AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Description Pin Assignments The AP1506 series are monolithic IC designed for a stepdown DC/DC converter, and own the ability of driving a 3A load without external transistor. Due to reducing the number of external components, the board space can be saved easily. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control have good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is to prevent over current operating of the output switch. If current limit function occurred and VFB is down to 0.5V below, the switching frequency will be reduced. The AP1506 series operate at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The packages are available in a standard 5-lead TO263 and TO220. ( Top View ) 5 SD 4 FB 3 Gnd 2 Output 1 VIN Metal Tab GND TO263-5L ( Top View ) 5 SD 4 FB 3 Gnd 2 Output 1 VIN TO220-5L/TO220-5L(R) Features Applications • • • • • • • • • • • • • • • • Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version Adjustable Version Output Voltage Range, 1.23V to 18V+4% 150KHz +15% Fixed Switching Frequency Voltage Mode Non-Synchronous PWM Control Thermal-Shutdown and Current-Limit Protection ON/OFF Shutdown Control Input Operating Voltage can be up to 22V Output Load Current: 3A Lead Free packages: TO263-5L and TO220-5L(R) TO263-5L and TO220-5L(R): Available in “Green” Molding Compound (No Br, Sb) Low Power standby mode Built-in Switching Transistor On Chip Lead Free Finish/RoHS Compliant (Note 1) Notes: Simple High-Efficiency Step-Down Regulator On-Card Switching Regulators Positive to Negative Converter 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. AP1506 Document number: DS31015 Rev. 7 - 2 1 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Typical Application Circuit (1) Fixed Type Circuit FB 12V DC Input L1 33uH 4 AP1506 - 33 1 VIN 2 3.3V/3A Output Load Inductor 3 5 SD C IN Capacitor Output D1* Schottky Diode GND Co Capacitor (2) Adjustable Type Circuit R1 R2 FB 12V DC Input L1 47uH 4 VIN 1 AP1506 5 SD C IN Capacitor Output 2 5V/ 3A Output Load 3 GND Vout = VFB × (1 + D1* Schottky Diode R1 Co Capacitor ) R2 VFB = 1.23V R2 = 1K ~ 3K (3) Delay Start Circuit R2 R1 FB 12V DC Input VIN CDELAY C IN Capacitor Notes: L1 47uH 4 0.1uF 2 AP1506 1 Output 5V / 3A Output Load 3 5 SD RDELAY 10K GND D1* Schottky Diode Co Capacitor 2. For up to 2A = DFLS230L (Vf = 0.42V) For up to 3A = B340LA, B340LB (Vf = 0.45V) AP1506 Document number: DS31015 Rev. 7 - 2 2 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Pin Descriptions Pin Name VIN Output GND Description Operating Voltage Input Switching Output Ground FB Output Voltage Feedback Control SD ON/OFF Shutdown Functional Block Diagram SD VIN 200mV Current Source bias 1.235V Reference 2.5V Regulator 220mV Start up + Comp - Comp + Frequecy compensation - - FB + Amp Comp + Pre-driver 3A Switch Output 150KHz OSC. AP1506 Document number: DS31015 Rev. 7 - 2 3 of 14 www.diodes.com Thermal Shutdown GND June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Absolute Maximum Ratings Symbol Parameter ESD MM VCC VSD VFB VOUT PD TST TOP Machine Model ESD Protection Supply Voltage ON/OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Storage Temperature Operating Junction Temperature Rating Unit 400 +24 -0.3 to +18 -0.3 to +18 -1 Internally Limited -65 to +150 -40 to +125 V V V V V W o C o C Recommended Operating Conditions Symbol VOP TA Parameter Operating Voltage Operating Ambient Temperature AP1506 Document number: DS31015 Rev. 7 - 2 Min Max 4.5 22 -20 4 of 14 www.diodes.com 85 Unit V o C June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Electrical Characteristics (All Output Voltage Versions) Unless otherwise specified, VIN = 12V for 3.3V, 5V, adjustable version and VIN = 18V for the 12V version. ILOAD = 0.5A Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC. Symbol IFB Parameter Feedback Bias Current FOSC Oscillator Frequency FSCP Oscillator Frequency of Short Circuit Protect 150 - 10 30 50 - 1.4 - 100 0 3.6 4.5 - - -200 µA - -5 5 mA mA - 70 10 150 200 0.6 - 2.0 1.3 VLOGIC = 2.5V (OFF) - - -0.01 VLOGIC = 0.5V (ON) - -0.1 -1 TO263-5L (Note 3) 37 - TO220-5L(R) (Note 3) 31 - TO263-5L (Note 3) 6 - TO220-5L(R) (Note 3) 5 - Output = 0V ON/OFF Pin Logic Input Current ON/OFF Pin Input Current θJA Thermal Resistance Junction to Ambient θJC