AP3408DNTR-G1 [BCDSEMI]
2A, 4MHz High Efficiency Synchronous Buck Converter; 2A ， 4MHz的高效率同步降压转换器
| 型号： | AP3408DNTR-G1 |
| 厂家： | 
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
| 描述： | 2A, 4MHz High Efficiency Synchronous Buck Converter |
| 文件： | 总12页 (文件大小：385K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter AP3408
Features
General Description
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Input Voltage Range: 2.6 to 5.5V
Adjustable Output from 0.8 to 5V
0.8V Reference Voltage with ± 2% Precision
Output Current: 2A
The AP3408 is a current mode, PWM synchronous
buck DC/DC converter, capable of driving a 2A load
with high efficiency, excellent line and load
regulation. It operates in continuous PWM mode.
High Efficiency up to 95%
Low RDSON Internal Switches
Programmable Frequency: 300kHz to 4MHz
Current Mode Control
Forced Continuous-mode Operation
100% Duty Cycle
Synchronizable Switching Frequency
Power Good Output Voltage Monitoring
Built-in Soft-start
Built-in Short Circuit Protection
Built-in Thermal Shutdown Protection
Built-in Current Limit Function
The AP3408 integrates synchronous P-channel and
N-channel power MOSFET switches with low
on-resistance. It is ideal for portable applications
powered from a single Li-ion battery. 100% duty
cycle and low on-resistance P-channel internal power
MOSFET can maximize the battery life.
The switching frequency of AP3408 can be
programmable from 300kHz to 4MHz, which allows
small-sized components, such as capacitors and
inductors. A standard series of inductors from several
different manufacturers are available. This feature
greatly simplifies the design of switch-mode power
supplies.
Applications
The AP3408 is available in DFN-3×3-10 and PSOP-8
packages.
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Portable Media Player
Digital Still and Video Cameras
Notebook
DFN-3×3-10
PSOP-8
Figure 1. Package Types of AP3408
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter
AP3408
Pin Configuration
DN Package
MP Package
(PSOP-8)
(DFN-3×3-10)
Pin 1 Dot
byM arking
COMP
FB
SHDN/RT
GND
8
1
2
3
4
10
9
1
2
3
4
5
COMP
FB
SHDN/RT
7
6
5
SYNC
GND
SW
Exposed Pad
Connected to
PGND
Exposed Pad
Connected to
PGND
8
PGOOD
VDD
SW
VDD
7
PGND
PVDD
6
PVDD
PGND
Figure 2. Pin Configuration of AP3408 (Top View)
Pin Description
Pin Number
Pin Name
Description
DFN-3×3-10
PSOP-8
Oscillator resistor input. Connect a resistor to GND from
SHDN/RT this pin to set the switching frequency. Forcing this pin to
DD to shutdown the device
1
1
V
External clock synchronization input. The oscillation
frequency can be synchronized to an external oscillation
applied to this pin. When tied to VDD, the internal
oscillator is selected
Signal ground. All small-signal ground, such as the
compensation components and the exposed pad should be
connected to this pin, which in turn connects to PGND at
one point
2
3
SYNC
GND
2
Internal power switch output. Connect this pin with one
terminal of the inductor
Power ground. Connect this pin as close as possible to CIN
and COUT
Power input supply. Decouple this pin to PGND with a
capacitor
Signal input supply. Decouple this pin to GND with a
capacitor. Normally VDD is equal to VPVDD
4
5
6
7
3
4
5
6
SW
PGND
PVDD
VDD
Power Good Indicator. Open-drain logic output that is
pulled to ground when the output voltage is not within ±
12.5% of regulation point
Feedback voltage. This pin is the inverting input of internal
error amplifier. It senses the converter output voltage
through an external resistor divider. The internal reference
voltage is 0.8V, which determines the output voltage
through the resistor divider
8
9
PGOOD
FB
7
8
Compensation input. This pin is the output of internal error
amplifier. Connect external compensation elements to this
pin to stabilize the control loop
10
COMP
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter
AP3408
Functional Block Diagram
SHDN/RT
1(1)
6(5)
PVDD
2
CS
SD
SYNC
SUM
Oscillator
10(8)
COMP
0.8V
9(7)
EA
FB
Clamp
4(3)
PWM
OCP
SW
Control
Logic
SS
0.4V
0.7V
0.9V
5(4)
3(2)
PGND
GND
DC
8
VREF
PGOOD
UVLO
OTP
7(6)
VDD
A (B)
A for DFN-3X3-10
B for PSOP-8
Figure 3. Functional Block Diagram of AP3408
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter
AP3408
Ordering Information
AP3408
-
G1: Green
Circuit Type
TR: Tape & Reel
Blank: Tube
Package
DN: DFN-3×3-10
MP: PSOP-8
Part Number
Marking ID
Temperature
Packing
Type
Package
Range
Green
AP3408DNTR-G1
AP3408MP-G1
Green
DFN-3×3-10
BFA
Tape & Reel
Tube
-40 to 125°C
3408MP-G1
3408MP-G1
PSOP-8
AP3408MPTR-G1
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
VDD
Value
-0.3 to 6
Unit
V
VDD Pin Voltage
PVDD Pin Voltage
FB Pin Voltage
VPVDD
VFB
-0.3 to 6
V
-0.3 to 6
V
COMP Pin Voltage
SW Pin Voltage
SHDN/RT Pin Voltage
VCOMP
VSW
-0.3 to 6
V
-0.3 to VIN+0.3
-0.3 to 6
V
VSHDN/RT
V
DFN-3×3-10
PSOP-8
110
75
Thermal Resistance
ºC/W
θJA
Operating Junction Temperature
Storage Temperature
TJ
150
-65 to 150
260
ºC
ºC
ºC
V
TSTG
TLEAD
Lead Temperature (Soldering, 10 sec)
ESD (Machine Model)
200
ESD (Human Body Model)
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.
