DatasheetsPDF.com

AX3011 Dataheets PDF



Part Number AX3011
Manufacturers AXElite
Logo AXElite
Description 2A PWM Buck DC/DC Converter
Datasheet AX3011 DatasheetAX3011 Datasheet (PDF)

AX3011 50KHz, 2A PWM Buck DC/DC Converter  GENERAL DESCRIPTION The AX3011 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 2.5A 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 .

  AX3011   AX3011


Document
AX3011 50KHz, 2A PWM Buck DC/DC Converter  GENERAL DESCRIPTION The AX3011 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 2.5A 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; current limit is against over current operating of the output switch that set by outside resistance. If current limit function occurs and VFB is down below 0.3V, the switching frequency will be reduced to 10 KHz; and over voltage protection (OVP) that can avoid high VOUT voltage to damage circuit and capacitor. The chip is available in SOP-8L-EP package which features small size as SOP-8L with an Exposed Pad to reduce the junction-to-case resistance.  FEATURES Operating voltage can be up to 40V. Maximum adjustable output up to 38V. € Ñbvoltage y • R ` Typical switching frequency w is 50K Hz. m Û V om Voltage mode non-synchronous PWM converter. c . h c Thermal-shutdown and current-limit ote protection. .g Short Circuit Protect w(SCP). w wlimit setting. External current Over Voltage Protect (OVP) Sense and Output. Output load current: 2A. Low power standby mode. Built-in switching transistor on chip. SOP-8L-EP Pb-Free packages. of 1/10 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.4 Aug.04, 2010 AX3011  BLOCK DIAGRAM V CC CURRENT SOURCE BIAS 1.25V REFERENCE 2.5V REGULATOR START-UP COMP. OVP + COMP. + _ OCSET _ 1.155V 50kHz OSC. Current limit COMP. SENSE + AMP _ COMP. + COMP. CONTROL + DRIVER Thermal Shutdown FB COMP  PIN ASSIGNMENT The package of AX3011 is SOP-8L-EP; the pin assignment is given by: SW OVP SENSE FB 1 2 3 4 •yÑb€ Name R ` ( Top View )w m VCC VÛm o c h. OCSET Vcc 8 ec t o of 7 OCSET VSS g . w FB Vss ww 6 Vss 5 SOP-8L-EP COMP Description Operating voltage input Add an external resistor to set max switch output current GND pin Output voltage feedback control Switch pin. Connect external SW inductor and diode here. OVP OVP Output pin. COMP Compensation pin SENSE Over Voltage Sense Input  ORDER/MARKING INFORMATION Order Information AX3011 XX X Package Type Packing ES: EP-SOP-8L Blank : Tube A : Taping Logo 3 0 11 AX Y Y WW X Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.4 Aug.04, 2010 _ + 2.0A SWITCH _ SW Vss Top Marking Part number ID code:internal WW: 01~52 Year: 10=2010 11=2011 2/10 AX3011  ABSOLUTE MAXIMUM RATINGS Characteristics Maximum Supply Voltage COMP Pin Input Voltage Feedback Pin Voltage SENSE Pin Voltage OCSET Pin Input Voltage SW Pin Voltage OVP Pin Voltage Power Dissipation Internally limited Storage Temperature Range Operating Temperature Range Thermal Resistance from Junction to case Thermal Resistance from Junction to ambient Symbol VCC VCOMP VFB VSENSE VOCSET VSW VOVP PD TST TOP θJC θJA Rating +45 -0.3 to 6 -0.3 to 12 -0.3 to 12 -0.3 to Vcc -0.3 to VCC -0.3 to Vcc ( TJ-TA ) / θJA -65 to +150 -40 to +125 15 40 Unit V V V V V V V W °C °C °C/W °C/W Note: θJA is measured with the PCB copper area(need connect to Exposed Pad) of approximately 3 in2 (Multi-layer).  ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA=25°C, VCC=12V, VOUT=5V, ILOAD = 0.2A) Characteristics Symbol Conditions Min Typ Max Units •yÑb€ Operating Supply Voltage Feedback Voltage Feedback bias current Line Regulation Load Regulation Quiescent Current Oscillator frequency Oscillator frequency of short circuit protect Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Saturation voltage Sense Voltage DC w w`RVCC m Û V om c . ch VFB e t o of g . ww IFB VFB=1.5V 4.5 - 40 V V nA % % mA KHz KHz % V V 3/10 1.143 1.155 1.167 45 -10 0.1 0.1 3 50 10 100 0 1.0 0.2 0.2 6 55 1.2 VCC=10~40V IOUT=0~2A ICCQ VFB=2V force driver off FOSC FSCP VFB<0.3V VFB=0V force driver on VFB=12V force driver off VSAT IOUT=2A, No outside circuit VFB=0V force driver on VSENSE 1.205 1.23 1.255 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.4 Aug.04, 2010 AX3011  ELECTRICAL CHARACTERISTICS (CONTINUES) (Unless otherwise specified, TA=25°C, VCC=12V, VOUT=5V, ILOAD = 0.2A) OVP Voltage SW pin leakage current SW pin=0V SW pin leakage current SW pin=-0.8V Thermal shutdown Temp Thermal Shutdown Hysteresis  APPLICATION CIRCUIT VIN=12~40V U1 8 Vcc SW 7 OCSET Vss 3.9K 2 OVP FB 5 Comp SENSE R5 4.7K AX3011 1 6 4 3 1 L1 100uH D1 B340A C3 470uF C4 0.1uF 2 R1 5K C9 1nF R8 5K R6 5K R4 10K C7 R2 1.5K R7 1.5K 100uF C8 0.1uF Vout=5.0V/2A VOVP VSENSE=1.5V, IOVP=3mA ISWL TSD TSH No outside circuit VFB=2V force driver off VCC=40V force driver off - 0.35 0.5 -5 155 35 V -200 uA mA °C °C C1 C2 R3 220uF 0.1uF C5 47nF  Ñb€ R1 y • R ` V.


AX3525 AX3011 AX3010


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)