MP9141ES-LF-Z データシートの表示（PDF） - Monolithic Power Systems
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MP9141ES-LF-Z Datasheet PDF : 10 Pages
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MP9141 – 1.8A STEP-DOWN DC TO DC CONVERTER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION– INTERNAL USE ONLY
OPERATION
The MP9141 is a current-mode step-down
switch-mode regulator. It regulates input
voltages from 4.75V to 20V down to an output
voltage as low as 1.222V and is able to supply
up to 1.8A of load current. The MP9141 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
current of the 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.
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 the switch
is off. An internal 10 switch from SW to GND
is used to ensure that SW is pulled to GND
when the switch is off to fully charge the BS
capacitor.
IN 2
EN 7
INTERNAL
REGULATORS
5V
OSCILLATOR
SLOPE
COMP
42/380KHz
CLK
+
0.7V --
--
SHUTDOWN
COMPARATOR
LOCKOUT
COMPARATOR
2.30V/
2.50V
+
+
--
CURRENT
SENSE
AMPLIFIER
+
--
5V
+
SQ
RQ
--
CURRENT
COMPARATOR
1.8V
1 BS
M1
3 SW
M2
4 GND
FREQUENCY
FOLDBACK
COMPARATOR
-- 0.7V 1.222V + ERROR
AMPLIFIER
5 FB
6 COMP
Figure 1—Functional Block Diagram
MP9141_BD01
MP9141 Rev. 1.11
www.MonolithicPower.com
5
4/18/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
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