PT6940 TI | Alldatasheet

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Technical content

Features

  • High Efficiency Dual Output (See Ordering Information)
  • Ideal Power Source for DSPs
  • 5V/3.3V Input
  • 6A Rated (Both Outputs)
  • Internal Power-up Sequencing
  • Single On/Off Control
  • Independent Adjust/T rim

Description

The PT6940 Excalibur™ power modules are a series of high-efficiency dual-output regulators, housed in a solderable space- saving package. The dual output is ideal for DSP applications that require a second voltage source for a processor core. Both outputs from the PT6940 regulator modules are rated to deliver a full 6A load current simultaneously, and are internally sequenced to comply with the power-up requirements of popular DSP ICs. Each output can be independently adjusted with a single external resistor, and incorporates an output sense to compensate for voltage drop between the regulator and load. A short-circuit load fault at either output will result in the coordinated shutdown of both voltages.

  • Remote Sensing (Vo 1 & Vo2)
  • Soft-Start
  • Short-Circuit Protection (coordinated shutdown)
  • 27-pin Space-Saving Package
  • Solderable Copper Case Cin = Req’d 330µF * electrolytic Co1/Co2 = Req’d 330µF * electrolytic *300µF for Oscon® or low ESR tantalum (see application notes) PT6940 Series 6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator SLTS155B Revised (4/8/2002)

Ordering Information

PT6941/G6F = +3.3/2.5 V olts PT6942/G6F = +3.3/1.8 V olts PT6943/G6F = +3.3/1.5 V olts PT6944/G6F = +3.3/1.2 V olts † PT6946/G6F = +2.5/1.8 V olts † PT6947/G6F = +2.5/1.5 V olts † PT6948/G6F = +2.5/1.2 V olts † -Denotes models that will also operate off 3.3V input bus. Pin Function

1 STBY* †

10 GND

11 GND

12 GND

13 V in

14 V in

15 V in

16 V in

18 GND

19 GND

20 GND

21 GND

22 GND

23 Vo 2

24 Vo 2

25 Vo 2

26 V o 2 Sense

27 Vo 2 Adjust

† STBY* pin: Open = Outputs enabled Ground = Outputs disabled Pin-Out Information PT Series Suffix (PT1234x) Case/Pin Order Package Configuration Suffix Code Vertical N (ENE) Horizontal A (ENF) SMD C (ENG) (Reference the applicable package code drawing for the dimensions and PC layout) PT6940 Co 1 330µF 13–16 4–6 23–25 C IN 330µF Co 2 330µF Vo1 Vo2 L O A D L O A D Vo2 Sense Vo1 Sense VIN STBY* GND GND 7–12 17–22

For technical support and more information, see inside back cover or visit www.ti.com PT6940 Series 6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator General Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, Cin =330µF , Co1 =330µF , Co2 =330µF , and Io1/Io2 =Iomax) PT6940 Series Characteristic Symbol Conditions Min Typ Max Units Output Current I o (1) Ta =25°C, natural convection 0.1 (2) —6 ATa =60°C, 200LFM airflow 0.1 (2) —6 Set Point Voltage T olerance V o tol — ±0.5 ±2 %V o T emperature Variation Reg temp –40° ≤Ta ≤ +85°C, Io =Iomin — ±0.5 — %V o Line Regulation Reg line Over Vin range — ±5 ±10 mV Load Regulation Reg load Over Io range — ±5 ±10 mV T otal Output Voltage Variation ∆Votot Includes set-point, line, load, V o =3.3V — ±43 ±100 Vo =1.8V — ±28 ±54 mV Vo =1.5V — ±25 ±45 Vo =1.2V — ±22 ±36 Efficiency η Vin =5V , Io1 = Io2 =4A PT6941 — 92 — PT6942 — 91 — PT6943 — 90 — %PT6944 — 90 — PT6946 — 89 — PT6947 — 88 — PT6948 — 87 — Vo Ripple (pk-pk) V r 20MHz bandwidth — 35 — mV pp T ransient Response t tr 1A/µs load step, 50% to 100% Iomax — 60 — µs ∆Vtr Vo over/undershoot — ±70 — mV Short Circuit Threshold I sc(pk) Reset followed by auto-recovery — 13 (3) —A Switching Frequency ƒ o Over Vin range 300 350 400 kHz STBY* (Pin 1) Referenced to GND (pin 7) Input High Voltage V IH — — Open (4) V Input Low Voltage VIL –0.1 — +0.4 Input Low Current IIL — -0.5 – mA Quiescent Current I in standby pin 1 to GND — 10 20 mA External Output Capacitance Both outputs 330 — TBD µF Operating T emperature Range T a Over Vin Range –40 (5) — +85 (6) °C Storage T emperature T s — –40 — +125 °C Mechanical Shock Per Mil-STD-883D, Method 2002.3 1 msec, ½ Sine, mounted — TBD — G’ s Mechanical Vibration Mil-STD-883D Method 2007.2, Vertical — TBD (7) — G’s20-2000 Hz Horizontal — TBD (7) — Weight — Vertical/Horizontal — 34 — grams Flammability — Meets UL 94V-O Notes: (1) The outputs, Vo1 and Vo2, have similar characteristics. The applicable performance parameters are defined according to output voltage. (2) The minimum output current applies to each output. The module will operate at no load with reduced specifications. (3) A short-circuit load fault at either output causes the module to continuously reset, affecting both outputs. (4) The STBY* 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 approximately the input voltage, Vin. Refer to the application notes for interface considerations. (5) For operating temperatures below 0°C, Cin, Co1, and Co2 must have stable characteristics. Use either tantalum or Oscon® capacitors. (6) See Safe Operating Area curves for the specific output voltage combination, or contact the factory for the appropriate derat ing. (7) Only the case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing. Input/Output Capacitors: The PT6940 series requires a 330µF electrolytic capacitor at the input and both outputs for proper operation (300µF for Oscon® or low ESR tantalum). In addition, the input capacitance must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic load applications, additional capacitance may be required. Refer to the application notes for more information.

