LTC3335 Series

Nanopower Buck-Boost DC/DC with Integrated Coulomb Counter

Catalog

Nanopower Buck-Boost DC/DC with Integrated Coulomb Counter

Part	Package / Case	Voltage - Output (Min/Fixed)	Output Type	Mounting Type	Output Configuration	Synchronous Rectifier	Voltage - Output (Max)	Voltage - Input (Max) [Max]	Current - Output	Topology	Voltage - Input (Min) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Function	Supplier Device Package	Number of Outputs
Analog Devices LTC3335EUDC#PBF	20-WFQFN Exposed Pad	1.8 V	Programmable	Surface Mount	Positive		5 V	5.5 V	50 mA	Buck-Boost	1.8 V	-40 °C	125 ¯C	Step-Up/Step-Down	20-QFN (3x4)	1

Catalog

Nanopower Buck-Boost DC/DC with Integrated Coulomb Counter

Key Features

• 680nA Input Quiescent Current (Output in Regulation at No Load)

• 1.8V to 5.5V Input Operating Range

• Selectable Output Voltages of 1.8V, 2.5V, 2.8V, 3V, 3.3V, 3.6V, 4.5V, 5V

• Integrated Coulomb Counter Measures Accumulated Battery Discharge

• ±5% Battery Discharge Measurement Accuracy

• Programmable Peak Input Current of 5mA, 10mA, 15mA, 25mA, 50mA, 100mA, 150mA, 250mA

• Up to 50mA of Output Current

• Up to 90% Efficiency

• Programmable Coulomb Counter Prescaler for Wide Range of Battery Sizes

• Programmable Discharge Alarm Threshold

• I2C Interface

• Low Profile (0.75mm) 20-Lead (3mm × 4mm) QFN Package

Description

The LTC3335 is a high efficiency, low quiescent current (680nA) buck-boost DC/DC converter with an integrated precision coulomb counter which monitors accumulated battery discharge in long life battery powered applications. The buck-boost can operate down to 1.8V on its input and provides eight pin-selectable output voltages with up to 50mA of output current.The coulomb counter stores the accumulated battery discharge in an internal register accessible via an I2C interface. The LTC3335 features a programmable discharge alarm threshold. When the threshold is reached, an interrupt is generated at theIRQpin.To accommodate a wide range of battery types and sizes, the peak input current can be selected from as low as 5mA to as high as 250mA and the full-scale coulomb counter has a programmable range of 32,768:1.The LTC3335 is available in a 3mm × 4mm QFN-20 package.ApplicationsLong Lifetime Primary Cell Battery ApplicationsWireless SensorsRemote MonitorsDust Networks®SmartMesh®Applications