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Product details

Parameters

Output options Fixed Output Iout (Max) (A) 0.15 Vin (Max) (V) 6 Vin (Min) (V) 2.5 Vout (Max) (V) 5 Vout (Min) (V) 2.5 Fixed output options (V) 2.5, 2.6, 2.7, 2.8, 2.85, 2.9, 3, 3.1, 3.2, 3.3, 4.7, 4.75, 4.8, 5 Noise (uVrms) 30 Iq (Typ) (mA) 0.085 Thermal resistance θJA (°C/W) 220 Load capacitance (Min) (µF) 1 Rating Catalog Regulated outputs (#) 1 Features Enable Accuracy (%) 2 PSRR @ 100 KHz (dB) 42 Dropout voltage (Vdo) (Typ) (mV) 60 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

DSBGA (YZR) 5 2 mm² 1.054 x 1.511 SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 open-in-new Find other Linear regulators (LDO)

Features

  • Input Voltage: 2.5 V to 6 V
  • 100-mV Maximum Dropout with 150-mA Load
  • 150-mA Verified Output
  • 50-dB PSRR at 1 kHz at VIN = VOUT + 0.2 V
  • ≤ 1.5-µA Quiescent Current when Shut Down
  • Fast Turn-On time: 200 µs (typ.)
  • 30-µVRMS Output Noise (typical) over 10 Hz to 100
    kHz
  • −40°C to 125°C Junction Temperature Range for
    Operation
  • 2.5-V, 2.6-V, 2.7-V, 2.8-V, 2.85-V, 2.9-V, 3-V, 3.1-
    V, 3.2-V, 3.3-V, 4.7-V, 4.75-V, 4.8-V and 5-V
    Outputs Standard
  • Logic Controlled Enable
  • Stable with Ceramic and High-Quality Tantalum
    Capacitors
  • Fast Turnon
  • Thermal Shutdown and Short-Circuit Current Limit
open-in-new Find other Linear regulators (LDO)

Description

The LP3985 is designed for portable and wireless applications with demanding performance and space requirements. LP3985 performance is optimized for battery-powered systems to deliver ultra low noise, extremely low dropout voltage, and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life.

The LP3985 is stable with a small 1-µF ±30% ceramic or high-quality tantalum output capacitor. The DSBGA requires the smallest possible PC board area – the total application circuit area can be less than 2 mm × 2.5 mm, a fraction of a 1206 case size.

An optional external bypass capacitor reduces the output noise without slowing down the load transient response. Fast startup time is achieved by utilizing an internal power-on circuit that actively pre-charges the bypass capacitor.

Power supply rejection is better than 50 dB at low frequencies and starts to roll off at 1 kHz. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits.

The device is ideal for mobile phone and similar battery-powered wireless applications. It provides up to 150 mA, from a 2.5-V to 6-V input. The LP3985 consumes less than 1.5 µA in disable mode and has fast turn-on time less than 200 µs.

The LP3985 is available with fixed output voltages from 2.5 V to 5 V. Contact Texas Instruments Sales for specific voltage option needs.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 9
Type Title Date
* Datasheet LP3985 Micropower, 150-mA Low-Noise Ultra-Low-Dropout CMOS Voltage Regulator datasheet (Rev. AE) May 08, 2015
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
User guide Universal Low-Dropout (LDO) Linear Voltage Regulator EVM User's Guide Oct. 12, 2016
User guide AN-1219 LP3985 DSBGA-5 Evaluation Board Instruction (Rev. C) Apr. 30, 2013
User guide AN-1223 LP3985 SOT23-5 Evaluation Board (Rev. C) Apr. 30, 2013
Application note Understanding Portable Applications Requirements to Improve System Performance Mar. 22, 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
20
Description

The MULTIPKGLDOEVM-823 evaluation module (EVM) helps you evaluate the operation and performance of several common packages of linear regulators for possible use in circuit applications. This particular EVM configuration has a DRB, DRV, DQN and DBV footprint for you to solder and (...)

Features
  • Supports almost all low-dropout (LDO) linear regulators in DBV, DRB, DRV and DQN packages
DEVELOPMENT KIT Download
699
Description

The K2G Evaluation Module (EVM) enables developers to immediately start evaluating the 66AK2Gx - 600MHz processor, and to accelerate the development of audio, industrial motor control, smart grid protection and other high reliability, real-time compute intensive applications.  Similar to (...)

