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MP2233 Datasheet(PDF) 11 Page - Monolithic Power Systems

No. de pieza MP2233
Descripción Electrónicos  High-Efficiency, 3A, 16V, 1.4MHz Synchronous, Step-Down Converter
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Fabricante Electrónico  MPS [Monolithic Power Systems]
Página de inicio  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2233 Datasheet(HTML) 11 Page - Monolithic Power Systems

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MP2233 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MP2233 Rev. 1.01
www.MonolithicPower.com
11
12/6/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
enough hysteresis to allow for any input supply
variations.
Figure 3: Adjustable UVLO
External Soft-Start
The
MP2233
employs
a
soft-start
(SS)
mechanism to ensure smooth output during
power-up. When the EN pin goes high, an
internal current source (14μA) charges the SS
capacitor. The SS capacitor voltage overtakes
the REF voltage to the PWM comparator. The
output voltage smoothly ramps up with the SS
voltage. Once the SS voltage reaches the same
level as the REF voltage, it keeps ramping up
while VREF takes over the PWM comparator. At
this point, the soft-start finishes and the device
enters steady state operation.
If the output is pre-biased to a certain voltage
during startup, the IC will disable the switching
of both high-side and low-side switches until the
voltage on the internal soft-start capacitor
exceeds the sensed output voltage at the FB
pin.
The SS capacitor value can be determined as
follows:
()
( )
( )
()
SS
SS
SS
REF
ms
I
A
CnF
VV
τ×
μ
=
(1)
If the output capacitors have large capacitances,
avoid setting a short SS time to avoid hitting the
current limit during SS. Use a minimum value of
4.7nF if the output capacitance value is larger
than 330μF.
Over-Current-Protection and Hiccup
The MP2233 has a cycle-by-cycle over-current
limit that protects against the inductor current
peak value exceeding the set current limit
threshold.
Under-voltage
protection
(UVP)
triggers if the FB voltage drops below the
under-voltage (UV) threshold—typically 50%
below the reference. Once UVP triggers, the
MP2233 enters hiccup mode to periodically
restart the part. This protection mode is
especially useful when the output is dead-
shorted to ground. The average of short-circuit
current falls to alleviate thermal issues and to
protect the regulator. The MP2233 exits hiccup
mode once the over-current condition is
removed.
Thermal Shutdown
Thermal shutdown prevents the chip from
operating at exceedingly high temperatures.
When the silicon die temperature exceeds
150°C, it shuts down the whole chip. When the
temperature drops below its lower threshold
(typically 130°C) the chip is enabled again.
Floating Driver and Bootstrap Charging
An external bootstrap capacitor powers the
floating power MOSFET driver. This floating
driver has its own UVLO protection with a rising
threshold of 2.2V and a hysteresis of 150mV.
The bootstrap capacitor voltage is regulated
internally by VIN through D1, M1, R3, C4, L1
and C2 (Figure 4). If (VIN-VSW) exceeds 5V, U1
will regulate M1 to maintain a 5V BST voltage
across C4. A 20Ω resistor placed between SW
and BST capacitor is strongly recommended to
reduce SW voltage spikes.
R3
Figure 4: Internal Bootstrap Charging Circuit


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