ST ISA049V1 User Manual
Synchronous dual buck converter with reset
demonstration board based on the ST2S06A
Features
■ Step-down current mode PWM (1.5 MHz)
DC-DC converter
■ Fixed or adjustable output voltage from 0.8 V
■ 2% DC output voltage tolerance
■ Synchronous rectification
■ Reset function
■ Internal soft start for start-up current limitation
and power ON delay of 50-100 µs
■ Typical efficiency: > 90%
■ 0.5 A output current capability
■ Non-switching quiescent current: max 1 mA
over temperature range
■ R
■ Uses tiny capacitors and inductors
■ RoHS compliant
150 mΩ (typ.)
DS(on)
STEVAL-ISA049V1
Data brief
STEVAL-ISA049V1
Description
This demonstration board is based on the
ST2S06A, a dual synchronous step-down DC-DC
converter optimized for powering low-voltage
digital cores in ODD applications and, generally,
used to replace the high current linear solution
when the power dissipation may cause a high
heating of the application environment.
It provides up to 0.5 A over an input voltage range
of 2.5 V to 5.5 V.
A high switching frequency (1.5 MHz) allows the
use of tiny surface-mount components. A resistor
divider to set the output voltage value, an inductor
and two capacitors are required for every channel.
In addition, a low output ripple is guaranteed by
the current mode PWM topology and by the use
of low ESR surface-mount ceramic capacitors.
The demonstration board is thermal protected
and current limited to prevent damage due to
accidental short-circuit.
July 2009 Doc ID 15976 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Circuit schematic STEVAL-ISA049V1
1 Circuit schematic
Figure 1. Schematic diagram
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2/4 Doc ID 15976 Rev 1
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