PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 3-A, 3.3/5-V INPUT, ADJUSTABLE SWITCHING REGULATOR WITH AUTO-TRACK™ SEQUENCING FEATURES • • • • • • • • • Up to 3-A Output Current at 85°C 3.3-V / 5-V Input Voltage Wide-Output Voltage Adjust (0.9 V to 3.6 V) Efficiencies Up To 94% On/Off Inhibit Undervoltage Lockout (UVLO) Output Overcurrent Protection (Nonlatching, Auto-Reset) Overtemperature Protection Ambient Temperature Range: –40°C to 85°C • • • Surface Mount Package Safety Agency Approvals: UL/CUL 60950, EN60950 VDE (Pending) Point-of-Load Alliance (POLA™) Compatible APPLICATIONS • Telecommunications, Instrumentation, and General-Purpose Circuits DESCRIPTION The PTH04000W is a highly integrated, low-cost switching regulator module that delivers up to 3 A of output current. Occupying a small PCB area, the PTH04000W provides output current at a high efficiency and with minimal power dissipation, thereby eliminating the need for a heat sink. Their small size (0.75 inch × 0.5 inch), high efficiency, and low cost makes these modules practical for a variety of applications. The input voltage range of the PTH04000W is from 3 V to 5.5 V, allowing operation from either a 3.3-V or 5-V input bus. Using state-of-the-art switched-mode power-conversion technology, the PTH04000W can step down to voltages as low as 0.9 V from a 5-V input bus, with typically less than 1 W of power dissipation. The output voltage can be adjusted to any voltage over the range, 0.9 V to 3.6 V, using a single external resistor. This series includes Auto-Track™ sequencing. This feature simplifies the task of supply voltage sequencing in a power system by enabling modules to track each other, or any external voltage, during power up and power down. Other operating features include an undervoltage lockout (UVLO), on/off inhibit, output overcurrent protection, and overtemperature protection. Target applications include telecommunications, test and measurement applications, and high-end consumer products. The modules are available in both through-hole and surface-mount package options, including tape and reel. The PTH04000W is also compatible with TI's roadmap for RoHS and lead-free compliance. STANDARD APPLICATION 1 Track VO 6 2 VI Inhibit 3 CI* 47 µF (Required) PTH04000W (Top View) 4 + 5 CO* 47 µF (Optional) RSET# 1%, 0.1 W (Required) GND GND * See the Application Information section for capacitor recommendations. # See the Application Information section for RSET values. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. POLA, Auto-Track, TMS320 are trademarks of Texas Instruments. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2005, Texas Instruments Incorporated PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION PTH04000W (Basic Model) Output Voltage 0.9 V - 3.6 V Part Number Description Package Designator PTH04000WAH Horizontal T/H - Pb-free EUS PTH04000WAS (1) Horizontal PTH04000WAZ (1) (1) (2) (3) SMD (2) EUT Horizontal SMD - Pb-free (3) EUT Add a T suffix for tape and reel option on SMD packages. S suffix versions have SnPb solder ball Z suffix versions have SnAgCu solder ball ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range unless otherwise noted (1) TA Tstg (1) (2) PTH04000W UNIT -40 to 85 °C Operating free-air temperature Over VI range Lead temperature (H suffix) 5 seconds Solder reflow temperature (S suffix) Surface temperature of module body or pins 235 Solder reflow temperature (Z suffix) (2) Surface temperature of module body or pins 260 (2) 260 Storage temperature °C -40 to 125 °C Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Moisture Sensitivity Level (MSL) Rating Level-3-260C-168HR RECOMMENDED OPERATING CONDITIONS VI Input voltage TA Operating free-air temperature MIN MAX 3 5.5 UNIT V -40 85 °C PACKAGE SPECIFICATIONS PTH04000Wx (Suffix AH, AS and AZ) Weight Flammability Mechanical shock Mechanical vibration (1) 2 Qualification limit. 