Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503F
Electrical Characteristics
TA=25ºC, VIN=VEN=12V, VOUT=3.3V, unless otherwise specified.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
SUPPLY VOLTAGE (IN PIN)
Input Voltage
VIN
IQ
4.5
18
1.4
10
V
Quiescent Current
VFB=1V,VEN=3V
VEN=0V
1.2
0.1
mA
μA
Shutdown Supply Current
ISHDN
UNDER VOLTAGE LOCKOUT
Input UVLO Threshold
VUVLO
VHYS
VIN Rising
3.65
4.00
200
4.25
V
Input UVLO Hysteresis
mV
ENABLE (EN PIN)
EN Shutdown Threshold Voltage
EN Shutdown Threshold Voltage Hysteresis
(Note 2)
EN Lockout Threshold Voltage
EN Lockout Hysteresis
1.1
2.2
1.5
2
V
350
mV
2.5
2.7
V
210
mV
VOLTAGE REFERENCE (FB PIN)
Feedback Voltage
VFB
VFBOV
IFB
0.907
-0.1
0.925
1.1
0.943
0.1
V
V
Feedback Over Voltage Threshold
Feedback Bias Current
VFB=1V
μA
MOSFET
High-side Switch On-resistance(Note 3)
100
100
RDSONH ISW=0.2A/0.7A
RDSONL ISW=-0.2A/-0.7A
mΩ
mΩ
Low-side Switch On-resistance(Note 3)
CURRENT LIMIT
High-side Switch Leakage Current
High-side Switch Current Limit
Low-side Switch Current Limit
ILEAKH
ILIMH
ILIML
VIN=18V,VEN=VSW=0V
0.1
5.6
1.4
10
μA
A
4.3
From drain to Source
A
SWITCHING REGULATOR
Oscillator Frequency
fOSC1
fOSC2
DMAX
DMIN
280
340
90
400
0
kHz
kHz
%
Short Circuit Oscillator Frequency
Max. Duty Cycle
VFB=0.85V
VFB=1V
90
Min. Duty Cycle
%
ERROR AMPLIFIER
Error Amplifier Voltage Gain (Note 2)
Error Amplifier Transconductance
COMP to Current Sense Transconductance
AEA
GEA
GCS
400
800
5.2
V/V
μA/V
A/V
THERMAL SHUTDOWN
Thermal Shutdown (Note 2)
TOTSD
THYS
160
20
ºC
ºC
Thermal Shutdown Hysteresis (Note 2)
SOFT START (SS PIN)
Soft-start Time (Note 2)
tSS
15
6
ms
CSS=0.1μF
Soft-start Current
VSS=0V
μA
Note 2: Not tested, guaranteed by design.
V
SW1 - V
SW2
Note 3: RDSON
=
.
ISW1 - ISW2
Oct. 2012 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
5
DIODES [ DIODES INCORPORATED ]
