PT5400 Series 6-A 5-V/3.3-V Input Adjustable SWIFT™ Power Module SLTS169C - MAY 2002 - REVISED OCTOBER 2003 Features • • • • • • Fully Functional SWIFT Module Single-Device: 5 V/3.3 V Input DSP Compatible No Output Capacitors Required High Efficiency (93 % at 4 A) Small Footprint (0.355 in², Suffix ‘N’) • Adjustable Output Voltage Description • • • • • On/Off Inhibit Function Short Circuit Protection Thermal Shutdown Space-Saving package Solderable Copper Case Ordering Information The PT5400 Excalibur™ power modules are a series of high-performance integrated switching regulators (ISRs) based on TI’s SWIFT (Switcher With Integrated FET Technology) regulator ICs. These ready-to-use modules are rated for up to 6 A of output current from input voltages as low as 3.1 V, providing a convenient step-down power source for the industry’s latest high-performance DSPs and microprocessors. The series includes output voltage options as low as 1.0 VDC. The PT5400 modules are packaged in a 5-pin thermally efficient copper case, which offers the advantage of solderability along with a small footprint (0.355 in², suffix ‘N’). Both through-hole and surface mount pin configurations are available. The product features external output voltage adjustment, an on/off inhibit function, short circuit protection, and thermal shutdown. A 100-µF input capacitor is required for proper operation. ! ! ! ! ! ! ! ! ! ! ! ! ! Pin-Out Information Pin Function Input Bus 5 V 3.3 V Pt No. PT5401H PT5402H PT5408H PT5403H PT5404H PT5405H PT5406H PT5407H Vout 1 Inhibit * 3.3 Volts 2.5 Volts 2.5 Volts 2.0 Volts 1.8 Volts 1.5 Volts 1.2 Volts 1.0 Volts 2 Vin 3 4 GND Vo 5 Vo Adjust * For Inhibit pin: Open = output enabled Ground = output disabled PT Series Suffix (PT1234x ) Case/Pin Configuration Order Suffix N A C Vertical Horizontal SMD Package Code (EFK) (EFL) (EFM) (Reference the applicable package code drawing for the dimensions and PC board layout) Standard Application VOADJ INH 1 + V IN 2 C1 (Required) GND + 5 PT5400 3 +VO 4 C2 + (Optional) GND C1 = Required 100 µF C2 = Optional 100 µF For technical support and further information, visit http://power.ti.com PT5400 Series 6-A 5-V/3.3-V Input Adjustable SWIFT™ Power Module SLTS169C - MAY 2002 - REVISED OCTOBER 2003 Environmental Specifications Characteristics Symbols Conditions Min Operating Temperature Range Over-Temperature Shutdown Storage Temperature Solder Reflow Temperature Mechanical Shock Ta OTP Ts Treflow Over Vin range internal junction temp, auto-reset — Measured on any part of module Mil-STD-883D, Method 2002.3 Half Sine, mounted to a fixture Mil-STD-883D, Method 2007.2, 20-2000 Hz, PCB mounted — Materials meet UL 94V-0 –40 — –40 — — Mechanical Vibration Weight Flammability Notes: (i) (ii) (iii) — — Vertical Horizontal PT5400 Series Typ (i) — — Max Units — 150 — — 500 85 — 125 215 (ii) — °C °C °C °C G’s 20 (iii) 6.5 — — G’s grams For operation below 0 °C the external capacitors must have stable characteristics. Use either a low ESR tantalum or Oscon® capacitor. During solder reflow of SMD package version, do not elevate the case, pin, or internal component temperatures above the stated maximum. For further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051). The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing. Electrical Specifications (Except PT5408) Unless otherwise stated, T a =25 °C, V in =5 V, C1 =100 µF, C2 =0 µF, and I o =I omax Characteristics