Monolithic Power Systems Inc. MP163CGS-5-Z

Overview

MP163CGS-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/buck-boost/flyback topologies. It delivers up to 4W output power, achieves <30mW no-load consumption, and features green-mode operation with frequency foldback and peak-current compression for high light-load efficiency - used in home appliance standby power supplies.

For engineers reviewing the MP163CGS-5-Z datasheet, MP163CGS-5-Z pinout, MP163CGS-5-Z application, or MP163CGS-5-Z equivalent, key selection criteria include its 660mA peak current limit, 13.5Ω R_DS(on), SOIC8-7B package, dual-output CV regulation without optocoupler, and integrated thermal/OLP/SCP protection.

Technical Context

The MP163CGS-5-Z implements primary-side constant-voltage control using feedback sampling via an external capacitor (C3) and internal 2.55V reference, eliminating optocoupler dependency. Its green-mode operation dynamically reduces switching frequency and peak current under light load, enabled by programmable minimum off-time (τ_minoff = 9.5–12 μs) and maximum on-time (τ_maxon = 19–24 μs) limits.

It integrates a 700V vertical DMOS power switch with 13.5Ω typical R_DS(on), an internal LDO delivering 5V at up to 150mA continuous output, and comprehensive protection including open-loop detection (V_OLD = 0.4–0.6V), OLP (220ms delay), and thermal shutdown (150°C trip, 30°C hysteresis).

Key Specifications

Pinout & Package

MP163CGS-5-Z is housed in an SOIC8-7B package with exposed drain pad for thermal dissipation. 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 (control circuit supply), Pin 6 is FB (feedback input referenced to SOURCE), Pin 7 is GND (LDO ground), and Pin 8 is OUT (5V LDO output). Pins 3 and 6 are NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP163BGSE-5, MP163CGS-5-Z offers 57% higher peak current in the same SOIC8-7B footprint but trades 0.5Ω higher R_DS(on); versus MP163AGS-5-Z, it doubles output power capability while maintaining identical package and pinout - enabling scalable platform design.

Availability

MP163CGS-5-Z is available at Aetrix Electronics and suitable for home appliance control boards, white goods standby power supplies, and industrial sensor node power requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP163CGS-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 over 20 years of expertise in DC/DC conversion, motor drivers, and AC/DC controllers.

The MP163 product line targets cost-sensitive, low-power offline AC/DC applications in consumer and industrial markets, emphasizing integration, efficiency, and regulatory compliance without sacrificing reliability.

FAQ

What is the maximum continuous output power achievable with MP163CGS-5-Z in buck topology?

The MP163CGS-5-Z supports up to 4W of continuous output power in buck configuration under standard conditions (230VAC input, 25°C ambient, proper heatsinking). This is determined by its 660mA peak current limit, 13.5Ω R_DS(on), and thermal limits - verified in MPS Typical Application Circuit on page 2 of Rev. 1.02 datasheet.

Does MP163CGS-5-Z require an external bootstrap capacitor for gate drive?

No. The MP163CGS-5-Z uses an internally biased VCC supply derived directly from the DRAIN pin via a high-voltage current source, eliminating the need for external bootstrap components. VCC is maintained by a small external capacitor (typically 1–4.7μF), charged only when VCC falls below 5.3V.

Can the integrated LDO be disabled independently of the main regulator?

Yes. The EN pin (Pin 16 on SOIC16 variant) is not present on the SOIC8-7B MP163CGS-5-Z. However, the LDO output (Pin 8) can be disabled by disconnecting its IN pin (Pin 1) from the HV rail - though this also disables the LDO's ability to power downstream circuitry. Full LDO shutdown requires the SOIC16 version with dedicated EN pin.

How does the MP163CGS-5-Z achieve optocoupler-free regulation accuracy?

It uses primary-side sampling: a capacitor (C3) charges to the output voltage during freewheeling diode conduction, then holds that voltage for feedback comparison against the internal 2.55V reference. This method achieves ±5% output regulation across line/load/temperature, validated in MPS Typical Performance Characteristics (page 11, Rev. 1.02).

What is the recommended minimum off-time limit for stable operation at full load?

The MP163CGS-5-Z has a factory-trimmed minimum off-time of 9.5–12 μs (typical 12 μs). For stable full-load operation in CCM, the external inductor must be selected so that τ_minoff does not constrain power delivery - MPS recommends ≥1mH for 12V/200mA output per Typical Application on page 2.

Is the SOIC8-7B package lead-free and RoHS compliant?

Yes. All MP163 variants, including MP163CGS-5-Z, are fully lead-free, halogen-free, and comply with the EU RoHS Directive 2011/65/EU. The "-Z" suffix explicitly denotes tape-and-reel packaging with RoHS-compliant finish, confirmed in MPS Quality Assurance documentation.

What failure modes trigger automatic restart versus latch-off behavior?

Thermal shutdown, OLP, and SCP cause automatic restart after VCC discharges to V_CCpro (2.4–2.8V) and recharges. Open-loop protection and UVLO-induced shutdown also permit auto-restart. Only sustained latch-off occurs if VCC remains below V_CCstop (3.4V) due to external circuit fault - no internal latch mechanism exists.