For technical support and more information, see inside back cover or visit www.ti.com Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter. Performance Characteristics; Vin =3.3V (See Note A) Efficiency vs. Io 1 & Io2 Load Currents Power Dissipation vs. Io 1 & Io2 Load Currents Efficiency vs. Io 1 & Io2 Load Currents Power Dissipation Vs. Io 1 & Io2 Load Currents Performance Characteristics; Vin =5V (See Note A) PT6940 Series 6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator 0123456 Iout (A ) [Both Outputs] Vo1 Ripple - mV PT6946 PT6947 PT6948 PT6941 PT6942 PT6943 PT6944 0123456 Iout (A) [Both Outputs] Vo2 Ripple - mV PT6941 PT6946 PT6942 PT6947 PT6948 PT6943 PT5944 100 0123456 Iout (A) [Both Outputs ] Efficiency - % PT6946 PT6947 PT6948 0123456 Iout (A) [Both Outputs] Vo 1 Ripple - mV PT6946 PT6947 PT6948 0123456 Iout (A) [Both Outputs] Vo2 Ripple - mV PT6946 PT6947 PT6948 0123456 Iout (A) [Both Outputs] Pd - Watts 0123456 Iout (A) [Both Outputs] Pd - Watts Vo1 Ripple vs. Io 1 & Io 2 Load Currents Vo2 Ripple vs. Io 1 & Io 2 Load Currents Vo1 Ripple vs. Io 1 & Io 2 Load Currents Vo2 Ripple vs. Io 1 & Io 2 Load Currents 100 0123456 Iout (A) [Both Outputs] Efficiency - % PT6941 PT6942 PT6943 PT6944 PT6946 PT6947 PT6948

