PMIC - Voltage Regulators - Special Purpose

Part Number	Description / PDF	Quantity
RT5047AGSP Richtek	IC REG CONV LNB 1OUT 8SOP	4
RT9045GSP Richtek	IC REG CONV DDR BUS 1OUT 8SOP	4149
RT5047GSP Richtek	IC REG CONV LNB 1OUT 8SOP	0
RT8856GQW Richtek	IC REG CTRL IMVP-6.5 1OUT 40WQFN	0
RT8205AGQW Richtek	IC REG CTRLR NOTEBK 2OUT 24WQFN	0
RT9089AGQW(2) Richtek	IC REG CONV DDR 1OUT 10WDFN	0
RT9199GSP Richtek	IC REG CONV DDR BUS 1OUT 8SOP	0
RT5047BFGSP Richtek	IC REG CONV LNB 1OUT 8SOP	0
RT9026GFP Richtek	IC REG CONV DDR 1OUT 10MSOP	1946
RT9173CGSP Richtek	IC REG CONV DDR BUS 1OUT 8SOP	0
RT8121GQW Richtek	IC REG CTRLR VID 1OUT 20WQFN	0
RT4723WSC Richtek	IC REG AMOLED DISPL 2OUT 15WLCSP	0
RT8205CGQW Richtek	IC REG CTRLR NOTEBK 2OUT 24WQFN	0
RT9173DGSP Richtek	IC REG CONV DDR BUS 1OUT 8SOP	1666
RT2568GQW Richtek	IC REG CONV DDR 1OUT 10WDFN	0
RT8167AGQW Richtek	IC REG CTRLR IMVP-7 2OUT 48WQFN	0
RT8509AGQW Richtek	IC REG CONV TFT LCD 1OUT 12WDFN	0
RT9088GQW Richtek	IC REG CONV DDR 1OUT 10WDFN	0
RT9991GQV Richtek	IC REG CONV SSD 3OUT 32VQFN	104
RT8207GQW Richtek	IC REG CTRLR DDR 1OUT 24WQFN	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