MP1583 查看數據表（PDF） - Monolithic Power Systems
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MP1583 Datasheet PDF : 11 Pages
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Monolithic Power Systems
Pin Description
BS 1
IN 2
SW 3
GND 4
Exposed Pad on
Backside.
Connect to Pin 4.
MP1583
3A, 23V
Step Down Converter
8 SS
7 EN
6 COMP
5 FB
Table 1: Pin Designators
# Name Description
1
BS
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side n-channel MOSFET
switch. Connect a 4.7nF or greater capacitor from SW to BS to power the high side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switches.
2
IN Drive IN with a 4.75V to 23V power source. Bypass IN to GND with a suitably large capacitor
to eliminate noise on the input to the IC. See Input Capacitor
Power Switching Output. SW is the switching node that supplies power to the output.
3 SW 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. (Note: Connect the exposed pad on backside to Pin 4).
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
5 FB resistive voltage divider from the output voltage. The feedback threshold is 1.222V. See
Setting the Output Voltage
Compensation Node. COMP is used to compensate the regulation control loop. Connect a
6 COMP series RC network from COMP to GND to compensate the regulation control loop. In some
cases, an additional capacitor from COMP to GND is required. See Compensation
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.
Soft Start Control Input. SS controls the soft start period. Connect a capacitor from SS to
8 SS GND to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 10ms. To
disable the soft-start feature, leave SS unconnected.
MP1583 Rev 2.0_06/30/04
www.monolithicpower.com
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