LM34922 Series

6-28V, 2A Constant On-Time Non-Synchronous Buck Regulator with Adjustable Current Limit

Catalog

6-28V, 2A Constant On-Time Non-Synchronous Buck Regulator with Adjustable Current Limit

Part	Voltage - Output (Max)	Function	Output Configuration	Voltage - Input (Min) [Min]	Voltage - Output (Min/Fixed)	Frequency - Switching	Voltage - Input (Max) [Max]	Synchronous Rectifier	Output Type	Package / Case	Package / Case	Operating Temperature [Min]	Operating Temperature [Max]	Topology	Current - Output	Mounting Type	Number of Outputs	Supplier Device Package
Texas Instruments LM34922MY/NOPB	28 V	Step-Down	Positive	6 V	2.51 V	Adj to 1MHz	28 V		Adjustable	10-MSOP 10-PowerTFSOP	0.118 in 3 mm	-40 °C	125 ¯C	Buck	2 A	Surface Mount	1	10-HVSSOP

Catalog

6-28V, 2A Constant On-Time Non-Synchronous Buck Regulator with Adjustable Current Limit

Key Features

• Input Operating Voltage Range: 6V to 28VAbsolute Maximum Input Rating: 30VIntegrated 2A N-Channel Buck SwitchAdjustable Current Limit Allows for Smaller InductorAdjustable Output Voltage from 2.51VMinimum Ripple Voltage at VOUTPower Good OutputSwitching Frequency Adjustable to 1MHzCOT Topology Features:Switching Frequency Remains Nearly Constant with Load Current and Input Voltage VariationsUltra-Fast Transient ResponseNo Loop Compensation RequiredStable Operation with Ceramic Output CapacitorsAllows for Smaller Output Capacitor and Current Sense ResistorAdjustable Soft-Start TimingThermal ShutdownPrecision 2% Feedback ReferenceAll trademarks are the property of their respective owners.Input Operating Voltage Range: 6V to 28VAbsolute Maximum Input Rating: 30VIntegrated 2A N-Channel Buck SwitchAdjustable Current Limit Allows for Smaller InductorAdjustable Output Voltage from 2.51VMinimum Ripple Voltage at VOUTPower Good OutputSwitching Frequency Adjustable to 1MHzCOT Topology Features:Switching Frequency Remains Nearly Constant with Load Current and Input Voltage VariationsUltra-Fast Transient ResponseNo Loop Compensation RequiredStable Operation with Ceramic Output CapacitorsAllows for Smaller Output Capacitor and Current Sense ResistorAdjustable Soft-Start TimingThermal ShutdownPrecision 2% Feedback ReferenceAll trademarks are the property of their respective owners.

Description

The LM34922 Constant On-time Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying up to 2A of load current. This voltage regulator contains an N-Channel Buck switch, a startup regulator, current limit detection, and internal ripple control. The constant on-time regulation principle requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load. The adjustable valley current limit detection results in a smooth transition from constant voltage to constant current mode when current limit is reached, without the use of current limit foldback. The PGD output indicates the output voltage has increased to within 5% of the expected regulation value. Additional features include: Low output ripple, VIN under-voltage lock-out, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-voltage lock-out, and maximum duty cycle limit. The LM34922 Constant On-time Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying up to 2A of load current. This voltage regulator contains an N-Channel Buck switch, a startup regulator, current limit detection, and internal ripple control. The constant on-time regulation principle requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load. The adjustable valley current limit detection results in a smooth transition from constant voltage to constant current mode when current limit is reached, without the use of current limit foldback. The PGD output indicates the output voltage has increased to within 5% of the expected regulation value. Additional features include: Low output ripple, VIN under-voltage lock-out, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-voltage lock-out, and maximum duty cycle limit.