MP2359DT-LF-Z データシートの表示（PDF） - Monolithic Power Systems
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MP2359DT-LF-Z Datasheet PDF : 9 Pages
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TM
MP2359 – 1.2A, 24V, 1.4MHz STEP-DOWN CONVERTER IN A TSOT23-6
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
Name Description
Bootstrap. A capacitor is connected between SW and BS pins to form a floating supply across
BST the power switch driver. This capacitor is needed to drive the power switch’s gate above the
supply voltage.
Ground. This pin is the voltage reference for the regulated output voltage. For this reason care
GND must be taken in its layout. This node should be placed outside of the D1 to C1 ground path to
prevent switching current spikes from inducing voltage noise into the part.
Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the
FB
output voltage. To prevent current limit run away during a short circuit fault condition, the
frequency foldback comparator lowers the oscillator frequency when the FB voltage is below
250mV.
EN On/Off Control Input. Pull EN above 1.2V to turn the device on.
IN
Supply Voltage. The MP2359 operates from a +4.5V to +24V unregulated input. C1 is needed
to prevent large voltage spikes from appearing at the input.
SW Switch Output.
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, L = 4.7µH, C1 = 10µF, C2 = 22µF, TA = +25ºC, unless otherwise noted.
Efficiency vs
Load Current
100
90
VIN = 18V
80
70
60
VIN = 24V
50
40
30
20
10
0
0.01
VOUT = 2.5V
0.1
1
10
LOAD CURRENT ( A)
Efficiency vs
Load Current
100
VIN = 12V
90
80
70
VIN = 24V
60
50
40
30
20
10
0
0.01
0.1
VOUT = 5V
1
10
LOAD CURRENT (A)
Feedback Voltage vs
Die Temperature
0.820
0.818
0.816
0.814
0.812
0.810
0.808
0.806
0.804
0.802
0.800
-50 -25 0 25 50 75 100 125 150
DIE TEMPERATURE (OC)
Switching Frequency vs
Die Temperature
1.50
1.48
1.46
1.44
1.42
1.40
1.38
1.36
1.34
1.32
1.30
-50 -25 0 25 50 75 100 125 150
DIE TEMPERATURE (OC)
MP2359 Rev. 1.1
www.MonolithicPower.com
3
6/23/2006
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© 2006 MPS. All Rights Reserved.
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