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Monolithic Power Systems Inc. MP6900DJ-LF-Z
- Part No.:
- MP6900DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP6900DJ-LF-Z.pdf
- Description:
- IC SECONDARY SIDE CTRLR TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,417
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Product details
Overview
MP6900DJ-LF-Z from Monolithic Power Systems is a fast turn-off intelligent synchronous rectifier controller designed for secondary-side replacement of Schottky diodes in flyback converters. It regulates external MOSFET VDS to ~70 mV, achieves 20 ns total turn-off delay, supports CCM/DCM/QR topologies, and operates with VDD from 8 V to 24 V - enabling up to 1.5 W power savings in notebook adapters.
For engineers reviewing the MP6900DJ-LF-Z datasheet, MP6900DJ-LF-Z pinout, MP6900DJ-LF-Z application, or MP6900DJ-LF-Z equivalent, this device delivers precise low-voltage synchronous rectification control with validated thermal shutdown (170°C), UVLO (6.0 V rising), and dual-package compatibility (TSOT23-5/QFN6/SOIC-8) for high-efficiency AC/DC designs.
Technical Context
The MP6900DJ-LF-Z implements adaptive gate drive with blanking logic: 200 ns minimum on-time and dynamic turn-off threshold shifting (–70 mV → +50 mV during blanking) to prevent shoot-through. Its VD sense input tolerates up to 180 V, enabling direct connection to high-voltage MOSFET drains without external level-shifting.
It features integrated thermal shutdown (170°C activation, 50°C hysteresis), under-voltage lockout (6.0 V rising, 1.2 V hysteresis), and supports both high-side and low-side synchronous rectification configurations - confirmed across 90 W flyback reference designs at 90 VAC and 250 VAC inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 8 V to 24 V - powers internal circuitry across universal AC input-derived bias rails |
| VDS Regulation Target | 70 mV typ - actively controls external MOSFET conduction to minimize forward loss |
| Turn-off Total Delay | 20 ns max - enables ultra-fast MOSFET turn-off before reverse current builds |
| Max Switching Frequency | 400 kHz - supports high-density QR and DCM flyback designs |
| Quiescent Current | 3 mA max - reduces no-load power consumption for Energy Star 1 W standby compliance |
| Thermal Shutdown Threshold | 170°C - protects die integrity during sustained overload or poor PCB thermal design |
| UVLO Rising Threshold | 6.0 V - ensures stable startup after VDD rail settles above minimum operating voltage |
Pinout & Package
MP6900DJ-LF-Z uses the TSOT23-5 package: 2.9 mm × 1.6 mm × 0.95 mm body, 0.95 mm pitch, exposed pad optional (not electrically connected), JEDEC MO-193 compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VG | Gate drive output - delivers active pull-up/pull-down to external MOSFET gate with 2 A sink capability |
| 2 | VSS | Signal ground reference - shared return for VD sensing and internal comparator inputs |
| 3 | VDD | Supply input - powers internal bias, gate driver, and control logic; requires local 1 µF bypass |
| 4 | VD | Drain voltage sense - high-voltage input (–0.7 V to +180 V) monitoring MOSFET drain node |
| 5 | PGND | Power ground - dedicated return path for gate driver current; must be low-inductance tie to source |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VDS regulation | Maintains ~70 mV forward drop across external MOSFET regardless of load current or temperature |
| Programmable blanking logic | 200 ns minimum on-time + dynamic turn-off threshold shift prevents false triggering during switching transients |
| High-voltage VD input | Withstands –0.7 V to +180 V - eliminates need for external clamping or level-shift circuits |
| Thermal protection with hysteresis | Shuts down at 170°C; resumes operation only after junction cools to 120°C - prevents thermal cycling damage |
| Topology agnostic control | Validated in CCM, DCM, and quasi-resonant flyback - no mode-select pins or configuration required |
Applications
| USB-C PD Adapters | Industrial Flyback PSUs |
|---|---|
|
Use Scenario: 65 W USB-C PD adapter operating at 90–264 VAC input with QR flyback topology. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier controller managing MOSFET gate timing to replace 40 V Schottky diode. Use Value: Enables 1.2 W reduction in conduction loss at full load, meeting DOE Level VI and EU CoC Tier 2 efficiency requirements. |
Use Scenario: 48 V/1 A industrial auxiliary supply with wide ambient temperature range (–40°C to +85°C). IC Role / Device Role / Timing Role: Low-quiescent-current synchronous rectifier controller maintaining regulation stability across temperature extremes. Use Value: Delivers consistent 70 mV VDS regulation from –40°C to +125°C junction, reducing thermal derating needs. |
| Medical Power Modules | Smart Home AC/DC Converters |
|
Use Scenario: IEC 60601-compliant 24 V/2 A medical isolation power supply with reinforced creepage/clearance. IC Role / Device Role / Timing Role: High-side synchronous rectifier controller driving N-channel MOSFET on transformer secondary winding. Use Value: Eliminates Schottky reverse recovery losses while maintaining <3 mA quiescent current for low standby power. |
Use Scenario: 12 V/3 A smart speaker AC/DC converter requiring Energy Star 1 W standby compliance. IC Role / Device Role / Timing Role: Low-VDD start-up controller enabling reliable operation from 8 V bias derived from auxiliary winding. Use Value: Achieves 0.85 W no-load input power via UVLO hysteresis and shutdown current <250 µA at 20 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous rectifier controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NCP4306DR2G | Fixed 60 mV VDS regulation; 45 ns turn-off delay; SOIC-8 only; no TSOT23-5 option | Limited to medium-frequency DCM flyback; lacks QR support and high-voltage VD tolerance (max 100 V) | Prefer when board space allows SOIC-8 and VD stress remains <100 V |
| Vishay SiHP20N60E | Discrete MOSFET-only solution; no integrated control logic; requires external driver and sensing | Demands custom gate timing design; increases BOM count and layout complexity for synchronous rectification | Select only for legacy designs where controller integration is not feasible |
Compared with NCP4306DR2G and SiHP20N60E, MP6900DJ-LF-Z uniquely combines TSOT23-5 footprint, 180 V VD rating, and 20 ns turn-off delay - enabling compact, high-voltage, high-efficiency synchronous rectification without external components.
