Monolithic Power Systems Inc. MP163AGSE-5-Z

Overview

MP163AGSE-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/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-Z datasheet, MP163AGSE-5-Z pinout, MP163AGSE-5-Z application, or MP163AGSE-5-Z 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, cost-effective offline AC/DC conversion.

Technical Context

The MP163AGSE-5-Z implements primary-side constant-voltage regulation using feedback sampling via an external capacitor (C3) charged during freewheeling diode conduction, referenced to a 2.55V internal error amplifier threshold. Its green-mode operation dynamically reduces switching frequency and peak current under light load to maintain high efficiency.

It integrates a 700V vertical DMOS power switch with 16Ω typical R_DS(on), an internal LDO delivering 5V ±2% at up to 150mA continuous output, and comprehensive protection including OLP (1.74V FB threshold, 175ms delay), SCP (400mA threshold), thermal shutdown (150°C), and open-loop detection (0.5V FB threshold).

Key Specifications

Pinout & Package

MP163AGSE-5-Z is housed in a 16-pin SOIC package with exposed thermal pad (SOIC16), offering θ_JA = 80°C/W and θ_JC = 35°C/W for improved thermal management in compact offline power supplies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP163AGSE-5-Z, MP163AGS-5-Z offers identical regulation performance in a smaller SOIC8-7B footprint but reduced thermal capability, while MP163BGSE-5-Z delivers higher output power and efficiency at the cost of slightly higher quiescent current - enabling scalable design across 2W to 4W appliance power tiers.

Availability

MP163AGSE-5-Z is available at Aetrix Electronics and suitable for home appliance standby power, IoT sensor hub power, and industrial panel PC auxiliary supply requiring stable component supply, RoHS-compliant sourcing, and long-term production continuity.

Supply support for MP163AGSE-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, and global manufacturing partnerships.

The MP163 product line targets cost-sensitive, low-power offline AC/DC conversion in consumer and industrial applications, emphasizing integration (HV MOSFET + LDO + control), regulatory compliance (CoC/DoE), and simplified system design.

FAQ

What topology configurations does MP163AGSE-5-Z support?

The MP163AGSE-5-Z supports buck, boost, buck-boost, and flyback topologies in non-isolated configurations. Its primary-side CV control architecture uses feedback sampling from the output via a capacitor coupled through a diode, eliminating the need for optocouplers or secondary-side references. Designers select topology based on input/output voltage relationship and isolation requirements - buck for step-down, flyback for limited isolation needs.

How does the integrated LDO function in relation to the main regulator output?

The integrated 5V LDO accepts its input (IN pin) from the main converter's high-side output rail (e.g., 12V buck output) and delivers a regulated 5V output (OUT pin) with ±2% accuracy. It operates independently of the main switching loop, drawing current only from the IN rail. Its 150mA continuous rating and 270mA peak limit make it suitable for powering MCUs, sensors, or communication interfaces without requiring a separate regulator.

What is the purpose of the EN pin, and how should it be used?

The EN pin controls the integrated LDO only - driving it high (>1.48V) enables the 5V LDO output, while pulling it low (<1.26V) disables it with 9µA shutdown current. It does not affect the main HV regulator operation. This enables system-level power sequencing, such as delaying MCU power-up until main rail stabilization, or disabling auxiliary power during deep sleep modes to minimize total system standby consumption.

Can MP163AGSE-5-Z achieve <30mW no-load power consumption in practice?

Yes - the MP163AGSE-5-Z achieves <30mW no-load consumption through green-mode operation: switching frequency and peak current both decrease under light load, minimizing switching and conduction losses. This is validated in MPS test data (MP163CGS-5, 230VAC input) and confirmed across all variants including MP163AGSE-5-Z when using recommended input capacitance, inductor value, and dummy load (e.g., 3mA Zener-based load).

What are the critical layout considerations for stable MP163AGSE-5-Z operation?

Critical layout practices include: (1) short, low-inductance paths for DRAIN-SOURCE loop to minimize ringing; (2) separate GND pours for LDO (pins 1/4/14) and SOURCE (pin 11) with single-point connection near IC; (3) 1–10µF ceramic VCC capacitor placed within 3mm of VCC/GND pins; (4) FB trace routed away from noisy nodes and shielded by ground pour; (5) thermal pad of SOIC16 package soldered to ≥2cm² copper area for θ_JA optimization.

How does open-loop protection work, and when is it triggered?

Open-loop protection triggers when FB voltage falls below 0.5V (typical), indicating loss of feedback signal - e.g., due to open feedback resistor, disconnected sampling capacitor, or failed output rectifier. The IC halts switching and initiates automatic restart after VCC discharges to VCC_pro (2.8V) and recharges. During soft-start, this protection is blanked to prevent false triggering before regulation stabilizes.

Is MP163AGSE-5-Z suitable for universal AC input (85–265VAC)?

Yes - the integrated 700V MOSFET and internal HV startup circuit enable direct operation from universal AC input after bridge rectification. Designers must size the input capacitor per topology (e.g., 1.5–2µF/W for full-wave rectifier) and select inductor/transformer turns ratio to ensure sufficient peak current margin at 85VAC low-line condition while avoiding saturation at 265VAC high-line.