150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
1
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
General Description
The AP3003 series of regulators are fixed frequency
PWM buck (step-down) DC/DC converter, capable of
driving a 3A load with excellent line and load regula-
tion. These regulators include internal frequency com-
pensation and a fixed frequency oscillator so that they
are easy to use. A system adopting AP3003 requires a
minimum number of external components to work.
A standard series of inductors, optimized for use with
the AP3003 series, are available from several manu-
facturers. This feature greatly simplifies the design of
switch-mode power suppl ies.
These ICs are available in TO-220-5 and TO-263-5
packages.
Features
·3.3V, 5V, 12V Fixed (±4% Tolerance) and Adjust-
able (±3% Tolerance) Output Versions
·Guaranteed 3A Output Load Current
·150kHz Fixed Frequency Internal Oscillato r
·Input Voltage Range up to 32V
·Requires only 4 external components
·High Efficiency up to 90%
·Excellent Line and Load Regulat ion
·TTL Shutdown Capability
·Low Power Standby Mode, IQ Typically 80µA
·Built-in Current Limit Protection and Thermal
Shutdown Circuit
Applications
·LCD Monitor and LCD TV
·On-Card DC-DC Converter
·DVD Recorder
·PDP
Figure 1. Package Types of AP3003
TO-220-5 TO-263-5
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
2
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Figure 2. Pin Configuration of AP3003 (Top View)
Pin Description
Pin Number Pin Name Function
1V
IN Unregulated input voltage
2 OUTPUT Switch driver output
3 GND Ground
4 FEEDBACK Feedback Pin. For fixed version, connect it to system output. For adjustable version,
connect it with an external resistor and capacitor feedback network to program the sys-
tem output voltage
5ON
/OFF The TTL logic compatible input to control the regulator on or off
Pin Configuration
T Package
(TO-220-5)
ON/OFF
FEEDBACK
GND
OUTPUT
V
IN
S Package
(TO-263-5)
ON/OFF
FEEDBACK
GND
OUTPUT
V
IN
5
4
3
2
1
5
4
3
2
1
Metal Tab GND
Metal Tab GND
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
3
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3003
ON/OFF
FEEDBACK
VIN
OUTPUT
GND
+
_
+
_
+
_
+
_
START UP
2.5V
REGULATOR
1.23V
REFERENCE
LATCH
150KHz
OSC
DRIVER
&
INV
THERMAL
SHUTDOWN
EA COMP
COMP
COMP
2.5V
Bias
Current Frequency Shift
220
mV 200
mV
1:100
R2
R1
1
2
3
4
5
R1=2.49k Ω R2=4.18kΩ
R1=2.49k Ω R2=7.57kΩ
R1=2.49k Ω R2=21.8kΩ
For 3.3V
5V
12V
ADJ
4.4Ω
R1=Open R2=0Ω
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
4
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Ordering Information
Circuit Type
Package
T: TO-220-5
ADJ: Adjustable Output
3.3: Fixed Output 3.3V
5.0: Fixed Output 5.0V
E1: Lead Free
AP3003 -
TR: Tape and Reel
Blank: Tube
S: TO-263-5
Package Temperature
Range Part Number Marking ID Packing
Type
Lead Free Green Lead Free Green
TO-220-5 -40 to 85oC
AP3003T-ADJE1 AP3003T-ADJG1 AP3003T-ADJE1 AP3003T-ADJG1 Tube
AP3003T-3.3E1 AP3003T-3.3G1 AP3003T-3.3E1 AP3003T-3.3G1 Tube
AP3003T-5.0E1 AP3003T-5.0G1 AP3003T-5.0E1 AP3003T-5.0G1 Tube
AP3003T-12E1 AP3003T-12G1 AP3003T-12E1 AP3003T-12G1 Tube
TO-263-5 -40 to 85oC
AP3003S-ADJE1 AP3003S-ADJG1 AP3003S-ADJE1 AP3003S-ADJG1 Tube
AP3003S-ADJTRE1 AP3003S-ADJTRG1 AP3003S-ADJE1 AP3003S-ADJG1 Tape & Reel
AP3003S-3.3E1 AP3003S-3.3G1 AP3003S-3.3E1 AP3003S-3.3G1 Tube
AP3003S-3.3TRE1 AP3003S-3.3TRG1 AP3003S-3.3E1 AP3003S-3.3G1 Tape & Reel
AP3003S-5.0E1 AP3003S-5.0G1 AP3003S-5.0E1 AP3003S-5.0G1 Tube
AP3003S-5.0TRE1 AP3003S-5.0TRG1 AP3003S-5.0E1 AP3003S-5.0G1 Tape & Reel
AP3003S-12E1 AP3003S-12G1 AP3003S-12E1 AP3003S-12G1 Tube
AP3003S-12TRE1 AP3003S-12TRG1 AP3003S-12E1 AP3003S-12G1 Tape & Reel
12: Fixed Output 12V
G1: Green
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green packages.
