The LM20333 is a full featured synchronous buck regulator capable of delivering up to 3A
of load current. The current mode control loop is externally compensated with only two components,
offering both high performance and ease of use. The device is optimized to work over the input
voltage range of 4.5V to 36V making it well suited for high voltage systems.
The device features internal Over Voltage Protection (OVP) and Over Current Protection
(OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows
the turn on of the device to be tightly controlled and sequenced. Startup inrush currents are
limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection
and supply sequencing are possible with the integrated power good (PGOOD) circuit.
The LM20333 is designed to work well in multi-rail power supply architectures. The output
voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the
output of the LM20333 is pre-biased at startup it will not sink current to pull the output low
until the internal soft-start ramp exceeds the voltage at the feedback pin.
The switching frequency of the LM20333 can be synchronized to an external clock by use of
the SYNC pin. The SYNC pin is capable of synchronizing to input signals ranging from 250 kHz to 1.5
The LM20333 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to
the PCB, eliminating the need for bulky heatsinks.
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