SM72485 Series

100V, 150 mA Constant On-Time Buck Switching Regulator

Catalog

100V, 150 mA Constant On-Time Buck Switching Regulator

Part	Supplier Device Package	Output Type	Voltage - Input (Min) [Min]	Output Configuration	Voltage - Output (Max) [Max]	Voltage - Output (Min/Fixed)	Frequency - Switching [Min]	Frequency - Switching [Max]	Number of Outputs	Topology	Voltage - Input (Max) [Max]	Operating Temperature [Min]	Operating Temperature [Max]	Function	Package / Case	Current - Output	Mounting Type	Package / Case [custom]	Package / Case
Texas Instruments SM72485X/NOPB	8-WSON (4x4)	Adjustable	6 V	Positive	85 V	2.5 V	50 kHz	1.1 MHz	1	Buck	95 V	-40 °C	125 ¯C	Step-Down	8-WDFN Exposed Pad	150 mA	Surface Mount
Texas Instruments SM72485MM/NOPB		Adjustable	6 V	Positive	85 V	2.5 V	50 kHz	1.1 MHz	1	Buck	95 V	-40 °C	125 ¯C	Step-Down	8-MSOP 8-TSSOP	150 mA	Surface Mount	0.118 in	3 mm
Texas Instruments SM72485SD/NOPB	8-WSON (4x4)	Adjustable	6 V	Positive	85 V	2.5 V	50 kHz	1.1 MHz	1	Buck	95 V	-40 °C	125 ¯C	Step-Down	8-WDFN Exposed Pad	150 mA	Surface Mount
Texas Instruments SM72485MMX/NOPB		Adjustable	6 V	Positive	85 V	2.5 V	50 kHz	1.1 MHz	1	Buck	95 V	-40 °C	125 ¯C	Step-Down	8-MSOP 8-TSSOP	150 mA	Surface Mount	0.118 in	3 mm

Catalog

100V, 150 mA Constant On-Time Buck Switching Regulator

Key Features

• Operating Input Voltage: 6 V to 95 VIntegrated 100-V, N-Channel Buck SwitchInternal Start-Up RegulatorNo Loop Compensation RequiredUltra-Fast Transient ResponseOn-time Varies Inversely With Input VoltageOperating Frequency Remains Constant With Varying Line Voltage and Load CurrentAdjustable Output Voltage From 2.5 VHighly Efficient OperationPrecision Internal ReferenceLow Bias CurrentIntelligent Current LimitThermal ShutdownPackageVSSOP (3 mm × 3 mm)WSON (4 mm × 4 mm)Operating Input Voltage: 6 V to 95 VIntegrated 100-V, N-Channel Buck SwitchInternal Start-Up RegulatorNo Loop Compensation RequiredUltra-Fast Transient ResponseOn-time Varies Inversely With Input VoltageOperating Frequency Remains Constant With Varying Line Voltage and Load CurrentAdjustable Output Voltage From 2.5 VHighly Efficient OperationPrecision Internal ReferenceLow Bias CurrentIntelligent Current LimitThermal ShutdownPackageVSSOP (3 mm × 3 mm)WSON (4 mm × 4 mm)

Description

The SM72485 step-down switching regulator features all of the functions required to implement a low cost, efficient, Buck bias regulator. This high voltage regulator contains an 100-V N-channel buck switch. The device is easy to implement and is provided in the VSSOP and the thermally enhanced WSON package. The regulator is based on a control scheme using an on-time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The control scheme requires no loop compensation. An intelligent current limit is implemented with forced off-time, which is inversely proportional to VOUT. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal shutdown, VCCundervoltage lockout, gate drive undervoltage lockout, maximum duty cycle limiter, and a precharge switch. The SM72485 step-down switching regulator features all of the functions required to implement a low cost, efficient, Buck bias regulator. This high voltage regulator contains an 100-V N-channel buck switch. The device is easy to implement and is provided in the VSSOP and the thermally enhanced WSON package. The regulator is based on a control scheme using an on-time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The control scheme requires no loop compensation. An intelligent current limit is implemented with forced off-time, which is inversely proportional to VOUT. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal shutdown, VCCundervoltage lockout, gate drive undervoltage lockout, maximum duty cycle limiter, and a precharge switch.