EV0012 データシートの表示（PDF） - Monolithic Power Systems
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EV0012 Datasheet PDF : 9 Pages
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Monolithic Power Systems
Figure 2: Functional Block Diagram
MP1410
2A Step-Down
Switch-Mode Regulator
PRELIMINARY
IN 2
EN 7
Internal
Regulators
Σ
Slope
Compensation
Oscillator
40/400KHz
CLK
Shutdown
Comparator
0.7V
1uA
2.30/2.53V
CoLmopcakroautotr
Current
Sense
Amplifier
5V
SQ
RQ
Current
Comparator
1.8V
1 BS
M1
3 SW
M2
4 GND
Frequency
Foldback
Comparator
0.7V
5 FB
1.22V
Error Amplifier
gm= 630uA/Volt
6 COMP
Pin Description
BS 1
IN 2
SW 3
GND 4
8 N/C
7 EN
6 COMP
5 FB
# Name Description
1
BS High-Side Gate Drive Boost Input. BS supplies the drive for the high-side n-channel MOSFET switch.
Connect a 0.1µF or greater capacitor from SW to BS to power the high-side switch.
2
IN
Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN
with a 4.75V to 15V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise
on the input to the IC. See Input Capacitor.
3
SW Power Switching Output. SW is the switching node that supplies power to the output. Connect the
output LC filter from SW to the output load. Note that a capacitor is required from SW to BS to power
the high-side switch.
4
GND Ground.
5
FB Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a resistive
voltage divider from the output voltage. The feedback threshold is 1.22V. See Setting the Output
Voltage.
6 COMP Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC
network from COMP to GND to compensate the regulation control loop. See Compensatiionr.
7
EN Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the
regulator, drive it low to turn it off. For automatic startup, leave EN unconnected.
8
N/C No Connect
MP1410 Rev 1.0_ 05/29/02
www.monolithicpower.com
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