The LM5642MTC is a current-mode Buck Controller with oscillator synchronization. It consists of two current-mode synchronous buck regulator controllers operating 180° out of phase with each other at a normal switching frequency of 200kHz. Out of phase operation reduces the input RMS ripple current, thereby significantly reducing the required input capacitance. The switching frequency can be synchronized to an external clock between 150 and 250kHz. 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 1.3V to 90% of Vin. An internal 5V rail is also available externally for driving bootstrap circuitry. Current-mode feedback control assures excellent line and load regulation and wide loop bandwidth for excellent response to fast load transients.
● Two synchronous buck regulators
● 180° Out-of-phase operation
● 50µA Shutdown current
● 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
● 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
● Green product and no Sb/Br
●Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
