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TPS544B25/C25 PMBus™ Voltage Mode 20A/30A SWIFT™ Buck Converter with Frequency Synchronization in PowerStack™ QFN package 1 TPS544B25/C25 4.5-18V, 20A/30A Voltage Mode SWIFT™ Buck Converter with PMBus Programming and Telemetry, and Frequency Synchronization Features Benefits •4.5V to 18V Input Voltage, 0.5V to 5.5V Output Voltage • Works with 5V and 12V bus, Wide Output Voltage Range •Programmable Output Voltage and Margining • Easy programming of output voltage eliminating external circuits •PMBus 1.2 telemetry on voltage, current and temperature • Easy characterization of boards, real-time monitoring of systems for increased reliability and diagnostics •Differential mode Vsense; ±0.5% Accurate Vref from -40C to 85C, ±1% to 125C junction temperature range •Frequency Synchronization •5.5/2.0mohm High Side/Low Side MOSFET Rds(on) •Nonvolatile memory for storing power supply values • Tight voltage regulation; spec includes error amp offset; more headroom to meet tight overall tolerance specs • Can be synchronized to external clock for lower EMI • 88% efficiency at 12VIN, 1.5Vout/30A, 460KHz Fsw, no airflow •Easy-to-use Fusion Digital Power Designer GUI • Ease of design, can store new values, and create a new design in <1 minute •40-pin, 5x7mm PowerStack™ package with large, single GND pad; • Ease of validation, export PMBus script for manufacturing •Choice of hiccup or latchoff OCP • Easy top layer PCB layout, easy heatsinking into PCB GND layers, excellent thermal performance (30A SOA) Vin Applications CVIN VIN VDD VSET DIFFO FB VOUTS+ VOUTSBOOT COMP Pin Compatible BP3 TPS544C25 30-A TSNS/SS 20-A SMBALRT# TPS544B25 CNTL AGND SW GND DATA Iout TPS544B25/C25 CLK Device Vout PGOOD SYNC/ RESET_B RT ADDR1 Enterprise Server/Storage Systems Ethernet Switches, Base Stations, and Routers Video Surveillance Industrial and Embedded computers Software Defined Radios Factory Automation High-End Programmable Logic Controllers ADDR0 • • • • • • • CVDD BP6 2 TPS544B25/C25 TI First 4.5-18V, 20A/30A Voltage Mode SWIFT™ Buck Converter with PMBus programmability and Voltage, Current and Temperature Telemetry Features Discovery Questions Pricing & Availability • Control Mode: Voltage Mode with Input Feedforward • Interface: PMBus 1.2 • Feedback Voltage Accuracy: ±1% from -40ºC to +º125C Junction Temperature • MOSFET Rds(on), High Side/Low Side: 5.5/2mohm • Voltage Sensing: Differential Remote • PMBus programming: Soft Start, Soft Stop, Delays, PGOOD, OVP, UVP, OTP, UVLO, ILIM, Vout, Voltage Margin, OverCurrent Protection Mode (Latch Off or Hiccup) • EMI control: Frequency Synchronization • Monitoring Accuracy: ±15% (IOUT), ±2% (VOUT), ±5ºC (External Temperature) • Reset: Reset Vout Function (without power cycling) • Package: 5x7mm 40 pin PowerStack™ QFN 3 TPS544B25/C25 TI First 4.5-18V, 20A/30A Voltage Mode SWIFT™ Buck Converter with PMBus programmability and Voltage, Current and Temperature Telemetry • Do you have high-current ASICs or DSPs in your system? • TPS544B25/C25 can power up to 30A ASICs with high efficiency, and power density, while adding PMBus programming and monitoring for ease of use and system diagnostics. • Is thermal performance and power density critical to your ASIC power design? • TPS544B25/C25 enables easy heatsinking into the internal PCB GND layers with GND vias connected to the large, single GND pad on the bottom of the IC; PMBus, up to 1MHz Fsw, and low FET Rds(on) enable a single sided 32x36mm 30A solution with 112ºC IC case temp at 30A with no airflow (max Tjunction is 150ºC) Features Discovery Questions Pricing & Availability • Do you want to control EMI? • TPS544B25/C25 has Frequency Synchronization via connection to an external clock 4 TPS544B25/C25 TI First 4.5-18V, 20A/30A Voltage Mode