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LD49100PURY

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1 A, low quiescent current, low-noise voltage regulator with soft start - Automotive grade

Quantity $ per Unit Savings
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Parameter NameParameter Value
Operating Temp Min Celsius-40.0
Operating Temp Max Celsius125.0
ECCN USEAR99
ECCN EUNEC
Packing TypeTape And Reel
ROHS Compliance GradeEcopack2
GradeAutomotive
Package NameDFN6 3x3

The LD49100 provides 1 A maximum current with an input voltage range from 1.5 V to 5.5 V and a typical dropout voltage of 200 mV. The device is stable with ceramic capacitors on the input and output.


The ultra low-dropout voltage, low quiescent current and low-noise features make it suitable for a wide range of automotive applications. Power supply rejection is 70 dB at low frequency and starts to roll off at 10 kHz. Enable logic control function puts the LD49100 in shutdown mode, allowing a total current consumption lower than 1 μA.


The device features a precise Power Good indicator, useful to monitor and sequence functions. Internal 1 ms soft-start circuit allows the reduction of inrush current.


The device includes the short-circuit constant current limiting and thermal protection. The LD49100 is available in AEC-Q100 grade 1 qualified version, in a small 6-pin DFN6 (3x3 mm) with wettable flank package.

Key features
  • AEC-Q100 qualified
  • Temperature range: -40 °C to 125 °C
  • Input voltage from 1.5 to 5.5 V
  • Ultra low-dropout voltage (200 mV typ. at 1 A load)
  • Very low quiescent current (20 µA typ. at no load, 200 µA typ. at 1 A load, 1 µA max. in off mode)
  • Very low-noise with no bypass capacitor (30 µVRMS at VOUT = 0.8 V)
  • Output voltage tolerance: ± 2.0% at 25 °C
  • 1 A guaranteed output current
  • Wide range of output voltages available on request: 0.8 V to 4.5 V with 100 mV step and adjustable from 0.8 V
  • Logic-controlled electronic shutdown
  • Power Good function
  • Stable with ceramic capacitors COUT = 1 µF
  • Internal current and thermal limit
  • DFN6 (3x3 mm) package with wettable flanks