Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck
Power Management PMIC & Multifunction Multi-Topology DC/DC
 Power Management Switching Regulator Step-Down (Buck) Regulators Buck Regulator Plus LDO

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LTC3541 - High Efficiency Buck + VLDO Regulator

Features

  • High Efficiency, 500mA Buck Plus 300mA VLDO Regulator
  • Auto Start-Up Powers Buck Output Prior to VLDO/Linear Regulator Output
  • Independent High Efficiency, 500mA Buck (VIN: 2.7V to 5.5V)
  • 300mA VLDO Regulator with 30mA Standalone Mode
  • No External Schottky Diodes Required
  • Buck Output Voltage Range: 0.8V to 5V
  • VLDO Input Voltage Range (LVIN): 0.9V to 5.5V
  • VLDO Output Voltage Range VLDO: 0.4V to 4.1V
  • Selectable Fixed Frequency, Pulse-Skip Operation or Burst Mode® Operation
  • Short-Circuit Protected
  • Current Mode Operation for Excellent Line and Load
  • Transient Response
  • Constant Frequency Operation: 2.25MHz
  • Low Dropout Buck Operation: 100% Duty Cycle
  • Small, Thermally Enhanced, 10-Lead (3mm × 3mm) DFN Package

Typical Application

LTC3541 Typical Application
LTC3541 Typical Application

Description

The LTC3541 combines a synchronous buck DC/DC converter with a very low dropout linear regulator (VLDO) to provide up to two output voltages from a single input voltage with minimal external components. When configured for dual output operation, the LTC3541’s auto start-up feature will bring the Buck output into regulation in a controlled manner prior to enabling the VLDO regulator output without the need for external pin control. VLDO/ linear regulator output prior to Buck output sequencing may also be obtained via external pin control. The input voltage range is ideally suited for Li-Ion battery-powered applications, as well as powering sub-3.3V logic from 5V or 3.3V rails.

The synchronous buck converter provides a high efficiency output, typically 90%, capable of providing up to 500mA of continuous output current while switching at 2.25MHz, allowing the use of small surface mount inductors and capacitors. A mode-select pin allows Burst Mode operation to be enabled for higher effi ciency at light load currents, or disabled for lower noise, constant frequency operation.

The VLDO regulator provides a low noise, low voltage output capable of providing up to 300mA of continuous output current using only a 2.2μF ceramic capacitor. The input supply voltage of the VLDO regulator (LVIN) may come from the buck regulator or a separate supply.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

DFN-10

LTC3541 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3541EDD#PBF DFN 10 E $2.70 $1.89 View
LTC3541EDD#TRPBF DFN 10 E $1.95 View
LTC3541EDD-1#PBF DFN 10 E $2.70 $1.89 View
LTC3541EDD-1#TRPBF DFN 10 E $1.95 View
LTC3541EDD-2#PBF DFN 10 E $2.70 $1.89 View
LTC3541EDD-2#TRPBF DFN 10 E $1.95 View
LTC3541EDD-3#PBF DFN 10 E $2.70 $1.89 View
LTC3541EDD-3#TRPBF DFN 10 E $1.95 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.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC970A-A LTC3541| High efficiency Buck Plus VLDO Regulator Contact Factory
DC970A-B LTC3541EDD Demo Board | High efficiency Buck Plus VLDO Regulator Contact Factory
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Click here to view our complete list of demo boards

Applications

  • PDAs/Palmtop PCs
  • Digital Cameras
  • Cellular Phones
  • PC Cards
  • Wireless and DSL Modems
  • Other Portable Power Systems

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Related models available in LTspice IV
LTC3541-1
LTC3541-2
LTC3541-3
LTC3541

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