Symbols Conditions Output Current Io Input Voltage Range Vin Vin =5 V Vin =3.3 V Over Io range Set-Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Variation Vo tol ∆Regtemp ∆Regline ∆Regload ∆Regtot Efficiency η Vo Ripple (pk-pk) Transient Response Vr Current Limit Threshold Output Voltage Adjust Switching Frequency Under-Voltage Lockout ttr ∆Vtr Ilim Vo adj ƒs UVLO Inhibit Control (pin1) Input High Voltage Input Low Voltage Input Low Current VIH VIL IIL Standby Input Current External Input Capacitance External Output Capacitance Reliability Iin standby C1 C2 MTBF PT5400 Series (Except PT5408) Min Typ Max Vo ≥ 2.5 V Vo ≤ 2.0 V –40 °C <Ta < +85 °C Over Vin range Over Io range Includes set-point, line, load, –40 °C ≤ T a ≤ +85 °C PT5401 (3.3 V) Vin =5 V, Io =4 A PT5402 (2.5 V) PT5403 (2.0 V) PT5404 (1.8 V) PT5405 (1.5 V) PT5406 (1.2 V) PT5407 (1.0 V) Vin =3.3 V, Io =4 A PT5403 (2.0 V) PT5404 (1.8 V) PT5405 (1.5 V) PT5406 (1.2 V) PT5407 (1.0 V) 20 MHz bandwidth 1 A/µs load step, 50 to 100 % I omax, C2 =100 µF Recovery time V o over/undershoot ∆Vo = –50 mV Over Vin and Io ranges Vin increasing Vin decreasing Referenced to GND (pin3) Pin 1 to GND pins 1 & 3 connected Per Bellcore TR-332 50 % stress, Ta =40 °C, ground benign — — — Units 0 0 4.5 3.1 — — — — — ±0.5 ±5 ±10 6 5.5 5.5 5.5 ±2 — — — — — ±3 — — — — — — — — — — — — — 93 91 88 87 85 82 80 88 86 84 81 78 15 — — — — — — — — — — — — mVpp — — — — — — — 50 50 12 ±10 700 2.95 2.8 — — — — — — — µSec mV A % kHz Vin –0.5 –0.2 — — 100 (3) 0 — — –10 1 — 100 Open (2) 0.8 — — — 1,000 V 48 — — 106 Hrs (4) (1) (1) A V %Vo %Vo mV mV %Vo % % V µA mA µF µF Notes: (1) See SOA curves or consult factory for the appropriate derating. (2) The Inhibit control (pin 1) has an internal pull-up, and if left open-circuit the module will operate when input power is applied. A small low-leakage (<100 nA) MOSFET is recommended to control this input. See application notes for more information. (3) The regulator requires a minimum of 100 µF input capacitor with a minimum 300 mArms ripple current rating. For further information, consult the related application note on Capacitor Recommendations. (4) An external output capacitor is not required for basic operation. Adding 100 µF of distributed capacitance at the load will improve the transient response. For technical support and further information, visit http://power.ti.com Typical Characteristics PT5400 Series 6-A 5-V/3.3-V Input Adjustable SWIFT™ Power Module SLTS169C - MAY 2002 - REVISED OCTOBER 2003 Typical Characteristics (Except PT5408) Performance Data; Vin =5 V (See Note A) Performance Data; Vin =3.3 V (See Note A) Efficiency vs Output Current Efficiency vs Output Current 100 100 90 PT5401 PT5402 PT5403 PT5404 PT5405 PT5406 PT5407 80 70 60 Efficiency - % Efficiency - % 90 50 80 PT5403 PT5404 PT5405 PT5406 PT5407 70 60 50 40 40 0 1 2 3 4 5 6 0 1 2 Iout (A) Output Ripple vs Output Current 40 PT5403 PT5404 PT5405 PT5401 PT5406 PT5407 PT5402 30 20 Ripple - mV Ripple - mV 5 50 40 10 PT5405 PT5403 PT5404 PT5406 PT5407 30 20 10 0 0 0 1 2 3 4 5 6 0 1 2 Iout (A) 3 4 5 Iout (A) Power Dissipation vs Output Current Power Dissipation vs Output Current 2.5 2.5 2.0 2.0 Pd - Watts Pd - Watts 4 Output Ripple vs Output Current 50 1.5 1.0 1.5 1.0 0.5 0.5 0.0 0.0 0 1 2 3 4 5 0 6 1 2 3 4 5 Iout (A) Iout (A) Safe Operating Curve, Vin =5 V (See Note B) Safe Operating Curve, Vin =3.3 V (See Note B) 90 90 80 