PT6930 Series 8-A 5V-Input Dual-Output Integrated Switching Regulator SLTS062B (Revised 7/20/2001) Features Description • Dual Outputs: The PT6930 Excalibur™ series of 8-A dual-output ISRs are designed to power DSP ICs. Both output voltages are independently adjustable with external resistors. The second output may also be set to an alternate lower bus voltage with a simple pin strap. Internal power sequencing of both outputs, during both power-up and power-down, meets the requirements of most DSP chipsets. +3.3V/2.5V +3.3V/1.5V +3.3V/1.8V • • • • • • • Adjustable Output Voltages Remote Sense (both outputs) Standby Function Over-Temperature Protection Soft-Start Internal Sequencing 23-pin Excalibur™ Package Pin-Out Information Standard Application Vo2 Sense Vo1 Sense STBY 3 V IN 4,5,6 22 1 PT6930 16 C1 Pin Function 1 Vo1 Sense 13 Vo1 2 No Connect 14 Vo1 3 STBY 15 Vo1 4 V IN 16 Vo1 Adjust PT6931o = +3.3 Volts +2.5/1.8 Volts PT6932o = +3.3 Volts +1.5/1.2 Volts PT6933o = +3.3 Volts +1.8/1.2 Volts 18-21 Vo2 5 V IN 17 No Connect 12-15 Vo1 6 V IN 18 Vo2 7 GND 19 Vo2 PT Series Suffix (PT1234X) 8 GND 20 Vo2 9 GND 21 Vo2 10 GND 22 Vo2 Sense 11 GND 23 Vo2 Adjust* 12 Vo1 Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount + 7-11 Ordering Information Pin Function 23 + C3 C2 GND GND C 1/C 2 =Req’d 330µF electrolytic (See table footnotes) C 3 =Optional 100µF electrolytic N A C (For dimensions and PC board layout, see Package Styles 1320 and 1330). * Note:Vo1 & Vo2 Adjust can be pin-strapped to an alternative lower bus voltage. Consult the voltage adjustment application note for more information. Specifications PT6930 SERIES Characteristics (Ta= 25°C unless noted) Symbols Output Current Io1, Io2 Conditions Ta = +60°C, 200 LFM, pkg N Ta = +25°C, natural convection Min Vo1 =3.3V Vo2 =2.5V Vo2 =1.8V Vo2 =1.5V Vo1 =1.2V 0.1 0 0 0 0 (1) Vo1 =3.3V Vo2 =2.5V Vo2 =1.8V Vo2 =1.5V Vo1 =1.2V 0.1 0 0 0 0 (1) Max Units — — — — — Typ 5.5 (2) 2.2 (2) 1.75 (2) 1.45 (2) 1.2 (2) A — — — — — 6.0 (2) 2.2 (2) 1.75 (2) 1.45 (2) 1.2 (2) A A Input Voltage Range V in 0.1A ≤ Io ≤ Ityp 4.5 — 5.5 V Output Voltage Tolerance ∆V o Vin = +5V, Io =Ityp, both outputs 0°C ≤ T a ≤ +65°C Vo-0.1 — Vo+0.1 V Line Regulation Regline 4.5V ≤ Vin ≤ 5.5V, Io =Ityp Vo1 Vo2 — — ±7 ±7 ±17 ±13 V Load Regulation Regload Vin = +5V, 0.1 ≤ Io ≤ Ityp Vo1 Vo2 — — ±17 ±4 ±33 ±10 mV Vo Ripple/Noise Vn Vin = +5V, Io =Ityp Vo1 Vo2 — — 50 25 — — mV Transient Response with C2 = 330µF ttr V os Io step between 0.5xItyp and Ityp Vo over/undershoot Vo1 Vo2 — — — 25 60 60 — — — µSec Efficiency η Vin = +5V, Io =4A total — 75 — % Switching Frequency ƒo 4.5V ≤ Vin ≤5.5V 0.1A ≤ Io ≤ Ityp 475 600 725 mV kHz (Continued) For technical support and more information, see inside back cover or visit www.ti.com PT6930 Series 8-A 5V-Input Dual-Output Integrated Switching Regulator Specifications (From previous page) PT6930 SERIES Characteristics (Ta= 25°C unless noted) Symbols Conditions Min Typ Max Units +85 (4) °C Absolute Maximum Operating Temperature Range Ta — Storage Temperature Ts — -40 — +125 °C Weight — Vertical/Horizontal — 29 — grams — -40 (3) Notes: (1) Iomin current