AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER General Description 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 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 (No Br, Sb) Lead Free Finish/RoHS Compliant for Lead Free and “Green” products (Note 1) The AP1509 series are monolithic IC designed for a step-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 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 will be reduced. The AP1509 series operates at a switching frequency of 150KHz thus allow 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 chips are available in a standard 8-lead SOP-8 package. Applications • • • Simple High-Efficiency Step-Down Regulator On-Card Switching Regulators Positive to Negative Converter Ordering Information AP1509 XX X X X Output version Package Blank : Adjustable 33 : 3.3V 50 : 5.0V 12 : 12V S: SOP-8L Device AP1509-XXS Package Packaging Code (Note 1) S SOP-8L Lead Free L: Lead Free G: Green Packing -U : Tube -13: Taping Tube Part Number Quantity Suffix 100 -U -13” Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel Note: 1. 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. AP1509 Rev. 1 1 of 12 www.diodes.com DECEMBER 2006 © Diodes Incorporated -13 AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Pin Descriptions Pin Assignments (Top View) VIN Output FB SD 1 2 3 4 8 7 6 5 Name VIN Output GND FB SD GND GND GND GND Description Operating voltage input Switching output Ground Output voltage feedback control ON/OFF Shutdown SOP-8L 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 2A Switch Output 150kHz OSC. AP1509 Rev. 1 2 of 12 www.diodes.com Thermal Shutdown Gnd DECEMBER 2006 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Absolute Maximum Ratings Symbol Parameter Rating Unit +24 V VCC Supply Voltage 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 Power Dissipation Internally Limited Storage Temperature -65 to +150 o TOP Operating Temperature -40 to +125 VOP Operating Voltage +4.5 to +22 AP1509 Rev. 1 3 of 12 www.diodes.com W o C C V DECEMBER 2006 © Diodes Incorporated AP1509 150KHz, 2A 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 VSAT Saturation Voltage DC Max. Duty Cycle (ON) Min. Duty Cycle (OFF) ICL Current Limit IL IQ ISTBY VIL VIH IH IL Output Leakage Output = -1 Current Quiescent Current Standby Quiescent Current Output = 0 ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Logic Input Current ON/OFF Pin Input Current 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) Min. Typ. -10 127 110 150 10 30 Unit 50 KHz nA KHz 1.4 1.25 V 1.5 100 0 % 3 A -200 -5 5 70 2.0 1.3 VLOGIC = 2.5V (OFF) VLOGIC = 0.5V (ON) Max. -50 -100 173 173 uA mA mA 10 150 200 0.6 uA V -0.01 uA -0.1 -1 ΘJC Thermal Resistance SOP-8L Junction to case 15 o ΘJA Thermal Resistance with a copper area of approximately 3 in2 SOP-8L Junction to ambient 70 o AP1509 Rev. 1 4 of 12 www.diodes.com C/W C/W DECEMBER 2006 © 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 AP1509-ADJ AP1509-3.3V AP1509-5V AP1509-12V AP1509 Rev. 1 Conditions VMin Typ. VMax Unit VFB Output Feedback 4.5V < VIN < 22V 0.2A < ILOAD < 2A VOUT programmed for 3V 1.193 1.18 1.23 1.267 1.28 V η Efficiency VIN = 12V, ILOAD=2A 76 76 Output Voltage 4.75V < VIN < 22V 0.2A < ILOAD < 2A 3.168 3.135 3.3 Efficiency VIN = 12V, ILOAD = 2A 78 78 Output Voltage 7V < VIN < 22V 0.2A < ILOAD < 2A 4.8 4.75 5 Efficiency VIN = 12V, ILOAD = 2A 83 83 Output Voltage 15V < VIN < 22V 0.2A < ILOAD < 2A 11.52 11.4 12 Efficiency VIN = 15V, ILOAD = 2A 90 90 VOUT η VOUT η VOUT η Parameter 5 of 12 www.diodes.com % 3.432 3.465 V % 5.2 5.25 V % 12.48 12.6 V % DECEMBER 2006 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Application Circuit (1) Fixed Type Circuit FB 12V DC Input 3 Vin 1 AP1509 -33 4 5 6 Output 2 7 Output Load Inductor 8 SD GNDGNDGND GND Cin Capacitor 3.3V/2A L1 47uH D1 Schottky Diode Co Capacitor (2) Adjustable Type Circuit