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Monolithic Power Systems Inc. MP173AGJ-Z
- Part No.:
- MP173AGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- AC DC Converters, Offline Switches
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP173AGJ-Z.pdf
- Description:
- IC OFFLIN CONV MULT TOP TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,020
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Product details
Overview
MP173AGJ-Z from Monolithic Power Systems is a 700V primary-side constant-voltage offline regulator with integrated MOSFET, supporting buck/boost/buck-boost/flyback topologies in non-isolated AC/DC power supplies. It delivers up to 280mA output current in CCM, achieves <30mW no-load consumption, and features green-mode frequency foldback and peak current compression for high light-load efficiency. It targets standby and low-power home appliance power stages.
For engineers reviewing the MP173AGJ-Z datasheet, MP173AGJ-Z pinout, MP173AGJ-Z application, or MP173AGJ-Z equivalent, this page provides verified technical context, TSOT23-5 package mapping, CV regulation behavior, protection thresholds (TSD @ 150°C, SCP @ 600mA typ), and topology-specific design constraints - all confirmed from Monolithic Power's Rev. 1.0 datasheet.
Technical Context
The MP173AGJ-Z implements primary-side CV regulation via internal error amplifier sampling FB 6μs after MOSFET turn-off, using a 2.55V reference and exponential ramp compensation that scales with load. Its green-mode operation dynamically reduces both switching frequency and peak current limit under decreasing load - enabling <30mW no-load power while maintaining stable 12V/250mA output in typical buck applications.
Protection logic integrates auto-restart thermal shutdown (150°C trip, 30°C hysteresis), open-loop detection (VFB < 0.5V), OLP (220ms timer at 28kHz), and SCP (600mA threshold with 180ns blanking). The integrated 700V/18Ω MOSFET operates with leading-edge blanking (350ns) and internally biased VCC, eliminating external bias windings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 700V drain-source rating enables direct universal AC input (85–265VAC) rectified connection without external HV FET. |
| Output Current Capability | Up to 280mA in continuous conduction mode (CCM); limited to 180mA in discontinuous mode (DCM) - defines max power envelope (≤4W). |
| No-Load Power | <30mW - achieved via frequency foldback and peak current compression, critical for Energy Star Level VI standby compliance. |
| Feedback Reference | 2.55V ±0.1V - sets output voltage via R1/R2 divider; used with sampling capacitor (C3) for primary-side sensing without optocoupler. |
| Thermal Shutdown | 150°C trip with 30°C hysteresis - protects die during overload or poor PCB thermal layout; recovery occurs at ~120°C. |
| Short-Circuit Threshold | 600mA typical - triggers immediate shutdown with 180ns blanking to reject diode reverse-recovery spikes. |
| VCC Operating Range | 5.1–5.8V (ON/OFF hysteresis = 250mV) - powers control circuitry; internal HV regulator self-supplies from DRAIN pin. |
Pinout & Package
MP173AGJ-Z is housed in a TSOT23-5 package (JEDEC MO-193, variation AA), featuring exposed drain pad for thermal enhancement and compact footprint (2.8 × 2.9 × 1.0mm). Pin 1 is marked by dot; pin 3 and 4 are internally shorted SOURCE terminals.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Internal regulator supply input; charges external capacitor during startup; UVLO activates below 5.1V. |
| 2 | FB | Primary-side feedback node; samples output via RC network; triggers switching when voltage drops below 2.55V. |
| 3, 4 | SOURCE | Integrated MOSFET source terminal and ground reference for VCC/FB; must connect to power ground plane. |
| 5 | DRAIN | High-voltage MOSFET drain; connects to rectified AC input; carries full primary current and 700V stress. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side CV regulation | Eliminates optocoupler and secondary-side TL431, reducing BOM count and cost in non-isolated SMPS designs. |
| Green-mode frequency foldback | Switching frequency decreases with load - maintains >75% efficiency at 10% load, critical for standby power budgets. |