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 Ambient Temperature (°C) Ambient Temperature (°C) 3 Iout (A) Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 20 0 1 2 3 4 5 6 Iout (A) 0 1 2 3 4 5 Iout (A) Note A: Characteristic data 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 manufacturer’s maximum rated operating temperatures. For technical support and further information, visit http://power.ti.com PT5408 6-A 5-V/3.3-V Input Adjustable SWIFT™ Power Module SLTS169C - MAY 2002 - REVISED OCTOBER 2003 Electrical Specifications (PT5408 only) Unless otherwise stated, T a =25 °C, V in =3.3 V, C1 =100 µF, C2 =0 µF, and Io =I omax Characteristics Symbols Conditions Min Output Current Input Voltage Range Set-Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Variation Io Vin Vo tol ∆Regtemp ∆Regline ∆Regload ∆Regtot Vin =3.3 V Over Io range 0 3.1 — — — — Efficiency Vo Ripple (pk-pk) Transient Response η Vr Current Limit Threshold Output Voltage Adjust Switching Frequency Under-Voltage Lockout ttr ∆Vtr Ilim Vo adj ƒs UVLO Inhibit Control (pin1) Input High Voltage Input Low Voltage Input Low Current VIH VIL IIL Standby Input Current External Input Capacitance External Output Capacitance Reliability Iin standby C1 C2 MTBF –40 °C <Ta < +85 °C Over Vin range Over Io range Includes set-point, line, load, –40 °C ≤ T a ≤ +85 °C Io =4 A 20 MHz bandwidth 1 A/µs load step, 50 to 100 % I omax, C2 =100 µF Recovery time V o over/undershoot ∆Vo = –50 mV PT5408 Typ Max Units — ±0.5 ±5 ±10 6 (1) 3.6 ±2 — — — %Vo %Vo mV mV — — — ±3 %Vo — — 92 15 — mVpp — — — — — — — 50 50 13 ±10 700 2.95 2.8 — — — — — — — µSec mV A % kHz — — –10 1 — 100 Open (2) 0.8 — — — 1,000 V Pin 1 to GND pins 1 & 3 connected Vin –0.5 –0.2 — — 100 (3) 0 Per Bellcore TR-332 50 % stress, Ta =40 °C, ground benign 48 — — 106 Hrs Over Vin and Io ranges Vin increasing Vin decreasing Referenced to GND (pin3) (4) V µA mA µF µF Notes: (1) See SOA curves or consult factory for the appropriate derating. (2) The Inhibit control (pin 1) has an internal pull-up, and if left open-circuit the module will operate when input power is applied. A small low-leakage (<100 nA) MOSFET is recommended to control this input. See application notes for more information. (3) The regulator requires a minimum of 100 µF input capacitor with a minimum 300 mArms ripple current rating. For further information, consult the related application note on Capacitor Recommendations. (4) An external output capacitor is not required for basic operation. Adding 100 µF of distributed capacitance at the load will improve the transient response. For technical support and further information, visit http://power.ti.com Typical Characteristics PT5408 6-A 5-V/3.3-V Input Adjustable SWIFT™ Power Module SLTS169C - MAY 2002 - REVISED OCTOBER 2003 Typical Characteristics (PT5408 only) 100 Power Dissipation vs Output Current (See Note A) Efficiency vs Output Current, Vin =3.3 V (See Note A) 2 1.6 Pd - Watts Efficiency - % 90 80 70 60 1.2 0.8 0.4 50 0 0 1 2 3 4 5 6 0 1 2 3 Iout (A) 40 4 5 6 Iout (A) Safe Operating Curve, V in =3.3 V (See Note B) Output Ripple vs Output Current (See Note A) 90 Ambient Temperature (°C) 80 Ripple - mV 30 20 10 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 0 20 0 1 2 3 4 5 Iout (A) 6 0 1 2 3 4 5 6 Iout (A) Note A: Characteristic data 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 manufacturer’s maximum rated operating temperatures. For technical