AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
AP1509
Document number: DS31016 Rev. 4 - 2
5 of 13
www.diodes.com
June 2010
© Diodes Incorporated
Electrical Characteristics
Unless otherwise specified, V
IN
= 12V for 3.3V, 5V, adjustable version and V
IN
= 18V 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)
-10
-50
nA
-100
F
OSC
Oscillator Frequency
127 150 173
KHz
110 173
F
SCP
Oscillator Frequency of
Short Circuit Protect
When current limit occurred
and V
FB
< 0.5V, T
a
= 25
o
C
10 30 50 KHz
V
SAT
Saturation Voltage
I
OUT
= 2A
No outside circuit
V
FB
= 0V force driver on
1.25
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 A
I
L
Output = 0
Output
Leakage
Current
No outside circuit
V
FB
= 12V force driver off
-200 uA
Output = -1 V
IN
= 22V -5 mA
I
Q
Quiescent Current V
FB
= 12V force driver off 5 10 mA
I
STBY
Standby Quiescent
Current
ON/OFF pin = 5V
V
IN
= 22V
70
150
uA
200
V
IL
ON/OFF Pin Logic Input
Threshold Voltage
Low (regulator 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) -0.01
uA
I
L
ON/OFF Pin Input Current V
LOGIC
= 0.5V (ON) -0.1 -1
θ
JA
Thermal Resistance SOP-8L
Junction to
case
15
o
C/W
θ
JC
Thermal Resistance
with a copper area of
approximately 3 in
2
SOP-8L
Junction to
ambient
70
o
C/W
