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7440530047 データシート(PDF) 3 Page - Monolithic Power Systems

部品番号 7440530047
部品情報  1.2A, 24V, 1.4MHz Step-Down Converter in a TSOT23-6
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メーカー  MPS [Monolithic Power Systems]
ホームページ  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

7440530047 データシート(HTML) 3 Page - Monolithic Power Systems

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MP2359 – 1.2A, 24V, 1.4MHz STEP-DOWN CONVERTER IN A TSOT23-6
MP2359 Rev. 1.1
www.MonolithicPower.com
3
6/23/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
TM
PIN FUNCTIONS
Pin #
Name Description
1
BST
Bootstrap. A capacitor is connected between SW and BS pins to form a floating supply across
the power switch driver. This capacitor is needed to drive the power switch’s gate above the
supply voltage.
2
GND
Ground. This pin is the voltage reference for the regulated output voltage. For this reason care
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.
3
FB
Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the
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.
4
EN
On/Off Control Input. Pull EN above 1.2V to turn the device on.
5
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.
6
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
VIN = 12V
VIN = 24V
VOUT = 5V
100
90
80
70
60
50
40
30
20
10
0
LOAD CURRENT (A)
100
90
80
70
60
50
40
30
20
10
0
0.01
0.1
1
10
LOAD CURRENT ( A)
Efficiency vs
Load Current
VIN = 18V
VIN = 24V
VOUT = 2.5V
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
DIE TEMPERATURE (OC)
-50 -25 0 25
75 100 125
50
150
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
DIE TEMPERATURE (OC)
-50 -25 0 25
75 100 125
50
150
0.01
0.1
1
10


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