SWIFT™ Buck Converter with PMBus programmability and Voltage, Current and Temperature Telemetry Features Discovery Questions Pricing Availability Resources Product Info: TPS544B25/C25 Pricing 1Ku: TPS544C25 $4.49, TPS544B25 $4.08 Availability: – Silicon: – Samples Now – Full production Now – Evaluation Boards: TPS544B25/C25EVM, Now – Software: Fusion Digital Power Designer, Now – Datasheet: See TI.com, Now Additional resources: Support: Digital Power Landing Page TI Designs: Etherner Switch PMBus POL TI Design using the TPS544B25/C25 USB-to-GPIO Adapter: HPA174 USB Interface Adapter EVM SWIFT POL: www.ti.com/swift TPS544B25/C25 4.5-18V, 20A/30A Voltage Mode SWIFT™ Buck Conveter with PMBus programmability and Voltage, Current and Temperature Telemetry • Why were these parts developed? – High-current ASIC core and I/O power rails are increasing in server and communication systems. Customers require highly efficient, power dense step down dc/dc converters with higher level of integration to achieve low system cost, ease of use, complete protection, and better reliability. – Customers need PMBus to monitor ASIC rails for characterization, debugging, as well as remote diagnostics through IOUT, VOUT, TEMP and FAULT telemetry . – Customers want to be able to create new designs fast, and ensure low EMI risk. • What differentiates this part? – TI’s first Voltage Mode PMBus High-Current Buck Converter – Frequency Synchronization for low EMI risk – Standard PMBus rev1.2 VOUT_COMMAND requires no firmware change to adjust Output Voltage 6 TPS5423x/5433x/5453x TPS62175 28V, 2-5A, Synchronous/non-synchronous 28V, 500mA LM34922 20V, 1A LMR12010 20V, 5A, Synchronous, CM, Flexible, Eco-Mode LMR12015/20 20V, 2A, nonsynchronous Need more? See Parametric Search: Buck Converter 730Vin TPS51362 22V, 10A, Low Iq TPS65286 TPS51363 TPS51367 6A buck+ dual USB switch 22V, 8A 22V, 12A, Low Iq TPS65261/2/3, TPS65251 TPS62110 17V, 1.5A LM21305 28V, 2A, Nonsynchronous, COT, 1MHz LM2734 20V, 1A, non-sync TPS544C25 TPS65400 18V, 30A, VM 4.5V-18V input, 3A/2A/2A triple buck, (+LDO), (+I2C) 4A/4A/2A/2A, +PMBus/I2C TPS544C20 < 20V Input Max Maximum Input Voltage (V) ≥ 20V Input Max Step-Down Converter: 7V – 30V Vin TPS65266 TPS65273V/6V/9V 2.7V -6.5V, 3A/2A/2A, triple buck +600mA LDO dual buck+ I2C interface, 18V, 30A, PMBus Config + Telemetry TPS54x94/54x95 /542941/542951 TPS62184 TPS56221 18V; 2A~4A, Dual buck 17V, 5A 14V, 25A LM2736 TPS65580/1 TPS54x25/54x26, TPS54x27/54x28 TPS544B25 18V, 750mA 18V, 2.5A/1.5A/1.5A Triple buck 18V, 2-6.5A 18V, 20A, VM TPS560200 TPS53511 17V, 500mA, SOT-23 18V, 1.5A TPS62170/72/Q1 TPS62160/-Q1 TPS65257/8 17V, 1A 3A buck + USB switches 17V, 500mA TPS62125 17V, 300mA TPS65283/-1 3.5A/2.5A dual buck, integrated USB switch18V, Dual 3.5A+3.5A TPS/TLV6215x TPS5622xx/5632 /A xx 17V, 1A 17V, 2-3A, SOT-23 TPS544B20 TPS65279 TPS563900 18V, 5A/5A Dual buck TPS566250 TPS56X20 17V, 6, high res VID control 17V, 5A~12A, VID control TPS54320 TPS54620/2 TPS54020 17V, 3A 17V, 6A 17V, 10A 18V, 20A PMBus Config + Telemetry TPS53353/5 15V, 20/30A TPS56121 14V, 15A TPS62120 TPS62160 TPS62134 TPS56628 TPS56921 17V, 1A 17V, 3.2A 18V, 6A TPS53515 15V, 75mA 17V, 9A, I2C 18V, 12A TPS62122 LM2651 TPS6214x/xA TPS62180 TPS53513 14V, 1.5A 17V, 2A TPS53915 15V, 75mA TLV/TPS62130 /A 15V, 6A 18V, 8A 18V, 12A, PMBus™ <1 A 1A 2A 17V, 3A 3A Output Current (A) 4-6A 8-10A >10 A NEW EXISTING Success Stories: TPS544B25/C25 in Base Stations Device Overview TI First RTM Call Where We Won Why We Won Who: Tier 2 Base Station manufacturer • On TI TIC6630 Reference Design Enabled customer to cut-and-paste TI Design for quick Time To Market (TTM) • AVS Capability PMBus VOUT_COMMAND enabled Vout Adjustment On The Fly (AVS) • Tight Voltage Regulation ±1% over temperature enabled customer more