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LTC3335 - Nanopower Buck-Boost DC/DC with Integrated Coulomb Counter

The LTC®3335 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 the IRQ pin.

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.

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 Typical Application

Applications Long Lifetime Primary Cell Battery Applications Wireless Sensors Remote Monitors Dust Networks® SmartMesh® Applications Packaging

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