AP3406_09 [BCDSEMI]
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER; 为1.1MHz ， 650毫安同步DC -DC降压转换器
| 型号： | AP3406_09 |
| 厂家： | 
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
| 描述： | 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER |
| 文件： | 总12页 (文件大小：544K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Features
General Description
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High Efficiency: up to 95%
Output Current: 650mA
Input Voltage Range: 2.5V to 5.5V
Fixed 1.1MHz Frequency
The AP3406 is a 1.1MHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 650mA load with high
efficiency, excellent line and load regulation. The
device integrates a main switch and a synchronous
switch without an external Schottky diode. It is ideal
for powering portable equipment that runs from a
single Li-ion battery.
Current Mode Control
100% Duty Cycle in Dropout
Built-in Short Circuit Protection
Built-in Thermal Shutdown Function
Built-in Current Limit Function
Shutdown Current: <1μA
A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3406. This feature greatly simplifies the
design of switch-mode power supplies.
Applications
This IC is available in TSOT-23-5 and SOT-23-5
packages.
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GPS
WiFi Card
Portable Media Player
Digital Still and Video Cameras
TSOT-23-5
SOT-23-5
Figure 1. Package Types of AP3406
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Pin Configuration
KT/K Package
TSOT-23-5/SOT-23-5
EN
GND
SW
FB
1
2
3
5
4
VIN
Figure 2. Pin Configuration of AP3406 (Top View)
Pin Description
Pin
Number
Pin
Name
Function
Control input pin. Forcing this pin above 1.5V enables the IC. Forcing this pin
below 0.6V shuts down the IC. When the IC is in shutdown mode, all functions
are disabled to decrease the supply current below 1μA
1
EN
2
3
4
5
GND
SW
Ground pin
Power switch output pin. Inductor connection to drain of the internal PFET and
NFET switches
VIN
FB
Supply input pin. Bypass to GND with a 4.7μF or greater ceramic capacitor
Feedback pin. Connect it with an external resistor divider network to program
the system output voltage
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Functional Block Diagram
EN
1
VIN
4
Shutdown
Control
Slope
Compensation
Current
Sense
Current Limit
Detector
Oscillator
3
Control
Logic
SW
Driver
0.6V
VREF with
Soft Start
Error
Amplifier
PWM
Comparator
Over
Temperature
Detector
5
FB
2
GND
Figure 3. Functional Block Diagram of AP3406
Ordering Information
AP3406
-
G1: Green
TR: Tape & Reel
ADJ: Adjustable Voltage
Circuit Type
Package
KT: TSOT-23-5
K: SOT-23-5
Part Number
Marking ID
Temperature
Packing
Type
Package
Range
Green
Green
TSOT-23-5
SOT-23-5
AP3406KT-ADJTRG1
L1B
FBC
Tape & Reel
Tape & Reel
-40 to 85°C
-40 to 85°C
AP3406K-ADJTRG1
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
VIN
Value
Unit
V
Input Voltage
-0.3 to 6
Feedback Voltage
EN Pin Voltage
SW Pin Voltage
VFB
-0.3 to VIN +0.3
-0.3 to VIN+0.3
-0.3 to VIN+0.3
V
VEN
V
VSW
V
TSOT-23-5
SOT-23-5
250
265
Thermal Resistance
ºC/W
θJA
Operating Junction Temperature
Storage Temperature
TJ
125
ºC
ºC
ºC
TSTG
TLEAD
-65 to 150
260
Lead Temperature (Soldering, 10sec)
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
2.5
Max
Unit
V
Input Voltage
5.5
Maximum Output Current
Operating Ambient Temperature
IOUT (MAX)
TA
650
-40
mA
ºC
85
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Electrical Characteristics
VIN =VEN=3.6V, TA=25℃, unless otherwise specified. Specifications with boldface type apply over full
operating temperature range from -40 to 85ºC.