headroom and output capacitor savings for ±5% total regulation spec (FB accuracy, ripple, DC regulation, load transients) • Highest density solution on the market, reduced total cost, board space and component count • Shortened development cycle Software GUI enabled hardware engineers to modify, and configure on the fly (NVM onboard) through PMBus, no coding or software engineer support needed 8 What: TPS544B25/C25 Where: TI TCI6630 (Lamar) DSP core rail in LTE Base Station board Volume: 50ku / year Customer Need: High-Efficiency, Power Dense 30A buck converter with Adaptive Voltage Scaling (AVS) capabilities and tight voltage regulation due to total +/-5% regulation spec TPS544C25 Success Stories: TPS544C25 powering TI’s AM5K2E02/04 DSP on Gateway Device Overview TI First RTM Call Where We Won Why We Won Who: Tier 2 Comm Gateway OEM in Europe • On TI AM5K2E02/04 Reference Design Enabled customer to cut-and-paste TI Design for quick Time To Market (TTM) • AVS Capability PMBus VOUT_COMMAND enabled option for Vout Adjustment On The Fly (AVS) to optimize performance • Output Voltage/Current/Temperature Monitoring enabled monitoring of highcurrent DSP core rail for observing system performance and increasing reliability • Highest density solution on the market, reduced board space and component count • Shortened development cycle PMBus GUI enabled engineers to modify, and configure on the fly (NVM on-board) through PMBus, no coding or software engineer support needed; programming script generated by putting PMBus commands together 9 What: TPS544C25 Where: Smart Gateway - AM5K2E02/04 DSP core power rail Volume: 100KU/year Customer Need: High-Efficiency, Power Dense 30A buck converter with Adaptive Voltage Scaling (AVS) capabilities and Output Voltage/Current and Temperature Monitoring Competitive Landscape (1/2) TPS544C25 IR3846M ISL8271M LTC3880 Device Type Single Phase iFET Single Phase iFET Single Phase Module Multi-Phase Controller Input Voltage 4.5 - 18V 1.5 – 21V 4.5 – 14V 4.5 – 24 V Programmable VIN UVLO Through PMBus Through External Pin Through PMBus Through PMBus Reference and Accuracy Tj = -40oC to 125oC 0.5V – 0.6V, ±1.5% 0.6V – 1.5V, ±1% 0.6V, ±1% ±1% Vout accuracy over line, load and temp, TA = -20oC to 85oC 0.5% at TA=25C 0.5 - 5.5V 0.6V – 0.86*Pvin (4.5-7.5V bias) 0.54 - 5.5V 0.5 to 5.4 V True Differential Sense Yes Yes Yes Yes Output Voltage Margin Yes (VOUT_COMMAND) Yes Yes Yes Yes (through VOUT_COMMAND) No Yes (through VOUT_COMMAND) Yes (VOUT_COMMAND) No Yes No No Sequential (programmable TON_RISE TON_DELAY TOFF_FALL and TOFF_DELAY) Sequential Ratiometric Simultaneous Sequential (PMBus MFR command ) Sequential TON_DELAY, TOFF_DELAY, TON_RISE, TOFF_FALL Low-side OC Limit Programmable 3 Selectable Programmable Programmable (Avg. DCR) High-side OC Limit Fixed No Unknown (DCR sensing) Programmable Fixed Options Restart, Shutdown, Ignore OV Latch-off, OC Hiccup restart or latch off; plus VIN OV/UV, DRV OV/UV, UC Pull-Down, Hiccup, Latch-Off, Ignore Yes Yes Unknown Unknown Features Output Voltage Digital AVS Support External tracking Sequencing Output UVP/OVP/OCP Response OV Enabled During Soft-Start Programmable 200kHz-1000kHz through ext. pin Selectable 300kHz-1500kHz Programmable 300kHz-1066kHz through PMBus Programmable through PMBus AND Resistor (250kHz-1000kHz), Phase shift MP Synchronization Yes Yes (PLL based) Yes, (PLL based), phase spreading for upto 16 devices Yes PMBus Support PMBus 1.2 (52 commands to customer) No PMBus 1.2 (84 commands to customer) PMBus 1.1 Yes, V/I/T ±2%/±15%/±5C No Yes, output V (±2% -40C to 85C)/I (±2A at room), input V, internal T(±5C), ext. T, Duty, Fsw, VDRV Yes – VIN, IIN, VOUT, IOUT, TEMP, Duty, Pout VM with FeedForward VM with FeedForward, Body Braking for Load Dump Trans. Digital Control Current Mode