AP1501 150Khz, Buck DC/DC Converter Features Output voltage:
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This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Features
Output voltage: 3.3V, adjustable output version Adjustable version output voltage range, 1.23V 37V+4% 150Khz +15% fixed switching frequency Voltage mode non-synchronous control Thermal-shutdown current-limit protection ON/OFF shutdown control input Operating voltage Output load current: TO220-5L TO220-5L(R) TO263-5L packages power standby mode Built-in switching transistor chip
General Description
AP1501 series monolithic that design step-down DC/DC converter, ability driving load without additional transistor component. reducing number external component, board space saved easily. external shutdown function controlled logic level then come into standby mode. internal compensation makes feedback control have good line load regulation without external design. Regarding protected function, thermal shutdown prevent over temperature operating from damage, current limit against over current operating output switch. AP1501 series operates switching frequency 150KHz thus allowing smaller sized filter components than what would needed with lower frequency switching regulators. Other features include guaranteed tolerance output voltage under specified input voltage output load conditions, +15% oscillator frequency. output version included fixed 3.3V, 12V, adjustable type. packages available standard 5-lead TO-220 package 5-lead TO-263.
Applications
Simple High-efficiency step-down regulator On-card switching regulators Positive negative converter
Assignments
View Output
Descriptions
Name Output Description Operating voltage input Switching output Ground Output voltage feedback control ON/OFF shutdown
Metal
TO263-5L View Output TO220-5L
This datasheet contains product information. Anachip Corp. reserves rights modify product specification without notice. liability assumed result this product. rights under patent accompany sale product.
Rev.1.2 Aug. 2005 1/12
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Ordering Information
AP1501 Output version Blank Adjustable 3.3V 5.0V Package Lead Free Packing Blank Tube Taping
Blank Normal TO220-5L T5R: TO220-5L(R) Lead Free Package TO263-5L
Block Diagram
200mV Current Source bias 1.235V Reference 2.5V Regulator Start 220mV
Comp
Comp
Comp
Anachip Corp. www.anachip.com.tw 2/12
Frequecy compensation
Pre-driver
150kHz OSC.
Thermal Shutdown
Switch
Output
Rev.1.2 Aug. 2005
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Absolute Maximum Ratings
Symbol VOUT Parameter Supply Voltage ON/OFF input Voltage Feedback Voltage Output Voltage Ground Power Dissipation Storage Temperature Operating Temperature Operating Voltage Rating -0.3 -0.3 Internally limited +150 +125 +4.5 Unit
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN=12V 3.3V, adjustable version VIN=24V version. ILOAD 0.5A
Symbol FOSC VSAT ISTBY
Parameter Feedback Bias Current Oscillator Frequency Saturation Voltage Max. Duty Cycle(ON) Min. Duty cycle(OFF) Current Limit Output Leakage Output Current Quiescent Current Standby Quiescent Current Output ON/OFF Logic Input Threshold Voltage ON/OFF Logic Input Current ON/OFF Input Current Thermal Resistance Thermal Resistance with Copper area Approximately
Conditions VFB=1.3V (Adjustable version only)
Min.
Typ.
IOUT=3A outside circuit VFB=0V force driver VFB=0V force driver VFB=12V force driver peak current outside circuit VFB=0V force driver outside circuit VFB=12V force driver VIN=40V VFB=12V force driver ON/OFF pin=5V VIN=40V (regulator High (regulator OFF) VLOGIC=2.5V (OFF) VLOGIC=0.5V (ON) TO220-5L TO263-5L TO220-5L TO263-5L Junction Case Junction Ambient
Max.
