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SM72485

ACTIVE

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

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LM5163 ACTIVE 100-V input, 0.5-A synchronous buck DC/DC converter with ultra-low IQ Ultra-low EMI emission.

Product details

Vin (min) (V) 6 Vin (max) (V) 95 Vout (min) (V) 2.5 Vout (max) (V) 85 Iout (max) (A) 0.15 Iq (typ) (mA) 0.485 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 600 Features Enable Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (max) (%) 99 Type Converter
Vin (min) (V) 6 Vin (max) (V) 95 Vout (min) (V) 2.5 Vout (max) (V) 85 Iout (max) (A) 0.15 Iq (typ) (mA) 0.485 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 600 Features Enable Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (max) (%) 99 Type Converter
VSSOP (DGK) 8 14.7 mm² 3 x 4.9 WSON (NGU) 8 16 mm² 4 x 4
  • Operating Input Voltage: 6 V to 95 V
  • Integrated 100-V, N-Channel Buck Switch
  • Internal Start-Up Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • On-time Varies Inversely With Input Voltage
  • Operating Frequency Remains Constant With Varying Line Voltage and Load Current
  • Adjustable Output Voltage From 2.5 V
  • Highly Efficient Operation
  • Precision Internal Reference
  • Low Bias Current
  • Intelligent Current Limit
  • Thermal Shutdown
  • Package
    • VSSOP (3 mm × 3 mm)
    • WSON (4 mm × 4 mm)
  • Operating Input Voltage: 6 V to 95 V
  • Integrated 100-V, N-Channel Buck Switch
  • Internal Start-Up Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • On-time Varies Inversely With Input Voltage
  • Operating Frequency Remains Constant With Varying Line Voltage and Load Current
  • Adjustable Output Voltage From 2.5 V
  • Highly Efficient Operation
  • Precision Internal Reference
  • Low Bias Current
  • Intelligent Current Limit
  • Thermal Shutdown
  • Package
    • VSSOP (3 mm × 3 mm)
    • WSON (4 mm × 4 mm)

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, VCC undervoltage 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, VCC undervoltage lockout, gate drive undervoltage lockout, maximum duty cycle limiter, and a precharge switch.

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Technical documentation

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Type Title Date
* Data sheet SM72485 100-V, 150-mA Constant On-Time Buck Switching Regulator datasheet (Rev. E) PDF | HTML 16 Dec 2016
Application note AN-2122 SM3320-RF-EV Reference Design (Rev. E) 06 May 2013
Application note SM3320-BATT-EV Charge Controller Reference Design (Rev. C) 06 May 2013

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Package Pins Download
VSSOP (DGK) 8 View options
WSON (NGU) 8 View options

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