BCDSEMI AP3005

Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
General Description
Features
The AP3005 is a 420kHz fixed frequency PWM buck
(step-down) DC-DC converter, capable of driving a
2A load with high efficiency, low ripple and excellent
line and load regulation. The device includes a
voltage reference, an oscillation circuit, an error
amplifier, an internal PMOS and etc.
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The PWM control circuit is able to adjust the duty
ratio linearly from 0 to 100%. The enable function,
over current protection function, short circuit
protection function and soft-start function are built
inside. When OCP or SCP happens, the operation
frequency will be reduced from 420kHz to 40kHz.
An internal compensation block is employed to
minimize external components.
2A Constant Output Current
130mΩ RDSON Internal Power MOSFET Switch
Up to 94% Efficiency
Fixed 420kHz Frequency
Wide 4.75V to 25V Input Voltage Range
Output Voltage Adjustable from 0.8V to 21V
Built in Thermal Shutdown Function
Built-in Current Limit Function
Built-in Soft-Start Function
Support Ceramic or Electrolytic Capacitors
Applications
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The AP3005 serves as an ideal power supply unit for
portable devices, especially for chip set power in
portable systems. It’s widely used for PDVD, LCD
monitor and DPF chip set powers.
Portable DVD
LCD Monitor/LCD TV
Digital Photo Frame
ADSL
Set-up Box
The AP3005 is available in SOIC-8 package.
SOIC-8
Figure 1. Package Type of AP3005
Jun. 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
Pin Configuration
M Package
(SOIC-8)
NC
1
8
NC
VIN
2
7
EN
SW
3
6
COMP
GND
4
5
FB
Figure 2. Pin Configuration of AP3005 (Top View)
Pin Description
Pin Number
Pin Name
1, 8
NC
2
VIN
3
SW
4
GND
5
FB
6
COMP
7
EN
Jun. 2009
Function
No Connection
Supply Voltage Input Pin. The AP3005 operates from a 4.75V to 25V DC
voltage. Bypass VIN to GND with a suitable large capacitor to eliminate noise
on the input
Power Switch Output Pin. SW is the switch node that supplies power to the
output
Ground Pin.
Feedback Pin. Through an external resistor divider network, FB senses the
output voltage and regulates it. To prevent current limit run away in a short
circuit fault condition, the frequency feedback comparator lowers the oscillator
frequency to 40kHz when the FB voltage is below 0.52V. The feedback
threshold voltage is 0.8V
Compensation Pin. This pin is the output of the error amplifier. Frequency
compensation is done at this pin by connecting a series RC to ground (parallel a
C if necessary)
Enable Pin. Drive EN pin high to turn on the device, drive it low to turn off.
Default of this pin is high level
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
Functional Block Diagram
EN
7
UVLO
OCP
Bias Current
VREF (0.8V)
Current Limit
EA
5
Latch
COMP
Driver
PMOS
OTP
420kHz/40kHz
Oscillator
OSP
0.52V
VIN
Soft-start
Reference Voltage Source
and Bias Current Source
FB
2
3
4
SW
GND
6
COMP
Figure 3. Functional Block Diagram of AP3005
Ordering Information
AP3005
G1: Green
Circuit Type
Blank: Tube
TR: Tape & Reel
Package
M: SOIC-8
Package
Temperature Range
SOIC-8
-40 to 125°C
Part Number
Marking ID
Packing Type
AP3005M-G1
3005M-G1
Tube
AP3005MTR-G1
3005M-G1
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Jun. 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
3
Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Input Voltage
VIN
-0.3 to 30
V
FB Pin Voltage
VFB
-0.3 to 6
V
EN Pin Voltage
VEN
-0.3 to VIN
V
VCOMP
-0.3 to 6
V
VSW
-0.3 to VIN
V
Power Dissipation
PD
Internally limited
mW
Thermal Resistance
(Junction to Ambient, No Heat Sink, Free Air)
θJA
100
ºC/W
Operating Junction Temperature
TJ
150
ºC
Storage Temperature
TSTG
-65 to 150
ºC
Lead Temperature (Soldering, 10sec)
TLEAD
260
ºC
ESD (Human Body Model)
ESD
2000
V
COMP Pin Voltage
SW Pin Voltage
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
Min
Max
Unit
Input Voltage
VIN
4.75
25
V
VOUT
0.8
21
V
TJ
-40
125
ºC
Output Voltage
Operating Junction Temperature
Jun. 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
4
Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
Electrical Characteristics
VCC=12V, VOUT=5V, TA=25℃, unless otherwise specified.
