150-mA synchronous DC/DC regulators optimize light-load efficiency for factory automation and automotive applications
Texas Instruments (TI) introduced two 65-V, 150-mA synchronous DC/DC buck converters with the industry's lowest 10.5-µA quiescent current (IQ) 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 (VIN) range and dual control modes for optimizing efficiency and printed circuit board (PCB) area. By using the regulators together with TI's WEBENCH® Power Design tool, engineers can get their factory and process automation designs to market faster.
The wide 3-V to 65-V operating range enables the LM5165 and LM5165-Q1 micro-power regulators to handle the highest 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 150 °C for higher temperature environments. The LM5165-Q1 is AEC-Q100 qualified for automotive applications.
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| The LM5165EVM-HD-C50X evaluation module. |
LM5165 and LM5165-Q1 key features and benefits
- Low 10.5-µA 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.
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| Typical Efficiency, VOUT = 5 V. |
- 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 the highest efficiency 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 to lower bill of materials (BOM).
- Programmable current limit optimizes inductor size and cost.
The LM5165 and LM5165-Q1 join TI's family of wide VIN DC/DC step-down regulators that include the LM5017, LM5160 and TPS54062.
Availability, packaging and pricing
The regulators are available in volume now from TI and its authorized distributors. Packaged in a 10-pin, 3-mm-by-3-mm VSON, the industrial-grade LM5165 is priced at US$1.35 in 1,000-unit quantities and the automotive-grade LM5165-Q1 is priced at US$1.58. Order the high-density COT LM5165EVM-HD-C50X and PFM LM5165EVM-HD-P50A evaluation modules.
