AP1538 Ver la hoja de datos (PDF) - Diodes Incorporated.
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AP1538 Datasheet PDF : 13 Pages
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AP1538
18V 3A 300KHz BUCK CONVERTER
Electrical Characteristics
(VIN = 12V, TA = 25°C, unless otherwise specified)
Symbol
Parameter
Conditions
VFB
IFB
ISHDN
Feedback Voltage
Feedback Bias Current
Current Consumption During
Power Off
IOUT = 0.1A
IOUT = 0.1A
VEN = 0V
Min
0.784
-
-
Typ.
0.8
0.1
10
Max Unit
0.816 V
0.5 µA
-
µA
∆VOUT
/ VIN
Line Regulation
VIN = 5V~18V
-
1
2
%
∆VOUT
/ VOUT
Load Regulation
IOUT = 0.1 to 3A
-
0.2 0.5 %
fOSC Oscillation Frequency
Measure waveform at SW pin
240 300 400 KHz
fOSC1
Frequency of Current Limit or
Short Circuit Protection
Measure waveform at SW pin
-
50
- KHz
VIH
VIL
EN Pin Input Voltage
Evaluate oscillation at SW pin
2.0
Evaluate oscillation stop at SW pin -
-
-
-
0.8
V
ISH
ISL
EN
Pin
Input
Leakage
Current
EN
EN
Pin
Pin
High
Low
-
20
-
µA
-
-10
-
µA
IOCSET OCSET Pin Bias Current
--
75
90 105 µA
RDS(ON) Internal MOSFET RDS(ON)
VIN=5V, VFB=0V
VIN=12V, VFB=0V
-
-
110
70
-
-
mΩ
EFFI Efficiency
VIN=12V, VOUT = 5V
IOUT=3A
-
92
-
%
TSHDN Thermal shutdown threshold
-
150
-
°C
THYS Thermal shutdown hysteresis
-
55
-
°C
θJC
Thermal Resistance
Junction-to-Case
SOP-8L (Note 5)
SOP-8L-DEP (Note 5)
-
-
24
26
-
-
oC/W
Notes: 5. Test condition for SOP-8L and SOP-8L-DEP: Devices mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with
thermal vias, double sided FR-4 PCB.
AP1538 Rev. 5
DS31451
5 of 13
www.diodes.com
OCTOBER 2009
© Diodes Incorporated
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