LT1949 - 600kHz, 1A Switch PWM DC/DC Converter

Features

  • 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

Typical Application

LT1949
LT1949
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Description

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.

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Packaging

SO-8, MS-8

LT1949
LT1949
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1949EMS8 MSOP 8 E $2.66 $2.25 View
LT1949EMS8#PBF MSOP 8 E $2.66 $2.25 View
LT1949EMS8#TR MSOP 8 E   $2.31 View
LT1949EMS8#TRPBF MSOP 8 E   $2.31 View
LT1949ES8 SO 8 E $2.60 $2.20 View
LT1949ES8#PBF SO 8 E $2.60 $2.20 View
LT1949ES8#TR SO 8 E   $2.26 View
LT1949ES8#TRPBF SO 8 E   $2.26 View
LT1949IS8 SO 8 I $2.95 $2.50 View
LT1949IS8#PBF SO 8 I $2.95 $2.50 View
LT1949IS8#TR SO 8 I   $2.56 View
LT1949IS8#TRPBF SO 8 I   $2.56 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

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Applications

  • LCD Bias Supplies
  • GPS Receivers
  • Battery Backup
  • Portable Electronic Equipment
  • Diagnostic Medical Instrumentation
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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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