Ap5101 – Diodes AP5101 User Manual
Page 5
AP5101
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
AP5101
Document number: DS32258 Rev. 1 - 2
5 of 15
July 2010
© Diodes Incorporated
NEW PROD
UC
T
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
Δ
IC = ±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