STEVAL-ISA052V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – Negative current limit

STEVAL-ISA052V1
High efficiency step-down controller with embedded 2 A LDO
regulator demonstration board based on the PM6675S
Data brief
Features
■ 4.5 V to 28 V input voltage range
■ 0.6 V, ±1 % voltage reference
■ 1.5 V fixed output voltage
■ 0.6 V to 3.3 V adjustable output voltage
■ 1.237 V ±1 % reference voltage available
■ Very fast load transient response constant on-
time loop control
■ No-RSENSE current sensing using low-side
MOSFETs’ R_DS(on)
■ Negative current limit
■ Latched OVP, UVP and thermal shutdown
■ Fixed 3 ms soft-start
■ Selectable pulse-skipping at light load
■ Selectable no-audible (33 kHz) pulse-skip
mode
■ All ceramic output capacitors application
supported
■ Output voltage ripple compensation
■ Output soft-end
■ RoHS compliant
STEVAL-ISA052V1
applications. The LDO linear regulator can sink
and source up to 2 Apk. Two fixed current limits
(±1 A and ±2 A) can be chosen.
An active soft-end is independently performed on
both the switching and the linear regulator outputs
when disabled.
Description
The STEVAL-ISA052V1 demonstration board is
based on the PM6675S device which consists of
a single high efficiency step-down controller and
an independent low drop-out (LDO) linear
regulator.
The constant on-time (COT) architecture assures
fast transient response supporting both
electrolytic and ceramic output capacitors. An
embedded integrator control loop compensates
the DC voltage error due to the output ripple.
Selectable low-consumption mode allows the
highest efficiency over a wide range of load
conditions. The low-noise mode sets the minimum
switching frequency to 33 kHz for audio-sensitive
November 2010
Doc ID 18215 Rev 1
For further information contact your local STMicroelectronics sales office.
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