AP1506 150kHz, 3A PWM BUCK DC/DC CONVERTER Description Pin Assignments The AP1506 series are monolithic IC designed for a step-down 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. (Top View) 5 SD 4 FB 3 GND 2 Output 1 VIN Metal Tab GND TO263-5 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 TO263-5, TO220-5 and TO220-5 (R). (Top View) 5 SD 4 FB 3 GND 2 Output 1 VIN TO220-5/TO220-5 (R) Features 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 Simple High-Efficiency Step-Down Regulator Voltage Mode Non-Synchronous PWM Control On-Card Switching Regulators Thermal-Shutdown and Current-Limit Protection Positive to Negative Converter ON/OFF Shutdown Control Input Operating Voltage can be up to 22V Output Load Current: 3A Low Power Standby Mode Built-in Switching Transistor On Chip Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free."Green" Device (Note 3) Notes: Applications 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated's definitions of Halogen- and Antimony-free,"Green" and Lead-free. 3. Halogen- and Antimony-free "Green" products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. AP1506 Document number: DS31015 Rev. 8 - 2 1 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 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 CIN Capacitor Output D1* Schottky Diode GND Co Capacitor (2) Adjustable Type Circuit R1 R2 FB 12V DC Input VIN 1 R1 AP1506 5 SD C IN Capacitor VOUT = VFB (1 + L1 47uH 4 Output 2 5V/ 3A Output Load 3 GND D1* Schottky Diode Co Capacitor ) R2 VFB = 1.23V R2 = 1k to 3k (3) Delay Start Circuit R2 R1 FB 12V DC Input VIN CDELAY C IN Capacitor Note: L1 47uH 4 0.1uF 2 AP1506 1 Output 5V / 3A Output Load 3 5 SD RDELAY 10K GND D1* Schottky Diode Co Capacitor For up to 2A = DFLS230L (VF = 0.42V) For up to 3A = B340LA, B340LB (VF = 0.45V) AP1506 Document number: DS31015 Rev. 8 - 2 2 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 Pin Descriptions Pin Number Pin Name Description 1 VIN 2 Output 3 GND 4 FB Output Voltage Feedback Control 5 SD ON/OFF Shutdown Operating Voltage Input Switching Output Ground 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. 8 - 2 3 of 14 www.diodes.com Thermal Shutdown GND December 2017 (c) Diodes Incorporated AP1506 Absolute Maximum Ratings Symbol ESD MM Parameter Machine Model ESD Protection Rating Unit 400 V VCC Supply Voltage +24 V VSD SD Pin Input Voltage -0.3 to +18 V VFB FB Pin Voltage -0.3 to +18 V -1 V VOUT Output Voltage to Ground PD Power Dissipation Internally Limited W TST Storage Temperature -65 to +150 C TOP Operating Junction Temperature -40 to +125 C Recommended Operating Conditions Symbol VOP TA Parameter Min Max Unit Operating Voltage 4.5 22 V Operating Ambient Temperature -20 +85 C AP1506 Document number: DS31015 Rev. 8 - 2 4 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 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 = +25C. Symbol IFB Parameter Conditions VFB = 1.3V Feedback Bias Current (Adjustable version only) -- Min Typ Max -- -10 127 150 173 110 -- 173 10 30 50 Unit -50 -100 nA fOSC Oscillator Frequency fSCP Oscillator Frequency of Short Circuit Protection VSAT Saturation Voltage No outside circuit VFB = 0V force driver on -- 1.4 Max. Duty Cycle (ON) VFB = 0V force driver on -- 100 -- Min. Duty Cycle (OFF) VFB = 12V force driver off -- 0 -- Current Limit Peak current No outside circuit VFB = 0 force driver on 3.6 4.5 No outside circuit VFB = 12V force driver off -- -- -200 A VIN = 22V -- -5 -- mA Quiescent Current VFB = 12V force driver off -- 5 10 mA Standby Quiescent Current SD pin = 5V VIN = 22V -- 70 Low (Regulator ON) 0 -- High (Regulator OFF) 2.0 -- When current limit occurred and VFB < 0.5V, TA = 25C IOUT = 3A DC ICL IL Output = 0V Output = -1V IQ ISTBY VIL Notes: Output Current Leakage kHz kHz 1.6 V 1.7 % 5.5 A 6.5 150 200 A 0.6 VIH SD Pin Logic Input Threshold