AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Description Pin Assignments The AP1509 series are monolithic IC designed for a step- (Top View) down DC/DC converter, and own the ability of driving a 2A load without additional transistor. It saves board space. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having good line and load regulation without external design. Regarding protected VIN 1 Output 2 8 GND 7 GND AP1509 function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. If current limit function occurs and VFB is down below 0.5V, the switching frequency FB 3 6 GND SD 4 5 GND will be reduced. The AP1509 series operates at a switching frequency of 150KHz thus allow smaller sized SOP-8L 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 chips are available in a standard 8-lead SOP-8 package. Features • Applications Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version • Adjustable Version Output Voltage Range, 1.23V to • • • Simple High-Efficiency Step-Down Regulator On-Card Switching Regulators Positive to Negative Converter 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: 2A • SOP-8L Packages • Low Power Standby Mode • Built-in Switching Transistor On Chip • SOP-8L: Available in “Green” Molding Compound • Lead Free Finish/ RoHS Compliant (Note 1) (No Br, Sb) Notes: 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. AP1509 Document number: DS31016 Rev. 4 - 2 1 of 13 www.diodes.com June 2010 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Application Circuit (1) Fixed Type Circuit FB 12V DC Input 3 AP150933 1 VIN 4 SD CIN Capacitor 5 6 7 L1 47uH Output 3.3V/2A Output Load 2 Inductor 8 GND GND GND GND (2) Adjustable Type Circuit R2 1K D1 Schottky Diode Co Capacitor R1 1K FB 12V DC Input L1 39uH 3 VIN CIN Capacitor 1 AP1509 2 4 5 8 SD 6 7 Output 2.5V/2A Output Load Inductor D1 Schottky Diode GND GND GND GND VOUT = VFB × (1 + R1 Co Capacitor ) R2 VFB = 1.23V R2 = 1K ~ 3K (3) Delay Start Circuit R2 1K R1 1K FB 12V DC Input VIN CDELAY 0.1uF 1 AP1509 2 4 5 8 SD CIN Capacitor L1 39uH 3 RDELAY 10K AP1509 Document number: DS31016 Rev. 4 - 2 6 7 Output GND GND GND GND 2.5V/2A Output Load Inductor D1 Schottky Diode 2 of 13 www.diodes.com Co Capacitor June 2010 © Diodes Incorporated AP1509 150KHz, 2A 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 _ Predriver Comp + 2A Switch Output 150kH z OSC. AP1509 Document number: DS31016 Rev. 4 - 2 3 of 13 www.diodes.com Thermal Shutdown GND June 2010 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Absolute Maximum Ratings Symbol Parameter Rating Unit KV ESD HBM Human Body Model ESD Protection ESD MM Machine Model ESD Protection 2 200 VIN Supply Voltage +24 V VSD ON/OFF Pin Input Voltage -0.3 to +18 V VFB Feedback Pin Voltage -0.3 to +18 V VOUT Output Voltage to Ground -1 V PD TST TJ Power Dissipation V Internally Limited Storage Temperature Operating Junction Temperature W -65 to +150 o -40 to +125 o C C Recommended Operating Conditions Symbol IOUT VOP TA Parameter Output Current Operating Voltage Operating Ambient Temperature AP1509 Document number: DS31016 Rev. 4 - 2 4 of 13 www.diodes.com Min 0 4.5 -20 Max 2 22 85 Unit A V o C June 2010 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Electrical Characteristics 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 VSAT Saturation Voltage DC Max. Duty Cycle (ON) Min. Duty Cycle (OFF) ICL Current Limit IL IQ ISTBY VIL VIH IH IL θJA θJC Output Leakage Output = -1 Current Quiescent Current Standby