UNISONIC TECHNOLOGIES CO., LTD P3576 LINEAR INTEGRATED CIRCUIT 50KHz, 2A PWM BUCK DC/DC CONVERTER DESCRIPTION The UTC P3576 series is a step-down switching regulator which is able to provide 2A output current. The available versions of output voltage are 2.5V, 3.3V, 5V, 12V and adjustable. FEATURES * Output load current: 2A * Adjustable version output voltage range, 1.23V ~ 38.5V±4% * Operating voltage can be up to 40V * Low power standby mode * High efficiency * Internal current and thermal limit * Built-in Switching Transistor On Chip. ORDERING INFORMATION Ordering Number Lead Free Halogen Free P3576L-xx-S08-R P3576G-xx-S08-R P3576L-xx-S08-T P3576G-xx-S08-T www.unisonic.com.tw Copyright © 2012 Unisonic Technologies Co., Ltd Package Packing SOP-8 SOP-8 Tape Reel Tube 1 of 6 QW-R103-054.E P3576 LINEAR INTEGRATED CIRCUIT MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING 15 :1.5V SOP-8 28 :2.8V AD:ADJ PIN CONFIGURATION VCC 1 8 VSS SW 2 7 VSS FB 3 6 VSS EN 4 5 VSS PIN DESCRIPTION PIN NO. 1 2 3 4 5~8 PIN NAME VCC SW FB EN VSS DESCRIPTION Operating voltage input Switching output Output voltage feedback control ON/OFF Shutdown GND pin UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-054.E P3576 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM EN 200mV VCC 220mV Current Source Bias 1.235V Reference 2.5V Regulator Start Up 50kHZ OSC. FB + COMP. Current Limit COMP. + R2 + AMP COMP. + COMP. - Control + Driver 2A Switch R1 SW Thermal Shutdown VSS ADJ : R2=0Ω, R1=OPEN UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R103-054.E P3576 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified ) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC +45 V ON/OFF Pin Input Voltage VEN -0.3 ~ 40 V Feedback Pin Voltage VFB -0.3 ~ 12 V Output Voltage to Ground VOUT -0.8 V Operating Supply Voltage VOP +4.5 ~ +40 V Power Dissipation PD Internally Limited W Junction Temperature TJ +125 °C Storage Temperature TSTG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient θJA 60 °С/W Junction to Case θJC 20 °С/W Note: θJA is measured with the PCB copper area(need connect to SW pins) of approximately 1.5 in2(Multi-layer). ELECTRICAL CHARACTERISTICS (TA=25°C, unless otherwise specified, VCC=12V for 3.3V, 5V, adjustable version and VCC=18V for the 12V version. ILOAD=0.2A.) PARAMETER Quiescent Current Feedback Bias Current ADJ Shutdown Supply Current Oscillator Frequency ADJ Oscillator Frequency of Short Circuit Protect Fixed MAX Duty Cycle MIN SYMBOL TEST CONDITIONS MIN TYP MAX IQ VFB=12V force driver off 4 8 IFB VFB=1.3V -10 -50 ISD EN pin=5V, VCC=40V 100 200 fOSC 44 50 56 25 VFB<0.5V fSCP VOUT <VOUT*40% 25 DC VFB=0V force driver ON 100 DC VFB=12V force driver OFF 0 Pear current, No outside circuit 2.5 Current Limit ICL VFB=0V force driver on Load Regulation(ΔVOUT /VOUT) ΔVOUT IOUT=0.2 ~ 2A 0.6 1.2 IOUT=2A, No outside circuit 1.2 1.4 Saturation Voltage VSAT VFB=0V force driver on -200 No outside circuit VFB=12V force driver off SW pin Leakage SW pin=0V ISWL Current SW pin=-0.8V VCC=40V force driver off -5 Low VIL regulator ON 1.3 0.6 EN pin Logic Input Threshold Voltage High VIH regulator OFF 2.0 1.3 EN pin Logic Input Current IH VEN=2.5V (OFF) -0.1 -10 EN pin Input Current IL VEN=0.5V (ON) -0.01 -1 Thermal shutdown Temp TSD 135 ADJ ILOAD=0.2A, VOUT programmed for 3.3V 1.193 1.23 1.267 3.3V ILOAD=0.2A 3.20 3.30 3.40 Output Feedback Voltage VFB 5.0V ILOAD=0.2A 4.85 5.00 5.15 12V ILOAD=0.2A 11.64 12.0 12.36 ADJ VCC=12V, ILOAD=2A 79 3.3V VCC=12V, ILOAD=2A 80 Efficiency η 5.0V VCC=12V, ILOAD=2A 84 12V VCC=15V, ILOAD=2A 90 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw UNIT mA nA μA KHz KHz KHz % % A % V μA mA V V μA μA °C V % 4 of 6 QW-R103-054.E P3576 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT VIN=12V L1 1 47μH U1 1 2 C2 0.1μF C1 470μF 3 4 VOUT=5.0V/2A 2 VCC VSS 8 SW VSS 7 FB VSS 6 EN VSS 5 R1 4.7K D1 3A/40V C3 470μF C6 0.1μF R2 1.5K UTC P3576 (1) Adjustable Output Voltage Version VIN=12V L1 1 33μH U1 1 2 C1 470μF C2 0.1μF C4 0.1μF 3 4 R3 100K VOUT=2.5V/2A 2 VCC VSS 8 SW VSS 7 6 FB VSS EN VSS 5 R1 1.8K D1 2A/40V C3 470μF C6 0.1μF R2 1.8K UTC P3576 ON/OFF (2) Adjustable Output Voltage Version With Delayed Startup VOUT=VFB×(1+R1/R2), VFB=1.23V, R2=0.47K ~ 3K Table 1 Resistor select for output voltage setting VOUT R2 1.5K 5V 1.8K 1.5K 3.3V 1.8K 2.5V 1.8K 1.8V 1.8K VOUT VIN=12V VIN=24V 2.5V 33μH 33μH L1 recommend value (IOUT=2A) 3.3V 33μH 33μH UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw R1 4.7K 5.6K 2.5K 3.0K 1.8K 0.82K 5V 47μH 47μH 12V NA 68μH 5 of 6 QW-R103-054.E P3576 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT (Cont.) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R103-054.E