LTC3548-2

PRODUCTION

Dual Synchronous, Fixed/Adjustable Output, 2.25MHz Step-Down DC/DC Regulator

Data Sheet Product Selection Table
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Overview

  • High Efficiency: Up to 95%
  • 1.8V/800mA Fixed Output and 400mA Adjustable Output Voltage
  • Only 40μA Quiescent Current (Both Channels)
  • 2.25MHz Constant Frequency Operation
  • High Switch Current Limits: 1.2A and 0.7A
  • No Schottky Diodes Required
  • Low RDS(ON) Internal Switches: 0.35Ω
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Short-Circuit Protected
  • Low Dropout Operation: 100% Duty Cycle
  • Ultralow Shutdown Current: IQ < 1μA
  • Power-On Reset Output
  • Externally Synchronizable Oscillator
  • Small Thermally Enhanced 3mm × 3mm DFN Package

The LTC3548-2 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1.2mm. For channel 1, the output voltage is fixed at 1.8V/800mA; for channel 2, the output voltage is adjustable from 0.6V to VIN. Internal synchronous 0.35Ω, 1.2A/0.7A power switches provide high efficiency without the need for external Schottky diodes.

A user selectable mode input is provided to allow the user to trade-off noise ripple for low power efficiency. Burst Mode® operation provides high efficiency at light loads, while Pulse-Skip Mode provides low noise ripple at light loads.

To further maximize battery run time, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40μA. In shutdown, the device draws <1μA.

Features
LTC3548A Improved Burst Mode, Improved ESD, 2 Adjustable Outputs
LTC3548-2 One Fixed 1.8V Output, 1 Adjustable
LTC3548-1 Fixed 1.8V and 1.575V Outputs
 LTC3548 2 Adjustable Outputs 

Applications

  • PDAs/Palmtop PCs
  • Digital Cameras
  • Cellular Phones
  • Portable Media Players
  • PC Cards
  • Wireless and DSL Modems
LTC3548-2
Dual Synchronous, Fixed/Adjustable Output, 2.25MHz Step-Down DC/DC Regulator
Figure 1. 2.5V/1.8V at 400mA/800mA Step-Down Regulators Efficiency and Power Loss vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Data Sheet

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Software Resources

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Hardware Ecosystem

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3548
  • LTC3548-1
  • LTC3548-2
  • LTC3548A
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.

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