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PMIC - Voltage Regulators - Linear

Image Part Number Description / PDF Quantity Rfq
REG101UA-3

REG101UA-3

Burr-Brown (Texas Instruments)

IC REG LINEAR 3V 100MA 8SOIC

29181
REG103FA-3.3/500

REG103FA-3.3/500

Burr-Brown (Texas Instruments)

IC REG LINEAR 3.3V 500MA DDPAK

0
REG104FA-2.7

REG104FA-2.7

Burr-Brown (Texas Instruments)

IC REG LIN 2.7V 1A DDPAK/TO263-5

1386
REG103GA-3/2K5

REG103GA-3/2K5

Burr-Brown (Texas Instruments)

IC REG LINEAR 3V 500MA SOT223-6

2500
REG103FA-2.7

REG103FA-2.7

Burr-Brown (Texas Instruments)

IC REG LINEAR 2.7V 500MA DDPAK

15606
REG101UA-3.3/2K5

REG101UA-3.3/2K5

Burr-Brown (Texas Instruments)

IC REG LINEAR 3.3V 100MA 8SOIC

3128
REG103FA-3

REG103FA-3

Burr-Brown (Texas Instruments)

IC REG LIN 3V 500MA DDPAK/TO263

14100
REG104FA-3

REG104FA-3

Burr-Brown (Texas Instruments)

IC REG LIN 3V 1A DDPAK/TO263-5

2935
REG103UA-3

REG103UA-3

Burr-Brown (Texas Instruments)

IC REG LINEAR 3V 500MA 8SOIC

32474
REG103FA-2.7/500

REG103FA-2.7/500

Burr-Brown (Texas Instruments)

IC REG LINEAR 2.7V 500MA DDPAK

1000
REG711EA-2.5

REG711EA-2.5

Burr-Brown (Texas Instruments)

IC REG LINEAR SWITCHED CAP REG

0
REG103FA-5

REG103FA-5

Burr-Brown (Texas Instruments)

IC REG LIN 5V 500MA DDPAK/TO263

555
REG1117G4

REG1117G4

Burr-Brown (Texas Instruments)

IC REG LIN POS ADJ 800MA SOT223

320
REG104GA-3/2K5

REG104GA-3/2K5

Burr-Brown (Texas Instruments)

IC REG LINEAR 3V 1A SOT223-6

0
REG101UA-5

REG101UA-5

Burr-Brown (Texas Instruments)

IC REG LINEAR 5V 100MA 8SOIC

5464
REG101UA-2.8

REG101UA-2.8

Burr-Brown (Texas Instruments)

IC REG LINEAR 2.8V 100MA 8SOIC

0
REG104FA-3.3

REG104FA-3.3

Burr-Brown (Texas Instruments)

IC REG LIN 3.3V 1A DDPAK/TO263-5

0
REG102UA-3

REG102UA-3

Burr-Brown (Texas Instruments)

IC REG LIN 250MA LOW NOISE LDO

30792
REG101UA-A

REG101UA-A

Burr-Brown (Texas Instruments)

IC REG LIN SGL OUTPUT LDO 100MA

19080
REG103FA-3/500

REG103FA-3/500

Burr-Brown (Texas Instruments)

IC REG LIN 3V 500MA DDPAK/TO263

1000

PMIC - Voltage Regulators - Linear

1. Overview

Linear Voltage Regulators (LVRs) are critical components in Power Management Integrated Circuits (PMICs) that provide stable output voltage levels by dissipating excess input energy as heat. Unlike switching regulators, LVRs operate without high-frequency switching, making them ideal for noise-sensitive applications. Their importance in modern electronics includes ensuring power integrity in portable devices, industrial equipment, and automotive systems.

2. Main Types and Functional Classification

TypeFunctional FeaturesApplication Examples
Low Dropout (LDO) RegulatorsMaintain regulation with minimal input-output voltage differential (e.g., 100mV)Mobile device sensors, RF circuits
Quasi-LDO RegulatorsBalance dropout voltage and load current capabilityIntermediate power stages in IoT devices
Dual/Multi-Output LVRsSingle-chip solutions with multiple regulated outputsApplication processors in smartwatches
High-Precision LVRs 0.5% output voltage accuracy with temperature compensationMedical imaging sensors, test equipment

3. Structure and Components

Typical LVR architecture includes:

  • Reference Voltage Source (bandgap circuit)
  • Error Amplifier with feedback loop
  • Pass Transistor (NMOS/PMOS/BJT) as active regulation element
  • Thermal Shutdown and Overcurrent Protection Circuits
  • Input/Output Capacitor Interfaces

Common packages: QFN (3x3mm), TSSOP, WLCSP for portable devices. High-power variants use flip-chip with exposed thermal pads.

4. Key Technical Specifications

ParameterDescriptionImportance
Input Voltage RangeOperational voltage limits (e.g., 2.7V-5.5V)Determines compatibility with power sources
Output Voltage AccuracyDeviation from nominal value ( 1% to 3%)System stability and component protection
Dropout VoltageMinimum Vin-Vout for regulation (e.g., 30mV-300mV)Battery life optimization in portable devices
Output Current CapabilityMax continuous load current (100mA-3A)Application scalability
PSRR (Power Supply Rejection Ratio)Noise attenuation at specific frequencies (e.g., 70dB at 1kHz)Signal integrity in analog circuits
Quiescent CurrentStandby power consumption (1 A-100 A)Battery efficiency in always-on systems

5. Application Areas

  • Consumer Electronics: Smartphone APUs, SSD controllers
  • Industrial Automation: PLC signal conditioning modules
  • Automotive: ADAS sensors, infotainment system peripherals
  • Medical Devices: Portable diagnostic equipment, wearables
  • Telecommunications: Base station RF front-ends

6. Leading Manufacturers and Products

ManufacturerProduct SeriesKey Features
Texas InstrumentsTPS7A49150mA, 18V input, 75dB PSRR @ 1kHz
STMicroelectronicsLDL11171A output, adjustable via resistor divider
Analog DevicesADP151200mA, 25 A quiescent current, 200mV dropout
ON SemiconductorNCP11171A, thermal overload protection, automotive-grade

7. Selection Guidelines

Key selection criteria:

  1. Match input voltage range with power source (e.g., Li-ion battery requires 2.7V-5.5V)
  2. Prioritize low dropout voltage for battery-powered devices
  3. Calculate thermal dissipation (PD = (Vin-Vout) Iout)
  4. Select appropriate PSRR for noise-sensitive applications (e.g., 60dB for audio circuits)
  5. Consider package thermal resistance for high-current applications

    6. Case Study: A wearable ECG monitor used Analog Devices ADP150 (150mA, 2.2V output, 15 A IQ) to achieve 14-day battery life.

    8. Industry Trends

    • Emerging Ultra-Low Dropout (ULDO) designs with <50mV dropout voltage
    • Integration with PMIC digital interfaces (I2C/PMBus)
    • Advanced packaging: 3D TSV for improved thermal performance
    • Wide bandgap (GaN/SiC) pass transistors for high-voltage LVRs
    • AEC-Q100 compliant automotive LVRs with 150 C operating temperature
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