Monolithic Power Systems Inc. MP163CGSE-5-P

Overview

MP163CGSE-5-P from Monolithic Power Systems is a 700V non-isolated offline primary-side regulator with integrated 700V MOSFET and 5V LDO, delivering up to 4W output power, <30mW no-load consumption, and peak current limit of 660mA. It supports buck/boost/flyback topologies in home appliance standby power supplies.

For engineers reviewing the MP163CGSE-5-P datasheet, MP163CGSE-5-P pinout, MP163CGSE-5-P application, or MP163CGSE-5-P equivalent, this page provides verified package mapping (SOIC16), confirmed pin functions, topology-specific design meaning for each parameter, and real-world dual-output use cases with thermal and protection behavior.

Technical Context

The MP163CGSE-5-P implements primary-side constant voltage (CV) regulation using feedback sampling via an external capacitor (C3) and internal 2.55V reference, eliminating optocoupler dependency. Its green-mode operation dynamically reduces switching frequency and peak current under light load to achieve <30mW no-load power.

It integrates a 700V MOSFET with 13.5Ω R_DS(on), internal LDO with 5V output and 150mA continuous current capability, and comprehensive protection including OLP (220ms delay), SCP (900mA threshold), thermal shutdown (150°C), and open-loop detection (0.5V FB threshold).

Key Specifications

Pinout & Package

MP163CGSE-5-P is housed in a SOIC16 package with exposed pad for thermal enhancement. Pin assignments are validated per MPS MP163 Rev. 1.02 datasheet (p.12).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP163BGSE-5 and MP163AGSE-5, the MP163CGSE-5 delivers 57% higher peak current and 15% lower R_DS(on), enabling 4W output in same SOIC16 footprint while maintaining identical pinout, protection set, and LDO functionality.

Availability

MP163CGSE-5-P is available at Aetrix Electronics and suitable for smart appliance standby power, white goods control boards, and IoT gateway auxiliary supplies requiring stable component supply across production lifecycles.

Supply support for MP163CGSE-5-P 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 global design centers and ISO 9001-certified operations.

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 optocouplers.

FAQ

What topology configurations does MP163CGSE-5-P support?

The MP163CGSE-5-P supports buck, boost, buck-boost, and flyback topologies. Its primary-side CV control uses feedback sampling via an external capacitor (C3) rather than secondary-side sensing, enabling optocoupler-free designs. The datasheet provides reference schematics for all four configurations, with component selection guidelines based on target output power and regulation accuracy.

How does the integrated LDO function alongside the main switching regulator?

The integrated LDO accepts input from the main switching output (e.g., 12V buck rail) and delivers a regulated 5V output with up to 150mA continuous current. Its IN pin connects to the high-side output, OUT pin supplies logic circuits, and EN pin allows external enable/disable control. Dropout voltage is 620–1100mV at 150mA, requiring sufficient headroom between input and output voltages.

What protection features are implemented and how do they behave under fault conditions?

MP163CGSE-5-P includes thermal shutdown (150°C trip, 120°C recovery), OLP (220ms timer after FB drops below 1.7V), SCP (900mA threshold with 180ns blanking), and open-loop detection (shutdown if FB < 0.5V). Under fault, the IC stops switching, discharges VCC via 16–24µA current source, and restarts only after VCC falls below VCCpro (2.8V) and fault clears.

Can MP163CGSE-5-P achieve <30mW no-load power consumption in production designs?

Yes - the MP163CGSE-5-P achieves <30mW no-load consumption through green-mode operation: frequency foldback reduces switching frequency, and peak-current compression lowers per-cycle energy at light loads. This is verified in the datasheet's Typical Performance Characteristics (p.11) using 230VAC input, 12V/200mA + 5V/50mA dual output, and proper transformer/inductor selection.

What is the role of the minimum off-time (τ_minoff) parameter in system design?

τ_minoff = 12μs (typical) defines the shortest allowable MOSFET off period, directly limiting maximum switching frequency and determining DCM boundary. It impacts output ripple, inductor sizing, and light-load regulation stability. In soft-start, τ_minoff transitions in two phases (128 cycles each) from τ_{minoff_SS1} to τ_{minoff_SS2} to prevent inrush current overshoot.

How is feedback implemented without an optocoupler?

Feedback uses primary-side sampling: a capacitor (C3) charges to the output voltage via a freewheeling diode during MOSFET off-time, then holds that voltage for the next cycle. The FB pin compares C3 voltage to an internal 2.55V reference; if below threshold, the MOSFET turns on. This eliminates secondary-side components while maintaining ±5% output regulation across line/load variations.

Is MP163CGSE-5-P RoHS-compliant and halogen-free?

Yes - MP163CGSE-5-P is lead-free, halogen-free, and fully compliant with the EU RoHS directive. MPS confirms green status via its Quality Assurance portal, and the device carries the "MPS Green" designation in official documentation and packaging markings.