LM3753SQX

• Wide input voltage range of 4.5V to 18V
• 12 channels with 300A load
• System accuracy better than 1%
• Output voltage range from 0.6V to 3.6V
• Switching frequency from 200 kHz to 1 MHz
• Phase current sharing± 12% maximum over temperature
• Combined 4.35V ± 2.3% LDO
• Inductor DCR or inductive resistor current sensing
• Interleaved switching of ripple currents with low I/O
• Integrated synchronous NFET driver
• Programmable Soft-Start (LM3754) or Tracking (LM3753)
• Prebias Start-Up (LM3754)
• Remote sensing of output voltage difference
• The minimum controllable time is only 50 nanoseconds
• Programmable enable and input UVLO
• Power good flag
• OVP, UVP and Hiccup overcurrent protection

illustrate

The LM3753 and LM3754 are full-featured dual-phase single-output voltage mode synchronous PWM buck controllers. They can be configured to establish a single high power output control from 2 to 12 interleaved power stages. Both controllers use feed-forward mode control with high noise immunity with input voltage. Internal current loop averages real-time current sharing during load transients between phases.

The LM3753 supports the tracking function, while the LM3754 supports adjustable soft-start. LM3753 tracing is always enabled, allowing control of the output up and down. The LM3754 with soft-start function can only go up to the output of the driver - it does not pull down, therefore, the prebiased load cannot be discharged in time. Thermally enhanced 32-pin LLP package in a 5mm x 5mm thermal pad.

apply

• CPUs, GPUs (graphics cards), structured ASICs, FPGAs, mass memory arrays, disarmament, demobilization and reintegration
• High current POL converter
• Network systems
• Power distribution system
• Telecom/Datacom DC/DC converters
• Desktops, servers and workstations