User guide

Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417B
Jan. 2013 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
5
Electrical Characteristics
V
IN
=5V, T
A
=25ºC, unless otherwise specified.
Parameters Symbol Conditions Min Typ Max Unit
Input Voltage V
IN
2.5 5.5 V
Quiescent Current I
Q
V
FB
=0.65V 62 100
µA
Shutdown Supply Current I
STBY
V
EN
=GND 0.1 1
µA
Reference Voltage V
REF
0.588 0.6 0.612 V
Feedback Bias Current
I
FB_H
V
FB
=1V -0.1 0.1
µA
I
FB_L
V
FB
=0V -0.1 0.1
PMOSFET R
ON
R
DS(ON)_ P
I
SW
=200mA
0.25
Ω
NMOSFET R
ON
R
DS(ON) _N
I
SW
=-200mA
0.2
Ω
Switch Current Limit I
LIM
V
FB
=0.55V 1.5 2.0 A
EN Pin Threshold
V
H
1.5
V
V
L
0.4
UVLO Threshold V
UVLO
V
IN
Rising 2.3
V
UVLO Hysteresis V
HYS
0.2
Oscillator Frequency f
OSC
1.12 1.40 1.68 MHz
Max. Duty Cycle D
MAX
100
%
Min. Duty Cycle D
MIN
0
SW Leakage Current
I
SW_H
V
SW
=0V 0.1
µA
I
SW_L
V
SW
=5V 0.1
Soft-start Time t
SS
1 ms
Thermal Shutdown T
OTSD
160 ºC
Thermal Shutdown
Hysteresis
T
HYS
20 ºC
Input OVP Threshold V
IOVP
V
IN
Rising 6.3 V
Input OVP Hysteresis V
IOVP_HYS
0.5 V