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Monolithic Power Systems Inc. MP173GJ-Z
- Part No.:
- MP173GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- AC DC Converters, Offline Switches
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP173GJ-Z.pdf
- Description:
- IC OFFLIN CONV MULT TOP TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:879
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Product details
Overview
MP173GJ-Z from Monolithic Power Systems is a 700 V non-isolated offline primary-side constant-voltage regulator with integrated MOSFET, supporting buck/boost/buck-boost/flyback topologies. It delivers up to 280 mA output current in CCM, achieves <30 mW no-load power consumption, and operates across -40°C to +125°C junction temperature for home appliance standby power supplies.
For engineers reviewing the MP173GJ-Z datasheet, MP173GJ-Z pinout, MP173GJ-Z application, or MP173GJ-Z equivalent, this device serves as a cost-optimized, green-mode CV controller requiring minimal external components - especially relevant when evaluating primary-side regulation alternatives for low-power AC/DC conversion without optocouplers.
Technical Context
The MP173GJ-Z implements primary-side CV regulation using internal sampling of a feedback capacitor (C3) to reconstruct output voltage without secondary-side sensing. Its control loop integrates an error amplifier with 2.55 V reference, ramp compensation, and leading-edge blanking (350 ns) to suppress turn-on spikes.
It employs frequency foldback and peak-current compression to reduce switching frequency and limit peak current under light load, enabling <30 mW no-load consumption. Protection logic includes auto-restart OLP (220 ms delay), SCP (600 mA threshold), TSD (150°C trip), and open-loop detection (<0.5 V FB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 700 V drain-source rating enables direct universal AC input rectification without pre-regulator. |
| Output Current | Up to 280 mA in CCM mode - defines maximum continuous load capability for 4 W-class offline supplies. |
| No-Load Power | <30 mW - meets stringent standby energy standards (e.g., DOE Level VI, EU CoC Tier 2) without auxiliary winding. |
| FB Reference Voltage | 2.55 V ±0.1 V - sets output voltage accuracy via R1/R2 divider; used directly in Equation Vo = 2.55 × (1 + R1/R2). |
| Thermal Shutdown | 150°C trip with 30°C hysteresis - ensures safe operation during sustained overload or poor heatsinking. |
| Peak Current Limit | 420 mA typical - determines on-time duration and maximum power delivery in CCM operation. |
| VCC Operating Range | 5.1–5.8 V (ON/OFF hysteresis 130–250 mV) - defines self-bias window for internal regulator startup and shutdown sequencing. |
Pinout & Package
MP173GJ-Z is housed in a TSOT23-5 package with exposed drain pad for thermal enhancement. Pin 1 is VCC, Pin 2 is FB, Pins 3 and 4 are SOURCE (internally tied), and Pin 5 is DRAIN. NC pins are absent in this 5-pin variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Internal control circuit supply; charged by high-voltage regulator from DRAIN; triggers startup at 5.4–5.7 V. |
| 2 | FB | Primary-side feedback input; monitors sampled output voltage via external capacitor; compares to 2.55 V reference. |
| 3,4 | SOURCE | Power MOSFET source terminal and ground reference for VCC/FB; must be connected to system power ground. |
| 5 | DRAIN | 700 V MOSFET drain and HV current source input; connects to rectified AC line or boost inductor node. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side CV regulation | Eliminates optocoupler and TL431, reducing BOM count and layout complexity in non-isolated topologies. |
| Integrated 700 V MOSFET | Enables direct connection to rectified AC line; removes need for external HV switch and gate driver. |
| Green-mode operation | Simultaneous reduction of switching frequency and peak current at light load improves average efficiency and meets eco-standby requirements. |
| Comprehensive protection suite | TSD, UVLO, OLP (220 ms timer), SCP (600 mA), and open-loop detection provide robust fault recovery without external supervision. |
| Self-supplied VCC architecture | High-voltage regulator draws current from DRAIN to charge VCC capacitor - eliminates auxiliary winding or bias supply. |
Applications
| Home Appliance Standby Supply | White Goods Control Logic Power |
|---|---|
|
Use Scenario: Providing 5–12 V standby power to microcontrollers and sensors in washing machines, refrigerators, and dishwashers during off-cycle. IC Role / Device Role / Timing Role: Primary-side CV regulator operating in flyback or buck topology to generate isolated or non-isolated low-power rail directly from rectified AC. Use Value: <30 mW no-load consumption satisfies IEC 62301 Ed.2 standby power limits while eliminating optocoupler cost and calibration drift. |
Use Scenario: Powering PLC I/O modules and display controllers in HVAC systems and smart ovens where space and component count are constrained. IC Role / Device Role / Timing Role: Non-isolated buck regulator delivering stable 3.3 V or 5 V from rectified line voltage with minimal external parts. Use Value: Integrated 700 V MOSFET and self-biased VCC reduce bill-of-materials by ≥4 components versus discrete HV controller + MOSFET solutions. |
| Consumer Electronics Auxiliary Rail | Industrial Sensor Interface Power |
|
Use Scenario: Generating auxiliary 5 V rail for remote controls, IR receivers, and touch panels in TVs and audio systems during standby mode. IC Role / Device Role / Timing Role: Boost topology regulator converting rectified low-line voltage to regulated output with frequency foldback for ultra-low idle loss. Use Value: Peak-current compression and soft-start prevent inrush overshoot during wake-up events while maintaining tight CV regulation. |
