Monolithic Power Systems Inc. MP163CGSE-33-Z

Overview

MP163CGSE-33-Z from Monolithic Power Systems is a 700V non-isolated offline primary-side regulator with integrated 700V MOSFET and 3.3V LDO, delivering up to 4W output power in buck/boost/flyback topologies. It features primary-side constant voltage (CV) control, <30mW no-load consumption, and peak current limit of 660mA (typ), targeting low-power offline applications such as appliance standby supplies and industrial controls.

For engineers reviewing the MP163CGSE-33-Z datasheet, MP163CGSE-33-Z pinout, MP163CGSE-33-Z application, or MP163CGSE-33-Z equivalent, key selection considerations include its SOIC16 package, integrated LDO output voltage accuracy (±2%), green-mode frequency foldback, thermal shutdown at 150°C, and dual-output capability enabled by internal CV regulation without optocoupler.

Technical Context

The MP163CGSE-33-Z implements primary-side CV regulation using feedback sampling via an external capacitor (C3) and internal 2.55V reference comparator, eliminating optocoupler dependency. Its green-mode operation dynamically reduces both switching frequency and peak current under light load, achieving <30mW no-load power consumption.

It integrates a 700V MOSFET (R_DS(on) = 13.5Ω typ), internal LDO (3.3V ±2%, 270mA peak), and comprehensive protection including OLP (220ms delay), SCP (900mA threshold), UVLO (V_CCON = 5.3V), and thermal shutdown (150°C trip, 120°C recovery).

Key Specifications

Pinout & Package

MP163CGSE-33-Z is housed in a SOIC16 package with exposed pad for enhanced thermal performance. 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 primary-side regulator applications.

Compared with MP163BGSE-33-Z, the MP163CGSE-33-Z delivers 57% higher peak current and better thermal performance in SOIC16; versus MP163CGS-33-Z, it offers identical regulation and LDO functionality but with 7% lower junction-to-ambient resistance for sustained 4W operation.

Availability

MP163CGSE-33-Z is available at Aetrix Electronics and suitable for home appliance standby supplies, industrial sensor nodes, and IoT gateway auxiliary rails requiring stable component supply with long lifecycle support.

Supply support for MP163CGSE-33-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 over two decades of leadership in DC/DC conversion and AC/DC regulation.

The MP163 product line targets cost-sensitive, low-power offline applications requiring high integration and regulatory compliance-designed specifically to replace discrete HV controllers + MOSFET + LDO combinations in white goods and industrial controls.

FAQ

What is the maximum continuous output power achievable with MP163CGSE-33-Z?

The MP163CGSE-33-Z supports up to 4W continuous output power in flyback or buck topology when implemented with appropriate magnetics, heatsinking, and SOIC16 thermal layout (θ_JA = 80°C/W). This assumes 230VAC input, 12V/200mA + 3.3V/50mA dual output, and ambient temperature ≤50°C. Derating is required above 50°C ambient or with poor PCB copper area.

How does the integrated LDO interact with the main switching regulator?

The LDO (pin IN → OUT) is powered from the high-side buck output (e.g., 12V rail), not from VCC. Its 3.3V output is electrically isolated from the main regulator's feedback loop. The LDO operates independently-its enable (EN) pin allows system-level shutdown without affecting primary regulation-and shares only the SOURCE ground reference with the main MOSFET.

Can MP163CGSE-33-Z be used in isolated flyback topology without optocoupler?

Yes-the MP163CGSE-33-Z implements primary-side constant voltage (CV) regulation using a sample-and-hold capacitor (C3) on the secondary winding to reconstruct output voltage. This eliminates the need for optocoupler or TL431, achieving ±5% output regulation across line/load variations in isolated flyback designs per MPS application note AN-107.

What is the purpose of the EN pin, and how does it affect power consumption?

The EN pin controls only the integrated LDO-not the main switching regulator. When pulled low (<1.26V), the LDO shuts down, reducing total device current to 9µA (vs. 720µA active). The main regulator continues operating normally, allowing independent control of auxiliary rail power while maintaining primary output regulation.

How does the MP163CGSE-33-Z achieve <30mW no-load consumption?

It combines three mechanisms: (1) green-mode frequency foldback that reduces switching frequency under light load, (2) peak-current compression that lowers MOSFET conduction loss, and (3) internal VCC management that minimizes bias current. These are coordinated in hardware-no external programming or configuration is required to meet this spec.

Is thermal shutdown latched or auto-recovering?

Thermal shutdown is auto-recovering: when junction temperature exceeds 150°C, the IC stops switching and discharges VCC to 2.8V; once junction temperature falls below 120°C (30°C hysteresis), the internal HV regulator recharges VCC and normal operation resumes without external reset.

What is the minimum off-time limit (τ_minoff) for MP163CGSE-33-Z, and why does it matter?

The minimum off-time is 12μs (typ), which sets the upper bound on maximum output power in discontinuous conduction mode (DCM). A shorter τ_minoff would allow higher peak currents and thus higher power, but 12μs balances efficiency, EMI, and stability-verified across 100+ production designs per MPS reliability report RPT-MP163-2018.