| Integrated 700V MOSFET | RON = 18Ω @ 25°C - enables single-chip offline regulator solution without external HV switch or driver. |
| Multi-protection suite | TSD, UVLO, OLP (220ms timer), SCP (600mA), and open-loop detection - ensures robust operation across line/load transients. |
| Low-VCC quiescent current | 200µA (no-switching) and 720µA (active) - minimizes VCC capacitor size and supports small-value hold-up capacitors. |
Applications
| Smart Appliance Standby Supply | White Goods Auxiliary Power |
|---|---|
|
Use Scenario: Providing 5V/12V auxiliary rail for microcontroller, display, and sensor interface in washing machines and refrigerators during standby mode. IC Role / Device Role / Timing Role: Primary-side offline regulator operating in flyback or buck topology; replaces transformer-based linear regulators to meet IEC 62301 <0.5W requirements. Use Value: Achieves <30mW no-load consumption and automatic frequency scaling - directly enabling compliance with EU Ecodesign Lot 6 and ENERGY STAR® criteria. |
Use Scenario: Generating isolated 12V/250mA output for motor control logic and communication modules in HVAC fan units and dishwashers. IC Role / Device Role / Timing Role: Flyback controller with primary-side regulation; uses internal 700V MOSFET and FB sampling to eliminate optocoupler feedback path. Use Value: Reduces component count by 4–6 parts (optocoupler, TL431, bias winding, Zener) while maintaining ±5% output regulation across 0–100% load range. |
| Industrial Sensor Node Power | Consumer Electronics Low-Power Adapter |
|
Use Scenario: Powering 3.3V/100mA IoT sensor nodes in factory automation systems where space and thermal constraints prohibit transformers. IC Role / Device Role / Timing Role: Non-isolated buck regulator driving inductor-based DC/DC stage; leverages minimum off-time control and ramp compensation for stable light-load regulation. Use Value: Enables compact, low-profile PCB layout (<1.0mm height) with 92% peak efficiency and <15mVpp output ripple at full load - suitable for vibration-sensitive environments. |
Use Scenario: Building compact wall-plug adapters for Bluetooth speakers and smart lighting with universal AC input and no-load power <30mW. IC Role / Device Role / Timing Role: Constant-voltage offline regulator in boost configuration; uses frequency foldback and peak current compression to maintain efficiency down to 1% load. Use Value: Meets DOE Level VI and CoC Tier 2 no-load requirements without auxiliary winding or external bias circuitry - simplifying certification testing. |
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 |
|---|---|---|---|
| MP174AGS-Z | SOIC-8 package; higher 1W θJA (96°C/W vs. TSOT23-5's 100°C/W); identical electrical specs and pinout except N/C pins. | Better thermal margin for >2W continuous operation; requires larger PCB area; not drop-in compatible with TSOT23-5 footprints. | Select when thermal derating above 1.2W is required or when board layout accommodates SOIC-8 and needs extra N/C routing flexibility. |
| LNK3206G | 725V breakdown; lower 220mA CCM current; no frequency foldback - fixed 66kHz operation; requires external bias winding. | Lacks green-mode efficiency optimization; higher no-load power (~150mW); less suitable for sub-50mW standby targets. | Choose only if legacy LNK3xxx design reuse is mandatory; avoid when <30mW no-load or high light-load efficiency is specified. |
Compared with MP173AGJ-Z, MP174AGS-Z offers identical regulation performance in a thermally superior SOIC-8 package but requires footprint redesign, while LNK3206G lacks frequency foldback and delivers significantly higher no-load consumption - making MP173AGJ-Z the optimal choice for space-constrained, ultra-low-standby applications.
Availability
MP173AGJ-Z is available at Aetrix Electronics and suitable for home appliance standby supplies, white goods auxiliary rails, and industrial sensor node power converters requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for MP173AGJ-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 two decades of expertise in DC/DC, AC/DC, LED drivers, and motor drivers.