of 0.1A can be divided btween both outputs; Vo1, or Vo2. The ISR will operate down to no-load with reduced specifications. (2) Iomax listed for each output assumes the maximum current drawn simultaneously on both outputs. Consult the factory for the absolute maximum. (3) For operating temperatures below 0°C, use tantalum type capacitors at both the input and output. (4) See Safe Operating Area curves for appropriate derating. Input/Output Capacitors: The PT6930 series requires a minimumm capacitance of 330µF at both the input and Vo1 output for proper operation in all applications. In addition, the input capacitor, C1, must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic dynamic loads, additional capacitance may be required. T Y P I C A L PT6930 Series Performance 90 C H A R A C T E R I S T I C S Safe Operating Area @VIN =5V (See Note A) Total Efficiency vs Io1; Io2 =Io2(max) 90.0 (See Note B) PT6931 (Io2 fixed at 2.2A) Efficiency - % PT6931 PT6932 PT6933 70 60 Ambient Temperature (°C) 80.0 80 VOUT 70.0 200LFM 120LFM 60LFM Nat conv 60.0 50.0 40.0 30.0 50 20.0 0 1 2 3 4 5 6 0.0 Io1 (A) [ Io2 fixed at Io2(max) ] 1.0 2.0 3.0 4.0 5.0 6.0 Io1 (A) [ Io2 fixed at 2.2A ] Vo1 Ripple vs Io1; Io2 =Io2(max) 50 Ripple - mV 40 30 PT6931 PT6932 PT6933 20 10 0 0 1 2 3 4 5 6 Io1(A) [ Io2 fixed at Io2(max) ] Total Power Dissipation vs Io1; Io2 =Io2(max) 7 6 Pd - Watts 5 4 PT6931 PT6932 PT6933 3 2 1 0 0 1 2 3 4 5 6 Io1 (A) [ Io2 fixed at Io2(max) ] Note A: All characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: SOA curves represent operating conditions at which internal components are at or below the manufactuer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT6920/PT6930 Series Adjusting the Output Voltage of the PT6920 and PT6930 Dual Output Voltage ISRs Each output voltage from the PT6920 and PT6930 series of ISRs can be independantly adjusted higher or lower than the factory trimmed pre-set voltage. Vo1 or Vo2 may each be adjusted either up or down using a single external resistor 2. Table 1 gives the adjustment range for both Vo1 and Vo2 for each model in the series as Va(min) and Va(max). Note that Vo2 must always be lower than Vo1 3. Vo1 Adjust Up: To increase the output, add a resistor R4 between pin 16 (V1 Adjust) and pins 7-11 (GND) 2. 5. If Vo1 is increased above 3.3V, the minimum input voltage to the ISR must also be increased. The minimum required input voltage must be (Vo1 + 1.2)V or 4.5V, whichever is greater. Do not exceed 5.5V 6. Never connect capacitors to either the Vo1 Adjust or Vo2 Adjust pins. Any capacitance added to these control pins will affect the stability of the respective regulated output. 7. Adjusting either voltage (Vo1 or Vo2) may increase the power dissipation in the regulator, and correspondingly change the maximum current available at either output. Consult the factory for application assistance. The adjust up and adjust down resistor values can also be calculated using the following formulas. Be sure to select the correct formula parameter from Table 1 for the output and model being adjusted. Vo1 Adjust Down: Add a resistor (R3), between pin 16 (Vo1 Adjust) and pin 1 (Vo1 Sense) 2. Vo2 Adjust Up: Add a resistor R2 between pin 23 (Vo2 Adjust) and pins 7-11 (GND) 2. Vo2 Adjust Down: Add a resistor (R1) between pin 23 (Vo2 Adjust) and pin 22 (Vo2 Sense) 2. