AX3011 Datasheet | AXElite

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 e into standby mode. The internal pensation 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  BLOCK DIAGRAM V CC CURRENT SOURCE BIAS 1.25V REFERENCE 2.5V REGULATOR START-UP P. + P. + _ OCSET _ 1.155V 50k Hz OSC. Current limit P. SENSE + AMP _ P. + P. CONTROL + DRIVER Thermal Shutdown  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...