1.5 grams Meets UL 94 V-O Per Mil-STD-883D, Method 2002.3, 1 msec, ½ sine, mounted 500 G Mil-STD-883D, Method 2007.2, 20-2000 Hz 20 G (1) (1) PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 ELECTRICAL CHARACTERISTICS at 25°C free-air temperature, VI = 5 V, VO = 3.3 V, IO = IO(Max), CI = 47 µF (unless otherwise noted) PARAMETER TEST CONDITIONS MIN Output current VI Input voltage range Over IO range VO(TOL) Set-point voltage tolerance TA = 25°C Temperature variation –40 ≤ TA ≤ 85°C Line regulation Over VI range ±1 Load regulation Over IO range ±5 Total output voltage variation Includes set-point, line, load, –40 ≤ TA ≤ 85°C VO(ADJ) TA = 25°C, natural convection TYP IO Output voltage adjust range 0 3 MAX (2) UNIT (1) A 5.5 V 3 ±2% (3) ±0.5% VO mV mV 3% (3) VI ≥ 4.5 V 0.9 3.6 VI < 4.5 V 0.9 VI – 1.1 (2) V TA = 25°C, IO = 2 A η RSET = 475 Ω, VO = 3.3 V (2) 92% RSET = 2.32 kΩ, VO = 2.5 V (2) 89% RSET = 6.65 kΩ, VO = 1.8 V 86% RSET = 11.5 kΩ, VO = 1.5 V 84% RSET = 26.1 kΩ, VO = 1.2 V 82% RSET = 84.5 kΩ, VO = 1 V 78% Efficiency Output voltage ripple 20 MHz bandwith Overcurrent threshold Reset, followed by autorecovery 10 mVPP 7 A 1 A/µs load step from 50% to 100% IOmax, CO = 47 µF Transient response Recovery time 70 µs VO over/undershoot 100 mV IIL track Track Input Current (pin 2) Pin to GND –130 dVtrack/dt Track Slew Rate Capability CO ≤ CO(max) 1 UVLO Undervoltage lockout VI = increasing VI = decreasing Input high voltage (VIH) Inhibit control (pin 4) Input low voltage (VIL) 2.95 2.7 VI – 0.5 Open –0.2 (STBY) FS Pins 4 and 2 connected, pin 2 open Switching frequency Over VI and IO ranges External input capacitance Ceramic type (C1) 47 (5) Ceramic type (C2) 0 (6) External output capacitance (6) (1) (2) (3) (4) (5) (6) (7) (8) Calculated reliability Per Telcordia SR-332, 50% stress, TA = 40°C, ground benign 700 mA kHz µF 150 47 4 V µA 1 Nonceramic type (C3) Equivalent series resistance (nonceramic) MTBF 10 Input standby current V (4) 0.6 Input low current (IIL) II 3 2.8 µA V/ms (6) 560 (7) µF (8) mΩ 15 106 Hr See SOA temperature derating curves to identify maximum output current at higher ambient temperatures. The minimum input voltage is 3 V or (VO + 1.1) V, whichever is greater. A 5-V input bus is recommended for output voltages higher than 2 V. The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a tolerance of 1% with 100 ppm/°C or better temperature stability. This control pin has an internal pullup to the input voltage VI. An external pullup must not be used. If it is left open circuit, the module operates when input power is applied. A small low-leakage (< 100 nA) MOS field effect transistor (MOSFET) is recommended for control. See the application information for further guidance. An external 47-µF ceramic capacitor is required across the input (VI and GND) for proper operation. Locate the capacitor close to the module. An external output capacitor is not required for basic operation. Additional capacitance at the load improves the transient response. This is the calculated maximum capacitance. The minimum ESR limitation often results in a lower value. See the capacitor application information for further guidance. This is the minimum ESR for all the electrolytic (nonceramic) capacitance. Use 7 mΩ as the minimum when calculating the total equivalent series resistance (ESR) using the max-ESR values specified by the capacitor manufacturer. 3 PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 PIN ASSIGNMENT 1 2 3 6 PTH04000W (Top View) 4 5 TERMINAL FUNCTIONS TERMINAL NAME GND Track NO. I/O This is the common ground connection for the VI and VO power connections. It is also the 0 Vdc reference for the Inhibit , the VO Adjust, and the Track control inputs. 1 2 DESCRIPTION I This is an analog control input that enables the output voltage to follow an external voltage. This pin becomes active typically 20 ms after the input voltage has been applied, and allows direct control of the output voltage from 0 V up to the nominal set-point voltage. Within this range the output voltage follows the voltage at the Track pin on a volt-for-volt basis. When the control voltage is raised above this range, the module regulates at its set-point voltage. The feature allows the output voltage to rise simultaneously with other modules powered from the same input bus. If unused, this input should be connected to VI. NOTE: Due to the