My Inquiry
My Account
Monolithic Power Systems Inc. MP6905GS-Z
- Part No.:
- MP6905GS-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP6905GS-Z.pdf
- Description:
- FAST TURN-OFF, INTELLIGENT RECTI
- Quantity:
- Payment:
- Shipping:
Inventory:1,167
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP6905GS-Z from Monolithic Power Systems is a fast-turn-off intelligent rectifier controller IC designed for synchronous rectification in flyback converters. It replaces Schottky diodes by driving an external MOSFET with regulated forward voltage (~30 mV), supports CCM/DCM/QR topologies, operates from 8–24 V VDD, and features 20 ns total turn-off delay and <300 µA light-load quiescent current - enabling up to 1.5 W power savings in notebook adapters.
For engineers reviewing the MP6905GS-Z datasheet, MP6905GS-Z pinout, MP6905GS-Z application, or MP6905GS-Z equivalent, key selection considerations include its dual-mode (heavy/light-load) gate control, VD-sense-based zero-current detection, SOIC-8 package compatibility, and explicit design constraints on external MOSFET RDS(ON) selection per output current.
Technical Context
The MP6905 implements adaptive gate drive with blanking-controlled turn-on (1.6 µs minimum on time) and fast turn-off (20 ns propagation + 15 ns total delay), using VD–VSS sensing to detect MOSFET conduction polarity and regulate VDS to ~−30 mV during conduction. Its internal pull-down impedance (1–2 Ω) ensures rapid gate discharge.
It integrates light-load latch-off via external resistor on LL pin (30–300 kΩ range), triggering after TLL-Delay (70–130 µs) when conduction time falls below TLL (1.2–2.6 µs), reducing Iq to <300 µA. Thermal shutdown activates at 150°C with 30°C hysteresis, and VDD UVLO (6.0 V rising, 1.0 V hysteresis) enables automatic sleep entry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 8 V to 24 V - powers internal circuitry and gate driver; requires auxiliary winding or LDO if secondary output voltage falls outside this range. |
| Forward Voltage Regulation | ~30 mV (typ.) - sets MOSFET VDS during conduction, minimizing conduction loss independent of RDS(ON). |
| Total Turn-off Delay | 20 ns - enables high-frequency QR flyback operation with minimal reverse conduction loss. |
| Light-load Quiescent Current | <300 µA - reduces standby power to meet Energy Star 1 W requirement. |
| VD Sense Range | –0.7 V to +180 V - supports high-side and low-side rectification with robust drain-voltage monitoring. |
| Gate Drive Output (High) | 13–16.5 V - sufficient to fully enhance logic-level and standard 12 V MOSFETs. |
| Enable Threshold | 1.1–1.9 V (rising) - allows direct interface with microcontroller GPIO or optocoupler outputs. |
Pinout & Package
MP6905GS-Z is housed in a standard SOIC-8 package (JEDEC MS-012, variation AA), with exposed thermal pad not connected internally. Pin 7 is NC (no connection); all other pins are electrically functional and require proper PCB layout per sensing loop isolation guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | Return path for gate driver current; must be low-inductance connection to MOSFET source to avoid sensing error. |
| 2 EN | Enable Input | Active-high digital control; pulls VG low when low, entering shutdown mode (<100 µA current). |
| 3 LL | Light-load Timing | Connects external resistor (30–300 kΩ) to set light-load entry timing and hysteresis. |
| 4 VD | Drain Voltage Sense | High-voltage input (up to +180 V) sensing MOSFET drain; requires short, low-noise trace to MOSFET drain. |
| 5 VSS | Signal Ground / Reference | Reference node for VD sensing and internal comparator thresholds; must tie directly to MOSFET source. |
| 6 VDD | Supply Voltage | Input for internal regulator and gate driver; requires ≥1 µF ceramic decoupling capacitor near pin. |
| 7 NC | No Connection | Not bonded; must remain unconnected and un-routed on PCB. |
| 8 VG | Gate Drive Output | Push-pull output driving external MOSFET gate; capable of 2 A sink current and fast edge rates. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VDS Regulation | Maintains ~−30 mV VDS during conduction across load range, decoupling conduction loss from MOSFET RDS(ON). |
