LM20333 Series

4.5-36V, 3A Current Mode Synchronous Buck Regulator with Frequency Synchronization

Catalog

4.5-36V, 3A Current Mode Synchronous Buck Regulator with Frequency Synchronization

Part	Number of Outputs	Supplier Device Package	Voltage - Output (Min/Fixed)	Operating Temperature [Min]	Operating Temperature [Max]	Output Configuration	Function	Package / Case	Package / Case [custom]	Package / Case	Frequency - Switching	Mounting Type	Topology	Voltage - Output (Max) [Max]	Output Type	Voltage - Input (Max) [Max]	Voltage - Input (Min) [Min]	Current - Output	Utilized IC / Part	Regulator Topology	Outputs and Type	Outputs and Type	Supplied Contents	Main Purpose	Voltage - Input [Max]	Voltage - Input [Min]	Voltage - Output	Board Type
Texas Instruments LM20333MHE/NOPB	1	20-HTSSOP	0.8 V	-40 °C	125 ¯C	Positive	Step-Down	20-PowerTSSOP	4.4 mm	0.173 in	200 kHz	Surface Mount	Buck	32 V	Adjustable	36 V	4.5 V	3 A
Texas Instruments LM20333MHX/NOPB	1	20-HTSSOP	0.8 V	-40 °C	125 ¯C	Positive	Step-Down	20-PowerTSSOP	4.4 mm	0.173 in	200 kHz	Surface Mount	Buck	32 V	Adjustable	36 V	4.5 V	3 A
Texas Instruments LM20333EVAL/NOPB																		3 A	LM20333	Buck	Non-Isolated	1	Board(s)	DC/DC Step Down	25 V	4.5 V	3.3 V	Fully Populated
Texas Instruments LM20333EVAL																		3 A	LM20333	Buck	Non-Isolated	1	Board(s)	DC/DC Step Down	25 V	4.5 V	3.3 V	Fully Populated

Catalog

4.5-36V, 3A Current Mode Synchronous Buck Regulator with Frequency Synchronization

Key Features

• 4.5V to 36V Input Voltage Range3A Output Current, 5.2A Peak Current130 mΩ/110 mΩ Integrated Power MOSFETs94% Peak Efficiency with Synchronous Rectification1.5% Feedback Voltage AccuracyCurrent Mode Control, Selectable CompensationOscillator Synchronization from 250kHz to 1.5MHzAdjustable Output Voltage Down to 0.8VCompatible with Pre-biased LoadsProgrammable Soft-start with External CapacitorPrecision Enable Pin with HysteresisOVP, UVLO Inputs and PGOOD OutputInternally Protected with Peak Current Limit, Thermal Shutdown and RestartAccurate Current Limit Minimizes Inductor SizeNon-linear Current Mode Slope Compensation20-Pin HTSSOP Exposed Pad PackageAll trademarks are the property of their respective owners.4.5V to 36V Input Voltage Range3A Output Current, 5.2A Peak Current130 mΩ/110 mΩ Integrated Power MOSFETs94% Peak Efficiency with Synchronous Rectification1.5% Feedback Voltage AccuracyCurrent Mode Control, Selectable CompensationOscillator Synchronization from 250kHz to 1.5MHzAdjustable Output Voltage Down to 0.8VCompatible with Pre-biased LoadsProgrammable Soft-start with External CapacitorPrecision Enable Pin with HysteresisOVP, UVLO Inputs and PGOOD OutputInternally Protected with Peak Current Limit, Thermal Shutdown and RestartAccurate Current Limit Minimizes Inductor SizeNon-linear Current Mode Slope Compensation20-Pin HTSSOP Exposed Pad PackageAll trademarks are the property of their respective owners.

Description

The LM20333 is a full featured synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems. The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good (PGOOD) circuit. The LM20333 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20333 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin. The switching frequency of the LM20333 can be synchronized to an external clock by use of the SYNC pin. The SYNC pin is capable of synchronizing to input signals ranging from 250 kHz to 1.5 MHz. The LM20333 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks. The LM20333 is a full featured synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems. The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good (PGOOD) circuit. The LM20333 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20333 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin. The switching frequency of the LM20333 can be synchronized to an external clock by use of the SYNC pin. The SYNC pin is capable of synchronizing to input signals ranging from 250 kHz to 1.5 MHz. The LM20333 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.