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MP2143H データシート(PDF) 11 Page - Monolithic Power Systems

部品番号 MP2143H
部品情報  3A, 5.5V, 2.0MHz Synchronous Step Down Switcher
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メーカー  MPS [Monolithic Power Systems]
ホームページ  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2143H データシート(HTML) 11 Page - Monolithic Power Systems

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MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
MP2143H Rev. 1.02
www.MonolithicPower.com
11
6/30/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
OPERATION
The MP2143H uses constant-on-time control
with input-voltage feed-forward to stabilize the
switching frequency over its full input range. It
can achieve up to 3A continuous output current
from a 2.5V to 5.5V input voltage with excellent
load and line regulation. The output voltage can
be regulated as low as 0.6V.
Constant-On-Time Control
When compared to fixed-frequency PWM control,
constant on-time control offers a simpler control
loop and faster transient response. By using
input-voltage
feed-forward,
the
MP2143H
maintains a nearly constant switching frequency
across the entire input and output voltage range.
The switching pulse ON time can be estimated as:
Ton=VOUT/VIN×0.500µs
To prevent inductor current runaway during the
load transient, the MP2143H has a fixed minimum
OFF time of 50ns. However, this minimum OFF
time limit does not affect the operation of the
MP2143H in steady state in any way.
Enable
When the input voltage exceeds the under-
voltage lockout (UVLO) threshold—typically
2.2V—the MP2143H is enabled by pulling the
EN pin above 1.2V. Leaving the EN pin floating
or grounded will disable the MP2143H. There is
an internal 1MΩ resistor from the EN pin to
ground.
Soft-Start/Stop
MP2143H has a built-in soft-start that ramps up
the output voltage at a constant slew rate that
avoids overshooting at startup. The soft-start
time is typically about 1.3ms. When disabled,
the
MP2143H
ramps
down
the
internal
reference voltage to allow the load to linearly
discharge the output.
Power Good Indicator
MP2143H has an open drain with 500kΩ pull-up
resistor pin for power good (PG) indication.
When the FB pin is within ±10% of regulation
voltage (0.6V), the PG pin is pulled up to VIN by
the internal resistor. If the FB pin voltage is
outside the ±10% window, the PG pin is pulled
to ground by an internal MOSFET. The
MOSFET has a maximum Rdson of less than
100Ω.
Current Limit
The MP2143H has a 4.8A current limit for the
high side switch (HS-FET). When the HS-FET
hits its current limit, the MP2143H enters hiccup
mode until the current drops to prevent the
inductor current from building and possibly
damaging the components.
Short Circuit and Recovery
The
MP2143H
also
enters
short-circuit
protection (SCP) mode when it hits the current
limit, and tries to recover from the short circuit
by entering hiccup mode. In SCP, the
MP2143H disables the output power stage,
discharges a soft-start capacitor, and then
enacts a soft-start procedure. If the short-circuit
condition still holds after soft-start ends, the
MP2143H repeats this operation until the short
circuit ceases and output rises back to
regulation level.


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