LM3754_15 Datasheet, PDF (1/47 Pages) Texas Instruments – Scalable 2-Phase Synchronous Buck Controller with Integrated FET Drivers and Linear Regulator Controller

LM3754
www.ti.com
SNVS789B – JANUARY 2012 – REVISED APRIL 2013
LM3754 Scalable 2-Phase Synchronous Buck Controller with Integrated FET Drivers and
Linear Regulator Controller
Check for Samples: LM3754
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
• Programmable Soft-Start
• Pre-Biased Startup
• 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
The LM3754 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 LM3754 supports adjustable Soft-Start. The Soft-
Start function 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 WQFN package with a
thermal pad.
Simplified Application
V_IN
6V TO 18V DC
CIN
V_OUT
1.2V 100A
COUT
BOOT1
HG1
SW1
VDD
DBOOT1
CBOOT1
VDD
DBOOT3
VIN
QT1 _L1
QT3
L3
RDCR1 CDCR1 _{CDCR3 RDCR3}
CBOOT3
BOOT1
HG1
SW1
CS1
LG1
LM3754
CSM
BOOT2
HG2
SW2
DBOOT2
CBOOT2
QB1
QB3
VIN
VIN
QT2 _L2
QT4
L4
RDCR2 CDCR2 _{CDCR4 RDCR4}
DBOOT4
CBOOT4
CS1
LG1
LM3754
CSM
BOOT2
HG2
SW2
CS2
LG2
QB2
RILIM1
ILIM
CS2
QB4
LG2
RILIM2
ILIM
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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.
Copyright © 2012–2013, Texas Instruments Incorporated