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
5
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Parameter Symbol Value Unit
Input Voltage VIN 40 V
ON/OFF Pin Voltage VON/OFF 40 V
Feedback Pin Voltage VFB 40 V
Operating Junction Temperature TJ150 oC
Thermal Resistance
(Junction to Ambient, No Heatsink)
TO-220-5 RθJA 60 oC/W
TO-263-5
Lead Temperature (Soldering, 10sec) TLEAD 260 oC
Storage Temperature Range TSTG -65 to 150 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 Operat ing Conditions" is not implied. Exposure to "Absolute Max-
imum Ratings" for extended periods may affect device reliability.
Parameter Symbol Value Unit
Maximum Input Voltage (Note 2)
3.3V
VIN
32
V
5.0V 32
12V 32
ADJ (VOUT=3.2V) 32
ADJ (VOUT=2.5V) 25
Operating Junction Temperature TJ-40 to 125 oC
Recommended Operating Conditions
Absolute Maximum Ratings (Note 1)
Note 2: For ADJ version, the recommended supply volt a ge depend s on the needed ou tput voltage.
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
6
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Electrical Characteristics
Parameter Symbol Conditions Min Typ Max Unit
Output Voltage VOUT 5.5V≤VIN≤32V,
0.2A≤ILOAD≤3A 3.168
3.135 3.3 3.432
3.465 V
Efficiency ηVIN=12V, ILOAD=3A 75 %
For 3.3V Output Voltage Version
Unless otherwise specified, TJ=25oC. The specifications with boldface type apply over Full Operating Junction
Temperature Range.
Parameter Symbol Conditions Min Typ Max Unit
Output Voltage VOUT 7V≤VIN≤32V,
0.2A≤ILOAD≤3A 4.800
4.750 55.200
5.250 V
Efficiency ηVIN=12V, ILOAD=3A 80 %
For 5V Output Voltage Version
Unless otherwise specified, TJ=25oC. The specifications with boldface type apply over Full Operating Junction
Temperature Range.
Parameter Symbol Conditions Min Typ Max Unit
Feedback Voltage VFB
4.5V≤VIN≤25V,
0.2A≤ILOAD≤3A,
VOUT programmed for 2.5V
1.193
1.18 1.23 1.267
1.28 V
Efficiency ηVIN=12V, ILOAD=3A, VOUT=2.5V 73 %
For ADJ Output Voltage Version
Unless otherwise specified, TJ=25oC. The specifications with boldface type apply over Full Operating Junction
Temperature Range.
Parameter Symbol Conditions Min Typ Max Unit
Output Voltage VOUT 15V≤VIN≤32V,
0.2A≤ILOAD≤3A 11.52
11.40 12.0 12.48
12.60 V
Efficiency ηVIN=24V, ILOAD=3A 88 %
For 12V Output Voltage Version
Unless otherwise specified, TJ=25oC. The specifications with boldface type apply over Full Operating Junction
Temperature Range.
