AX3005M5A

AX3005 150KHz, 3A PWM Buck DC/DC Converter GENERAL DESCRIPTION The AX3005 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 3A load without additional transistor. It saves board space. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having 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 occurs and VFB is down below 0.5V, the switching frequency will be reduced. The AX3005 series operates at a switching frequency of 150KHz thus allow smaller sized filter components than what would be needed with lower frequency switching regulators. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The chip is available in a 5-Lead TO263 package. FEATURES - Output voltage: 3.3V, 5V, 12V and adjustable output version. Adjustable version output voltage range, 1.23V to 38.5V. - 150KHz fixed switching frequency. Voltage mode non-synchronous PWM control. Thermal-shutdown and current-limit protection. ON/OFF shutdown control input. Short Circuit Protect (SCP). Operating voltage can be up to 40V. - Output load current: 3A. 5-Lead TO263 Pb-Free packages. - Low power standby mode. Built-in switching transistor on chip. 1/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.8 Nov.18, 2016 AX3005 BLOCK DIAGRAM EN 200mV V CC 220mV 1.235V CURRENT SOURCE BIAS REFERENCE START UP 2.5V REGULATOR + _ COMP. Current limit 150kHz OSC. _ FB COMP. + R2 + AMP _ + COMP. _ COMP. CONTROL + DRIVER 3A SWITCH R1 SW Thermal Shutdown Ω Vss ADJ : R2=0 , R1=OPEN PIN ASSIGNMENT The package of AX3005 is TO263-5L; the pin assignment is given by: TO263-5L ( Side View ) Name 5 EN 4 FB 3 VSS 2 SW 1 VCC Metal Tab GND ( Top View ) Description VCC Operating voltage input SW Switching output VSS GND pin FB Output voltage feedback control EN ON/OFF Shutdown 2/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.8 Nov.18, 2016 AX3005 ORDER/MARKING INFORMATION Order Information Top Marking ADJ FIX ABSOLUTE MAXIMUM RATINGS Characteristics Symbol Rating Unit Maximum Supply Voltage VCC +45 V ON/OFF Pin Input Voltage VEN -0.3 to 40 V Feedback Pin Voltage VFB -0.3 to 12 V Output Voltage to Ground VOUT -0.8 V Power Dissipation Internally limited PD ( TJ-TA ) / θJA W Storage Temperature Range TST -65 to +150 °C Operating Junction Temperature Range TJ -40 to +125 °C Operating Supply Voltage VOP +4.5 to +40 V Thermal Resistance from Junction to case θJC 3.5 °C/W Thermal Resistance from Junction to ambient θJA 25 °C/W Note: θJA is measured with the PCB copper area(need connect to VSS pins) of approximately 3 in2 (Multi-layer). 3/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.8 Nov.18, 2016 AX3005 ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA=25°C, VCC=12V for 3.3V, 5V, adjustable version and VCC=18V for the 12V version. ILOAD = 0.2A) Characteristics Symbol Conditions Min Typ Max Units Quiescent Current ICCQ VFB=12V force driver off VFB=1.3V Feedback bias current IFB (Adjustable version only) EN pin=5V Shutdown supply Current ISD V =40V CC Oscillator frequency FOSC 127 (Adjustable) When VFB