Monolithic Power Systems Inc. MP163AGS-33-Z

Overview

MP163AGS-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 210mA peak current limit, 16Ω R_DS(on), <30mW no-load consumption, and green-mode frequency foldback for home appliance standby power supplies.

For engineers reviewing the MP163AGS-33-Z datasheet, MP163AGS-33-Z pinout, MP163AGS-33-Z application, or MP163AGS-33-Z equivalent, this device serves as a compact, optocoupler-free CV regulator for dual-output offline converters where high-voltage integration, light-load efficiency, and thermal robustness are critical.

Technical Context

The MP163AGS-33-Z implements primary-side constant voltage regulation using sampled feedback from a secondary-side capacitor, eliminating optocouplers. Its internal 700V MOSFET operates with peak-current mode control, minimum off-time limiting (10μs typ), and maximum on-time clamping (18μs typ) to stabilize switching across load transients.

Green-mode operation dynamically reduces both switching frequency and peak current under light loads, enabled by internal ramp compensation and leading-edge blanking (350ns). Protection includes thermal shutdown at 150°C, VCC UVLO (5.1–5.8V), OLP (1.74V FB threshold, 175ms delay), SCP (400mA threshold), and open-loop detection (<0.5V FB).

Key Specifications

Pinout & Package

MP163AGS-33-Z is housed in a SOIC-8-7B package (7-pin variant with pin 3 omitted), thermally enhanced for offline regulator applications. Pin 1 is IN (LDO input), Pin 2 is SOURCE (MOSFET source and system ground reference), Pin 4 is DRAIN (700V MOSFET drain and HV current source), Pin 5 is VCC (internal bias supply), Pin 6 is FB (2.55V reference feedback input), Pin 7 is GND (LDO ground), and Pin 8 is OUT (3.3V LDO output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP163BGS-33-Z and MP163CGS-33-Z, the MP163AGS-33-Z offers optimal balance of cost, size, and light-load efficiency for sub-4W standby applications-its lower peak current and higher R_DS(on) reduce silicon cost while maintaining <30mW no-load consumption critical for energy certification.

Availability

MP163AGS-33-Z is available at Aetrix Electronics and suitable for smart home appliances, industrial control panels, and white goods requiring stable component supply with long lifecycle support and RoHS-compliant packaging.

Supply support for MP163AGS-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP163 product line targets cost-sensitive, space-constrained offline AC/DC conversion in consumer and industrial equipment, emphasizing integration, efficiency, and regulatory compliance without external optocouplers or discrete HV components.

FAQ

What is the maximum continuous output power achievable with MP163AGS-33-Z?

The MP163AGS-33-Z supports up to 4W of continuous output power in buck, boost, buck-boost, or flyback configurations. This limit arises from its 210mA peak current capability, 16Ω R_DS(on), and thermal design in the SOIC-8-7B package, validated across -40°C to +125°C junction temperature range.

Does MP163AGS-33-Z require an external optocoupler for regulation?

No. The MP163AGS-33-Z uses primary-side constant voltage regulation with internal sampling of the output voltage via a feedback capacitor on the secondary side. This eliminates the need for an optocoupler or secondary-side shunt regulator, reducing BOM cost and improving long-term reliability.

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

The integrated 3.3V LDO accepts input from the main converter's high-side output (e.g., 12V buck rail) and delivers up to 390mA peak current. Its dropout voltage is ≤1.1V at 150mA, enabling stable logic rail generation without a separate DC-DC stage-critical for minimizing component count in appliance mainboards.

What protection mechanisms prevent damage during short-circuit events?

MP163AGS-33-Z incorporates dedicated short-circuit protection (SCP) that triggers at 400mA peak current. Upon detection, the MOSFET shuts down immediately, and the IC enters latch-off mode with 16–24μA VCC discharge current. Recovery occurs automatically after VCC discharges to 2.4–2.8V and restarts via internal soft-start sequence.

Can MP163AGS-33-Z operate with universal AC input (85–265VAC)?

Yes. With its 700V integrated MOSFET and internal HV startup circuit, the MP163AGS-33-Z supports universal AC input when paired with appropriate bridge rectifier and input capacitor (e.g., 2–3µF/W for half-wave rectification). Design examples in the datasheet confirm stable operation across this range in buck and flyback topologies.

Is thermal derating required for SOIC-8-7B mounting on standard FR-4 PCB?

Yes. The SOIC-8-7B package has θ_JA = 86°C/W on a 4-layer PCB per JESD51-7. At 25°C ambient, maximum continuous power dissipation is 1.45W. For 4W output applications, thermal relief pads, copper pour under the SOURCE pad, and airflow must be implemented to maintain T_J ≤ 125°C per recommended operating conditions.

What is the purpose of the EN pin, and is it present on MP163AGS-33-Z?

The EN pin enables external control of the integrated LDO. However, MP163AGS-33-Z uses the SOIC-8-7B package, which omits the EN pin (it is only available on SOIC-16 variants like MP163AGSE-33-Z). In the -Z version, the LDO is always enabled when VCC is valid and no external enable signal is supported.