STEVAL-ISA052V2 Datasheet, PDF (1/4 Pages) STMicroelectronics – Negative current limit

STEVAL-ISA052V2
Features
Evaluation board for the PM6675AS high efficiency
step-down controller with embedded 2 A LDO regulator
Data Brief
■ 4.5 V to 36 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 using
constant on-time (COT) control loop
■ No RSENSE current sensing using R_DS(ON) of
the low-side MOSFETs
■ 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
STEVAL-ISA052V2
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
This evaluation board is based on the PM6675AS
device, which consists of a single high efficiency
step-down controller and an independent low-
dropout (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
applications. The LDO linear regulator can sink
May 2008
Rev 1
For further information contact your local STMicroelectronics sales office.
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