LM3478

ACTIVE

2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller

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Product details

Parameters

Vin (Min) (V) 2.97 Vin (Max) (V) 40 Vout (Min) (V) 1.26 Vout (Max) (V) 500 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 2.7 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Pre-Bias Start-Up Duty cycle (Max) (%) 100 Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Boost controllers (external switch)

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Boost controllers (external switch)

Features

  • 8-lead VSSOP-8 and SOIC-8 packages
  • Internal Push-Pull Driver With 1-A Peak Current Capability
  • Current Limit and Thermal Shutdown
  • Frequency Compensation Optimized With a Capacitor and a Resistor
  • Internal Soft Start
  • Current Mode Operation
  • Undervoltage Lockout With Hysteresis
  • Create a Custom Design Using the LM3478 with the WEBENCH Power Designer

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Description

The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.

The LM3478 has built-in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

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Technical documentation

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Type Title Date
* Datasheet LM3478 High-Efficiency Low-Side N-Channel Controller for Switching Regulator datasheet (Rev. X) Feb. 28, 2017
Application notes LM34xx How to Design Flyback Converter with LM3481 Boost Controller (Rev. A) Apr. 08, 2019
Technical articles How to add overvoltage protection to a synchronous boost controller Sep. 17, 2018
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application notes Softstart Using Constant Current Constant Voltage Approach Jul. 24, 2015
Technical articles Portable speaker power: Making the bass possible May 12, 2015
Application notes Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co Jul. 11, 2014
User guides AN-1204 LM3478/LM3488 Evaluation Board (Rev. A) Oct. 30, 2013
Application notes AN-1286 Compensation For The LM3478 Boost Controller (Rev. C) Apr. 23, 2013
Application notes AN-1484 Designing A SEPIC Converter (Rev. E) Apr. 23, 2013
Application notes AN-1990 Compensation for Current Mode Control SEPIC Converters (Rev. A) Apr. 23, 2013
Application notes Modeling & Design of Current Mode Control Boost Converters (Rev. B) Apr. 23, 2013
More literature Die D/S LM3478 MDC Hi Efficiency Low-Side N-Chan Controller For Switching Reg Sep. 25, 2012

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
79
Description

High Efficiency Low-Side N-Channel Controller for Switching Regulator

Features
  • 8-lead Mini-SO8 (MSOP-8) package
  • Internal push-pull driver with 1A peak current capability
  • Curent limit and thermal shutdown
  • Frequency compensation optimized with a capacitor and a resistor
  • Internal soft start
  • Current mode operation
  • Undervoltage lockout with hysteresis

 

Design tools & simulation

SIMULATION MODELS Download
SNVMAW8C.ZIP (124 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAW9B.ZIP (5 KB) - PSpice Model
SIMULATION MODELS Download
SNVMB83A.TSC (98 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMB84A.ZIP (9 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVMBH8.ZIP (170 KB) - PSpice Model
SIMULATION MODELS Download
SNVMBL8.ZIP (2 KB) - PSpice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOLS Download
Fly-Buck and Flyback Topology Selector
FLYBUCK-FLYBACK-DESIGN-CALC This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
Features
  • Features isolated topologies like Fly-Buck™, Fly-Buck-Boost, DCM and CCM Flyback
  • Capability to design up to 6 isolated outputs
  • Recommends ICs for desired application design
  • Incorporates loop compensation in designs
  • Compares efficiency, external component count and transformer currents for every topology (...)

Reference designs

REFERENCE DESIGNS Download
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document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
EEPROM Programming Tool Reference Design
TIDA-01373 — The TIDA-01373 is a reference hardware and software example of a scalable programming tool for the DRV10983, DRV10975, DRV10983-Q1, and DRV10987 integrated BLDC motor drivers. These devices feature configurable EEPROM registers that need to be set to motor-specific parameters. This reference design (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Voltage Ratio Vout/Vin, 2W Boost Converter Reference Design
PMP10077 When high voltage ratio between output and input is required, it's always difficult to choose the right topology. In this case, the most-simple Boost has been selected due to cost reasons. The converter runs in DCM mode therefore avoiding the Trr of the diode and shows good efficiency.
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REFERENCE DESIGNS Download
3 LED Driver
PMP7866 — This is an LED driver/converter that can power up to three high output LEDs. It has an input voltage range of 9V-to-16Vin and an output of 10.5Vout @ 1A.

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
VSSOP (DGK) 8 View options

Ordering & quality

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