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor. (R1) or (R3) = Ro (Va – Vr) – Rs Vo – Va kΩ R2 or R4 = Vr . Ro Va – Vo kΩ Where: Vo Va Vr Ro Rs Notes: 1. The output voltages, Vo1 and Vo2, may be adjusted independantly. 2. Use only a single 1% resistor in either the (R3) or R4 location to adjust Vo1, and in the (R1) or R2 location to adjust Vo2. Place the resistor as close to the ISR as possible. 3. Vo2 must always be at least 0.2V lower than Vo1. 4. Vo2 on both the PT6921 and PT6931 models may be adjusted from 2.5V to 1.8V by simply connecting pin 22 (Vo2 Sense) to pin 23 (Vo2 Adjust). For more details, consult the data sheet. – Rs = Original output voltage, (Vo1 or Vo2) = Adjusted output voltage = The reference voltage from Table 1 = The resistance value from Table 1 = The series resistance from Table 1 Table 1 PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS Output Bus Series Pt # Standard Case Excalibur Case Adj. Resistor Vo1 Vo2 PT6921/22 PT6931/32 (R3)/R4 PT6921 PT6931 (R1)/R2 PT6922 PT6932 (R1)/R2 PT6933 (R1)/R2 Vo(nom) 3.3V 2.5V 1.5V 1.8V Va(min) 2.3V 1.8V 1.2V 1.2V Va(max) 3.6V 3.0V 3.0V 3.0V Vr 1.02V 1.0V 1.0V 1.0V Ω) Ro (kΩ 12.1 10.0 9.76 Ω) Rs (kΩ 12.1 11.5 6.49 Figure 1 22 V 2 (sns) V 2 out 4,5,6 Vin 1 V 1 (sns) V 1 out STBY 3 + 18 - 21 V 2o 12 - 15 V 1o PT6920 Vin GND 7 - 11 Vo 2 (adj) Vo 1 (adj) 23 16 (R3) Adj Down (R1) C1 + C2 R4 Adjust Up + C3 L O A D L O A D R2 COM CO Adjust V1out For technical support and more information, see inside back cover or visit www.ti.com Adjust V2out 10.0 3.32 Application Notes continued PT6920/PT6930 Series Table 2 PT6920/PT6930 ADJUSTMENT RESISTOR VALUES Output Bus Series Pt# Standard Case Excalibur Case Adj Resistor Vo(nom) Vo1 Vo2 PT6921/6922 PT6931/6932 (R3)/R4 3.3Vdc PT6921 PT6931 (R1)/R2 2.5Vdc Va(req’d) 1.2 PT6922 PT6932 (R1)/R2 1.5Vdc PT6933 (R1)/R2 1.8Vdc (0.0)kΩ (0.0)kΩ 1.25 (3.3)kΩ (1.2)kΩ 1.3 (8.2)kΩ (2.7)kΩ 1.35 (16.3)kΩ (4.5)kΩ 1.4 (32.6)kΩ (6.7)kΩ 1.45 (81.4)kΩ 1.5 (9.5)kΩ (13.3)kΩ 1.55 189.0kΩ (18.7)kΩ 1.6 91.1kΩ (26.7)kΩ 1.65 58.6kΩ (40.0)kΩ 1.7 42.3kΩ (66.7)kΩ 1.75 32.6kΩ (147.0)kΩ 1.8 (0.0)kΩ 26.0kΩ 1.85 (1.6)kΩ 21.4kΩ 197.0kΩ 1.9 (3.5)kΩ 17.9kΩ 96.7kΩ 1.95 (5.8)kΩ 15.2kΩ 63.3kΩ 2.0 (8.5)kΩ 13.0kΩ 46.7kΩ 2.05 (11.8)kΩ 11.3kΩ 36.7kΩ 2.1 (16.0)kΩ 9.8kΩ 30.0kΩ 2.15 (21.4)kΩ 8.5kΩ 25.3kΩ 2.2 (28.5)kΩ 7.5kΩ 21.7kΩ 2.25 (38.5)kΩ 6.5kΩ 18.9kΩ 2.3 (3.4)kΩ (53.5)kΩ 5.7kΩ 16.7kΩ 2.35 (4.8)kΩ (78.5)kΩ 5.0kΩ 14.9kΩ 2.4 (6.5)kΩ (129.0)kΩ 4.4kΩ 13.3kΩ 2.45 (8.3)kΩ (279.0)kΩ 3.8kΩ 12.1kΩ 2.5 (10.3)kΩ 3.3kΩ 11.0kΩ 2.55 (12.6)kΩ 189.0kΩ 2.8kΩ 10.0kΩ 2.6 (15.2)kΩ 88.5kΩ 2.4kΩ 9.2kΩ 2.65 (18.2)kΩ 55.2kΩ 2.0kΩ 8.4kΩ 2.7 (21.8)kΩ See Note 3 38.5kΩ 1.6kΩ 7.8kΩ 2.75 (26.0)kΩ 28.5kΩ 1.3kΩ 7.2kΩ 2.8 (31.0)kΩ 21.8kΩ 1.0kΩ 6.7kΩ 2.85 (37.1)kΩ 17.1kΩ 0.7kΩ 6.2kΩ 2.9 (44.8)kΩ 13.5kΩ 0.5kΩ 5.8kΩ 2.95 (54.6)kΩ 10.7kΩ 0.2kΩ 5.4kΩ 3.0 (67.8)kΩ 8.5kΩ 0.0kΩ 5.0kΩ 3.05 (86.2)kΩ 3.1 (114.0)kΩ 3.15 (160.0)kΩ 3.2 (252.0)kΩ 3.25 (528.0)kΩ 3.3 