undervoltage lockout feature, the output of the module cannot follow its own input voltage during power up. For more information, see the related application report (SLTA054). VI 3 I The positive input voltage power node to the module, which is referenced to common GND. Inhibit 4 I The Inhibit pin is an open-collector/drain-negative logic input that is referenced to GND. Applying a low-level ground signal to this input disables the module's output. When the Inhibit control is active, the input current drawn by the regulator is significantly reduced. If the Inhibit pin is left open-circuit, the module produces an output voltage whenever a valid input source is applied. VO Adjust 5 I A 1% resistor must be connected between this pin and GND (pin 1) to set the output voltage of the module higher than 0.9 V. If left open-circuit, the output voltage defaults to this value. The temperature stability of the resistor should be 100 ppm/°C (or better). The set-point range is from 0.9 V to 3.6 V. The electrical specification table gives the standard resistor value for a number of common output voltages. See the application information for further guidance. VO 6 O The regulated positive power output with respect to the GND node. 4 PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 TYPICAL CHARACTERISTICS (5-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT 100 OUTPUT RIPPLE vs OUTPUT CURRENT 50 VO- Output Voltage Ripple - mVPP VO = 2.5 V VO = 3.3 V Efficiency - % 90 80 VO = 1.8 V 70 VO = 1.5 V VO = 1.2 V VO = 1 V 60 50 0 0.5 1 1.5 2 2.5 40 30 VO = 1.5 V 20 VO = 3.3 V 10 0 3 0 0.5 (2) 2 2.5 Figure 2. POWER DISSIPATION vs OUTPUT CURRENT AMBIENT TEMPERATURE vs OUTPUT CURRENT 90 1 80 0.8 VO = 2.5 V 0.6 0.4 VO = 1 V 0.2 0 (1) 1.5 Figure 1. 1.2 0 1 0.5 1 1.5 2 3 IO - Output Current - A TA - Ambient Temperature - oC PD - Power Dissipation - W IO - Output Current - A 2.5 3 Nat Conv All VO Airflow: 70 60 50 40 30 20 0 0.5 1 1.5 2 IO - Output Current - A IO - Output Current - A Figure 3. Figure 4. 2.5 3 The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to Figure 1, Figure 2, and Figure 3. The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm double-sided PCB with 2 oz. copper. Applies to Figure 4. 5 PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 TYPICAL CHARACTERISTICS (3.3-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT OUTPUT RIPPLE vs OUTPUT CURRENT 100 50 VO = 2 V VO = 1.8 V VO = 1.5 V Efficiency - % 90 VO- Output Voltage Ripple - mVPP 95 85 80 75 VO = 1.2 V 70 VO = 1 V 65 VO = 0.9 V 60 55 50 0 0.5 1 1.5 2 2.5 40 30 VO = 1.8 V 20 VO = 1.2 V 10 VO = 0.9 V 0 3 0 0.5 (2) 6 2.5 Figure 6. POWER DISSIPATION vs OUTPUT CURRENT AMBIENT TEMPERATURE vs OUTPUT CURRENT 90 1 80 0.8 0.6 VO = 1.8 V 0.4 VO = 0.9 V 0.2 0 (1) 2 Figure 5. 1.2 0 1.5 0.5 1 1.5 2 3 IO - Output Current - A TA - Ambient Temperature - oC PD - Power Dissipation - W IO - Output Current - A 1 2.5 3 Nat Conv All VO Airflow: 70 60 50 40 30 20 0 0.5 1 1.5 2 IO - Output Current - A IO - Output Current - A Figure 7. Figure 8. 2.5 3 The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to Figure 5, Figure 6, and Figure 7. The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm double-sided PCB with 2 oz. copper. Applies to Figure 8. PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 APPLICATION INFORMATION Adjusting the Output Voltage of the PTH04000W Wide-Output Adjust Power Modules The VO Adjust control (pin 5) sets the output voltage of the PTH04000W product. The adjustment range is from 0.9 V to 3.6 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected directly between the VO Adjust and GND pin 1. Table 1 gives the standard external resistor for a number of common bus voltages, along with the actual voltage the resistance produces. For other output voltages, the value of the required resistor can either be calculated using the following formula, or simply selected from the range of values given in Table 2. Figure 9 shows the placement of the required resistor. 