MP1430DN-Z データシートの表示（PDF） - Monolithic Power Systems
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MP1430DN-Z Datasheet PDF : 11 Pages
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MP1430 – 3A, 28V, 385KHz STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Refer to Typical Application Schematic on Page 1
IL
1A/div.
VOUT
10mV/div.
VIN
100mV/div.
VSW
10V/div.
MP1430-TPC07
Efficiency vs
Load Current
100
95
VIN = 5V
90
85
80
VIN = 24V
75
VIN = 12V
70
65
60
55
50
0 500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
MP1430_TPC08
Efficiency vs
Load Current
100
95
VIN = 9V
90
85
VIN = 24V
80
VIN = 12V
75
70
65
60
55
50
0 500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
MP1430 _TPC09
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 10nF 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
2
IN IN with a 6V to 28V power source. Bypass IN to GND with a suitably large capacitor to eliminate
noise on the input to the IC. See Input Capacitor section.
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. (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
5
FB voltage divider from the output voltage. The feedback threshold is 1.222V. See Setting the
Output Voltage section.
Compensation Node. COMP is used to compensate the regulation control loop. Connect a series
6 COMP 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 section.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the
7
EN
regulator, drive EN low to turn it off. An Under Voltage Lockout (UVLO) function can be
implemented by the addition of a resistor divider from VIN to GND. For complete low current
shutdown its needs to be less than 0.7V. For automatic startup, leave EN unconnected.
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 10ms. To disable the
soft-start feature, leave SS unconnected.
MP1430 Rev. 1.0
11/1/2005
www.MonolithicPower.com
4
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© 2005 MPS. All Rights Reserved.
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