Monolithic Power Systems Inc. MP163CGSE-5-Z

Overview

MP163CGSE-5-Z from Monolithic Power Systems is a 700V non-isolated offline primary-side regulator with integrated 700V MOSFET and 5V LDO, supporting buck/boost/buck-boost/flyback topologies. It delivers up to 4W output power, achieves <30mW no-load consumption, and provides dual-output CV regulation without optocoupler in home appliance standby supplies.

For engineers reviewing the MP163CGSE-5-Z datasheet, MP163CGSE-5-Z pinout, MP163CGSE-5-Z application, or MP163CGSE-5-Z equivalent, key selection criteria include peak current limit (660mA), R_DS(on) (13.5Ω), thermal shutdown threshold (150°C), green-mode frequency foldback, and SOIC16 package compatibility with high-voltage AC-DC designs.

Technical Context

The MP163CGSE-5-Z implements primary-side constant voltage control using feedback sampling via an external capacitor (C3) and internal 2.55V reference, eliminating optocoupler dependency. Its green-mode operation dynamically reduces both switching frequency and peak current under light load to maintain efficiency.

It integrates a 700V MOSFET with 13.5Ω R_DS(on), a 5V LDO with 150mA continuous output, and comprehensive protection including OLP (220ms delay), SCP (900mA threshold), open-loop detection (0.5V FB threshold), and thermal shutdown with 30°C hysteresis.

Key Specifications

Pinout & Package

MP163CGSE-5-Z 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-Z and MP163CGS-5-Z, MP163CGSE-5-Z uniquely balances 4W capability, SOIC16 thermal performance, and integrated LDO - making it optimal for mid-power white goods requiring both robustness and regulatory compliance.

Availability

MP163CGSE-5-Z is available at Aetrix Electronics and suitable for home appliance control boards, industrial sensor nodes, and consumer electronics standby power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP163CGSE-5-Z 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 feedback.

FAQ

What topology configurations does MP163CGSE-5-Z support?

The MP163CGSE-5-Z supports buck, boost, buck-boost, and flyback topologies per its functional block diagram and typical application schematics. Its primary-side CV control architecture enables all four without optocoupler dependency. Component selection (inductor value, diode rating, feedback divider) must be tailored to each topology's voltage gain and current stress requirements.

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

The integrated 5V LDO accepts input from the main converter's high-side output (e.g., 12V buck rail) and delivers regulated 5V at up to 150mA. Its IN pin connects to that rail, OUT supplies downstream logic, and EN allows external enable/disable. Thermal performance depends on input-to-output voltage drop; adding a series resistor to IN can reduce LDO power dissipation in high-delta-V applications.

What is the purpose of the FB pin's 2.55V reference and sampling capacitor?

The FB pin compares against an internal 2.55V reference to regulate output voltage. An external sampling capacitor (C3) charges during freewheeling diode conduction, holding the output voltage for feedback. This sample-and-hold method enables primary-side regulation without secondary-side sensing, with C3 value selected per Equation (11) in the datasheet to balance light-load regulation and dynamic response.

How does overload protection (OLP) trigger and recover?

OLP triggers when FB voltage falls below 1.7V (for MP163C variant) for 220ms, indicating sustained overcurrent. The IC stops switching, discharges VCC via 16–24µA current source, and restarts only after VCC drops below VCC_pro (2.4–2.8V) and recharges above VCC_ON (5.1–5.3V). This hysteresis prevents chatter during marginal overload conditions.

Can MP163CGSE-5-Z operate without an external dummy load?

A minimum dummy load (~3mA) is required to maintain sufficient inductor energy for the sampling capacitor (C3) to accurately track output voltage during light/no-load conditions. Removing it degrades regulation accuracy and may cause instability. For ultra-low-no-load applications, a Zener diode can replace the resistive dummy load to reduce power loss while preserving regulation integrity.

What is the significance of the 350ns leading-edge blanking (LEB) time?

LEB disables the current comparator for 350ns after MOSFET turn-on to suppress false triggering from parasitic turn-on spikes caused by transformer leakage inductance and diode reverse recovery. This ensures reliable current limiting without premature switch-off, especially critical in flyback and boost topologies with high dV/dt across the drain node.

How does green-mode operation improve efficiency at light loads?

Green-mode reduces both switching frequency and peak current limit as load decreases. Lower frequency extends off-time, reducing switching losses; lower peak current reduces conduction loss per cycle. Together, they cut no-load consumption to <30mW while maintaining regulation - a key advantage over fixed-frequency controllers in standby applications.