| Programmable Light-load Mode | External resistor on LL pin sets precise entry/exit timing (TLL, TLL-Delay) to minimize idle power without oscillation. |
| Fast Turn-off with Blanking | 20 ns turn-off propagation + 15 ns total delay, plus 200 ns blanking window to reject switching noise-induced false triggers. |
| High-Voltage Drain Sensing | VD input rated to +180 V with integrated protection, enabling direct connection to high-side MOSFET drain in QR flyback. |
| Multi-topology Support | Validated for CCM, DCM, and quasi-resonant flyback - accommodates variable frequency and boundary conduction modes. |
Applications
| USB-C Notebook Adapters | Industrial Flyback PSUs |
|---|---|
|
Use Scenario: 65 W USB-C PD adapter operating in QR mode with 90–264 VAC input and 20 V output. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier controller regulating MOSFET VDS to ~−30 mV and turning off within 20 ns of negative VDS crossing. Use Value: Enables >94% efficiency at full load and <300 µA no-load input power, meeting DOE Level VI and Energy Star requirements. |
Use Scenario: 48 V industrial power supply for PLC I/O modules, operating in DCM with wide ambient temperature range (−40°C to +85°C). IC Role / Device Role / Timing Role: High-reliability synchronous rectifier driver with thermal shutdown (150°C) and VDD UVLO (6.0 V) ensuring safe operation under brownout or overtemperature conditions. Use Value: Eliminates Schottky heat sink, reduces secondary-side footprint by 30%, and maintains stable regulation across line/load transients. |
| Medical AC/DC Adapters | Distributed Telecom Power |
|
Use Scenario: 30 W medical-grade AC/DC adapter certified to IEC 60601-1, requiring low leakage and high efficiency at light loads. IC Role / Device Role / Timing Role: Intelligent rectifier with programmable light-load latch-off (via LL resistor) and <300 µA quiescent current to minimize standby dissipation. Use Value: Reduces no-load power to <0.3 W while maintaining fast transient response and EMI-compliant soft turn-on behavior. |
Use Scenario: 12 V/5 A distributed DC/DC module in telecom shelf, powered from −48 V bus with flyback isolation stage. IC Role / Device Role / Timing Role: High-side synchronous rectifier controller supporting 180 V VD sense and 12 V logic-level MOSFET drive for optimal conduction efficiency. Use Value: Achieves 1.2 W lower secondary-side loss vs. Schottky solution, improving thermal margin and system MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar intelligent synchronous rectifier controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6906GS-Z | Successor device with improved ESD rating (±8 kV HBM), tighter Vfwd tolerance (±10%), and enhanced light-load stability; pin-compatible but not drop-in due to revised startup timing. | Recommended for new designs targeting long-term supply continuity and higher reliability in harsh environments. | Select MP6906GS-Z for new designs; MP6905GS-Z remains viable for legacy production or cost-sensitive replacements where MP6906 is unavailable. |
| SRK1001TR | Standalone SR controller with integrated VDS clamp (−100 V), fixed 40 mV regulation, no LL programming - lacks light-load optimization and multi-topology flexibility. | Suitable for basic CCM flyback where ultra-low standby power is not required and layout simplicity is prioritized. | Choose SRK1001TR only for cost-driven, low-complexity designs lacking light-load or QR requirements. |
Compared with MP6906GS-Z, MP6905GS-Z offers proven field reliability but lacks updated ESD robustness and tighter regulation; versus SRK1001TR, it delivers superior light-load efficiency and topology adaptability at the cost of added external component count.
Availability
MP6905GS-Z is available at Aetrix Electronics and suitable for USB-C notebook adapters, industrial flyback PSUs, and medical AC/DC adapters requiring stable component supply, RoHS compliance, and long-lifecycle support.
Supply support for MP6905GS-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP6905 belongs to MPS's intelligent synchronous rectifier controller product line, engineered specifically to replace Schottky diodes in isolated flyback converters while delivering measurable efficiency gains, thermal relief, and regulatory compliance in compact form factors.
