LT1946A

PRODUCTION

2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start

Data Sheet Product Selection Table
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Overview

  • 1.5A, 36V Internal Switch
  • 2.7MHz Switching Frequency
  • Integrated Soft-Start Function
  • Adjustable Output from VIN to 35V
  • Low VCESAT Switch: 300mV at 1.5A (Typical)
  • 12V at 430mA from a 5V Input
  • Small Thermally Enhanced 8-Lead MSOP Package

The LT1946A is a fixed frequency step-up DC/DC converter containing an internal 1.5A, 36V switch. Capable of generating 12V at 430mA from a 5V input, the LT1946A is ideal for powering large TFT-LCD panels. The LT1946A switches at 2.7MHz, allowing the use of tiny, low profile inductors and low value ceramic capacitors. Loop compensation can be either internal or external, giving the user flexibility in setting loop compensation and allowing optimized transient response with low ESR ceramic output capacitors. Soft-start is controlled with an external capacitor which determines the input current ramp rate during start up. The 8-lead MSOP package and high switching frequency ensure a low profile overall solution less than 1.1mm high.

Switching Frequency
LT1946 1.2MHz
LT1946A 2.7MHz

Applications

  • TFT-LCD Bias Supplies
  • GPS Receivers
  • DSL Modems
  • Local Power Supply
LT1946A
2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
Figure 1. 5V to 12V, 430mA Step-Up DC/DC Converter Efficiency Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT1946
  • LT1946A
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Evaluation Kits

eval board
schematic 1
DC459A

LT1946EMS8 LT1946AEMS8E | 12VOUT Boost Converter, +5VIN, +12VOUT/400mA and Triple Output TFT LCD Bias Supply, 3.3VIN, VOUT = +23V/5mA, +8V/350mA, -8V/10mA

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Product Details

DC459A Demo Board for:
LT1946 1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
LT1946A 2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start


 
DC459A
LT1946EMS8 LT1946AEMS8E | 12VOUT Boost Converter, +5VIN, +12VOUT/400mA and Triple Output TFT LCD Bias Supply, 3.3VIN, VOUT = +23V/5mA, +8V/350mA, -8V/10mA
DC459A - Schematic

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