Control Control Switching Frequency Telemetry Through PMBus FET, Package Control Topology Eco-Mode No No No Yes External Compensation Yes Yes No Yes D-CAP2/3 with Offset Reduction N/A N/A N/A No D-CAP2/3 with RC Optimization N/A N/A N/A No Gen 2.1, 25V/10V 30A: HS/LS=5.5/2.0mW MCM, 25V/10V 35A: HS/LS=3.1/1.27mW 33A Controller 20/15ns Unknown, post package trim Unknown Unknown 26pin LQFN 5x7x1mm 40pin HDA 17x19x3.55mm 40pin LQFN 6x6mm Rds_on and TDC current Dead-Time Package 40pin LQFN 5x7x1.5mm TI Confidential – NDA Restrictions 10 Competitive Landscape (2/2) TPS544C25 Device Type Input Voltage Programmable VIN UVLO Reference and Accuracy Tj = -40oC to 125oC Output Voltage Features True Differential Sense Output Voltage Margin Digital AVS Support External tracking Single Phase iFET 2+1 Digital Controller Single Controller 4.5 - 18V 2.9 – 3.6 V (controller) 4.5V – 16V UVLO Power Stage 4.5V to 14V Through PMBus R-Divider + i2C Through PMBus 4V - 12V 0.5V – 0.6V, ±1.5% 0.6V – 1.5V, ±1% 0.5% (1-1.5V), 1.1% (1.55-2.3V) 5 mV (0.8-0.995V), 8mV (0.25-0.8V) 0 to 85 C 0.5% (25C), 1% (-40 to 85C) 0.5 - 5.5V 0.25 – 2.3 V 0.5 to 5.25V Yes Yes Yes Yes (VOUT_COMMAND) Yes Yes Yes (through VOUT_COMMAND) Yes (PMBus Margin + i2c VID) Yes (VOUT_COMMAND) No No Yes Sequentiel/Simultaneous (2+1 can start at the same time) MFR Ton_rise, delays Sequential + Ratiometric (tracking) TON_RISE, TOFF_FALL, TON/OFF_DELAY Low-side OC Limit Programmable Programmable (DCR) “slow ocp” DCR (Programmable) High-side OC Limit Fixed Programmable “Fast OCP” DCR (Programmable) Restart, Shutdown, Ignore Shutdown, ON until Vout < UV Restart, Shutdown, ignore Yes Yes (Programmable) Unknown Programmable 200kHz-1000kHz through ext. pin 200 kHz to 2 MHz 300 kHz – 1 Mhz Synchronization Yes No Yes PMBus Support PMBus 1.2 (52 commands to customer) Yes (i2C + PMBus) Information not in DS Yes Yes, V/I/T ±2%/±15%/±5C Yes, VIN, IIN, VOUT, IOUT, POUT, PIN, EFFICIENCY VIN, VOUT, IOUT, VOUT, DUTY, FREQUENCY, TEMP (ext) VM with FeedForward Digital Digital Eco-Mode No Yes No External Compensation Yes No No D-CAP2/3 with Offset Reduction N/A n/a n/a N/A n/a n/a Gen 2.1, 25V/10V 30A: HS/LS=5.5/2.0mW External Power Stage External Power Stage Output UVP/OVP/OCP Response OV Enabled During Soft-Start Switching Frequency Control MAX15301 Sequential (programmable TON_RISE TON_DELAY TOFF_FALL and TOFF_DELAY) Sequencing Telemetry Through PMBus Control Topology FET, Package IR36021 D-CAP2/3 with RC Optimization Rds_on and TDC current Dead-Time Package 20/15ns Power stage Power stage 40pin LQFN 5x7x1.5mm 32 pin 5x5 QFN 32 pin 5 x 5 QFN TI Confidential – NDA Restrictions 11 2 Parts/families that work well together TPS544B25/C25 and UCD90240 TI First RTM Call 20A/30A PMBus SWIFT™ step-down dc/dc converters + 24-rail PMBus Sequencer/Manager Performance Capabilities • TPS544B25/C25 • 4.5V to 18V Input, 0.6V to 5.5Voutput • 20A and 30A pin-to-pin devices • 5.5/2mOhm High/Low-Side FET Rds(on) • Adaptive Voltage Scaling through PMBus • Output Voltage ,and Current Telemetry • UCD90240 • Monitor, Enable, Margin 24 voltage rails • 100 Fault Logs • Black Box Fault Log with fine time stamp • 256k Flash Memory Cascadable by 4 for 96 rail management PMBus 3.3VIN • Ability to regulate voltage rails up to 30A with 1% Vref accuracy up to 125ºC • High power density and complete rail management and reporting through PMBus • Closed loop Adaptive Voltage Scaling and Margining with Frequency Synchronization Applications • Communications • Ethernet Switches, Base Stations • Enterprise Servers and Storage • Performance Servers, Storage Attach Boxes • Test & Measurement • FPGA Testers, Network/Spectrum Analyzer 4.5V to 18V VIN UCD90240 TPS544B25/C25 24-Rail PMBus Sequencer/Manager . . . 