MP1484 데이터 시트보기 (PDF) - Monolithic Power Systems
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MP1484 Datasheet PDF : 11 Pages
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MP1484 – 3A, 18V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
EN Lockout Threshold Voltage
EN Lockout Hysterisis
Input Under Voltage Lockout
Threshold
VIN Rising
Input Under Voltage Lockout
Threshold Hysteresis
Soft-Start Current
Soft-Start Period
Thermal Shutdown (4)
VSS = 0V
CSS = 0.1μF
Note:
4) Guaranteed by design, not tested.
Min
Typ
Max Units
2.2
2.5
2.7
V
210
mV
3.80 4.05 4.40
V
210
mV
6
μA
15
ms
160
°C
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.
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 18V power source. 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 the exposed pad to Pin 4).
Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive
5
FB voltage divider connected to it from the output voltage. The feedback threshold is 0.925V. 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. 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; low to turn it off. Attach to IN with a 100kΩ pull up 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 15ms. To disable the
soft-start feature, leave SS unconnected.
MP1484 Rev. 0.9
www.MonolithicPower.com
3
10/23/2008
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© 2008 MPS. All Rights Reserved.
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