Use Scenario: Supplying 12 V bias to analog front-ends and signal conditioners in factory automation sensors operating from 24 VAC or 120 VAC mains. IC Role / Device Role / Timing Role: Buck-boost regulator handling wide input variation (e.g., 12–100 VDC) to maintain stable output despite fluctuating field bus voltage. Use Value: 125°C max operating junction temperature and robust OLP/SCP ensure reliable operation in unventilated enclosures with ambient up to 85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary-side constant-voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP173A-GJ-Z | Successor with improved EMI performance, tighter FB reference (±1%), and enhanced surge immunity per IEC 61000-4-5. | Required for new designs; supports same topologies but mandates updated transformer design due to modified timing parameters. | Select MP173A-GJ-Z for all new projects - MP173GJ-Z is explicitly marked "NOT RECOMMENDED FOR NEW DESIGNS". |
| LNK304DG-TL | 725 V rated, integrated 700 V switch, but uses secondary-side feedback via optocoupler and lacks frequency foldback. | Better suited for isolated flyback with tighter cross-regulation; higher no-load consumption (~100 mW) limits eco-mode compliance. | Choose only if isolation is mandatory and optocoupler-based feedback is acceptable; not drop-in compatible. |
Compared with MP173GJ-Z, MP173A-GJ-Z offers verified improvements in EMI and reference stability for next-generation designs, while LNK304DG-TL provides isolation at the cost of higher no-load loss and added component count - making MP173GJ-Z optimal only for legacy non-isolated, cost-sensitive applications.
Availability
MP173GJ-Z is available at Aetrix Electronics and suitable for home appliance standby supplies, white goods control logic, and consumer electronics auxiliary rails requiring stable component supply through extended product lifecycles.
Supply support for MP173GJ-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 analog and power ICs, with over two decades of leadership in DC/DC conversion and AC/DC regulation.
The MP173 product line targets cost-sensitive, low-power offline applications requiring primary-side regulation - designed specifically to replace discrete HV controller + MOSFET combinations in home and industrial standby power.
FAQ
What topologies does MP173GJ-Z support?
MP173GJ-Z supports buck, boost, buck-boost, and flyback configurations. It operates in non-isolated modes (buck, boost, buck-boost) using direct feedback, and in isolated flyback using indirect feedback via auxiliary winding sampling. The datasheet provides schematic examples and component selection guidelines for each.
Why is MP173GJ-Z labeled "NOT RECOMMENDED FOR NEW DESIGNS"?
This designation appears in the official MPS datasheet Rev. 1.01 because MP173A-GJ-Z supersedes it with improved EMI behavior, tighter FB reference tolerance (±1% vs ±4%), and enhanced surge immunity. MP173GJ-Z remains fully functional but is reserved for legacy design refreshes or cost-constrained replacements.
How does MP173GJ-Z achieve <30 mW no-load power consumption?
It combines green-mode operation (frequency foldback + peak-current compression), low VCC operating current (200 µA in no-switching state), and internally biased VCC supply - eliminating external bias windings or regulators. The 350 ns leading-edge blanking also reduces unnecessary switching losses during light load.
What is the role of the feedback capacitor (C3) in MP173GJ-Z circuits?
C3 performs sample-and-hold of the output voltage during freewheeling phase. Its value (typically 1–10 nF) directly impacts light-load regulation: too small causes poor CV accuracy; too large slows transient response. Equation (11) in the datasheet provides sizing guidance based on output current and resistor values.
Can MP173GJ-Z be used in isolated flyback designs?
Yes - the datasheet includes a flyback schematic (page 12) using an auxiliary winding to derive VCC and feed back sampled output voltage. However, regulation accuracy is lower than in non-isolated topologies due to transformer coupling variations and leakage inductance effects.
What thermal considerations apply to MP173GJ-Z in TSOT23-5 package?
TSOT23-5 has θJA = 100°C/W. At 1 W dissipation (max rated), junction-to-ambient rise is 100°C - requiring careful PCB copper area under the exposed drain pad and ambient ≤25°C for reliable 125°C operation. Derating is essential above 60°C ambient.
Does MP173GJ-Z require a dummy load?
Yes - a 2–5 mA resistive dummy load is recommended to ensure sufficient inductor energy for C3 sampling during light/no-load conditions. This maintains regulation accuracy but slightly increases no-load power; zener-based dummy loads can reduce consumption if regulation is relaxed.
MP173GJ-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:
- 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):
- 4 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
MP173GJ-Z FAQ
1.How can I place an order for MP173GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP173GJ-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 MP173GJ-Z reliable?
The price and inventory of MP173GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP173GJ-Z is usually 5 days.
3.What payment methods are accepted for MP173GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP173GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP173GJ-Z?
MP173GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP173GJ-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 MP173GJ-Z?
For technical support, including MP173GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP173GJ-Z requirements.
6.How does Aetrix verify that MP173GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP173GJ-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 MP173GJ-Z meets industry standards.
7.What is the process for return or replacement of MP173GJ-Z?
All MP173GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP173GJ-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 MP173GJ-Z part is unused and in its original packaging.
Return procedure for MP173GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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