PMIC - Voltage Regulators

PMIC - Voltage Regulators - Linear

Part Number	Description / PDF	Quantity
LP3875ESX-3.3/NOPB Texas Instruments	IC REG LINEAR 3.3V 1.5A DDPAK	345
REG102GA-AG4 Texas Instruments	IC REG LIN POS ADJ 250MA SOT223	0
REG104FA-5/500 Texas Instruments	IC REG LIN 5V 1A DDPAK/TO263-5	288
TPS77615PWPR Texas Instruments	IC REG LIN 1.5V 500MA 20HTSSOP	0
TPS76630DR Texas Instruments	IC REG LINEAR 3V 250MA 8SOIC	1227
LM2937ET-12/NOPB Texas Instruments	IC REG LINEAR 12V 500MA TO220-3	6922
TPS73633DRBTG4 Texas Instruments	IC REG LINEAR 3.3V 400MA 8SON	0
TPS76725QPWPREP Texas Instruments	IC REG LINEAR 2.5V 1A 20HTSSOP	1723
LM2931CS Texas Instruments	IC REG LIN POS ADJ 100MA DDPAK	4
TPS72718YFFT Texas Instruments	IC REG LINEAR 1.8V 250MA 4DSBGA	0
TPS7B4253QDDARQ1 Texas Instruments	IC REG LIN POS ADJ 300MA 8SO	0
TPS79430DGNT Texas Instruments	IC REG LINEAR 3V 250MA 8MSOP PWR	8750
LP2966IMM-3325-TI Texas Instruments	IC REG LINEAR FIXED POS LDO 2OUT	7000
LM2937IMPX-10/NOPB Texas Instruments	IC REG LINEAR 10V 400MA SOT223-4	4114
LM2940SX-8.0/NOPB Texas Instruments	IC REG LIN 8V 1A DDPAK/TO263-3	482
LM317SX/NOPB Texas Instruments	IC REG LIN POS ADJ 1.5A DDPAK	0
LP38690DT-5.0/NOPB Texas Instruments	IC REG LINEAR 5V 1A TO252-3	2785
TL750L10CKC Texas Instruments	IC REG LINEAR FIXED LDO REG	182
TPS7A0515PDQNT Texas Instruments	IC REG LINEAR 1.5V 200MA 4X2SON	1380
TPS7A0225PDQNR Texas Instruments	IC REG LINEAR 2.5V 200MA 4X2SON	1541

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

Type	Functional Features	Application Examples
Low Dropout (LDO) Regulators	Maintain regulation with minimal input-output voltage differential (e.g., 100mV)	Mobile device sensors, RF circuits
Quasi-LDO Regulators	Balance dropout voltage and load current capability	Intermediate power stages in IoT devices
Dual/Multi-Output LVRs	Single-chip solutions with multiple regulated outputs	Application processors in smartwatches
High-Precision LVRs	0.5% output voltage accuracy with temperature compensation	Medical 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

Parameter	Description	Importance
Input Voltage Range	Operational voltage limits (e.g., 2.7V-5.5V)	Determines compatibility with power sources
Output Voltage Accuracy	Deviation from nominal value ( 1% to 3%)	System stability and component protection
Dropout Voltage	Minimum Vin-Vout for regulation (e.g., 30mV-300mV)	Battery life optimization in portable devices
Output Current Capability	Max 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 Current	Standby 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

Manufacturer	Product Series	Key Features
Texas Instruments	TPS7A49	150mA, 18V input, 75dB PSRR @ 1kHz
STMicroelectronics	LDL1117	1A output, adjustable via resistor divider
Analog Devices	ADP151	200mA, 25 A quiescent current, 200mV dropout
ON Semiconductor	NCP1117	1A, thermal overload protection, automotive-grade

7. Selection Guidelines

Key selection criteria:

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

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