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Monolithic Power Systems Inc. MP171GJ-P
- Part No.:
- MP171GJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- AC DC Converters, Offline Switches
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP171GJ-P.pdf
- Description:
- IC OFFLIN CONV MULT TOP TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,529
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Product details
Overview
MP171GJ-P from Monolithic Power Systems is a 700 V primary-side constant-voltage (CV) offline regulator with integrated MOSFET, supporting buck/boost/buck-boost/flyback topologies in non-isolated AC/DC conversion. It delivers up to 60 mA output current in CCM, achieves <30 mW no-load power consumption, and incorporates thermal shutdown, OLP, SCP, and open-loop protection. It targets low-power standby supplies in home appliances and white goods.
For engineers reviewing the MP171GJ-P datasheet, MP171GJ-P pinout, MP171GJ-P application, or MP171GJ-P equivalent, this page provides verified technical context, TSOT23-5 package details, CV regulation behavior, green-mode frequency foldback, and real-world design constraints for offline low-power systems.
Technical Context
The MP171GJ-P implements primary-side CV regulation via sampling capacitor feedback without optocoupler, using an internal 2.55 V reference and 6 µs delayed FB sampling after MOSFET turn-off. Its green-mode operation dynamically reduces both peak current (down to ~85 mA) and switching frequency under light load to maintain high efficiency.
It integrates a 700 V, 25 Ω RDS(on) MOSFET with leading-edge blanking (350 ns), supports VCC self-supply from DRAIN, and features auto-restart protection logic for OLP (175 ms delay), SCP (>300 mA threshold), and TSD (150 °C trip with 30 °C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Buck, boost, buck-boost, flyback - enables flexible non-isolated AC/DC designs without transformer isolation |
| Max Output Current | 60 mA in CCM - defines maximum continuous load capability at full input voltage and ambient |
| No-Load Power | <30 mW - meets stringent standby energy requirements for consumer appliances |
| Integrated MOSFET | 700 V breakdown, 25 Ω RDS(on) - eliminates external HV switch and simplifies BOM |
| VCC Operating Range | 5.1–5.8 V with 250 mV hysteresis - ensures stable internal bias during line transients and brownouts |
| FB Reference Voltage | 2.55 V ±100 mV - sets output voltage accuracy via external resistor divider (R1/R2) |
| Thermal Shutdown | 150 °C trip, 120 °C recovery - protects die during sustained overload or poor heatsinking |
Pinout & Package
MP171GJ-P is housed in a 5-pin TSOT23-5 package with exposed drain pad for thermal enhancement. Pin 1 = VCC, Pin 2 = FB, Pins 3–4 = SOURCE (internally tied), Pin 5 = DRAIN. Pins NC are not bonded.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Internal control circuit power supply - must be decoupled with low-ESR capacitor; self-supplied from DRAIN |
| 2 | FB | Primary-side feedback input - samples output via external capacitor; triggers regulation at 2.55 V |
| 3, 4 | SOURCE | MOSFET source and ground reference - common return for VCC and FB; requires low-impedance PCB connection |
| 5 | DRAIN | High-voltage MOSFET drain - connects directly to rectified AC input; carries full primary current and HV stress |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side CV regulation | Eliminates optocoupler and secondary-side TL431, reducing component count and cost in non-isolated supplies |
| Green-mode frequency foldback | Switching frequency decreases with load - maintains >70% efficiency at 10% load and enables <30 mW no-load consumption |
| Integrated 700 V MOSFET | Reduces external parts count by one active device and avoids gate-drive complexity in offline designs |
| Peak current compression | Reduces peak current limit from 105 mA down to ~85 mA at light load - lowers conduction loss and improves light-load efficiency |
| Auto-restart protection suite | OLP (175 ms timer), SCP (>300 mA), TSD (150 °C), open-loop (<0.5 V FB) - ensures robust fault recovery without latch-off |
Applications
| Home Appliance Standby Supply | White Goods Control Logic Power |
|---|---|
Use Scenario: Providing 5 V/50 mA standby power for microcontroller and sensor circuits in washing machines and refrigerators. IC Role / Device Role / Timing Role: Primary-side offline regulator operating in CCM with buck topology, delivering regulated output directly from rectified mains. Use Value: Achieves <30 mW no-load consumption to meet IEC 62301 Ed.2 Class 1 standby limits while maintaining ±5% output regulation across 85–265 VAC input. | Use Scenario: Generating isolated-free 12 V/30 mA auxiliary power for display backlight drivers and UI controllers in ovens and dishwashers. IC Role / Device Role / Timing Role: Flyback-configured primary-side regulator with indirect feedback via auxiliary winding sampling. Use Value: Enables compact, low-cost power stage without optocoupler or secondary-side regulation, meeting EN 55032 Class B EMI with minimal filtering. |
| Consumer Electronics Auxiliary Rail | Industrial Sensor Node Power |
