LM2745 Series

1-V to 14-V, voltage mode synchronous buck controller with pre-bias startup and optional clock sync

Catalog

1-V to 14-V, voltage mode synchronous buck controller with pre-bias startup and optional clock sync

Part	Output Type	Mounting Type	Supplier Device Package	Package / Case [custom]	Package / Case [custom]	Package / Case	Function	Topology	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Phases	Control Features	Number of Outputs	Frequency - Switching [Min]	Frequency - Switching [Max]	Duty Cycle (Max) [Max]	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Frequency - Switching	Utilized IC / Part	Regulator Topology	Voltage - Output [Max]	Voltage - Output [Min]	Voltage - Input [Max]	Voltage - Input [Min]	Main Purpose	Current - Output	Board Type	Supplied Contents	Outputs and Type	Outputs and Type
Texas Instruments LM2745MTC	Transistor Driver	Surface Mount	14-TSSOP	0.173 "	4.4 mm	14-TSSOP	Step-Down	Buck	3 V	6 V	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	1	50 kHz	1 MHz	86 %	Positive	-40 °C	125 ¯C
Texas Instruments LM2745-19AEVAL																				300 kHz	LM2745	Buck	3.3 V	1.2 V	14 V	8 V	DC/DC Step Down	19 A	Fully Populated	Board(s)	Non-Isolated	1
Texas Instruments LM2745MTC/NOPB	Transistor Driver	Surface Mount	14-TSSOP	0.173 "	4.4 mm	14-TSSOP	Step-Down	Buck	3 V	6 V	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	1	50 kHz	1 MHz	86 %	Positive	-40 °C	125 ¯C
Texas Instruments LM2745MTCX/NOPB	Transistor Driver	Surface Mount	14-TSSOP	0.173 "	4.4 mm	14-TSSOP	Step-Down	Buck	3 V	6 V	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	1	50 kHz	1 MHz	86 %	Positive	-40 °C	125 ¯C

Catalog

1-V to 14-V, voltage mode synchronous buck controller with pre-bias startup and optional clock sync

Key Features

• Switching Frequency from 50 kHz to 1 MHzSwitching Frequency Synchronize Range 250 kHz to 1 MHz (LM2745 Only)Startup with a Pre-biased Output LoadPower Stage Input Voltage from 1V to 14VControl Stage Input Voltage from 3V to 6VOutput Voltage Adjustable Down to 0.6VPower Good Flag and ShutdownOutput Overvoltage and Undervoltage Detection±1.5% Feedback Voltage Accuracy Over TemperatureLow-side Adjustable Current SensingAdjustable Soft-startTracking and Sequencing with Shutdown and Soft Start PinsTSSOP-14 PackageAll trademarks are the property of their respective owners.Switching Frequency from 50 kHz to 1 MHzSwitching Frequency Synchronize Range 250 kHz to 1 MHz (LM2745 Only)Startup with a Pre-biased Output LoadPower Stage Input Voltage from 1V to 14VControl Stage Input Voltage from 3V to 6VOutput Voltage Adjustable Down to 0.6VPower Good Flag and ShutdownOutput Overvoltage and Undervoltage Detection±1.5% Feedback Voltage Accuracy Over TemperatureLow-side Adjustable Current SensingAdjustable Soft-startTracking and Sequencing with Shutdown and Soft Start PinsTSSOP-14 PackageAll trademarks are the property of their respective owners.

Description

The LM2745/8 are high-speed synchronous buck regulator controllers with an accurate feedback voltage accuracy of ±1.5%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for 3 to 6V, the driver sections are designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost-effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current limit. The LM2745/8 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2745 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs between component size, cost and efficiency. Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout (UVLO) and Power Good (based on both undervoltage and overvoltage detection). In addition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail. The LM2745/8 are high-speed synchronous buck regulator controllers with an accurate feedback voltage accuracy of ±1.5%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for 3 to 6V, the driver sections are designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost-effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current limit. The LM2745/8 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2745 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs between component size, cost and efficiency. Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout (UVLO) and Power Good (based on both undervoltage and overvoltage detection). In addition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail.