38 V, 0.5 A synchronous step-down switching regulator evaluation board based on A6985F

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1 - 2$24.500%
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Parameter NameParameter Value
Target ApplicationDC-DC Topologies
Core ProductA6985F
Input Voltage Min Volt4.0
Input Voltage Max Volt38.0
Packing TypeNot Applicable
RoHs compliantEcopack2
Package NameCARD

The STEVAL-ISA187V1 is a product evaluation board based on the ST synchronous step-down switching regulator A6985F, which can deliver up to 0.5 A and, with its 100% duty cycle ability to withstand cold crank events and wide input operating voltage range, represents the ideal choice for battery-powered automotive systems. Synchronous rectification helps achieve higher efficiency at full load as well as application compactness, while high-frequency switching (programmable up to 2 MHz) helps reduce the cost and size of power passive components while remaining outside the AM band.

The device can operate in low consumption mode (LCM), with a quiescent current of 30 μA at VIN=12 V and VOUT= 3.3 V that ensures high efficiency under light load, which is a requirement in typical car body applications that are active when a car is parked. A low noise mode (LNM) can be selected to meet the requirements of infotainment applications with forced PWM mode under all load conditions. The default board configuration is LCM active, 2 MHz switching frequency, high ISKIP current and the switchover feature enabled, but all of these settings can be easily changed so the user can evaluate different application scenarios.

Key features
  • AECQ100 qualification
  • 0.5 A DC output current
  • 4 V to 38 V operating input voltage
  • Low consumption mode or low noise mode
  • Programmable ISKIP
  • 30 μA IQ at light load (LCM
    VIN = 12 V and VOUT =3.3 V)
  • 8 μA IQ-SHTDWN
  • Adjustable fSW (250 kHz - 2
  • Output voltage adjustable from 0.85 V to VIN
  • Embedded output voltage supervisor
  • Synchronization
  • Adjustable soft-start time
  • Internal current limiting
  • Overvoltage protection
  • Output voltage sequencing
  • Peak current mode architecture
  • RDS(on)HS = 360 mΩ; RDS(on)LS = 150 mΩ
  • Thermal shutdown
  • RoHS compliant