PMIC - Voltage Regulators - Special Purpose

Part Number	Description / PDF	Quantity
A8292SETTR-T Allegro MicroSystems	DUAL VOLTAGE REGULATOR	4000
A8300SESTR-T-1 Allegro MicroSystems	IC REG CONV LNB 1OUT 24QFN	0
A8307SESTR-T Allegro MicroSystems	IC REG LNB SUP/CTRL 1OUT 20QFN	0
A8285SLBTR-T Allegro MicroSystems	LNB SUPPLY AND VOLTAGE REGULATOR	0
A8304SESTR-T Allegro MicroSystems	IC REG CONV LNB 16QFN	0
A8293SESTR-T Allegro MicroSystems	SINGLE SUPPLY VOLTAGE REGULATOR	81000
A8302SETTR-T Allegro MicroSystems	A8302 - DUAL LNB SUPPLY AND CONT	15000
A8295SESTR-T Allegro MicroSystems	CONTACT FACTORY FOR PRICING	6000
A8290SETTR-T Allegro MicroSystems	SINGLE SUPPLY VOLTAGE REGULATOR	4168
A8305SESTR-T Allegro MicroSystems	SINGLE LNB SUPPLY AND CONTROL VO	40500
A8297SETTR-T Allegro MicroSystems	ANALOG CIRCUIT, 1 FUNC	347
A8603KESTR-R Allegro MicroSystems	IC REG CONV LCD 4OUT 24QFN	627
A8603KLPTR-T Allegro MicroSystems	IC REG CONV LCD 4OUT 24TSSOP	0
A8296SESTR-T Allegro MicroSystems	IC REG CONV RECVRS 1OUT 16QFN	1281
A8601KLPTR-T Allegro MicroSystems	IC REG CONV LCD 5OUT 28TSSOP	98
A8300SESTR-T Allegro MicroSystems	IC REG CONV LNB 1OUT 24QFN	0
A8298SESTR-T Allegro MicroSystems	IC REG CONV RECVRS 1OUT 20QFN	0
A8600EJPTR-T Allegro MicroSystems	IC REG AUTO APPL 4OUT 48LQFP	0
A8309SESTR-T Allegro MicroSystems	WIDE INPUT QUASI-ASYNCHRONOUS BU	0
A8294SESTR-T Allegro MicroSystems	IC REG LNB SGL SUP 1OUT 20QFN	0

PMIC - Voltage Regulators - Special Purpose

1. Overview

Special purpose voltage regulators are application-specific power management ICs designed to maintain precise voltage levels for specialized electronic systems. Unlike standard regulators, these devices address unique requirements such as dynamic voltage scaling, multi-rail sequencing, or high-precision reference generation. Their importance in modern technology stems from the need for optimized power delivery in advanced applications including AI accelerators, medical imaging equipment, and automotive sensor systems.

2. Major Types and Functional Classification

Type	Functional Characteristics	Application Examples
LCD Bias Regulators	Generates multiple precision voltages (VCOM, gamma) with high PSRR	Display panels, industrial HMIs
GDDR Power Solutions	Provides AVDD/VDDQ tracking with fast transient response	Graphics cards, AI accelerators
Gate Driver Supplies	Isolated voltage sources with tight tolerance for power MOSFETs	Motor controllers, solar inverters
DAC Reference Buffers	Ultra-low noise (<<1 V) with programmable output	Test equipment, precision sensors

3. Structure and Components

Typical architecture includes:

Advanced packaging (e.g., WLCSP, QFN) with dedicated power/ground pads
Internal compensation networks with frequency response optimization
Multi-stage regulation topology (e.g., LDO + charge pump)
Protection circuits (OVP, UVP, OTP) with fault reporting
Digital interface (I2C/PMBus) for configuration in programmable variants

4. Key Technical Specifications

Parameter	Importance
Output Voltage Accuracy	0.5% for precision applications, 2% for general use
Load Regulation	Must maintain <0.1% deviation across operating range
PSRR	80dB@1kHz critical for noise-sensitive analog circuits
Transient Response	Recovery time <50 s for dynamic loads
Quiescent Current	Optimizes efficiency in always-on systems

5. Application Fields

Primary industries:

Consumer Electronics: OLED displays, VR headsets
Industrial: PLC systems, precision instrumentation
Automotive: LiDAR sensors, ADAS power supplies
Medical: MRI gradient drivers, portable diagnostics

6. Leading Manufacturers and Products

Manufacturer	Key Products	Specialization
TI	TPS65130	Multi-output LCD bias supply
STMicro	LD6983	Automotive-grade gate driver supply
Analog Devices	ADP5090	Energy harvesting systems
Infineon	CYPD3171	USB-C power delivery controller

7. Selection Guidelines

Key considerations:

Match output configuration (single/multi-channel) to system requirements
Evaluate thermal performance under max load conditions
Assess compatibility with system-level power sequencing
Prioritize devices with integrated protection features

Case Study: Smartphone display subsystems typically select regulators with integrated gamma reference buffers and spread-spectrum control to minimize EMI.

8. Industry Trends

Current development directions:

Integration of digital calibration with 0.1mV resolution
Adoption of GaN/SiC compatible driver circuits
AI-enabled dynamic voltage scaling algorithms
Sub-100nm process technology for multi-rail PMICs
Enhanced safety features for ISO 26262 compliance