support and further information, visit http://power.ti.com Application Notes PT5400 Series Operating Features of the PT5400 SWIFT™ Series of Power Modules Under-Voltage Lockout (UVLO) The PT5400 SWIFT series of power modules incorporate an under-voltage lockout (UVLO) function. The UVLO function provides a clean transition during powerup and power-down, allowing the regulator to tolerate a slowly rising input voltage. The UVLO prevents operation of the module until the input voltage has risen above 2.95 V. Below this threshold the status of the inhibit control pin is overriden, and the module will not produce an output. When the input voltage rises above this threshold, the output status of the module is determined by the inhibit control pin. If the inhibit control is open-circuit (not grounded), the module will automatically power up. The UVLO circuit has approximately 0.16 V of hysteresis, and will completely turn off the module when a falling input voltage drops below about 2.8 V. (Note: Even though the applied input voltage may be above the UVLO threshold, operation to the published specifications requires that the input voltage be at or above the minimum specified for each model in the series. This ensures that the output voltage of the module is in regulation.) Soft-Start Power Up Following either the application of a valid input source voltage, or the removal of a ground signal to the inhibit control pin (with input power applied), the module will initiate a soft-start power up. The soft start has two effects on the start-up characteristic. It introduces a short time delay prior to the start-up of the output voltage, and also slows the rate at which the output voltage rises. Figure 1-1 shows the power-up characteristic of a PT5404 (1.8 V). In this example the delay time, td, is measured from the point at which the input voltage rises above 2.95 V (the UVLO threshold), to the point that the output voltage starts to rise. The time period t(SS) is the rise time of the output voltage ramp. The value of td and t(SS) are are approximately 10 ms and 7.5 ms respectively. Figure 1-1; Soft-Start Characteristic and Timing HORIZ SCALE: 5ms/Div Vin (1V/Div) Vin =2.95V Vout (1V/Div) td If desired, both time periods can be lengthened with the addition of a low value capacitor between the Inhibit control (pin 1) and the COM (pin 3). For a given value of external capacitance, Cinh, the formulas for calculating the approximate effect on td and t(SS) are given below. td ≈ (Cinh + 0.047 µF) × 1.2 V 5 µA t(SS) ≈ (Cinh + 0.047 µF) × 0.7 V 5 µA Note: The capacitor should be placed as close to the regulator as possible. Adding 0.047 µF of external capacitance to the Inhibit pin approximately doubles the value of td and t(SS). Current Limit Protection The output current limit feature is one of two fault protection mechanisms built into the PT5400 modules. Its purpose is to protect both the module and input source against the occurance of a load fault, thereby isolating the fault and preventing it from propagating to other parts of the power system. The PT5400 regulators sense the current switched by the series (high-side) power MOSFET. The circuit implements a continuous current limit characteristic. Upon the removal of the fault the output voltage will promptly recover, and the module will return to normal operation. A current limit condition will also increase the module’s power dissipation, which may