Parameters
Symbol
Input Voltage
VIN
Shutdown Quiescent Current
ISHDN
Conditions
Min
Typ
4.75
Max
Unit
25
V
VEN=0.4V
44
60
µA
VEN=2V, VFB=1.3V
1.3
2
mA
0.8
0.816
V
-0.1
-0.5
µA
Quiescent Current
IQ
Feedback Voltage
VFB
VIN=5V to 25V
Feedback Bias Current
IFB
VFB=1.3V
Switch Current Limit
ILIM
2.5
3.4
Oscillator Frequency
fOSC
336
420
Frequency of Current Limit or
Short Circuit Protection
fOSC1
0.784
VFB<0.52V
A
504
kHz
40
kHz
Error Amplifier Voltage Gain
GV
1000
V/V
Error Amplifier Transconductance
GS
700
µA/V
EN Pin Threshold
VH
1.5
V
0.7
V
-5
-10
µA
130
150
mΩ
100
%
VL
EN Pin Input Leakage Current
IEN
VEN=2.5V
VIN=12V,
VFB=0.65V
VEN=12V, IOUT=2A
VFB=0.65V,
ISW=0.1A
Internal PMOS ON Resistance
RDSON
Maximum Duty Cycle
DMAX
Thermal Shutdown
TOTSD
155
ºC
Thermal Shutdown Hysteresis
THYS
20
ºC
Jun. 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
Typical Performance Characteristics
VCC=12V, VOUT=5V, TA=25℃, unless otherwise specified.
550
100
Operation Frequency (kHz)
500
Efficiency (%)
90
80
VOUT=3.3V
70
VOUT=5.0V
450
400
350
300
250
60
0.4
0.8
1.2
1.6
2.0
-40
0
80
120
o
Figure 4. Efficiency vs. Output Current
Figure 5. Operation Frequency vs. Temperature
100
2.4
2.0
Efficiency (%)
Supply Quiescent Current (mA)
40
Temperature ( C)
Output Current (A)
1.6
1.2
o
TA=125 C
90
80
VOUT=5.0V
o
TA=75 C
0.8
IOUT=1.0A
o
IOUT=2.0A
TA=25 C
o
0.4
TA= -50 C
4
8
12
16
20
70
24
Figure 6. Supply Quiescent Current vs. Input Voltage
Jun. 2009
8
12
16
20
24
Input Voltage (V)
Input Voltage (V)
Figure 7. Efficiency vs. Input Voltage
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
Typical Performance Characteristics (Continued)
VCC=12V, VOUT=5V, TA=25℃, unless otherwise specified.
6
120
o
100
5
TA=75 C
o
TA=25 C
80
OCP Current Limit (A)
Shutdown Quiescent Current (µA)
o
TA=125 C
o
TA= -50 C
60
40
20
0
4
3
2
1
4
8
12
16
20
0
24
-40
0
80
120
Temperature ( C)
Figure 8. Shutdown Quiescent Current vs. Input Voltage
Figure 9. OCP Current Limit vs. Temperature
0.806
6
0.804
5
OCP Current Limit (A)
Feedback Voltage (V)
40
o
Input Voltage (V)
0.802
0.800
0.798
0.796
4
3
2
1
0.794
0
-40
0
40
80
120
Temperature ( C)
Figure 10. Feedback Voltage vs. Temperature
Jun. 2009
4
8
12
16
20
24
Input Voltage (V)
o
Figure 11. OCP Current Limit vs. Input Voltage
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
Typical Performance Characteristics (Continued)
VCC=12V, VOUT=5V, TA=25℃, unless otherwise specified.
5.20
44
5.15
5.10
Output Voltage (V)
OCP Frequency (kHz)
40
36
32
5.05
5.00
4.95
4.90
VIN=12V
28
o
TA=25 C
4.85
24
-40
0
40
80
4.80
0.0
120
0.5
1.0
1.5
2.0
Output Current (A)
o
Temperature ( C)
Figure 12. OCP Frequency vs. Temperature
Figure 13. Output Voltage vs. Output Current
Maximum Output Current (A)
3.5
3.0
2.5
2.0
O
TA=25 C
1.5
VOUT=2.5V
VOUT=3.3V
1.0
VOUT=5.0V
0.5
5
10
15
20
25
Input Voltage (V)
Figure 14. Maximum Output Current vs. Input Voltage
Jun. 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
8
Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
Typical Application
(VIN=12V, VOUT =5V, IOUT =2A)
Figure 15. Typical Application 1 of AP3005 Applied with Ceramic Input and Output Capacitors
Figure 16. Typical Application 2 of AP3005 Applied with Electrolytic Input and Output Capacitors
Jun. 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
Mechanical Dimensions
SOIC-8
Jun. 2009
Rev. 1. 2
Unit: mm(inch)
BCD Semiconductor Manufacturing Limited
10
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