The LM20143 is a full featured adjustable frequency synchronous buck regulator capable of delivering up to 3A 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 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.
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.
The LM20143 is offered in a 16-pin eTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need
for bulky heatsinks.
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
RoHS Compliance Information
