PT6520 Series 8-A 5-V/3.3-V Input Adjustable ISR with Short-Circuit protection SLTS104A (Revised 1/25/2002) Features • • • • • • • • • 8A Rated Output Current Single Device: 3.3V/5V Input High Efficiency (92% for PT6521) Small Footprint (0.75 in², Suffix ‘P’) Output On/Off Standby Control Output Short-Circuit Protection Adjustable Output Voltage Soft Startup 16-pin Mount Option (Suffixes L, M, Q, & F) Ordering Information Description These power modules are a series of high performance, 8-A rated, Integrated Switching Regulators (ISRs), housed in a low cost 14-Pin SIP (Single In-line Package). Operating from either a 3.3V or 5V standard power bus, the PT6520 series produces a high-output, low-voltage power source for the industry’s latest high-speed, microprocessors, ASICs, & DSPs. This allows for the easy integration of these new low-voltage ICs into existing 3.3V or 5V systems without re-designing the power supply. The PT6520 series features an output On/Off standby pin and output shortcircuit protection. † † † † † PT6521¨ PT6522¨ PT6523¨ PT6525¨ PT6526¨ PT6527¨ = = = = = = 3.3 Volts 1.5 Volts 2.5 Volts 2.1 Volts 1.8 Volts 1.2 Volts Note: Back surface of product is electrically conductive PT6520 † 3.3V Input Bus Capable PT Series Suffix (PT1234x ) Case/Pin Configuration Pin-Out Information Order Suffix Package Code * P D E M L Q F R G B (EED) (EEA) (EEC) (EEM) (EEL) (EEQ) (EEF) (EEE) (EEG) (EEK) Vertical Horizontal SMD Horizontal, 2-Pin Tab SMD, 2-Pin Tab Horizontal, 2-Pin Ext Tab SMD, 2-Pin Ext Tab Vertical, Side Tab Horizontal, Side Tab SMD, Side Tab Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 * Previously known as package styles 400/410. (Reference the applicable package code drawing for the dimensions and PC board layout) Function Remote Sense Do Not Connect STBY* Vin Vin Vin GND GND GND GND Vout Vout Vout Vout Adjust * For further information, see application notes. Standard Application VoADJ VoSENSE 14 VIN 4,5,6 + 1 PT6520 3 7–10 CIN COM For technical support and more information, see inside back cover or visit www.ti.com VOUT 11,12,13 + COUT LOAD COM PT6520 Series 8-A 5-V/3.3-V Input Adjustable ISR with Short-Circuit protection Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, Cin =330µF, Cout =330µF, and Io =Iomax) Characteristic Symbol Output Current Input Voltage Range Io Vin Set Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Voltage Variation Vo tol Regtemp Regline Regload ∆Votot Efficiency η Conditions Min Over Vin range Over Io Range Vo =3.3V Vo ≤2.5V –40° ≤Ta ≤ +85°C, Io =Iomin Over Vin range Over Io range Includes set-point, line, load, –40° ≤Ta ≤ +85°C Io =3.0A Io =8.0A Vo Ripple (pk-pk) Transient Response Short Circuit Threshold Switching Frequency Remote On/Off (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 Mil-Std-883D, 20-2000Hz Weight — Flammability — — 20MHz bandwidth 1A/µs load step, 50% to 100% Iomax Vo over/undershoot Over Vin and Io range Referenced to –Vin (pin 7) pins 3 & 7 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 Suffixes P, D, & E Suffixes L & M Suffixes P, D, & E Suffixes R, G & B Suffixes L & M Suffixes Q & F Materials meet UL 94V-0 Vo =3.3V Vo =2.5V Vo =2.1V Vo =1.8V Vo =1.5V Vo =1.2V Vo =3.3V Vo =2.5V Vo =2.1V Vo =1.8V Vo =1.5V Vo =1.2V PT6520 SERIES Typ Max Units 0.1 (1) 4.5 3.1 — — — — — — — ±1 ±0.5 ±5 ±5 8.0 5.5 5.5 ±1.5 — ±10 ±10 A — ±2 ±3 — — — — — — — — — — — — — — — — 300 92 88 85 82 80 75 89 85 82 78 75 71 35 50 ±70 12 350 — — — — — — — — — — — — — — — 22.5 400 — –0.1 — — 330 330 -40 -40 — — –0.5 15 — — — — Open (2) +0.4 – 25 5,000 — +85 (3) +125 mA mA µF µF °C °C 6.3 — — 106 Hrs — 500 — G’s — — — — — — 7.5 TBD (4) 12.5 16.5 15.25 22 — — — — — — G’s VDC %Vo %Vo mV mV %Vo % % mVpp µs mV A kHz V grams Notes: (1) The ISR will operate at no load with reduced specifications. (2) The STBY* control (pin 3) 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 12.6V, and maybe as high as 15V. Refer to the application notes for other interface considerations. (3) See Safe Operating Area curves or contact the factory for the appropriate derating. (4) The tab pins on the 16-pin mount package types (suffixes L & M) must be soldered. For more information see the applicable package outline drawing. Input/Output Capacitors: The PT6520 series requires a 330µF capacitor at both the input and output for proper operation in all applications. In addition, the input capacitance (Cin) must be rated for a minimum of 1.2Arms ripple current rating. For transient or dynamic load applications, additional output capacitance (Cout) may be necessary. The maximum allowable output capacitance is 5,000µF. 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 PT6520 Series 8-A 5-V/3.3-V Input Adjustable ISR with Short-Circuit protection Characteristic Data; Vin =5.0V Characteristic Data; Vin =3.3V (See Note A) Efficiency vs Output Current (See Note A) Efficiency vs Output Current 100 100 90 90 Efficiency - % 80 3.3V 2.5V 1.8V 1.2V 70 60 Efficiency - % VOUT 50 VOUT 80 2.5V 1.8V 1.2V 70 60 50 40 40 0 1 2 3 4 5 6 7 8 0 1 2 3 Iout (A) Output Ripple vs Output Current 5 6 7 8 Output Ripple vs Output Current 40 40 35 35 30 30 VOUT 25 3.3V 2.5V 1.8V 1.2V 20 15 VOUT Ripple - mV Ripple - mV 4 Iout (A) 25 2.5V 1.8V 1.2V 20 15 10 10 5 5 0 0 0 1 2 3 4 5 6 7 0 8 1 2 3 Iout (A) 4 5 6 7 8 Iout (A) Power Dissipation vs Output Current Power Dissipation Output Current 5 5 4 4 1.2V 1.8V 2.5V 3.3V 3 2 VOUT Pd - Watts Pd - Watts VOUT 3 1.2V 1.8V 2.5V 2 1 1 0 0 0 1 2 3 4 5 6 7 0 8 1 2 3 Safe Operating Area; Vin =5V (See Note B) 5 6 7 8 Safe Operating Area; 3.3V (See Note B) 90 90 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 Ambient Temperature (°C) 80 Ambient Temperature (°C) 4 Iout (A) Iout (A) 70 Airflow 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 20 0 1 2 3 4 5 6 7 8 Iout (A) 0 1 2 3 4 5 6 7 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 8 Application Notes PT6520 Series Using the Standby Function of the PT6520 Series of Integrated Switching Regulators The PT6520 series of power modules are high efficiency regulators that operate off either a 3.3V or 5V input bus voltage. These regulators incorporate a Standby function, which may be used in applications that require power-up/shutdown sequencing, and wherever there is a requirement for the output status of the module to be controlled by external circuitry. Figure 1 1 Vo(sense) 4,5,6 V in STBY + 3 C in The standby function is provided by the STBY* control, pin 3. If pin 3 is left open-circuit 1 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 7–10). If a low voltage 2 is then applied to pin 3 the regulator output will be disabled and the input current drawn by the ISR will be reduced to about 15mA 3. The standby control may also be used to hold-off the regulator output during the period that input power is applied. Pin 3 is ideally controlled with an open-collector (or opendrain) discrete transistor (See Figure 1). The open-circuit voltage is typcially 12.6V. Table 1 gives the circuit parameters for this control input. Table 1 Standby Control Requirements (2, 