PMIC - LED Drivers

Image	Part Number	Description / PDF	Quantity	Rfq
	AS3685A ams	IC LED DRIVER REG AS3685A WLP	0
	AS3635-ZWLT ams	IC LED DRIVER RGLTR 1.05A 9WLCSP	0
	AS3696-ZTQT ams	IC LED DRIVER CTRLR DIM 32TQFP	0
	AS3694A-ZTQ ams	IC LED DRIVER CTRLR DIM 64TQFP	0
	AS3685C-T ams	IC LED DRIVER RGLTR DIM 1A 10DFN	0
	AS3647B-ZWLT-500 ams	IC LED DRIVER REGULATOR 12WLCSP	0
	AS3694A-ZTQT ams	IC LED DRIVER CTRLR DIM 64TQFP	0
	AS3648B-ZWLM ams	IC LED DRIVER REGULATOR 12WLCSP	0
	AS3822-ZTQW ams	IC LED DRIVER LINEAR DIM 32TQFP	0
	AS3674-ZWLT-500 ams	IC LED DRIVER RGLTR DIM 12WLCSP	0
	AS3490 ams	IC LED DRIVER WLP	0
	AS3685A-ZWLT-2Y80 ams	IC LED DRIVER REGULATOR 1A 10DFN	0
	AS3636-ZWLT-500 ams	IC LED DRIVER RGLTR DIM 16WLCSP	0
	AS3824E-ZQFT ams	IC LED DRIVER 48QFN	0
	AS3822-ZTQT ams	IC LED DRIVER LINEAR DIM 32TQFP	0
	AS3824A-ZQFT ams	IC LED DRIVER 48QFN	0
	AS3691B-ZTSP ams	IC LED DRIVER LIN 400MA 20TSSOP	0
	AS3695A ams	IC LED DRVR LIN DIM 120MA 48QFN	0
	AS3685A-ZDFT-2Y80 ams	IC LED DRIVER REGULATOR 1A 10DFN	0
	AS1110-BQFT ams	IC LED DRIVER LINEAR 100MA 28QFN	0

PMIC - LED Drivers

1. Overview

Power Management Integrated Circuits (PMICs) with LED Driver functionality are specialized semiconductor devices designed to regulate and control light-emitting diodes (LEDs) in various applications. These drivers provide precise current control, dimming capabilities, and protection features to ensure optimal LED performance. Their importance in modern technology stems from the widespread adoption of LEDs in energy-efficient lighting, display backlights, and automotive systems due to their compact size, long lifespan, and low power consumption.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Constant Current (CC) Drivers	Maintain stable output current regardless of voltage variations	LED street lighting, industrial lighting systems
Constant Voltage (CV) Drivers	Regulate output voltage with current limiting protection	LED strips, architectural lighting
Multi-channel Drivers	Independent control of multiple LED strings with synchronization	RGB lighting, automotive ambient lighting
Dimming-capable Drivers	Support PWM or analog dimming with wide adjustment range	Smartphone displays, TV backlighting

3. Structure and Components

Typical PMIC LED Driver structure includes: - Semiconductor die with CMOS/Bipolar processes - Power MOSFETs for current regulation - Precision reference voltage circuits - Protection modules (OVP, OCP, OTP) - Control logic for dimming interfaces - Thermal management substrate Packaged in QFN, TSSOP, or WLCSP formats with 16-48 pins depending on channel count and power rating.

4. Key Technical Specifications

Parameter	Description	Importance
Input Voltage Range	4.5V to 40V typical operating range	Determines compatibility with power sources
Output Current Accuracy	2-5% regulation tolerance	Affects LED brightness consistency
Dimming Ratio	1000:1 (PWM) or 20:1 (analog)	Defines brightness control resolution
Efficiency	85-95% typical buck converter efficiency	Impacts thermal performance and battery life
Switching Frequency	200kHz-2MHz adjustable range	Affects EMI and component size

5. Application Areas

Major industries utilizing PMIC LED drivers include: - Consumer Electronics: Smartphones, tablets, TVs - Automotive: Headlights, interior lighting, display backlighting - Industrial: Factory automation lighting, emergency lighting - Medical: Surgical lighting, diagnostic equipment displays - Smart Home: IoT-enabled lighting systems

6. Leading Manufacturers and Products

Manufacturer	Product Family	Key Features
Texas Instruments	TLC59xx series	16-channel PWM control, 12-bit brightness adjustment
STMicroelectronics	LED81XX series	Automotive-grade, ASIL-B safety compliance
ON Semiconductor	Cat4xxx series	Low EMI spread spectrum technology
Infineon Technologies	IMC108 series	Integrated power MOSFETs, 3A per channel

7. Selection Guidelines

Key selection criteria: - Required output current/voltage specifications - Dimming method compatibility (PWM vs analog) - Number of independent channels needed - Package thermal performance requirements - Protection features (IP rating, fault reporting) - Compliance with industry standards (AEC-Q automotive grade) - Cost vs integration level trade-offs

8. Industry Trends

Emerging trends include: - Integration with wireless control (Bluetooth/Zigbee) - Higher integration with MCU cores on single die - Adaptive dimming using AI algorithms - Increased adoption of GaN transistors for higher efficiency - Miniaturization for wearable device applications - Enhanced thermal management solutions for automotive use cases