PMIC - Battery Chargers

Part Number	Description / PDF	Quantity
RT9535GQW Richtek	IC BATT CHG MULTI-CHEM 24WQFN	0
RT9750WSC Richtek	IC BATT CHG 42WLCSP	0
RT9467GQW Richtek	IC BATT CHG LI-ION 1CELL 24WQFN	0
RT9519BGQW Richtek	IC BATT CHG LI-ION 1CELL 20WQFN	0
RT9469WSC Richtek	IC BATT CHG LI-ION 1CELL 25WLCSP	0
RT9468GQW Richtek	IC BATT CHG LI-ION 1CELL 32WQFN	0
RT9460WSC Richtek	IC BATT CHG LI-ION 1CELL 25WLCSP	0
RT9470DWSC Richtek	IC BATT CHG LI-ION 1CELL 30WLCSP	0
RT9524GQW Richtek	IC BATT CHG LI-ION 1CELL 10WDFN	4498
RT9527AGQW Richtek	IC BATT CHG LI-ION 1CELL 8WDFN	0
RT9471GQW(2) Richtek	IC BATT CHG LI-ION 1CELL 24WQFN	0
RT9527GQW Richtek	IC BATT CHG LI-ION 1CELL 8WDFN	0
RT9526AGE Richtek	IC BATT CHG LI-ION 1CELL SOT23-6	8374
RT9480GQW-AA03 Richtek	IC BATT CHG LI-ION 1CELL 24WQFN	2935
RT9458WSC Richtek	IC BATT CHG LI-ION 1CELL 20WLCSP	0
RT9535AGQW Richtek	IC BATT CHG MULTI-CHEM 16WQFN	0
RT9519AGQW Richtek	IC BATT CHG LI-ION 1CELL 20WQFN	0
RT9451GQW Richtek	IC BATT CHG LI-ION 1CELL 32WQFN	0
RT9480GQW Richtek	IC BATT CHG LI-ION 1CELL 24WQFN	0
RT9470WSC Richtek	IC BATT CHG LI-ION 1CELL 30WLCSP	0

PMIC - Battery Chargers

1. Overview

Power Management Integrated Circuits (PMIC) with Battery Charger functionality are specialized semiconductor devices that manage power distribution and battery charging processes in electronic systems. These ICs integrate charging algorithms, safety protections, and power path management to optimize energy efficiency and battery lifespan. Their importance in modern technology lies in enabling compact, high-efficiency power solutions for portable electronics, electric vehicles, and IoT devices.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Linear Battery Chargers	Simple topology, low noise, limited efficiency (typically <70%)	Wearable devices, low-power sensors
Switch-Mode Battery Chargers	High efficiency (>90%), supports fast charging protocols	Smartphones, laptops, drones
Multi-Protocol Chargers	Supports USB PD, QC, and proprietary fast charging standards	Universal adapters, power banks
Wireless Battery Chargers	Integrates magnetic induction control and foreign object detection	Smartphones, electric toothbrushes

3. Structure and Components

Typical physical structure includes:

QFN/DFN package (3x3mm to 5x5mm size range)
Internal modules:
- Voltage/current regulation circuits
- Charging algorithm controller (CC-CV, pulsed charging)
- Thermal management unit
- Power MOSFETs (for switch-mode types)
- Communication interface (I2C/SPI for parameter configuration)

4. Key Technical Specifications

Parameter	Typical Range	Importance
Charging Current	100mA-5A	Determines charge time and battery capacity
Voltage Accuracy	0.5%- 2%	Ensures battery longevity and safety
Conversion Efficiency	70%-95%	Impacts thermal performance and battery life
Input Voltage Range	3.7V-24V	Defines compatibility with power sources
Protection Features	OVP/OCP/OTP	Prevents system failures and safety hazards

5. Application Fields

Consumer Electronics: smartphones, tablets, TWS earbuds
Industrial: handheld terminals, robotics, medical devices
Automotive: infotainment systems, battery management for EVs
IoT: smart meters, environmental sensors, security systems

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Texas Instruments	BQ25790	4.5A switch-mode charger with USB PD 3.0 support
Analog Devices	LTC4162	High-voltage battery charger with MPPT algorithm
STMicroelectronics	STBC08	Automotive-grade linear charger with ASIL-B safety rating
NXP Semiconductors	PF1550	PMIC with integrated wireless charging controller

7. Selection Guidelines

Match charging current/voltage requirements with battery specifications
Consider input power source compatibility (USB, AC adapter, solar)
Evaluate required protection features (temperature monitoring, fault reporting)
Check communication interface requirements (I2C register configuration needed?)
Thermal considerations: select package with adequate heat dissipation
Example: For a 10W IoT device, select a 1A linear charger with 1% voltage accuracy

8. Industry Development Trends

Key trends include:

Integration of AI-based charging algorithms for battery aging compensation
Adoption of GaN/SiC transistors for >95% efficiency in fast charging applications
Development of bidirectional chargers for vehicle-to-grid (V2G) applications
Standardization of USB-C Power Delivery as universal charging interface
Miniaturization through 3D packaging technology (stacked die integration)