Switching regulator maximises energy utilisation
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Microchip has announced the MCP1603 synchronous buck regulator, which combines high operating efficiency with power-saving features to maximise battery lifetime in portable and remotely-located equipment. |
The MCP1603 operates at up to 90% efficiency,
has 45µA quiescent current with 100nA
standby current, and saves further energy
by transitioning automatically between PWM
operation under heavy-load conditions and
PFM operation for light-loads. With Under-
Voltage Lockout (UVLO), over-temperature
protection and over-current protection also
included, the low overall power consumption
of the MCP1603 not only enhances battery life but
also reduces heat dissipation
and eases thermal design.
The input voltage range
from 2.7V to 5.5V allows use
with a single-cell Li-ion power
source as well as two-cell or
three-cell NiMH and NiCd
batteries. Two package
options serve space-sensitive
portable applications,
providing designers with a
choice of 5-lead TSOT-23 or
DFN-8 outlines.
The MCP1603 is available
with either an adjustable
output voltage from 0.8V to
4.5V, or a fixed output voltage
of 1.2V, 1.5V, 1.8V, 2.5V, or 3.3V. When a fixed
option is used, only three additional external
components are required.
FEATURES
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- 500mA output current
- 2MHz PWM switching frequency
- 100%-duty-cycle operation
- Shutdown pin
- Internal compensation circuitry
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APPLICATIONS
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- USB-powered devices
- Digital cameras
- Portable instruments
- Remote data loggers
- 5V or 3.3V distributed systems
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