LT1949

PRODUCTION

600kHz, 1A Switch PWM DC/DC Converter

Data Sheet Product Selection Table
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Overview

  • 1.1A, 0.5Ω, 30V Internal Switch
  • Operates with VIN as Low as 1.5V
  • 600kHz Fixed Frequency Operation
  • Low-Battery Detector Active in Shutdown
  • Low VCESAT Switch: 410mV at 800mA
  • Pin-for-Pin Compatible with the LT1317B
  • Small 8-Lead MSOP Package and SO Packages

The LT1949 is a fixed frequency step-up DC/DC converter with a 1A, 0.5Ω internal switch. Capable of generating 10V at 175mA from a 3.3V input, the LT1949 is ideal for generating bias voltages for large screen LCD panels. Constant frequency 600kHz operation results in a low noise output that is easy to filter and the 30V switch rating allows output voltage up to 28V using a single inductor. An external compensation pin gives the user flexibility in optimizing loop compensation, allowing small low ESR ceramic capacitors to be used at the output. The 8-lead MSOP and SO packages ensure a low profile overall solution.

The LT1949 includes a low-battery detector that stays alive when the device goes into shutdown. Quiescent current in shutdown is 25µA, while operating current is 4.5mA.

Applications

  • LCD Bias Supplies
  • GPS Receivers
  • Battery Backup
  • Portable Electronic Equipment
  • Diagnostic Medical Instrumentation
LT1949
600kHz, 1A Switch PWM DC/DC Converter
Figure 1. 3.3V to 10V/175mA DC/DC Converter Figure 2. 3.3V to 10V Converter Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

Data Sheet

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT1949
  • LT1949-1
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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.

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