AP1520
PWM CONTROL 2A STEP-DOWN CONVERTER
AP1520 Rev. 5 4 of 9 JULY 2009
DS31174 www.diodes.com © Diodes Incorporated
Electrical Characteristics (VIN = 12V, T
a
= 25°C, unless otherwise specified)
Symbol Parameter Conditions Min Typ. Max Unit
V
FB
Feedback Voltage I
OUT
= 0.1A 0.784 0.8 0.816 V
I
FB
Feedback Bias Current I
OUT
= 0.1A - 0.1 0.5 µA
I
SW
Switch Current -- 2.5 - - A
I
SHDN
Current Consumption During
Power off
V
EN
= 0V - 10 - µA
∆V
OUT
/V
IN
Line Regulation V
IN
= 5V~23V - 1 2 %
∆V
OUT
/V
OUT
Load Regulation I
OUT
= 0.1 to 2A - 0.2 0.5 %
f
OSC
Oscillation Frequency Measure waveform at SW pin 240 300 360 kHz
f
OSC1
Frequency of Current Limit or
Short Circuit Protect
Measure waveform at SW pin 10 - - kHz
V
IH
EN Pin Input Voltage
Evaluate oscillation at SW pin 2.0 - -
V
V
IL
Evaluate oscillation stop at SW pin - - 0.8
I
ENH
EN Pin Input Leakage Current
-- - 20 - µA
I
ENL
-- - -10 - µA
I
OCSET
OCSET Pin Bias Current -- 75 90 105 µA
T
SS
Soft-Start Time -- 0.3 1 2 ms
T
SHDN
Thermal shutdown threshold - 150 - °C
T
HYS
Thermal shutdown hysteresis - 55 - °C
R
DSON
Internal MOSFET R
DSON
V
IN
= 5V, V
FB
= 0V - 110 150
mΩ
V
IN
= 12V, V
FB
= 0V - 70 100
EFFI Efficiency
V
IN
= 12V, V
OUT
= 5V
I
OUT
= 2A
- 92 - %
θ
JA
Thermal Resistance
Junction-to-Ambient
SOP-8L (Note 3) - 134 -
o
C/W
θ
JC
Thermal Resistance
Junction-to-Case
SOP-8L (Note 3) - 22 -
o
C/W
Notes: 3. Test condition: Device mounted on FR-4 substrate 2oz copper, minimum recommended pad layout, single side.
For better thermal performance, please arrange larger copper pad of layout for heatsink.
