LT3470A Series

Micropower Buck Regulator with Integrated Boost and Catch Diodes

Catalog

Micropower Buck Regulator with Integrated Boost and Catch Diodes

Part	Current - Output	Operating Temperature [Min]	Operating Temperature [Max]	Function	Output Type	Voltage - Output (Max)	Voltage - Output (Min/Fixed)	Voltage - Input (Min) [Min]	Supplier Device Package	Mounting Type	Package / Case	Output Configuration	Topology	Number of Outputs
Analog Devices LT3470EDDB#TRPBF	200 mA	0 °C	85 C	Step-Down	Adjustable	16 V	1.25 V	4 V	8-DFN (3x2)	Surface Mount	8-WFDFN Exposed Pad	Positive	Buck	1
Analog Devices LT3470IDDB#TRPBF	200 mA	-40 °C	125 ¯C	Step-Down	Adjustable	16 V	1.25 V	4 V	8-DFN (3x2)	Surface Mount	8-WFDFN Exposed Pad	Positive	Buck	1
Analog Devices LT3470HDDB#TRPBF	200 mA	-40 °C	150 °C	Step-Down	Adjustable	16 V	1.25 V	4 V	8-DFN (3x2)	Surface Mount	8-WFDFN Exposed Pad	Positive	Buck	1
Analog Devices LT3470ITS8#TRMPBF	200 mA	-40 °C	125 ¯C	Step-Down	Adjustable	16 V	1.25 V	4 V	TSOT-23-8	Surface Mount	SOT-23-8 Thin TSOT-23-8	Positive	Buck	1
Analog Devices LT3470HTS8#TRMPBF	200 mA	-40 °C	150 °C	Step-Down	Adjustable	16 V	1.25 V	4 V	TSOT-23-8	Surface Mount	SOT-23-8 Thin TSOT-23-8	Positive	Buck	1
Analog Devices LT3470AIDDB#TRPBF	250 mA	-40 °C	125 ¯C	Step-Down	Adjustable	16 V	1.25 V	4 V	8-DFN (3x2)	Surface Mount	8-WFDFN Exposed Pad	Positive	Buck	1

Catalog

Micropower Buck Regulator with Integrated Boost and Catch Diodes

Key Features

• Low Quiescent Current: 35µA at 12VINto 3.3VOUT

• Integrated Boost and Catch Diodes

• Input Range: 4V to 40V

• 3.3V at 250mA from 4V to 40V Input

• 5V at 250mA from 5.7V to 40V Input

• Low Output Ripple: <10mV

• <1µA in Shutdown Mode

• Output Voltage: 1.25V to 16V

• Hysteretic Mode ControlLow Ripple Burst Mode®Operation at Light LoadsContinuous Operation at Higher Loads

• Low Ripple Burst Mode®Operation at Light Loads

• Continuous Operation at Higher Loads

• Solution Size as Small as 50mm2

• Low Profile (0.75mm) 2mm × 3mm Thermally Enhanced 8-Lead DFN Package

• AEC-Q100 Qualified for Automotive Applications

Description

The LT3470A is a micropower step-down DC/DC converter that integrates a 440mA power switch, catch diode and boost diode into low profile 2mm × 3mm DFN package. The LT3470A combines Burst Mode and continuous operation to allow the use of tiny inductor and capacitors while providing a low ripple output to loads of up to 250mA.With its wide input range of 4V to 40V, the LT3470A can regulate a wide variety of power sources, from 2-cell Li-Ion batteries to unregulated wall transformers and lead-acid batteries. Quiescent current in regulation is just 35µA in a typical application while a zero current shutdown mode disconnects the load from the input source, simplifying power management in battery-powered systems. Fast current limiting and hysteretic control protects the LT3470A and external components against shorted outputs, even at 40V input. The LT3470A has higher output current and improved start-up and dropout performance compared to the LT3470.Vin Min StartupSwitch CurrentLT34705.5V300mALT3470A4V400mAApplicationsAutomotive Battery RegulationPower for Portable ProductsDistributed Supply RegulationIndustrial SuppliesWall Transformer Regulation