AP3202 [BCDSEMI]
380kHz, 2A Asynchronous DC-DC Buck Converter; 380kHz ， 2A异步DC-DC降压转换器
| 型号： | AP3202 |
| 厂家： | 
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
| 描述： | 380kHz, 2A Asynchronous DC-DC Buck Converter |
| 文件： | 总11页 (文件大小：556K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Features
General Description
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Input Voltage Range: 4.75V to 18V
Fixed 380kHz Frequency
High Efficiency: up to 93%
Output Current: 2A
The AP3202 is a 380kHz fixed frequency, current
mode, PWM buck (step-down) DC-DC converter,
capable of driving a 2A load with high efficiency,
excellent line and load regulation. The device
integrates N-channel power MOSFET switch with
low on-resistance. Current mode control provides fast
transient response and cycle-by-cycle current limit.
Current Mode Control
Built-in Over Current Protection
Built-in Thermal Shutdown Function
Built-in UVLO Function
Built-in Over Voltage Protection
Built-in Soft-start
A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3202. This feature greatly simplifies the
design of switch-mode power supplies.
Applications
This IC is available in SOIC-8 package.
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LCD TV
Set Top Box
Portable DVD
Digital Photo Frame
SOIC-8
Figure 1. Package Type of AP3202
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Pin Configuration
M Package
(SOIC-8)
Figure 2. Pin Configuration of AP3202 (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 input pin. A capacitor should be connected between the IN pin
and GND pin to keep the input voltage constant
1
2
BS
IN
Power switch output pin. This pin is connected to the inductor and
bootstrap capacitor
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
20% of the nominal regulation value of 1.222V, the over voltage
protection is triggered. When the FB pin voltage is below 0.6V, 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
5
6
FB
COMP
Control input pin. Forcing this pin above 1.5V or set this pin floating
enables the IC. Forcing this pin below 0.5V shuts down the IC. When
the IC is in shutdown mode, all functions are disabled to decrease the
supply current below 1µA
7
8
EN
NC
No Connection
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Functional Block Diagram
2
IN
Current
Internal Bias
Sense
SLOP
And Regulator
5V
Amplifier
COMP
INTERNAL
PULL
HIGH
Oscillator
1
90k/380k
BS
M1
0.22
CLK
Q
Q
S
R
3
SW
Shutdown
Comparator
PWM
Comparator
7
M2
10
EN
0.5/1.5V
1.8V
4
GND
0.6
1.222
Short
Error
Amplifier
Protection
Comparator
6
8
5
NC
FB
COMP
Figure 3. Functional Block Diagram of AP3202
Ordering Information
AP3202
-
Circuit Type
G1: Green
Package
M: SOIC-8
TR: Tape & Reel
Blank: Tube
Temperature
Package
Range
Part Number
Marking ID
Packing Type
AP3202M-G1
3202M-G1
3202M-G1
Tube
SOIC-8
-40 to 85°C
AP3202MTR-G1
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
3
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
VIN
Value
Unit
V
IN Pin Voltage
-0.3 to 20
-0.3 to VIN
20
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
105
V
FB Pin Voltage
VFB
V
COMP Pin Voltage
Thermal Resistance
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10sec)
ESD (Machine Model)
ESD (Human Body Model)
VCOMP
θJA
V
ºC/W
ºC
ºC
ºC
V
TJ
150
TSTG
TLEAD
-65 to 150
260
200
2000
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
4.75
2
Max
Unit
V
Input Voltage
18
Maximum Output Current
Operating Ambient Temperature
IOUT(Max)
TA
A
-40
85
ºC
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
4
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Electrical Characteristics
VIN=VEN=12V, VOUT=3.3V, unless otherwise specified. Specification with standard typeface are for
TA=25oC, and those in boldface type apply over the full operating temperature range (TA=-40oC to 85oC)
Parameter
Symbol
VIN
Conditions
Min
Typ
Max
18
Unit
V
Input Voltage
4.75
Quiescent Current
Shutdown Supply Current
Feedback Voltage
IQ
VFB=1.4V, VEN=2V
VEN=0V
1.0
1
1.5
mA
µA
V
ISHDN
VFB
10
1.185
1.222
1.258
Feedback Over Voltage
Threshold
VFBOV
1.48
0.6
V
Feedback SCP Voltage Threshold
Feedback Bias Current
VFBSCP
IFB
RDSONH
RDSONL
V
µA
Ω
VFB=1V
-0.1
0.1
10
0.22
10
High-side Switch On-resistance (Note 2)
Low-side Switch On-resistance (Note 2)
ISW=0.5A
ISW=0.05A
Ω
VIN=18V, VEN=0V
VSW=0V
High-side Switch Leakage Current
ILEAKH
0.1
µA
High-side Switch Current Limit
Low-side Switch Current Limit
ILIMH
ILIML
2.8
1.5
3.8
A
A
From drain to source
0.15
VENH
VENL
IEN-PH
VUVLO
VHYS
FOSC1
EN Pin Threshold
V
0.5
4.4
EN Pull-up Current
VEN=0V
1.0
3.9
0.3
380
µA
V
Input UVLO Threshold
Input UVLO Hysteresis
Oscillator Frequency
VIN Rising
3.5
V
kHz
Short Circuit Oscillator
Frequency
FOSC2
90
90
kHz
Maximum Duty Cycle
DMAX
DMIN
AEA
VFB=1.0V
VFB=1.5V
%
%
Minimum Duty Cycle
0
Error Amplifier Voltage Gain (Note 3)
Error Amplifier Transconductance
400
700
V/V
µA/V
GEA
COMP to Current Sense
Transconductance
GCS
2.4
A/V
Thermal Shutdown (Note 3)
Thermal Shutdown Hysteresis (Note 3)
Soft-start Time (Note 3)
TOTSD
THYS
tSS
160
30
ºC
ºC
µs
IOUT=0A
500
V
SW1 - VSW2
Note 2: RDSON
=
ISW1 - ISW2
Note 3: Not tested, guaranteed by design.