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
7
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Parameter Symbol Conditions Min Typ Max Unit
Feedback Bias Current IFB Adjustable Version Only,
VFB=1.3V 10 50
100 nA
Oscillator Frequency f (Note 3) 127
110 150 173
173 kHz
Saturation Voltage VSAT ILOAD=3A ( No output devices,
VFB=0V) 1.2 1.5
1.6 V
Maximum Duty Cycle DMAX VFB=0V 100 %
Minimum Duty Cycle DMIN VFB=1.3V 0 %
Current Limit ICL Peak Current , No output
devices, VFB=0V 3.6
3.4 4.5 6.9
7.5 A
Output Leakage Current ISWL
Output=0V, No output devices,
VFB=1.3V, VIN=32V 50 µA
Output=-1V, No output devices,
VFB=1.3V, VIN=32V 230 mA
Quiescent Current IQVFB=1.3V 5 10 mA
Standby Quiescent Current ISTBY ON/OFF Pin=5V, VIN=18V 80 200
250 µA
ON/OFF Pin Logic Input
Threshold Voltage
VIL Regulator ON 0.6 V
VIH Regulator OFF 2.0
ON/OFF Pin Input Current IHVPIN5=2.5V (Regulator OFF) 5 15 µA
ILVPIN5=0.5V (Regulator ON) 0.02 5 µA
For All Output Voltage Versions
Unless otherwise specified , VIN=12V for 3.3V, 5V and adjustable version, VIN=24V for 12V version,
ILOAD=500mA, TJ=25oC. Specifications with boldface type apply over Full Operating Junction Temperature
Range.
Electrical Characteristics (Continued)
Note 3: The switching frequency is reduced when the second stage current limit is activated.
Note 4: The specifications with boldface are GBD (Guaranteed By Design ).
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
8
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Figure 6. Efficiency vs. Output Current Figure 7. Efficiency vs. Output Current
Typical Performance Characteristics
Figure 4.
Efficiency vs. Output Current
Figure 5. Efficiency vs. Output Current
0.00.51.01.52.02.53.03.5
60.0
62.5
65.0
67.5
70.0
72.5
75.0
77.5
80.0
82.5
85.0
87.5
90.0
efficiency (%)
Output Current (A)
ADJ Version (VOUT Regulated to 2.5V)
VIN=10V, TJ=25OC
0.00.51.01.52.02.53.03.5
60.0
62.5
65.0
67.5
70.0
72.5
75.0
77.5
80.0
82.5
85.0
87.5
90.0
Efficiency (%)
Output Current (A)
5.0V Version
VIN=12V, TJ=25OC
0.00.51.01.52.02.53.03.5
60.0
62.5
65.0
67.5
70.0
72.5
75.0
77.5
80.0
82.5
85.0
87.5
90.0
Efficiency (%)
Output Current (A)
3.3V Version
VIN=12V, TJ=25OC
0.00.51.01.52.02.53.03.5
60.0
62.5
65.0
67.5
70.0
72.5
75.0
77.5
80.0
82.5
85.0
87.5
90.0
Efficiency (%)
Output Current (A)
12V Version
VIN=24V,TJ=25oC
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
9
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Typical Performance Characteristics (Continued)
Figure 10. Load Regulation
Figure 8.
Efficiency vs. Input Voltage Figure 9. Line Regulation
0 4 8 12162024283236
60.0
62.5
65.0
67.5
70.0
72.5
75.0
77.5
80.0
82.5
85.0
87.5
90.0
92.5
IOUT=3A, TJ=25OC
3.3V Version
5.0V Version
12V Version
ADJ Version (VOUT=2.5V)
Efficiency (%)
Input Voltage (V)
Figure 11. Switch Saturation Voltage vs. Switch Current
0 4 8 12 16 20 24 28 32 36
-0.20
-0.16
-0.12
-0.08
-0.04
0.00
0.04
0.08
0.12
0.16
0.20
Output Voltage Change (%)
Input Voltage (V)
VOUT=5.0V
ILOAD=0.1A
TJ=25OC
0.00.51.01.52.02.53.03.5
4.95
4.96
4.97
4.98
4.99
5.00
5.01
5.02
5.03
5.04
5.05
Output Voltage (V)
Output Current (A)
VIN=12V, VOUT=5.0V
TJ=25OC
0.00.51.01.52.02.53.03.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
Switch Saturation Voltage (V)
Switch Current (A)
VIN=12V, TJ=25OC
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
10
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Typical Performance Characteristics (Continued)
Figure 14. Quiescent Current vs. Junction Temperature
Figure 12.
Switch Current Limit vs. Junction Te mperature Figure 13. Quiescent Current vs. Supply Voltage
Figure 15. Shutdown Quiescent Current vs. Input Voltage
-40-200 20406080100120
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Switch Current Limit (A)
Junction Temperature (OC)
VIN=12V
0 5 10 15 20 25 30 35 40
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Quiescent Current (mA)
Supply Voltage (V)
TJ=25OC
VON/OFF=0, Switch Off
-40-200 20406080100120
2.50
2.75
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Quiescent Current (mA)
Junction Temperature (oC)
VIN=12V
VON/OFF=0V, Switch OFF
0 4 8 12 16 20 24 28 32 36
0
20
40
60
80
100
120
140
160
180
Shutdown Quiescent Current (µA)
Supply Voltage (V)
TJ=25OC
VON/OFF=5V
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
11
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Typical Performance Characteristics (Continued)
Figure 18. Switching Frequency vs. Junction Temperature
Figure 16.
On/Off Threshold Voltage Figure 17. On/Off Pin Current vs. On/Off Pin Voltage
-40-200 20406080100120
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
OFF
ON
ON/OFF Voltage (V)
Junction Temperature (OC)
VIN=12V
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0
0
1
2
3
4
5
6
7
8
ON/OFF Pin Current (µA)
ON/OFF Pin Voltage (V)
VIN=32V, TJ=25OC
-40-200 20406080100120
120
124
128
132
136
140
144
148
152
156
160
Frequency (kHz)
Junction Temperature (OC)
vs. Junction Temperature
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
12
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Figure 20. Typical Application of AP3003-5.0V
Figure 19. Typical Application of AP3003-3.3V
L1: Sumida CDRH127/LDNP-220MC or Equivalent
L1: Sumida CDRH127/LD NP-22 0MC or Equivalent
Typical Application
++
L1
22µH
D1
1N5822 COUT
ON/OFFGND
VIN OUTPUT
FEEDBACK
220µF
CIN
470µF
Regulated
DC Output
3A Load
AP3003-3.3V
4
2
5
3
1
++
L1
22µH
D1
1N5822
COUT
ON/OFFGND
VIN OUTPUT
FEEDBACK
220µF
CIN
470µF
12V
Unregulated
DC Input
Regulated
DC Output
3A Load
AP3003-5.0V
4
2
53
1
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
13
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Typical Application (Continued)
Figure 20. Typical Application of AP3003-ADJ
Figure 19. Typical Application of AP3003-12V
L1: Sumida CDRH127/LDNP-220MC or Equivalent
L1: Sumida CDRH127/LD NP-22 0MC or Equivalent
++
L1
22µH
D1
1N5822 COUT
ON/OFFGND
VIN OUTPUT
FEEDBACK
220µF
CIN
470µF
24V
Unregulated
DC Input
Regulated
DC Output
3A Load
AP3003-12V
4
2
53
1
++
L1
22µH
D1
1N5822 COUT
ON/OFFGND
VIN OUTPUT
FEEDBACK
220µF
CIN
470µF
12V
Unregulated
DC Input
2.5V
Regulated
DC Output
3A Load
R1
3.6k
R2 3.69k
AP3003-ADJ
4
2
53
1
CFF
33nF
VOUT=1.23 * (R2+R1)
R1
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
14
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Mechanical Dimensions
Unit: mm(inch)
2.590(0.102)
2.890(0.114)
4.470(0.176)
4.670(0.184)
8.200(0.323)
8.600(0.339)
6.700(0.264)
6.900(0.272)
13.500(0.531)
13.900(0.547)
11.760(0.463)
12.160(0.479)
1.700(0.067)
TYP 0.310(0.012)
0.530(0.021)
2.520(0.099)
2.820(0.111)
0.710(0.028)
0.910(0.036)
9.850(0.388)
10.150(0.400) 1.170(0.046)
1.370(0.054)
φ3.790(0.149)
3.890(0.153)
TO-220-5
150kHz 3A BUCK DC-DC CONVERTER AP3003
Data Sheet
15
Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Mechanical Dimensions (Continued)
5.600 (0.220)
REF
9.880 (0.389)
10.180 (0.401)
1.560 (0.061)
1.760 (0.069)
8.200 (0.323)
8.600 (0.339)
5.080 (0.200)
5.480 (0.216)
0.710 (0.028)
0.910 (0.036)
1.700 (0.067)
TYP
6.700 (0.264)
6.900 (0.272)
15.140 (0.596)
15.540 (0.612)
1.170 (0.046)
1.370 (0.054)
4.470 (0.176)
4.670 (0.184)
0.000 (0.000)
0.150 (0.006)
2.340 (0.092)
2.740 (0.108)
0.310 (0.012)
0.530 (0.021)
TO-263-5 Unit: mm(inch)
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility fo r use of any its products for any
particular purpose, nor does BCD Semiconductor Man ufacturing Limited assume any liability arising out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
- Wafer Fab
Shanghai SIM-BCD Semiconductor Manufacturing Limited
800, Yi Shan Road, Shanghai 200233, China
Tel: +86-21-6485 1491, Fax: +86-21-5450 0008
BCD Semiconductor Manufacturing Limited
MAIN SITE
REGIONAL SALES OFFICE
Shenzhen Office
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd. Shenzhen Office
Advanced Analog Circuits (Shanghai) Corporation Shenzhen Office
Room E, 5F, Noble Center, No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China
Tel: +86-755-8826 7951
Fax: +86-755-8826 7865
Taiwan Office
BCD Semiconductor (Taiwan) Company Limited
4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,
Taiwan
Tel: +886-2-2656 2808
Fax: +886-2-2656 2806
USA Office
BCD Semiconductor Corporation
30920 Huntwood Ave. Hayward,
CA 94544, U.S.A
Tel : +1-510-324-2988
Fax: +1-510-324-2788
- IC Design Group
Advanced Analog Circuits (Shanghai) Corporation
8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China
Tel: +86-21-6495 9539, Fax: +86-21-6485 9673
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
BCD Semiconductor Manufacturing Limited
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
- Wafer Fab
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
800 Yi Shan Road, Shanghai 200233, China
Tel: +86-21-6485 1491, Fax: +86-21-5450 0008
MAIN SITE
REGIONAL SALES OFFICE
Shenzhen Office
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office
Unit A Room 1203, Skyworth Bldg., Gaoxin Ave.1.S., Nanshan District, Shenzhen,
China
Tel: +86-755-8826 7951
Fax: +86-755-8826 7865
Taiwan Office
BCD Semiconductor (Taiwan) Company Limited
4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,
Taiwan
Tel: +886-2-2656 2808
Fax: +886-2-2656 2806
USA Office
BCD Semiconductor Corp.
30920 Huntwood Ave. Hayward,
CA 94544, USA
Tel : +1-510-324-2988
Fax: +1-510-324-2788
- Headquarters
BCD Semiconductor Manufacturing Limited
No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, China
Tel: +86-21-24162266, Fax: +86-21-24162277
