LM3754 Series

4.5-V to 18-V, scalable 2-phase synchronous buck controller with integrated FET drivers

Catalog

4.5-V to 18-V, scalable 2-phase synchronous buck controller with integrated FET drivers

Part	Function	Duty Cycle (Max) [Max]	Topology	Control Features	Number of Outputs	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Configuration	Clock Sync	Mounting Type	Output Phases	Operating Temperature [Min]	Operating Temperature [Max]	Synchronous Rectifier	Supplier Device Package	Output Type	Frequency - Switching [Max]	Frequency - Switching [Min]
Texas Instruments LM3754SQX/NOPB	Step-Down	81 %	Buck	Current Limit Enable Frequency Control Power Good Tracking	2	4.5 V	18 V	Positive		Surface Mount	2	-5 °C	125 ¯C		32-WQFN (5x5)	Transistor Driver	1 MHz	200 kHz

Catalog

4.5-V to 18-V, scalable 2-phase synchronous buck controller with integrated FET drivers

Key Features

• Wide Input Voltage Range of 4.5V to 18VUp to 12 Channels for 300A LoadSystem Accuracy Better Than 1%0.6V to 3.6V Output Voltage RangeSwitching Frequency From 200 kHz to 1 MHzPhase Current Sharing ±12% Max Over TemperatureIntegrated 4.35V ±2.3% LDOInductor DCR or Sense Resistor Current SensingInterleaved Switching for Low I/O Ripple CurrentIntegrated Synchronous NFET DriversProgrammable Soft-StartPre-Biased StartupOutput Voltage Differential Remote SensingMinimum Controllable On-Time of Only 50 nsProgrammable Enable and Input UVLOPower Good flagOVP, UVP and Hiccup Over-Current ProtectionAll trademarks are the property of their respective owners.Wide Input Voltage Range of 4.5V to 18VUp to 12 Channels for 300A LoadSystem Accuracy Better Than 1%0.6V to 3.6V Output Voltage RangeSwitching Frequency From 200 kHz to 1 MHzPhase Current Sharing ±12% Max Over TemperatureIntegrated 4.35V ±2.3% LDOInductor DCR or Sense Resistor Current SensingInterleaved Switching for Low I/O Ripple CurrentIntegrated Synchronous NFET DriversProgrammable Soft-StartPre-Biased StartupOutput Voltage Differential Remote SensingMinimum Controllable On-Time of Only 50 nsProgrammable Enable and Input UVLOPower Good flagOVP, UVP and Hiccup Over-Current ProtectionAll trademarks are the property of their respective owners.

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. 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.