Quiescent Current Output = 0 ON/OFF Pin Logic Input Threshold Voltage Conditions VFB = 1.3V (Adjustable version only) When current limit occurred and VFB < 0.5V, Ta = 25 oC IOUT = 2A No outside circuit VFB = 0V force driver on VFB = 0V force driver on VFB = 12V force driver off Peak current No outside circuit VFB = 0V force driver on No outside circuit VFB = 12V force driver off VIN = 22V VFB = 12V force driver off ON/OFF pin = 5V VIN = 22V Low (regulator ON) High (regulator OFF) ON/OFF Pin Logic Input VLOGIC = 2.5V (OFF) Current ON/OFF Pin Input Current VLOGIC = 0.5V (ON) Junction to Thermal Resistance SOP-8L case Thermal Resistance Junction to SOP-8L with a copper area of ambient 2 approximately 3 in AP1509 Document number: DS31016 Rev. 4 - 2 5 of 13 www.diodes.com Min Typ. -10 127 110 150 10 30 Max -50 -100 173 173 Unit 50 KHz nA KHz 1.4 1.25 V 1.5 100 0 % 3 A -200 -5 5 70 2.0 1.3 uA mA mA 10 150 200 0.6 uA V -0.01 -0.1 uA -1 15 o 70 o C/W C/W June 2010 © Diodes Incorporated AP1509 150KHz, 2A 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 Typ. VMax Unit 1.193 1.18 1.23 1.267 1.28 V 76 76 3.168 3.135 3.3 78 78 4.8 4.75 5 83 83 11.52 11.4 12 90 90 4.5V < VIN < 22V 0.2A < ILOAD < 2A VOUT programmed for 3V η Efficiency VIN = 12V, ILOAD=2A Output Voltage 4.75V < VIN < 22V 0.2A < ILOAD < 2A Efficiency VIN = 12V, ILOAD = 2A Output Voltage 7V < VIN < 22V 0.2A < ILOAD < 2A Efficiency VIN = 12V, ILOAD = 2A Output Voltage 15V < VIN < 22V 0.2A < ILOAD < 2A Efficiency VIN = 15V, ILOAD = 2A η VOUT η VOUT AP1509-12V VMin Output Feedback VOUT AP1509-5V Conditions VFB AP1509-ADJ AP1509-3.3V Parameter η AP1509 Document number: DS31016 Rev. 4 - 2 6 of 13 www.diodes.com % 3.432 3.465 V % 5.2 5.25 V % 12.48 12.6 V % June 2010 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics AP1509 Efficiency vs. Temperature (VIN=12V, VOUT=5V, Io=2A) AP1509 Efficiency vs. Temperature (VIN=12V, VOUT=3.3V, Io=2A) 81 80 79 Efficiency (%) Efficiency (%) 86 85 84 83 82 81 80 79 78 77 76 75 78 77 76 75 74 73 -50 -30 -10 10 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) 50 70 90 110 130 150 Temperature (TA) (°C) AP1509 Saturation Voltage vs. Temperature (VIN =12V, VFB=0V, VSD=0) AP1509 Switch Current Limit vs. Temperature (VIN=12V, VFB=0V) 1.4 Switch Current Limit (A) 5.5 1.3 Saturation Voltage (V) 30 1.2 2A 1.1 1A 1 0.5A 0.9 0.8 5 4.5 4 3.5 3 0.7 -50 -25 0 25 50 75 100 -50 125 Temperature (TA) (°C) -30 -10 10 30 50 70 90 Temperature (TA) (°C) 15 14 13 12 11 10 9 8 7 6 5 60 Supply Current (uA) Supply Current (mA) AP1509 Supply Current vs. Temperature (VIN=12V, No Load, Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF)) Switch ON 55 50 45 Switch OFF 40 35 30 -50 -30 -10 10 30 50 70 90 110 130 150 Document number: DS31016 Rev. 4 - 2 30 50 70 90 110 130 150 Temperature (TA) (°C) Temperature (TA) (°C) AP1509 -50 -30 -10 10 7 of 13 www.diodes.com June 2010 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics (Continued) AP1509 Threshold Voltage vs. Temperature (VIN=12V, Io=100mA) AP1509 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 0 90 110 130 150 Temperature (TA) (°C) 6 9 12 15 18 21 ON/OFF Voltage (V) AP1509 Frequency vs. Temperature (VIN=12V, Io=500mA, VOUT=5V) AP1509 Feedback Current vs. Temperature (VIN=12V, VOUT=5V, Vfb=1.3V) 170 10 Feedback Current (nA) 165 Frequency (KHz) 3 160 155 150 145 140 0 -10 -20 -30 -40 -50 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) V OUT (V) AP1509 Output Voltage vs. Temperature (VIN=12V, Io=2A) 