Monolithic Power Systems Inc. MP163CGS-5-P

Overview

MP163CGS-5-P from Monolithic Power Systems is a 700V non-isolated offline primary-side regulator with integrated 700V MOSFET (R_DS(on) = 13.5Ω typ), internal LDO (5V output), and green-mode operation. It delivers up to 4W output power in buck/boost/flyback topologies, supports dual-output CV regulation without optocoupler, and targets low-power offline applications including home appliance standby supplies and industrial control auxiliary rails.

For engineers reviewing the MP163CGS-5-P datasheet, MP163CGS-5-P pinout, MP163CGS-5-P application, or MP163CGS-5-P equivalent, key selection criteria include peak current limit (660mA), no-load consumption (<30mW), thermal shutdown threshold (150°C), LDO dropout voltage (620mV at 150mA), and SOIC8-7B package compatibility with primary-side feedback design constraints.

Technical Context

The MP163CGS-5-P implements primary-side constant-voltage control using sampled output voltage via an external RC network on FB, referenced to a 2.55V internal comparator. Its green-mode operation dynamically reduces both switching frequency and peak current under light load, enabling <30mW no-load consumption.

It integrates a 700V vertical DMOS power switch with current-sense capability, an internal LDO (5V/150mA continuous), and comprehensive protection: OLP (220ms delay), SCP (900mA threshold), open-loop detection (0.5V FB threshold), and thermal shutdown (150°C with 30°C hysteresis).

Key Specifications

Pinout & Package

MP163CGS-5-P is housed in a SOIC8-7B package (7-pin variant of SOIC-8 with exposed pad not connected) with creepage-optimized pin spacing for 700V isolation. Thermal resistance θ_JA = 86°C/W enables 1.45W continuous dissipation at +25°C ambient.

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-P delivers 57% higher peak current and lower R_DS(on) in the same SOIC8-7B footprint, enabling higher power density; versus MP163AGS-5, it improves light-load efficiency by extending frequency foldback range and reduces no-load consumption by 12mW through optimized gate drive.

Availability

MP163CGS-5-P is available at Aetrix Electronics and suitable for smart appliance standby supplies, industrial PLC auxiliary rails, and white goods control boards requiring stable component supply with full lifecycle support.

Supply support for MP163CGS-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 over 20 years of leadership in DC/DC conversion and AC/DC regulation.

The MP163 product line delivers highly integrated offline regulators targeting cost-sensitive, space-constrained applications in home appliances and industrial controls where optocoupler elimination and ultra-low standby power are mandatory.

FAQ

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

The MP163CGS-5-P supports up to 4W continuous output power in buck configuration at 25°C ambient with proper heatsinking and SOIC8-7B thermal management. This assumes 12V output at 333mA, 5V output at 800mA, or dual-rail operation with combined load ≤4W. Derating is required above 60°C ambient due to θ_JA = 86°C/W.

Does MP163CGS-5-P require an external startup resistor?

No. MP163CGS-5-P incorporates an internal high-voltage startup current source connected to the DRAIN pin, eliminating the need for an external startup resistor. The IC self-biases from the rectified AC line via DRAIN and charges the VCC capacitor until reaching 5.6V, after which the internal HV regulator turns off.

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

The LDO input (IN pin) is typically connected to the main switching output (e.g., 12V buck rail). It regulates this input down to 5V with 620mV dropout at 150mA. Power dissipation in the LDO scales with (V_IN – 5V) × I_LOAD, so thermal design must account for worst-case input voltage and load current.

Can MP163CGS-5-P operate in discontinuous conduction mode (DCM)?

Yes. MP163CGS-5-P automatically transitions between CCM and DCM based on load. At light loads, frequency foldback extends off-time, forcing DCM operation. The minimum off-time (12μs) and peak-current compression ensure stable regulation down to zero load with <30mW consumption.

What is the purpose of the EN pin, and is it required for basic operation?

The EN pin is present only on SOIC16 variants (e.g., MP163CGSE-5); MP163CGS-5-P (SOIC8-7B) has no EN pin. For SOIC8-7B, the device operates continuously when VCC is within UVLO window. No external enable control is available in this package variant.

How is open-loop protection triggered, and what happens after activation?

Open-loop protection activates when FB voltage drops below 0.5V for >100μs, indicating feedback loop failure or capacitor disconnection. The IC immediately halts switching, discharges VCC via 16μA current source to VCC_pro (2.8V), then restarts once VCC recharges to VCC_OFF (5.6V), implementing auto-recovery without latching.