LTC3549EDCB#TRPBF

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Analog Devices Inc./Maxim Integrated

CONV DC-DC 1.6V TO 5.5V SYNCHRONOUS STEP DOWN SINGLE-OUT 0.611V TO 5.5V 0.25A 6-PIN DFN EP T/R

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LTC3549EDCB#TRPBF

Active

Analog Devices Inc./Maxim Integrated

CONV DC-DC 1.6V TO 5.5V SYNCHRONOUS STEP DOWN SINGLE-OUT 0.611V TO 5.5V 0.25A 6-PIN DFN EP T/R

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3549 Series

The LTC3549 is a high efficiency, monolithic synchronous buck regulator using a constant-frequency, current mode architecture. The output voltage is adjusted via an external resistor divider.A fixed switching frequency of 2.25MHz is supported. This switching frequency allows the use of small surface mount inductors and capacitors, including ceramics.Supply current during Burst Mode operation is only 50µA dropping to < 1µA in shutdown. The 1.6V to 5.5V input voltage range makes the LTC3549 ideally suited for single cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd or NiMH battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. Burst Mode operation can be user-enabled, increasing efficiency at light loads, further extending battery life.The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Internal soft-start offers controlled output voltage rise time at startup without the need for external components.Applications2 AA-Cell ApplicationsCellular PhonesDigital CamerasMP3 Players

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3549EDCB#TRPBF

Current - Output	250 mA
Frequency - Switching	2.25 MHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	85 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	6-WFDFN Exposed Pad
Package Length	2 mm
Package Name	6-DFN
Package Width	3 mm
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Input (Max)	5.5 V
Voltage - Input (Min)	1.6 V
Voltage - Output (Max)	5.5 V
Voltage - Output (Min/Fixed)	0.611 V

LTC3549 Series

Part	Voltage - Output (Min/Fixed)	Function	Current - Output	Package / Case	Operating Temperature (Max)	Operating Temperature (Min)	Output Type	Package Width	Package Name	Package Length	Number of Outputs	Mounting Type	Output Configuration	Voltage - Input (Min)	Voltage - Input (Max)	Voltage - Output (Max)	Frequency - Switching	Synchronous Rectifier	Topology
Analog Devices Inc./Maxim Integrated LTC3549EDCB#TRPBF	0.611 V	Step-Down	250 mA	6-WFDFN Exposed Pad	85 °C	-40 °C	Adjustable	3 mm	6-DFN	2 mm	1	Surface Mount	Positive	1.6 V	5.5 V	5.5 V	2.25 MHz	Yes	Buck
Analog Devices Inc./Maxim Integrated LTC3549EDCB#TRMPBF	0.611 V	Step-Down	250 mA	6-WFDFN Exposed Pad	85 °C	-40 °C	Adjustable	3 mm	6-DFN	2 mm	1	Surface Mount	Positive	1.6 V	5.5 V	5.5 V	2.25 MHz	Yes	Buck

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

R415 Reliability Data

LTC3549EDCB#TRPBF | Datasheet