0.891 V - 3.24 kW RSET = 10 kW x VO - 0.9 V Table 1. Standard Values of Rset for Common Output Voltages VO (Required) (1) RSET (Standard Value) VO (Actual) 3.3 V (1) 475 Ω 3.298 V 2.5 V (1) 2.32 kΩ 2.502 V 2V 4.87 kΩ 1.999 V 1.8 V 6.65 kΩ 1.801 V 1.5 V 11.5 kΩ 1.504 V 1.2 V 26.1 kΩ 1.204 V 1V 84.5 kΩ 1.001 V 0.9 V Open 0.9 V The minimum input voltage is 3 V or (VO + 1.1) V, whichever is greater. 2 Track 3 Inhibit 4 CI 47 µF (Required) VO 6 PTH04000W VI VO VOAdj GND 1 5 RSET 0.05 W 1% + VI GND CO 47 µF (Optional) GND (1) A 0.05-W rated resistor may be used. The tolerance should be 1%, with a temperature stability of 100 ppm/°C (or better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 5 and 1 using dedicated PCB traces. (2) Never connect capacitors from VO Adjust to either GND or VO. Any capacitance added to the VO Adjust pin affects the stability of the regulator. Figure 9. VO Adjust Resistor Placement 7 PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 Table 2. Calculated Set-Point Resistor Values VO Required 8 RSET VO Required RSET VO Required RSET 0.900 Open 1.475 12.3 kΩ 2.55 2.16 kΩ 0.925 353 kΩ 1.50 11.6 kΩ 2.60 2.00 kΩ 0.950 175 kΩ 1.55 10.5 kΩ 2.65 1.85 kΩ 0.975 116 kΩ 1.60 9.49 kΩ 2.70 1.71 kΩ 1.000 85.9 kΩ 1.65 8.64 kΩ 2.75 1.58 kΩ 1.025 68.0 kΩ 1.70 7.90 kΩ 2.80 1.45 kΩ 1.050 56.2 kΩ 1.75 7.24 kΩ 2.85 1.33 kΩ 1.075 47.7 kΩ 1.80 6.66 kΩ 2.90 1.22 kΩ 1.100 41.3 kΩ 1.85 6.14 kΩ 2.95 1.11 kΩ 1.125 36.4 kΩ 1.90 5.67 kΩ 3.00 1.00 kΩ 1.150 32.4 kΩ 1.95 5.25 kΩ 3.05 904 Ω 1.175 29.2 kΩ 2.00 4.86 kΩ 3.10 810 Ω 1.200 26.5 kΩ 2.05 4.51 kΩ 3.15 720 Ω 1.225 24.2 kΩ 2.10 4.19 kΩ 3.20 634 Ω 1.250 22.2 kΩ 2.15 3.89 kΩ 3.25 551 Ω 1.275 20.5 kΩ 2.20 3.61 kΩ 3.30 473 Ω 1.300 19.0 kΩ 2.25 3.36 kΩ 3.35 397 Ω 1.325 17.7 kΩ 2.30 3.12 kΩ 3.40 324 Ω 1.350 16.6 kΩ 2.35 2.90 kΩ 3.45 254 Ω 1.375 15.5 kΩ 2.40 2.70 kΩ 3.50 187 Ω 1.400 14.6 kΩ 2.45 2.51 kΩ 3.55 122 Ω 1.425 13.7 kΩ 2.50 2.33 kΩ 3.60 60 Ω 1.450 13.0 kΩ PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 CAPACITOR RECOMMENDATIONS for the PTH04000W WIDE-OUTPUT ADJUST POWER MODULES Input Capacitor The minimum required input capacitor(s) is 47-µF of ceramic capacitance, in either an X5R or X7R temperature tolerance. The ceramic capacitors should be located within 0.5 inch (1,27 cm) of the regulator's input pins. Electrolytic capacitors can also be used at the input, but only in addition to the required ceramic capacitance. The minimum ripple current rating for nonceramic capacitors should be at least 200 mA rms. The ripple current rating of electrolytic capacitors is a major consideration when they are used at the input. When specifying regular tantalum capacitors for use at the input, a minimum voltage rating of 2 × (maximum dc voltage + ac ripple) is highly recommended. This is standard practice to ensure reliability. Polymer-tantalum capacitors are not affected by this requirement. For improved ripple reduction on the input bus, additional ceramic capacitors can be used to complement the minimum requirement. Output Capacitors (Optional) For applications with load transients (sudden changes in load current), the regulator response benefits from additional external output capacitance. The recommended output capacitance of 47 µF allows the module to meet its transient response specification. A high-quality computer-grade electrolytic capacitor should be adequate. Electrolytic capacitors should be located close to the load circuit. These capacitors provide decoupling over the frequency range, 2 kHz to 150 kHz. Aluminum electrolytic capacitors are suitable for ambient temperatures above 0°C. For operation below 0°C, tantalum or Os-Con-type capacitors are recommended. When using one or more nonceramic capacitors, the calculated equivalent ESR should be no lower than 4 mΩ (7 mΩ using the manufacturer's maximum ESR for a single capacitor). A list of preferred low-ESR type capacitors are identified in Table 3. Ceramic Capacitors Above 150 kHz the performance of aluminum electrolytic capacitors becomes less effective. To further improve the reflected input ripple current, or the output transient response, multilayer ceramic capacitors must be added. Ceramic capacitors have low ESR and their resonant frequency is higher than the bandwidth of the regulator. When placed at the output, their