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38 V, 500 mA synchronous step-down switching regulator with 30 µA quiescent current

Quantity $ per Unit Savings
1 - 9$3.420%
10 - 24$3.168%
25 - 99$3.0311%
100 - 249$2.7420%
250 - 499$2.6523%
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Parameter NameParameter Value
Operating RangeIndustrial
Input Voltage Min Volt4.0
Input Voltage Max Volt38.0
Packing TypeTube
RoHs compliantEcopack2
Package NameHTSSOP16

The L6985F is a step-down monolithic switching regulator able to deliver up to 0.5 A DC. The output voltage adjustability ranges from 0.85V to VIN. Thanks to the P-channel MOSFET high-side power element, the device features 100% of the duty cycle operation. The wide input voltage range meets the specification for the 5 V, 12 V and 24 V power supplies. The “Low Consumption Mode” (LCM) is designed for applications active during the idle mode, so it maximizes the efficiency at the light-load with the controlled output voltage ripple. The “Low Noise Mode” (LNM) makes the switching frequency constant overload current range, meeting the low noise application specification. The output voltage supervisor manages the reset phase for any digital load (μC, FPGA). The RST open collector output can also implement output voltage sequencing during the power-up phase. The synchronous rectification, designed for high efficiency at the medium - heavy load, and the high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing on both power elements implements effective constant current protection.

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