LTC3251 Series

500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters

Part	Supplier Device Package	Number of Outputs	Function	Output Type	Voltage - Input (Max) [Max]	Mounting Type	Frequency - Switching [Max]	Frequency - Switching [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output (Min/Fixed)	Voltage - Input (Min) [Min]	Output Configuration	Voltage - Output (Max) [Max]	Package / Case	Current - Output
Analog Devices Inc./Maxim Integrated LTC3251EMSE#PBF	10-MSOP-EP	1	Step-Down	Adjustable	5.5 V	Surface Mount	1.6 MHz	1 MHz	85 C	-40 ¯C	0.9 V	2.7 V	Positive	1.6 V	10-MSOP 10-TFSOP Exposed Pad	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE-1.2#PBF	10-MSOP-EP	1	Step-Down		5.5 V	Surface Mount	1.6 MHz	1 MHz	85 C	-40 ¯C	1.2 V	2.7 V	Positive		10-MSOP 10-TFSOP Exposed Pad	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE-1.5#PBF	10-MSOP-EP	1	Step-Down		5.5 V	Surface Mount	1.6 MHz	1 MHz	85 C	-40 ¯C	1.5 V	2.7 V	Positive		10-MSOP 10-TFSOP Exposed Pad	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE-1.2#TRPBF	10-MSOP-EP	1	Step-Down		5.5 V	Surface Mount	1.6 MHz	1 MHz	85 C	-40 ¯C	1.2 V	2.7 V	Positive		10-MSOP 10-TFSOP Exposed Pad	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE-1.5#TRPBF	10-MSOP-EP	1	Step-Down		5.5 V	Surface Mount	1.6 MHz	1 MHz	85 C	-40 ¯C	1.5 V	2.7 V	Positive		10-MSOP 10-TFSOP Exposed Pad	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE#TRPBF	10-MSOP-EP	1	Step-Down	Adjustable	5.5 V	Surface Mount	1.6 MHz	1 MHz	85 C	-40 ¯C	0.9 V	2.7 V	Positive	1.6 V	10-MSOP 10-TFSOP Exposed Pad	500 mA

Catalog

500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters

Description

The LTC3251/LTC3251-1.2/LTC3251-1.5 are 2-phase charge pump step-down DC/DC converters that produce a regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve twice the typical efficiency of a linear regulator. No inductors are required. VOUTis resistor programmable from 0.9V to 1.6V or fixed at 1.2V or 1.5V, with up to 500mA of load current available.A unique 2-phase spread spectrum architecture provides a very low noise regulated output as well as low noise at the input. The parts have four operating modes: Continuous Spread Spectrum, Spread Spectrum with Burst Mode operation, Super Burst™mode operation and shutdown.Low operating current (35µA in Burst Mode operation, 10µA in Super Burst mode operation) and low external parts count make the LTC3251/LTC3251-1.2/LTC3251-1.5 ideally suited for space-constrained battery-powered applications. The parts are short-circuit and over-temperature protected, and are available in a thermally enhanced 10-pin MSOP package.ApplicationsHandheld DevicesCellular PhonesPortable Electronic EquipmentDSP Power Supplies