LM3753 Datasheet | National Semiconductor

Description The LM3753 and LM3754 are full featured single-output dualphase voltage-mode synchronous PWM buck controllers. They can be configured to control from 2 to 12 interleaved power stages creating a single high power output. Both controllers utilize voltage-mode control with input voltage feedforward for high noise immunity. An internal average current loop forces real time current sharing between phases during load transients. The LM3753 supports a Tracking function, while the LM3754 supports adjustable Soft-Start. The LM3753 Tracking is always enabled, so the output is controlled both up and down. The Soft-Start function on the LM3754 can only drive the output upwards - it will not pull it down, therefore, pre-biased loads will not be discharged. Available in the 5 mm x 5 mm thermally enhanced 32-lead LLP package with a thermal pad. Features - Wide input voltage range of 4.5V to 18V - Up to 12 channels for 300A load - System accuracy better than 1% - 0.6V to 3.6V output voltage range - Switching frequency from 200 k Hz to 1 MHz - Phase current sharing ±12% max over temperature - Integrated 4.35V ±2.3% LDO - Inductor DCR or sense resistor current sensing - Interleaved switching for low I/O ripple current - Integrated synchronous NFET drivers - Programmable Soft-Start (LM3754) or Tracking (LM3753) - Pre-biased startup (LM3754) - Output voltage differential remote sensing - Minimum controllable on-time of only 50 ns - Programmable Enable and input UVLO - Power Good flag - OVP, UVP and hiccup over-current protection Applications - CPUs, GPUs (graphic cards), ASICs, FPGAs, Large Memory Arrays, DDR - High Current POL Converters - Networking Systems - Power Distribution Systems - Tele/Data DC/DC Converters - Desktops, Servers and Workstations Simplified Application © 2009 National Semiconductor Corporation 300919 .national. LM3753/54 Connection Diagram Ordering Information Order Number LM3753SQ LM3753SQX LM3754SQ LM3754SQX TRACK/SS function TRACK...