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MP2130 Datasheet(PDF) 9 Page - Monolithic Power Systems

Part # MP2130
Description  High Efficiency, 3.5A, 6V, 1.2MHz Synchronous Step-Down Converter in an Ultra?밪mall QFN12 (2x2mm) Package
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2130 Datasheet(HTML) 9 Page - Monolithic Power Systems

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MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
MP2130 Rev. 1.23
www.MonolithicPower.com
9
11/22/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
OPERATION
MP2130 uses constant on-time control with
input voltage feed forward to stabilize the
switching frequency over full input range. At
light load, MP2130 employs a proprietary
control of low side switch and inductor current
to eliminate ringing on switching node and
improve efficiency.
Constant On-time Control
Compare to fixed frequency PWM control,
constant on-time control offers the advantage of
simpler control loop and faster transient response.
By using input voltage feed forward, MP2130
maintains a nearly constant switching frequency
across input and output voltage range. The on-
time of the switching pulse can be estimated as:
OUT
ON
IN
V
T0.833 s
V
=⋅
μ
To prevent inductor current run away during load
transient, MP2130 fixes the minimum off time to
be 30ns. However, this minimum off time limit will
not affect operation of MP2130 in steady state in
any way.
Light Load Operation
In light load condition, MP2130 uses a
proprietary control scheme to save power and
improve efficiency. Instead of turning off the low
side switch immediately when inductor current
start to reverse, MP2130 gradually ramp down
and regulates the low side switch current to a
minimal level, thus avoids the ringing at
switching
node
that
always
occurs
in
discontinuous
conduction
mode
(DCM)
operation
Enable
When input voltage is greater than the under-
voltage lockout threshold (UVLO), typically 2.5V,
MP2130 can be enabled by pulling EN pin to
higher than 1.2V. Leaving EN pin float or pull
down to ground will disable MP2130. There is
an internal 1Meg Ohm resistor from EN pin to
ground.
Soft Start/Stop
MP2130 has built-in soft start that ramps up the
output voltage in a controlled slew rate,
avoiding overshoot at startup. The soft start
time is about 1ms typical. At disable, MP2130
ramps down the internal reference thus allow
the load to linearly discharge the output.
Power Good Indicator
MP2130 has an open drain with 500kΩ pull-up
resistor pin for power good indicator PG. When
FB pin is within +/-10% of regulation voltage, i.e.
0.6V, PG pin is pulled up to IN by the internal
resistor. If FB pin voltage is out of the +/-10%
window, PG pin is pulled down to ground by an
internal MOS FET. The MOS FET has a
maximum Rdson of less than 100Ω.
Current limit
MP2130 has a typical 4.5A current limit for the
high side switch. When the high side switch hits
current limit, MP2130 will touch the hiccup
threshold until the current lower down. This will
prevent inductor current from continuing to build
up which will result in damage of the
components.
Short Circuit and Recovery
MP2130 enters short circuit protection mode
when the inductor current hits the current limit,
and tries to recover from short circuit with
hiccup mode. In short circuit protection,
MP2130 will disable output power stage,
discharge soft-start cap and then automatically
try to soft-start again. If the short circuit
condition still holds after soft-start ends,
MP2130 repeats this operation cycle till short
circuit disappears and output rises back to
regulation level.


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