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LP2985-33DBVR

150mA LDO, 3.3V fixed output, 280mV dropout, low noise, SOT-23-5

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Manufacturer Part：

LP2985-33DBVR

Package：

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

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Description

Product Overview

The LP2985-33DBVR is a 150mA low-noise, low-dropout voltage regulator from Texas Instruments, featuring a fixed 3.3V output in a compact SOT-23-5 package. With an input voltage range of 2.5V to 16V and ultra-low quiescent current, it is ideal for battery-powered and portable applications.

Key Specifications

Output Voltage 3.3V Fixed
Output Current 150mA
Input Voltage Range 2.5V to 16V
Dropout Voltage 280mV (typ)
Quiescent Current 71uA (typ)
PSRR 70dB @ 1kHz
Output Noise 30uVRMS with 10nF bypass
Operating Temperature -40 to 125 C

Features

  • Ultra-low dropout voltage
  • Low quiescent current of 71uA
  • High PSRR: 70dB at 1kHz
  • Internal soft-start mechanism
  • Overcurrent and overtemperature protection
  • Stable with 2.2uF ceramic capacitors

Applications

  • Battery-powered portable devices
  • Low-voltage microcontroller power
  • Post-regulation for DC/DC converters
  • Consumer electronics
  • Industrial control systems

The LP2985-33DBVR from Texas Instruments is a fixed-output, wide-input, low-noise, low-dropout voltage regulator designed for portable and battery-powered applications. It supports an input voltage range from 2.5V to 16V and delivers up to 150mA of load current with a fixed 3.3V output. The device features ultra-low quiescent current of 71uA, making it suitable for always-on battery systems. With a high PSRR of 70dB at 1kHz and low output noise of 30uVRMS, it effectively attenuates switching ripple from upstream DC/DC converters. The internal soft-start mechanism reduces inrush current during startup. Standard protection features include overcurrent and overtemperature shutdown. The LP2985-33DBVR is available in a 5-pin SOT-23 package and is stable with 2.2uF ceramic output capacitors.

The LP2985-33DBVR operates as a linear voltage regulator using a pass transistor controlled by an error amplifier. The error amplifier compares a fraction of the output voltage with an internal precision reference and adjusts the pass transistor gate to maintain a constant 3.3V output. Key subsystems include: (1) Voltage Reference – an internal bandgap reference provides the stable reference voltage; (2) Error Amplifier – amplifies the difference between the feedback voltage and the reference to drive the pass element; (3) Pass Transistor – a P-channel MOSFET that regulates the output by controlling current flow from input to output; (4) Protection Circuitry – includes current limiting and thermal shutdown to protect the device under fault conditions. The low dropout is achieved by using a P-channel MOSFET pass element, which requires minimal headroom between input and output.

Pin Name Type Function
1 VIN Input Input voltage supply
2 GND Ground Ground connection
3 EN Input Enable input (active high)
4 BYPASS Input External bypass capacitor for noise reduction
5 VOUT Output Regulated 3.3V output
  • Portable and battery-powered electronics requiring stable 3.3V rail
  • Post-regulation after DC/DC converters for noise-sensitive loads
  • MCU and processor power supply in IoT devices
  • Automotive infotainment and navigation systems
  • Industrial sensor and control modules
Manufacturer Part Number Package Notes
Texas Instruments TLV1117-33 SOT-223 800mA, higher current LDO
Microchip MIC5205-3.3 SOT-23-5 150mA, pin-compatible
Diodes Inc AP2112K-3.3 SOT-23-5 600mA, low dropout
ON Semiconductor NCP551SN33 SOT-23-5 150mA, low Iq
Richtek RT9013-33GB SOT-23-5 300mA, low noise
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Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

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Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

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Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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