LM5642

LM5642, LM5642X www.ti.com SNVS219K – JUNE 2003 – REVISED APRIL 2013 LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization Check for Samples: LM5642, LM5642X FEATURES 1 2 Two Synchronous Buck Regulators 180° Out of Phase Operation 200 kHz Fixed Nominal Frequency: LM5642 375 kHz Fixed Nominal Frequency: LM5642X Synchronizable Switching Frequency from 150 kHz to 250 kHz for the LM5642 and 200 kHz to 500 kHz for the LM5642X 4.5V to 36V Input Range 50 µA Shutdown Current Adjustable Output from 1.3V to 90% of Vin 0.04% (Typical) Line and Load Regulation Accuracy Current Mode Control with or without a Sense Resistor Independent Enable/Soft-start Pins Allow Simple Sequential Startup Configuration. Configurable for Single Output Parallel Operation. (See Figure 4) Adjustable Cycle-by-cycle Current Limit Input Under-voltage Lockout Output Over-voltage Latch Protection Output Under-voltage Protection with Delay Thermal Shutdown Self Discharge of Output Capacitors when the Regulator is OFF TSSOP and HTSSOP (Exposed PAD) Packages APPLICATIONS Embedded Computer Systems Navigation Systems Telecom Systems Set-Top Boxes WebPAD Point Of Load Power Architectures DESCRIPTION The LM5642 series consists of two current mode synchronous buck regulator controllers operating 180° out of phase with each other at a normal switching frequency of 200kHz for the LM5642 and at 375kHz for the LM5642X. Out of phase op...