AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
AP1501 Rev. 11 4 of 12 JANUARY 2009
www.diodes.com © Diodes Incorporated
Recommended Operating Conditions
Symbol Parameter
Rating
Units
V
OP
Operating Voltage 4.5 to 40 V
T
A
Operating Ambient Temperature -20 to 85
o
C
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, V
IN
= 12V for 3.3V, 5V, adjustable version and V
IN
= 24V for the 12V version. I
LOAD
= 0.5A
Specifications with boldface type are for full operating temperature range, the other type are for T
J
= 25ºC.
Symbol Parameter Conditions Min Typ. Max Unit
I
FB
Feedback Bias Current
V
FB
= 1.3V
(Adjustable version only)
40
60
nA
100
F
OSC
Oscillator Frequency
127 150 173
KHZ
110 173
V
SAT
Saturation Voltage
I
OUT
= 3A
No outside circuit
V
FB
= 0V force driver on
1.3
1.4
V
1.5
DC
Max. Duty Cycle(ON)
V
FB
= 0V force driver on 100
%
Min. Duty cycle(OFF)
V
FB
= 12V force driver off 0
I
CL
Current Limit
Peak current
no outside circuit
V
FB
= 0V force driver on
3.6 4.0
5.5
A
6.5
I
L
Output = 0
Output
Leakage
Current
No outside circuit
V
FB
= 12V force driver off (Note 3)
200
uA
Output = -1
V
IN
= 40V 2 60
mA
I
Q
Quiescent Current
V
FB
= 12V force driver of
5 10
mA
I
STBY
Standby Quiescent
Current
ON/OFF pin = 5V
V
IN
= 40V
150
250
uA
350
V
IL
ON/OFF pin Logic Input
Threshold Voltage
Low
re
ulator ON
1.3
0.6
V
V
IH
High (regulator OFF) 2.0
I
H
ON/OFF Pin Logic
Input Current
V
LOGIC
= 2.5V (OFF) 15 25
uA
I
L
ON/OFF Pin Input
Current
V
LOGIC
= 0.5V (ON) 0.02 5
θ
JA
Thermal Resistance
unction to Ambient
TO263-5L (Note 4) 37
o
C/W
TO220-5L(R) (Note 4) 31
θ
JC
Thermal Resistance
Junction to Case
TO263-5L (Note 4) 6
o
C/W
TO220-5L(R) (Note 4) 5
Notes: 3. Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Feedback pin removed from output and
connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor switch OFF.
4. Test condition: Device mounted with copper area of approximately 3 in
2
,1oz,
no air flow.
