Two-Phase Synchronous Step-Down Switching Controller

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 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.
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM26420XSQX/NOPB Texas Instruments Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 16-WQFN -40 to 125
LM2642MTCX Texas Instruments 4.5-30V, Two-Phase Peak Current Mode Synchronous Buck Controller 28-TSSOP -40 to 125
LM26420YSQX/NOPB Texas Instruments Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 16-WQFN -40 to 125
LM26420YMH/NOPB Texas Instruments Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 20-HTSSOP -40 to 125
LM26420YMHX/NOPB Texas Instruments Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 20-HTSSOP -40 to 125
LM2642MTCX/NOPB Texas Instruments 4.5-30V, Two-Phase Peak Current Mode Synchronous Buck Controller 28-TSSOP -40 to 125
LM26420Q1XMH/NOPB Texas Instruments Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 20-HTSSOP -40 to 125
LM2642MTC/NOPB Texas Instruments 4.5-30V, Two-Phase Peak Current Mode Synchronous Buck Controller 28-TSSOP -40 to 125
LM26420YSQ/NOPB Texas Instruments Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 16-WQFN -40 to 125
LM26420XMHX/NOPB Texas Instruments Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 20-HTSSOP -40 to 125
LM2642 's PackagesLM2642 's pdf datasheet
LM2642MTC TSSOP
LM2642MTCX TSSOP




LM2642 Pinout, Pinouts
LM2642 pinout,Pin out
This is one package pinout of LM2642,If you need more pinouts please download LM2642's pdf datasheet.

LM2642 Application circuits
LM2642 circuits
This is one application circuit of LM2642,If you need more circuits,please download LM2642's pdf datasheet.


Related Electronics Part Number

Related Keywords:

LM2642 Pb-Free LM2642 Cross Reference LM2642 Schematic LM2642 Distributor
LM2642 Application Notes LM2642 RoHS LM2642 Circuits LM2642 footprint