LM2642MTCX

• Two synchronous step-down regulators
• 180° out-of-phase operation
• 4.5V to 30V input range
• Chapter 1 The power monitoring function is good
• 37μA shutdown current
• 0.04% (typical) line and load regulation error
• With or without detection resistive current mode control
• Separate enable/soft-start pins allow for simple sequential start configuration.
• Configurable to operate in parallel with a single output. (see).
• Adjustable cycle-by-cycle current limit
• Enter the undervoltage lock
• Output overvoltage latching protection
• Output undervoltage protection and delay
• Thermal shutdown
• When the self-discharge regulator of the output capacitor is turned off,
• TSSOP package

illustrate

The LM2642 is synchronized with two current modes with a frequency of 300kHz and a regulated controller.

Two switching regulator controllers operate 180° out of phase. This feature reduces the input ripple RMS current, which greatly reduces the input capacitance required. The two switching regulator outputs can also be connected in parallel to act as a two-phase single-output regulator.

Each channel output can be independently adjusted from 1.3 to V IN • maximum duty cycle. An internal 5V power supply can also be used to drive an external bootstrap circuit.

Current-mode feedback control guarantees excellent line and load regulation and excellent fast load transient response wide loop bandwidth. Both on the current top or on the FET Vds an external current sense resistor connected in series to the top FET drain induction. The current limit is independently adjustable for each channel.

The LM2642 soft-start circuit with analog function, it is independent of the output load and output capacitance. This makes the soft-start behavior more predictable than traditional soft-start circuit control.

The PGOOD1 pin is used to monitor the channel 1 DC output. Overvoltage protection is available for both outputs. A UV delay pin also allows the IC time of the undervoltage event to be output during delay shutdown.

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