Here's a synchronous, current-mode,
step-down dc-dc controller with differential
output voltage sensing. Using a pair of
VSENSE inputs like this enables high-accuracy regulation in high-current applications.
Linear Technology's LTC3823 can either
sense the voltage drop across the synchronous power MOSFET, or where control of
maximum output current is important, it
can be used with a sense resistor in series
with the source of the lower MOSFET. It has
a 4.5- to 30-V input-voltage range and can
develop output voltages from 0.6 V to 90%
of the input voltage (or 0.6 to 3.3 V with
remote sensing).
Output voltage accuracy is ±0.5% at
room temperature and ±0.67% from 0°C to
85°C. Tracking and sequencing functions
allow the controller to power-up and power-down multiple power supplies. In addition,
the LTC3823 can be configured for phase-locked-loop frequency synchronization.
Pricing in quantities of 1000 units starts
at $2.75.
Linear Technology
www.linear.com
Here's a synchronous, current-mode,
step-down dc-dc controller with differential
output voltage sensing. Using a pair of
VSENSE inputs like this enables high-accuracy regulation in high-current applications.
Linear Technology's LTC3823 can either
sense the voltage drop across the synchronous power MOSFET, or where control of
maximum output current is important, it
can be used with a sense resistor in series
with the source of the lower MOSFET. It has
a 4.5- to 30-V input-voltage range and can
develop output voltages from 0.6 V to 90%
of the input voltage (or 0.6 to 3.3 V with
remote sensing).
Output voltage accuracy is ±0.5% at
room temperature and ±0.67% from 0°C to
85°C. Tracking and sequencing functions
allow the controller to power-up and power-down multiple power supplies. In addition,
the LTC3823 can be configured for phase-locked-loop frequency synchronization.
Pricing in quantities of 1000 units starts
at $2.75.
Linear Technology
www.linear.com