LTC3547EDDB-1#TRMPBF

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Analog Devices Inc./Maxim Integrated

DUAL MONOLITHIC 300MA SYNCHRONOUS STEP-DOWN REGULATOR

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LTC3547EDDB-1#TRMPBF

Active

Analog Devices Inc./Maxim Integrated

DUAL MONOLITHIC 300MA SYNCHRONOUS STEP-DOWN REGULATOR

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3547 Series

The LTC3547 is a dual, 2.25MHz, constant-frequency, synchronous step-down DC/DC converter in a tiny 3mm × 2mm DFN package. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Low output voltages are supported with the 0.6V feedback reference voltage. Each regulator can supply 300mA continuous output current.The input voltage range is 2.5V to 5.5V, making it ideal for Li-Ion and USB powered applications. Supply current during operation is only 40µA and drops to < 1µA in shutdown. Automatic Burst Mode®operation increases efficiency at light loads, further extending battery life.An internally set 2.25MHz switching frequency allows the use of tiny surface mount inductors and capacitors. Internal soft-start reduces inrush current during startup. All outputs are internally compensated to work with ceramic capacitors. The LTC3547 is available in a low profile (0.75mm) 3mm × 2mm DFN package.The LTC3547is also available in a fixed output voltage configuration,eliminating the need for the external feedback networksApplicationsCellular TelephonesDigital Still CamerasWireless and DSL ModemsPDAs/Palmtop PCsPortable Media Players

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3547EDDB-1#TRMPBF

Current - Output	300 mA
Frequency - Switching	2.25 MHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	2
Operating Temperature (Max)	85 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Type	Fixed
Package / Case	8-WFDFN Exposed Pad
Package Length	3 mm
Package Name	8-DFN
Package Width	2 mm
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Input (Max)	5.5 V
Voltage - Input (Min)	2.5 V
Voltage - Output (Fixed)	1.8 V
Voltage - Output (Min)	1.2 V

LTC3547 Series

Dual Monolithic 300mA Synchronous Step-Down Regulator

Part	Frequency - Switching	Package Width	Package Name	Package Length	Voltage - Input (Max)	Output Configuration	Number of Outputs	Package / Case	Mounting Type	Voltage - Input (Min)	Topology	Output Type	Voltage - Output (Min)	Voltage - Output (Fixed)	Function	Synchronous Rectifier	Current - Output	Operating Temperature (Max)	Operating Temperature (Min)	Voltage - Output (Min/Fixed)	Voltage - Output (Max)
Analog Devices Inc./Maxim Integrated LTC3547EDDB-1#TRPBF	2.25 MHz	2 mm	8-DFN	3 mm	5.5 V	Positive	2	8-WFDFN Exposed Pad	Surface Mount	2.5 V	Buck	Fixed	1.2 V	1.8 V	Step-Down	Yes	300 mA	85 °C	-40 °C
Analog Devices Inc./Maxim Integrated LTC3547BEDDB-1#TRMPBF	2.25 MHz	2 mm	8-DFN	3 mm	5.5 V	Positive	2	8-WFDFN Exposed Pad	Surface Mount	2.5 V	Buck	Fixed	1.2 V	1.8 V	Step-Down	Yes	300 mA	85 °C	-40 °C
Analog Devices Inc./Maxim Integrated LTC3547EDDB#TRMPBF	2.25 MHz	2 mm	8-DFN	3 mm	5.5 V	Positive	2	8-WFDFN Exposed Pad	Surface Mount	2.5 V	Buck	Adjustable			Step-Down	Yes	300 mA	85 °C	-40 °C	0.6 V	5.5 V
Analog Devices Inc./Maxim Integrated LTC3547EDDB#TRPBF	2.25 MHz	2 mm	8-DFN	3 mm	5.5 V	Positive	2	8-WFDFN Exposed Pad	Surface Mount	2.5 V	Buck	Adjustable			Step-Down	Yes	300 mA	85 °C	-40 °C	0.6 V	5.5 V
Analog Devices Inc./Maxim Integrated LTC3547BEDDB#TRMPBF	2.25 MHz	2 mm	8-DFN	3 mm	5.5 V	Positive	2	8-WFDFN Exposed Pad	Surface Mount	2.5 V	Buck	Adjustable			Step-Down	Yes	300 mA	85 °C	-40 °C	0.6 V	5.5 V
Analog Devices Inc./Maxim Integrated LTC3547EDDB-1#TRMPBF	2.25 MHz	2 mm	8-DFN	3 mm	5.5 V	Positive	2	8-WFDFN Exposed Pad	Surface Mount	2.5 V	Buck	Fixed	1.2 V	1.8 V	Step-Down	Yes	300 mA	85 °C	-40 °C
Analog Devices Inc./Maxim Integrated LTC3547BEDDB-1#TRPBF	2.25 MHz	2 mm	8-DFN	3 mm	5.5 V	Positive	2	8-WFDFN Exposed Pad	Surface Mount	2.5 V	Buck	Fixed	1.2 V	1.8 V	Step-Down	Yes	300 mA	85 °C	-40 °C

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LTC3547EDDB-1#TRMPBF | Datasheet

Tape and Reel Packaging

LTpowerPlanner III Quick Start Guide

R415 Reliability Data