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| 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 - TO252-5L packages - Low power standby mode - Built-in switching transistor on chip General Description The AP1507 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 component, 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 against 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 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 fixed 3.3V, 5V, 12V, and an adjustable type. The package is available in a 5-lead TO-252. Applications - Simple High-efficiency step-down regulator - On-card switching regulators - Positive to negative converter Pin Assignments ( Top View ) 5 SD 4 FB 3 Gnd 2 Output 1 VIN Metal Tab GND Pin Descriptions Name VIN Output GND FB SD Description Operating voltage input Switching output Ground Output voltage feedback control ON /OFF Shutdown TO252-5L This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev.1.1 Oct 29, 2004 1/9 AP1507 150KHz, 3A PWM Buck DC/DC Converter Ordering Information AP1507 XX X X X Output version Blank : Adjustable -33 : 3.3V -50 : 5.0V -12 : 12V Package Lead Free Packing D5: TO252-5L Blank : Normal Blank : Tube L : Lead Free Package A : Taping Block Diagram SD VIN 200mV Current Source bias 1.235V Reference 2.5V Regulator Start up 220mV + Comp _ Comp + FB Comp + Anachip Corp. www.anachip.com.tw 2/9 _ + Amp _ Frequecy compensation Pre-driver 150kHz OSC. Thermal Shutdown _ 3A Switch Output Gnd Rev.1.1 Oct 29, 2004 AP1507 150KHz, 3A PWM Buck DC/DC Converter Absolute Maximum Ratings Symbol VCC VSD VFB VOUT PD TST TOP VOP Parameter Supply Voltage ON /OFF Pin input voltage Feedback Pin voltage Output voltage to Ground Power dissipation Storage temperature Operating temperature Operating voltage Rating +24 -0.3 to +18 -0.3 to +18 -1 Internally limited -65 to +150 -40 to +125 +4.5 to +22 Unit V V V V W o C o C V 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 Symbol IFB FOSC FSCP VSAT DC ICL ILEAK IQ ISTBY VIL VIH IH IL Parameter Feedback bias current Oscillator frequency Conditions VFB=1.3V (Adjustable version only) Min. Typ. -10 127 110 5 150 15 1.4 100 0 Max. -50 -100 173 173 25 1.6 1.7 Unit nA KHz KHz V % of When current limit occurred and VFB < 0.5V, Ta=25 oC IOUT=3A Saturation voltage No outside circuit VFB=0V force driver on Max. Duty Cycle (ON) VFB=0V force driver on Min. Duty Cycle (OFF) VFB=12V force driver off Peak current Current limit No outside circuit VFB=0V force driver on Output No outside circuit Output = 0V leakage VFB=12V force driver off current VIN=22V Output = -1V Quiescent Current VFB=12V force driver off Standby Quiescent ON /OFF pin=5V Current VIN=22V Low (regulator ON) ON /OFF pin logic input High (regulator OFF) threshold voltage ON /OFF pin logic input current Oscillator frequency short circuit protect 3.6 4.5 5.5 6.5 -200 A uA mA mA uA V -5 5 70 2.0 1.3 10 150 200 0.6 -0.01 VLOGIC=2.5V (OFF) -0.1 10 50 uA o JC JA ON /OFF pin input current VLOGIC=0.5V (ON) Junction to Thermal Resistance TO252-5L case Thermal Resistance Junction to With copper area of TO252-5L ambient approximately 2cm x2cm -1 C/W C/W o Specifications with boldface type are for full operating temperature range, the other type are for TJ=25C. Anachip Corp. www.anachip.com.tw 3/9 Rev.1.1 Oct 29, 2004 AP1507 150KHz, 3A PWM Buck DC/DC Converter Electrical Characteristics (Continued) Symbol VFB Parameter Output Feedback 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 Typ. 1.23 74 3.3 75 Limit 1.193/1.18 1.267/1.28 Unit V VMIN VMAX % AP1507-ADJ VOUT AP1507-3.3V 3.168/3.135 3.432/3.465 V VMIN VMAX % AP1507-5V VOUT VOUT Output voltage Efficiency Output voltage Efficiency 8V < VIN < 22V 0.2A < ILOAD < 3A VIN = 12V, ILOAD=3A 15V < VIN < 22V 0.2A < ILOAD < 3A VIN = 16V, ILOAD = 3A 5 80 12 89 4.8/4.75 5.2/5.25 V VMIN VMAX % V VMIN VMAX % AP1507-12V 11.52/11.4 12.48/12.6 Specifications with boldface type are for full operating temperature range, the other type are for TJ=25C. Anachip Corp. www.anachip.com.tw 4/9 Rev.1.1 Oct 29, 2004 AP1507 150KHz, 3A PWM Buck DC/DC Converter Typical Performance Characteristics AP1507 Efficiency v.s. 