MP2363DN-LF-Z Datasheet, PDF (3/13 Pages) MPS Industries, Inc. – 3A, 27V, 365KHz Step-Down Converter

MP2363 – 3A, 27V, 365KHz STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
7
8
Name Description
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.
IN
Drive IN with a 4.75V to 27V power source. Bypass IN to GND with a suitably large capacitor
to eliminate noise on the input to the IC. See Input Capacitor section of Application
Information.
Power Switching Output. SW is the switching node that supplies power to the output. Connect
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.
GND Ground. Connect the exposed pad on backside to Pin 4.
Feedback Input. FB senses the output voltage to regulate said voltage. Drive FB with a
FB resistive voltage divider from the output voltage. The feedback threshold is 0.92V. See Setting
the Output Voltage section of Application Information.
Compensation Node. COMP is used to compensate the regulation control loop. Connect a
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 section of
Application Information.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN higher than 2.71V
EN to turn on the regulator, lower than 0.9V 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
SS to set the soft-start period. Soft-start cap is always recommended to eliminate the start-up
inrush current and for a smooth start-up waveform.
TYPICAL PERFORMANCE CHARACTERISTICS
V_IN = 12V, V_OUT = 2.5V, L = 15µH, C1 = 10µF, C2 = 22µF, T_A = +25°C, unless otherwise noted.
Efficiency Curve vs
Load Current
V_OUT = 3.3V
95
90
V_IN=9V
85
80
75
V_IN=12V
V_IN=24V
70
65
60
55
50
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
Efficiency Curve vs
Load Current
V_OUT = 5V
100
95
V_IN=9V
90
85
80
V_IN=12V
75
V_IN=24V
70
65
60
55
50
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
Limit Current vs
Duty Cycle
7.0
6.5
6.0
5.5
5.0
4.5
4.0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
DUTY CYCLE (%)
MP2363 Rev. 1.3
www.MonolithicPower.com
3
1/25/2010
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