Voltage IH SD Pin Logic Input Current VLOGIC = 2.5V (OFF) -- -- -0.01 IL SD Pin Input Current VLOGIC = 0.5V (ON) -- -0.1 -1 JA Thermal Resistance Junction to Ambient TO263-5 (Note 4) -- 37 -- TO220-5 (R) (Note 4) -- 31 -- JC Thermal Resistance Junction to Case TO263-5 (Note 4) -- 6 -- TO220-5 (R) (Note 4) -- 5 -- V VIN (Note 5) A C/W C/W 4. Test condition: Device mounted with copper area of approximately 3 inch2, no air flow. 5. Maximum voltage applied to VSD is the lower of VIN or 16V. AP1506 Document number: DS31015 Rev. 8 - 2 5 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 Electrical Characteristics (Cont.) Specifications with boldface type are for full operating temperature range, the other type are for TJ = +25C. Symbol AP1506-ADJ VFB AP1506-3.3V AP1506-5V AP1506-12V VOUT VOUT VOUT Parameter Conditions Min Typ Max 1.193 1.23 1.267 1.18 -- 1.28 -- 74 -- 3.168 3.3 3.432 3.135 -- 3.465 Output Feedback 5V < VIN < 22V 0.2A < ILOAD < 3A VOUT programmed for 3V Efficiency VIN = 12V, ILOAD = 3A Output Voltage 5.5V < VIN < 22V 0.2A < ILOAD < 3A Efficiency VIN = 12V, ILOAD = 3A -- 75 -- 8V < VIN < 22V 0.2A < ILOAD < 3A 4.8 5 5.2 4.75 -- 5.25 -- 80 -- 11.52 12 12.48 11.4 -- 12.6 -- 89 -- Output Voltage Efficiency VIN = 12V, ILOAD = 3A Output Voltage 15V < VIN < 22V 0.2A < ILOAD < 3A Efficiency VIN = 16V, ILOAD = 3A AP1506 Document number: DS31015 Rev. 8 - 2 6 of 14 www.diodes.com Unit V % V % V % V % December 2017 (c) Diodes Incorporated AP1506 Typical Performance Characteristics AP1506 Efficiency vs. Temperature (VIN = 12V, VOUT = 5V, Io = 3A) AP1506 Efficiency vs. Temperature (VIN = 12V, VOUT = 3.3V, Io = 3A) 83 78 82 77 81 Efficiency (%) Efficiency (%) 80 79 78 77 76 75 76 75 74 73 72 74 71 73 72 70 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (oC) -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (oC) AP1506 Saturation Voltage vs. Temperature (VCC = 12V, VFB = 0V, VSD = 0) AP1506 Switch Current Limit vs. Temperature (VCC = 12V, VFB = 0V) 1.6 Saturation Voltage (V) Switch Current Limit (A) 5.5 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 75 Temperature (TA) (oC) 100 -50 125 -30 -10 10 30 50 Temperature (TA) (oC) 70 90 60 15 14 13 12 11 10 9 8 7 6 5 55 Supply Current (A) Supply Current (mA) AP1506 Supply Current vs. Temperature (VCC = 12V, No Load, VON/OFF = 0V (Switch ON), VON/OFF = 5V (Switch OFF)) Switch ON 50 Switch OFF 45 40 35 30 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (oC) AP1506 Document number: DS31015 Rev. 8 - 2 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (oC) 7 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 Typical Performance Characteristics (Cont.) AP1506 Threshold Voltage vs. Temperature (VCC = 12V, IO = 100mA) AP1506 ON/OFF Current vs. ON/OFF Voltage (VIN = 12V) 1.7 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 Temperature (TA) (oC) 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 0 6 9 12 15 ON/OFF Voltage (V) 18 21 AP1506 Feedback Current vs. Temperature (Vcc = 12V, VOUT = 5V, VFB = 1.3V) 170 10 165 0 Feedback Current (nA) Frequency (kHz) AP1506 Frequency vs. Temperature (VCC = 12V, IC = 500mA, VOUT = 5V) 3 160 155 150 145 140 -10 -20 -30 -40 -50 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (oC) -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (oC) VOUT (V) Output Voltage vs. Temperature (VIN = 12V, Io = 3A) 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 80 100 120 140 160 Temperature (TA) (oC) AP1506 Document number: DS31015 Rev. 8 - 2 8 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 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 (+V IN - 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 150A. 