Monolithic Power Systems Inc. MP163BGS-5-P

Overview

MP163BGS-5-P 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 420mA peak current limit in SOIC8-7B package. It enables buck/boost/flyback topologies for low-power home appliance standby supplies.

For engineers reviewing the MP163BGS-5-P datasheet, MP163BGS-5-P pinout, MP163BGS-5-P application, or MP163BGS-5-P equivalent, key selection criteria include primary-side CV regulation without optocoupler, integrated LDO for dual-rail support, green-mode frequency foldback, thermal shutdown at 150°C, and SOIC8-7B package compatibility with board-level safety spacing.

Technical Context

The MP163BGS-5-P implements primary-side constant voltage control using sampled feedback from a capacitor (C3) charged during freewheeling diode conduction, eliminating optocoupler dependency. Its internal error amplifier compares FB voltage to a 2.55V reference with 6µs delay after MOSFET turn-off.

It employs green-mode operation: switching frequency and peak current both scale down under light load via frequency foldback and peak-current compression, achieving <30mW no-load power. Protection includes OLP with 220ms delay, SCP threshold at 600mA, and open-loop detection at 0.5V FB.

Key Specifications

Pinout & Package

MP163BGS-5-P uses the SOIC8-7B package (7-pin variant of SOIC-8 with exposed pad), optimized for high-voltage creepage and thermal dissipation in compact offline SMPS layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP163AGS-5, MP163BGS-5-P delivers 100% higher peak current and lower RDS(on) for improved efficiency at mid-load; versus MP163CGS-5, it trades 57% higher peak current for reduced thermal stress and lower no-load consumption in 3–4W applications.

Availability

MP163BGS-5-P is available at Aetrix Electronics and suitable for smart home appliance control, industrial sensor node power, and white goods auxiliary supply requiring stable component supply across multi-year production cycles.

Supply support for MP163BGS-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.

The MP163 product line targets cost-sensitive, low-power offline AC/DC conversion, emphasizing primary-side regulation, integrated power stages, and regulatory compliance for consumer and industrial standby applications.

FAQ

What is the minimum off-time limit for MP163BGS-5-P?

The minimum off-time limit is 12μs typical, adjustable between 9–15μs depending on operating conditions. This parameter directly governs maximum output power in discontinuous conduction mode and stabilizes regulation during light-load green-mode operation.

Does MP163BGS-5-P require an external startup resistor?

No. The device integrates a high-voltage current source connected to the DRAIN pin that self-starts the IC by charging the VCC capacitor from the rectified AC line, eliminating the need for external startup circuitry.

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

The LDO receives its input from the IN pin, typically connected to the buck/boost output rail. It operates independently of the main PWM controller but shares thermal mass; its 150mA continuous rating assumes adequate PCB copper area for heat dissipation.

Can MP163BGS-5-P be used in isolated flyback topology?

Yes - though non-isolated by default, it supports isolated flyback when configured with transformer coupling and primary-side sampling. The FB pin monitors reflected output voltage via an RC network, enabling optocoupler-free isolation with ±3% regulation.

What is the recommended feedback resistor tolerance for stable CV regulation?

Use 1% tolerance metal-film resistors for the FB divider. R2 should be 10kΩ–100kΩ; mismatch >0.5% introduces measurable output voltage drift due to the 2.55V internal reference's temperature coefficient and comparator offset.

How does open-loop protection trigger and recover?

Open-loop protection activates when FB voltage falls below 0.5V, halting switching and initiating automatic restart after VCC discharges to VCCpro (2.8V). Recovery occurs once VCC recharges above VCCON (5.3V), ensuring safe re-engagement only when feedback path integrity is restored.

Is MP163BGS-5-P RoHS and REACH compliant?

Yes - all MP163 variants are lead-free, halogen-free, and fully compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with full material declarations available through MPS's Quality Assurance portal.