MBRS130 Ver la hoja de datos (PDF) - Monolithic Power Systems
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MBRS130 Datasheet PDF : 11 Pages
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TM
MP1570 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin # Name Description
1
BS
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET
switch. Connect a 0.01µF 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. Connect
3
SW 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 (Connect Exposed Pad 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 1.230V. 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
Components.
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. Pull up with 100kΩ resistor for automatic startup.
Soft-start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND
8
SS to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 20ms. To disable the
soft-start feature, leave SS unconnected.
BLOCK DIAGRAM
1.5V
+
LATCH
FB 5
+
0.3V
OVP
RAMP
OSCILLATOR
CLK
100/340KHz
SS 8
+
1.23V +
ERROR
AMPLIFIER
CURRENT
SENSE
AMPLIFIER +
SQ
RQ
+
CURRENT
COMPARATOR
2 IN
5V
1 BS
3 SW
COMP 6
EN 7
2.5V +
+
EN OK
LOCKOUT
COMPARATOR
1.2V
1.5V
SHUTDOWN
COMPARATOR
Figure 1—Functional Block Diagram
4
OVP
IN < 4.05V
GND
IN
INTERNAL
REGULATORS
MP1570_BD01
MP1570 Rev. 1.5
www.MonolithicPower.com
4
1/31/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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