Monolithic Power Systems Inc. MP175GS-P

Overview

MP175GS-P from Monolithic Power Systems is a 700V primary-side constant-voltage (CV) offline regulator with integrated 700V/4.5Ω MOSFET, supporting buck, buck-boost, boost, and flyback topologies. It delivers up to 600mA output current in CCM, achieves <30mW no-load power consumption, and operates in green-mode with frequency foldback and peak-current compression. It is designed for non-isolated AC/DC conversion in home appliance standby supplies.

For engineers reviewing the MP175GS-P datasheet, MP175GS-P pinout, MP175GS-P application, or MP175GS-P equivalent, key selection criteria include primary-side CV regulation without optocoupler, SOIC-8 package thermal performance (θJA = 76°C/W), 700V drain rating, fixed/adjustable output configuration, and integrated protections including OLP (8192-cycle counter), SCP, OTP, and open-loop detection.

Technical Context

The MP175GS-P implements primary-side CV regulation by sensing output voltage via FB or VCC feedback-enabling optocoupler-free design. Its internal 700V high-voltage current source charges VCC from DRAIN, allowing startup from universal AC input without auxiliary winding.

Green-mode operation dynamically reduces switching frequency and peak current limit under light load: t_minoff = 11.6–16.6μs and I_Limit = 1.02–1.18A at 25°C, with frequency foldback and peak-current compression minimizing audible noise below 20kHz. Protection logic includes BOP (four-cycle max-on-time detection), OLD (V_OLD = 0.2–0.4V), and hysteresis-controlled UVLO (V_CCL = 7–8.7V, V_HVon/V_HVoff = 7.9–9.6V).

Key Specifications

Pinout & Package

MP175GS-P is housed in a standard SOIC-8 package (JEDEC MS-012, variation AA) with exposed DRAIN pads for thermal enhancement. The package features 1.27mm pitch, 3.80–4.00mm width, and 5.80–6.20mm length; recommended land pattern uses 1.60mm pad width and 5.40mm overall length.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP175GS-P, MP174GS-Z trades integration for design flexibility at lower power levels, while LNK3206G offers superior surge handling but sacrifices light-load efficiency-making MP175GS-P optimal for cost- and efficiency-critical 5–10W non-isolated supplies.

Availability

MP175GS-P is available at Aetrix Electronics and suitable for home appliance standby power, white goods control logic, and industrial sensor node power requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP175GS-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 two decades of leadership in DC/DC converters, LED drivers, and AC/DC controllers.

The MP175 product line targets cost-sensitive, non-isolated offline power conversion-designed specifically to replace optocoupler-based feedback in low-power (<10W) home and industrial applications while meeting global energy efficiency mandates.

FAQ

What topology configurations does MP175GS-P support?

The MP175GS-P supports buck, buck-boost, boost, and flyback topologies through primary-side constant-voltage regulation. Its flexible feedback architecture allows VCC-based fixed output or FB-based adjustable output, enabling direct implementation in all four configurations without external controller modification. Pin-level connections remain identical across topologies; only external passive component values change.

How does MP175GS-P achieve <30mW no-load consumption?

MP175GS-P achieves <30mW no-load consumption through green-mode operation: switching frequency and peak current limit scale downward with load, reducing switching and conduction losses. Combined with low VCC operating current (220–400μA in MOSFET-off state) and internally biased VCC regulation, it maintains regulation while minimizing idle power draw across universal AC input ranges.

Can MP175GS-P operate without an external feedback resistor divider?

Yes-MP175GS-P supports fixed-output operation using internal VCC-based feedback. When FB is left unconnected, the internal 500kΩ lower resistor forms a divider with the external VCC capacitor, regulating output to ~18V. This eliminates external resistors and simplifies design for applications requiring a standard output voltage.

What thermal derating applies to MP175GS-P in SOIC-8 package?

In SOIC-8, MP175GS-P has θJA = 76°C/W and θJC = 35°C/W. At 25°C ambient, maximum continuous power dissipation is 1.64W. Derating begins above 25°C at 13.2mW/°C (1.64W ÷ 76°C/W). For 10W output designs, PCB copper area on DRAIN pins and thermal vias to inner layers are mandatory to maintain junction temperature ≤125°C.

How does open-loop detection (OLD) function in MP175GS-P?

OLD monitors FB voltage and triggers shutdown if it falls below 0.2–0.4V, indicating feedback loop failure (e.g., open resistor or disconnected divider). It is disabled when VCC serves as feedback node (internal configuration) because FB remains proportional to VCC and cannot reach the OLD threshold. Dedicated feedback capacitors (Figure 6) are required to enable OLD functionality.

Is MP175GS-P compliant with RoHS and halogen-free standards?

Yes-MP175GS-P is lead-free, halogen-free, and fully compliant with the EU RoHS Directive 2011/65/EU. All packaging materials meet IEC 61249-2-21:2011 requirements, and MPS certifies green status through its Quality Assurance program, with material declarations available upon request.

What protection features are integrated into MP175GS-P?

MP175GS-P integrates six protections: over-temperature protection (OTP) at 150°C, VCC under-voltage lockout (UVLO) with 200mV hysteresis, overload protection (OLP) with 8192-cycle counter, short-circuit protection (SCP) at 135–175% of ILimit, brown-out protection (BOP) triggered after four consecutive max-on-time cycles, and open-loop detection (OLD) at 0.2–0.4V FB threshold.