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Typical Performance Characteristics
TA=25oC, VIN=12V, VOUT=3.3V, unless otherwise noted.
375
350
325
300
275
250
225
200
100
90
80
70
60
50
40
30
175
20
VIN=5V
150
125
VIN=12V
10
0
-40
-20
0
20
40
60
80
100
120
140
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Case Temperature (oC)
Output Current (A)
Figure 4. Efficiency vs. Output Current
Figure 5. RDSONH vs. Case Temperature
1.30
20
18
16
14
12
10
8
1.25
1.20
1.15
1.10
1.05
1.00
6
4
-40
-60
-40
-20
0
20
40
60
80
100
120
140
-20
0
20
40
60
80
100
120
140
Case Temperature (oC)
Case Temperature (oC)
Figure 6. RDSONL vs. Case Temperature
Figure 7. Feedback Voltage vs. Case Temperature
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Typical Performance Characteristics (Continued)
TA=25oC, VIN=12V, VOUT=3.3V, unless otherwise noted.
3.50
3.45
3.40
3.35
3.30
3.25
3.20
3.15
3.10
3.05
3.00
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.0
0.5
1.0
1.5
2.0
-60
-40
-20
0
20
40
60
80
100
120
140
Output Current (A)
Case Temperature (oC)
Figure 8. Quiescent Current vs.
Case Temperature
Figure 9. Output Voltage vs.
Output Current
VEN
2V/div
VEN
2V/div
VOUT
1V/div
VOUT
1V/div
IL
1A/div
IL
1A/div
VSW
VSW
10V/div
10V/div
Time (10ms/div)
Time (10ms/div)
Figure 10. Enable Turn on Characteristic
(IOUT=2A, CC Mode)
Figure 11. Enable Turn off Characteristic
(IOUT=2A, CC Mode)
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Typical Performance Characteristics (Continued)
TA=25oC, VIN=12V, VOUT=3.3V, unless otherwise noted.
VOUT
2V/div
VOUT
2V/div
IL
1A/div
IL
1A/div
VEN
2V/div
VEN
2V/div
VSW
5V/div
VSW
5V/div
Time (800µs/div)
Time (400µs/div)
Figure 12. Enable Turn on Characteristic
(IOUT=2A, Resistance Load)
Figure 13. Enable Turn off Characteristic
(IOU T=2A, Resistance Load)
VOUT
VOUT
2V/div
2V/div
IL
IL
1A/div
1A/div
VSW
5V/div
VSW
5V/div
Time (100µs/div)
Time (100µs/div)
Figure 14. Short Circuit Protection
(IOUT=2A)
Figure 15. Short Circuit Recovery
(IOUT=2A)
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Typical Application
Figure 16. Typical Application of AP3202
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Mechanical Dimensions
SOIC-8
Unit: mm(inch)
4.700(0.185)
0.320(0.013)
1.350(0.053)
1.750(0.069)
5.100(0.201)
0.675(0.027)
0.725(0.029)
D
5.800(0.228)
6.200(0.244)
1.270(0.050)
TYP
D
20:1
0.800(0.031)
0.100(0.004)
0.300(0.012)
0.200(0.008)
0°
8°
1.000(0.039)
3.800(0.150)
4.000(0.157)
0.190(0.007)
0.250(0.010)
1°
5°
0.330(0.013)
0.510(0.020)
0.900(0.035)
06)
.0
0(0
.15
R0
0.450(0.017)
0.800(0.031)
Note: Eject hole, oriented hole and mold mark is optional.
Mar. 2011 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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BCD Semiconductor Manufacturing Limited
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