LTC3548-2

PRODUCTION

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

Part Models: 2
1ku List Price: Starting From $2.85

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Part Details

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 R_DS(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: I_Q < 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 V_IN. 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

Part Models: 2
1ku List Price: Starting From $2.85

Documentation

Data Sheet 1

LTC3548-2: Dual Synchronous, Fixed/Adjustable Output, 2.25MHz Step-Down DC/DC Regulator Data Sheet 07/31/2009

Reliability Data 1

R415 Reliability Data 03/23/2018

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3548EDD-2#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3548EDD-2#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
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
LTC4365	RECOMMENDED FOR NEW DESIGNS	Overvoltage, Undervoltage and Reverse Supply Protection Controller
Supervisory Circuits & Reset ICs 1
LTC2935	PRODUCTION	Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
Switching Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice 1

LTC3548-2 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC3548
LTC3548-1
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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