LTC3541-1

PRODUCTION

High Efficiency Buck + VLDO Regulator

Part Models
2
1ku List Price
Starting From $2.30
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Part Details

  • High Efficiency, 500mA Buck Plus 300mA VLDO Regulator
    • Auto Start-Up Powers VLDO/Linear Regulator Output Prior to Buck 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
LTC3541-1
High Efficiency Buck + VLDO Regulator
LTC3541-1 Typical Application Buck (Burst) Efficiency and Power Loss vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital Power System Managers 1
LTC2974 RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Multiple Output Buck Regulators 1
LTC3880 RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice


Models for the following parts are available in LTspice:

  • LTC3541
  • LTC3541-1
  • LTC3541-2
  • LTC3541-3
LTspice

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.


Evaluation Kits

eval board
DC970A-B

LTC3541-1 Demo Board | 3V ≤ VIN ≤ 5.5V, VOUT1 (Buck) = 1.8V or 2.5V @ 500mA, VOUT2 (VLDO) = 0.8V/1.2V/1.5V/1.8V @ 300mA

Product Details

Demonstration circuit DC970A-A and DC970A-B feature the LTC3541 and LTC3541-1 respectfully, and provide a high efficiency, synchronous buck plus VLDO linear regulator. For the LTC3541, the buck regulator powers up before the linear regular, and for the LTC3541-1, the linear regulator powers up first.


The DC970A has an input voltage range of 3.0V to 5.5V. The jumper selectable (2.5V or 1.8V) buck regulator output is capable of delivering up to 500mA of output current; the jumper selectable (0.8V, 1.2V, 1.5V or 1.8V) linear regulator output is capable of delivering up to 300mA of current.

DC970A-B
LTC3541-1 Demo Board | 3V ≤ VIN ≤ 5.5V, VOUT1 (Buck) = 1.8V or 2.5V @ 500mA, VOUT2 (VLDO) = 0.8V/1.2V/1.5V/1.8V @ 300mA
DC970A-A - Schematic

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