LTC3444

RECOMMENDED FOR NEW DESIGNS

Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications

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Overview

  • Optimized Features for WCDMA Handsets
  • Regulated Output with Input Voltages Above, Below, or Equal to the Output
  • 0.5V to 5V Output Range
  • Up to 400mA Continuous Output Current From a Single Lithium-Ion Cell
  • Minimal External Components
  • 1.5MHz Fixed Frequency Operation
  • Internal Loop Compensation for Fast Response <25μs Full Scale Output Slewing; COUT 4.7μF
  • Output Disconnect in Shutdown
  • 2.75V to 5.5V Input
  • <1μA Shutdown Current
  • Internal Soft-Start
  • Output Overvoltage Protection
  • Single Inductor, No Schottky Diodes Required
  • Small, Thermally Enhanced 8-Lead (3mm × 3mm) DFN Package

The LTC3444 is a highly efficient, fixed frequency, buck-boost DC/DC converter, which operates from input voltages above, below, and equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for a single Lithium-Ion or multi-cell applications where the output voltage can vary over a wide range.

The LTC3444 has been optimized for use in 3G WCDMA applications. A unique design yields high efficiency at very low output voltages while also eliminating external components. The high speed error amplifier provides the fast transient response required to slew the RF power amplifier from standby to transmit and transmit to stand by power levels. Output overvoltage protection protects the RF power amplifier.

Operating frequency is internally set to 1.5MHz to minimize external component size while maximizing efficiency.

Other features include <1μA shutdown current, internal soft-start, peak current limit and thermal shutdown. The LTC3444 is available in a small, thermally enhanced 8-lead (3mm × 3mm) DFN package.

Applications

  • WCDMA Applications–3G Handsets with High Speed Data Rate Capability
  • MP3 Players
  • Digital Cameras
LTC3444
Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications
LTC3444 Dynamic Response Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3444
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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
DC901A

LTC3444EDD Demo Board | Synchronous Buck-Boost, for CDMA & HSDPA, 3.1V ≤ VIN ≤ 5V, VOUT = 0.8V to 4.2V @ 400mA

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Product Details

Demonstration circuit 901A features the LTC3444 and is a highly efficient, 1.5MHz fixed frequency buck-boost DC/DC converter. The input voltage can range from 3.1V to 5.0V and is suitable for Li-Ion or three-cell NiCd/NiMH battery applications while the output voltage can be set anywhere from 0.8V to 4.2V by injecting a 0.35V to 2.4V control signal. The demo board provides up to 400mA of output current.
DC901A
LTC3444EDD Demo Board | Synchronous Buck-Boost, for CDMA & HSDPA, 3.1V ≤ VIN ≤ 5V, VOUT = 0.8V to 4.2V @ 400mA
DC901A - Schematic

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