FAQ
What is the maximum allowable VD voltage for MP6905GS-Z?
The absolute maximum VD to VSS rating is +180 V, verified per datasheet ABSOLUTE MAXIMUM RATINGS. This enables direct connection to high-side MOSFET drains in QR flyback topologies with peak reflected voltages up to 180 V. Exceeding this voltage risks permanent damage to the internal JFET input stage.
Can MP6905GS-Z drive both high-side and low-side synchronous rectifiers?
Yes - MP6905GS-Z supports both configurations. For high-side use, VSS connects to the transformer secondary ground and VD to the MOSFET drain; for low-side, VSS ties to MOSFET source and VD to drain. Layout must isolate the VD/VSS sensing loop from power paths in either case.
How does the LL pin resistor value affect light-load behavior?
The resistor (RLL) between LL and VSS sets both light-load entry delay (TLL-Delay = 70–130 µs) and pulse width threshold (TLL = 1.2–2.6 µs). A 100 kΩ resistor yields nominal values; decreasing RLL shortens both times, increasing sensitivity to light-load transitions.
What is the recommended MOSFET RDS(ON) for a 5 A output application?
Per datasheet guidance, RDS(ON) should be no lower than ~3 mΩ for 5 A output. This ensures VDS remains above −50 mV during conduction, preventing premature gate turn-off. Lower RDS(ON) increases gate drive losses and reduces effective regulation accuracy.
Does MP6905GS-Z require an external bootstrap capacitor?
No - MP6905GS-Z does not use bootstrap gate drive. It employs a direct push-pull VG output referenced to PGND/VSS. For high-side configuration, the IC must be powered from an auxiliary winding or LDO, not bootstrap, since no floating supply rail is generated internally.
Is MP6905GS-Z still recommended for new designs?
No - the datasheet explicitly states "NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP6906". MP6905GS-Z remains supported for existing production and legacy replacement, but MP6906GS-Z is the designated upgrade with enhanced specifications and long-term roadmap alignment.
What is the thermal shutdown behavior of MP6905GS-Z?
Thermal shutdown activates at 150°C junction temperature (guaranteed by characterization), pulling VG low to halt synchronous rectification. Recovery occurs at 120°C (30°C hysteresis), restoring normal operation once temperature falls below threshold - no manual reset is required.
MP6905GS-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Applications:
- Distributed, Industrial Power Systems
- Voltage - Input:
- -
- Voltage - Supply:
- 8V ~ 24V
- Current - Supply:
- 8 mA
- Operating Temperature:
- 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP6905GS-Z FAQ
1.How can I place an order for MP6905GS-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP6905GS-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 MP6905GS-Z reliable?
The price and inventory of MP6905GS-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP6905GS-Z is usually 5 days.
3.What payment methods are accepted for MP6905GS-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP6905GS-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP6905GS-Z?
MP6905GS-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP6905GS-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 MP6905GS-Z?
For technical support, including MP6905GS-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP6905GS-Z requirements.
6.How does Aetrix verify that MP6905GS-Z is sourced from the original manufacturer or authorized distributors?
All MP6905GS-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 MP6905GS-Z meets industry standards.
7.What is the process for return or replacement of MP6905GS-Z?
All MP6905GS-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP6905GS-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 MP6905GS-Z part is unused and in its original packaging.
Return procedure for MP6905GS-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP6905GS-Z Tags
-
UC3845AD8TR
Texas Instruments
-
UC2843AD8TR
Texas Instruments
-
LM3880MFX-1AE/NOPB
Texas Instruments
-
LM3880MFX-1AA/NOPB
Texas Instruments
-
INA234AIYBJR
Texas Instruments
-
INA700AYWFR
Texas Instruments
-
LM3880MF-1AE/NOPB
Texas Instruments
-
LM3880MF-1AA/NOPB
Texas Instruments
-
LM3881MM/NOPB
Texas Instruments
-
UCC2802DTR
Texas Instruments
-
NCP4305DMTTWG
onsemi
-
INA237AIDGSR
Texas Instruments
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
