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 V_IN• 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.

The LM2642 features analog soft-start circuitry that is independent of the output load and output capacitance. This makes the soft-start behavior more predictable and controllable than traditional soft-start circuits.

A PGOOD1 pin is provided to monitor the dc output of channel 1. Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event.

• 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.
• 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

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• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 30
• Vout (Min) (V)
• 1.238
• Vout (Max) (V)
• 27
• Iout (Max) (A)
• 6
• Iq (Typ) (uA)
• 1000
• Switching frequency (Min) (kHz)
• 300
• Switching frequency (Max) (kHz)
• 300
• Features
• Adjustable Current Limit, Enable, Phase Interleaving, Power Good, Synchronous Rectification
• Regulated outputs (#)
• 2
• Number of phases
• 2
• Rating
• Catalog

LM2642的完整型号有：LM2642MTC/NOPB、LM2642MTCX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM2642MTC/NOPB，工作温度：-40 to 125，封装：TSSOP (PW)-28，包装数量MPQ：48个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM2642MTC/NOPB的批量USD价格：1.718（1000+）

LM2642MTCX/NOPB，工作温度：-40 to 125，封装：TSSOP (PW)-28，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM2642MTCX/NOPB的批量USD价格：1.432（1000+）

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