LT3480

PRODUCTION

36V, 2A, 2.4MHz Step-Down Switching Regulator with 70µA Quiescent Current

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Overview

  • Wide Input Range:
    • Operation from 3.6V to 36V
    • Over-Voltage Lockout Protects Circuits through 60V Transient
  • 2A Maximum Output Current
  • Low Ripple Burst Mode® Operation
    • 70µA IQ at 12VIN to 3.3VOUT
    • Output Ripple < 15mV
  • Adjustable Switching Frequency: 200kHz to 2.4MHz
  • Low Shutdown Current: IQ < 1µA
  • Integrated Boost Diode
  • Synchronizable Between 250kHz to 2MHz
  • Power Good Flag
  • Saturating Switch Design: 0.25Ω On-Resistance
  • 0.790V Feedback Reference Voltage
  • Output Voltage: 0.79V to 20V
  • Soft-Start Capability
  • Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages
LT3480
36V, 2A, 2.4MHz Step-Down Switching Regulator with 70µA Quiescent Current
3.3V Step-Down Converter Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

User Guide 3

Design Note 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Hot Swap Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Ideal Diodes and PowerPath Controllers 1
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
Oscillators 1
LTC6909
PRODUCTION 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3480
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC1091A

LT3480EMSE Demo Board | (MSOP) 6.3V ≤ VIN ≤ 38V (60V Transients), VOUT = 5V @ 2A

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Product Details

Demonstration circuit 1091 is a monolithic step-down switching regulator featuring the LT3480 in the MSOP-10 exposed pad package. The operating frequency can be synchronized up to 2MHz. The demo board is designed for 5V/2A output from a 6.3V to 38V input with transients up to 60V. The wide input range of the LT3480 allows a variety of input sources. The typical sources are automotive batteries, wall adaptors and industrial supplies. The modes of operation (Burst Mode and fixed frequency) are jumper selectable.

eval board
schematic 2
DC1394A

LT3480 HV Buck Regulator Board with Plug in Interface

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Product Details

Demonstration Circuit 1394A shows how the LT3480 high voltage step-down regulator can be used with the LTC4098 USB-compatible Li-Ion battery charger to design a 2 input source battery charger circuit that also provides power to the load from the LT3480, a 5V wall adapter or the batteries based on available power. The LTC4098 interfaces with a number of ADI switching regulators to provide a high efficiency, high voltage power path. The LT3480 operates from 8V to 38V (60V transients) and provides 2A with a voltage range that is mode and load dependent.

eval board
schematic 3
DC1212A-A

LT3480EDD Demo Board | (DFN) EN55022 Compliant, Micropower, 6.3V ≤ VIN ≤ 38V (60V Transients), VOUT = 5V at 2A

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Product Details

Demonstration circuit 1212A-A is a monolithic step-down DC/DC switching regulatro featuring the LT3480 in the 3 × 3 DFN-10 package. The demo board provides 5V at 2A from a 6.3V to 38V input and has transient protection up to 60V. The demo boards default switching frequency is 800kHz, but the LT3480 has a SYNC pin which allows frequency synchronization to an external clock over a 250kHz to 2MHz range. The LT3480's quiescent current is 70uA, while the LT3685 has a 0.9mA quiescent current. 


An EMC filter at the input makes the circuit compatible with EMC standard EN55022 Class B.
DC1091A
LT3480EMSE Demo Board | (MSOP) 6.3V ≤ VIN ≤ 38V (60V Transients), VOUT = 5V @ 2A
DC1091A - Schematic
DC1394A
LT3480 HV Buck Regulator Board with Plug in Interface
DC1394A - Schematic
DC1212A-A
LT3480EDD Demo Board | (DFN) EN55022 Compliant, Micropower, 6.3V ≤ VIN ≤ 38V (60V Transients), VOUT = 5V at 2A
DC1212A-A - Schematic

Reference Designs

DK-VIDEO-4SGX230N Dev Kit
DK-VIDEO-4SGX230N Dev Kit
LTC Parts List
DK-VIDEO-4SGX230N Block Diagram
DK-VIDEO-4SGX230N Power Tree
Altera Audio Video Development Kit, Stratix IV GX Edition Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
Altera Audio Video Development Kit, Stratix IV GX Edition
DK-VIDEO-4SGX230N Dev Kit
LTC Parts List
DK-VIDEO-4SGX230N Block Diagram
DK-VIDEO-4SGX230N Power Tree

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