combined ESR is not critical as long as the total value of ceramic capacitance does not exceed 150 µF. Also, to prevent the formation of local resonances, do not exceed the maximum number of capacitors specified in the capacitor table. Tantalum Capacitors Additional tantalum type capacitors can be used at both the input and output, and are recommended for applications where the ambient operating temperature can be less than 0°C. The AVX TPS, Sprague 593D/594/595, and Kemet T495/T510/T520 capacitors series are suggested over many other tantalum types due to their rated surge, power dissipation, and ripple current capability. As a caution, many general-purpose tantalum capacitors have considerably higher ESR and lower ripple current capability. These capacitors are also less reliable as they have lower power dissipation capability and surge current ratings. Tantalum capacitors that do not have a stated ESR or surge current rating are not recommended for power applications. When specifying Os-Con and polymer-tantalum capacitors for the output, the minimum ESR limit is encountered well before the maximum capacitance value is reached. Capacitor Table The capacitor table, Table 3, identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The recommended 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 rating and ESR (at 100 kHz) are critical parameters necessary to insure both optimum regulator performance and long capacitor life. 9 PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 Designing for Load Transients The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of 1 A/µs. The typical voltage deviation for this load transient is given in the data sheet specification table using the optional value of output capacitance. As the di/dt of a transient is increased, the response of a converter's regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation with any dc/dc converter once the speed of the transient exceeds its bandwidth capability. If the target application specifies a higher di/dt or lower voltage deviation, the requirement can only be met with additional output capacitor decoupling. In these cases, special attention must be paid to the type, value, and ESR of the capacitors selected. If the transient performance requirements exceed those specified in the data sheet, the selection of output capacitors becomes more important. Review the minimum ESR in the characteristic data sheet for details on the capacitance maximum. Table 3. Recommended Input/Output Capacitors CAPACITOR CHARACTERISTICS (1) QUANTITY WORKING VOLTAGE VALUE µF EQUIVALENT SERIES RESISTANCE (ESR) 85°C MAXIMUM RIPPLE CURRENT (Irms) Panasonic WA (SMT) FC (SMT) 10 V 25 V 120 47 0.035 Ω 0.400 Ω 2800 mA 230 mA 8 × 6,9 8 × 6,2 1 1 ≤ 4 (2) 1 (2) Panasonic SL SP-cap(SMT) 6.3 V 6.3 V 47 56 0.018 Ω 0.009 Ω 2500 mA 3000 mA 7,3 × 4,3 7,3 × 4,3 1 1 ≤2 ≤1 EEFCD0J470R EEFSL0J560R United Chemi-con PXA (SMT) FS LXZ MVZ (SMT) 10 10 16 16 V V V V 47 100 100 100 0.031 Ω 0.040 Ω 0.250 Ω 0.440 Ω 2250 mA 2100 mA 290 mA 230 mA 6,3 × 5,7 6,3 × 9,8 6,3 × 11,5 6,3 × 5,7 1 1 1 1 1 ≤3 1 1 PXA10VC470MF60TP 10FS100M LXZ16VB101M6X11LL MVZ16VC101MF60TP Nichicon UWG (SMT) F559(Tantalum) PM 16 V 10 V 10 V 100 100 100 0.400 Ω 0.055 Ω 0.550 Ω 230 mA 2000 mA 210 mA 8 × 6,2 7,7 × 4,3 6 × 11 1 1 1 1 ≤3 1 UWG1C101MCR1GS F551A107MN UPM1A101MEH Sanyo Os-con\ POS-Cap SVP (SMT) SP 10 V 6.3 V 10 V 68 47 56 0.025 Ω 0.074 Ω 0.045 Ω 2400 mA 1110 mA 1710 mA 7,3 × 4,3 5×6 6,3 × 5 1 1 1 ≤3 ≤3 ≤3 10TPE68M 6SVP47M 10SP56M AVX Tantalum TPS (SMD) 10 V 10 V 47 47 0.100 Ω 0.060 Ω 1100 mA > 412 mA 7,3 L × 4,3 W × 4,1 H 1 1 ≤3 ≤ 53 TPSD476M010R0100 TPSB476M010R0500 Kemet T520 (SMD) AO-CAP 10 V 6.3 V 68 47 0.060 Ω 0.028 Ω >1200 mA >1100 mA 7,3 L × 5,7 W×4H 1 1 ≤3 ≤3 T520V686M010ASE060 A700V476M006AT Vishay/Sprague 594D/595D (SMD) 10 V 10 V 68 68 0.100 Ω 0.240 Ω >1000 mA 680 mA 7,3 L × 6 W × 4,1 H 1 1 ≤3 ≤3 594D686X0010C2T 595D686X0010C2T 94SL 16 V 47 0.070 Ω 1550 mA 8×5 1 ≤3 94SL476X0016EBP 7,5 L × 4,0 W × 8,0 H ≥1 ≤2 FK22X5R1A476M CAPACITOR VENDOR/ COMPONENT SERIES PHYSICAL SIZE (mm) INPUT BUS (2) OUTPUT BUS VENDOR NUMBER EEFWA1A121P (3) EEVFC1E470P (3) TDK Ceramic X5R (Leaded) 10 V 47 0.005 Ω >1400 mA TDK Ceramic X5R Murata Ceramic X5R Kemet 6.3 V 6.3 V 6.3 V 22 22 22 0.002 Ω 0.002 Ω 0.002 Ω >1400 mA >1000 mA >1000 mA 1210 case 3225 mm ≥ 2 (4) ≥ 2 (4) ≥ 2 (4) ≤3 ≤3 C3225X5R0J226KT/MTGR M32ER61J223M C1210C226K9PAC TDK Ceramic X5R Murata Ceramic X5R Kemet 6.3 V 6.3 V 6.3 V 47 47 47 0.002 Ω 0.002 Ω 0.002 Ω >1400 mA >1000 mA >1000 mA 1210 case 3225 mm ≥1 ≥1 ≥1 ≤2 ≤2 ≤2 C3225X5R0J476KT/MT GRM32ER60J476M/6.3 C1210C476K9PAC (1) (2) (3) (4) 10 Check with capacitor manufacturers for availability and lead-free status. A ceramic capacitor is required on the input. An electrolytic capacitor can be added to the output for improved transient response. An optional through-hole capacitor available. A total capacitance of 44 µF is an acceptable replacement for a single 47-µF capacitor. PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 Features of the PTH/PTV Family of Nonisolated, Wide-Output Adjust Power Modules POLA™ Compatibility The PTH/PTV family of nonisolated, wide-output adjustable power modules from Texas Instruments are optimized for applications that require a flexible, high-performance module that is small in size. Each of these products are POLA™ compatible. POLA-compatible products are produced by a number of manufacturers, and offer customers advanced, nonisolated modules with the same footprint and form factor. POLA parts are also ensured to be interoperable, thereby providing customers with true second-source availability. Soft-Start Power Up The Auto-Track feature allows the power up of multiple PTH/PTV modules to be directly controlled from the Track pin. However, in a stand-alone configuration, or when the Auto-Track feature is not being used, the Track pin should be directly connected to the input voltage, VI (see Figure 10). 5 2 Track VI = 5 V 3 VO = 2.5 V 6 VI VO PTH04000W Inhibit 4 GND 1 + CI 47 µF (Required) VO Adj 2.33 kW 0.05 W, 1% CO 47 µF (Optional) GND GND Figure 10. Power-Up Application Circuit When the Track pin is connected to the input voltage, the Auto-Track function is permanently disengaged. This allows the module to power up entirely under the control of its internal soft-start circuitry. When power up is under soft-start control, the output voltage rises to the set-point at a quicker and more linear rate. VI (1 V/div) VO (1 V/div) II (1 A/div) t - Time = 10 ms/div Figure 11. Power-Up Waveform From the moment a valid input voltage is applied, the soft-start control introduces a short time delay (typically 11 PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 less than 5 ms) before allowing the output voltage to rise. The output then progressively rises to the module set-point voltage. Figure 11 shows the soft-start power-up characteristic of the PTH04000W, operating from a 5-V input bus and configured for a 2.5-V output. The waveforms were measured with a 3-A resistive load and the Auto-Track feature disabled. The initial rise in input current when the input voltage first starts to rise is the charge current drawn by the input capacitors. Power up is complete within 25 ms. Current Limit Protection The PTH04000W modules protect against load faults with a continuous current limit characteristic. Under a load fault condition, the output current cannot exceed the current limit value. Attempting to draw current that exceeds the current limit value causes the output voltage to be progressively reduced. Current is continuously supplied to the fault until it is removed. On removal of the fault, the output voltage promptly recovers. Thermal Shutdown Thermal shutdown protects the module internal circuitry against excessively high temperatures. A rise in temperature may be the result of a drop in airflow, a high ambient temperature, or a sustained current limit condition. If the junction temperature of the internal components exceeds 150°C, the module shuts down. This reduces the output voltage to zero. The module starts up automatically, by initiating a soft-start power up when the sensed temperature decreases 10°C below the thermal shutdown trip point. Output On/Off Inhibit For applications requiring output voltage on/off control, the