3) Parameter Min Typ Input Low (V IL ) Istby (pin 3 =ground) Vstby (open circuit) –0.1V Max +0.4V –0.5mA 12.6V PT6520 Vin GND 7,8,9,10 Vo 11,12,13 Vo Vo(adj) + 14 Cout COM COM Inhibit Q1 BSS138 Turn-On Time: In the circuit of Figure 1, turning Q1 on applies a low voltage to the STBY control (pin 3) 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 40ms. The waveform of Figure 2 shows the output voltage and input current waveforms of a PT6521 (3.3V) following the turn-off of Q1. The turn off of Q1 corresponds to the rise in Vstby. The waveforms were measured with a 5Vdc input voltage, and 4.5A resistive load. 15V Notes: 1 The standby control input requires no external pull-up resistor. The open-circuit voltage of the STBY* pin is typically 12.6V. Figure 2 Vo (1V/Div) 2. The standby control input is Not compatible with TTL or other 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. Iin (2A/Div) Vstby (10V/Div) 3. When the regulator output is disabled the current drawn from the input source is typically reduced to 15mA. HORIZ SCALE: 5ms/Div For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT6520 Series Adjusting the Output Voltage of the PT6520 Series of Integrated Switching Regulators Figure 1 The output voltage of the PT6520 series of integrated switching regulators (ISRs) may be adjusted higher or lower than the factory trimmed pre-set voltage with the addition of a single external resistor. 1 Table 1 gives the allowable adjustment range for each model in the series as Va (min) and Va (max). 1 Vo(sense) 4,5,6 Vin PT6520 Vin STBY 3 + GND 7,8,9,10 Vout 11,12,13 14 (R1) Adj Down C in Adjust Up: An increase in the output voltage is obtained by adding a resistor R2, between pin 14 (Vo adjust) and pins 7-10 (GND). Vo Vo(adj) + C out L O A D R2 Adj Up COM COM Adjust Down: Add a resistor (R1), between pin 14 (Vo adjust) and pin 1 Vo(sense) 3. 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 – Vo Where: Vo Va Vr Ro Rs – Rs – Rs kΩ 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. 2. Never connect capacitors from Vo adjust to either GND, Vout, or the Remote Sense pin. Capacitance added to the Vo adjust pin will affect the stability of the ISR. 3. If the Remote Sense feature is not being used, the resistor (R1) may be connected between pin 14 (Vo adjust) and pins 11–13 (Vout). kΩ = Original output voltage = Adjusted output voltage = The reference voltage (Table 1) = The multiplier resistance (Table 1) = The internal series resistance (Table 1) 4. Adjusting the output voltage of the PT6523 (2.5V model) higher than the factory pre-trimmed output voltage may increase the minimum input voltage specified for the part. This model must comply with the following requirements. PT6523: Vin(min) = (Va + 0.5)V or 3.1V, whichever is greater. Table 1 ADJUSTMENT AND FORMULA PARAMETERS Series Pt # Vo (nom) Va (min) Va (max) Vr (V) Ω) Ro (kΩ Ω) Rs (kΩ PT6527 PT6522 PT6526 PT6525 PT6523 PT6521 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 2.05 1.27 10.0 49.9 2.1 1.95 2.45 1.27 10.0 33.2 2.5 2.25 2.85 1.27 10.0 33.2 3.3 2.75 3.75 1.27 10.0 24.9 For technical support and more information, see inside back cover or visit www.ti.com Application Notes continued PT6520 Series Table 2 PT6520 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) PT6527 1.2V PT6522 1.5V PT6526 1.8V PT6525 2.1V PT6523 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 (12.1)kΩ (39.8)kΩ (123.0)kΩ 221.kΩ 93.8kΩ 51.5kΩ 30.3kΩ 17.6kΩ 9.1kΩ 3.1kΩ Series Pt # Vo (nom) Va (req’d) PT6521 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 (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 229.0kΩ 102.0kΩ 59.8kΩ 38.6kΩ 25.9kΩ 17.4kΩ 11.4kΩ 6.9kΩ 3.3kΩ (6.0)kΩ (18.3)kΩ (38.8)kΩ (79.8)kΩ (203.0)kΩ 221.0kΩ 93.8kΩ (See Note 4) 51.5kΩ 30.3kΩ 17.6kΩ 9.1kΩ 3.1kΩ R2 = Black For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT6520 Series Capacitor Recommendations for the PT6520 Series of Integrated Switching Regulators Tantalum Capacitors Tantalum type capacitors may be used for the output 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 higher rated surge, power dissipation, and ripple current capability. 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 than the AVX TPS series when determining power dissipation capability. Tantalum or Oscon® types are recommended for applications where ambient temperatures fall below 0°C. Input Capacitors: The recommended input capacitance is determined by 1.0 ampere minimum ripple current rating and 330µF minimum capacitance (300µF for Oscon® or low ESR tantalum). Ripple current and <100mΩ equivalent series resistance (ESR) values are the major considerations, along with temperature, when designing with different types of capacitors. Tantalum capacitors have a recommended minimum voltage rating of 2× the maximum DC voltage + AC ripple. This is necessary to insure reliability for input voltage bus applications Capacitor Table Table 1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The number of capacitors required at both the input and output buses is identified for each capacitor type. Output Capacitors: The ESR of the required capacitor (Cout) must not be greater than 150mΩ. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz but excellent low frequency transient response. Above the ripple frequency, ceramic 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. 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 25V 35V 35V 560µF 390µF 330µF 0.0065Ω 0.065Ω 0.117Ω 1205mA 1205mA 555mA 12.5x15 12.5x15 8x11.5 1 2 N/R 1 1 1 EEUFC1E561S EEUFC1V391S EEUFC1C331 United Chemi-Con LXV/FS/ LXZ 16V 35V 10V 20V 330µF 470µF 330µF 150µF 0.120Ω 0.052Ω 0.025Ω 0.030÷2 Ω 555mA 1220mA 3500mA 3200mA 8x12 10x20 10x10.5 10x10.5 N/R 1 1 2 1 1 1 2 LXZ16VB331M8X12LL LXZ35VB471M10X20LL 10FS330M 20FS150M Nichicon PL/ PM 35V 35V 50V 560µF 330µF 470µF 0.048Ω 0.065÷2 Ω 0.046Ω 1360mA 1020mA 1470mA 16x15 12.5x15 18x15 1 1 1 1 1 1 UPL1V561MHH6 UPL1V331MHH6 UPM1H4711MHH6 Panasonic FC (Surface Mtg) 10V 35V 16V 1000µF 330µF 330µF 0.043Ω 0.065Ω 0.150Ω 1205mA 1205mA 670mA 12x16.5 12.5x16 10x10.2 1 1 N/R 1 1 1 EEVFC1A102LQ EEVFC1V331LQ EEVFC1C331P Oscon- SS SV 10V 10V 20V 330µF 330µF 150µF 0.025Ω 0.025Ω 0.024÷2 Ω >3500mA >3800mA 3600mA 10.0x10.5 10.3x10.3 10.3x10.3 1 1 2 1 1 2 10SS330M 10SV300M 20SV150M SV= Surface Mount AVX Tantalum TPS 10V 10V 10V 330µF 330µF 220µF 0.100÷2 Ω 0.100÷2 Ω 0.095Ω >2500mA >3000mA >2000mA 7.3Lx 4.3Wx 4.1H 2 2 2 1 1 2 TPSV337M010R0100 TPSV337M010R0060 TPSV227M0105R0100 10V 10V 330µF 220µF 0.033Ω 0.07Ω÷2 =0.035Ω 1400mA >2000mA 7.3Lx5.7W x 4.0H 2 2 1 2 T510X337M010AS T495X227M010AS 10V 10V 330µF 220µF 0.045Ω 0.065Ω 2350mA >2000mA 7.3Lx 6.0Wx 4.1H 2 2 1 2 4D337X0010R2T 594D227X0010D2T Kemet T510/ T495 Sprague 594D N/R –Not recommended. The ripple current rating and ESR does not meet the requirements. For technical support and more information, see inside back cover or visit www.ti.com Vendor Number 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. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. 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