Unit
0.02
Anachip Corp. www.anachip.com.tw 3/12
Rev.1.2 Aug. 2005
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Electrical Characteristics (Continued)
Symbol
Parameter Output Feedback Efficiency Output Voltage Efficiency
Conditions 4.5V 0.2A ILOAD VOUT programmed 12V, ILOAD=3A 4.75V 0.2A ILOAD 12V, ILOAD=3A
Typ. 1.23
Limit 1.193/1.18 1.267/1.28
Unit VMIN VMAX
AP1501-ADJ
VOUT
AP1501-3.3V
3.168/3.135 3.432/3.465
VMIN VMAX
AP1501-5V
VOUT
VOUT
Output Voltage Efficiency Output Voltage Efficiency
0.2A ILOAD 12V, ILOAD=3A 0.2A ILOAD 15V, ILOAD
4.8/4.75 5.2/5.25
VMIN VMAX VMIN VMAX
AP1501-12V
11.52/11.4 12.48/12.6
Specifications with boldface type full operating temperature range, other type
Anachip Corp. www.anachip.com.tw 4/12
Rev.1.2 Aug. 2005
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Typical Performance Characteristics
Typical Performance Characteristics Normalized Output Voltage Efficiency
=20V, LOAD=3A Normalized TJ=25oC
5.10
EFFICIENCY
OUTPUT VOLTAGE
5.05
Load
5.00
3.3V
4.95
4.90
JUNCTION
JUNCTION TEMPERATURE(
TEMPERATURE(
Switch Saturation Voltage
1.60
SATURATION VOLTAGE
Switch Current Limit
5.50
SWITCH CURRENT LIMIT
1.40 1.20 1.00
VIN=12V, VOUT=5V
5.00
4.50
0.80 0.60
4.00
3.50
SWITCH CURRENT(A) JUNCTION TEMPERATURE(
Operating Quiescent Current
25.0
SUPPLY CURRENT (mA)
Shutdown Quiescent Current
200.0 160.0
CURRENT (uA)
20.0 15.0 10.0
Switch Switch
120.0 80.0 40.0
VON/OFF=5V
JUNCTION
TEMPERATURE(
SUPPLY VOLOTAGE
Anachip Corp. www.anachip.com.tw 5/12
Rev.1.2 Aug. 2005
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Typical Performance Characteristics (Continued)
Minimum Operating Supply Voltage
THRESHOLD VOLTAGE
ON/OFF Threshold Voltage
SUPPLY VOLTAGE
VOUT=1.23V ILOAD=120mA
JUNCTION TEMPERATURE (oC)
JUNCTION TEMPERATURE (oC)
ON/OFF Current (Sinking)
150.0
FREQUENCY (kHz)
Switch Frequency
200.0
120.0
CURRENT (uA)
VIN=40V -40oC 125oC
150.0
90.0 60.0 30.0
ON/OFF VOLTAGE
100.0
50.0
JUNCTION TEMPERATURE (oC)
Feedback Bias Current
50.0
BIAS CURRENT (nA)
40.0 30.0 20.0
Adjustable Version Only
10.0
JUNCTION TEMPERATURE(
Anachip Corp. www.anachip.com.tw 6/12
Rev.1.2 Aug. 2005
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Typical Application Circuit
Fixed Type Circuit
Input Capacitor
AP1501
Output
33uH Inductor Schottky Diode
3.3V/3A Output Load
Capacitor
Adjustable Type Circuit
Input Capacitor
AP1501
Output
47uH
Output Load
Schottky Diode
Capacitor
Vout
1.23V Delay Start Circuit
Input Capacitor
CDELAY 0.1uF
RDELAY
AP1501
Output
47uH
Output Load
Schottky Diode
Capacitor
Anachip Corp. www.anachip.com.tw 7/12
Rev.1.2 Aug. 2005
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Function Description
Functions +VIN This positive input supply switching regulator. suitable input bypass capacitor must present this minimize voltage transients supply switching currents needed regulator. Ground Circuit ground. Output Internal switch. voltage this switches between (+VIN VSAT) approximately 0.5V, with duty cycle approximately VOUT VIN. minimize coupling sensitive circuitry, board copper area connected this should kept minimum. Feedback Senses regulated output voltage complete feedback loop.
approximate there many factors that affect these temperatures. Higher ambient temperatures require more heat sinking. TO-263 surface mount package designed soldered copper printed circuit board. copper board heat sink this package other heat producing components, such catch diode inductor. board copper area that package soldered should least in2, ideally should have more square inches Additional copper area improves thermal characteristics, with copper areas greater than approximately in2, only small improvements heat dissipation realized. further thermal improvements needed, double sided, multilayer board with large copper areas and/or airflow recommended. AP1501 (TO-263 package) junction temperature rise above ambient temperature with load various input output voltages. This data taken with circuit operating buck switching regulator with components mounted board simulate junction temperature under actual operating conditions. This curve used quick check approximate junction temperature various conditions, aware that there many factors that affect junction temperature. When load currents higher than used, double sided multilayer boards with large copper areas and/or airflow might needed, especially high ambient temperatures high output voltages. best thermal performance, wide copper traces generous amounts printed circuit board copper should used board layout. (Once exception this output (switch) pin, which should have large areas copper.) Large areas copper provide best transfer heat (lower thermal resistance) surrounding air, moving lowers thermal resistance even further.