24 analog POL voltage rails 20A/30A SWIFT™ 5 x 7mm PowerStack ™QFN 12 TI Designs/Application: PMP10896 Getting Your Customer Started Device Overview TI First RTM Complete PMBus Ethernet Switch POL Rail Power Supply Reference Design PMP10896 Solution Features Solution Benefits • • • • • • Hot Swap, DC/DC Regulators and Sequencers/Monitors with PMBus UCD90240 PMBus Manager • 24 rails, cascadable to 96 Eight (8) Voltage Regulators Single and Multiphase Buck Converters Fusion GUI with Closed-Loop Adaptive Voltage Scaling (AVS) • • Complete PMBus power system for 3 ASIC/FPGA cores, DDR3 core memory, and auxiliary voltages found on high-performance Ethernet Switches 12V / 300W system power solution with eight (8) point-of-load buck converters, including single and multiphase buck power supplies High power density power conversion with Inductor-On-Top -IC designs Tools & Resources PMP10896 pictured PMP10896 TI Fusion GUI •PMP10896 •Power ICs:TPS544B25/C25, TPS53355, TPS53319, TPS53513, TPS53515, TPS544C25x2, TPS40428, LM25066A, TPS62153, TPS715A33 •Includes: Test Data, BOM, Schematic, Design Files 13 TI Design Tools: Web-Orderable EVM Device Overview TI First RTM TPS544C25EVM-681 Evaluation Module EVM Features EVM Benefits • • • • • Regulated 0.95-V output up to 30-A DC, steadystate output current Configurable features via the PMBus interface include Output Voltage, UVLO, Soft Start, Enable, Fault Limits and Programmable Response Convenient Test Points for Probing Critical Waveforms Optional External Temperature Sensor • • • Up to 30A Buck Converter with PMBus Configurability and Monitoring Ease to use Fusion GUI Software for PMBus Enables measuring key power supply parameters including line/load regulation, efficiency, Bode Plot, Load Transient Response, Output Voltage Ripple, Pre-Biased Start-Up, Sequencing/Control and System Protection and Monitoring features Thermal Image available on User Guide Tools & Resources •TPS544C25EVM-681 14 Device Overview TI First Who to Sell To… Application Area #1 (Communications) Application Area #2 (Servers/Storage) Application Area #3 (Test & Measure) Example End Equipments • Cellular Basestations • RRH (remote radio heads) • DAS/Cellular Repeaters • Intel VR12.5/VR13 Servers • Storage Attach Boxes • High-Current Storage Controller ASICs on Enterprise SSD Cards/HBAs/HICs • • • • Key Market Differentiators • Full PMBus telemetry from Industry’s first 30A PMBus Voltage Mode Converter • High Switching Frequency with Low Rds(on) FETs in PowerStack QFN enables Single-Sided 30A solution in 32mm x 36mm PCB area • 1% Vref accuracy over temperature for tight load regulation • Frequency Synchronization up to 1.2MHz for low EMI • Pinstraping for default output voltages with AVS through PMBus • Full Differential Remote Voltage Sensing for tight load regulation • Full PMBus telemetry from Industry’s first 30A PMBus Voltage Mode Converter • High Switching Frequency with Low Rds(on) FETs in PowerStack QFN enables Single-Sided 30A solution in 32mm x 36mm PCB area • 1% Vref accuracy over temperature for tight load regulation • Frequency Synchronization up to 1.2MHz for low EMI • Pinstraping for default output voltages with AVS through PMBus • Full Differential Remote Voltage Sensing for tight load regulation • Full PMBus telemetry from Industry’s first 30A PMBus Voltage Mode Converter • High Switching Frequency with Low Rds(on) FETs in PowerStack QFN enables Single-Sided 30A solution in 32mm x 36mm PCB area • 1% Vref accuracy over temperature for tight load regulation • Frequency Synchronization up to 1.2MHz for low EMI • Pinstraping for default output voltages with AVS through PMBus • Full Differential Remote Voltage Sensing for tight load regulation FPGA Testers Spectrum Analyzer Vector Analyzer Communications/Network Testers 15 FAQs • What are the key upgrades in TPS544C25/B25 