AP1507_08

AP1507 150KHz, 3A PWM BUCK DC/DC CONVERTER 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: 3A Lead Free Package: TO252-5L Low Power Standby Mode Built-in Switching Transistor On Chip Lead Free Package: TO252-5L Lead Free Finish/ RoHS Compliant (Note 1) General Description The AP1507 is a monolithic IC designed for a step-down DC/DC converter and is capable of driving a 3A load without an 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 the feedback control have good line and load regulation without an external design. Regarding the protected function, the thermal shutdown is to prevent over temperature operating from damaging the device, and current limit is against over current operating of the output switch. If the current limit function occurred and VFB is down to 0.5V below, the switching frequency will be reduced. The AP1507 series operates 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 a fixed 3.3V, 5V, 12V, and an adjustable type. AP1507 is available in a 5-lead TO-252 lead-free package. Applications • • • Simple High-Efficiency Step-Down Regulator On-Card Switching Regulators Positive to Negative Converter Ordering Information AP1507 - XX XX X X Output Version Blank : Adjustable 33 : 3.3V 50 : 5.0V 12 : 12V Package D5 : TO252-5L Lead Free L : Lead Free Packing -U : Tube -13 : Tape & Reel Device AP1507-XXD5 Lead-free Package Code D5 Packaging (Note 2) TO252-5L Tube/Bulk Part Number Quantity Suffix 80 -U 13” Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel -13 Notes: 1. RoHS revision 13.2.2003. Glass and high temperature solder exemptions applied, see EU Directive Annex Notes 5 and 7. 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. AP1507 Rev. 2 1 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated AP1507 150KHz, 3A PWM BUCK DC/DC CONVERTER Pin Assignments Pin Descriptions (Top View) 5 SD 4 FB 3 GND 2 Output 1 VIN Metal Tab GND Name VIN Output GND FB SD Description Operating Voltage Input Switching Output Ground Output Voltage Feedback Control ON /OFF Shutdown TO252-5L Block Diagram SD VIN 200mV Current Source Bias 1.235V Reference 2.5V Regulator Start Up 220mV + Comp _ Comp + FB Comp + AP1507 Rev. 2 2 of 11 www.diodes.com _ + Amp _ Frequency Compensation PreDriver 150kHz OSC. Thermal Shutdown _ 3A Switch Output GND FEBRUARY 2008 © Diodes Incorporated AP1507 150KHz, 3A PWM BUCK DC/DC CONVERTER Absolute Maximum Ratings Symbol ESD HBM ESD MM VCC VSD VFB VOUT PD TST TJ Parameter Human Body Model ESD Protection 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 2 200 +24 -0.3 to +18 -0.3 to +18 -1 Internally Limited -65 to +150 -40 to +125 Unit KV V V V V V W o C o C Recommended Operating Conditions Symbol IOUT VOP TA Parameter Output Current Operating Voltage Operating Ambient Temperature Min 0 4.5 -20 Max 3 22 85 Unit A V o C AP1507 Rev. 2 3 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated AP1507 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 FOSC FSCP VSAT DC ICL Parameter Feedback Bias Current Oscillator Frequency Oscillator Frequency of Short Circuit Protect Saturation Voltage Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Current Limit Output = 0V Output leakage current Conditions VFB = 1.3V ( Adjustable Version Only ) Min. Typ. -10 127 110 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 = 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) VLOGIC = 2.5V (OFF) VLOGIC = 0.5V (ON) Junction to TO252-5L Case TO252-5L Junction to Ambient 10 150 30 1.4 100 0 Max. -50 -100 173 173 50 1.6 1.7 Unit nA KHz KHz V % 3.6 4.5 5.5 6.5 -200 A uA mA mA uA V uA o ILEAK IQ ISTBY VIL VIH IH IL θJA θJC Output = -1V Quiescent Current Standby Quiescent Current ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Logic Input Current ON/OFF Pin Input Current Thermal Resistance Thermal Resistance with copper area of approximately 2cm ×2cm -5 5 70 2.0 1.3 10 150 200 0.6 -0.01 -0.1 10 50 -1 C/W C/W o AP1507 Rev. 2 4 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated AP1507 150KHz, 3A PWM BUCK DC/DC CONVERTER Electrical Characteristics Symbol VFB (Continued) Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC. Parameter Output Feedback Efficiency Output Voltage Efficiency Output Voltage Efficiency Output Voltage Efficiency Conditions 5V < VIN < 22V 0.2A < ILOAD < 3A VOUT Programmed for 3V VIN = 12V, ILOAD = 3A 5.5V < VIN < 22V 0.2A < ILOAD < 3A VIN = 12V, ILOAD = 3A 8V < VIN < 22V 0.2A < ILOAD < 3A VIN = 12V, ILOAD = 3A 15V < VIN < 22V 0.2A < ILOAD < 3A VIN = 16V, ILOAD = 3A VMin 1.193 1.18 Typ. 1.23 74 VMax 1.267 1.28 Unit V % AP1507-ADJ η VOUT AP1507-3.3V 3.168 3.135 3.3 75 3.432 3.465 V % η VOUT AP1507-5V 4.8 4.75 5 80 5.2 5.25 V % η VOUT AP1507-12V 11.52 11.4 12 89 12.48 12.6 V % η AP1507 Rev. 2 5 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated AP1507 150KHz, 3A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics AP1507 Efficiency vs. Temperature (Vin = 12V, Vout = 5V, Io = 3A) 83 82 81 80 79 78 77 76 75 74 73 72 -50 -30 -10 10 30 50 70 90 110 130 150 AP1507 Efficiency vs. Temperature (Vin = 12V, Vout = 3.3V, Io = 3A) 78 77 76 Efficiency (%) Efficiency (%) 75 74 73 72 71 70 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Temperature (TA) (°C) AP1507 Saturation Voltage vs. Temperature = 12V, Vfb = 0V, VSD = 0) 1.6 1.5 (Vcc AP1507 Switch Current Limit vs. Temperature (Vcc = 12V, Vfb = 0V) 5.5 Saturation Voltage (V) 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 -50 -25 0 25 1A 0.5A 3A 2A Switch Current Limit (A) 5 4.5 4 3.5 3 50 75 100 125 -50 -30 -10 10 30 50 70 90 Temperature (TA)　(°C) Temperature (TA) (°C) AP1507 Supply Current vs. Temperature (Vcc = 12V, No Load, Von/off = 0V (Switch ON), Von/off = 5V (Switch OFF)) 15 14 13 12 11 10 9 8 7 6 5 60 Supply Current (mA) Supply Current (uA) 55 50 45 40 35 30 Switch OFF Switch ON -50 -30 -10 10 30 50 70 90 110 130 150 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Temperature (TA) (°C) AP1507 Rev. 2 6 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated AP1507 150KHz, 3A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics AP1507 Threshold Voltage vs. Temperature (Vcc = 12V, Io = 100mA) 1.7 1.6 (Continued) AP1507 ON/OFF Current vs. ON/OFF Voltage (Vin= 12V) 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 0 3 6 9 12 15 18 21 Threshold Voltage (V) 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) (°C) ON/OFF Current (nA) 1.5 ON/OFF Voltage (V) AP1507 Frequency vs. Temperature (Vcc = 12V, Io = 500mA, Vout = 5V) 170 AP1507 Feedback Current vs. Temperature (Vcc = 12V, Vout = 5V, Vfb = 1.3V) 10 160 155 150 145 140 -50 -30 -10 10 30 50 70 90 110 130 150 Feedback Current (nA) 165 0 -10 -20 -30 -40 -50 -50 -30 -10 10 30 50 70 90 110 130 150 Frequency (KHz) Temperature (TA) (°C) Temperature (TA) (°C) AP1507 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 Vout (V) Temperature (TA) (°C) AP1507 Rev. 2 7 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated AP1507 150KHz, 3A PWM BUCK DC/DC CONVERTER Typical Application Circuit (1) Fixed Type Circuit FB 12V DC Input Vin Cin Capacitor 1 5 SD 4 AP1507 -33 3 2 Output L1 33uH Inductor D1 Schottky Diode 3.3V/3A Output Load GND Co Capacitor (2) Adjustable Type Circuit R2 FB 12V DC Input Vin Cin Capacitor 1 5 SD 4 AP1507 3 GND D1 Schottky Diode Co Capacitor 2 Output L1 47uH 5V/ 3A Output Load R1 Vout = VFB × (1 + VFB = 1.23V R2 = 1K ~ 3K (3) Delay Start Circuit R2 FB 12V DC Input Vin Cin Capacitor CDELAY 0.1uF 1 5 SD RDELAY 10K 4 AP1507 3 2 R1 R2 ) R1 Output L1 47uH 5V/ 3A Output Load GND D1 Schottky Diode Co Capacitor AP1507 Rev. 2 8 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated AP1507 150KHz, 3A PWM BUCK DC/DC CONVERTER Applications Information Pin Functions +VIN This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present 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 at 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 TO-252 surface mount package tab is designed to be soldered 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 2 to should be at least 0.8 in , and ideally should have 2 or more square inches of 2 oz. additional copper area which improves the thermal characteristics. With copper areas greater than 2 approximately 6 in , 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 AP1507 (TO-252 package) junction temperature rises above ambient temperature with a 3A 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 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. (One 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. AP1507 Rev. 2 9 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated AP1507 150KHz, 3A PWM BUCK DC/DC CONVERTER Marking Information (1) TO252-5L ( Top view ) Logo Output Type : Blank : Adjustable 1507-33 : 3.3V 1507-50 : 5.0V 1507-12 : 12V 1507 - XX YY WW X X Internal code L : Lead Free Xth Week : 01~52 Year : "07" = 2007 "08" = 2008 ~ Package Information (1) Package Type: TO252-5L (All Dimensions in mm) AP1507 Rev. 2 10 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated AP1507 150KHz, 3A 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. AP1507 Rev. 2 11 of 11 www.diodes.com FEBRUARY 2008 © Diodes Incorporated