AP3211 [BCDSEMI]
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER; 1.4MHz的， 1.5A异步DC-DC降压转换器
| 型号： | AP3211 |
| 厂家： | 
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
| 描述： | 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER |
| 文件： | 总12页 (文件大小：453K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Features
General Description
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Input Voltage Range: 4.5V to 18V
Output Voltage Adjustable from 0.81V to 15V
Fixed 1.4MHz Frequency
High Efficiency: up to 92%
Output Current: 1.5A
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
The AP3211 is a 1.4MHz fixed frequency, current
mode, PWM buck (step-down) DC-DC converter,
capable of driving a 1.5A 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.
A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3211. This feature greatly simplifies the
design of switch-mode power supplies.
The AP3211 is available in SOT-23-6 package.
Applications
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LCD TV
DPF
Portable DVD
SOT-23-6
Figure 1. Package Type of AP3211
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
1
Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Pin Configuration
K Package
(SOT-23-6)
Pin 1 Dot by Marking
6
5
4
SW
IN
1
2
3
BS
GND
FB
EN
Figure 2. Pin Configuration of AP3211 (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 NMOS switch
1
2
BS
GND
Ground pin
Feedback pin. This pin is connected to an external resistor
divider to program the system output voltage. When VFB exceeds
20% of the nominal regulation value of 0.81V, the OVP is
triggered. When VFB＜0.25V, the oscillator frequency is lowered
to realize short circuit protection
Control input pin. Forcing this pin above 1.5V enables the IC.
Forcing this pin below 0.4V shuts down the IC. When the IC is
in shutdown mode, all functions are disabled to decrease the
supply current below 1μA
3
4
FB
EN
Supply input pin. A capacitor should be connected between the
IN pin and GND to keep the DC input voltage constant
Power switch output pin. This pin is connected to the inductor
and bootstrap capacitor
5
6
IN
SW
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3211
Ordering Information
AP3211
-
Circuit Type
G1: Green
TR: Tape & Reel
Package
K: SOT-23-6
Temperature
Range
Packing
Type
Package
Part Number
Marking ID
SOT-23-6
AP3211KTR-G1
GCI
Tape & Reel
-40 to 85°C
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
VIN
Value
-0.3 to 20
-0.3 to VIN+0.3
21
Unit
V
Input Pin Voltage
EN Pin Voltage
VEN
VSW
VBS
V
SW Pin Voltage
V
Bootstrap Pin Voltage
Feedback Pin Voltage
Thermal Resistance
Operating Junction Temperature
Storage Temperature
-0.3 to VSW+6
-0.3 to 6V
220
V
VFB
V
ºC/W
ºC
θJA
TJ
150
TSTG
-65 to 150
ºC
Lead Temperature (Soldering,
10sec)
TLEAD
260
ºC
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
Unit
V
Input Voltage
18
Maximum Output Current
Operating Ambient Temperature
IOUT (MAX)
TA
1.5
A
-40
85
ºC
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Electrical Characteristics
VIN=VEN=12V, VOUT=3.3V, TA=25ºC, unless otherwise specified.
Parameter
Symbol
VIN
Conditions
Min
Typ
Max
18
Unit
V
Input Voltage
4.5
Quiescent Current
IQ
VFB=0.9V
0.8
0.1
1.1
1.0
mA
μA
V
Shutdown Supply Current
Feedback Voltage
ISHDN
VFB
VFBOV
IFB
VEN=0V
0.785 0.810 0.835
0.972
Feedback Over Voltage Threshold
Feedback Bias Current
Switch On-resistance
V
VFB=0.85V
ISW=1A
-0.1
0.1
μA
Ω
0.35
RDSON
VIN=18V,
VEN=0V
Switch Leakage Current
Switch Current Limit
ILEAK
0.1
2.4
10
μA
1.8
1.5
A
ILIM
VENH
VENL
VUVLO
VHYS
fOSC1
fOSC2
DMAX
DMIN
tON
EN Pin Threshold
V
0.4
4.3
VIN Rising
3.3
1.1
3.8
0.2
1.4
460
90
V
V
Input UVLO Threshold
Input UVLO Hysteresis
1.7
0
MHz
kHz
%
Oscillator Frequency
Short Circuit
VFB=0.6V
VFB=0.9V
Max. Duty Cycle
Min. Duty Cycle
%
Minimum On Time
Thermal Shutdown
Thermal Shutdown Hysteresis
Soft-start Time
100
160
20
ns
TOTSD
THYS
tSS
ºC
ºC
200
μs
Note 2: RDSON , tON, TOTSD, THYS and tSS are guaranteed by design.
