AP3503E Datasheet, PDF (5/11 Pages) BCD Semiconductor Manufacturing Limited – 340kHz, 3A Synchronous DC-DC Buck Converter Current Mode Control

Preliminary Datasheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503E
Electrical Characteristics
T_A=25ºC, V_IN=V_EN=12V, V_OUT=3.3V, unless otherwise specified.
Parameter
Symbol
Conditions
SUPPLY VOLTAGE (IN PIN)
Input Voltage
Quiescent Current
Shutdown Supply Current
UNDER VOLTAGE LOCKOUT
Input UVLO Threshold
Input UVLO Hysteresis
ENABLE (EN PIN)
EN Shutdown Threshold Voltage
V_IN
I_Q
I_SHDN
V_FB=1V, V_EN=3V
V_EN=0V
V_UVLO
V_HYS
V_IN Rising
EN1Shutdown1Threshold1Voltage1Hystere-
sis (Note 3)
EN Lockout Threshold Voltage
EN Lockout Hysteresis
VOLTAGE REFERENCE (FB PIN)
Feedback Voltage
Feedback Over Voltage Threshold
Feedback Bias Current
MOSFET
High-side Switch On-resistance(Note 2)
Low-side Switch On-resistance(Note 2)
CURRENT LIMIT
High-side Switch Leakage Current
High-side Switch Current Limit
Low-side Switch Current Limit
SWITCHING REGULATOR
Oscillator Frequency
Short Circuit Oscillator Frequency
Max. Duty Cycle
Min. Duty Cycle
ERROR AMPLIFIER
Error Amplifier Voltage Gain (Note 3)
Error Amplifier Transconductance
COMP to Current Sense Transconductance
THERMAL SHUTDOWN
Thermal Shutdown (Note 3)
Thermal Shutdown Hysteresis (Note 3)
SOFT START (SS PIN)
Soft-start Time (Note 3)
Soft-start Current
V_FB
V_FBOV
I_FB
R_DSONH
R_DSONL
I_LEAKH
I_LIMH
I_LIML
f_OSC1
f_OSC2
D_MAX
D_MIN
A_EA
G_EA
G_CS
T_OTSD
T_HYS
t_SS
V_FB=1V
I_SW=0.2A/0.7A
I_SW=-0.2A/-0.7A
V_IN=18V, V_EN=V_SW=0V
Drain to Source
V_FB=0.85V
V_FB=1V
C4=0.1µF,I_OUT=500mA
Min
4.5
3.65
1.1
2.2
0.907
-0.1
4.3
280
Typ
1.2
0.1
4.00
200
1.5
350
2.5
210
0.925
1.1
100
100
0.1
5.6
0
340
90
90
400
800
5.2
160
20
15
5
VSW1 - VSW2
Note 2: R_DSON= _{ISW1 - ISW2}
Note 3: Not tested, guaranteed by design.
Max Unit
18
V
1.4 mA
10
µA
4.25 V
mV
2
V
mV
2.7
V
mV
0.943 V
V
0.1 µA
mΩ
mΩ
10
µA
A
mA
400 kHz
kHz
%
0
%
V/V
µA/V
A/V
ºC
ºC
ms
µA
May. 2012 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
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