistance 85°C Maximum Ripple Current(Irms) Physical Size(mm) Input Bus Output Bus Panasonic, FC (Radial) 35V 35V 25V 390µF 100µF 330µF 0.065Ω 0.117Ω 0.090Ω 1205mA 555mA 755mA 12.5×15 8×11.5 10×12.5 1 1 1 1 N/R 1 EEUFC1V391S EEUFC1V101 EEUFC1E331 FC (Surface Mount) 16V 25V 35V 220µF 100µF 330µF 0.15Ω÷2 0.40Ω 0.065Ω 670mA 450mA 1205mA 10×10.2 8×10.2 12×16.5 1 1 1 2 N/R 1 EEVFC1C221P EEVFC1101P EEVFC1V471LQ United Chemi-Con LXV/LXZ 25V 35V 330µF 220µF 0.084Ω 0.090Ω÷2 825mA 760mA 10×16 10×12.5 1 1 1 2 FS 10V 10V 330µF 100µF 0.025Ω 0.040Ω 3500mA 2100mA 10×10.5 6.3×9.8 1 1 1 N/R Vendor Number LXV25VB331M10X16LL LXZ35VB221M10X12LL 10FS330M 10FS100M Nichicon, PL (Radial) 35V 330µF 0.065Ω 1020mA 12.5×15 1 1 UPL1V331MHH6 UD (Surface Mount) 35V 35V 330µF 220µF 0.090Ω 0.17Ω÷2 670mA 450mA 10×10 8×10 1 1 1 2 UUD1V331MNR1GS UUD1V2211MNR1GS Oscon, SS (Radial) 10V 330µF 0.025Ω >3500mA 10×10.5 1 1 10SS330M SV (Surface Mount) 10V 16V 330µF 100µF 0.025Ω 0.045Ω >3800mA 2200mA 10.3×10.3 10.3×10.3 1 1 1 N/R 10SV300M 16SV100M AVX Tantalum TPS 10V 10V 10V 330µF 330µF 150µF 0.100Ω 0.060Ω 0.100Ω 1414mA 1826mA 1095mA 7.3L ×4.3W ×4.1H 1 1 1 1 1 2 TPSV337M010R0100 TPSV337M010R0060 TPSD107M010R100 Kemet, T510 T495 10V 10V 330µF 220µF 0.033Ω 0.070Ω÷2 1400mA >2000mA 7.3L ×5.7W ×4.0H 1 1 1 2 T510X337M010AS T495X227M010AS Sprague 594D 10V 10V 330µF 150µF 0.045Ω 0.090Ω 2350mA 1100mA 7.3L ×6W ×4.1H 1 1 1 2 594D337X0010R2T 594D157X0010C2T For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT6440 Series Adjusting the Output Voltage of the PT6440 Excalibur 5V/3.3V Bus Step-Down ISRs The output voltage of the PT6440 Series ISRs may be adjusted higher or lower than the factory trimmed preset voltage with the addition of a single external resistor. Table 1 gives the allowable adjustment range for each model for either series as Va (min) and Va (max). The values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor; either (R1) or R2 as appropriate. Ro (Va – 0.9) Vo – Va (R1) = Adjust Up: An increase in the output voltage is obtained by adding a resistor R2, between Vo Adj (pin 12) and GND (pins 5–8). R2 = Adjust Down: Add a resistor (R1), between Vo Adj (pin 12) and Vout (pins 9–11). Where: Vo Va Ro Rs Figure 1 0.9 Ro Va – Vo – Rs kΩ – Rs kΩ = Original output voltage = Adjusted output voltage = The resistance value from Table 1 = The series resistance from Table 1 Notes: 1. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the ISR as possible. +V IN 2,3,4 Vin PT6440 GND 5–8 Vo +V O 9,10,11 Vo(adj) 12 (R1) Adj Down + 3. For each model, adjustments to the output voltage may place additional limits on the minimum input voltage. The revised minimum input voltage must comply with the following requirement. + C1 C2 R2 Adjust Up COM 2. Never connect capacitors from Vo adj to either GND or Vout. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. COM Vin(min) = (Va + 0.5)V or as specified in the data sheet, whichever is greater. Table 1 ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt. # PT6441 PT6442 PT6443 PT6444 PT6445 PT6446 Vo (nom) 3.3 2.5 2.0 1.8 1.5 1.2 1.0 Va (min) 2.88 1.97 1.64 1.5 1.3 1.08 0.97 2.95 2.45 2.25 Va (max) 3.5 Ω) Ro (kΩ 10.0 10.0 10.0 10.0 10.0 10.0 10.2 Rs (kΩ) 49.9 20.0 20.0 20.0 20.0 20.0 20.0 For technical support and more information, see inside back cover or visit www.ti.com 1.95 1.65 PT6447 1.45 Application Notes continued PT6440 Series Table 2 ISR ADJUSTMENT RESISTOR VALUES Series Pt. # PT6441 PT6442 Vo (nom) 3.3 2.5 Va (req.d) PT6443 2.0 PT6444 1.8 PT6445 1.5 PT6446 1.2 0.97 PT6447 1.0 (0.4)kΩ 1.0 1.05 164.0kΩ 1.1 (0.0)kΩ 1.15 (30.0)kΩ 1.2 71.8kΩ 41.2kΩ 25.9kΩ 1.25 160.0kΩ 16.7kΩ 1.3 (0.0)kΩ 70.0kΩ 10.6kΩ 1.35 (10.0)kΩ 40.0kΩ 6.2kΩ 1.4 (30.0)kΩ 25.0kΩ 3.0kΩ 1.45 (90.0)kΩ 16.0kΩ 0.4kΩ 1.5 (0.0)kΩ 10.0kΩ 1.55 (6.0)kΩ 160.0kΩ 5.7kΩ 1.6 (15.0)kΩ 70.0kΩ 2.5kΩ 0.0kΩ 