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) (°C) AP1509 Document number: DS31016 Rev. 4 - 2 8 of 13 www.diodes.com June 2010 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics (Continued) Feedback Voltage vs. Temperature (VIN=15V, VOUT=5V) 1.26 1000 900 800 700 600 500 400 300 200 100 0 Feedback Voltage (V) Frequency (KHz) Header Frequency vs. Temperature 1.25 1.24 1.23 1.22 -40 10 60 110 -40 o 60 110 Temperature ( C) Supply Current vs. Supply Voltage (VIN=15V, VOUT=5V, lOUT=0A) Supply Current vs. Temperature (VIN=15V, VOUT=5V, lOUT=0A) 3 3 2.5 2.5 Supply Current (mA) Supply Current (mA) 10 o Temperature ( C) 2 1.5 1 0.5 2 1.5 1 0.5 0 0 -40 10 o 60 0 110 5 Temperature ( C) 10 15 Supply Voltage (V) Efficiency vs. Output Current (VIN=15V, VOUT=3.3V) Efficiency vs. Output Current (VIN=15V, VOUT=5V) 90 85 Efficiency (%) Efficiency (%) 85 80 75 75 65 55 70 0 20 40 60 Output Current (mA) AP1509 Document number: DS31016 Rev. 4 - 2 0 20 40 60 Output Current (mA) 9 of 13 www.diodes.com June 2010 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Functions 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 minimized. Feedback Senses the regulated output voltage to complete the feedback loop. 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 SD pin can be wired to the ground pin. Thermal Considerations The SOP-8L 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 AP1509 junction temperature rises above ambient temperature for a 2A load and different input and output voltages. The data for these curves was taken with the AP1509 (SOP-8L package) operating as a buck-switching regulator in an ambient temperature of 25oC (still air). These temperature increments are all approximate and are affected by many factors. Higher ambient temperatures require more heat sinker. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout (One exception 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 increments are all approximate. The increments are affected by a lot of factors. 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. AP1509 Document number: DS31016 Rev. 4 - 2 10 of 13 www.diodes.com June 2010 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Ordering Information AP1509 - XX S X - 13 Output Version Package Lead Free Packing Blank : Adjustable 33 : 3.3V 50 : 5.0V 12 : 12V S : SOP-8L L : Lead Free G : Green 13 : Tape & Reel Device AP1509-XXSL-13 AP1509-XXSG-13 Notes: Package Code S S 13” Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13 Packaging (Note 2) SOP-8L SOP-8L 2. 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. Marking Information (1) SOP-8L ( Top View ) 8 Logo Part No. Output Type : Blank : Adjustable 1509-33 : 3.3V 1509-50 : 5.0V 1509-12 : 12V AP1509 Document number: DS31016 Rev. 4 - 2 5 1509-XX YY WW X X 1 4 11 of 13 www.diodes.com L : Lead Free G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code June 2010 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Package Outline Dimensions (All Dimensions in mm) 0.254 0.10/0.20 3.85/3.95 5.90/6.10 (1) Package Type: SOP-8L Gauge Plane Seating Plane 0.62/0.82 Detail "A" 7°~9° 0.15/0.25 1.30/1.50 1.75max. 0.35max. 45° 7°~9° Detail "A" 0°/8° 0.3/0.5 1.27typ 4.85/4.95 5.4 8x-0.60 8x-1.55 6x-1.27 Land Pattern Recommendation (Unit: mm) AP1509 Document number: DS31016 Rev. 4 - 2 12 of 13 www.diodes.com June 2010 © Diodes Incorporated AP1509 150KHz, 2A 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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