Monolithic Power Systems Inc. MP163AGSE-5-P

Overview

MP163AGSE-5-P from Monolithic Power Systems is a 700V non-isolated offline primary-side regulator with integrated 700V MOSFET and 5V LDO, supporting buck/boost/flyback topologies for dual-output CV regulation without optocoupler. It delivers up to 4W output power, achieves <30mW no-load consumption, and features green-mode operation with frequency foldback and peak-current compression. Used in home appliance standby power supplies.

For engineers reviewing the MP163AGSE-5-P datasheet, MP163AGSE-5-P pinout, MP163AGSE-5-P application, or MP163AGSE-5-P equivalent, key selection criteria include its SOIC16 package, 210mA peak current limit, 16Ω R_DS(on), integrated LDO output voltage accuracy (±2%), and primary-side CV control architecture enabling simplified BOMs in cost-sensitive offline AC/DC designs.

Technical Context

The MP163AGSE-5-P implements primary-side constant voltage regulation using feedback sampling via an external capacitor (C3) charged during freewheeling diode conduction, eliminating optocoupler dependency. Its error amplifier samples FB 6µs after MOSFET turn-off against a 2.55V reference, with ramp compensation scaling from ~1mV/µs at full load to exponential increase at light load.

Green-mode operation dynamically reduces both switching frequency and peak current under decreasing load - frequency foldback extends off-time while peak-current compression lowers ILimit - achieving <30mW no-load power. Protection includes VCC UVLO (5.1–5.8V), OLP (1.74V FB threshold, 175ms delay), SCP (400mA threshold), thermal shutdown (150°C), and open-loop detection (FB < 0.5V).

Key Specifications

Pinout & Package

MP163AGSE-5-P is housed in a 16-pin SOIC package (SOIC16) with exposed pad for thermal enhancement. Pin assignments are validated per MPS MP163 Rev. 1.02 datasheet Figure 12 (Pin Functions table).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP163AGSE-5-P, MP163AGS-5 trades EN control and thermal headroom for smaller footprint, while MP163BGSE-5 increases power capability at the cost of higher peak current sensitivity and revised loop compensation requirements.

Availability

MP163AGSE-5-P is available at Aetrix Electronics and suitable for home appliance standby power, industrial sensor node power, and consumer electronics always-on rails requiring stable component supply across multi-year production cycles.

Supply support for MP163AGSE-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP163 product line targets cost-sensitive, low-power offline AC/DC conversion in white goods and consumer electronics, emphasizing integration (HV FET + LDO), efficiency (<30mW no-load), and primary-side regulation to eliminate optocouplers.

FAQ

What is the minimum off-time limit for MP163AGSE-5-P, and how does it affect maximum output power?

The minimum off-time (τ_minoff) is 7.5–12.5µs, directly limiting maximum output power in discontinuous conduction mode (DCM). Per Equation (8), P_max = ½ × L × I_peak² / τ_minoff; thus, shorter τ_minoff allows higher power with fixed inductance and peak current. This parameter is factory-trimmed and not user-adjustable.

Can MP163AGSE-5-P operate without an external VCC capacitor?

No. An external 1–10µF capacitor on the VCC pin is mandatory. The internal HV regulator charges this capacitor from DRAIN during startup and fault recovery. Without it, the IC cannot maintain bias during switching cycles, causing immediate shutdown after initial start-up.

How does the EN pin interact with the integrated LDO's thermal performance?

Driving EN low disables the LDO, reducing total IC quiescent current to 3µA and eliminating LDO conduction loss. This significantly lowers die temperature during standby, improving thermal margin in thermally constrained enclosures - especially critical when IN voltage exceeds OUT by >2V.

What is the purpose of the 350ns leading-edge blanking (LEB) time, and where is it applied?

The 350ns LEB disables the current comparator immediately after MOSFET turn-on to ignore parasitic turn-on spikes from diode reverse recovery and MOSFET drain-source capacitance. It applies only to the primary current sense path (DRAIN-SOURCE), preventing premature cycle termination and ensuring accurate peak-current limiting.

Does MP163AGSE-5-P support synchronous rectification?

No. MP163AGSE-5-P drives only the primary-side MOSFET and provides no gate drive signals for secondary-side synchronous rectifiers. It relies on external freewheeling diodes (e.g., UGC10JH) in buck/boost/flyback configurations, as confirmed in the Typical Application schematic and Operation section.

How is open-loop protection triggered, and what happens after detection?

Open-loop protection activates when FB voltage falls below 0.4–0.6V (typ. 0.5V), indicating feedback network disconnection or failure. The IC halts switching, discharges VCC via 16µA latch-off current, and enters auto-restart mode once VCC drops below V_CCpro (2.4–2.8V), repeating the cycle until fault correction.

What is the recommended dummy load value for MP163AGSE-5-P, and why is it needed?

A 3mA dummy load is recommended across the main output to ensure sufficient inductor energy transfer during light/no-load conditions. This maintains charging of the feedback sampling capacitor (C3), enabling accurate output voltage detection and regulation - critical for achieving <30mW no-load consumption without sacrificing regulation accuracy.