6-42V Wide Vin, Current Mode Synchronous Buck Controller


Product details


Vin (Min) (V) 6 Vin (Max) (V) 42 Vout (Min) (V) 1.215 Vout (Max) (V) 36 Iout (Max) (A) 20 Regulated outputs (#) 1 Number of Phases 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 4.6 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Synchronous Rectification Duty cycle (Max) (%) 98 Operating temperature range (C) -40 to 125 Type Controller Rating Catalog Control mode Current Mode open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Buck controllers (external switch)


  • Emulated Peak Current Mode
  • Wide Operating Range (Up to 42 V)
  • Low IQ Shutdown (< 10 µA)
  • Drives Standard or Logic Level MOSFETs
  • Robust 3.5-A Peak Gate Drive
  • Free-Run or Synchronous Operation to 1 MHz
  • Optional Diode Emulation Mode
  • Programmable Output From 1.215 V to 36 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Programmable Soft Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switch to External Bias Supply
  • 20-Pin HTSSOP Exposed Pad
  • Thermal Shutdown
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The LM25116 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 using an emulated current ramp. Current mode control provides inherent line feedforward, 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 1 MHz. The LM25116 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 low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit and adjustable line undervoltage lockout. The device is available in a power enhanced 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

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Technical documentation

Design & development

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Hardware development

document-generic User guide

The LM25116 evaluation board is designed to provide the design engineer with a fully functional power converter based on Emulated Current Mode Control to evaluate the LM25116 controller IC. The evaluation board provides a 5V output with a 7A current capability. The wide input voltage ranges from 7V (...)

  • Emulated peak current mode
  • Wide operating range up to 42V
  • Low IQ Shutdown (<10µA)
  • Drives standard or logic level MOSFETs
  • Robust 3.5A peak gate drive
  • Free-run or synchronous operation to 1MHz
  • Optional diode emulation mode
  • Programmable output from 1.215V to 36V
  • Precision 1.5% voltage reference
  • Programmable (...)

Design tools & simulation

SNVM353.ZIP (222 KB) - PSpice Model
SNVM354.ZIP (58 KB) - PSpice Model
SNVM862.ZIP (3 KB) - PSpice Model
SNVM863.ZIP (2 KB) - PSpice Model
LM(2)5116/WG Quick Start Component Calculator

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

Ordering & quality

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