PTH04000W power module incorporates an output on/off Inhibit control (pin 4). The inhibit feature can be used wherever there is a requirement for the output voltage from the regulator to be turned off. The power module functions normally when the Inhibit pin is left open-circuit, providing a regulated output whenever a valid source voltage is connected to Vin with respect to GND. Figure 12 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit control has its own internal pullup to VI potential. An open-collector or open-drain device is recommended to control this input. Turning Q1 on applies a low voltage to the Inhibit control pin and disables the output of the module. If Q1 is then turned off, the module executes a soft-start power-up sequence. A regulated output voltage is produced within 20 ms. Figure 13 shows the typical rise in the output voltage, following the turn off of Q1. The turn off of Q1 corresponds to the rise in the waveform, V(INH). The waveforms were measured with a 2-A resistive load. 12 PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 2 5 VO Adj Track 3 VI Inhibit 4 C1 47 µF (Required) VO = 1.8 V 6 PTH04000W VO GND 1 + VI = 5 V RSET 6.65 kÙ 0.05 W, 1% CO 47 µF (Optional) L O A D Inhibit Q1 BSS138 GND GND Figure 12. On/Off Inhibit Control Circuit VO (1 V/div) II (500 mA/div) V(INH) (10 V/div) t - Time = 10 ms/div Figure 13. Power Up Response From Inhibit Control Auto-Track™ Function The Auto-Track function is unique to the PTH/PTV family, and is available with all POLA products. Auto-Track was designed to simplify the amount of circuitry required to make the output voltage from each module power up and power down in sequence. The sequencing of two or more supply voltages during power up is a common requirement for complex mixed-signal applications that use dual-voltage VLSI ICs such as the TMS320™ DSP family, microprocessors, and ASICs. 13 PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 How Auto-Track™ Works Auto-Track works by forcing the module output voltage to follow a voltage presented at the Track control pin (1). This control range is limited to between 0 V and the module set-point voltage. Once the track-pin voltage is raised above the set-point voltage, the module output remains at its set-point (2). As an example, if the Track pin of a 2.5-V regulator is at 1 V, the regulated output is 1 V. If the voltage at the Track pin rises to 3 V, the regulated output does not go higher than 2.5 V. Under Auto-Track control, the regulated output from the module follows the voltage at its Track pin on a volt-for-volt basis. By connecting the Track pin of a number of these modules together, the output voltages follow a common signal during power up and power down. The control signal can be an externally generated master ramp waveform, or the output voltage from another power supply circuit (3). For convenience, the Track input incorporates an internal RC-charge circuit. This operates off the module input voltage to produce a suitable rising waveform at power up. U1 5 2 VOAdj Track VO1 = 3.3 V 5V 3 6 Inhibit 4 C1 0V VO PTH04000W VI GND 1 C2 475 W U3 TPS3808G50* 6 4 5 VOAdj Track VCC MR 1 3 RESET C3 4700 pF VI PTH05050W Inhibit CT GND 2 C4 0.1 µF C5 VO 6 GND 4 *Use TPS3808G33 with 3.3-V input modules. Figure 14. Auto-Track Circuit 14 VO2 = 1.8 V SENSE + 3 2 + 5 U2 1 C6 5.49 kW PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 V(TRK) (1 V/div) V(TRK) (1 V/div) VO1 (1 V/div) VO1 (1 V/div) VO2 (1 V/div) VO2 (1 V/div) t - Time = 10 ms/div t - Time = 400 ms/div Figure 15. Simultaneous Power-Up With Auto-Track Control Figure 16. Simultaneous Power-Down With Auto-Track Control Typical Application The basic implementation of Auto-Track allows for simultaneous voltage sequencing of a number of Auto-Track compliant modules. Connecting the Track inputs of two or more modules forces their track input to follow the same collective RC-ramp waveform, and allows their power-up sequence to be coordinated from a common track control signal. This can be an open-collector (or open drain) device, such as a power-up reset voltage supervisor IC. See U3 in Figure 14. To