AP1515

AP1515 150KHz, 1.5A PWM Buck DC/DC Converter Features - Output voltage: 3.3V 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 - Operating voltage can be up to 22V - Output load current: 1.5A - SIP-4L Pb-Free package - Low power standby mode - Built-in switching transistor on chip - Very Low Cost General Description The AP1515 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 1.5A load without additional transistor component. 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 AP1515 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 and an adjustable type. The packages are available in a standard 4-lead SIP-4L package. Applications - Simple High-efficiency step-down regulator - On-card switching regulators - Positive to negative converter Pin Assignments (Front View) 1 : VIN 2 : Output 3 : FB 12 3 4 4 : GND Pin Descriptions Name VIN Output FB GND Description Operating voltage input Switching output Output voltage feedback control Ground 1515 SIP-4L 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.1.0 Oct 29, 2004 1/6 AP1515 150KHz, 1.5A PWM Buck DC/DC Converter Ordering Information AP1515 XX X Output version Blank : Adjustable -33 : 3.3V Package P: SIP-4L (Bulk) Block Diagram VIN 200mV Current Source bias 1.235V Reference 2.5V Regulator Start up 220mV + Comp _ Comp + FB Comp + Anachip Corp. www.anachip.com.tw 2/6 _ + Amp _ Frequecy compensation Pre-driver 150kHz OSC. Thermal Shutdown _ 1.5A Switch Output Gnd Rev.1.0 Oct 29, 2004 AP1515 150KHz, 1.5A 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 IL IQ ISTBY θJC θJA Parameter Feedback bias current Oscillator frequency Conditions VFB=1.3V (Adjustable version only) Min. 127 110 5 2 Typ. 1.23 78 3.3 80 Typ. -10 150 15 1.25 100 0 -5 5 70 30 100 Max. -50 -100 173 173 25 1.4 1.5 -200 10 150 200 Limit Unit nA KHz KHz V % A uA mA mA uA o o of When current limit occurred and VFB < 0.5V, Ta=25 oC IOUT=2A 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 = 0 leakage VFB=12V force driver off VIN=22V Output = -1 current Quiescent Current VFB=12V force driver off Standby Quiescent ON/OFF pin=5V Current VIN=22V Thermal Resistance Junction to case Note 1 Junction to ambient Symbol VFB η Oscillator frequency short circuit protect C/W C/W Part Number AP1515-ADJ Parameter Output Feedback Efficiency Output voltage Efficiency Conditions 4.5V < VIN < 22V 0.2A < ILOAD < 1.5A VOUT programmed for 3V VIN = 12V, ILOAD=1.5A 4.75V < VIN < 22V 0.2A < ILOAD < 1.5A VIN = 12V, ILOAD=1.5A 1.193/1.18 1.267/1.28 3.168/3.135 3.432/3.465 AP1515-3.3V VOUT η Unit V VMIN VMAX % V VMIN VMAX % Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC. Note 1: Pin 4(GND) (< 1 mm length) & direct connect to internal GND layer. Anachip Corp. www.anachip.com.tw Rev.1.0 Oct 29, 2004 3/6 AP1515 150KHz, 1.5A PWM Buck DC/DC Converter Typical Application Circuit (1) Fixed Type Circuit 12V DC Input Vin Cin Capacitor 1 FB 3 AP1515 -33 4 GND Output L1 56uH Inductor D1 Schottky Diode Co Capacitor 3.3V/1.5A Output Load 2 (2) Adjustable Type Circuit R2 12V DC Input Vin Cin Capacitor 1 FB 3 R1 L1 47uH Inductor D1 Schottky Diode Co Capacitor 2.5V/1.5A Output Load AP1515 4 GND 2 Output Vout = VFB × (1 + VFB = 1.23V R2 = 1K ~ 3K R1 R2 ) Typical Performance Characteristics AP1515 Output Voltage v.s. Temperature (Vin=12V ,Io=1.5A) 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 AP1515 Efficiency v.s. Temperature (Vin=12V,Vout=3.3V,Io=1.5A) 82 81 80 Efficiency (%) Vout (V) 79 78 77 76 75 74 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) 0 20 40 60 80 100 120 140 160 Temperature (TA) (°C) Anachip Corp. www.anachip.com.tw Rev.1.0 Oct 29, 2004 4/6 AP1515 150KHz, 1.5A PWM Buck DC/DC Converter Typical Performance Characteristics (Continued) AP1515 Saturation Voltage v.s. Temperature (Vcc=12V,Vfb=0V,VSD=0) 1.4 1.3 AP1515 Switch Current Limit v.s. Temperature (Vcc=12V,Vfb=0V) 3.5 Saturation Voltage (V) 1.2 1.1 1 0.9 0.8 0.7 -50 -25 0 25 50 75 100 125 1A 0.5A 1.5A Switch Current Limit (A) 3 2.5 2 -50 -30 -10 10 30 50 70 90 Temperature (TA)　(°C) Temperature (TA) (°C) AP1515 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) AP1515 Frequency v.s. Temperature (Vcc=12V , Io=500mA ,Vout=5V) 170 AP1515 Feedback Current v.s. Temperature (Vcc=12V , Vout=5V,Vfb=1.3V) 10 Frequency (KHz) 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 Temperature (TA) (°C) Temperature (TA) (°C) Anachip Corp. www.anachip.com.tw Rev.1.0 Oct 29, 2004 5/6 AP1515 150KHz, 1.5A 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 Senses the regulated output voltage to complete the feedback loop. Marking Information SIP-4L ( Top View ) ( Top View ) Part Number: AP1515 Output Type: Adjustable Date Code X: Internal code WW: Nth week: 01~52 Y: Year: "1" = 2001 "2" = 2002 1515 Y WW X 15-33 Y WW X Part Number : AP1515 -33: Output Type: 3.3V Date Code X: Internal code WW: Nth week: 01~52 Y: Year: "1" = 2001 "2" = 2002 Package Information Package Type: SIP-4L 5 -7 1.55mm +/-0.1mm 1.03mm +/-0.1 0.30mm +/-0.1mm 3 -5 o o o o 14.25mm +/-1.25mm 0.38mm +/-0.03mm 3.65mm +/-0.1mm 0.46mm +/-0.03mm 0.41mm +/-0.03mm 3.81mm +/-0.03mm 5 -7 o o 3 -5 o o 5.22mm +/-0.1mm 4.20mm +/-0.1mm 0.2mm Max. 1.42mm+/-0.1mm 1.27mm +/-0.03mm Anachip Corp. www.anachip.com.tw Rev.1.0 Oct 29, 2004 6/6