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MP2234 Datasheet(PDF) 11 Page - Monolithic Power Systems

Part # MP2234
Description  High-Efficiency, 2A, 16V, 800kHz Synchronous, Step-Down Converter
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2234 Datasheet(HTML) 11 Page - Monolithic Power Systems

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MP2234
– SYNCHRONOUS STEP-DOWN CONVERTER
MP2234 Rev. 1.0
www.MonolithicPower.com
11
5/16/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
Figure 3
: Adjustable UVLO
Soft-Start
Adjust the soft-start time by connecting a
capacitor from SS pin to ground. When the soft-
start begins, an internal 11µA current source
charges the external capacitor. During soft-
start, the soft-start capacitor connects to the
non-inverting input of the error amplifier. The
soft-start period continues until the voltage on
the
soft-start
capacitor
exceeds
the
0.8V
reference. Then the non-inverting amplifier uses
the reference voltage takes as the input. Use
the following equation to calculate the soft-start
time:
SS
0.8V Css(nF)
t (ms)
11 A
Power Save Mode for Light Load Condition
The
MP2234
has
AAM
(Advanced
Asynchronous Modulation) power save mode
for light load. The AAM voltage is set at 0.6V
internally. Under the heavy load condition, the
VCOMP is higher than VAAM. When clock goes
high, the high-side power MOSFET turns on
and remains on until VILsense reaches the value
set by the COMP voltage. The internal clock
resets every time when VCOMP is higher than
VAAM.
Under the light load condition, the value of
VCOMP is low. When VCOMP is less than VAAM and
VFB is less than VREF, VCOMP ramps up until it
exceeds VAAM, during this time, the internal
clock is blocked, thus the MP2234 skips some
pulses for PFM (Pulse Frequency Modulation)
mode and achieves the light load power save.
Figure 4: Simplified AAM Control Logic
When the load current is light, the inductor peak
current is set internally which is about 0.9A for
VIN=12V, VOUT=3.3V, and L=4.7μH.
Over-Current-Protection and Hiccup
The MP2234 has a cycle-by-cycle over-current
limit when the inductor current peak value
exceeds
the
set
current
limit
threshold.
Meanwhile, the output voltage drops until VFB is
below the Under-Voltage (UV) threshold
typically 50% below the reference. Once UV is
triggered, the MP2234 enters hiccup mode to
periodically restart the part. This protection
mode is especially useful when the output is
dead-shorted to ground, and greatly reduces
the average short circuit current to alleviate
thermal issues and protect the regulator. The
MP2234 exits the 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 reaches temperatures that
exceed 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. This
UVLO’s rising threshold is 2.2V with a
hysteresis of 150mV. The bootstrap capacitor
voltage is regulated internally by VIN through
D1, M1, R3, C4, L1 and C2 (Figure 5). If (VIN-
VSW) exceeds 5V, U1 will regulate M1 to
maintain a 5V BST voltage across C4. A 2
resistor placed between SW and BST cap. is
strongly recommended to reduce SW spike
voltage.


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