coordinate a power-up sequence, the Track control must first be pulled to ground potential. This should be done at or before input power is applied to the modules. The ground signal should be maintained for at least 20 ms after input power has been applied. This brief period gives the modules time to complete their internal soft-start initialization (4), enabling them to produce an output voltage. A low-cost supply voltage supervisor IC, that includes a built-in time delay, is an ideal component for automatically controlling the track inputs at power up. Figure 14 shows how the TPS3808G50 supply voltage supervisor IC (U3) can be used to coordinate the sequenced power-up of two 5-V input Auto-Track modules. The output of the TPS3808G50 supervisor becomes active above an input voltage of 0.8 V, enabling it to assert a ground signal to the common track control well before the input voltage has reached the module's undervoltage lockout threshold. The ground signal is maintained until approximately 27 ms after the input voltage has risen above U3's voltage threshold, which is 4.65 V. The 27-ms time period is controlled by the capacitor C3. The value of 4700 pF provides sufficient time delay for the modules to complete their internal soft-start initialization. The output voltage of each module remains at zero until the track control voltage is allowed to rise. When U3 removes the ground signal, the track control voltage automatically rises. This causes the output voltage of each module to rise simultaneously with the other modules, until each reaches its respective set-point voltage. Figure 15 shows the output voltage waveforms from the circuit of Figure 14 after input voltage is applied to the circuit. The waveforms, VO1 and VO2 represent the output voltages from the two power modules, U1 (3.3 V) and U2 (1.8 V), respectively. VO1 and VO2 are shown rising together to produce the desired simultaneous power-up characteristic. The same circuit also provides a power-down sequence. When the input voltage falls below U3's voltage threshold, the ground signal is reapplied to the common track control. This pulls the track inputs to zero volts, forcing the output of each module to follow. See Figure 16. Power-down is normally complete before the input voltage has fallen below the modules' undervoltage lockout. This is an important constraint. Once the modules recognize that an input voltage is no longer present, their outputs can no longer follow the voltage applied at their track input. During a power-down sequence, the fall in the output voltage from the modules is limited by the Auto-Track slew rate capability. 15 PTH04000W www.ti.com SLTS247A – JUNE 2005 – REVISED JULY 2005 Notes on Use of Auto-Track™ 1. The Auto-Track function tracks almost any voltage ramp during power up, and is compatible with ramp speeds of up to 1 V/ms. 2. The Track pin voltage must be allowed to rise above the module set-point voltage before the module regulates at its adjusted set-point voltage. 3. The absolute maximum voltage that may be applied to the Track pin is the input voltage VI. 4. The module cannot follow a voltage at its track control input until it has completed its soft-start initialization. This takes about 20 ms from the time that a valid voltage has been applied to its input. During this period, it is recommended that the Track pin be held at ground potential. 5. The Auto-Track function is disabled by connecting the Track pin to the input voltage (VI). When Auto-Track is disabled, the output voltage rises at a quicker and more linear rate after input power has been applied. 16 PACKAGE OPTION ADDENDUM www.ti.com 19-Aug-2005 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty PTH04000WAH ACTIVE DIP MOD ULE EUS 6 56 TBD Call TI Level-1-235C-UNLIM PTH04000WAS ACTIVE DIP MOD ULE EUT 6 49 TBD Call TI Level-1-235C-UNLIM PTH04000WAST ACTIVE DIP MOD ULE EUT 6 250 TBD Call TI Level-1-235C-UNLIM PTH04000WAZ ACTIVE DIP MOD ULE EUT 6 49 TBD Call TI Call TI PTH04000WAZT ACTIVE DIP MOD ULE EUT 6 250 TBD Call TI Call TI Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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