The LM20154 is a full featured 1 MHz synchronous buck regulator capable of delivering up
to 4A of continuous output current. The current mode control loop can be compensated to be stable
with virtually any type of output capacitor. For most cases, compensating the device only requires
two external components, providing maximum flexibility and ease of use. The device is optimized to
work over the input voltage range of 2.95V to 5.5V making it suited for a wide variety of low
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. Start-up inrush currents are
limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault detection
and supply sequencing is possible with the integrated power good circuit.
The LM20154 features an open drain SYNCOUT pin which provides an external clock that
matches the switching frequency of the device but is shifted by 180 degrees.
The LM20154 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 LM20154 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 LM20154 is offered in an exposed pad 16-pin HTSSOP package that can be soldered to
the PCB, eliminating the need for bulky heatsinks.
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