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MP2560 Datasheet(PDF) 7 Page - Monolithic Power Systems

Part No. MP2560
Description  2.5A, 4MHz, 42V Step-Down Converter
Download  19 Pages
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Maker  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2560 Datasheet(HTML) 7 Page - Monolithic Power Systems

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MP2560 – 2.5A, 4MHz, 42V STEP-DOWN CONVERTER
MP2560 Rev. 1.2
www.MonolithicPower.com
7
1/25/2010
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
BLOCK DIAGRAM
--
+
--
+
SS Time
Gm Error Amp
SS
2.6V
5V
ISW
COMP
ISW
VIN
BST
SW
GND
FREQ
COMP
FB
EN
SS
0V8
REFERENCE UVLO/
THERMAL
SHUTDOWN
INTERNAL
REGULATORS
OSCILLATOR
--
+
SW
--
+
Level
Shift
CLK
VOUT
VIN
VOUT
Figure 1—Functional Block Diagram
OPERATION
The
MP2560
is
a
variable
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, internal soft-start control and precision
current limiting. Its very low operational
quiescent current makes it suitable for battery
powered applications.
PWM Control
At moderate to high output current, the MP2560
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.


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