LTC3548-1

Obsolete

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

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Part Details

High Efficiency: Up to 95%
1.8V at 800mA/1.575V at 400mA
Very Low Quiescent Current: Only 40µA
2.25MHz Constant-Frequency Operation
High Switch Current: 1.2A and 0.7A
No Schottky Diodes Required
V_IN: 2.5V to 5.5V
Current Mode Operation for Excellent Line and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I_Q < 1µA
Small Thermally Enhanced 3mm × 3mm DFN Packages

The LTC3548-1 is a dual, fixed output, 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 ≤1mm. The output voltage for channel 1 is fixed at 1.8V and for channel 2 is fixed at 1.575V. Internal synchronous 0.35Ω, 1.2A/0.7A power switches provide high efficiency without the need for external Schottky diodes. Burst Mode^® operation provides high efficiency at light loads.

To further maximize battery runtime, 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.

The LTC3548-1 is available in both thin (0.75mm) and ultra-thin (0.55mm) 3mm × 3mm DFN packages.


	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

Documentation

Data Sheet 1

LTC3548-1: Dual Synchronous, Fixed Output 2.25MHz Step-Down DC/DC Regulator Data Sheet 07/31/2009

Reliability Data 1

R415 Reliability Data 03/23/2018

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

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
Single-Supply Monitors 1
LTC2935	PRODUCTION	Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LTC4365	RECOMMENDED FOR NEW DESIGNS	Overvoltage, Undervoltage and Reverse Supply Protection Controller

Tools & Simulations

LTspice 1

LTC3548-1 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC3548
LTC3548-1
LTC3548-2
LTC3548A

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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