LTC3452
Info: : PRODUCTION
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LTC3452

Synchronous Buck-Boost MAIN/CAMERA White LED Driver

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.19
Features
  • High Efficiency: ≥85% Over Entire Li-Ion Battery Range
  • Wide VIN Range: 2.7V to 5.5V
  • Independent MAIN/CAMERA Current Control
  • Up to 425mA Continuous Output Current
  • Internal Soft-Start
  • Open/Shorted LED Protection
  • PWM Brightness Control
  • LED Current Matching Typically <2.5%
  • Constant Frequency 1MHz Operation
  • Low Shutdown Current: 6.5µA
  • Overtemperature Protection
  • Small Thermally Enhanced 20-Lead (4mm × 4mm) QFN Package
Additional Details
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The LTC3452 is a synchronous buck-boost DC/DC converter optimized for driving two banks of white LEDs from a single Li-Ion battery input. Five parallel LEDs can be driven at up to 25mA each in the low power LED bank, while two LEDs can be driven at up to 150mA each (or a single LED at 300mA) in the high power LED bank. The regulator operates in either synchronous buck, synchronous boost or buck-boost mode, depending on input voltage and LED maximum forward voltage. Optimum efficiency is achieved by sensing which LED requires the largest forward voltage drop at its programmed current, and regulating the common output rail for lowest dropout. Efficiency of 85% can be achieved over the entire usable range of a Li-Ion battery (2.7V to 4.2V).

Maximum LED current for each LED display is programmable with a single external resistor. Dual enable pins allow for PWM brightness control in the low power bank and independent on/off control for the high current bank (optimal for LED camera flash). In shutdown, the supply current is only 6.5µA.

A high constant operating frequency of 1MHz allows the use of a small external inductor. The LTC3452 is offered in a low profile (0.75mm) thermally enhanced 20-lead (4mm × 4mm) QFN package.

Applications

  • Cell Phones
  • Digital Cameras
  • PDAs
  • Portable Devices
Part Models 2
1ku List Price Starting From $2.19

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3452EUF#PBF
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LTC3452EUF#TRPBF
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Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

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Part Models

Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

Software & Part Ecosystem

Software & Part Ecosystem

Tools & Simulations

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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