/OFF Allows switching regulator circuit shutdown using logic level signals thus dropping total input supply current approximately 150uA. Pulling this below threshold voltage approximately 1.3V turns regulator pulling this above 1.3V maximum 40V) shuts regulator down. this shutdown feature needed, /OFF wired ground left open, either case regulator will condition. Thermal Considerations AP1501 available packages, 5-pin TO-220 5-pin surface mount TO-263.
TO-220 package needs heat sink under most conditions. size heatsink depends input voltage, output voltage, load current ambient temperature. AP1501 junction temperature rises above ambient temperature load different input output voltages. data these curves taken with AP1501 (TO-220 package) operating buck switching regulator ambient temperature 25oC (still air). These temperature rise numbers
Anachip Corp. www.anachip.com.tw 8/12
Rev.1.2 Aug. 2005
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Function Description (Continued)
Package thermal resistance junction temperature rise numbers approximate, there many factors that will affect these numbers. Some these factors include board size, shape, thickness, position, location, even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single double-sided, multilayer board amount solder board. effectiveness board dissipate heat also depends size, quantity spacing other components board, well whether surrounding still moving. Furthermore, some these components such catch diode will heat board heat vary input voltage changes. inductor, depending physical size, type core material resistance, could either heat sink taking heat away from board, could heat board.
Marking Information
TO263-5L
view
TO220-5L
view
Output Type: 1501: 1501-33: 3.3V 1501-50: 5.0V 1501-12:
Logo
1501-XX
Blank: normal Lead Free Package code week: 01~52 Year: "01" 2001 "02" 2002
Output Type: 1501: 1501-33: 3.3V 1501-50: 5.0V 1501-12:
Logo
1501-XX
Blank: normal Lead Free Package code week: 01~52 Year: "01" 2001 "02" 2002
Anachip Corp. www.anachip.com.tw 9/12
Rev.1.2 Aug. 2005
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Package Information
Package Type: TO220-5L
Symbol
Dimensions Millimeters Min. Nom. Max. 4.07 4.45 4.82 0.76 0.89 1.02 0.36 0.50 0.64 14.22 14.86 15.50 9.78 10.16 10.54 1.57 1.71 1.85 6.68 6.81 6.93 1.14 1.27 1.40 5.46 6.16 6.86 2.29 2.74 3.18 13.21 13.97 14.73 3.68 3.81 3.94 2.54 2.73 2.92
Dimensions Inches Min. Nom. Max.
0.160 0.030 0.014
0.560 0.385 0.062 0.263 0.045 0.215 0.090 0.520 0.145 0.100
0.175 0.035 0.020
0.585 0.400 0.067 0.268 0.050 0.243 0.108 0.550 0.150 0.107
0.190 0.040 0.025
0.610 0.415 0.073 0.273 0.055 0.270 0.125 0.580 0.155 0.115
Anachip Corp. www.anachip.com.tw 10/12
Rev.1.2 Aug. 2005
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Package Information (Continued)
Package Type: TO263-5L
10.9
Land Pattern Recommendation (Unit:
Symbol
Dimensions Millimeters Min. Nom. Max. 4.07 4.46 4.85 0.66 0.84 1.02 0.36 0.50 0.64 1.14 1.27 1.40 8.65 9.15 9.65 9.78 10.16 10.54 1.57 1.71 1.85 14.61 15.24 15.88 2.29 2.54 2.79 2.92
Dimensions Inches Min. Nom. Max. 0.160 0.176 0.191 0.026 0.033 0.040 0.014 0.020 0.025 0.045 0.050 0.055 0.341 0.360 0.380 0.385 0.400 0.415 0.062 0.068 0.073 0.575 0.600 0.625 0.090 0.100 0.110 0.115
Anachip Corp. www.anachip.com.tw 11/12
Rev.1.2 Aug. 2005
15.7
This Anachip version datasheet replaced with Diodes Inc. datasheet AP1501
AP1501
150Khz, Buck DC/DC Converter Package Information (Continued)
Package Type: TO220-5L(R) Mechanical drawing
Symbol
Dimensions Millimeters Min. Nom. Max. 9.91 10.16 10.41 1.25 20.8 21.6 22.4 23.9 24.7 25.5
Dimensions Inches Min. Nom. Max. 0.175 0.180 0.185 0.027 0.032 0.037 0.330 0.340 0.350 0.039 0.248 0.390 0.400 0.410 0.062 0.067 0.072 0.048 0.050 0.052 0.250 0.820 0.850 0.880 0.942 0.972 1.002 0.105 0.147 0.177 0.207 0.331 0.100 0.110 0.120
Anachip Corp. www.anachip.com.tw 12/12
Rev.1.2 Aug. 2005
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