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Monolithic Power Systems Inc. MP172AGJ-Z
- Part No.:
- MP172AGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- AC DC Converters, Offline Switches
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP172AGJ-Z.pdf
- Description:
- IC OFFLIN CONV MULT TOP TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,050
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Product details
Overview
MP172AGJ-Z from Monolithic Power Systems is a 700V primary-side offline regulator IC with integrated MOSFET, delivering up to 120mA output current in CCM and supporting buck/boost/buck-boost/flyback topologies. It enables non-isolated, low-power AC/DC conversion for home appliances and standby power supplies, featuring optocoupler-free constant-voltage regulation, <30mW no-load consumption, and green-mode frequency foldback.
For engineers reviewing the MP172AGJ-Z datasheet, MP172AGJ-Z pinout, MP172AGJ-Z application, or MP172AGJ-Z equivalent, key selection criteria include its TSOT23-5 package footprint, 700V drain rating, 2.55V FB reference, thermal shutdown at 150°C, and compatibility with universal AC input (85–265VAC) in cost-sensitive embedded power designs.
Technical Context
The MP172AGJ-Z implements primary-side CV control using internal sampling capacitor feedback and an error amplifier referenced to 2.55V, eliminating optocouplers. Its integrated 700V/20Ω MOSFET supports direct high-voltage switching, while peak-current-limited PWM with 350ns leading-edge blanking ensures robust operation under transient load and short-circuit conditions.
Green-mode operation dynamically reduces both switching frequency and peak current as load decreases-enabling <30mW no-load power and high light-load efficiency. Protection logic includes auto-restart OLP (175ms delay), SCP (440mA threshold), open-loop detection (0.5V FB threshold), and thermal shutdown with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain Voltage Rating | 700V - Enables direct connection to rectified universal AC input without external HV FET. |
| Max Output Current (CCM) | 120mA - Supports up to 3W output power in continuous conduction mode. |
| FB Reference Voltage | 2.55V ±0.1V - Sets regulated output voltage via resistor divider (e.g., 5V @ R1=41.2kΩ, R2=39.2kΩ). |
| No-Load Power Consumption | <30mW - Meets stringent standby power requirements for energy-efficient appliances. |
| Thermal Shutdown Threshold | 150°C - Protects die during sustained overload; recovers at 120°C (30°C hysteresis). |
| VCC Operating Range | 5.1V–5.8V - Internal bias supply with 250mV hysteresis prevents oscillation near UVLO threshold. |
| Short-Circuit Threshold | 440mA typical - Triggers immediate shutdown to prevent transformer saturation and diode stress. |
Pinout & Package
MP172AGJ-Z is housed in a 5-pin TSOT23-5 package (JEDEC MO-193 AA), optimized for compact, high-voltage AC/DC converters. The exposed pad is not electrically connected but aids thermal dissipation when soldered to copper.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Internal regulator power supply; charges from DRAIN via high-voltage current source; triggers UVLO at 5.1V. |
| 2 | FB | Feedback input; monitors sampled output voltage; comparator trips at 2.55V reference for CV regulation. |
| 3 & 4 | SOURCE | Internal MOSFET source terminal; serves as ground reference for VCC and FB pins; tied to PCB GND. |
| 5 | DRAIN | High-voltage MOSFET drain; connects directly to rectified AC line; withstands 700V DC blocking. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side constant-voltage regulation | Eliminates optocoupler and secondary-side feedback components, reducing BOM count and layout complexity. |
| Integrated 700V MOSFET with 20Ω RDS(on) | Enables single-chip offline regulator design without external HV switch, lowering system cost and footprint. |
| Frequency foldback + peak current compression | Reduces switching frequency and peak current at light loads, achieving <30mW no-load consumption. |
| Multi-fault protection suite | Includes auto-restart OLP (175ms timer), SCP (440mA), open-loop detection (0.5V FB), TSD (150°C), and UVLO. |
| Leading-edge blanking (350ns) | Suppresses false triggering from MOSFET turn-on spikes, ensuring stable PWM timing in noisy flyback/buck-boost layouts. |
Applications
| Smart Home Appliance Power | IoT Device Standby Supply |
|---|---|
Use Scenario: Powering microcontroller, Wi-Fi module, and sensors in refrigerators, washing machines, and air purifiers during standby and active modes. IC Role / Device Role / Timing Role: Primary-side offline regulator providing isolated or non-isolated 5V/120mA output from 85–265VAC mains. Use Value: Achieves <30mW no-load consumption to meet Energy Star Tier 2 and EU CoC v5 standby requirements. |
Use Scenario: Providing always-on 3.3V/50mA rail for BLE/Wi-Fi SoCs in smart plugs, thermostats, and lighting controllers. IC Role / Device Role / Timing Role: Green-mode CV regulator operating in DCM at light loads, with auto-restart after OLP/SCP faults. Use Value: Delivers stable output across universal AC input while minimizing heat rise in enclosed plastic enclosures. |
| White Goods Control Board | Industrial Panel PC Auxiliary Rail |
Use Scenario: Generating 5V for display drivers, touch controllers, and motor gate drivers in dishwashers and ovens. IC Role / Device Role / Timing Role: Non-isolated buck regulator with integrated 700V MOSFET, enabling direct rectified-input topology. Use Value: Reduces component count vs. traditional flyback solutions-no transformer, optocoupler, or TL431 required. |
Use Scenario: Supplying auxiliary 5V/100mA for fan control, LED indicators, and USB peripherals in DIN-rail mounted HMIs. IC Role / Device Role / Timing Role: Robust offline regulator with 150°C thermal shutdown and 2.2kV HBM ESD rating for industrial environments. Use Value: Maintains regulation under brownout (85VAC) and surge (2kV) conditions per IEC 61000-4-5 Level 3. |
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 |
|---|---|---|---|
| MP173AGJ-Z | Higher 150mA CCM output, 750V drain rating, improved EMI filtering; same TSOT23-5 package and pinout. | Better suited for 3.5W+ designs or higher-surge environments (IEC 61000-4-5 Level 4). | Select when >120mA output or enhanced surge immunity is required; drop-in compatible with minor R/C tuning. |
| LNK3206G | 650V rating, 115mA max output, different control architecture (flux-link feedback); SO-8 package only. | Lacks TSOT23-5 option; requires optocoupler for tighter CV accuracy; higher no-load power (~50mW). | Choose only if legacy LNK3xx design reuse is needed; not recommended for new compact designs targeting <30mW standby. |
Compared with MP172AGJ-Z, MP173AGJ-Z offers higher power headroom and surge tolerance in identical packaging, while LNK3206G trades integration and efficiency for legacy ecosystem compatibility and lower CV accuracy.
