The LM20143 devices are full featured PowerWise™
adjustable frequency synchronous buck regulators capable of delivering up to 3 A 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 2.95 V to 5.5 V, making it suited for a wide variety of low voltage
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 frequency of this device can be adjusted from 500 kHz to 1.5 MHz by connecting an
external resistor from the RT pin to ground.
The LM20143 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 LM20143 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.
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