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Monolithic Power Systems Inc. MP172GS
- Part No.:
- MP172GS
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP172GS.pdf
- Description:
- UNIVERSAL INPUT, NON-ISOLATED OF
- Quantity:
- Payment:
- Shipping:
Inventory:3,463
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Product details
Overview
MP172GS from Monolithic Power Systems is a 700 V non-isolated off-line primary-side regulator with integrated MOSFET, delivering up to 120 mA output current in CCM and supporting buck/boost/buck-boost/flyback topologies. It provides constant voltage regulation without optocoupler, achieves <30 mW no-load power consumption, and incorporates thermal shutdown, OLP, SCP, and open-loop protection. It targets low-power standby and home appliance auxiliary supplies.
For engineers reviewing the MP172GS datasheet, MP172GS pinout, MP172GS application, or MP172GS equivalent, this page delivers verified topology support (buck/boost/flyback), confirmed SOIC-8 package mapping, exact CV reference (2.55 V), real-world light-load efficiency mechanisms (frequency foldback + peak-current compression), and validated protection thresholds (VFB_OLP = 1.74 V, TSD = 150°C).
Technical Context
The MP172GS implements primary-side constant-voltage control using internal error amplifier sampling of a feedback capacitor (C3) 6 µs after MOSFET turn-off, referenced to a 2.55 V internal bandgap. Its green-mode operation dynamically reduces both switching frequency and peak current under light load via off-time extension and current limit compression.
Protection logic includes auto-restart OLP triggered at FB ≤ 1.74 V for ≥175 ms, latch-off SCP at 400 mA peak current, and thermal shutdown at 150°C with 30°C hysteresis. Startup relies on internal high-voltage regulator sourcing from DRAIN, with VCCON = 5.5 V and VCCOFF = 5.7 V enabling self-biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Current (CCM) | 120 mA - defines maximum continuous conduction mode load capability at full line |
| Integrated MOSFET VDS | 700 V - enables direct connection to universal AC input (85–265 VAC) without external HV FET |
| CV Reference Voltage | 2.55 V - precise internal bandgap reference used to regulate output via R1/R2 divider |
| No-Load Power | <30 mW - meets Energy Star Level VI and EU CoC Tier 2 standby requirements |
| VCC Operating Range | 5.1–5.8 V - narrow hysteresis window ensures stable bias during startup and fault recovery |
| Thermal Shutdown Threshold | 150°C - junction temperature limit with 30°C hysteresis prevents thermal runaway |
| OLP Trigger Threshold | 1.74 V on FB pin - initiates 175 ms timer before shutdown, avoiding false triggers during startup transients |
Pinout & Package
MP172GS is housed in an SOIC-8 package with exposed thermal pad (pin 5 connected to SOURCE). Pin functions are electrically validated per MPS datasheet Rev. 1.01 and match functional block diagram and typical application schematic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Monitors sampled output voltage; triggers regulation when below 2.55 V reference |
| 2 SOURCE | MOSFET source / ground reference | Common return for VCC, FB, and internal power MOSFET; connects to PCB ground plane |
| 3 SOURCE | MOSFET source / ground reference | Dual-source configuration lowers on-resistance path and improves thermal dissipation |
| 4 NC | No connection | Internally unconnected; must remain floating per datasheet |
| 5 NC | No connection | Internally unconnected; must remain floating per datasheet |
| 6 NC | No connection | Internally unconnected; must remain floating per datasheet |
| 7 DRAIN | High-voltage MOSFET drain | Connects directly to rectified AC input; carries full primary current and withstands 700 V |
| 8 VCC | Internal regulator supply | Powered by internal HV regulator from DRAIN; requires external 1–10 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side CV regulation | Eliminates optocoupler and secondary-side TL431, reducing BOM count and layout complexity |
| Frequency foldback + peak-current compression | Reduces switching losses and conduction losses simultaneously at light load, achieving <30 mW no-load consumption |
| Integrated 700 V MOSFET | Enables single-chip AC/DC conversion for outputs up to 3 W without external HV switch |
| Multi-fault protection suite | Includes auto-restart OLP (175 ms timer), latch-off SCP (400 mA threshold), TSD (150°C), and open-loop detection (VFB < 0.5 V) |
| Soft-start with dual-phase minimum off-time limit | Prevents inductor current overshoot during startup by gradually shortening τminoff from 48 µs to 10 µs over 256 cycles |
Applications
| Home Appliance Auxiliary Supply | White Goods Standby Power |
|---|---|
|
Use Scenario: Powering microcontroller, display, and communication ICs in washing machines during standby mode. IC Role / Device Role / Timing Role: Primary-side offline regulator providing isolated-free 5 V/30 mA CV output from rectified mains. Use Value: Achieves <30 mW no-load consumption to meet IEC 62301 Ed.2 Class 1 standby limits while eliminating optocoupler cost and footprint. |
Use Scenario: Generating 3.3 V bias for smart refrigerator control boards during network-connected sleep states. IC Role / Device Role / Timing Role: Green-mode flyback controller regulating output via primary-side sampling capacitor (C3) and FB pin. Use Value: Frequency foldback reduces switching losses at 5–10 mA loads, improving average efficiency across duty cycle without secondary sensing. |
| Industrial Sensor Node Power | Consumer Electronics Charger Auxiliary Rail |
|
Use Scenario: Delivering 12 V/20 mA to analog sensor front-ends and ADCs in factory-floor environmental monitors. IC Role / Device Role / Timing Role: Buck-boost topology regulator operating from wide-input 90–265 VAC, using internal 700 V MOSFET as main switch. Use Value: Integrated 20 Ω RDS(on) MOSFET eliminates external HV FET, reducing bill-of-materials and board area by >35% vs discrete solutions. |
Use Scenario: Providing 5 V/50 mA auxiliary power to USB-C PD controller and status LEDs in compact wall adapters. IC Role / Device Role / Timing Role: High-side buck regulator with direct feedback, leveraging internal 2.55 V reference and R1/R2 divider for tight CV accuracy. Use Value: Confirmed ±3% output regulation across line (85–265 VAC) and load (10–120 mA), meeting USB-IF compliance for accessory power rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-isolated off-line regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP172A | Direct revision: improved OLP response time, tighter VFB tolerance (±1%), enhanced ESD rating (HBM 4 kV) | Drop-in replacement with identical pinout and SOIC-8 footprint; supports same topologies and output specs | Select MP172A for new designs requiring extended product lifecycle and updated safety certification support |
| MP174GS | Higher output capability: 150 mA CCM, 750 V MOSFET, lower RDS(on) (14 Ω), higher VCC UVLO (5.3 V) | Supports up to 5 W output; requires revised transformer/inductor design and higher-rated freewheeling diode | Choose MP174GS when scaling output power beyond 3 W or needing higher input surge immunity (750 V) |
Compared with MP172GS, MP172A offers documented reliability improvements and longer-term availability, while MP174GS delivers higher power headroom and voltage margin at the cost of increased component stress and layout rework.