3.4 111.0kΩ See Note 5 3.5 49.6kΩ 3.6 29.0kΩ R1/R3 = (Blue) R2/R4 = Black For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT6920/PT6930 Series Using the Standby Function on the PT6920 and PT6930 Dual Output Voltage Converters Figure 1 22 Both output voltages of the 23-pin PT6920/6930 dual output converter may be disabled using the regulator’s standby function. This function may be used in applications that require power-up/shutdown sequencing, or wherever there is a requirement to control the output voltage On/ Off status with external circuitry. The standby function is provided by the STBY* control (pin 3). If pin 3 is left open-circuit the regulator operates normally, and provides a regulated output at both Vo1 (pins 12–15) and Vo2 (pins 18–21) whenever a valid supply voltage is applied to Vin (pins 4, 5, & 6) with respect to GND (pins 7–11). If a low voltage 2 is then applied to pin 3, both regulator outputs will be simultaneously disabled and the input current drawn by the ISR will typcially drop to less than 30mA (50mA max). The standby control may also be used to hold-off both regulator outputs during the period that input power is applied. The standby pin is ideally controlled using an open-collector (or open-drain) discrete transistor (See Figure 1). It may also be driven directly from a dedicated TTL3 compatible gate. Table 1 provides details of the threshold requirements. Table 1 Inhibit Control Thresholds 2,3 Parameter Min Max Enable (VIH) Disable (VIL) 1.8V Vin –0.1V 0.8V Notes: 1. The Standby/Inhibit control logic is similar for all Power Trends’ modules, but the flexibility and threshold tolerances will be different. For specific information on this function for other regulator models, consult the applicable application note. V 2 (sns) 1 V 1 (sns) V 2 out 4,5,6 V in V 1 out STBY 3 + 18 - 21 V 2 out 12 - 15 V 1 out PT6921 Vin GND Vo 2 (adj) 7 - 11 23 V 0 1 (adj) 16 C1 + C2 COM + C3 COM Q1 BSS138 Inhibit +5V V in Turn-On Time: Turning Q1 in Figure 1 off removes the lowvoltage signal at pin 3 and enables both outputs from the PT6920/6930 regulator. Following a delay of about 10–20ms, Vo 1 and Vo2 rise together until the lower voltage, Vo2, reaches its set output. Vo1 then continues to rise until both outputs reach full regulation voltage. The total power-up time is less than 25ms, and is relatively independant of load, temperature, and output capacitance. Figure 2 shows waveforms of the output voltages Vo1 and Vo2, for a PT6931 (3.3V/2.5V). The turn-off of Q1 corresponds to the rise in Vstby. The waveforms were measured with a 5Vdc input voltage, and with resistive loads of 5A and 2A at the Vo1 and Vo2 outputs respectively. Figure 2 2. The Standby control pin is ideally controlled using an open-collector (or open-drain) discrete transistor and requires no external pull-up resistor. To disable the regulator output, the control pin must be pulled to less than 0.8Vdc with a low-level 0.5mA sink to ground. 