LP38798 800-mA Ultra-Low-Noise, High-PSRR LDO | TI.com

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800-mA Ultra-Low-Noise, High-PSRR LDO


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The LP38798-ADJ is a high-performance, low-noise LDO that can supply up to 800 mA output current. Designed to meet the requirements of sensitive RF/Analog circuitry, the LP38798-ADJ implements a novel linear topology on an advanced CMOS process to deliver ultra-low output noise and high PSRR at switching power supply frequencies. The LP38798SD-ADJ is stable with both ceramic and tantalum output capacitors and requires a minimum output capacitance of only 1 µF for stability.

The LP38798-ADJ can operate over a wide input voltage range (3 V to 20 V) making it well suited for many post-regulation applications.

For all available packages, see the orderable addendum at the end of the data sheet.


  • Wide Operating Input Voltage Range:
    3 V to 20 V
  • Ultra-Low Output Noise: 5 µVRMS
    (10 Hz to 100 kHz)
  • High PSRR: 90 dB at 10 kHz, 60 dB at 100 kHz
  • ±1% Output Voltage Initial Accuracy (TJ = 25°C)
  • Very Low Dropout: 200 mV (Typical) at 800 mA
  • Stable with Ceramic or Tantalum Output Capacitors
  • Excellent Line and Load Transient Response
  • Current Limit and Overtemperature Protection
  • Create a Custom Design Using the LP38798 With the WEBENCH Power Designer

WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LP38798

  Min   Max Range
Vin  V 3.0 to 20.0V
Vout  V 1.2 to 19.65V
Iout  A ≤ 0.8A
Ambient Temp  °C -40 to 125°C


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Part number Order Output options Iout (Max) (A) Vin (Max) (V) Vin (Min) (V) Vout (Max) (V) Vout (Min) (V) Package Group Features Regulated outputs (#) Operating temperature range (C) Thermal resistance θJA (°C/W) Noise (uVrms) Approx. price (US$) Rating PSRR @ 100 KHz (dB) Accuracy (%) Dropout voltage (Vdo) (Typ) (mV) Iq (Typ) (mA) Package size: mm2:W x L (PKG)
LP38798 Order now Adjustable Output     0.8     20     3     19.8     1.2     WSON | 12     Enable     1     -40 to 125     35     5     1.30 | 1ku     Catalog     65     2     200     1.4     12WSON: 16 mm2: 4 x 4 (WSON | 12)