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 SD pin can be wired to the ground pin. Thermal Considerations The TO263-5 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 inch2, 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 inch2, 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. The AP1506 (TO263-5 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. The TO220-5 and TO220-5 (R) package options (NRND) need 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 (TO220-5 and TO220-5 (R) packages) operating as a buck-switching regulator in an ambient temperature of +25C (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. 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. 8 - 2 9 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 Ordering Information AP1506 XX XXX X - X Output Version Package Green Packing Blank : Adjustable 33 : 3.3V 50 : 5.0V 12 : 12V K5 : TO263-5 T5 : TO220-5 T5R : TO220-5 (R) L : Lead Free G : Green U : Tube 13 : Tape & Reel Part Number Suffix Voltage (V) Package Code Package (Note 7) Green AP1506-12K5G-13 12 K5 TO263-5 Green AP1506-33K5G-13 3.3 K5 TO263-5 AP1506-50K5G-13 5.0 K5 AP1506-K5G-13 ADJ AP1506-T5G-U ADJ AP1506-T5RG-U ADJ Part Number Notes: Status (Note 6) Alternative -13 NRND None NA -13 NRND None 800 NA -13 In production -- Green 800 NA -13 In production -- Green 50 -U NA NRND None Green 50 -U NA NRND None Quantity Tube 13" Tape and Reel 800 NA Green 800 TO263-5 Green K5 TO263-5 T5 TO220-5 T5R TO220-5 (R) 6. All Lead-free versions in TO220-5/(R) are End of Life (EOL) with no replacement. All green fixed output voltage versions in TO220-5/(R) are End of Life (EOL) with no replacement; Adjustable versions are Not Recommended for New Designs (NRND). All Lead free versions in TO263-5 are End of Life (EOL) with limited replacement. 7. For packaging details, go to our website at: https://www.diodes.com/design/support/packaging/diodes-packaging/diodes-package-outlines-and-pad-layouts/. AP1506 Document number: DS31015 Rev. 8 - 2 10 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 Marking Information (Note 6) (1) TO263-5 ( 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) TO220-5/ TO220-5 (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. 8 - 2 11 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 Package Outline Dimensions (All Dimensions in mm) Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: TO263-5 A E D TO263-5 Dim Min Max A 4.07 4.85 A1 1.14 1.40 b 0.66 1.02 c 0.36 0.64 D 8.65 9.65 E 9.78 10.54 e 1.57 1.85 L 14.61 15.88 L1 2.29 2.79 L2 2.92 All Dimensions in mm A1 L2 L L1 e (2) b c Package Type: TO220-5 TO220-5 Dim Min Max A 3.55 4.85 b 0.51 1.14 b1 1.14 1.78 C 0.31 1.14 D 14.20 16.50 D1 5.84 6.86 E 9.78 10.54 e 1.6 1.8 e1 6.6 7.0 F 0.51 1.40 J1 2.03 2.92 L 12.72 14.72 L1 3.66 6.35 P 3.53 4.09 Q 2.54 3.43 All Dimensions in mm AP1506 Document number: DS31015 Rev. 8 - 2 12 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 Package Outline Dimensions (Cont. All Dimensions in mm) Please see http://www.diodes.com/package-outlines.html for the latest version. (3) Package Type: TO220-5 (R) TO220-5(R) Dim Min Typ Max A 4.37 4.57 4.77 A1 1.12 1.27 1.40 A2 2.45 2.65 2.85 A3 4.10 4.40 4.70 A4 7.95 8.25 8.55 b 0.64 0.79 0.94 c 0.35 0.38 0.55 D 14.80 15.00 15.20 D1 8.50 8.70 8.90 e 1.70 E 9.96 10.16 10.36 H1 6.10 6.30 6.50 H2 21.32 22.12 22.92 H3 24.15 24.95 25.75 L 6.30 L1 13.10 13.50 13.90 P 3.64 3.84 4.04 Q 2.55 2.75 2.95 All Dimensions in mm Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: TO263-5 X Dimensions X X1 Y Y1 Y2 C Y1 Y Value (in mm) 10.9 1.05 15.7 9.1 2.5 1.7 Y2 X1 C AP1506 Document number: DS31015 Rev. 8 - 2 13 of 14 www.diodes.com December 2017 (c) Diodes Incorporated AP1506 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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Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2017, Diodes Incorporated www.diodes.com AP1506 Document number: DS31015 Rev. 8 - 2 14 of 14 www.diodes.com December 2017 (c) Diodes Incorporated