LM34923 Series

80V, 600 mA Constant On-Time Buck Switching Regulator

Catalog

80V, 600 mA Constant On-Time Buck Switching Regulator

Part	Supplier Device Package	Number of Outputs	Package / Case	Package / Case [x]	Package / Case [x]	Current - Output	Operating Temperature [Min]	Operating Temperature [Max]	Output Configuration	Output Type	Voltage - Input (Max) [Max]	Voltage - Output (Min/Fixed)	Synchronous Rectifier	Topology	Voltage - Output (Max) [Max]	Mounting Type	Voltage - Input (Min) [Min]	Function
Texas Instruments LM34923MMX/NOPB	10-VSSOP	1	10-MSOP 10-TFSOP	3 mm	0.118 in	600 mA	-40 °C	125 ¯C	Positive	Adjustable	75 V	2.5 V		Buck	75 V	Surface Mount	6 V	Step-Down
Texas Instruments LM34923MM/NOPB	10-VSSOP	1	10-MSOP 10-TFSOP	3 mm	0.118 in	600 mA	-40 °C	125 ¯C	Positive	Adjustable	75 V	2.5 V		Buck	75 V	Surface Mount	6 V	Step-Down

Catalog

80V, 600 mA Constant On-Time Buck Switching Regulator

Key Features

• Operating Input Voltage Range: 6V to 75VIntegrated 80V, N-Channel Buck SwitchInternal Start-up RegulatorNo Loop Compensation RequiredUltra-Fast Transient ResponseOperating Frequency Remains Constant with Line and Load VariationsAdjustable Output voltage From 2.5VPrecision Internal Reference, ±2.5%Intelligent Current Limit Reduces FoldbackProgrammable Input UV Detector with Status Flag OutputPre-charge Switch Enables Bootstrap Gate Drive with No LoadThermal Shutdown10-Pin VSSOP PackageOperating Input Voltage Range: 6V to 75VIntegrated 80V, N-Channel Buck SwitchInternal Start-up RegulatorNo Loop Compensation RequiredUltra-Fast Transient ResponseOperating Frequency Remains Constant with Line and Load VariationsAdjustable Output voltage From 2.5VPrecision Internal Reference, ±2.5%Intelligent Current Limit Reduces FoldbackProgrammable Input UV Detector with Status Flag OutputPre-charge Switch Enables Bootstrap Gate Drive with No LoadThermal Shutdown10-Pin VSSOP Package

Description

The LM34923 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient Buck bias regulator. This high voltage regulator contains an 80V N-Channel MOSFET Switch and a startup regulator. The device is easy to implement and is provided in an 10-pin VSSOP package. The regulator’s control scheme uses an on-time inversely proportional to VIN. This feature results in the operating frequency remaining relatively constant with line and load variations. The control scheme requires no loop compensation, resulting in fast transient response. An intelligent current limit is implemented with a forced off-time which is inversely proportional to VOUT. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal Shutdown, VCC Under Voltage Lock-out, Max Duty Cycle Limiter, a Pre-charge Switch, and a programmable Under Voltage Detector with a status flag output. The LM34923 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient Buck bias regulator. This high voltage regulator contains an 80V N-Channel MOSFET Switch and a startup regulator. The device is easy to implement and is provided in an 10-pin VSSOP package. The regulator’s control scheme uses an on-time inversely proportional to VIN. This feature results in the operating frequency remaining relatively constant with line and load variations. The control scheme requires no loop compensation, resulting in fast transient response. An intelligent current limit is implemented with a forced off-time which is inversely proportional to VOUT. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal Shutdown, VCC Under Voltage Lock-out, Max Duty Cycle Limiter, a Pre-charge Switch, and a programmable Under Voltage Detector with a status flag output.