May 4, 2016 – Texas Instruments (TI) introduced two 65-V, 150-mA synchronous DC/DC buck converters with a 10.5-uA quiescent current (I Q ) for powering factory automation and automotive sensor applications requiring high efficiency. The industrial-grade LM5165 and automotive-grade LM5165-Q1 micro-power step-down regulators feature a wide input voltage (V IN ) range and dual control modes for optimizing efficiency and printed circuit board (PCB) area.
The wide 3-V to 65-V operating range enables the LM5165 and LM5165-Q1 micro-power regulators to handle high transients in industrial sensor and programmable logic controller (PLC) applications, as well as start-stop and load-dump conditions for 12-V/24-V lead-acid and emerging 48-V lithium-ion automotive batteries. Integrated dual metal-oxide semiconductor field-effect transistors (MOSFETs) reduce PCB area, while a programmable current-limit scheme reduces inductor size. Both regulators operate at junction temperatures up to 150ºC for higher temperature environments. The LM5165-Q1 is AEC-Q100 qualified for automotive applications.
LM5165 and LM5165-Q1 key features and benefits
- Low 10.5-uA standby IQ (operating with no load) enables 90-percent conversion efficiency at 1-mA to 10-mA loads to extend battery life in “always on” applications.
- 100-percent duty cycle enables low-dropout operation, while a P-channel high-side MOSFET eliminates the bootstrap diode and capacitor.
- Dual-mode operation: a pulse frequency modulation (PFM) control mode enables efficient power supply design, while a constant on-time (COT) control mode provides higher output current and better electromagnetic interference (EMI) performance.
- Fixed 3.3-V and 5-V options eliminate external feedback resistor dividers.
