LM3753 Datasheet, PDF (1/49 Pages) National Semiconductor (TI) – Scalable 2-Phase Synchronous Buck Controllers with Integrated FET Drivers and Linear Regulator Controller

LM3753
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SNVS614B – DECEMBER 2009 – REVISED MARCH 2013
LM3753 Scalable 2-Phase Synchronous Buck Controller with Integrated FET Drivers and
Linear Regulator Controller
Check for Samples: LM3753
FEATURES
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•2 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 kHz 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
• Dedicated Tracking Function
• 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
• Telecom/Datacom DC/DC Converters
• Desktops, Servers and Workstations
DESCRIPTION
Not Recommended for New Designs — See
LM3754
The LM3753 is a full featured single-output dual-
phase voltage-mode synchronous PWM buck
controller. It can be configured to control from 2 to 12
interleaved power stages creating a single high power
output. This controller utilizes voltage-mode control
with input voltage feed-forward 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, so the
output is controlled both up and down. This allows the
output voltage to follow a system supply through the
use of the TRACK pin. Available in the 5 mm x 5 mm
thermally enhanced 32-lead WQFN package with a
thermal pad.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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