UNISONIC TECHNOLOGIES CO., LTD

Transcription

1 UNISONIC TECHNOLOGIES CO., LTD 50KHz, 2A PWM BUCK DC/DC CONVERTER DESCRIPTION The UTC P3576 series is a stepdown switching regulator which is able to provide 2A output current. The available versions of output voltage are 2.5V, 3.3V, 5V, 2V and adjustable. FEATURES * Output load current: 2A * Adjustable version output voltage range,.23v ~ 38.5V±4% * Operating voltage can be up to 40V * Low power standby mode * High efficiency * Internal current and thermal limit * Builtin Switching Transistor On Chip. ORDERING INFORMATION Ordering Number Package Packing P3576GxxS08R SOP8 Tape Reel Note: xx: Output Voltage, Refer to Marking Information of 6 Copyright 204 Unisonic Technologies Co., Ltd

2 MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING SOP8 5 :.5V 33 : 3.3V 50 : 5.0V AD: ADJ PIN CONFIGURATION PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION Operating voltage input 2 Switching output 3 Output voltage feedback control 4 ON/OFF Shutdown 5~8 GND pin UNISONIC TECHNOLOGIES CO., LTD 2 of 6

3 BLOCK DIAGRAM 200mV Current Source Bias.235V Reference 2.5V Regulator Start Up 220mV 50kH Z OSC. Current Limit R2 AMP Control Driver 2A Switch R ADJ : R2=0Ω, R=OP Thermal Shutdown UNISONIC TECHNOLOGIES CO., LTD 3 of 6

4 ABSOLUTE MAXIMUM RATING (T A =25 C, unless otherwise specified ) PARAMETER SYMBOL RATINGS UNIT Supply Voltage 45 V ON/OFF Pin Input Voltage V 0.3 ~ 40 V Feedback Pin Voltage V 0.3 ~ 2 V Output Voltage to Ground V OUT 0.8 V Operating Supply Voltage V OP 4.5 ~ 40 V Power Dissipation P D Internally Limited W Junction Temperature T J 25 C Operating Temperature T OPR 40~25 C Storage Temperature T STG 65 ~ 50 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 θ JA 60 С/W Junction to Case θ JC 20 С/W Note: θ JA is measured with the PCB copper area(need connect to pins) of approximately.5 in 2 (Multilayer). ELECTRICAL CHARACTERISTICS (T A =25 C, unless otherwise specified, =2V for 3.3V, 5V, adjustable version and =8V for the 2V version. I LOAD =0.2A.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Quiescent Current I Q V =2V force driver off 4 8 ma Feedback Bias Current ADJ I V =.3V 0 50 na Shutdown Supply Current I SD pin=5v, =40V μa Oscillator Frequency f OSC KHz Oscillator Frequency of ADJ V <0.5V 25 KHz f SCP Short Circuit Protect Fixed V OUT <V OUT *40% 25 KHz Duty Cycle MAX DC V =0V force driver ON 00 % MIN DC V =2V force driver OFF 0 % Current Limit I CL Pear current, No outside circuit V =0V force driver on 2.5 A Load Regulation( V OUT /V OUT ) V OUT I OUT =0.2 ~ 2A % Saturation Voltage V SAT I OUT =2A, No outside circuit V =0V force driver on.2.4 V pin Leakage pin=0v No outside circuit V =2V force driver off 200 μa I L Current pin=0.8v =40V force driver off 5 ma pin Logic Input Threshold Voltage Low V IL regulator ON V High V IH regulator OFF V pin Logic Input Current I H V =2.5V (OFF) 0. 0 μa pin Input Current I L V =0.5V (ON) 0.0 μa Thermal shutdown Temp TSD 35 C ADJ I LOAD =0.2A, V OUT programmed for 3.3V Output Feedback Voltage 3.3V I LOAD =0.2A V 5.0V I LOAD =0.2A V 2V I LOAD =0.2A ADJ =2V, I LOAD =2A 79 Efficiency 3.3V =2V, I LOAD =2A 80 η 5.0V =2V, I LOAD =2A 84 % 2V =5V, I LOAD =2A 90 UNISONIC TECHNOLOGIES CO., LTD 4 of 6

5 TYPICAL APPLICATION CIRCUIT V IN =2V U 8 L 2 47μH V OUT =5.0V/2A R 4.7K C C D 3A/40V C 3 C 6 R 2.5K UTC P3576 () Adjustable Output Voltage Version V IN =2V U 8 L 2 33μH V OUT =2.5V/2A R.8K C C 2 C D 2A/40V C 3 C 6 R 2.8K R 3 00K UTC P3576 ON/OFF (2) Adjustable Output Voltage Version With Delayed Startup V OUT =V (R /R 2 ), V =.23V, R 2 =0.47K ~ 3K Table Resistor select for output voltage setting V OUT R2 R 5V.5K 4.7K.8K 5.6K 3.3V.5K 2.5K.8K 3.0K 2.5V.8K.8K.8V.8K 0.82K L recommend value (I OUT =2A) V OUT 2.5V 3.3V 5V 2V V IN =2V 33μH 33μH 47μH NA V IN =24V 33μH 33μH 47μH 68μH UNISONIC TECHNOLOGIES CO., LTD 5 of 6

6 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 6 of 6