For technical support and more information, see inside back cover or visit www.ti.com Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures PT6940 Series 6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator Safe Operating Area Curves; Vin =5V (See Note B) Safe Operating Area Curves; Vin =3.3V/5V (See Note B) 0123456 Iout (A) [Both Outputs] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow PT6941 (3.3V/2.5V) PT6942 (3.3V/1.8V) PT6943 (3.3V/1.5V) PT6944 (3.3V/1.2V) 0123456 Iout (A) [Both Outputs] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow 0123456 Iout (A) [Both Outputs] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow 0123456 Iout (A) [Both Outputs] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow PT6946 (2.5V/1.8V) 0123456 Iout (A) [Both outputs] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow PT6947 (2.5V/1.5V) PT6948 (2.5V/1.2V) 0123456 Iout (A ) [Both Outputs] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow 0123456 Iout (A) [Both Outputs] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com Notes Table 1: Input/Output Capacitors N/R –Not recommended. The voltage rating does not meet the minimum operating limits. Capacitor Recommendations for the Dual-Output PT6940 Regulator Series Input Capacitor: 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 tem- perature, when designing with different types of capacitors. T antalum capacitors have a recommended minimum voltage rating of twice the maximum DC voltage + AC ripple. This is necessary to insure reliability for input voltage bus appli- cations Output Capacitors: Co 1/Co2 The ESR of the required capacitors, Co1 & Co2 must not be greater than 150m Ω . 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 T able 1. PT6940 Series Tantalum Capacitors T antalum type capacitors can 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 dissipa- tion, and lower ripple current capability. The TAJ series is less reliable than the AVX TPS series when determining power dissipation capability. T antalum or Oscon® types are recommended for applications where ambient tem- peratures fall below 0°C. Capacitor Table T able 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. roticapaC /rodneV tnenopmoC seireS scitsiretcarahCroticapaCy titnauQ gnikroW egatloV) Fµ(eulaV tnelaviuqE)RSE( ecnatsiseRseireS elppiRmumixaMC°58 )smrI(tnerruC lacisyhP )mm(eziS tupnI suB tuptuO suB rebmuNrodneV cinosanaP CF V52 V53 V53 Fµ065 Fµ093 Fµ033 5600.0 Ω 560.0 Ω 711.0 Ω Am5021 Am5021 Am555 51x5.21 51x5.21 5.11x8 R/N S165E1CFUEE S193V1CFUEE 133C1CFUEE detinU noC-imehC /SF/VXL ZXL V61 V53 V01 V02 Fµ033 Fµ074 Fµ033 Fµ051 021.0 Ω 250.0 Ω 520.0 Ω 030.0 ÷2 Ω Am555 Am0221 Am0053 Am0023 21x8 02x01 5.01x01 5.01x01 R/N LL21X8M133BV61ZXL LL02X01M174BV53ZXL M033SF01 M051SF02 nocihciN MP/LP V53 V53 V05 065F µ 033F µ 074F µ 840.0 Ω 560.0 ÷2 Ω 640.0 Ω Am0631 Am0201 Am0741 51x61 51x5.21 51x81 6HHM165V1LPU 6HHM133V1LPU 6HHM1174H1MPU cinosanaP CF )gtMecafruS( V01 V53 V61 0001F µ 033F µ 033F µ 340.0 Ω 560.0 Ω 051.0 Ω Am5021 Am5021 Am076 5.61x21 61x5.21 2.01x01 R/N QL201A1CFVEE QL133V1CFVEE P133C1CFVEE SS-nocsO VS V01 V01 V02 033F µ Fµ033 051F µ 520.0 Ω 520.0 Ω 420.0 ÷2 Ω Am0053> Am0083> Am0063 5.01x0.01 3.01x3.01 3.01x3.01 M033SS01 M003VS01 M051VS02 tnuoMecafruS=VS XVA mulatnaT SPT V01 V01 V01 Fµ033 Fµ033 Fµ022 001.0 ÷2 Ω 001.0 ÷2 Ω 590.0 Ω Am0052> Am0003> Am0002> xL3.7 xW3.4 H1.4 0010R010M733VSPT 0600R010M733VSPT 0010R5010M722VSPT temeK /015T 594T V01 V01 Fµ033 Fµ022 330.0 Ω 70.0 ÷Ω 530.0=2 Ω Am0041 Am0002> W7.5xL3.7 H0.4x SA010M733X015T SA010M722X594T eugarpS D495 V01 V01 Fµ033 Fµ022 540.0 Ω 560.0 Ω Am0532 Am0002> xL3.7 xW0.6 H1.4 T2R0100X733D4 T2D0100X722D495

For technical support and more information, see inside back cover or visit www.ti.com Adjusting the Output Voltages of the PT6940 Dual-Output ISRs Each output voltage from the PT6940 series of integrated switching regulators (ISRs) can be independently adjusted higher or lower than the factory trimmed pre-set voltage. The voltages, Vo 1 and Vo2 may each be adjusted either up or down using a single external resistor 1. T able 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 2. Vo1 Adjust Up: T o increase the output, add a resistor R2 between pin 2 (Vo1 Adjust) and pins 7-12 (GND) 3. Vo1 Adjust Down: Add a resistor (R1), between pin 2 (Vo1 Adjust) and pin 3 (Vo1 Sense). Vo2 Adjust Up: Add a resistor R4 between pin 27 (Vo2 Adjust) and pins 17–22 (GND). Vo2 Adjust Down:Add a resistor (R3) between pin 27 (Vo2 Adjust) and pin 26 (Vo2 Sense). Refer to Figure 1 and T able 2 for both the placement and value of the required resistor. 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 T able 1 for the output and model being adjusted. (R1) or (R3) = 10 (Va – 0.9 ) – Rs kΩVo – Va R2 or R4 = 9 – Rs kΩVa – Vo Figure 1 Where: V o = Original output voltage, (Vo1 or Vo2) Va = Adjusted output voltage Rs = The series resistance from T able 1 Notes: 1.Use only a single 1% resistor in either the (R1) or R2 location to adjust Vo1, and in the (R3) or R4 location to adjust Vo2. Place the resistor as close to the module as possible. 2.Vo 2 must always be at least 0.3V lower than Vo1. 3.When adjusting Vo 1 higher than the factory pre-set output voltage the minimum input voltage must be revised as follows. Vo1 =3.3V: Vin(min) = (Vo1 + 1)V or 4.5V , whichever is greater. Vo1 =2.5V: Vo1 =2.5V is the maximum output voltage allowed for operation off a 3.3V input bus. If Vo1 is adjusted above 2.5V , the input voltage must be a minimum of 4.5V . 4.Vo 1 and Vo2 may be adjusted down to an alternative bus voltage by making, (R1) or (R3) respectively, a zero ohm link. Refer to the T able 1 footnotes for guidance. 5.Never connect capacitors to either the Vo 1 Adjust or Vo2 Adjust pins. Any capacitance added to these control pins will affect the stability of the respective regulated output. PT6940 Series PT6940 Co 1 13–16 4–6 23–25 C IN Co 2 Vo 1 Vo 2 L O A D L O A D Vo 2 Sense Vo 1 Sense V IN GND GND 7–12 17–22 (R1) (R3) Vin V1 AdjV2 Adj Vo1 Vo2 V 1 Sns V 2 Sns 27 2

