Wide bandwidth voltage mode control loop, partial internal compensation
Fixed switching frequency of 500 kHz or 1 MHz
35 mΩ integrated MOSFET switches
Adjustable output voltage down to 0.8V
Optimized reference voltage initial accuracy and temperature drift
External soft-start control with tracking capability
Enable pin with hysteresis
Low standby current of 230 µA
Pre-biased load startup capability
Integrated UVLO, OCP and thermal shutdown
100% duty cycle capability
eTSSOP-16 exposed pad package
Description
The LM2854 PowerWise
® SIMPLE SWITCHER
® buck regulator is a 500 kHz or 1 MHz step-down switching voltage regulator capable of driving up to a 4A load with exceptional
power conversion efficiency, line and load regulation, and output accuracy. The LM2854 can accept an input voltage rail between
2.95V and 5.5V and deliver an adjustable and highly accurate output voltage as low as 0.8V. Externally established soft-start
with a small capacitor facilitates controlled start-up, and the LM2854 is capable of starting gracefully into a pre-biased
output voltage. Partial internal compensation reduces the number of external passive components and PC board space typically
necessary in a voltage mode buck converter application, yet preserving flexibility to deal with ceramic and/or electrolytic
based load capacitors. Lossless cycle-by-cycle peak current limit is used to protect the load from an overcurrent or short-circuit
fault, and an enable comparator simplifies sequencing applications. The LM2854 is available in an exposed pad TSSOP-16 package
that enhances the thermal performance of the regulator.
The LM2854 PowerWise® SIMPLE SWITCHER® buck regulator evaluation board is a 1 MHz step-down voltage regulator capable of driving 0A up to 4A load current with excellent power conversion efficiency. The LM2854 evaluation board is designed to accept in input voltage rail between 2.95V and 5.5V and deliver a fixed and highly accurate output voltage of 1.2V. The output voltage level can be changed by modification of the one feedback resistor value. Externally established soft-start with a small value capacitance facilitates a controlled, well-defined and monotonic start-up output voltage characteristic. In addition, the LM2854 is capable of starting monotonically and glitch free into a pre-biased load.
The LM2854 PowerWise® SIMPLE SWITCHER® buck regulator evaluation board is a 500 kHz step-down voltage regulator capable of driving from 0A to 4A load current with excellent power conversion efficiency. The LM2854 TSSOP-16 evaluation board is designed to accept an input voltage rail between 2.95V and 5.5V and deliver a fixed and highly accurate output voltage of 1.2V. The output voltage level can be changed by modification of one feedback resistor. The device allows external soft-start and monotonical, glitch free into a pre-biased start. Lossless cycle-by-cycle peak current limit is used to protect the load from an overcurrent or short-circuit fault, and an enable comparator permits system sequencing or increase of the input UVLO above the nominal 2.7V level.
National Semiconductor follows the provisions of the Product Stewardship Guide for Customers
(CSP-9-111C1)
and Banned Substances and Materials of Interest Specification
(CSP-9-111S2)
for regulatory environmental compliance. Details may be found at:
www.national.com/en/packaging/greennopb.html.
Lead free products are RoHS compliant.
Lead Free product status is available through the search tool located
here
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.
LM20124
