LTC3409A

PRODUCTION

600mA Low VIN Buck Regulator in 3mm × 3mm DFN

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Overview

  • 1.6V to 5.5V Input Voltage Range
  • 0.62V to 5.5V Output Voltage Range
  • Internal Soft-Start
  • Selectable 1.7MHz or 2.6MHz Constant Frequency Operation
  • Internal Oscillator Can Be Synchronized to an External Clock, 1MHz to 3MHz Range
  • High Efficiency: Up to 95%
  • 65μA Quiescent Current, Burst Mode® Operation
  • 600mA Output Current (VIN = 1.8V, VOUT = 1.2V)
  • 750mA Peak Inductor Current
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • 0.612V Reference Voltage
  • Stable with Ceramic Capacitors
  • Shutdown Mode Draws <1μA Supply Current
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Overtemperature Protection
  • Available in a Low Profile (0.75mm)
  • 8-Lead (3mm × 3mm) DFN Package

The LTC3409A is a high efficiency, monolithic synchronous buck regulator using a constant frequency, current mode architecture. The LTC3409A improves upon the LTC3409’s light load regulation in Burst Mode operation. The output voltage is adjusted via an external resistor divider.

Fixed switching frequencies of 1.7MHz and 2.6MHz are supported. Alternatively, an internal PLL will synchronize to an external clock in the frequency range of 1MHz to 3MHz. This range of switching frequencies allows the use of small surface mount inductors and capacitors, including ceramics.

 Supply current during Burst Mode operation is only 65μA dropping to <1μA in shutdown. The 1.6V to 5.5V input voltage range makes the LTC3409A ideally suited for single cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd or NiMH battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. Burst Mode operation can be user-enabled, increasing efficiency at light loads, further extending battery life.

The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Internal soft-start offers controlled output voltage rise time at startup without the need for external components.

VREF Tolerance
LTC3409 VREF Tolerance
LTC3409A ±3%

Applications

  • Cellular Phones
  • Digital Cameras
  • MP3 Players
LTC3409A
600mA Low VIN Buck Regulator in 3mm × 3mm DFN
High Efficiency Step-Down Converter Burst Mode Efficiency, 1.8VOUT Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Data Sheet

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Software Resources

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Hardware Ecosystem

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3409

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

  • LTC3409
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.

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