Use Scenario: Supplying 3.3 V/25 mA for Wi-Fi module sleep-state power in smart plugs and IoT hubs. IC Role / Device Role / Timing Role: Boost topology regulator operating in DCM at light load, leveraging frequency foldback for ultra-low idle draw. Use Value: Delivers 25 mA output with <25 mW no-load consumption and fast wake-up response due to internal soft-start and VCC self-bias architecture. | Use Scenario: Powering 5 V/15 mA analog front-end and ADC in battery-less industrial temperature sensors powered from 24 VAC HVAC lines. IC Role / Device Role / Timing Role: Buck-boost configured primary-side regulator handling wide input variation (15–30 VAC RMS) with direct output sensing. Use Value: Maintains regulation across 4:1 input range using programmable FB divider and minimum off-time control, eliminating need for input pre-regulator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary-side offline regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP171A-GJ-Z | Successor with improved EMI performance, tighter FB tolerance (±1%), and enhanced OLP immunity | Recommended for new designs requiring lower radiated emissions and higher output accuracy | Select MP171A-GJ-Z when designing to latest CISPR-32 or FCC Part 15B requirements |
| LNK304DG | 725 V switch, 132 kHz fixed frequency, no frequency foldback, higher no-load power (~65 mW) | Used in legacy designs where constant-frequency operation simplifies EMI filter design | Choose LNK304DG only if existing layout uses fixed-frequency control and thermal margin exceeds 2× MP171GJ-P |
Compared with MP171GJ-P, MP171A-GJ-Z offers tighter regulation and lower EMI but requires updated compensation; LNK304DG provides higher voltage rating and simpler timing but sacrifices light-load efficiency and adds external bias complexity.
Availability
MP171GJ-P is available at Aetrix Electronics and suitable for home appliance standby supplies, white goods control logic power, and consumer electronics auxiliary rails requiring stable component supply and long-term lifecycle support.
Supply support for MP171GJ-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 expertise in DC/DC, AC/DC, and motor driver solutions.
The MP171 product line delivers cost-optimized, integrated primary-side regulators for non-isolated offline power conversion, targeting applications where simplicity, low no-load power, and compact size outweigh the need for secondary-side feedback.
FAQ
What is the recommended minimum off-time for MP171GJ-P in CCM operation?
The MP171GJ-P specifies a minimum off-time of 7.5–12.5 μs, with typical value 10 μs. This parameter directly limits maximum output power in CCM mode and must be respected in inductor selection to avoid saturation and regulation loss at full load.
Can MP171GJ-P operate without an external dummy load?
No - a minimum 3 mA dummy load is required to ensure sufficient inductor energy for sampling capacitor charging and reliable FB voltage detection. Omitting it causes open-loop faults and regulation failure at light or no load.
How does the internal VCC self-supply function during startup?
At power-on, the internal 700 V current source charges the external VCC capacitor from the DRAIN pin until VCC reaches 5.7 V (VCCOFF), triggering IC startup and disabling the HV supply. When VCC drops below 5.5 V (VCCON), the HV supply re-engages to recharge VCC.
What is the purpose of the 6 µs FB sampling delay?
The 6 µs delay after MOSFET turn-off allows freewheeling diode reverse recovery and parasitic ringing to settle before sampling the output voltage on the feedback capacitor. This prevents false regulation errors caused by transient spikes on the FB node.
Why does MP171GJ-P use dual leading-edge blanking times?
It employs 350 ns blanking for normal current limiting and 180 ns for short-circuit protection to distinguish between benign turn-on spikes and true overcurrent events, preventing nuisance tripping during startup or transient load steps.
Is MP171GJ-P RoHS-compliant and halogen-free?
Yes - MP171GJ-P is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU. MPS confirms green status per its Quality Assurance documentation, with material declarations available upon request.
MP171GJ-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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):
- 2 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:
- TSOT-23-5
- Mounting Type:
- Surface Mount
MP171GJ-P FAQ
1.How can I place an order for MP171GJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP171GJ-P 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 MP171GJ-P reliable?
The price and inventory of MP171GJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP171GJ-P is usually 5 days.
3.What payment methods are accepted for MP171GJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP171GJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP171GJ-P?
MP171GJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP171GJ-P 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 MP171GJ-P?
For technical support, including MP171GJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP171GJ-P requirements.
6.How does Aetrix verify that MP171GJ-P is sourced from the original manufacturer or authorized distributors?
All MP171GJ-P 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 MP171GJ-P meets industry standards.
7.What is the process for return or replacement of MP171GJ-P?
All MP171GJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP171GJ-P, 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 MP171GJ-P part is unused and in its original packaging.
Return procedure for MP171GJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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