vs. TPS544C20/B20? – Voltage–mode topology for frequency synchronization to eliminate beat noise and reduce EMI/ EMC. – PMBus 1.2 facilitates easy AVS and standard PMBus VOUT_COMMAND (no firmware change) • Is the TPS544C25/C25 considered a superior replacement for TPS544C20/B20? – TI offers a portfolio of products – with different advantages - to meet varying customer applications needs; For example, TPS544C20/B20’s DCAP2 mode has lower undershoot and faster response to load transients without the need for external compensation; TPS544C25/B25’s voltage-mode offers fixed, synchronizable frequency to eliminate beat noise and reduce EMI/ EMC. • Can the TPS544C25/B25 be stacked for higher power requirements? – No, these converters are designed for single-phase operation. Refer to TI’s multi-phase controllers with PMBus for additional options. 16 FAQs • Why is the output voltage limited to 5.5V? Why are higher duty cycles not supported? – . The device’s architecture has been optimized for target applications that typically require very low core and I/O voltages. The Output Voltage is limited by Max DIFFO Output Voltage – datasheet spec is VBP6-0.2 • Can the TPS544B25/C25 be used without PMBus? – It can be powered up and start up with no PMBus commands to an output voltage set by a resistor from the VSET pin to AGND. You can short VSET pin to AGND (no resistor required) and this sets the default output voltage to 0.95V. • What advantages does PMBus offer over a device with a simple I2C? – No need to write a Software Program; you can put together a script by putting PMBus Commands in a sequence and selecting the values in the registers • Do I have to use the Fusion GUI from TI? – Yes, for validation and prototyping; a PMBus command script can be generated for high-volume programming 17 FAQs • Are the efficiencies and thermal performance for the TPS544C25/B25 similar to those for TPS544C20/B20? – The TPS544B20/C20 has lower High-Side FET Rds(on) for slightly higher efficiency in high duty applications (high Vout); the TPS544B25/C25 has lower Low-Side FET Rds(on) for slightly higher efficiency in low duty applications (low Vout) • Despite the same Rdson spec, why does the TPS544C25 have a price premium over the TPS544B25? – The family is designed to support up to 30A load current. The TPS544B25 offers a lower-priced p2p alternative with identical efficiencies as the TPS544C25 up to 20A load. Furthermore, the customer may qualify one member of the family in their system and easily transition to the other without having to re-qualify due to differences in silicon. The TPS544B25/C25 have different Current Limit, OverCurrent FAULT and WARN thresholds. 18 FAQs • Despite needing external compensation and having higher Hi-Side FET Rdson (5.5mOhms vs. 4.5mOhms), why does the TPS544B25/C25 cost more than the TPS544B20/C20? Analyzing overall system performance (and corresponding value) is more meaningful and encouraged rather than individual IC price comparisons. – TPS544C25/B25 offer Frequency Synchronization for EMI/noise control without the need for expensive external filters – TPS544C25/B25 has standard rev 1.2 PMBus VOUT_COMMAND for AVS that requires no MGFR_SPECIFIC Register programming and no firmware change – TPS544C25/B25 has RESET Vout function (SYNC/RESET pin) that resets to the default Output Voltage with no power cycling required – TPS544C25/B25 has PMBus VOUT_TRANSITION_RATE command to control the output voltage slew rate for flexible Margining and Adaptive Voltage Scaling (AVS) – 8 settings – TPS544C25/B25 has 0.5V to 1.5V reference, so there is no need for bottom feedback resistor for ASIC and FPGA core and I/O rails, enabling tighter output voltage accuracy than the TPS544B20/C20 because it eliminates the resistor tolerance as one of the sources for error. 19