Power Management Switching Regulator Step-Down (Buck) Regulators Multiple Output Buck
Power Management Switching Regulator Step-Down (Buck) Regulators Micropower Buck
 Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck

For New Designs

LTC3548A - Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3548 - Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

Features

  • High Efficiency: Up to 95%
  • Very Low Quiescent Current: Only 40μA
  • Low Output Ripple Burst Mode® Operation
  • 2.25MHz Constant Frequency Operation
  • High Switch Current: 0.7A and 1.2A
  • 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
  • Output Voltages from 5V down to 0.6V
  • Power-On Reset Output
  • Externally Synchronizable Oscillator
  • Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages

Typical Application

LTC3548 Typical Application
LTC3548 Typical Application

Description

The LTC®3548 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 ≤1mm. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 0.7A/1.2A 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-Skipping Mode provides low noise ripple 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

DFN-10, MS-10

LTC3548 Package Drawing
LTC3548 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3548AEDD#PBF DFN 10 E $3.71 $2.60 View
LTC3548AEDD#TRPBF DFN 10 E $2.66 View
LTC3548AEMSE#PBF MSOP 10 E $3.71 $2.60 View
LTC3548AEMSE#TRPBF MSOP 10 E $2.66 View
LTC3548AIDD#PBF DFN 10 I $4.27 $2.99 View
LTC3548AIDD#TRPBF DFN 10 I $3.05 View
LTC3548AIMSE#PBF MSOP 10 I $4.27 $2.99 View
LTC3548AIMSE#TRPBF MSOP 10 I $3.05 View
LTC3548EDD DFN 10 E $3.71 $2.60 View
LTC3548EDD#PBF DFN 10 E $3.71 $2.60 View
LTC3548EDD#TR DFN 10 E $2.66 View
LTC3548EDD#TRPBF DFN 10 E $2.66 View
LTC3548EDD-1 DFN 10 E $3.71 $2.60 View
LTC3548EDD-1#PBF DFN 10 E $3.71 $2.60 View
LTC3548EDD-1#TR DFN 10 E $2.66 View
LTC3548EDD-1#TRPBF DFN 10 E $2.66 View
LTC3548EDD-2 DFN 10 E $3.71 $2.60 View
LTC3548EDD-2#PBF DFN 10 E $3.71 $2.60 View
LTC3548EDD-2#TR DFN 10 E $2.66 View
LTC3548EDD-2#TRPBF DFN 10 E $2.66 View
LTC3548EKD-1#PBF UTDFN 10 E $4.18 $2.71 View
LTC3548EKD-1#TRPBF UTDFN 10 E $2.66 View
LTC3548EMSE MSOP 10 E $3.71 $2.60 View
LTC3548EMSE#PBF MSOP 10 E $3.71 $2.60 View
LTC3548EMSE#TR MSOP 10 E $2.66 View
LTC3548EMSE#TRPBF MSOP 10 E $2.66 View
LTC3548IDD DFN 10 I $4.27 $2.99 View
LTC3548IDD#PBF DFN 10 I $4.27 $2.99 View
LTC3548IDD#TR DFN 10 I $3.05 View
LTC3548IDD#TRPBF DFN 10 I $3.05 View
LTC3548IMSE MSOP 10 I $4.27 $2.99 View
LTC3548IMSE#PBF MSOP 10 I $4.27 $2.99 View
LTC3548IMSE#TR MSOP 10 I $3.05 View
LTC3548IMSE#TRPBF MSOP 10 I $3.05 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC822A LTC3548EDD | Dual Synchronous Step-Down DC/DC Converter, 2.5V to 5.5Vin, 1.2/1.5/1.8Vout1@800mA, 2.5Vout2@400mA Contact Factory
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Click here to view our complete list of demo boards

Applications

  • PDAs/Palmtop PCs
  • Digital Cameras
  • Cellular Phones
  • Portable Media Players
  • PC Cards
  • Wireless and DSL Modems

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Related models available in LTspice IV
LTC3548-1
LTC3548
LTC3548A

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