3. The Standby input on the PT6920/6930 series may be driven by a differential output device, making it directly compatible with TTL logic. The control input has an internal pull-up to the input voltage Vin. A voltage of 1.8V or greater ensures that the regulator is enabled. Do not use devices that can drive the Standby control input above 5.5V or Vin. For technical support and more information, see inside back cover or visit www.ti.com Vo1 (3.3V) Vo2 (2.5V) Vstby Ch1 1V/Div Ch2 1V/Div Timebase: 5ms/Div Ch3 5V/Div Application Notes continued PT6920/PT6930 Series Capacitor Recommendations for the Dual-Output PT6920/30 Regulator Series 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. Output Capacitors: C2(Required), C3(Optional) The ESR of the required capacitor (C2) 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. The optional 100µF capacitor (C3) for Vo2 can have an ESR of up to 200mΩ for optimum performance and ripple reduction. (Note: Vendor part numbers for the optional capacitor, C3, are not identified in the table. Use the same series selected for C2) Tantalum Capacitors Tantalum type capacitors can be used for the output but only the AVX TPS series, Sprague 593D/594/595 series or Kemet T495/T510 series. The AVX TPS series, Kemet or Sprague series tantalums are recommended over many other 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 a less reliable when compared to the AVX TPS series when determining power dissipation capability. Tantalum types are recommended for applications where ambient temperatures fall below 0°C. 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. 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 Capac i t or Vendor/ C o mp o n e n t 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 Vendor Number Panasonic FC 25V 35V 35V 560µF 390µF 330µF 0.0065W 0.065W 0.117W 1205mA 1205mA 555mA 12.5x15 12.5x15 8x11.5 1 2 (a) 1 1 1 EEUFC1E561S EEUFC1V391S EEUFC1C331 United Chemi -con LXV/FS/ LXZ 16V 35V 10V 20V 330µF 470µF 330µF 150µF 0.120W 0.052W 0.025W 0.030/2W 555mA 1220mA 3500mA 3200mA 8x12 10x20 10x10.5 10x10.5 (a) 1 1 2 1 1 (N/R) (N/R) LXZ16VB331M8X12LL LXZ35VB471M10X20LL 10FS330M 20FS150M Nichicon PL PM 35V 35V 50V 560µF 330µF 470µF 0.048W 0.065/2W 0.046W 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 0.043W 0.065W 0.150W 1205mA 1205mA 670mA 12x16.5 12.5x16 10x10.2 1 1 (a) 1 1 1 EEVFC1A102LQ EEVFC1V331LQ EEVFC1C331P Oscon- SS SV 10V 10V 20V 330µF 330µF 150µF 0.025W 0.025W 0.024/2W >3500mA >3800mA 3600mA 10.0x10.5 10.3x10.3 10.3x10.3 1 1 2 (N/R) (N/R) (N/R) 10SS330M 10SV300M 20SV150M SV= Surface Mount 10V 10V 10V 330µF 330µF 220µF 0.100/2W 0.100/2W 0.095W >2500mA >3000mA >2000mA 7.3Lx 4.3Wx 4.1H 2 2 2 1 1 2 TPSV337M010R0100 TPSV337M010R0060 TPSV227M0105R0100 Kemet T510 T495 10V 10V 330µF 220µF 0.033W 0.070W/2=0.035W 1400mA >2000mA 7.3Lx5.7W x 4.0H 2 2 1 2 T510X337M010AS T495X227M010AS Sprague 594D 10V 10V 330µF 220µF 0.0450W 0.065W 2350mA >2000mA 7.3Lx 6.0Wx 4.1H 2 2 1 2 4D337X0010R2T 594D227X0010D2T AVX Tantalum TPS (a) -Not recommended. The maximum ripple current rating of these capacitors does not meet the operating limits. (N/R) -Oscon Type Capcitors are not recommended for this application due to extremely low equivatlent series resistance (ESR) 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