Linear Technology Corp.’s LT8415 low noise micropower boost converter with integrated dual half-bridge switches requires only 10.5uA of quiescent current. Integrated high value (12.4MΩ /0.4MΩ) output feedback divider resistors enable the LT8415 to regulate a 16V output with less than 70uA of total input current. Its very small 25mA switch current limit enables it to operate very efficiently from high impedance sources, such as coin cell batteries without any inrush current limitation.
The LT8415's integrated N-channel and P-channel MOSFETs in each half-bridge are synchronously controlled by a single input pin, and never turn on at the same time maximizing system reliability for applications such as MEMs relays. The internal MOSFETs are sized to drive capacitive loads ranging from a few picofarads to several nanofarads without issue. The LT8415 integrates the main switch, half-bridge switches, Schottky diodes and output disconnect on a single die, packaged in a 2x3mm DFN. The LT8415's wide 2.5V to 16V input voltage range enables it to operate from single-cell Li-ion batteries up to fixed 12V input rails, delivering outputs up to 40V. The output voltage can be adjusted dynamically by driving the FBP pin with an external voltage source.
The LT8415 can deliver over 0.7mA of average output current at 34V from a single Li-ion cell making it ideal for applications such as MEMs relays or biasing power. Both parts use a unique control technique that delivers efficiencies as high as 88 percent and low output ripple (<10mVPK-PK) over a wide load current range. Other features include integrated soft-start and overvoltage protection.
Linear Technology LT8415 low noise micropower boost converter
Linear Technology
