LTC3441

PRODUCTION

High Current Micropower Synchronous Buck-Boost DC/DC Converter

Data Sheet Product Selection Table
Part Models
2
1ku List Price
Starting From $4.73
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Part Details

  • Regulated Output with Input Above, Below or Equal to the Output
  • Single Inductor, No Schottky Diodes
  • High Efficiency: Up to 95%
  • 25µA Quiescent Current in Burst Mode® Operation
  • Up to 1.2A Continuous Output Current from a Single Lithium-Ion
  • True Output Disconnect in Shutdown
  • 2.4V to 5.5V Input Range
  • 2.4V to 5.25V Output Range
  • 1MHz Fixed Frequency Operation
  • Synchronizable Oscillator
  • Selectable Burst Mode or Fixed Frequency Operation
  • <1µA Quiescent Current in Shutdown
  • Small, Thermally Enhanced 12-Lead (4mm × 3mm) DFN package
LTC3441
High Current Micropower Synchronous Buck-Boost DC/DC Converter
Li-Ion to 3.3V at 1A Buck-Boost Converter Efficiency vs VIN Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 2

Data Sheet

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

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Hardware Ecosystem

Parts Product Life Cycle Description
Silicon Oscillators 2
LTC6908
Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
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:

  • LTC3441
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
DC773A

LTC3441EDE Demo Board | Sync Buck-Boost White LED Driver, 3V ≤ VIN ≤ 4.2V, VLED = 3.9V @ 1A

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Product Details

Demonstration circuit 773 is a synchronous buck-boost white LED driver featuring the LTC3441 and LTC2050. The board is optimized for 3.9V LED forward voltage output at 1000mA load current and a single lithium-ion input voltage range of 3V to 4.2V. the demo board drives a Luxeon III white LED (included on-chip). With its high 1MHz switching frequency, synchronous buck-boost internal power switches, low quiescent current and thermally enhanced package, the LTC3441 is a very versatile and powerful IC for driving high power white LEDs like the Luxeon III from a lithium-ion battery. The LTC2050 is used for constant current control and to adjust the LED current.  


The LED pushbutton is used to manually turn on the LED. The SHDN terminal can be used to program pulses of light from an external source for certain flash applications. The DIM terminal can be used to program the LED for dimmer operation than 1A LED current using a external PWM signal. 

eval board
schematic 2
DC625A

LTC3441EDE | 1MHz, 1A, Synchronous Buck-Boost Converter, 2.5V to 5.5VIN, 3.3VOUT @ 1A

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Product Details

Demonstration Circuit 625 is a constant-frequency synchronous Buck-Boost converter using the LTC3441. The input range is from 2.4V to 5.5V, making it ideal for single-cell lithium-ion or three-cell NiCd/NiMH battery applications. This converter provides up to 95% efficiency, much higher than traditional Buck-Boost converters. For 2.5V minimum input voltage, this converter can provide up to 1A load current. The output voltage is set at 3.3V. A different output voltage in the range of 2.4V to 5.25V can be obtained by changing one of the feedback resistors. The switching frequency is set at 1MHz, which is a good trade-off between efficiency and size.
DC773A
LTC3441EDE Demo Board | Sync Buck-Boost White LED Driver, 3V ≤ VIN ≤ 4.2V, VLED = 3.9V @ 1A
DC773A - Schematic
DC625A
LTC3441EDE | 1MHz, 1A, Synchronous Buck-Boost Converter, 2.5V to 5.5VIN, 3.3VOUT @ 1A
DC625A - Schematic

Latest Discussions

2 Years Ago
RE: Low Voltage Output on LTC3441 in 5V regulated simulation
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