LTC3335 Datasheet | Linear Technology

Features n680n A Input Quiescent Current (Output in Regulation at No Load) n1.8V to 5.5V Input Operating Range n Selectable Output Voltages of 1.8V, 2.5V, 2.8V, 3V, 3.3V, 3.6V, 4.5V, 5V n Integrated Coulomb Counter Measures Accumulated Battery Discharge n±5% Battery Discharge Measurement Accuracy n Programmable Peak Input Current of 5m A, 10m A, 15m A, 25m A, 50m A, 100m A, 150m A, 250m A n Up to 50m A of Output Current n Up to 90% Efficiency n Programmable Coulomb Counter Prescaler for Wide Range of Battery Sizes n Programmable Discharge Alarm Threshold n I2C Interface n Low Profile (0.75mm) 20-Lead (3mm × 4mm) QFN Package Applications n Long Lifetime Primary Cell Battery Applications n Wireless Sensors n Remote Monitors n Dust Networks® Smart Mesh® Applications LTC3335 Nanopower Buck-Boost DC/DC with Integrated Coulomb Counter Description The LTC®3335 is a high efficiency, low quiescent current (680n A) 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 50m A 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 acmodate a wide range of battery types and sizes, the peak input current can be selected from as low as 5m A to as high as 250m A 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. L, LT, LTC, LTM, Linear Technology, the Linear logo, Smart Mesh and Dust Networks are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application 2.2m H TO 47µH + PRIMARY...