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 v.s. 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 v.s. Temperature (Vcc=12V,Vfb=0V,VSD=0) 1.6 1.5 AP1507 Switch Current Limit v.s. 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 -30 -10 10 30 50 70 90 50 75 100 125 Temperature (TA)(C) Temperature (TA) (C) AP1507 Supply Current v.s. 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 -50 -30 -10 10 30 50 70 90 110 130 150 Switch OFF Switch ON -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (C) Temperature (TA) (C) Anachip Corp. www.anachip.com.tw 5/9 Rev.1.1 Oct 29, 2004 AP1507 150KHz, 3A PWM Buck DC/DC Converter Typical Performance Characteristics (Continued) AP1507 Threshold Voltage v.s. Temperature (Vcc=12V , Io=100mA) 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 -50 -30 -10 10 30 50 70 90 110 130 150 AP1507 ON/OFF Current v.s. 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) Temperature (TA) (C) ON/OFF Current (nA) ON/OFF Voltage (V) AP1507 Frequency v.s. Temperature (Vcc=12V , Io=500mA ,Vout=5V) 170 AP1507 Feedback Current v.s. Temperature (Vcc=12V , Vout=5V,Vfb=1.3V) 10 160 155 150 145 140 -50 -30 -10 10 Feedback Current (nA) 165 0 -10 -20 -30 -40 -50 Frequency (KHz) Temperature (TA) (C) 30 50 70 90 110 130 150 -50 -30 -10 10 Temperature (TA) (C) 30 50 70 90 110 130 150 AP1507 Output Voltage v.s. 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 Vout (V) Temperature (TA) (C) 20 40 60 80 100 120 140 160 Anachip Corp. www.anachip.com.tw 6/9 Rev.1.1 Oct 29, 2004 AP1507 150KHz, 3A PWM Buck DC/DC Converter Typical Application Circuit (1) Fixed Type Circuit 12V DC Input Vin Cin Capacitor 1 5 FB 4 AP1507 -33 3 SD 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 4 1 AP1507 5 SD 3 Gnd D1 Schottky Diode Co Capacitor 2 Output L1 47uH 5V/ 3A Output Load R1 Vout = VFB x (1 + VFB = 1.23V R2 = 1K ~ 3K (3) Delay Start Circuit R2 FB 12V DC Input Vin Cin Capacitor CDELAY 0.1uF 4 1 5 SD RDELAY 10K AP1507 3 2 R1 R2 ) R1 Output L1 47uH 5V/ 3A Output Load Gnd D1 Schottky Diode Co Capacitor Anachip Corp. www.anachip.com.tw 7/9 Rev.1.1 Oct 29, 2004 AP1507 150KHz, 3A 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 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 a minimum. Feedback (FB) Senses the regulated output voltage to complete the feedback loop. 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 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. 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 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. Anachip Corp. www.anachip.com.tw 8/9 Rev.1.1 Oct 29, 2004 AP1507 150KHz, 3A PWM Buck DC/DC Converter Marking Information TO252-5L (Top view) Part Number Output Type: Blank: Adjustable 33: 3.3V 50: 5.0V 12: 12V 1507 - XX XX XX XX Logo Blank: normal L: Lead Free Package ID Code Xth Week: 01~52 Year: "01" = 2001 "02" = 2002 ~ Package Information Package Type: TO252-5L A B 5.6 5.6 C 11.0 M D 2.0 7.2 1.27 0.6 L P(TYP.) S G Land Pattern Recommendation (Unit: mm) K Symbol A B C D P S G H J K L M Dimensions In Millimeters Min. Nom. Max. 6.35 6.60 6.85 5.20 5.35 5.50 6.80 7.00 7.20 2.20 2.50 2.80 1.27 REF. 0.50 0.65 0.80 0.40 0.50 0.60 2.20 2.30 2.40 0.46 0.52 0.58 0.00 0.08 0.15 0.90 1.20 1.50 5.40 5.50 5.59 Dimensions In Inches Min. Nom. Max. 0.250 0.260 0.270 0.205 0.211 0.217 0.268 0.276 0.283 0.087 0.098 0.110 0.050 REF. 0.020 0.026 0.031 0.016 0.020 0.024 0.087 0.091 0.094 0.018 0.020 0.023 0.000 0.003 0.006 0.035 0.047 0.059 0.213 0.216 0.220 Anachip Corp. www.anachip.com.tw 9/9 J H Rev.1.1 Oct 29, 2004 |
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