LTC3548 Series

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

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

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

Part	Output Type	Function	Number of Outputs	Voltage - Input (Max) [Max]	Output Configuration	Voltage - Input (Min) [Min]	Package / Case	Topology	Current - Output	Frequency - Switching	Voltage - Output (Max) [Max]	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Voltage - Output (Min/Fixed)	Voltage - Output (Min/Fixed) [Min]
Analog Devices Inc./Maxim Integrated LTC3548AIMSE#PBF	Adjustable	Step-Down Step-Up/Step-Down	2	5.5 V	Positive	2.5 V	10-MSOP 10-TFSOP Exposed Pad	Buck Buck-Boost	400 mA 800 mA	2.25 MHz	5 V	Surface Mount	-40 C	125 °C	10-MSOP-EP	0.6 V
Analog Devices Inc./Maxim Integrated LTC3548IDD#TRPBF	Adjustable	Step-Down Step-Up/Step-Down	2	5.5 V	Positive	2.5 V	10-WFDFN Exposed Pad	Buck Buck-Boost	400 mA 800 mA	2.25 MHz	5 V	Surface Mount	-40 ¯C	85 C	10-DFN (3x3)	0.6 V
Analog Devices Inc./Maxim Integrated LTC3548IMSE#TRPBF	Adjustable	Step-Down Step-Up/Step-Down	2	5.5 V	Positive	2.5 V	10-MSOP 10-TFSOP Exposed Pad	Buck Buck-Boost	400 mA 800 mA	2.25 MHz	5 V	Surface Mount	-40 ¯C	85 C	10-MSOP-EP	0.6 V
Analog Devices Inc./Maxim Integrated LTC3548EDD-2#TRPBF	Adjustable (Fixed)	Step-Down Step-Up/Step-Down	2	5.5 V	Positive	2.5 V	10-WFDFN Exposed Pad	Buck Buck-Boost	1.2 A 700 mA	2.25 MHz	5.5 V	Surface Mount	-40 ¯C	85 C	10-DFN (3x3)	1.8 V	0.6 V
Analog Devices Inc./Maxim Integrated LTC3548EDD#PBF	Adjustable	Step-Down Step-Up/Step-Down	2	5.5 V	Positive	2.5 V	10-WFDFN Exposed Pad	Buck Buck-Boost	400 mA 800 mA	2.25 MHz	5 V	Surface Mount	-40 ¯C	85 C	10-DFN (3x3)	0.6 V
Analog Devices Inc./Maxim Integrated LTC3548AIDD#TRPBF	Adjustable	Step-Down Step-Up/Step-Down	2	5.5 V	Positive	2.5 V	10-WFDFN Exposed Pad	Buck Buck-Boost	400 mA 800 mA	2.25 MHz	5 V	Surface Mount	-40 C	125 °C	10-DFN (3x3)	0.6 V
Analog Devices Inc./Maxim Integrated LTC3548EMSE#TRPBF	Adjustable	Step-Down Step-Up/Step-Down	2	5.5 V	Positive	2.5 V	10-MSOP 10-TFSOP Exposed Pad	Buck Buck-Boost	400 mA 800 mA	2.25 MHz	5 V	Surface Mount	-40 ¯C	85 C	10-MSOP-EP	0.6 V
Analog Devices Inc./Maxim Integrated LTC3548AEDD#TRPBF	Adjustable	Step-Down Step-Up/Step-Down	2	5.5 V	Positive	2.5 V	10-WFDFN Exposed Pad	Buck Buck-Boost	400 mA 800 mA	2.25 MHz	5 V	Surface Mount	-40 C	125 °C	10-DFN (3x3)	0.6 V
Analog Devices Inc./Maxim Integrated LTC3548EDD-1#PBF		Step-Down	2	5.5 V	Positive	2.5 V	10-WFDFN Exposed Pad	Buck	1.2 A 700 mA	2.25 MHz		Surface Mount	-40 ¯C	85 C	10-DFN (3x3)	1.575 V 1.8 V
Analog Devices Inc./Maxim Integrated LTC3548EKD-1		Step-Down	2	5.5 V	Positive	2.5 V	10-UFDFN Exposed Pad	Buck	1.2 A 700 mA	2.25 MHz		Surface Mount	-40 ¯C	85 C	10-UTDFN (3x3)	1.575 V 1.8 V

Catalog

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

Description

The LTC3548 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.FeaturesLTC3548AImproved Burst Mode, Improved ESD, 2 Adjustable OutputsLTC3548-2One Fixed 1.8V Output, 1 AdjustableLTC3548-1Fixed 1.8V and 1.575V OutputsLTC35482 Adjustable OutputsApplicationsPDAs/Palmtop PCsDigital CamerasCellular PhonesPortable Media PlayersPC CardsWireless and DSL Modems