Availability
MP172AGJ-Z is available at Aetrix Electronics and suitable for home appliance control boards, IoT standby power supplies, and industrial auxiliary rails requiring stable component supply, RoHS-compliant sourcing, and long-term lifecycle support.
Supply support for MP172AGJ-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 power management ICs, with over 20 years of expertise in DC/DC, AC/DC, and motor driver solutions.
The MP172A product line delivers highly integrated, low-component-count offline regulators targeting cost-sensitive, space-constrained applications in white goods, consumer electronics, and industrial controls.
FAQ
What is the maximum output power achievable with MP172AGJ-Z in TSOT23-5 package?
The MP172AGJ-Z delivers up to 3W output power in continuous conduction mode (CCM) at full load, limited by thermal dissipation in the TSOT23-5 package (1W PD rating at 25°C ambient). Derating is required above 60°C ambient; actual power depends on PCB copper area, airflow, and inductor selection per Equation (7) in the datasheet.
Does MP172AGJ-Z require an external startup resistor?
No. The MP172AGJ-Z features an internal high-voltage current source connected to the DRAIN pin that self-starts the IC and charges the VCC capacitor-eliminating the need for an external startup resistor or auxiliary winding.
How does the MP172AGJ-Z achieve optocoupler-free regulation?
It uses primary-side sensing via a feedback capacitor (C3) that samples the output voltage during freewheeling phase. The FB pin compares this sampled voltage to an internal 2.55V reference, adjusting switching duty cycle to maintain constant output voltage without secondary-side components.
Can MP172AGJ-Z be used in isolated flyback topology?
Yes-though designed for non-isolated topologies, the MP172AGJ-Z supports isolated flyback by referencing FB to the secondary-side ground through an auxiliary winding or resistive divider. However, CV accuracy degrades to ±5% due to transformer leakage and diode drop; it is not recommended for precision isolated outputs.
What is the purpose of the NC pins in SOIC-8 version, and are they present in MP172AGJ-Z?
The SOIC-8 variant (MP172AGS) has three NC pins (5, 6, 8), but the TSOT23-5 MP172AGJ-Z has no NC pins-its five pins (VCC, FB, SOURCE×2, DRAIN) are all functional. Pin 3 and 4 are internally bonded to the same SOURCE node and must both be connected to system ground.
How does frequency foldback improve efficiency at light loads?
As load decreases, the MP172AGJ-Z reduces switching frequency and compresses peak current, lowering dynamic losses in the MOSFET and transformer. This extends off-time, minimizes core loss, and cuts total system power to <30mW at no-load-meeting global standby energy regulations.
Is MP172AGJ-Z compliant with lead-free and RoHS requirements?
Yes. MP172AGJ-Z is fully lead-free, halogen-free, and RoHS-compliant per EU Directive 2011/65/EU. MPS confirms green status via its Quality Assurance portal, and the TSOT23-5 package meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1.
MP172AGJ-Z 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:
- 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:
- TSOT-23-5
- Mounting Type:
- Surface Mount
MP172AGJ-Z FAQ
1.How can I place an order for MP172AGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP172AGJ-Z 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 MP172AGJ-Z reliable?
The price and inventory of MP172AGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP172AGJ-Z is usually 5 days.
3.What payment methods are accepted for MP172AGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP172AGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP172AGJ-Z?
MP172AGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP172AGJ-Z 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 MP172AGJ-Z?
For technical support, including MP172AGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP172AGJ-Z requirements.
6.How does Aetrix verify that MP172AGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP172AGJ-Z 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 MP172AGJ-Z meets industry standards.
7.What is the process for return or replacement of MP172AGJ-Z?
All MP172AGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP172AGJ-Z, 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 MP172AGJ-Z part is unused and in its original packaging.
Return procedure for MP172AGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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