LM25117

ACTIVE

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

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 41 Iout (Max) (A) 20 Regulated outputs (#) 1 Number of Phases 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 750 Iq (Typ) (mA) 4.8 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO Adjustable 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 WQFN (RTW) 24 16 mm² 4 x 4 open-in-new Find other Buck controllers (external switch)

Features

  • 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

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Description

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

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$75.00
Description

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 (...)

Design tools & simulation

SIMULATION MODELS Download
SNVM385.ZIP (51 KB) - PSpice Model
SIMULATION MODELS Download
SNVM386A.ZIP (167 KB) - PSpice Model
SIMULATION MODELS Download
SNVM488A.TSC (148 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM489A.ZIP (8 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVM490.TSC (196 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM491.TSC (226 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM492.ZIP (19 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVM860.ZIP (6 KB) - PSpice Model
SIMULATION MODELS Download
SNVM864.ZIP (2 KB) - PSpice Model
CALCULATION TOOLS Download
LM(2)5117 Quick Start Calculator
LM25117-5117QUICK-CALC

Reference designs

REFERENCE DESIGNS Download
Automotive Input Dual Port USB Type C Charger Reference Design
PMP11114 PMP11114 is a dual port USB Type C Charger. This design takes an automotive input voltage (7V to 18V nominal, load dump to 40V).  The output goes to two USB Type ports, each of these ports supplies 5V.  The desgin supports 3A on one port and 1.5A on the other port.  The DC/DC portion (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
432W High-Efficiency Single-Phase Synchronous Buck Converter Reference Design
PMP10509 PMP10509 is a High-Efficiency Single-Phase Synchronous Buck Converter using the LM25117 controller IC. The design accepts an input voltage of 30.4Vin to 33.6Vin (32Vin Nominal) and provides an output of 24Vout capable of supplying 18A of continuous current to the load.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
300W High-Efficiency Single-Phase Synchronous Buck Converter Reference Design
PMP10514 PMP10514 is a High-Efficiency Single-Phase Synchronous Buck Converter using the LM25117 controller IC. The design accepts an input voltage of 30.4Vin to 33.6Vin (32Vin Nominal) and provides an output of 20 Vout capable of supplying 15A of continuous current to the load.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive USB Charger
PMP6934 — This is a synchronous buck running off automotive 12 volts which supplies 5 volts at 5 amps. The 5 volts is then passed through two TPS2543 charging port power switches.
Design files
REFERENCE DESIGNS Download
8V-40V Input 5V/10A Synchronous Buck for Automotive Applications
PMP7872 — PMP7872 is a synchronous buck converter capable of 50W output power. This design uses the LM25117QPSQ emulated current-mode synchronous buck controller and AUIRLR2905Z MOSFETs for automotive applications.

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options
WQFN (RTW) 24 View options

Ordering & quality

Support & training

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Videos

LM5117 Wide Input Sync Buck with Current Monitor

Eric demonstrates TI's LM5117 wide input synchronous buck controller with average output current monitoring.

Posted: 06-Mar-2012
Duration: 04:24

Visit the LM5117 product folder

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