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PDF AP3503 Data sheet ( Hoja de datos )
| Número de pieza | AP3503 | |
| Descripción | 3A Synchronous DC-DC Buck Converter | |
| Fabricantes | BCD | |
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Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
General Description
The AP3503 is a 340kHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 3A load with high
efficiency, excellent line and load regulation. The
device integrates N-channel power MOSFET
switches with low on-resistance. Current mode
control provides fast transient response and
cycle-by-cycle current limit.
The AP3503 employs complete protection to ensure
system security. Including output Over Voltage
Protection, input Under Voltage LockOut,
programmable soft-start, Over Temperature
Protection to safeguard the circuit.
This IC is available in PSOP-8 package.
Features
• Input Voltage Range: 4.5V to 18V
• Fixed 340kHz Frequency
• High Efficiency: up to 95%
• Output Current: 3A
• Current Mode Control
• Built-in Over Current Protection
• Built-in Thermal Shutdown Function
• Built-in UVLO Function
• Built-in Over Voltage Protection
• Programmable Soft-start
Applications
• LCD TV
• Set Top Box
• Portable DVD
• Digital Photo Frame
PSOP-8
Figure 1. Package Type of AP3503
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Electrical Characteristics
TA=25ºC, VIN=VEN=12V, VOUT=3.3V, unless otherwise specified.
Parameter
Symbol
Conditions
SUPPLY VOLTAGE (IN PIN)
Input Voltage
Quiescent Current
Shutdown Supply Current
UNDER VOLTAGE LOCKOUT
VIN
IQ
ISHDN
VFB=1V,VEN=3V
VEN=0V
Input UVLO Threshold
Input UVLO Hysteresis
ENABLE (EN PIN)
VUVLO
VHYS
VIN Rising
EN Shutdown Threshold Voltage
EN Shutdown Threshold Voltage Hysteresis
(Note 2)
EN Lockout Threshold Voltage
EN Lockout Hysteresis
VOLTAGE REFERENCE (FB PIN)
Feedback Voltage
Feedback Over Voltage Threshold
Feedback Bias Current
MOSFET
VFB
VFBOV
IFB
VFB=1V
High-side Switch On-resistance(Note 3)
Low-side Switch On-resistance(Note 3)
CURRENT LIMIT
RDSONH ISW=0.2A/0.7A
RDSONL ISW=-0.2A/-0.7A
High-side Switch Leakage Current
High-side Switch Current Limit
Low-side Switch Current Limit
SWITCHING REGULATOR
ILEAKH
ILIMH
ILIML
VIN=18V,VEN=VSW=0V
From drain to Source
Oscillator Frequency
Short Circuit Oscillator Frequency
Max. Duty Cycle
Min. Duty Cycle
ERROR AMPLIFIER
fOSC1
fOSC2
DMAX
DMIN
VFB=0.85V
VFB=1V
Error Amplifier Voltage Gain (Note 2)
Error Amplifier Transconductance
COMP to Current Sense Transconductance
THERMAL SHUTDOWN
AEA
GEA
GCS
Thermal Shutdown (Note 2)
Thermal Shutdown Hysteresis (Note 2)
SOFT START (SS PIN)
TOTSD
THYS
Min
4.5
3.65
1.1
2.2
0.907
-0.1
4.3
280
Soft-start Time (Note 2)
tSS CSS=0.1µF
Soft-start Current
Note 2: Not tested, guaranteed by design.
Note 3:
RDSON=
VSW1
ISW1
- VSW2
- ISW2
.
VSS=0V
Typ
1.2
0.1
4.00
200
1.5
350
2.5
210
0.925
1.1
100
100
0.1
5.6
1.4
340
90
90
400
800
5.2
160
20
15
6
Max Unit
18 V
1.4 mA
10 µA
4.25 V
mV
2V
mV
2.7 V
mV
0.943
0.1
V
V
µA
mΩ
mΩ
10 µA
A
A
400 kHz
kHz
%
0%
V/V
µA/V
A/V
ºC
ºC
ms
µA
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
5
5 Page 
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
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11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AP3503.PDF ] | |
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