AP5101
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
AP5101
Document number: DS32258 Rev. 1 - 2
5 of 15
www.diodes.com
July 2010
© Diodes Incorporated
NEW PRODUCT
Electrical Characteristics (V
IN
= 12V, T
A
= +25°C, unless otherwise noted)
Note: 5. Guaranteed by design
Symbol Parameter Test Conditions Min Typ. Max Unit
V
FB
Feedback Voltage 4.75V ≤ V
IN
≤ 22V 0.790 0.810 0.830 V
I
FB
Feedback Current V
FB
= 0.8V 0.1 µA
R
DS(ON)
Switch-On Resistance (Note 5) 0.35 Ω
Switch Leakage
V
EN
= 0V, V
SW
= 0V
10 µA
Current Limit (Note 5)
2.5 A
G
CS
Current Sense Transconductance
Output Current to Comp Pin Voltage
1.3 A/V
A
VEA
Error Amplifier Voltage Gain (Note 5)
400 V/V
G
EA
Error Amplifier Transconductance
ΔIC = ±10μA
850 uA/V
f
SW
Oscillator Frequency V
FB
= 0.6V 1.1 1.4 1.7 MHz
Fold-back Frequency V
FB
= 0V 500 kHz
Maximum Duty Cycle V
FB
= 0.6V 65 %
t
ON
Minimum On-Time (Note 5) 100 ns
Under Voltage Lockout
Threshold Rising
3.8 4.0 4.2 V
Under Voltage Lockout Threshold
Hysteresis
100 mV
EN Input Low Voltage 0.4 V
EN Input High Voltage 1.2 V
EN Input Current
V
EN
= 2V
2.1 µA
V
EN
= 0V
0.1 µA
I
S
Supply Current (Shutdown)
V
EN
= 0V
0.1 1.0 µA
I
Q
Supply Current (Quiescent)
V
EN
= 2V, V
FB
= 1V
0.5 0.7 mA
Thermal Shutdown (Note 5) 150 °C
