MP1583 MPS, MP1583 Datasheet - Page 3

• Manufacturer Part Number: MP1583
• Description: Step Down Converter
• Manufacturer: MPS

Pin Description
Table 1: Pin Designators
MP1583 Rev 2.0_06/30/04
Monolithic Power Systems
#
1
2
3
4
5
6
7
8
Name Description
COMP
GND
SW
EN
BS
FB
SS
IN
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.
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.
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.
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
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
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
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
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.
Connect to Pin 4.
Exposed Pad on
Backside.
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GND
SW
BS 1
IN
2
3
4
8
7
6
5
SS
EN
COMP
Step Down Converter
FB
MP1583
3A, 23V
3