cause the temperature of the internal components to significantly rise. If the condition persists, the module may begin to cycle in and out of thermal shutdown. Thermal Shutdown Thermal shutdown is the second fault protection mechanism and protects the module’s internal circuitry against excessively high temperatures. A rise in the temperature of the internal circuitry may be the result of a drop in airflow, a high ambient temperature, or a sustained overcurrent load fault. If the junction temperature of the internal components exceed 150 °C, the module will shutdown. Once in thermal shutdown, the regulator is disabled and the output voltage is reduced to zero. The recovery is automatic and begins with a soft-start power up. Recovery occurs when the the sensed temperature decreases 10 °C below the trip point. t (SS) For technical support and further information, visit http://power.ti.com Application Notes PT5400 Series Capacitor Recommendations for the PT5400 SWIFT™ Series of Power Modules Input Capacitors The recommended input capacitance is determined by 100 µF minimum capacitance, 300 mA (rms) minimum ripple current rating, and less than 300 mΩ equivalent series resistance (ESR). The ripple current rating, ESR, and operating temperature are the major considerations when selecting the input capacitor. It is recommended that tantalum capacitors have a minimum voltage rating of at least twice the working voltage, including the ac ripple. This is necessary to insure reliability with 3.3-V input voltage bus applications. Output Capacitors (optional) The ESR of the output bulk (non-ceramic) capacitance must be between 10 mΩ ≤ESR ≤200 mΩ. Electrolytic capacitors have poor ripple performance at frequencies greater than 400 kHz but excellent low frequency transient response. Above the ripple frequency, ceramic decoupling capacitors are recommended to improve the transient response and reduce any high frequency noise components apparent during higher current excursions. A maximum of 100 µF ceramic capacitance may be added to the output bus. Tantalum/ Ceramic Capacitors Tantalum capacitors are acceptable on the output bus. Tantalum, Os-con®, or ceramic capacitor types are recommended for applications where ambient temperatures fall below 0 °C. Ceramic capacitors may be used instead of electrolytic types on both the input and output bus. The input bus must have at least the minimum amount of capacitance. For the output bus the total amount of ceramic capacitance should be limited to 100 µF. Capacitor Tables Table 2-1 identifies vendors with acceptable ESR and maximum allowable ripple current (rms) ratings. Capacitors recommended for the output are identified under the Output Bus column with the required quantity. 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 (at 100 kHz) are critical parameters necessary to insure both optimum regulator performance and long capacitor life. Table 2-1; Recommended Input/Output Capacitors Capacitor Vendor/ Component Series Capacitor Characteristics Working Voltage Value (µF) (ESR) Equivalent Series Resistance Max Ripple at 85 °C Current (Irms) Quantity Physical Size (mm) Input Bus Output Bus Vendor Number Panasonic WA (SMT) 10V 120 µF 0.035 Ω 2800 mA 8.3×6.9 1 1 EEFWA1A121P Panasonic FC FK (SMT) 16 V 16 V 220 µF 330 µF 0.150 Ω 0.160 Ω 555 mA 600 mA 10×10.2 8×10.2 1 1 1 1 EEUFC1C221 EEVFK1C331P United Chemi–Con FS PXA (SMT) MVZ (SMT) PS 10 V 10 V 16 V 10 V 