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MP2110 Folha de dados(PDF) 11 Page - Monolithic Power Systems

Nome de Peças MP2110
Descrição Electrónicos  3A Synchronous Step-Down Converter with Programmable Input Current Limit
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Fabricante Electrônico  MPS [Monolithic Power Systems]
Página de início  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2110 Folha de dados(HTML) 11 Page - Monolithic Power Systems

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MP2110 – 3A SYNCHRONOUS BUCK CONVERTER WITH INPUT CURRENT LIMIT
MP2110 Rev. 1.11
www.MonolithicPower.com
11
9/26/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
Output over Voltage Clamp
As the system input voltage rises up and the
current limit switch’s output exceeds its OVP
threshold 5.65V, the output voltage (REGIN) will
be clamped to 5.65V.
Current Limit Switch Output Discharge
When the current limit switch’s input SYSIN is
lower than 2.9V, MP2110 turns on the discharge
MOSFET to discharge the REGIN capacitor
storage. Discharge resistance is typical 8.5Ω and
the specific discharge time depends on the
capacitance between REGIN and GND.
Negative
Thermal
Coefficient
(NTC)
Thermistor
The MP2110 has a built-in NTC comparator that
allows it to sense the external device’s
temperature via the thermistor mounted near the
device. It ensures a safe operating environment
and prevents any smoke and fire happen due to
over temperature. Connect an appropriately-
valued resistor from SYSIN to the NTC-pin and
connect the thermistor from the NTC-pin to
AGND. The resistor divider with a dividing ratio
depends on device temperature determines the
voltage on the NTC-pin. Once the voltage at the
NTC-pin falls to 14.5% of VSYSIN, the MP2110
output is disabled. The MP2110 restarts if the
voltage rises to 27% of VSYSIN.
Thermal Shutdown
Thermal shutdown is implemented to prevent the
chip
from
operating
at
exceedingly
high
temperatures. When the silicon die temperature
is higher than 160°C, it shuts down the whole
chip. When the temperature is lower than its
lower threshold, typically 140°C, the chip is
enabled again.


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