Availability
MP6900DJ-LF-Z is available at Aetrix Electronics and suitable for USB-C PD adapters, industrial flyback PSUs, medical power modules, and smart home AC/DC converters requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.
Supply support for MP6900DJ-LF-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 20 years of expertise in DC/DC conversion, motor drivers, and power management.
The MP6900 product line targets high-efficiency AC/DC secondary-side synchronous rectification, specifically engineered to replace Schottky diodes in flyback converters while delivering measurable power savings and thermal robustness.
FAQ
What is the function of the VD pin on MP6900DJ-LF-Z?
The VD pin senses the drain voltage of the external MOSFET and triggers turn-off when VSS–VD crosses the –30 mV threshold. It accepts –0.7 V to +180 V, enabling direct connection to high-voltage secondary windings without external resistive dividers or clamps.
Does MP6900DJ-LF-Z support high-side synchronous rectification?
Yes - MP6900DJ-LF-Z explicitly supports both high-side and low-side configurations. Its VSS reference and VD sensing architecture allow placement on either side of the transformer secondary, with gate drive referenced to the MOSFET source via PGND and VSS.
How does the 200 ns blanking time affect minimum duty cycle in CCM operation?
The 200 ns blanking time sets the absolute minimum on-time. In CCM flyback, setting synchronous period below 200 ns risks shoot-through due to insufficient time for gate drive settling - hence MP6900DJ-LF-Z recommends ≥200 ns minimum off-time between consecutive turn-on events.
What is the maximum recommended MOSFET Qg for reliable turn-on with MP6900DJ-LF-Z?
Per Figure 6 in the datasheet, MP6900DJ-LF-Z drives a 120 nC Qg MOSFET to 5 V in ≤300 ns. For robust margin, MOSFETs with Qg ≤100 nC are recommended to ensure full gate saturation within the 150 ns turn-on delay window and maintain <70 mV VDS regulation.
Is the EN pin functional on MP6900DJ-LF-Z?
No - the EN (enable) pin is only present on the SOIC-8 variant (MP6900DS). The TSOT23-5 package (MP6900DJ-LF-Z) has no enable functionality; operation is fully automatic once VDD exceeds UVLO threshold.
How is thermal performance affected by package choice?
TSOT23-5 has θJA = 220°C/W, limiting continuous dissipation to 0.57 W at 25°C ambient. For >100 mW dissipation - common above 100 kHz switching or with CLOAD >5 nF - the thermally enhanced SOIC-8 (θJA = 90°C/W, 1.39 W rating) is recommended per datasheet guidance.
MP6900DJ-LF-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
- Programmable:
- Not Verified
- Applications:
- Secondary-Side Controller
- Voltage - Input:
- -
- Voltage - Supply:
- 8V ~ 24V
- Current - Supply:
- 3 mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MP6900DJ-LF-Z FAQ
1.How can I place an order for MP6900DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP6900DJ-LF-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 MP6900DJ-LF-Z reliable?
The price and inventory of MP6900DJ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP6900DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP6900DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP6900DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP6900DJ-LF-Z?
MP6900DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP6900DJ-LF-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 MP6900DJ-LF-Z?
For technical support, including MP6900DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP6900DJ-LF-Z requirements.
6.How does Aetrix verify that MP6900DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP6900DJ-LF-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 MP6900DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP6900DJ-LF-Z?
All MP6900DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP6900DJ-LF-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 MP6900DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP6900DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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