component

LP5907 Low-Noise LDO

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by Ray

250 mA ultra-low-noise LDO with high PSRR for RF and analog supplies.

regulatorldolow-noisehigh-psrrrftisot-23-5
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README

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LP5907

Texas Instruments · Linear Regulator (LDO) · SOT-23-5

The LP5907 is a 250 mA low-dropout regulator designed for low output noise (6.5 uVrms) and high power-supply rejection. Its clean output makes it well suited to powering sensitive RF, PLL, ADC, and precision-analog circuits from a noisier rail, in a compact SOT-23-5.

Pinout

Pin Name Type Function
1 IN power_in Input voltage supply, 2.2V to 5.5V (abs max 6V). Connect a 1µF ceramic capacitor to GND at this pin for stability.
2 GND power_in Common ground reference for the device. All voltages are measured with respect to this pin.
3 EN input Enable input. VIH ≥ 1.2V enables the regulator; VIL ≤ 0.4V disables it and discharges VOUT to GND through an internal 230Ω pulldown. Has an internal 1MΩ pulldown to GND so the regulator defaults off if left floating.
4 N/C unconnected No internal electrical connection. May be left floating or tied to any potential.
5 OUT power_out Regulated output voltage (fixed factory option, 1.2V to 4.5V in 25mV steps), up to 250mA. Connect a ≥1µF low-ESR ceramic capacitor to GND. An internal 230Ω (typ) pulldown discharges VOUT when the regulator is disabled (VEN low).

Key specifications

Parameter Value
Type Ultra-low-noise LDO
Output current 250 mA
Output noise 6.5 uVrms (10 Hz to 100 kHz)
PSRR 82 dB at 1 kHz
Dropout voltage 120 mV at 150 mA
Input voltage 2.2 V to 5.5 V
Operating temperature -40 C to 125 C

Ordering variants

Same part, different packaging or reel option.

  • LP5907DBV
  • LP5907DQN
  • LP5907YKE
  • LP5907YKG
  • LP5907YKM
  • LP5907YCR

CAD (KiCad official)

  • Symbol: lp5907.kicad_sym
  • Footprint: lp5907.kicad_mod
  • 3D model: SOT-23-5 body from KiCad Package_TO_SOT_SMD/SOT-23-5.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (52 pp, sha256 f5deda2f0cd6f251, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF