Monolithic Power Systems Inc. MP163BGSE-33

Overview

MP163BGSE-33 from Monolithic Power Systems is a 700V non-isolated offline primary-side regulator with integrated 700V MOSFET (R_DS(on) = 14 Ω), internal LDO (3.3V/270mA peak), and green-mode operation. It delivers up to 4W output power in buck/boost/flyback topologies for low-power offline applications such as appliance standby supplies and industrial control auxiliary rails.

For engineers reviewing the MP163BGSE-33 datasheet, MP163BGSE-33 pinout, MP163BGSE-33 application, or MP163BGSE-33 equivalent, key selection criteria include its 420mA peak current limit, SOIC16 package thermal resistance (θ_JA = 80°C/W), 30mW no-load consumption, dual-output CV regulation without optocoupler, and integrated OLP/SCP/thermal shutdown protection.

Technical Context

The MP163BGSE-33 implements primary-side constant voltage (CV) control using feedback sampling via an external capacitor (C3) and internal 2.55V reference comparator. Its green-mode operation dynamically reduces switching frequency and peak current under light load to maintain high efficiency down to no-load conditions.

It integrates a 700V vertical DMOS power switch with leading-edge blanking (180ns), programmable minimum off-time (12μs typical), and ramp compensation for stable CCM/DCM transition. The internal LDO accepts input from the main converter's high-side rail and regulates 3.3V output with 620–1100mV dropout at 150mA.

Key Specifications

Pinout & Package

MP163BGSE-33 is housed in a 16-pin SOIC package (7.5mm × 10.3mm, 1.27mm pitch) with exposed pad for thermal enhancement. Pin 15 is IN (LDO input), Pin 11 is SOURCE (MOSFET source and system ground reference), Pin 8 is DRAIN (700V MOSFET drain), Pin 9 is VCC (control supply), Pin 10 is FB (2.55V reference feedback), Pin 1/4/14 are GND (LDO ground), Pin 3 is OUT (3.3V LDO output), Pin 16 is EN (logic-enable input), and Pins 2/5/6/7/12/13 are NC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar offline primary-side regulator applications.

Compared with MP163BGS-33, MP163BGSE-33 offers enable control and better thermal headroom; compared with MP163CGSE-33, it trades peak power capability for cost optimization in 4W-class designs.

Availability

MP163BGSE-33 is available at Aetrix Electronics and suitable for home appliance control boards, industrial PLC auxiliary supplies, and smart energy meter standby rails requiring stable component supply across multi-year production cycles.

Supply support for MP163BGSE-33 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan.

The MP163 product line targets cost-sensitive, low-power offline AC/DC conversion in consumer and industrial applications, emphasizing integration, efficiency, and regulatory compliance without optical isolation.

FAQ

What topology does MP163BGSE-33 support?

The MP163BGSE-33 supports buck, boost, buck-boost, and flyback topologies through primary-side constant voltage regulation. Its integrated 700V MOSFET and internal current sense enable direct implementation in all four configurations without external high-voltage components. Designers select topology based on required output voltage range and isolation needs - flyback for isolated outputs, buck for step-down non-isolated rails.

How does the integrated LDO function in dual-output designs?

The LDO accepts input from the main converter's high-side output (e.g., 12V buck rail) and regulates a clean 3.3V output with 270mA peak current. Its dedicated GND pins (1,4,14) isolate LDO return from power ground, minimizing noise coupling into sensitive digital circuits. Dropout voltage is 620–1100mV at 150mA, requiring ≥4.3V input for stable 3.3V regulation.

What is the purpose of the EN pin on MP163BGSE-33?

Pin 16 (EN) provides logic-level enable/disable control for the integrated LDO only - it does not disable the main HV regulator. Driving EN high (>1.48V) activates the 3.3V LDO output; driving it low (<1.26V) shuts down the LDO with 9µA quiescent current. This allows independent power sequencing of auxiliary rails while maintaining main converter operation for system wake-up functions.

How is no-load power consumption minimized?

No-load consumption is reduced via green-mode operation: switching frequency and peak current both decrease under light load, and the internal HV regulator enters low-current charge mode. Combined with 720µA active ICC and 9µA shutdown current, this achieves <30mW no-load power. An external resistor on the IN pin can further reduce LDO thermal stress when input-to-output differential exceeds 5V.

What protection features are implemented in hardware?

MP163BGSE-33 includes five hardware protections: thermal shutdown (150°C trip, 120°C recovery), VCC under-voltage lockout (5.3V turn-on, 5.6V turn-off), overload protection (220ms timer after FB drops below 1.74V), short-circuit protection (600mA threshold), and open-loop detection (shutdown if FB < 0.5V). All operate independently of external components and respond within microseconds to milliseconds.

Can MP163BGSE-33 replace optocoupler-based feedback designs?

Yes - MP163BGSE-33 eliminates the optocoupler and secondary-side TL431 by implementing primary-side CV regulation via sampling capacitor (C3) and internal 2.55V reference. It achieves ±3% output regulation across line/load/temperature without secondary feedback, reducing component count, cost, and failure points while maintaining safety isolation through transformer design rather than feedback path.

What is the significance of the SOIC16 package choice?

The SOIC16 package provides 1.56W continuous power dissipation (θ_JA = 80°C/W) - 7.6% higher than SOIC8-7B - enabling full 4W output in thermally constrained environments. Its larger footprint accommodates dedicated GND pins for LDO noise isolation and includes EN functionality absent in the SOIC8 variant, supporting advanced power sequencing in complex systems.