LTC3403

PRODUCTION

1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor

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Overview

  • Dynamically Adjustable Output from 0.3V to 3.5V
  • Very Low Quiescent Current: Only 20µA During Operation
  • 600mA Output Current
  • Internal P-Channel MOSFET Bypass Transistor
  • High Efficiency: Up to 96%
  • 1.5MHz Constant Frequency Operation
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • 2.5V to 5V Input Voltage Range
  • Drives Optional External P-Channel MOSFET
  • Shutdown Mode Draws < 1µA Supply Current
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Overtemperature Protected
  • Available in 8-Lead 3mm x 3mm DFN Package

The LTC3403 is a high efficiency monolithic synchronous buck regulator optimized for WCDMA power amplifier applications. The output voltage can be dynamically programmed from 0.3V to 3.5V. At VOUT > 3.6V an internal bypass P-channel MOSFET connects VOUT directly to VIN, eliminating power loss through the inductor. Selectable forced continuous mode enables fast VOUT response to the controlling input.

Supply current is only 20µA in Burst Mode® operation and drops to <1µA in shutdown. The 2.5V to 5V input voltage range makes the LTC3403 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.

Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode.

The LTC3403 is available in a low profile 8-lead 3mm x 3mm DFN package.

Applications

  • WCDMA Cell Phone Power Amplifiers
  • Wireless Modems

LTC3403
1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor
Figure 1a. WCDMA Transmitter Power Supply Figure 1b. Efficiency vs Output Current Product Package 1
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Documentation

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
Power System Management (PSM) & Sequencers 1
LTC2974 RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Supervisory Circuits & Reset ICs 1
LTC2934 PRODUCTION Ultra-Low Power Adjustable Supervisor with Power-Fail Output
Switching Regulators & Controllers 1
LTC3880 RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice


Models for the following parts are available in LTspice:

  • LTC3403

LTpowerCAD 1


Design tools for the following parts are available in LTpowerCAD:

  • LTC3403
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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.


Evaluation Kits

eval board
DC560A

LTC3403EDD | WCDMA Cellular Phone Buck Regulator, 2.7V to 5V Input, Output @ 600mA

Product Details

DC560A: Demo Board for the LTC3403 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor.


 


DC560A
LTC3403EDD | WCDMA Cellular Phone Buck Regulator, 2.7V to 5V Input, Output @ 600mA
DC560A - Schematic

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