LTC3251EMSE-1.5#PBF

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Analog Devices Inc./Maxim Integrated

500MA HIGH EFFICIENCY, LOW NOISE, INDUCTORLESS STEP-DOWN DC/DC CONVERTERS

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LTC3251EMSE-1.5#PBF

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Analog Devices Inc./Maxim Integrated

500MA HIGH EFFICIENCY, LOW NOISE, INDUCTORLESS STEP-DOWN DC/DC CONVERTERS

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3251 Series

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

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3251EMSE-1.5#PBF

Current - Output	500 mA
Frequency - Switching (Max)	1.6 MHz
Frequency - Switching (Min)	1 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	Fixed
Package Features	Exposed Pad
Package Length	0.118 in
Package Name	10-MSOP, 10-MSOP-EP
Package Width	3 mm
Synchronous Rectifier	No
Topology	Charge Pump
Voltage - Input (Max)	5.5 V
Voltage - Input (Min)	2.7 V
Voltage - Output (Min/Fixed)	1.5 V

LTC3251 Series

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

Part	Package Name	Number of Outputs	Function	Output Type	Synchronous Rectifier	Voltage - Input (Max)	Mounting Type	Topology	Frequency - Switching (Min)	Frequency - Switching (Max)	Operating Temperature (Max)	Operating Temperature (Min)	Voltage - Output (Min/Fixed)	Voltage - Input (Min)	Output Configuration	Voltage - Output (Max)	Package Width	Package Features	Package Length	Current - Output
Analog Devices Inc./Maxim Integrated LTC3251EMSE#PBF	10-MSOP 10-MSOP-EP	1	Step-Down	Adjustable	No	5.5 V	Surface Mount	Charge Pump	1 MHz	1.6 MHz	85 °C	-40 °C	0.9 V	2.7 V	Positive	1.6 V	3 mm	Exposed Pad	0.118 in	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE-1.2#PBF	10-MSOP 10-MSOP-EP	1	Step-Down	Fixed	No	5.5 V	Surface Mount	Charge Pump	1 MHz	1.6 MHz	85 °C	-40 °C	1.2 V	2.7 V	Positive		3 mm	Exposed Pad	0.118 in	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE-1.5#PBF	10-MSOP 10-MSOP-EP	1	Step-Down	Fixed	No	5.5 V	Surface Mount	Charge Pump	1 MHz	1.6 MHz	85 °C	-40 °C	1.5 V	2.7 V	Positive		3 mm	Exposed Pad	0.118 in	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE-1.2#TRPBF	10-MSOP 10-MSOP-EP	1	Step-Down	Fixed	No	5.5 V	Surface Mount	Charge Pump	1 MHz	1.6 MHz	85 °C	-40 °C	1.2 V	2.7 V	Positive		3 mm	Exposed Pad	0.118 in	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE-1.5#TRPBF	10-MSOP 10-MSOP-EP	1	Step-Down	Fixed	No	5.5 V	Surface Mount	Charge Pump	1 MHz	1.6 MHz	85 °C	-40 °C	1.5 V	2.7 V	Positive		3 mm	Exposed Pad	0.118 in	500 mA
Analog Devices Inc./Maxim Integrated LTC3251EMSE#TRPBF	10-MSOP 10-MSOP-EP	1	Step-Down	Adjustable	No	5.5 V	Surface Mount	Charge Pump	1 MHz	1.6 MHz	85 °C	-40 °C	0.9 V	2.7 V	Positive	1.6 V	3 mm	Exposed Pad	0.118 in	500 mA

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

Spread Spectrum Frequency Modulation Reduces EMI

LTC3251EMSE-1.5#PBF | Datasheet

R415 Reliability Data