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter
Recommended Operating Conditions
AP3408
Parameter
Symbol
VIN
Min
2.6
2
Max
Unit
V
Input Voltage
5.5
Maximum Output Current
Operating Junction Temperature
IOUT (MAX)
TJ
A
-40
125
ºC
Electrical Characteristics
VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified.
Parameters
Symbol
Conditions
Min
Typ
Max
Unit
INPUT SECTION
Input Voltage Range
Supply Current
VDD
IQ
2.6
5.5
1
V
VFB=0.75V,
No Switching
Shutdown,
VIN=5.5V
460
μA
Shutdown Supply Current
ISHDN
VUVLO
VHUVLO
μA
V
Under Voltage Threshold
Lockout
Under Voltage Hysteresis
Lockout
VDD Rising
2.2
300
mV
FEEDBACK SECTION
Feedback Voltage
VFB
IFB
RT
0.784
0.8
0.1
0.2
0.816
0.4
V
μA
Ω
FB Pin Bias Current
Current Sense Transresistance
VSHDN/RT=VIN
=5.5V
Switching Leakage Current
Error Gain Amplifier Voltage
1
μA
GV
GS
800
800
μA
/V
Error
1
Amplifier Trans-conductance
1
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter AP3408
Electrical Characteristics (Continued)
VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified.
Parameters
Symbol
Conditions
Min
Typ
Max
Unit
OSCILLATOR SECTION
RT Pin Voltage
VRT
fOSC
0.8
1
V
0.8
0.3
100
1.2
4
MHz
MHz
%
ROSC=330kΩ
ADJ Frequency
VFB=0.75V
Switching Frequency
Maximum Duty Cycle
DMAX
POWER SWITCH SECTION
Switch Current Limit
ILIMIT
VFB=0.75V
ISW=500mA
2.2
3.8
A
Internal
P-FET
On
On
RPDSON
0.11
0.16
0.17
Ω
Resistance
Internal
N-FET
RNDSON
ISW=-500mA
0.11
Ω
Resistance
SHDN/RT SECTION
Shutdown Threshold
PGOOD SECTION
PGOOD Voltage Range
VDD-0.7
VDD-0.4
V
±12.5
±15
%
PGOOD Pull Down
Resistance
120
Ω
TOTAL DEVICE
VDD=2.6 to 5.5V
VOUT=2.5V
Output Current
IOUT
2
A
Output
Regulation
Voltage
Line
VDD=2.7 to 5.5V
IOUT=100mA
LNR
0.4
%/V
Output Voltage Load
Regulation
LOD
tSS
IOUT=0.01 to 2A
±0.2
1.5
%
ms
ºC
Soft-start Time
IOUT＝10mA
Thermal
Temperature
Thermal
Shutdown
Shutdown
TOTSD
160
THYS
20
ºC
Temperature Hysteresis
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter
AP3408
Typical Performance Characteristics
VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified.
700
600
600
500
500
400
300
200
100
400
300
200
100
VIN=3.3V
V
FB=0.75V
VFB=0.75V
-60
-30
0
30
60
90
120
150
Ambient Temperature (oC)
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Figure 4. Supply Current vs. Input Voltage
Figure 5. Supply Current vs. Ambient Temperature
100
140
120
100
90
80
70
60
50
40
30
80
VOUT=2.5V
VIN=3.3V
VIN=3.3V
VFB=0.75V
60
VIN=5.0V
-60
-30
0
30
60
90
120
150
Ambient Temperature (oC)
0
500
1000
1500
2000
2500
Output Current (mA)
Figure 6. Efficiency vs. Output Current
Figure 7. PMOS ON Resistance vs.
Ambient Temperature
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter
AP3408
Typical Performance Characteristics (Continued)
VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified.
1.2
140
1.1
120
1.0
100
0.9
80
ROSC=330k
VIN=3.3V
0.8
VIN=3.3V
60
VFB=0.85V
VOUT=2.5V
0.7
-60
-30
0
30
60
90
120
150
-60
-30
0
30
60
90
120
150
Ambient Temperature (OC)
Ambient Temperature (oC)
Figure 8. NMOS ON Resistance vs.
Ambient Temperature
Figure 9. Frequency vs. Ambient Temperature
0.9
0.8
0.7
0.6
0.5
5.0
4.5
4.0
3.5
3.0
2.5
VIN=3.3V
VIN=3.3V
VOUT=2.5V
-60
-30
0
30
60
90
120
150
-40
0
40
80
120
160
Ambient Temperature (OC)
Temperature (OC)
Figure 10. VFB vs. Ambient Temperature
Figure 11. Current Limit vs. Ambient Temperature
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter AP3408
Typical Application
Figure 12. Typical Application of AP3408
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter
AP3408
Mechanical Dimensions
DFN-3×3-10
Unit: mm(inch)
0.300(0.012)
0.500(0.020)
1.600(0.063)
1.800(0.071)
0.500(0.020)
TYP
2.900(0.114)
3.100(0.122)
N6
`
N10
2.300(0.090)
2.500(0.098)
2.900(0.114)
3.100(0.122)
PIN #1
IDENTIFICATION
Pin 1 Dot
by Marking
N5
N1
0.200(0.008)
0.700(0.028)
0.000(0.000)
0.800(0.031)
0.050(0.002)
0.300(0.012)
0.153(0.006)
0.253(0.010)
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter
AP3408
Mechanical Dimensions (Continued)
PSOP-8
Unit: mm(inch)
Jul. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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BCD Semiconductor Manufacturing Limited
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