Thermal Resistance Junction to Case Notes: 127 110 -50 -100 173 173 Low (regulator ON) High (regulator OFF) Current Limit IL -10 ON/OFF Pin Logic Input Threshold Voltage ICL IH - ON/OFF pin = 5V VIN = 22V Max. Duty Cycle (ON) Min. Duty Cycle (OFF) VIL VIH Max Standby Quiescent Current DC ISTBY Typ. Output Leakage Output = -1V Current Quiescent Current Saturation Voltage IQ VFB = 1.3V (Adjustable version only) Min When current limit occurred and VFB < 0.5V, Ta = 25 oC IOUT = 3A No outside circuit VFB = 0V force driver on VFB = 0V force driver on VFB = 12V force driver off Peak current No outside circuit VFB = 0 force driver on No outside circuit VFB = 12 force driver off VIN = 22V VFB = 12 force driver off VSAT IL Conditions Unit nA KHz KHz 1.6 V 1.7 5.5 % A 6.5 µA V µA o C/W o C/W 2 3. Test condition: Device mounted with copper area of approximately 3 in , no air flow. AP1506 Document number: DS31015 Rev. 7 - 2 5 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Electrical Characteristics (Continued) Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC. Symbol Parameter VFB Output Feedback AP1506-ADJ Conditions 5V < VIN < 22V 0.2A < ILOAD < 3A VOUT programmed for 3V VMin Typ. VMax 1.193 1.23 1.267 1.18 - 1.28 V η Efficiency VIN = 12V, ILOAD = 3A - 74 - VOUT Output Voltage 5.5V < VIN < 22V 0.2A < ILOAD < 3A 3.168 3.3 3.432 3.135 - 3.465 η Efficiency VIN = 12V, ILOAD = 3A - 75 - VOUT Output Voltage 8V < VIN < 22V 0.2A < ILOAD < 3A 4.8 5 5.2 4.75 - 5.25 η Efficiency VIN = 12V, ILOAD = 3A - 80 - VOUT Output Voltage 15V < VIN < 22V 0.2A < ILOAD < 3A 11.52 12 12.48 11.4 - 12.6 Efficiency VIN = 16V, ILOAD = 3A - 89 - AP1506-3.3V AP1506-5V AP1506-12V η AP1506 Document number: DS31015 Rev. 7 - 2 6 of 14 www.diodes.com Unit % V % V % V % June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Functional Description Pin Functions +VIN This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Ground Circuit ground. Output Internal switch. The voltage at this pin switches between (+VIN – VSAT) and approximately – 0.5V, with a duty cycle of approximately VOUT / VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept to a minimum. Feedback (FB) Senses the regulated output voltage to complete the feedback loop. ON/OFF (SD) Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 150uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 18V) shuts the regulator down. If this shutdown feature is not needed, the ON / OFF pin can be wired to the ground pin. Thermal Considerations The AP1506 is available in two packages: a 5-pin TO220 and a 5-pin surface mount TO263. The TO220 package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The AP1506 junction temperature rises above ambient temperature for a 3A load and different input and output voltages. The data for these curves was taken with the AP1506 (TO220 package) operating as a buck-switching regulator in an ambient temperature of 25oC (still air). These temperature rise numbers are all approximate and there are many factors that can affect these temperatures. Higher ambient temperatures require more heat sinking. The TO263 surface mount package tab was designed to be soldering to the copper on a printed circuit board. The copper and the board are the heat sink for this package and the other heat producing components, such as the catch diode and inductor. The PC board copper area that the package is soldered to should be at least 0.8 in2, and ideally should have 2 or more square inches of 2 oz. Additional copper area improves the thermal characteristics, but with copper areas greater than approximately 6 in2, only small improvements in heat dissipation are realized. If further thermal improvements are needed, double sided, multi-layer PC board with large copper areas and/or airflow will be recommended. AP1506 Document number: DS31015 Rev. 7 - 2 7 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Functional Description (Continued) The AP1506 (TO263 package) junction temperature rises above ambient temperature with a 2A load for various input and output voltages. This data was taken with the circuit operating as a buck-switching regulator with all components mounted on a PC board to simulate the junction temperature under actual operating conditions. This curve can be used for a quick check for the approximate junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. When load currents higher than 3A are used, double sided or multi-layer PC boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout (Once exception to this is the output (switch) pin, which should not have large areas of copper). Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are: trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board. AP1506 Document number: DS31015 Rev. 7 - 2 8 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics AP1506 Efficiency vs. Temperature (VIN = 12V, VOUT = 3.3V, Io = 3A) 83 78 82 81 77 80 76 79 75 Efficiency (%) Efficiency (%) AP1506 Efficiency vs. Temperature (VIN = 12V, VOUT = 5V, Io = 3A) 78 77 76 75 74 73 74 73 72 71 70 -50 -30 -10 10 30 50 70 90 110 130 150 o 72 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) ( C) Temperature (TA) AP1506 Saturation Voltage vs. Temperature (Vcc = 12V, VFB = 0V, VSD = 0) AP1506 Switch Current Limit vs. Temperature (Vcc = 12V, VFB = 0V) 1.6 Switch Current Limit (A) 5.5 Saturation Voltage (V) 1.5 3A 1.4 1.3 2A 1.2 1A 1.1 0.5A 1 0.9 5 4.5 4 3.5 0.8 3 0.7 -50 -25 0 25 50 o 75 Temperature (TA) ( C) 100 -50 125 -30 -10 10 30 o 50 70 90 Temperature (TA) ( C) 15 14 13 12 11 10 9 8 7 6 5 60 Supply Current (uA) Supply Current (mA) AP1506 Supply Current vs. Temperature (Vcc = 12V, No Load, Von/off = 0V (Switch ON), Von/off = 5V (Switch OFF)) Switch ON 55 50 Switch OFF 45 40 35 30 -50 -30 -10 10 30 50 70 90 110 130 150 -50 -30 -10 10 o AP1506 Document number: DS31015 Rev. 7 - 2 30 50 70 90 110 130 150 o Temperature (TA) ( C) Temperature (TA) ( C) 9 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics (Continued) AP1506 Threshold Voltage vs. Temperature (Vcc = 12V, Io = 100mA) AP1506 ON/OFF Current vs. ON/OFF Voltage (VIN = 12V) 1.7 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 1.5 ON/OFF Current (nA) Threshold Voltage (V) 1.6 1.4 1.3 1.2 1.1 1 0.9 0.8 -50 -30 -10 10 30 50 70 90 110 130 150 0 Temperature (TA) (oC) 6 9 12 15 18 21 ON/OFF Voltage (V) AP1506 Frequency vs. Temperature (Vcc = 12V, Ic = 500mA, VOUT = 5V) AP1506 Feedback Current vs. Temperature (Vcc = 12V, VOUT = 5V, VFB = 1.3V) 170 10 165 0 Feedback Current (nA) Frequency (KHz) 3 160 155 150 145 140 -10 -20 -30 -40 -50 -50 -30 -10 10 30 50 70 o 90 110 130 150 -50 -30 -10 10 30 50 70 90 110 130 150 o Temperature (TA) ( C) Temperature (TA) ( C) AP1506 Output Voltage vs. Temperature (VIN = 12V, Io = 3A) Vout (V) 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 3.05 3 2.95 2.9 -40 -20 0 20 40 60 80 o100 120 140 160 Temperature (TA) ( C) AP1506 Document number: DS31015 Rev. 7 - 2 10 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Ordering Information AP1506 - XX XXX X - X Output version Package Lead Free Blank : Adjustable 33 : 3.3V 50 : 5.0V 12 : 12V K5 : TO263-5L T5 : TO220-5L T5R : TO220-5L(R) L : Lead Free G : Green Device AP1506-XXK5L-13 AP1506-XXK5G-13 AP1506-XXT5L-U AP1506-XXT5G-U AP1506-XXT5RL-U AP1506-XXT5RG-U Notes: Package Code Packaging (Note 4) K5 K5 T5 T5 T5R T5R TO263-5L TO263-5L TO220-5L TO220-5L TO220-5L(R) TO220-5L(R) Tube/Bulk Quantity Part Number Suffix NA NA NA NA 50 -U 50 -U 50 -U 50 -U Packing U : Tube 13 : Tape & Reel 13” Tape and Reel Part Number Quantity Suffix 800/Tape & Reel -13 800/Tape & Reel -13 NA NA NA NA NA NA NA NA 4. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. AP1506 Document number: DS31015 Rev. 7 - 2 11 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Marking Information (1) TO263-5L ( Top view ) Output Type: 1506 : ADJ 1506-33 : 3.3V 1506-50 : 5.0V 1506-12 : 12V Logo 1506- XX YY WW X X L : Lead Free G : Green ID code Xth week: 01~52 Year: "07" = 2007 "08" = 2008 ~ (2) TO220-5L(R) ( Top view ) Output Type: 1506 : ADJ 1506-33 : 3.3V 1506-50 : 5.0V 1506-12 : 12V Logo 1506- XX YY WW X X L : Lead Free G : Green ID code Xth week: 01~52 Year: "07" = 2007 "08" = 2008 ~ AP1506 Document number: DS31015 Rev. 7 - 2 12 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER Package Outline Dimensions (All Dimensions in mm) (1) Package Type: TO263-5L (2) Package Type: TO220-5L AP1506 Document number: DS31015 Rev. 7 - 2 13 of 14 www.diodes.com June 2010 © Diodes Incorporated AP1506 150KHz, 3A PWM BUCK DC/DC CONVERTER IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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