The LM5165-Q1 device is
a compact, easy-to-use, 3-V to 65-V, ultra-low IQ synchronous buck converter
with high efficiency over wide input voltage and load current ranges. With integrated high-side and
low-side power MOSFETs, up to 150-mA of output current can be delivered at either fixed output
voltages of 3.3 V or 5 V or at an adjustable output. The converter is designed to simplify
implementation while providing options to optimize the performance for the target application.
Pulse Frequency Modulation (PFM) mode is selected for optimal light-load efficiency or Constant
On-Time (COT) control for nearly constant operating frequency. Both control schemes do not require
loop compensation while providing excellent line and load transient response and short PWM on-time
for large step-down conversion ratios.
The high-side P-channel MOSFET can operate at 100% duty cycle for lowest dropout voltage
and does not require a bootstrap capacitor for gate drive. Also, the current limit setpoint is
adjustable to optimize inductor selection for a particular output current requirement. Selectable
and adjustable start-up timing options include minimum delay (no soft start), internally fixed (900
µs), and externally programmable soft start using a capacitor. An open-drain PGOOD indicator can be
used for sequencing, fault reporting, and output voltage monitoring. The
LM5165-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in 10-pin VSON and VSSOP
packages with 0.5-mm pin pitch.
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