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LM61440

ACTIVE

3-V to 36-V, 4-A, low-noise synchronous step-down converter

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Data sheet

LM61440

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck Iout (max) (A) 4 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 34 Vout (min) (V) 1 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, Synchronous Rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000007 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
Rating Catalog Topology Buck Iout (max) (A) 4 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 34 Vout (min) (V) 1 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, Synchronous Rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000007 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
VQFN-HR (RJR) 14 14 mm² (4 mm × 3.5 mm)
  • Functional Safety-Capable
  • Optimized for ultra low EMI requirements
    • Hotrod™ package and parallel input path minimize switch node ringing
    • Parallel input path minimizes parasitic inductance
    • Adjustable SW node rise time
  • Designed for reliable and rugged applications
    • Supports 42-V transients
    • ±1% total output regulation accuracy
    • VOUT adjustable from 1 V to 95% of VIN
    • 0.3-V dropout with 3-A load (typical)
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
    • Low MOSFET ON resistance
      • RDS_ON_HS = 41 mΩ (typical)
      • RDS_ON_LS = 21 mΩ (typical)
    • External bias option for improved efficiency
  • Suitable for scalable power supplies
    • Pin compatible with:
  • Functional Safety-Capable
  • Optimized for ultra low EMI requirements
    • Hotrod™ package and parallel input path minimize switch node ringing
    • Parallel input path minimizes parasitic inductance
    • Adjustable SW node rise time
  • Designed for reliable and rugged applications
    • Supports 42-V transients
    • ±1% total output regulation accuracy
    • VOUT adjustable from 1 V to 95% of VIN
    • 0.3-V dropout with 3-A load (typical)
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
    • Low MOSFET ON resistance
      • RDS_ON_HS = 41 mΩ (typical)
      • RDS_ON_LS = 21 mΩ (typical)
    • External bias option for improved efficiency
  • Suitable for scalable power supplies
    • Pin compatible with:

The LM61440 is a high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 A of output current is delivered over a wide input range of 3.0 V to 36 V; tolerant of 42 V, easing input surge protection design. The LM61440 implements soft recovery from dropout eliminating overshoot on the output.

The LM61440 is specifically designed for minimal EMI. The device incorporates adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be set or synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.

Electrical characteristics are specified over a junction temperature range of –40°C to +150°C. Find additional resources in the Related Documentation.

The LM61440 is a high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 A of output current is delivered over a wide input range of 3.0 V to 36 V; tolerant of 42 V, easing input surge protection design. The LM61440 implements soft recovery from dropout eliminating overshoot on the output.

The LM61440 is specifically designed for minimal EMI. The device incorporates adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be set or synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.

Electrical characteristics are specified over a junction temperature range of –40°C to +150°C. Find additional resources in the Related Documentation.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM61440 3-V to 36-V, 4-A, Low EMI Synchronous Step-Down Converter datasheet (Rev. C) PDF | HTML Jun 22, 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr 8, 2021
Functional safety information LM61x0 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML Oct 8, 2020

Design & development

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

Evaluation board

LM61460EVM — 36-V, low EMI 6-A, 5-V synchronous, 400-kHz, step-down converter evaluation module

The LM61460 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM61460 synchronous step-down converter.  The LM61460 provides exceptional efficiency, low IQ, and low EMI in small solution size.
User guide: PDF | HTML
Supported products & hardware
Simulation model

LM61440AAN PSpice Transient Model

SNVMBY8.ZIP (142 KB) - PSpice model
Supported products & hardware
Simulation model

LM61440AAN-Q1 PSpice Transient Model

SNVMBZ0.ZIP (142 KB) - PSpice model
Supported products & hardware
Calculation tool

SNVR479 — LM61460 Design Tool

Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
VQFN-HR (RJR) 14 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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