EVAL5985 Datasheet, PDF (1/6 Pages) STMicroelectronics – 2 A step-down switching regulator demonstration board based on the L5985

EVAL5985
2 A step-down switching regulator demonstration board
based on the L5985
Data Brief
Features
■ 2 A DC output current
■ 2.9 V to 18 V input voltage
■ Output voltage adjustable from 0.6 V to 16 V
■ 250 kHz switching frequency, programmable
up to 1 MHz
■ Internal soft-start and inhibit
■ Low dropout operation: 100 % duty cycle
■ Zero-load current operation
■ Over-current and thermal protection
■ VFQFPN8 3 mm x 3 mm package
EVAL5985
!-V
Description
The EVAL5985 demonstration board provides the
design engineer with a fully functional step-down
switching regulator with an output current of up to
2 A. The board integrates STMicroelectronics’
L5985 step-down switching regulator, together
with all the external components required for a
typical application.
The rated voltage of the input capacitor and the
Schottky diode rectifier repetitive peak reverse
voltage are both 25 V, making the board capable
of covering the entire 2.9 V - 18 V input voltage
range of the L5985 device.
The board features an external resistor divider
(R1 and R2) designed for an output voltage
of 3.3 V.
The output voltage can be set to a level from 0.6 V
up to the rated voltage of the output capacitor
(16 V).
The compensation network on the demonstration
board allows the use of MLCC as output filter to
keep the loop stable. The inductor saturation
current and forward current of the Schottky diode
are within the current limit values.
The switching frequency on the demonstration
board is set to 500 kHz by means of the R5
resistor connected to pin Fsw.
January 2009
Rev 1
For further information contact your local STMicroelectronics sales office.
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www.st.com
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