WWW.Microsemi .COM LX7104 LX7104 LX7104 1.4MHz 1.5A Asynchronous Buck Converter TM PRODUCTION DATASHEET DESCRIPTION KEY FEATURES Input Supply Range: 4.5V to 18V The LX7104 is a 1.4MHz fixed Soft-start is built in, and current mode Output Voltage Adjustable from frequency, current mode, PWM buck (step- control provides fast transient response and 0.81V to 15V down) DC-DC converter, capable of cycle-by-cycle current limit. Short circuit Integrated High-Side NMOS Switch driving a 1.5A load with high efficiency, protection will be triggered when current is Current Mode Control excellent line and load regulation. The over limit and FB is below 0.25V. Output Current: 1.5A device integrates a N-channel power The LX7104ISF is available in SOT23- Fixed 1.4MHz Frequency High Efficiency: Up To 92% MOSFET switch with low on-resistance. 6 package. Built-in Soft-start The converter accepts a wide input voltage Built-in OV, UV & OT Protection range from 4.5V to 18V, and provides an Cycle-by-cycle Over Current output voltage adjustable typically from Protection 0.81 to 15V. Short Circuit Protection RoHS Compliant & Halogen Free APPLICATIONS LCD TVs / Monitor DPF Portable DVD IMPORTANT: For the most current data, consult MICROSEMIs website: WWW.Microsemi .COM LX7104 LX7104 LX7104 1.4MHz 1.5A Asynchronous Buck Converter TM PRODUCTION DATASHEET AABSOLUTE MAXIMUM RATINGS PACKAGE PIN OUT IN (Input Pin) ......................................................................................................... -0.3V to 20V EN (Enable Pin) ............................................................................................ -0.3V to V +0.3V IN SW (Switch Pin) .................................................................................................................. 21V BS 1 6 SW BS (Bootstrap Pin) .......................................................................................... -0.3V to V +6V SW FB (Feedback Pin) ................................................................................................... -0.3V to 6V Maximum Junction Temperature ...................................................................................... 150C GND 2 5 IN Storage Temperature Range ............................................................................... -65 C to 150C Lead Temperature. (Soldering 10 seconds) ....................................................................... 260C 3 4 EN FB Notes: Exceeding these ratings could cause damage to the device. All voltages are with respect to GND. Currents are positive into, negative out of specified terminal. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under LX7104 Recommended Operating Conditions are not implied. Exposure to Absolute Maximum Ratings SF PACKAGE for extended periods may affect device reliability. (Top View) RoHS / Pb-free Matte Tin Pin Finish RECOMMENDED OPERATING CONDITIONS Parameters Symbol Min MaxUnits Input Voltage V 4.5 18 V IN Maximum Output Current I (MAX) 1.5 A OUT Operating Ambient Temperature T -40 85 C A ELECTRICAL CHARACTERISTICS V = V = 12V, V = 3.3V, T = 25C, unless otherwise specified. IN EN OUT A Parameters Symbol Test Conditions/Comments MIN TYP MAX Units Recommended Operating Range V V 4.5 18 V IN IN Operating Current Quiescent Current I V = 0.9V 0.8 1.0 mA Q FB Shutdown Supply Current I V = 0V 0.1 1 A SHDN EN V UVLO IN Under Voltage Lockout V V Rising 3.3 3.8 4.3 V UVLO IN UVLO Hysteresis V 200 mV HYS Feedback Voltage Feedback Voltage V -40C T 85C 0.785 0.810 0.835 FB A V Feedback Over Voltage V 0.972 FBOV Threshold FB Input Bias Current V = 0.85V -100 100 nA I FB FB Output 0.35 Switch R R I = 1.0A DSON DSON SW Switch Leakage Current I V = 18V, V = 0V 0.1 10 A LEAK IN EN Copyright 2011 Page 2 Microsemi Rev. 1.1 06-14-2011 Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570