Home Power management DC/DC switching regulators Step-down (buck) regulators Buck converters (integrated switch)

LM20125

ACTIVE

2.95-5.5V, 5A, Current Mode Synchronous Buck Regulator with Optional Automotive Grade

A newer version of this product is available

open-in-new Compare alternates
Similar functionality to the compared device
TPS62816-Q1 ACTIVE Automotive 2.75-V to 6-V, 6-A step-down converter in 2-mm x 3-mm wettable-flanks QFN package Next generation 6-A buck with higher efficiency, lower EMI and a smaller solution size.

Product details

Vin (min) (V) 2.95 Vin (max) (V) 5.5 Vout (min) (V) 0.8 Vout (max) (V) 5 Iout (max) (A) 5 Iq (typ) (mA) 3.5 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Enable, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 85 Type Converter
Vin (min) (V) 2.95 Vin (max) (V) 5.5 Vout (min) (V) 0.8 Vout (max) (V) 5 Iout (max) (A) 5 Iq (typ) (mA) 3.5 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Enable, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 85 Type Converter
HTSSOP (PWP) 16 32 mm² 5 x 6.4
  • LM20125Q is AEC-Q100 Qualified and Manufactured on an Automotive Grade Flow
  • Input Voltage Range 2.95V to 5.5V
  • Accurate Current Limit Minimizes Inductor Size
  • 97% Efficiency with 500 kHz Switching Frequency
  • 32 mΩ Integrated FET Switches
  • Starts up into Pre-Biased Loads
  • Output Voltage Tracking
  • Peak Current Mode Control
  • Adjustable Output Voltage Down to 0.8V
  • Adjustable Soft-Start with External Capacitor
  • Precision Enable Pin with Hysteresis
  • Integrated OVP, UVLO, Power Good and Thermal Shutdown
  • HTSSOP 16-Pin Exposed Pad Package

All trademarks are the property of their respective owners.

  • LM20125Q is AEC-Q100 Qualified and Manufactured on an Automotive Grade Flow
  • Input Voltage Range 2.95V to 5.5V
  • Accurate Current Limit Minimizes Inductor Size
  • 97% Efficiency with 500 kHz Switching Frequency
  • 32 mΩ Integrated FET Switches
  • Starts up into Pre-Biased Loads
  • Output Voltage Tracking
  • Peak Current Mode Control
  • Adjustable Output Voltage Down to 0.8V
  • Adjustable Soft-Start with External Capacitor
  • Precision Enable Pin with Hysteresis
  • Integrated OVP, UVLO, Power Good and Thermal Shutdown
  • HTSSOP 16-Pin Exposed Pad Package

All trademarks are the property of their respective owners.

The LM20125 is a full featured 500 kHz synchronous buck regulator capable of delivering up to 5A of continuous output current. The current mode control loop can be compensated to be stable with virtually any type of output capacitor. For most cases, compensating the device only requires two external components, providing maximum flexibility and ease of use. The device is optimized to work over the input voltage range of 2.95V to 5.5V making it suited for a wide variety of low voltage systems.

The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for increased system reliability. A precision enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault detection and supply sequencing is possible with the integrated power good circuit.

The LM20125 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20125 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20125 is offered in a 16-pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks.

The LM20125 is a full featured 500 kHz synchronous buck regulator capable of delivering up to 5A of continuous output current. The current mode control loop can be compensated to be stable with virtually any type of output capacitor. For most cases, compensating the device only requires two external components, providing maximum flexibility and ease of use. The device is optimized to work over the input voltage range of 2.95V to 5.5V making it suited for a wide variety of low voltage systems.

The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for increased system reliability. A precision enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault detection and supply sequencing is possible with the integrated power good circuit.

The LM20125 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20125 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20125 is offered in a 16-pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Similar functionality to the compared device
LM20136 ACTIVE 2.95-5.5V, 6A, Current Mode Synchronous Buck Regulator with Input Synchronization Higher Iout (6 A) and input frequency synchronization pin.

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 7
Type Title Date
* Data sheet LM20125/LM20125Q 5A, 500kHz PowerWise ® Synchronous Buck Regulator datasheet (Rev. E) 27 Mar 2013
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
EVM User's guide AN-1687 LM20125 Evaluation Board (Rev. B) 03 May 2013
Application note AN-1752 5A LM20k Reference Designs (Rev. C) 03 May 2013
Application note AN-2077 LM20k POL Module (Rev. A) 03 May 2013
Application note Power Supply Design Considerations for Modern FPGAs (Power Designer 121) 02 Feb 2010
EVM User's guide AN-1687 LM20125 Evaluation Board (Rev. A) 30 Oct 2007

Design & development

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

Evaluation board

LM20125EVAL — 5A, 500kHz PowerWise® Synchronous Buck Regulator Evaluation Module

The LM20125 is a full featured buck switching regulator capable of driving up to 5A of load current. The nominal 500 kHz switching frequency of the LM20125 reduces the size of the power stage components while still allowing for highly efficient operation. The LM20125 is capable of converting an (...)

User guide: PDF
Not available on TI.com
Simulation model

LM20125 TINA-TI Average Reference Design

SNVM627.TSC (1008 KB) - TINA-TI Reference Design
Simulation model

LM20125 TINA-TI Average Spice Model

SNVM626.ZIP (8 KB) - TINA-TI Spice Model
Simulation model

LM20125 TINA-TI Transient Reference Design

SNVM629.TSC (53 KB) - TINA-TI Reference Design
Simulation model

LM20125 TINA-TI Transient Spice Model

SNVM628.ZIP (11 KB) - TINA-TI Spice Model
Calculation tool

LM20125DESIGN-CALC — LM20125 Design Spreadsheet

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Package Pins Download
HTSSOP (PWP) 16 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos