LM2642MTC

TEXAS INSTRUMENTS  LM2642MTC  直流/直流控制器, 2相, 4.5V至30V, 2路输出, 同步降压, 340kHz, TSSOP-28

The is a 2-phase emulated two current-mode synchronous Buck Controller with a switching frequency of 300kHz. It operates 180° out of phase. This feature reduces the input ripple RMS current, there by 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 bootstrap circuitry. Current-mode feedback control assures excellent line and load regulation and a wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external current-sense resistor connected in series with the drain of the top FET. Current limit is independently adjustable for each channel.

.

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

.

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

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.