The LM5166 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 500 mA of
output current can be delivered at fixed output voltages of 3.3 V or 5 V, or 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/adjustable startup timing options include minimum delay (no soft-start), internally
fixed (900 μs), and externally programmable soft-start via an external capacitor. An open-drain
PGOOD indicator can be used for sequencing and output voltage monitoring. The
LM5166 is available in a VSON-10 package with
0.5-mm pin pitch. To create a custom regulator design,
use the LM5166 with
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