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TPS543B25E

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4V to 18V input, 25A synchronous SWIFT™ step-down converter with extended temperature

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Data sheet

TPS543B25E

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck, Synchronous Buck Iout (max) (A) 25 Vin (max) (V) 18 Vin (min) (V) 4 Vout (max) (V) 7 Vout (min) (V) 0.5 Features Adjustable current limit, Differential Remote Sense, Enable, Forced PWM, Frequency synchronization, Overcurrent protection, Power good, Prebias startup, Soft-start adjustable, Synchronous rectification, UVLO adjustable Control mode ACM/AECM Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 2200 Operating temperature range (°C) -55 to 150 Iq (typ) (µA) 1200 Duty cycle (max) (%) 94 Type Converter
Rating Catalog Topology Buck, Synchronous Buck Iout (max) (A) 25 Vin (max) (V) 18 Vin (min) (V) 4 Vout (max) (V) 7 Vout (min) (V) 0.5 Features Adjustable current limit, Differential Remote Sense, Enable, Forced PWM, Frequency synchronization, Overcurrent protection, Power good, Prebias startup, Soft-start adjustable, Synchronous rectification, UVLO adjustable Control mode ACM/AECM Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 2200 Operating temperature range (°C) -55 to 150 Iq (typ) (µA) 1200 Duty cycle (max) (%) 94 Type Converter
WQFN-FCRLF (RYS) 17 11.25 mm² 4.5 x 2.5
  • Fixed-frequency, internally-compensated, advanced current mode (ACM) control
  • Integrated 6.5mΩ and 2mΩ MOSFETs
  • 4V to 18V input voltage range
  • 0.5V to 7V output voltage range
  • True differential remote sense amplifier (RSA)
  • Three selectable PWM ramp options to optimize the control loop performance
  • Five selectable switching frequencies: 500kHz, 750kHz, 1MHz, 1.5MHz, and 2.2MHz
  • Synchronizable to an external clock
  • 0.5V, ±0.5% voltage reference accuracy over full temperature range
  • 1ms, 2ms, 4ms, and 8ms selectable soft-start times
  • Monotonic start-up into prebiased outputs
  • Selectable current limits to support 25A and 20A operation
  • Enable with adjustable input undervoltage lockout
  • Power-good output monitor
  • Output overvoltage, output undervoltage, input undervoltage, overcurrent, and overtemperature protection
  • –55°C to 150°C operating junction temperature
  • 2.5mm × 4.5mm, 17-pin WQFN-FCRLF package with 0.5mm pitch
  • Lead-free (RoHS compliant)
  • Pin compatible with the 20A - TPS543B22, 16A - TPS543A26, and 12A - TPS543A22
  • SIMPLIS models available
  • Create a custom design using the TPS543B25E with the WEBENCH Power Designer
  • Fixed-frequency, internally-compensated, advanced current mode (ACM) control
  • Integrated 6.5mΩ and 2mΩ MOSFETs
  • 4V to 18V input voltage range
  • 0.5V to 7V output voltage range
  • True differential remote sense amplifier (RSA)
  • Three selectable PWM ramp options to optimize the control loop performance
  • Five selectable switching frequencies: 500kHz, 750kHz, 1MHz, 1.5MHz, and 2.2MHz
  • Synchronizable to an external clock
  • 0.5V, ±0.5% voltage reference accuracy over full temperature range
  • 1ms, 2ms, 4ms, and 8ms selectable soft-start times
  • Monotonic start-up into prebiased outputs
  • Selectable current limits to support 25A and 20A operation
  • Enable with adjustable input undervoltage lockout
  • Power-good output monitor
  • Output overvoltage, output undervoltage, input undervoltage, overcurrent, and overtemperature protection
  • –55°C to 150°C operating junction temperature
  • 2.5mm × 4.5mm, 17-pin WQFN-FCRLF package with 0.5mm pitch
  • Lead-free (RoHS compliant)
  • Pin compatible with the 20A - TPS543B22, 16A - TPS543A26, and 12A - TPS543A22
  • SIMPLIS models available
  • Create a custom design using the TPS543B25E with the WEBENCH Power Designer

The TPS543B25E is a high-efficiency, 18V, 25A, synchronous buck converter. The device employs an internally compensated, fixed-frequency, ACM control architecture, which while always operating under forced continuous conduction mode (FCCM), generates output voltages from 0.5V to 7V. The device is capable of providing high efficiency while operating at a switching frequency up to 2.2MHz, making the device an excellent choice for designs requiring a small design size. The fixed frequency controller can operate from 500kHz to 2.2MHz and can be synchronized to an external clock using the SYNC pin. Additional features include a high accuracy voltage reference, two-wire remote sense, selectable soft-start times, monotonic start-up into prebiased outputs, selectable current limits, adjustable undervoltage lockout (UVLO) through the EN pin, and a full suite of fault protections.

The TPS543B25E is available in a small, 2.5mm × 4.5mm, HotRod™ WQFN-FCRLF package.

The TPS543B25E is a high-efficiency, 18V, 25A, synchronous buck converter. The device employs an internally compensated, fixed-frequency, ACM control architecture, which while always operating under forced continuous conduction mode (FCCM), generates output voltages from 0.5V to 7V. The device is capable of providing high efficiency while operating at a switching frequency up to 2.2MHz, making the device an excellent choice for designs requiring a small design size. The fixed frequency controller can operate from 500kHz to 2.2MHz and can be synchronized to an external clock using the SYNC pin. Additional features include a high accuracy voltage reference, two-wire remote sense, selectable soft-start times, monotonic start-up into prebiased outputs, selectable current limits, adjustable undervoltage lockout (UVLO) through the EN pin, and a full suite of fault protections.

The TPS543B25E is available in a small, 2.5mm × 4.5mm, HotRod™ WQFN-FCRLF package.
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* Data sheet TPS543B25E 4V to 18V Input, 25 A, Synchronous, SWIFT Step-Down Converter With Internally Compensated, Advanced Current Mode Control datasheet PDF | HTML 30 Jul 2025

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS543B22EVM — TPS543B22 synchronous buck converter evaluation module

The TPS543B22 evaluation module (EVM) a synchronous buck converter, integrating both power MOSFETs with low drain to source resistance to minimize solution size and provides high efficiency at full load. The TPS543B22EVM uses fixed frequency advanced current mode control with low minimum on-time (...)
User guide: PDF | HTML
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Simulation model

TPS543B22 SIMPLIS Transient and Average Model (Rev. A)

SLVMDY4A.ZIP (928 KB) - SIMPLIS Model
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WQFN-FCRLF (RYS) 17 Ultra Librarian
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