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Performance Characteristics
TA=25ºC, VIN=12V, VEN=5V，VOUT=3.3V, unless otherwise noted.
1.10
1.05
1.00
0.95
0.90
0.85
0.80
100
90
80
70
60
50
40
0.75
VIN=12V,VOUT=3.3V
VIN=12V,VOUT=5V
30
20
10
0
VIN=12V
VFB=0.9V
VEN=5V
0.70
0.65
0.60
-60
-40
-20
0
20
40
60
80
100 120 140 160
0.01
0.1
0.5
1
2
Temperature (oC)
Output Current (A)
Figure 4. Efficiency vs. Output Current
Figure 5. Quiescent Current vs. Temperature
3.8
3.6
3.4
3.2
3.0
2.8
0.96
0.88
0.80
0.72
0.64
0.56
0.48
0.40
2.6
VIN=12V, VOUT=3.3V
2.4
2.2
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
-60
-40
-20
0
20
40
60
80
100 120 140 160
Output Current (A)
Temperature (oC)
Figure 6. Feedback Voltage vs.Temperature
Figure 7. Output Voltage vs. Output Current
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VEN=5V，VOUT=3.3V, unless otherwise noted.
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
IOUT=1.2A
IOUT=1.5A
VOUT=3.3V
4
6
8
10
12
14
16
18
20
4
6
8
10
12
14
16
18
20
Input Voltage (V)
Input Voltage (V)
Figure 8. Output Voltage vs. Input Voltage
Figure 9. Maximum Output Current vs. Input Voltage
VOUT (AC)
20mV/div
VSW
5V/div
VOUT (AC)
100mV/div
IL
IL
1A/div
1A/div
VIN
10V/div
Time (100μs/div)
Time (400ns/div)
Figure 10. Output Ripple (IOUT=1.5A)
Figure 11.Load Transient (IOUT=1 to 1.5A)
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VEN=5V，VOUT=3.3V, unless otherwise noted.
VEN
3.4V/div
VOUT
1V/div
VEN
3.8V/div
VOUT
1V/div
VSW
5V/div
VSW
5V/div
IL
1A/div
IL
1A/div
Time (10μs/div)
Time (100μs/div)
Figure 12. Enable Turn-on Characteristic
Figure 13. Enable Turn-off Characteristic
(Resistance Load, RLOAD=2.6Ω)
(Resistance Load, RLOAD=2.6Ω)
VOUT
2V/div
VOUT
2V/div
VFB
VFB
1V/div
IL
1A/div
1V/div
IL
1A/div
VSW
VSW
10V/div
10V/div
Time (400μs/div)
Time (400μs/div)
Figure 14. Short Circuit Protection (IOUT=1.5A)
Figure 15.Short Circuit Recovery (RLOAD=2.6Ω)
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VEN=5V，VOUT=3.3V, unless otherwise noted.
VFB
500mV/div
VFB
500mV/div
VOUT
2V/div
IL
1A/div
VOUT
2V/div
IL
1A/div
VSW
10V/div
VSW
10V/div
Time (200μs/div)
Time (20μs/div)
Figure 16. Over Voltage Protection (IOUT=1.5A)
Figure 17. Over Voltage Recovery (IOUT=1.5A)
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Application
Figure 18. Typical Application Circuit of AP3211
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Mechanical Dimensions
SOT-23-6
Unit: mm(inch)
0°
8°
2.820(0.111)
3.020(0.119)
0.300(0.012)
0.200(0.008)
0.400(0.016)
0.300(0.012)
0.600(0.024)
6
5
4
Pin 1 Dot by Marking
1
2
3
0.700(0.028)REF
0.950(0.037)TYP
0.100(0.004)
0.200(0.008)
0.000(0.000)
0.150(0.006)
1.800(0.071)
2.000(0.079)
0.900(0.035)
1.300(0.051)
1.450(0.057)
MAX
Jul. 2011 Rev. 1.3
BCD Semiconductor Manufacturing Limited
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