PMIC - AC DC Converters, Offline Switchers

Part Number	Description / PDF	Quantity
BM2SCQ123T-LBZ ROHM Semiconductor	BM2SCQ123T-LBZ IS A QUASI-RESONA	225
BM2P092 ROHM Semiconductor	IC CONV DC/DC PWM 0.50MA 7DIP	1971
BM2P052 ROHM Semiconductor	IC CONV DC/DC PWM 0.60MA 7DIP	1966
BM1P062FJ-E2 ROHM Semiconductor	IC CONV DC/DC 65KHZ LATCH 8SOIC	1867
BD7684FJ-LBE2 ROHM Semiconductor	LO-NOISE QUASI-RES CTRL DC/DC CO	1497
BM2P032 ROHM Semiconductor	IC CONV DC/DC PWM 0.775MA 7DIP	2000
BM2P134Q-Z ROHM Semiconductor	PWM TYPE DC/DC CONVERTER IC BUIL	1900
BM2P26CK-Z ROHM Semiconductor	THE PWM TYPE DC/DC CONVERTER FOR	2000
BM2P053F-GE2 ROHM Semiconductor	IC CONV DC/DC PWM 650V SOP8	2475
BM2P016T-Z ROHM Semiconductor	PWM TYPE DC/DC CONVERTER	316
BM2SCQ124T-LBZ ROHM Semiconductor	BM2SCQ124T-LBZ IS A QUASI-RESONA	228
BM2P014 ROHM Semiconductor	IC CONV DC/DC PWM 0.950MA 7DIP	0
BM2P0161K-Z ROHM Semiconductor	BM2P0161K-Z THE PWM TYPE DC/DC C	1961
BM1P065FJ-E2 ROHM Semiconductor	IC PWM CTLR AD/DC SOP8	2499
BM2P011 ROHM Semiconductor	IC CONV DC/DC PWM 0.950MA 7DIP	1195
BM2P129TF-E2 ROHM Semiconductor	PWM TYPE DC/DC CONVERTER	2463
BM2P0151-Z ROHM Semiconductor	BM2P0151-Z THE PWM TYPE DC/DC CO	2000
BM1051F-GE2 ROHM Semiconductor	IC COMPOUND LSI PFC/DC-DC SOP24	2000
BM1P101FJ-E2 ROHM Semiconductor	IC CONV DC/DC 100KHZ AUTO 8SOIC	292
BM2P109TF-E2 ROHM Semiconductor	PWM TYPE DC/DC CONVERTER	2493

PMIC - AC DC Converters, Offline Switchers

1. Overview

AC-DC converters and offline switchers are critical subcategories of Power Management Integrated Circuits (PMICs) that convert alternating current (AC) from mains power to direct current (DC) for electronic devices. Offline switchers directly regulate input voltage without requiring a line-frequency transformer, enabling compact and efficient designs. These components are essential in modern electronics for ensuring stable power delivery, energy efficiency, and compliance with global standards like Energy Star and CoC Tier-2.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Flyback Controllers	Isolated topology with energy storage in transformer; suitable for low-to-medium power	Mobile chargers, adapter supplies
Forward Controllers	Higher efficiency for medium-to-high power; requires reset circuitry	Industrial power supplies, telecom rectifiers
Resonant Controllers	ZVS/ZCS techniques for minimal switching losses; high-frequency operation	High-end server PSUs, wireless charging
PFC-Precursors	Boosts power factor to meet regulatory limits; often paired with main converters	Appliances, LED drivers

3. Structure and Components

Typical physical structure includes:

Package Types: DIP, SOP, QFN, or custom power packages
Internal Components:
- Power MOSFET/BJT switches
- PWM/PFM controllers
- Voltage/current feedback circuits
- Protection modules (OVP, OCP, OTP)
- High-voltage startup circuits

Technical composition integrates primary-side regulation (PSR) or secondary-side feedback with optocouplers, often supporting synchronous rectification for efficiency optimization.

4. Key Technical Parameters

Parameter	Description	Importance
Input Voltage Range	85-265V AC or 120-400V DC	Global compatibility and surge tolerance
Output Power	1W-500W depending on topology	Determines application scope
Switching Frequency	20kHz-2MHz	Affects EMI, transformer size, and efficiency
Efficiency	85%-96% (varies with load)	Thermal performance and energy costs
Protection Features	Overvoltage, overcurrent, thermal shutdown	System reliability and safety compliance

5. Application Fields

Consumer Electronics: Phone chargers, notebook adapters, smart home devices
Industrial: Automation equipment, PLCs, test instruments
Medical: Isolated power supplies for diagnostic equipment
Telecom: 48V rectifiers, base station power systems
Automotive: On-board chargers, vehicle AC-DC systems

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Texas Instruments	UCC28780	High-frequency resonant controller with GaN support
STMicroelectronics	L6565	Current-mode flyback controller for adapters
Infineon	ICE3BR1765	Integrated CoolSET for SMPS
ON Semiconductor	NCP1342	Quasi-resonant flyback controller
Monolithic Power Systems	MP44010	Primary-side regulated controller

7. Selection Guidelines

Define input/output requirements (voltage, current, power)
Choose topology based on isolation needs and efficiency targets
Evaluate protection features for mission-critical applications
Consider package thermal performance (e.g., exposed pads)
Verify compliance with standards (UL, CE, FCC)
Balance cost vs. integration level (e.g., controller vs. digital PMIC)

Case Study: For a 65W USB-C laptop adapter, select a high-frequency resonant controller with synchronous rectification to achieve >92% efficiency and compact form factor.

8. Industry Trends

Integration: Combining PFC + LLC stages into single chips
Wide Bandgap: SiC/GaN FETs enabling >1MHz switching
Digital Control: Programmable PMICs with real-time optimization
Green Standards: Meeting EU CoC Tier-2 no-load <10mW requirements
AEC-Q Compliance: Growth in automotive-grade offline converters