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MP4561DQ Datasheet(PDF) 7 Page - Monolithic Power Systems

Part # MP4561DQ
Description  1.5A, 2MHz, 55V Step-Down Converter
Download  17 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP4561DQ Datasheet(HTML) 7 Page - Monolithic Power Systems

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MP4561 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER
MP4561 Rev. 1.0
www.MonolithicPower.com
7
11/5/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
BLOCK DIAGRAM
--
+
LOGIC
--
+
COMP
ISW
VIN
BST
SW
FREQ
GND
COMP
FB
EN
SS
0V8
REFERENCE
UVLO
INTERNAL
REGULATORS
OSCILLATOR
Figure 1—Functional Block Diagram
OPERATION
The MP4561 is a programmable frequency,
non-synchronous, step-down switching regulator
with an integrated high-side high voltage power
MOSFET. It provides a single highly efficient
solution with current mode control for fast loop
response and easy compensation. It features a
wide input voltage range, external soft-start
control for start-up ramp-up flexibility, and
precision current limiting. Its very low operational
quiescent current makes it suitable for battery
powered applications.
PWM Control Mode
At moderate to high output current, the MP4561
operates in a fixed frequency, peak current
control mode to regulate the output voltage. A
PWM cycle is initiated by the internal clock. The
power MOSFET is turned on and remains on
until its current reaches the value set by the
COMP voltage. When the power switch is off, it
remains off for at least 100ns before the next
cycle starts. If, in one PWM period, the current in
the power MOSFET does not reach the COMP
set current value, the power MOSFET remains
on, saving a turn-off operation.
Pulse Skipping Mode
Under
light
load
condition
the
switching
frequency stretches down zero to reduce the
switching loss and driving loss.
Error Amplifier
The error amplifier compares the FB pin voltage
with the internal reference (REF) and outputs a
current proportional to the difference between the
two. This output current is then used to charge
the external compensation network to form the
COMP voltage, which is used to control the
power MOSFET current.


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