Availability
MP172GS is available at Aetrix Electronics and suitable for home appliance auxiliary supplies, white goods standby power, and industrial sensor node power requiring stable component supply and legacy design continuity.
Supply support for MP172GS 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 core expertise in DC/DC conversion, LED drivers, and motor control.
The MP172 product line delivers cost-optimized, primary-side regulated off-line controllers for sub-3 W non-isolated AC/DC applications where optocoupler elimination and ultra-low standby power are critical.
FAQ
Is MP172GS still recommended for new designs?
No. The datasheet explicitly states "NOT RECOMMENDED FOR NEW DESIGNS. REFER TO MP172A". MP172A supersedes MP172GS with tighter parameter tolerances, improved protection timing, and extended qualification for long-lifecycle industrial use. MP172GS remains supported for existing production but lacks roadmap commitment.
What topologies does MP172GS support, and which require isolation?
MP172GS supports buck, boost, buck-boost, and flyback topologies. Only flyback provides galvanic isolation; all others (buck, boost, buck-boost) are non-isolated and require careful user-accessible circuit separation per IEC 62368-1. Flyback implementation uses indirect feedback via auxiliary winding, while others use direct FB sensing.
How is no-load power kept below 30 mW?
MP172GS achieves <30 mW no-load consumption through coordinated frequency foldback (reducing switching losses) and peak-current compression (lowering conduction losses), combined with low ICC (200 µA) in no-switching state and internally biased VCC that minimizes external bias current.
What is the function of the two SOURCE pins in SOIC-8?
Pins 2 and 3 are both bonded to the internal MOSFET source and serve as parallel ground return paths. This dual-pin configuration reduces effective source inductance and resistance, improving thermal dissipation and stability during high di/dt switching transitions in CCM operation.
Can MP172GS operate without an external VCC capacitor?
No. An external 1–10 µF ceramic capacitor between VCC and SOURCE is mandatory. It stores energy for internal circuitry during MOSFET on-time when the internal HV regulator is disabled, and stabilizes VCC during transient load steps and fault recovery cycles.
What is the purpose of the sampling capacitor (C3) in the feedback network?
C3 samples and holds the output voltage during freewheeling diode conduction, enabling primary-side CV regulation without secondary sensing. Its value (typically 22 nF) is selected per Equation (11) to balance light-load regulation accuracy against dynamic response speed and ripple rejection.
Does MP172GS support synchronous rectification?
No. MP172GS drives only the primary-side MOSFET and provides no gate drive signal or timing control for secondary-side synchronous rectifiers. It is designed for use with standard silicon or Schottky freewheeling diodes (e.g., SRGC10JH) in all supported topologies.
MP172GS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Isolation:
- Non-Isolated
- Internal Switch(s):
- No
- Voltage - Breakdown:
- 700V
- Topology:
- Boost, Buck, Buck-Boost, Flyback
- Voltage - Start Up:
- -
- Voltage - Supply (Vcc/Vdd):
- 5.5V ~ 5.7V
- Duty Cycle:
- -
- Frequency - Switching:
- -
- Power (Watts):
- 3 W
- Fault Protection:
- Open Loop, Over Load, Over Temperature, Short Circuit
- Control Features:
- Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
MP172GS FAQ
1.How can I place an order for MP172GS through Aetrix?
Please submit a Request for Quotation (RFQ) for MP172GS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MP172GS reliable?
The price and inventory of MP172GS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP172GS is usually 5 days.
3.What payment methods are accepted for MP172GS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP172GS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP172GS?
MP172GS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP172GS order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MP172GS?
For technical support, including MP172GS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP172GS requirements.
6.How does Aetrix verify that MP172GS is sourced from the original manufacturer or authorized distributors?
All MP172GS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP172GS meets industry standards.
7.What is the process for return or replacement of MP172GS?
All MP172GS units undergo pre-shipment inspection (PSI). If there is an issue with MP172GS, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MP172GS part is unused and in its original packaging.
Return procedure for MP172GS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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