AP3503MP-G1 [BCDSEMI]
340kHz, 3A Synchronous DC-DC Buck Converter; 340kHz ， 3A同步DC-DC降压转换器
| 型号： | AP3503MP-G1 |
| 厂家： | 
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
| 描述： | 340kHz, 3A Synchronous DC-DC Buck Converter |
| 文件： | 总11页 (文件大小：424K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Features
General Description
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Input Voltage Range: 4.5V to 18V
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.
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
The AP3503 employs complete protection to ensure
system security. Including output Over Voltage
Protection, input Under Voltage LockOut,
Applications
programmable
Protection to safeguard the circuit.
soft-start,
Over
Temperature
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LCD TV
Set Top Box
Portable DVD
Digital Photo Frame
This IC is available in PSOP-8 package.
PSOP-8
Figure 1. Package Type of AP3503
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
1
Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Pin Configuration
MP Package
(PSOP-8)
8
1
2
3
4
7
6
5
Figure 2. Pin Configuration of AP3503 (Top View)
Pin Description
Pin Number Pin Name
Function
Bootstrap pin. A bootstrap capacitor is connected between the BS pin
and SW pin. The voltage across the bootstrap capacitor drives the
internal high-side power MOSFET
Supply power input pin. A capacitor should be connected between the
IN pin and GND pin to keep the input voltage constant
Power switch output pin. This pin is connected to the inductor and
bootstrap capacitor
1
2
BS
IN
3
4
SW
GND
Ground pin
Feedback pin. This pin is connected to an external resistor divider to
program the system output voltage. When the FB pin voltage exceeds
1.1V, the over voltage protection is triggered. When the FB pin
voltage is below 0.3V, the oscillator frequency is lowered to realize
short circuit protection
Compensation pin. This pin is the output of the transconductance
error amplifier and the input to the current comparator. It is used to
compensate the control loop. Connect a series RC network from this
pin to GND. In some cases, an additional capacitor from this pin to
GND pin is required
Control input pin. EN is a digital input that turns the regulator on or
off. Drive EN high/low to turn on/off the regulator. Pull up with
100kΩ resistor for automatic startup
Soft-start control input pin. SS controls the soft-start period. Connect
a capacitor from SS to GND to set the soft-start period. A 0.1µF
capacitor sets the soft-start period to 15ms. To disable the soft-start
feature, leave SS unconnected
5
6
FB
COMP
EN
7
8
SS
EP
Exposed pad. It should be connected to GND in PCB layout
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
2
Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Functional Block Diagram
2
IN
SHUTDOWN
COMPARATOR
1.5V
VA
INTERNAL
REGULATOR
VB
CURRENT
SENSE
AMPLIFIER
SLOP
COMP
VA
+
0.3V
OSCILLATOR
90k/340k
SCP
1
BS
M1
CLK
S
R
Q
Q
3
4
LOCK
COMPARATOR
SW
PWM
7
EN
SS
COMPARATOR
M2
2.5V
VB
1.3V
GND
6
A
8
EA
5
6
0. 925V
FB
COMP
Figure 3. Functional Block Diagram of AP3503
Ordering Information
AP3503
-
Circuit Type
G1: Green
Package
MP: PSOP-8
TR: Tape & Reel
Blank: Tube
Temperature
Package
Range
Part Number
Marking ID
Packing Type
AP3503MP-G1
3503MP-G1
3503MP-G1
Tube
PSOP-8
-40 to 85°C
AP3503MPTR-G1
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
3
Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
VIN
Value
-0.3 to 20
-0.3 to VIN
21
Unit
V
IN Pin Voltage
EN Pin Voltage
VEN
V
SW Pin Voltage
VSW
VBS
V
BS Pin Voltage
-0.3 to VSW+6
-0.3 to 6
-0.3 to 6
-0.3 to 6
60
V
FB Pin Voltage
VFB
V
COMP Pin Voltage
SS Pin Voltage
VCOMP
VSS
V
V
Thermal Resistance
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10sec)
ESD (Human Body Model)
ESD (Machine Model)
ºC/W
ºC
ºC
ºC
V
θJA
TJ
150
TSTG
TLEAD
VHBM
VMM
-65 to 150
260
2000
200
V
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
VIN
Min
4.5
Max
18
Unit
V
Input Voltage
Operating Ambient Temperature
TA
-40
85
ºC
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
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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
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
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
5
Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Typical Performance Characteristics
TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.
1.4
1.3
1.2
1.1
1.0
0.9
100
90
80
70
60
50
40
30
20
10
VOUT=3.3V, TA=25oC, L=10µH
VIN=5V
VIN=12V
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
-50
-25
0
25
50
75
100
125
150
Case Temperature (oC)
Output Current (A)
Figure 4. Efficiency vs. Output Current
Figure 5. Quiescent Current vs. Case Temperature
1.2
1.1
1.0
0.9
0.8
0.7
0.6
3.6
3.5
3.4
3.3
3.2
3.1
3.0
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
-50
-25
0
25
50
75
100
125
150
Output Current (A)
Case Temperature (oC)
Figure 6. Feedback Voltage vs. Case Temperature
Figure 7. Output Voltage vs. Output Current
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
6
Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.
200
180
160
140
120
100
80
160
140
120
100
80
60
60
40
-60
40
-60
-40
-20
0
20
40
60
80
100
120
140
-40
-20
0
20
40
60
80
100
120
140
Case Temperature (oC)
Case Temperature (oC)
Figure 8. High-side Switch On-resistance
vs. Case Temperature
Figure 9. Low-side Switch On-resistance
vs. Case Temperature
VIN_AC
200mV/div
VOUT_AC
200mV/div
VOUT_AC
20mV/div
IL
2A/div
IOUT
1A/div
VSW
10V/div
Time 200µs/div
Time 4µs/div
Figure 10. Output Ripple (IOUT=3A)
Figure 11. Load Transient (IOUT =1.5A to 3A)
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
7
Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.
VEN
VEN
2V/div
2V/div
VSS
VSS
2V/div
2V/div
VOUT
VOUT
2V/div
2V/div
IL
IL
2A/div
2A/div
Time 10ms/div
Time 200µs/div
Figure 12. Enable Turn on Characteristic
(VIN=12V, VEN=3.3V, VOUT=3.3V, IL=3A)
Figure 13. Enable Turn off Characteristic
(VIN=12V, VEN=3.3V, VOUT=3.3V, IL=3A)
VOUT
2V/div
VOUT
2V/div
IL
2A/div
IL
2A/div
Time 40µs/div
Time 40µs/div
Figure 14. Short Circuit Protection (IOUT=0A)
Figure 15. Short Circuit Recovery (IOUT=0A)
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
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Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Typical Application
Input Voltage=12V
C11
R4
100k
C12
10µF/25V
10µF/25V
1
2
3
4
8
7
6
5
BS
IN
SS
EN
C5
0.1µF
C4
10nF
C6
Output Voltage=3.3V
L 10µH
Optional
SW
GND
COMP
FB
C3
3.3nF
R3
13k
R2 10k
C22
C21
22µF/25V
22µF/25V
D1
R1
Optional
26.1k
Figure 16. Typical Application of AP3503
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
9
Data Sheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503
Mechanical Dimensions
PSOP-8
Unit: mm(inch)
May. 2012 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
10
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