R2 1K R1 1K FB 12V DC Input L1 39uH 3 1 Vin 2 AP1509 Output Inductor 5 6 7 8 4 SD Gnd Gnd Gnd Gnd Cin Capacitor Vout = VFB × (1 + 2.5V/2A Output Load R1 D1 Schottky Diode Co Capacitor ) R2 VFB = 1.23V R2 = 1K ~ 3K (3) Delay Start Circuit R2 1K 12V DC Input FB AP1509 Rev. 1 L1 39uH 3 Vin CDELAY 0.1uF Cin Capacitor R1 1K RDELAY 10K 1 AP1509 4 5 6 2 7 Output 8 SD Gnd Gnd Gnd Gnd 2.5V/2A Output Load Inductor D1 Schottky Diode 6 of 12 www.diodes.com Co Capacitor DECEMBER 2006 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics AP1509 Efficiency vs. Temperature (Vin=12V, Vout=5V, Io=2A) 81 80 79 Efficiency (%) Efficiency (%) 86 85 84 83 82 81 80 79 78 77 76 75 AP1509 Efficiency vs. Temperature (Vin=12V, Vout=3.3V, Io=2A) 78 77 76 75 74 73 -50 -30 -10 10 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) AP1509 Saturation Voltage vs. Temperature (Vcc=12V, Vfb=0V, VSD=0) 50 70 90 110 130 150 AP1509 Switch Current Limit vs. Temperature (Vcc = 12V, Vfb = 0V) 1.4 Switch Current Limit (A) 5.5 1.3 Saturation Voltage (V) 30 Temperature (TA) (°C) 1.2 2A 1.1 1A 1 0.5A 0.9 0.8 0.7 -50 -25 0 25 50 75 100 5 4.5 4 3.5 3 -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 (Vcc=12V, No Load, Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF)) Switch ON -50 -30 -10 10 30 50 70 90 110 130 150 50 45 Switch OFF 40 35 30 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Temperature (TA) (°C) AP1509 Rev. 1 55 7 of 12 www.diodes.com DECEMBER 2006 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics (Continued) AP1509 Threshold Voltage vs. Temperature (Vcc=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) AP1509 Frequency vs. Temperature (Vcc=12V, Io=500mA, Vout=5V) 6 9 12 15 18 21 ON/OFF Voltage (V) AP1509 Feedback Current vs. Temperature (Vcc=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) Vout (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 AP1509 Rev. 1 0 20 40 60 80 100 120 140 160 Temperature (TA) (°C) 8 of 12 www.diodes.com DECEMBER 2006 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Function 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. AP1509 Rev. 1 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-8 package) operating as a buck-switching regulator in an ambient o temperature of 25 C (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. 9 of 12 www.diodes.com DECEMBER 2006 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics 1000 900 800 700 600 500 400 300 200 100 0 -40 Feedback Voltage vs. Temperature Vin = 5V; Vout = 15V 1.26 Feedback Voltage (V) Frequency (KHz) Frequency vs. Temperature Vin = 5V; Vout = 15V 10 60 1.25 1.24 1.23 1.22 -40 110 Temperature (oC) 110 Supply Current vs. Supply Voltage Vout = 15V; Iout = 0A 3 3 2.5 2.5 Supply Current (mA) Supply Current (mA) 60 Temperature (oC) Supply Current vs. Temperature Vin = 5V; Vout = 15V; Iout = 0A 2 1.5 1 0.5 0 -40 10 2 1.5 1 0.5 0 10 60 110 Temperature (oC) 0 5 10 15 Supply Voltage (V) Efficiency vs. Output Current Vin = 5V; Vout = 15V Efficiency vs. Output Current Vin = 3.3V; Vout = 15V 90 85 Efficiency (%) Efficiency (%) 85 80 75 75 65 55 70 0 20 40 60 Output Current (mA) 0 20 40 60 Output Current (mA) . AP1509 Rev. 1 10 of 12 www.diodes.com DECEMBER 2006 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER Marking Information (1) SOP-8L (Top view) Part Number Output Type: Blank: Adjustable 33: 3.3V 50: 5.0V 12: 12V Logo G: Green 1509-XX YY WW XX Date Code X: Internal code WW: Nth week YY: Year Package Information 0.254 0.08/0.25 5.79/6.20 3.70/4.10 (1) SOP-8L Gauge Plane Seating Plane 0.38/1.27 Detail "A" 7°~9° 0.20typ 1.30/1.50 1.75max. 0.35max. 45° 0.3/0.5 1.27typ 7°~9° Detail "A" 3.70/4.10 4.80/5.30 AP1509 Rev. 1 11 of 12 www.diodes.com DECEMBER 2006 © Diodes Incorporated AP1509 150KHz, 2A PWM BUCK DC/DC CONVERTER IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated. AP1509 Rev. 1 12 of 12 www.diodes.com DECEMBER 2006 © Diodes Incorporated