ap1538sg-u Diodes, Inc., ap1538sg-u Datasheet - Page 4

• Manufacturer Part Number: ap1538sg-u
• Description: 18v 3a 300khz Buck Converter
• Manufacturer: Diodes, Inc.

³
Electrical Characteristics
(V
Notes:
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AP1538 Rev. 2
Symbol
R
¨V
¨V
/ V
I
T
EFFI
I
f
IN
/ V
OCSET
T
f
V
SHDN
DS(ON)
OSC1

V
V
I
I
SHDN
OSC
I
SH
HYS
FB
SL
= 12V, T
FB
JC
OUT
OUT
OUT
IH
IL
IN
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.
Feedback Voltage
Feedback Bias Current
Current Consumption During
Power Off
Line Regulation
Load Regulation
Oscillation Frequency
Frequency of Current Limit or
Short Circuit Protection
EN Pin Input Voltage
EN Pin Input Leakage Current
OCSET Pin Bias Current
Internal MOSFET R
Efficiency
Thermal shutdown threshold
Thermal shutdown hysteresis
Thermal Resistance
Junction-to-Case
A
= 25°C, unl ess otherwise specified)
Parameter
DS(ON)
I
I
V
V
I
Measure waveform at SW pin
Measure waveform at SW pin
Evaluate oscillation at SW pin
Evaluate oscillation stop at SW pin
EN Pin High
EN Pin Low
--
V
V
V
I
SOP-8L (Note 5)
SOP-8L-DEP (Note 5)
OUT
OUT
OUT
OUT
EN
IN
IN
IN
IN
www.diodes.com
=5V, V
=12V, V
=12V, V
= 5V~18V
=3A
= 0V
= 0.1A
= 0.1A
= 0.1 to 3A
4 of 14
FB
FB
OUT
=0V
Conditions
=0V
= 5V
18V 3A 300KHz BUCK CONVERTER
0.784
Min
240
2.0
75
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ.
300
110
150
-10
0.8
0.1
0.2
10
50
20
90
70
92
55
24
26
1
-
-
©
AP1538
Diodes Incorporated
0.816
Max
105
400
0.5
0.5
0.8
JUNE 2008
2
-
-
-
-
-
-
-
-
-
-
-
o
Unit
KHz
KHz
C/W
m
µA
µA
µA
µA
µA
°C
°C
%
%
%
V
V
³