For technical support and more information, see inside back cover or visit www.ti.com Application Notes 1.8 (0.0) 1.85 (1.6)kΩ 1.9 (3.7)kΩ 1.95 (6.1)kΩ 2.0 (9.0)kΩ 2.05 (12.6)kΩ 2.1 (17.0)kΩ 2.15 (22.7)kΩ 2.2 (30.3)kΩ 2.25 (41.0)kΩ 2.3 (57.0)kΩ 2.35 (83.7)kΩ 2.4 (137.0)kΩ 2.45 (297.0)kΩ 2.5 (0.0)kΩ 2.8 (18.0)kΩ 2.85 (23.3)kΩ 2.9 (30.0)kΩ 2.95 (38.6)kΩ 3.0 (50.0)kΩ 3.1 (90.0)kΩ 3.2 (210.0)kΩ 3.3 3.4 70.0k Ω 3.5 25.0k Ω 3.6 10.0k Ω 3.7 2.5k Ω R1/R3 = (Blue), R2/R4 = Black # See Note 3 Vo1 Bus Series Pt # PT6941/42/43/44 PT6946/47/48 Adj. Resistor (R1)/R2 (R1)/R2 Vo(nom) 3.3V 2.5V Va(req’d) Table 1 ADJUSTMENT RANGE AND FORMULA PARAMETERS Vo1 Bus Vo 2 Bus (2) Series Pt # PT6941/42/43/44 PT6946/47/48 PT6941 PT6942/46 PT6943/47 PT6944/48 Adj. Resistor (R1)/R2 (R1)/R2 (R3)/R4 (R3)/R4 (R3)/R4 (R3)/R4 Ref. Note 4: * (R1) = Zero-ohm link †(R3) = Zero-ohm link 1.15 (20.6)kΩ 1.2 (0.0)kΩ 1.25 (4.0)kΩ 151.0kΩ 1.35 (20.0)kΩ 30.6kΩ 1.45 (100.0)kΩ 6.6kΩ 1.5 (0.0)kΩ 0.0kΩ 1.55 (6.0)kΩ 170.0kΩ 1.65 (30.0)kΩ 50.0kΩ 1.75 (150.0)kΩ 26.0kΩ 1.8 (0.0)kΩ 19.6kΩ 1.85 (1.6)kΩ 160.0kΩ 15.7kΩ 1.9 (3.7)kΩ 70.0kΩ 12.5kΩ 1.95 (6.1)kΩ 40.0kΩ 10.0kΩ 2.0 (9.0)kΩ 25.0kΩ 8.0kΩ 2.05 (12.6)kΩ 16.0kΩ 6.4kΩ 2.1 (17.0)kΩ 10.0kΩ 5.0kΩ 2.15 (22.7)kΩ 5.7kΩ 3.9kΩ 2.2 (30.3)kΩ 2.5kΩ 2.9kΩ 2.3 (57.0)kΩ 1.3kΩ 2.45 (297.0)kΩ 2.5 2.55 167.0k Ω 2.6 77.0k Ω 2.65 47.0k Ω 2.7 32.0k Ω 2.75 23.0k Ω 2.8 17.0k Ω 2.85 12.7k Ω 2.9 9.5k Ω 2.95 7.0kΩ 3.0 5.0k Ω 3.1 2.0k Ω Vo2 Bus Series Pt # PT6941 PT6942/46 PT6943/47 PT6944/48 Adj. Resistor (R3)/R4 (R3)/R4 (R3)/R4 (R3)/R4 Vo(nom) 2.5V 1.8V 1.5V 1.2V Va(req’d) Table 2 ADJUSTMENT RESISTOR VALUES PT6940 Series

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