100 µF 120 µF 220 µF 270 µF 0.040 Ω 0.027 Ω 0.170 Ω 0.014 Ω 2100 mA 2430 mA 450 mA 4420 mA 6.3×9.8 8×6.7 8×10 8×11.5 1 1 1 1 1 1 1 1 10FS100M PXA10VC121MH80TP MVZ25VC221MH10TP 10PS270MH11 Nichicon(F55)SMTWG (SMT) PM 10V 35 V 25 V 100 µF 100µF 150 µF 0.055 Ω 0.150 Ω 0.160 Ω 2000 mA 670 mA 460 mA 7,3x4,3 10×10 10×11.5 1 1 1 1 1 1 F551A101MN UWG1V101MNR1GS UPM1E151MPH Sanyo Os-con® SVP (SMT) SP TPA 10 V 16 V 10 V 120 µF 100 µF 100 µF 0.040 Ω 0.025 Ω 0.080 Ω >2500 mA >2800 mA >1200 mA 7×8 6.3×9.8 7.3×4.8 1 1 1 1 1 1 10SVP120M 16SPS100M 10TPA100M AVX Tantalum TPS 10 V 10 V 100 µF 220 µF 0.100 Ω 0.100 Ω >1090 mA >1414 mA 7.3L ×4.3W ×4.1H 1 1 1 1 TPSD107M010R0100 TPSV227M010R0100 Kemet T520 T495 10 V 10 V 100 µF 100 µF 0.080 Ω 0.100 Ω 1200 mA >1100 mA 7.3L ×5.7W ×4.0H 1 1 1 1 T520D107M010AS T495X107M010AS Sprague 594D/595D 10 V 10 V 150 µF 120 µF 0.090 Ω 0.140 Ω 1100 mA >1000 mA 7.3L ×6.0W ×4.1H 1 1 1 1 594D157X0010C2T 595D127X0010D2T TDK- Ceramic X5R Murata Ceramic X5R 1210 Case 6.3 V 6.3 V 47 µF 47 µF 0.002 Ω 0.002 Ω >1400 mA >1000 mA 3.6L ×2.8W ×2.8H 2 2 2 (max) 2 (max) For technical support and further information, visit http://power.ti.com C3225X5R0J476KT/MT GRM32ER60J476M/6.3 Application Notes PT5400 Series Using the Inhibit Control of the PT5400 SWIFT™ Series of Power Modules For applications requiring output voltage On/Off control, the PT5400 series of SWIFT power modules incorporate an inhibit function. This function can be used wherever there is a requirement for the module to be switched off. The On/Off function is provided by the Inhibit (pin 1) control. The ISR functions normally with Pin 1 open-circuit, providing a regulated output whenever a valid source voltage is applied to Vin, (pin 2). When a low-level2 ground signal is applied to pin 1, the regulator output will be disabled. Figure 3-1 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 open-drain device is required to control this input 1. The Inhibit pin control thresholds are given in Table 3-1. Figure 3-2 Table 3-1; Inhibit Control Requirements Parameter Min Max Vin – 0.5 –0.2V Open Turn-On Time: In the circuit of Figure 3-1, turning Q1 on applies a low-voltage to the Inhibit control (pin 1) and disables the regulator output. Correspondingly, turning Q 1 off allows the ISR to execute a soft-start power up. The soft-start power up consists of a short delay, t d, followed by a period, t(SS), in which the output voltage rises from zero to its full regulation voltage. (See the section on Soft-Start Power Up). The module produces a fully regulated output voltage within 25msec. Figure 3-2 shows the typical rise in both output voltage and input current for a PT5404 (1.8V), following the turn-off of Q1. The turn off of Q1 corresponds to the drop in the Q1 Vgs waveform. The time periods, td and t(SS), are indicated. The waveforms were measured with a 5Vdc input voltage, and 0.7-Ω resistive load. HORIZ SCALE: 5ms/Div Enable (VIH) Disable (VIL) +0.5V Vout (1V/Div) Iin (0.5A/Div) Figure 3-1 +V IN 2 C1 1 0 0µF Inhibit COM Vin PT5401 INH 1 Vo 4 +V O GND 3 Q1 Vgs (10V/Div) td t (SS) Q1 BSS138 COM 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. For technical support and further information, visit http://power.ti.com Application Notes PT5400 Series Adjusting the Output Voltage of the PT5400 Series of 6-A SWIFT Power Modules The output voltage of the PT5400 series of SWIFT power modules may be adjusted higher or lower than