advertisement Tracking and Sequencing Made Simple with
Tiny Point-of-Load Circuit – Design Note 389
Scott Jackson
Introduction
Multiple-voltage electronics systems often require
complex supply voltage tracking or sequencing, which
if not met, can result in system faults or even permanent
failures in the field. The design difficulties in meeting
these requirements are often compounded in distributedpower architectures where point-of-load (POL) DC/DC
converters or linear regulators are scattered across PC
board space, sometimes on different board planes. The
problem is that power supply circuitry is often the last
circuitry to be designed into the board, and it must be
shoehorned into whatever little board real estate is left.
Often, a simple, drop-in, flexible solution is needed to
meet these requirements.
The LTCВ®2927 provides a simple and versatile solution in
a tiny footprint for both tracking and sequencing without
the drawbacks of series MOSFETs. Furthermore, power
EARLY VIN
3.3V 0.1ВµF 138k VCC
ON 100k RAMP SDO RUN/SS IN
DC/DC RAMPBUF …