AP1515 150KHz, 1.5A PWM Buck DC/DC Converter Features General Description - 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 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 Pin Descriptions Name (Front View) 1515 VIN 1 : VIN Output 2 : Output FB 3 : FB 1 2 3 4 GND 4 : GND Description Operating voltage input Switching output Output voltage feedback control Ground 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 Package Blank : Adjustable -33 : 3.3V P: SIP-4L (Bulk) Block Diagram VIN 200mV Current Source bias 1.235V Reference 2.5V Regulator 220mV Start up + Comp _ _ Comp + Frequecy compensation _ FB + Amp _ Comp + Pre-driver 1.5A Switch Output 150kHz OSC. Anachip Corp. www.anachip.com.tw Thermal Shutdown Gnd Rev.1.0 Oct 29, 2004 2/6 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 Parameter Feedback bias current FOSC Oscillator frequency FSCP Oscillator frequency short circuit protect VSAT DC ICL IL IQ ISTBY θJC θJA Conditions VFB=1.3V (Adjustable version only) 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 Part Number AP1515-ADJ AP1515-3.3V Symbol Parameter VFB Output Feedback η Efficiency VOUT η Conditions 4.5V < VIN < 22V 0.2A < ILOAD < 1.5A VOUT programmed for 3V VIN = 12V, ILOAD=1.5A Min. Typ. Unit 150 - Max. -50 -100 173 173 - -10 127 110 5 15 25 KHz - 1.25 - 100 0 - % 2 - - A - - -200 uA - -5 5 - 70 nA KHz 1.4 - 10 150 200 - 30 100 Typ. Limit 1.23 1.193/1.18 1.267/1.28 78 Output voltage 4.75V < VIN < 22V 0.2A < ILOAD < 1.5A 3.3 Efficiency VIN = 12V, ILOAD=1.5A 80 V 1.5 3.168/3.135 3.432/3.465 mA mA uA o o C/W C/W 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 FB 12V DC Input Vin 1 3 AP1515 -33 Output 2 Inductor 4 Cin Capacitor 3.3V/1.5A Output Load L1 56uH D1 Schottky Diode GND Co Capacitor (2) Adjustable Type Circuit R2 R1 FB 12V DC Input L1 47uH 3 Vin 1 AP1515 Output 2 Inductor 4 D1 Schottky Diode GND Cin Capacitor Vout = VFB × (1 + 2.5V/1.5A Output Load R1 R2 Co Capacitor ) VFB = 1.23V R2 = 1K ~ 3K Typical Performance Characteristics AP1515 Efficiency v.s. Temperature (Vin=12V,Vout=3.3V,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 82 81 80 Efficiency (%) Vout (V) AP1515 Output Voltage v.s. Temperature (Vin=12V ,Io=1.5A) 79 78 77 76 75 74 -40 -20 0 20 40 60 -50 -30 -10 10 80 100 120 140 160 Temperature (TA) (°C) 30 50 70 90 110 130 150 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) AP1515 Switch Current Limit v.s. Temperature (Vcc=12V,Vfb=0V) 1.4 Switch Current Limit (A) 3.5 Saturation Voltage (V) 1.3 1.2 1.1 1.5A 1A 1 0.5A 0.9 0.8 0.7 -50 -25 0 25 50 75 100 3 2.5 2 -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) AP1515 Supply Current v.s. 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 55 50 45 Switch OFF 40 35 30 -50 -30 -10 10 50 70 90 110 130 150 Temperature (TA) (°C) Temperature (TA) (°C) AP1515 Frequency v.s. Temperature (Vcc=12V , Io=500mA ,Vout=5V) AP1515 Feedback Current v.s. Temperature (Vcc=12V , Vout=5V,Vfb=1.3V) 170 10 Feedback Current (nA) 165 Frequency (KHz) 30 160 155 150 145 140 0 -10 -20 -30 -40 -50 -50 -30 -10 10 30 50 70 90 110 130 150 -50 -30 -10 10 Temperature (TA) (°C) 30 50 70 90 110 130 150 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. 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. Ground Circuit ground. Feedback Senses the regulated output voltage to complete the feedback loop. Marking Information SIP-4L ( Top View ) ( Top View ) 1515 Y WW X 15-33 Y WW X Part Number: AP1515 Output Type: Adjustable Date Code X: Internal code WW: Nth week: 01~52 Y: Year: "1" = 2001 "2" = 2002 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 o 5 -7 o 14.25mm +/-1.25mm 1.55mm +/-0.1mm 1.03mm +/-0.1 o 3 -5 0.38mm +/-0.03mm o 3.65mm +/-0.1mm o 5 -7 o o 3 -5 0.41mm +/-0.03mm 3.81mm +/-0.03mm 0.46mm +/-0.03mm 5.22mm +/-0.1mm 4.20mm +/-0.1mm 0.30mm +/-0.1mm o 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