Monolithic Power Systems Inc. MP163AGS-5-Z

Overview

MP163AGS-5-Z 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 green-mode frequency/peak-current foldback for home appliance standby power supplies.

For engineers reviewing the MP163AGS-5-Z datasheet, MP163AGS-5-Z pinout, MP163AGS-5-Z application, or MP163AGS-5-Z equivalent, this device serves as a compact, optocoupler-free CV controller supporting buck, boost, buck-boost, and flyback topologies in cost-sensitive, low-power AC/DC conversion.

Technical Context

The MP163AGS-5-Z implements primary-side constant voltage regulation using sampled feedback from a secondary-side capacitor, eliminating optocouplers. Its internal error amplifier compares FB voltage to a 2.55V reference, while ramp compensation dynamically adjusts based on load to maintain stability across CCM/DCM transitions.

Green-mode operation is achieved via dual-foldback: switching frequency decreases under light load, and peak current limit compresses as off-time increases-both reducing switching losses and enabling <30mW no-load power consumption without external bias winding.

Key Specifications

Pinout & Package

MP163AGS-5-Z uses the SOIC8-7B package-a 7-pin variant of SOIC-8 with one pin omitted for enhanced high-voltage isolation between DRAIN and SOURCE pins. Thermal resistance θ_JA = 86°C/W supports 1.45W continuous dissipation at +25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP163BGS-5-Z and MP163CGS-5-Z, the MP163AGS-5-Z offers the lowest cost and smallest thermal footprint for sub-4W applications where peak current headroom and ultra-low no-load power are prioritized over maximum output capability.

Availability

MP163AGS-5-Z is available at Aetrix Electronics and suitable for home appliance standby power, white goods control logic, and consumer electronics adapters requiring stable component supply with full RoHS/REACH compliance and lead-free halogen-free construction.

Supply support for MP163AGS-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP163 product line delivers highly integrated, optocoupler-free offline regulators targeting cost-sensitive, low-power AC/DC applications in consumer, appliance, and industrial markets-emphasizing minimal external components and regulatory compliance.

FAQ

What topologies does MP163AGS-5-Z support?

The MP163AGS-5-Z supports buck, boost, buck-boost, and flyback topologies. Its primary-side constant voltage control architecture eliminates the need for optocouplers or secondary-side feedback components, enabling simplified transformerless or isolated designs depending on layout and safety requirements.

How does the integrated LDO function in MP163AGS-5-Z?

The integrated 5V LDO accepts input from the main converter's output (e.g., buck output) and delivers up to 150mA continuous current. It features 620–1100mV dropout voltage, EN pin control, and thermal foldback-enabling local auxiliary rail generation without an external linear regulator.

What protection features are built into MP163AGS-5-Z?

MP163AGS-5-Z includes thermal shutdown (150°C), VCC under-voltage lockout (UVLO), overload protection (220ms delay), short-circuit protection (400mA threshold), and open-loop detection (0.5V FB threshold). All protections trigger automatic restart after fault removal except thermal shutdown, which recovers at 120°C.

Can MP163AGS-5-Z operate without an external VCC capacitor?

No. An external VCC capacitor (typically 1–10µF) is mandatory. The internal HV current source charges it during startup, and the IC stops switching if VCC drops below 3.4V. The capacitor sustains control circuitry during normal operation and enables soft-start timing via controlled charge/discharge cycles.

What is the minimum off-time limit for MP163AGS-5-Z?

The minimum off-time limit is 10μs typical (7.5–12.5μs range), which determines maximum output power in discontinuous conduction mode. This parameter is fixed per variant and cannot be adjusted externally-it governs the shortest allowable MOSFET off period during light-load green-mode operation.

How is output voltage regulated without an optocoupler?

MP163AGS-5-Z uses primary-side sampling: a capacitor on the secondary side charges to the output voltage during freewheeling, then couples that voltage back to the FB pin via a resistive divider. The internal 2.55V reference compares this sampled value to regulate switching duty cycle-achieving ±5% CV accuracy without secondary feedback components.

Is MP163AGS-5-Z suitable for medical-grade power supplies?

No. MP163AGS-5-Z is not certified to IEC 60601-1 or other medical safety standards. It lacks reinforced isolation, creepage/clearance validation for patient-connected applications, and failsafe redundancy required for medical use-intended only for Class II consumer/appliance applications.