Features
  • 66AK2G02 C66x DSP+ARM A15 Processor at 600MHz
  • 2-GByte DDR3L with ECC
  • TPS659118 PMIC
  • Audio and Serial expansion headers
  • Processor SDK Linux and TI-RTOS support
  • Supports Gigabit Ethernet
DEVELOPMENT KIT Download
699
Description

The EVMK2GX (also known as "K2G") 1GHz Evaluation Module (EVM) enables developers to immediately start evaluating the 66AK2Gx processor family, and to accelerate the development of audio, industrial motor control, smart grid protection and other high reliability, real-time compute intensive (...)

Features
  • 66AK2G12 C66x DSP+ARM A15 Processor at 1GHz
  • 2-GByte DDR3L with ECC
  • TPS65911A PMIC
  • Audio and serial expansion headers
  • Processor SDK Linux and TI-RTOS support
DEVELOPMENT KIT Download
1049
Description

The K2G 1GHz High Secure Evaluation Module (EVM) enables developers to start  evaluating and testing the programming of the  high secure developmental version of the  66AK2Gx processor, and to accelerate the next stage of secure boot product development of audio and industrial real (...)

Features
  • 66AK2G12 C66x DSP+ARM A15 Processor at 1GHz
  • 2-GByte DDR3L with ECC
  • TPS65911A PMIC
  • Audio and serial expansion headers
  • Processor SDK Linux and TI-RTOS support

Reference designs

REFERENCE DESIGNS Download
1500-W AC switch bridgeless PFC reference design
PMP22220 — This reference design is an AC switch bridgeless power factor correction (PFC) that operates with continuous conduction mode (CCM). It takes universal AC-input voltage (90 VAC to 264 VAC), provides 390-V, 1000-W low-line output and 1500-W high-line output. This design uses the UCD3138 digital (...)
document-generic Schematic
REFERENCE DESIGNS Download
400V – 12V/500W High Frequency Resonant Converter Reference Design Using High Voltage GaN Devices
PMP20289 — The PMP20289 was built and tested to verify the performance of a high frequency (>400kHz nominal switching frequency) LLC series resonant converter (LLC-SRC) implemented with Texas Instrument’s high voltage GaN FETs under nominal (390V to 12V) voltage conversion. The digital controller (...)
document-generic Schematic
Design files
REFERENCE DESIGNS Download
High Efficiency and High Power Density 1kW Resonant Converter Reference Design with TI HV GaN FET
PMP20637 — This reference design is a high efficiency, high power density and light weight resonant converter reference design. It converts a 390V input to a 48V/1kW output. The PMP20637 power stage has over 140W/in^3 power density. The whole board weight is less than 210g. With fixed 950kHz switching (...)
document-generic Schematic
Design files
REFERENCE DESIGNS Download
24-V/500-W resonant converter reference design with HV GaN FET
PMP21309 — This reference design is a high-frequency resonant converter reference design. The output voltage is regulated to 24 V with input voltage ranges from 380 V to 400 V using a resonant tank with 500 kHz resonant frequency. A 97.9% peak efficiency is achieved with this design using TI’s (...)
document-generic Schematic
REFERENCE DESIGNS Download
12-V/500-W resonant converter reference design with HV GaN FET
PMP21842 — This high-frequency resonant converter reference design regulates a 12-V output from a 380-V to 400-V input voltage range using a resonant tank with 500 kHz resonant frequency. A peak efficiency of 96.0% (bias supply included) is achieved with this design using our high-voltage GaN device along with (...)
document-generic Schematic
REFERENCE DESIGNS Download
Isolated CAN Flexible Data (FD) Rate Repeater Reference Design
TIDA-01487 — CAN and CANopen are legacy fieldbus protocols used in many applications in factory automation. Whenever high voltage could damage the end equipment there is need for isolation. This isolated CAN flexible data (FD) rate repeater reference design adds electrical isolation between two CAN bus (...)
document-generic Schematic
REFERENCE DESIGNS Download
High Efficiency and Power Density 1kW Resonant Converter Reference Design with High Voltage GaN FET
PMP20978 — The PMP20978 reference design is a high efficiency, high power density and light weight resonant converter reference design. It converts a 390V input to a 48V/1kW output. The PMP20637 power stage has over 140W/in^3 power density. The whole board weight is less than 230g. With fixed 950kHz switching (...)
document-generic Schematic
Design files

CAD/CAE symbols

Package Pins Download
DSBGA (YZR) 5 View options
SOT-23 (DBV) 5 View options

Ordering & quality

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