Parameters
Symbol
ICC
Conditions
Min
Typ
400
Max
600
1
Unit
μA
Supply Current
VFB=0.55V
Shutdown Supply Current
ISHDN
VEN=0V, VIN=5.5V
Rising edge
0.01
μA
Under Voltage Lockout
Threshold
VUVLO
2.27
V
Under Voltage Lockout
Hysteresis
VHUVLO
IFB
200
0.5
mV
nA
V
Feedback Bias Current
VFB=0.65V
IOUT=100mA
VIN=2.5V,
-50
50
0.588/
0.612/
Feedback Voltage
VFB
0.600
0.582
0.618
650
650
650
V
OUT=0.9V
VIN=3.6V,
OUT=1.2V
VIN=4.6V,
OUT=3.3V
Maximum Output Current
mA
IOUT (MAX)
V
V
Switch Current Limit
Oscillator Frequency
ILIM
fOSC
VENL
VENH
IH
VFB=0.55V
0.8
0.8
1.15
1.1
A
1.4
0.6
MHz
EN Pin Threshold
V
1.5
-0.1
-0.1
VEN=3.6V
VEN=0V
0.1
0.1
μA
μA
EN Pin Input Leakage
Current
IL
Internal
PFET
On
RDSONP
ISW=100mA
ISW=-100mA
0.44
Ω
Resistance
Internal
NFET
On
RDSONN
DMAX
TSS
0.29
100
220
Ω
%
μs
Resistance
Maximum Duty Cycle
VFB=0.55V
VEN=0V to VIN
Soft-start Time
I
OUT＝50mA
Thermal Shutdown
Threshold
TOTSD
THYS
160
30
ºC
ºC
Thermal Shutdown
Hysteresis
70
70
SOT-23-5
Thermal Resistance
(Junction to Case)
ºC/W
θJC
TSOT-23-5
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Typical Performance Characteristics
L=10μH, COUT=10μF, TA=25oC, unless otherwise noted.
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
VIN=3.6V
VOUT=1.8V
IOUT=0A
VIN=3.6V
VFB=0.55V
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
-60
-40
-20
0
20
40
60
80
100
Temperature (oC)
Input Voltage (V)
Figure 4. Frequency vs. Input Voltage
Figure 5. Supply Current vs. Temperature
1.4
1.3
1.2
1.1
1.0
0.9
0.8
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
1.45
VIN=3.6V
VIN=3.6V
VOUT=1.8V
VFB=0.55V
0
200
400
600
800
1000
1200
-60
-40
-20
0
20
40
60
80
100
Temperature (oC)
Output Current (mA)
Figure 6. Current Limit vs. Temperature
Figure 7. Output Voltage vs. Output Current
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Typical Performance Characteristics (Continued)
VSW
VSW
2V/div
2V/div
VOUT
VOUT
20mV/div
20mV/div
400ns/div
400ns/div
Figure 8. Light Load Operation
(VIN=3.6V, VOUT=1.8V, IOUT=0mA)
Figure 9. Heavy Load Operation
(VIN=3.6V, VOUT=1.8V, IOUT=600mA)
IIN
500mA/div
IOUT
500mA/div
VOUT
1V/div
VOUT
100mV/div
VEN
5V/div
200μs/div
200μs/div
Figure 10. Load Transient
Figure 11. Start up from Shutdown
(VIN=3.6V, VOUT=1.8V, IOUT=0mA to 500mA)
(VIN=3.6V, VOUT=1.8V, RLOAD=4Ω)
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Typical Performance Characteristics (Continued)
VOUT
1V/div
VOUT
1V/div
VSW
2V/div
VSW
2V/div
IL
500mA/div
IL
500mA/div
4μs/div
80μs/div
Figure 12. Short Circuit Protection
(VIN=3.6V, VOUT=1.8V, no load)
Figure 13. Short Circuit Recovery
(VIN=3.6V, VOUT=1.8V, no load)
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
L=2.2μH
L=4.7μH
L=10μH
L=2.2μH
L=10μH
VIN=3.6V
VIN=4.2V
VOUT=1.8V
VOUT=3.3V
100
1000
10
10
100
1000
Output Current (mA)
Output Current (mA)
Figure 14. Efficiency vs. Output Current
Figure 15. Efficiency vs. Output Current
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Typical Performance Characteristics (Continued)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
VIN=3.6V
VOUT=1.8V
-1.5
-2.0
-60
-40
-20
0
20
40
60
80
100
Temperature (oC)
Figure 16. Normalized Feedback Voltage vs. Temperature
Typical Application
Figure 17. Typical Application of AP3406
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Mechanical Dimensions
SOT-23-5
Unit: mm(inch)
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406
Mechanical Dimensions (Continued)
TSOT-23-5
Unit: mm(inch)
Oct. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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