1.65 (1.4)kΩ (30.0)kΩ 40.0kΩ 1.7 (6.7)kΩ (60.0)kΩ 25.0kΩ 1.75 (14.0)kΩ (150.0)kΩ 1.8 (25.0)kΩ 1.85 (43.3)kΩ 160.0kΩ 5.7kΩ 1.9 (80.0)kΩ 70.0kΩ 2.5kΩ 1.95 (190.0)kΩ 40.0kΩ 0.0kΩ 2.0 (2.0)kΩ 16.0kΩ 10.0kΩ 25.0kΩ 2.05 (5.6)kΩ 160.0kΩ 16.0kΩ 2.1 (10.0)kΩ 70.0kΩ 10.0kΩ 2.15 (15.7)kΩ 40.0kΩ 5.7kΩ 2.2 (23.3)kΩ 25.0kΩ 2.5kΩ 2.25 (34.0)kΩ 16.0kΩ 0.0kΩ 2.3 (50.0)kΩ 10.0kΩ 2.35 (76.7)kΩ 5.7kΩ 2.4 (130.0)kΩ 2.5kΩ 2.45 (284.0)kΩ 0.0kΩ 2.5 2.55 160.0kΩ 2.6 70.0kΩ 2.65 40.0kΩ 2.7 25.0kΩ 2.75 16.0kΩ 2.8 10.0kΩ 2.85 2.9 5.7kΩ (0.0kΩ 2.5kΩ 2.95 (8.5)kΩ 0.0kΩ 3.0 (20.1)kΩ 3.05 (36.1)kΩ 3.1 (60.1)kΩ 3.15 (100.0)kΩ 3.2 (180.0)kΩ 3.25 (420.0)kΩ 3.3 3.35 130.0kΩ 3.4 40.1kΩ 3.45 10.1kΩ 3.48 R1 = (Blue) 0.0kΩ R2 = Black For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT6440 Series Using the Inhibit Function on the PT6440 Excalibur 5V/3.3V Bus Step-Down ISRs For applications requiring output voltage On/Off control, the 12-pin PT6440 series products incorporate an Inhibit function. This function may be used wherever there is a requirement for the module to be switched off. The function is provided by the Inhibit control (pin 1) input. The ISR functions normally with pin 1 open-circuit, 1 providing a regulated output whenever a valid source voltage is applied to Vin, (pins 2–4), with respect to GND (pins 5–8). When a low-level ground signal is applied to pin 1, the regulator output is disabled. Figure 1 shows an application schematic, which details the typical use of the Inhibit function. Note the discrete transistor (Q1). The Inhibit control has its own internal pull-up to +Vin potential. An open-collector or opendrain device is required to control this pin. 2 Turn-On Time: In the circuit of Figure 1, turning Q1 on applies a low-voltage to the Inhibit control (pin 1) and disables the regulator output. Correspondingly, turning Q1 off allows the Inhibit control pin to be pulled high by its internal pull-up resistor. The ISR produces a fully regulated output voltage within 10 milliseconds of the release of the Inhibit control pin. The actual turn-on time will vary with input voltage, output load, and the total amount of load capacitance. Figure 2 shows the typical rise in both output voltage and input current for a PT6441 (3.3V) following the turn-off of Q1 at time t =0. The waveform was measured with a 5Vdc input voltage, and 6 Adc resistive load. Figure 2 The Inhibit pin control thresholds are given in Table 1. Equation 1 may be used to determine the approximate current drawn from the input source, and by Q1 when the regulator is placed in the inhibit state. Table 1; Inhibit Control Requirements Parameter Enable (VIH) Disable (VIL) Transition Time IIN (2A/Div) 3 Min Max Vin – 0.5 -0.2V Vin 0.5V 10µs VO (2V/Div) VINH (5V/Div) 4 -1 0 1 2 3 4 5 6 7 8 9 10 t (milliseconds) Equation 1; Off Input Current = Vin ÷ 10kΩ Istby Notes: 1. Use an open-collector device (preferably a discrete transistor) for the Inhibit input. A pull-up resistor is not necessary. To disable the output voltage, the control pin should be pulled low to less than +0.5VDC. ± 20% Figure 1 +5V 2,3,4 PT6442 Vin Inhibit* + 1 C in 5–8 +2.5V 9,10,11 3. Avoid capacitance greater than 500pF at the Inhibit control pin. Excessive capacitance at this pin will cause the ISR to produce a pulse on the output voltage bus at turnon. V o(adj) 12 + C out COM Inhibit GND Vo 2. Do not control the Inhibit input with an external DC voltage. This will lead to erratic operation of the ISR and may over-stress the regulator. COM Q1 BSS138 For technical support and more information, see inside back cover or visit www.ti.com 4. Keep the On/Off transition to less than 10µs. This prevents erratic operation of the ISR, which could cause the output voltage to be momentarily higher than normal. 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