the factory trimmed pre-set voltage with the addition of a single external resistor. Table 4-1 gives the allowable adjustment range for each model of the series as Va (min) and Va (max). Adjust Up: An increase in the output voltage is obtained by adding a resistor R2, between pin 5 (Vo adj) and pin 3 (GND). Add a resistor (R1), between pin 5 (Vo adj) and Adjust Down: pin 4 (Vout). The values of (R1) [adjust down], and R2 [adjust up], can either be calculated using the following formulas, or may be looked up from the range of values in Table 4-2. Refer to Figure 4-1 for the placement of the required resistor; either (R1) or R2 as appropriate. = R2 = Where: Vo = Original output voltage Va = Adjusted output voltage Ro = The resistance value from Table 4-1 Figure 4-1 + V IN 2 V in PT5400 GND Vo V o(adj) 3 C2 100µF (Req'd) + VO 4 (R1) Adj Down R2 Adjust Up COM 0.891 Ro Va – Vo – 18.2 kΩ – 18.2 kΩ Notes: 1. Use a 1% (or better) tolerance resistor in either the (R1) or R2 location. Place the resistor as close to the ISR as possible. 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. 5 + Ro (Va – 0.891) Vo – Va (R1) COM 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. Vin(min) = (Va + 1.1) V or as specified in the data sheet, whichever is greater. 4. The PT5408 operates only from a 3.3-V input bus. The limited input to output voltage differential of this model does not allow it to be adjusted higher than its trimmed output voltage. Table 4-1 ISR OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt. No. PT5401 PT5402 PT5408 PT5403 5V 3.3 V 4 PT5404 PT5405 PT5406 PT5407 3.3/5 V 3.3/5 V 3.3/5 V 5V Vo (nom) 3.3 V 2.5 V 2.5 V 2V 1.8 V 1.5 V 1.2 V 1V Va (min) 2.9 V 2.0 V 2.0 V 1.65 V 1.5 V 1.3 V 1.1 V 0.97 V Va (max) 3.5 V 2.95 V 2.5 V 4 2.45 V 2.25 V 1.95 V 1.65 V 1.45 V Ω) Ro (kΩ 10.2 10.2 10.2 10.0 10.0 10.2 9.76 10.2 For technical support and further information, visit http://power.ti.com 3.3/5 V 3.3/5 V Input Bus Application Notes continued PT5400 Series Table 4-2 ISR ADJUSTMENT RESISTOR VALUES Series Pt. No. PT5401 PT5402/8 Vo (nom) 3.3 V 2.5 V Va (req.d) PT5403 2V PT5404 1.8 V PT5405 1.5 V PT5406 1.2 V 0.97 PT5407 1V (8.7) kΩ 1.0 1.05 164.0 kΩ 1.1 (2.2) kΩ 1.15 (32.4) kΩ 1.2 72.7 kΩ 42.4 kΩ 27.2 kΩ 1.25 156.0 kΩ 18.2 kΩ 1.3 (2.7) kΩ 68.8 kΩ 12.1 kΩ 1.35 (13.0) kΩ 39.8 kΩ 7.8 kΩ 1.4 (33.7) kΩ 25.3 kΩ 4.5 kΩ 1.45 (95.8) kΩ 16.6 kΩ 2.0 kΩ 1.5 (2.1) kΩ 10.8 kΩ 1.55 (8.2) kΩ 164.0 kΩ 6.7 kΩ 1.6 (17.3) kΩ 72.7 kΩ 3.5 kΩ 1.1 kΩ 1.65 (3.5) kΩ (32.4) kΩ 42.4 kΩ 1.7 (8.8) kΩ (62.7) kΩ 27.2 kΩ 1.75 (16.2) kΩ (154.0) kΩ 1.8 (27.3) kΩ 1.85 (45.7) kΩ 160.0 kΩ 7.8 kΩ 1.9 (82.7) kΩ 70.9 kΩ 4.5 kΩ 1.95 (194.0) kΩ 41.2 kΩ 2.0 kΩ 2.0 (4.4) kΩ 18.2 kΩ 12.1 kΩ 26.4 kΩ 160.0 kΩ (3) 17.4 kΩ (3) 2.05 (8.1) kΩ 2.1 (12.6) kΩ 70.9 kΩ 11.5 kΩ 2.15 (18.5) kΩ 41.2 kΩ 7.3 kΩ 2.2 (26.3) kΩ 26.4 kΩ 4.1 kΩ 2.25 (37.2) kΩ 17.4 kΩ 1.6 kΩ 2.3 (53.7) kΩ 11.5 kΩ 2.35 (81.0) kΩ 7.3 kΩ 2.4 (136.0) kΩ 4.1 kΩ 2.45 (300.0) kΩ 1.6 kΩ 2.5 2.55 ( Note 4) 164.0 kΩ 2.6 72.7 kΩ 2.65 42.4 kΩ 2.7 27.2 kΩ 2.75 18.2 kΩ 2.8 12.1 kΩ 2.85 7.8 kΩ 2.9 (33.0) kΩ 4.5 kΩ 2.95 (41.8) kΩ 2.0 kΩ 3.0 (53.5) kΩ 3.05 (69.9) kΩ 3.1 (94.5) kΩ 3.15 (135.0) kΩ 3.2 (217.0) kΩ 3.25 (463.0) kΩ 3.3 3.35 164.0 kΩ 3.4 72.7 kΩ 3.45 42.4 kΩ 3.48 32.3 kΩ 3.50 R1 = (Blue) 27.2 kΩ R2 = Black For technical support and further information, visit http://power.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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