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MP2365 – 3A, 28V, 1.4MHz STEP-DOWN CONVERTER
MP2365 Rev. 0.91
7/10/2006
www.MonolithicPower.com
5
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
OPERATION
The MP2365 is a current-mode step-down
regulator. It regulates input voltages from 4.75V to
28V down to an output voltage as low as 0.92V,
and is able to supply up to 3A of load current.
The MP2365 uses current-mode control to
regulate the output voltage. The output voltage
is measured at FB through a resistive voltage
divider and amplified through the internal error
amplifier.
The
output
transconductance error amplifier is presented at
COMP where a network compensates the
regulation control system. The voltage at COMP
is compared to the switch current measured
internally to control the output voltage.
current
of
the
The converter uses an internal N-Channel
MOSFET switch to step-down the input voltage
to the regulated output voltage. Since the
MOSFET requires a gate voltage greater than
the input voltage, a boost capacitor connected
between SW and BS drives the gate. The
capacitor is internally charged while SW is low.
An internal 10
switch from SW to GND is used
to insure that SW is pulled to GND when SW is
low
to
fully
charge
the
BS
.
capa
LOCKOUT
COMPARATOR
ERROR
AMPLIFIER
FREQUENCY
FOLDBACK
COMPARATOR
INTERNAL
REGULATORS
1.8V
SLOPE
COMP
CLK
CURRENT
COMPARATOR
CURRENT
SENSE
AMPLIFIER
SHUTDOWN
COMPARATOR
COMP
6
IN
2
EN
7
GND
4
SS
8
OSCILLATOR
220KHz/
1.5MHz
S
R
Q
SW
3
BS
1
5V
+
Q
1.2V
+
+
2.60V/
2.39V
+
0.92V
0.6V
+
+
FB
5
--
--
--
--
--
--
Figure 1—Functional Block Diagram
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