LM25117-Q1

ACTIVE

Automotive Grade 4.5-42V Wide Vin, Current Mode Synchronous Buck Controller with Tracking

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LM25141-Q1 ACTIVE Automotive 2.2-MHz, low-IQ synchronous buck controller with frequency spread spectrum Improved EMI performance, efficiency and lower IQ.

Product details

Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Buck Controller Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 41 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 4800 Duty cycle (max) (%) 98 Number of phases 1
Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Buck Controller Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 41 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 4800 Duty cycle (max) (%) 98 Number of phases 1
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4 WQFN (RTW) 24 16 mm² 4 x 4
  • LM25117-Q1 is Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range
  • Emulated Peak Current Mode Control
  • Wide Operating Range from 4.5 V to 42 V
  • Robust 3.3 A Peak Gate Drives
  • Adaptive Dead-time Output Driver Control
  • Free-run or Synchronizable Clock up to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output from 0.8 V
  • Precision 1.5% Voltage Reference
  • Analog Current Monitor
  • Programmable Current Limit
  • Hiccup Mode Over Current Protection
  • Programmable Soft-start and Tracking
  • Programmable Line Undervoltage Lockout
  • Programmable Switch-over to External Bias Supply
  • Thermal Shutdown
  • LM25117-Q1 is Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range
  • Emulated Peak Current Mode Control
  • Wide Operating Range from 4.5 V to 42 V
  • Robust 3.3 A Peak Gate Drives
  • Adaptive Dead-time Output Driver Control
  • Free-run or Synchronizable Clock up to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output from 0.8 V
  • Precision 1.5% Voltage Reference
  • Analog Current Monitor
  • Programmable Current Limit
  • Hiccup Mode Over Current Protection
  • Programmable Soft-start and Tracking
  • Programmable Line Undervoltage Lockout
  • Programmable Switch-over to External Bias Supply
  • Thermal Shutdown

The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

The operating frequency is programmable from 50 kHz to 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.

The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

The operating frequency is programmable from 50 kHz to 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.

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Technical documentation

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Type Title Date
* Data sheet LM25117/Q1 Wide Input Range Synchronous Buck Controller With Analog Current Monitor datasheet (Rev. F) PDF | HTML 27 Aug 2015
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 03 Jul 2018
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
User guide AN-2065 LM5119 Evaluation Board (Rev. B) 24 Apr 2013
User guide AN-2103 LM5117 Evaluation Board (Rev. B) 24 Apr 2013

Design & development

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

Evaluation board

LM25117EVAL — LM25117 Wide Vin Synchronous Buck Controller Evaluation Board

The LM25117 evaluation board provides the design engineer with a fully functional synchronous buck converter based on Emulated Current Mode Control to evaluate the LM25117 controller IC. The evaluation board provides 3.3V output with a 9A current capability in addition with average output current (...)

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

LM25117 PSpice Average Model

SNVM385.ZIP (51 KB) - PSpice Model
Simulation model

LM25117 PSpice Transient Model (Rev. A)

SNVM386A.ZIP (167 KB) - PSpice Model
Simulation model

LM25117 TINA-TI Average Reference Design (Rev. A)

SNVM488A.TSC (148 KB) - TINA-TI Reference Design
Simulation model

LM25117 TINA-TI Average Spice Model (Rev. A)

SNVM489A.ZIP (8 KB) - TINA-TI Spice Model
Simulation model

LM25117 TINA-TI Transient Reference Design(Load transient)

SNVM490.TSC (196 KB) - TINA-TI Reference Design
Simulation model

LM25117 TINA-TI Transient Reference Design(START UP)

SNVM491.TSC (226 KB) - TINA-TI Reference Design
Simulation model

LM25117 TINA-TI Transient Spice Model

SNVM492.ZIP (19 KB) - TINA-TI Spice Model
Simulation model

LM25117 Unencrypted PSpice Average Model

SNVM864.ZIP (2 KB) - PSpice Model
Simulation model

LM25117 Unencrypted PSpice Transient Model

SNVM860.ZIP (6 KB) - PSpice Model
Calculation tool

LM25117-5117QUICK-CALC — LM(2)5117 Quick Start Calculator

Reference designs

TIDA-00675 — Power Reduction Using Dynamic Switching Reference Design

The TIDA-00675 shows the power reduction benefits of dynamically switching a load on/off using a load switch. The design guide shows how frequency of switching, duty cycle, and the use of a discharge resistor can have an impact on power consumption.
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00160 — Automotive USB Charger with Linear Droop Compensation Reference Design

The TIDA-00160 reference design provides detailed data for evaluating and verifying a USB charger, which uses a USB charge controller, a buck controller and a shunt amplifier.

This design demonstrates an automotive USB charging port that offers short-to-battery protection. With the help of the shunt (...)

Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 20 Ultra Librarian
WQFN (RTW) 24 Ultra Librarian

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  • Ongoing reliability monitoring
Information included:
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