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NCV551SN50T1G

150mA LDO, 5.0V fixed, 350mV dropout, 45uA Iq, AEC-Q100, SOT-23-5

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Manufacturer Part：

NCV551SN50T1G

Package：

SOT-23-5 (2.9 x 1.6 x 1.1 mm)

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Description

Product Overview

The NCV551SN50T1G from onsemi is a 150mA low-noise, low-dropout voltage regulator with a fixed 5.0V output. It features 350mV dropout, 45uA ground current, and automotive AEC-Q100 qualification in a SOT-23-5 package.

Key Specifications

Output Voltage 5.0V Fixed
Output Current 150mA
Input Voltage Range 5.35V to 12V
Dropout Voltage 350mV (typ @ 150mA)
Ground Current 45uA (typ)
PSRR 65dB @ 1kHz
Output Noise 30uVRMS
Operating Temperature -40 to 125 C

Features

  • 150mA output current capability
  • Low dropout voltage of 350mV at 150mA
  • Low ground current of 45uA
  • 65dB PSRR at 1kHz
  • Stable with 2.2uF ceramic capacitors
  • Enable pin for power sequencing
  • Overcurrent and overtemperature protection
  • AEC-Q100 qualified

Applications

  • Automotive ECU power regulation
  • Post-regulation for DC/DC converters
  • Infotainment system power
  • ADAS sensor power supplies
  • Portable and battery-powered automotive devices

The NCV551SN50T1G from onsemi is a 150mA low-noise, low-dropout voltage regulator with a fixed 5.0V output, designed for automotive and battery-powered applications. The device features a low dropout voltage of 350mV at 150mA and a ground current of only 45uA, making it suitable for always-on power rails in automotive systems. With a PSRR of 65dB at 1kHz and output noise of 30uVRMS, it effectively attenuates input supply noise for sensitive analog circuits. The device is stable with 2.2uF ceramic output capacitors and features an enable pin for power sequencing control. AEC-Q100 qualified, the NCV551SN50T1G operates over the -40 to 125 C automotive temperature range in a compact SOT-23-5 package.

The NCV551SN50T1G operates as a PMOS LDO voltage regulator. Key subsystems include: (1) Voltage Reference – an internal bandgap reference provides the stable 5.0V reference voltage; (2) Error Amplifier – compares a fraction of the output voltage with the internal reference and drives the PMOS gate; (3) PMOS Pass Element – a P-channel MOSFET provides regulation with 350mV dropout at 150mA; (4) Enable Logic – an active-high enable pin controls the pass transistor on/off state; (5) Protection – overcurrent limiting and thermal shutdown protect the device under fault conditions; (6) Compensation – internal frequency compensation ensures stability with 2.2uF ceramic output capacitors.

Pin Name Type Function
1 VIN Input Input voltage supply
2 GND Ground Ground connection
3 EN Input Enable input (active high)
4 NC Unused No connect
5 VOUT Output Regulated 5.0V output
  • Automotive ECU 5V power regulation from 12V battery
  • Post-regulation after DC/DC converters for noise-sensitive loads
  • Infotainment and ADAS system 5V power rails
  • Automotive sensor power supply with low-noise requirements
  • Portable and battery-powered automotive device power
Manufacturer Part Number Package Notes
onsemi NCV551SN33T1G SOT-23-5 3.3V fixed version
Texas Instruments TLV1117-50IDCYR SOT-223 800mA, 5.0V LDO
Microchip MIC5205-5.0YM5-TR SOT-23-5 150mA, 5.0V LDO
Diodes Inc AP2112K-5.0TRG1 SOT-23-5 600mA, 5.0V LDO
Infineon TLE4274SV SOT-223 200mA, 5.0V, automotive
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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