LM2642

LM2642 www.ti.com SNVS203I – MAY 2002 – REVISED APRIL 2013 LM2642 Two-Phase Synchronous Step-Down Switching Controller Check for Samples: LM2642 FEATURES 1 2 Two Synchronous Buck Regulators 180° Out of Phase Operation 4.5V to 30V Input Range Power Good Function Monitors Ch.1 37µA Shutdown Current 0.04% (typical) Line and Load Regulation Error 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 3). 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 package APPLICATIONS Embedded Computer Systems High End Gaming Systems Set-top Boxes WebPAD DESCRIPTION The LM2642 consists of two current mode synchronous buck regulator controllers with a switching frequency of 300kHz. The two switching regulator controllers operate 180° out of phase. This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The two switching regulator outputs can also be paralleled to operate as a dual-phase single output regulator. The output of each channel can be independently adjusted from 1.3 to VIN maximum duty cycle. An internal 5V rail is also available externally for driving bootstr...