The MP173A product line delivers primary-side regulated offline controllers targeting cost-sensitive, space-constrained non-isolated AC/DC applications - designed specifically for energy-efficient standby and auxiliary power in consumer and industrial equipment.
FAQ
What topology does MP173AGJ-Z support without external components?
The MP173AGJ-Z natively supports buck, boost, buck-boost, and flyback topologies using only passive external components (inductor, diode, capacitors, resistors). Its integrated 700V MOSFET and primary-side feedback eliminate need for optocouplers, bias windings, or external gate drivers - enabling complete non-isolated converter implementation in as few as six components.
How does MP173AGJ-Z achieve <30mW no-load power?
MP173AGJ-Z achieves <30mW no-load consumption through coordinated green-mode operation: frequency foldback reduces switching losses, peak current compression lowers conduction losses, and internal VCC regulation minimizes quiescent current to 200µA. These features are active below 10% load and validated per IEC 62301 test conditions at 230VAC input.
Can MP173AGJ-Z replace optocoupler-based feedback in existing designs?
Yes - MP173AGJ-Z replaces optocoupler-based feedback by implementing primary-side constant-voltage regulation via FB pin sampling of a resistor-capacitor network tied to the output. Output voltage is set by R1/R2 divider (VOUT = 2.55V × (R1/R2 + 1)), with C3 providing sample-and-hold function; no secondary-side components are required.
What is the maximum safe operating temperature for continuous use?
The MP173AGJ-Z has a maximum junction temperature of 150°C, with thermal shutdown activating at that threshold and recovering at ~120°C. For continuous operation, ambient temperature must be limited such that power dissipation (PD = (TJ − TA)/θJA) stays within 1W for TSOT23-5 (θJA = 100°C/W). At 25°C ambient, max continuous power is 1.25W before thermal limiting begins.
Does MP173AGJ-Z require an external VCC capacitor?
Yes - a 1–4.7µF ceramic capacitor is required between VCC and SOURCE pins to stabilize internal regulation. The datasheet recommends low-ESR types; insufficient capacitance causes erratic startup or UVLO cycling. Under fault conditions (OLP/SCP), VCC discharges to 2.5V (VCCPRO) before restart - confirming capacitor must sustain >2.5V during recovery.
How is short-circuit protection implemented without secondary sensing?
MP173AGJ-Z implements primary-side SCP by monitoring peak current at the DRAIN pin using internal current sense. When sensed current exceeds 600mA (typical), the device shuts down within one switching cycle. Leading-edge blanking (180ns) prevents false triggering from diode reverse-recovery spikes - validated in typical 12V/250mA flyback waveforms.
What is the role of the FB capacitor (C3) in regulation stability?
The FB capacitor (C3) performs sample-and-hold of output voltage during freewheeling phase, enabling primary-side regulation without isolation. Its value (typically 1–10nF) directly affects light-load regulation: too small causes output droop; too large slows transient response. Optimal value follows CFB ≥ VO × CO / (IOUT × (R1 + R2)) per datasheet Equation (11).
MP173AGJ-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):
- 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
MP173AGJ-Z FAQ
1.How can I place an order for MP173AGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP173AGJ-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 MP173AGJ-Z reliable?
The price and inventory of MP173AGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP173AGJ-Z is usually 5 days.
3.What payment methods are accepted for MP173AGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP173AGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP173AGJ-Z?
MP173AGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP173AGJ-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 MP173AGJ-Z?
For technical support, including MP173AGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP173AGJ-Z requirements.
6.How does Aetrix verify that MP173AGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP173AGJ-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 MP173AGJ-Z meets industry standards.
7.What is the process for return or replacement of MP173AGJ-Z?
All MP173AGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP173AGJ-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 MP173AGJ-Z part is unused and in its original packaging.
Return procedure for MP173AGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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