LTC3542

PRODUCTION

500mA, 2.25MHz Synchronous Step-Down DC/DC Converter

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Overview

  • High Efficiency: Up to 96%
  • High Peak Switch Current: 1000mA
  • Low Output Ripple (<20mVP-P Typical) Burst Mode Operation: Only 26µA
  • Very Low Quiescent Current: Only 26µA
  • 2.5V to 5.5V Input Voltage Range
  • 2.25MHz Constant Frequency Operation
  • 1MHz to 3MHz External Frequency Synchronization
  • Low Dropout Operation: 100% Duty Cycle
  • No Schottky Diode Required
  • Internal Soft-Start Limits Inrush Current
  • 0.6V Reference Allows Low Output Voltages
  • Shutdown Mode Draws <1µA Supply Current
  • ±2% Output Voltage Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Overtemperature Protected
  • Available in 6-Lead 2mm × 2mm DFN and Small TSOT

The LTC3542 is a high efficiency monolithic synchronous buck converter using a constant frequency, current mode architecture. Supply current during operation is only 26µA, dropping to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3542 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. The output voltage is adjustable from 0.6V to VIN. Internal power switches are optimized to provide high efficiency and eliminate the need for an external Schottky diode.

Switching frequency is internally set at 2.25MHz, allowing the use of small surface mount inductors and capacitors, and it can synchronize to an external clock signal with a frequency range of 1MHz to 3MHz through the MODE/ SYNC pin. The LTC3542 is specifically designed to work well with ceramic output capacitors, achieving very low output voltage ripple and a small PCB footprint.

The LTC3542 can be configured for the power saving Burst Mode® Operation. For reduced noise and RF interference, the MODE/SYNC pin can be configured for pulse skipping operation.

Applications

  • Cellular Telephones
  • Wireless and DSL Modems
  • Digital Cameras
  • MP3 Players
  • PDAs and Other Handheld Devices
LTC3542
500mA, 2.25MHz Synchronous Step-Down DC/DC Converter
Effi ciency and Power Loss vs Output Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Oscillators 1
LTC6908
Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LTC2955
RECOMMENDED FOR NEW DESIGNS Pushbutton On/Off Controller with Automatic Turn-On
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3542
  • LTC3542-1
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
schematic 1
DC993A

LTC3542EDC Demo Board | 2.5 ≤ VIN ≤ 5.5V, VOUT = 1.2V/1.5V/1.8V @ 500mA

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Product Details

Demonstration circuit 993A is a step-down converter, using the LTC3542 monolithic synchronous buck regulator. The DC993A has an input voltage range of 2.5V to 5.5V, and is capable of delivering up to 500 mA of output current in a small 2x2 mm DFN package. The output voltage of the DC993A can be set as low as 0.6V, the reference voltage of the LTC3542.
DC993A
LTC3542EDC Demo Board | 2.5 ≤ VIN ≤ 5.5V, VOUT = 1.2V/1.5V/1.8V @ 500mA
DC993A - Schematic

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