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Monolithic Power Systems Inc. MP4068GS-Z
- Part No.:
- MP4068GS-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Datasheet:
-
MP4068GS-Z.pdf
- Description:
- IC LED DRV OFFL TRIAC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,568
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Product details
Overview
MP4068GS-Z from Monolithic Power Systems is a non-isolated, TRIAC-dimmable LED driver IC optimized for 120VAC input and up to 10W LED loads. It integrates a 500V MOSFET, achieves >0.7 power factor, delivers ±5% LED current accuracy via internal averaging feedback, and supports buck/buck-boost topologies in residential A19/GU10 lamps.
For engineers reviewing the MP4068GS-Z datasheet, MP4068GS-Z pinout, MP4068GS-Z application, or MP4068GS-Z equivalent, this page provides verified technical context on hybrid CCM/DCM dimming mode, thermal foldback behavior, OVP programmability, VCC UVLO thresholds (4.10–4.75V), and SOIC8-7A package constraints for compact lighting designs.
Technical Context
The MP4068GS-Z implements MPS' proprietary hybrid operation mode that dynamically switches between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) across the AC half-cycle to maintain TRIAC latching/holding current and sustain smooth dimming down to low duty cycles. Its internal high-voltage regulator draws directly from HV pin to enable fast start-up without external bias winding.
Constant-current regulation relies on an internal sample-and-hold circuit comparing sensed VFB to a 0.195V reference, with peak current limiting set at 0.46V on CS pin. Thermal protection initiates de-rating at 145°C junction temperature and triggers full shutdown at 160°C with 50°C hysteresis, ensuring flicker-free operation under high ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 108–132VAC - Validated for North American line voltage with surge tolerance up to 500V without MOV/TVS. |
| Max Output Power | 10W - Supports up to 160mA LED current at 50V output in buck configuration per design example. |
| Power Factor | >0.7 - Achieved via hybrid CCM/DCM operation to reduce harmonic distortion on AC line. |
| LED Current Accuracy | ±5% - Enabled by internal 0.195V reference and averaging feedback loop, independent of line/temperature variation. |
| Integrated MOSFET | 500V/12Ω - Eliminates need for external high-voltage switch; RDS(on) specified at 12Ω max ensures low conduction loss at 10W. |
| Thermal Shutdown Threshold | 160°C - Triggers latch-off with auto-restart at 110°C, preventing permanent damage during sustained overtemperature. |
| VCC UVLO Hysteresis | 0.24V - Ensures stable power cycling between 4.10V (turn-on) and 4.65V (turn-off), avoiding oscillation near threshold. |
Pinout & Package
MP4068GS-Z is housed in an SOIC8-7A package (JEDEC MS-012 compliant) with exposed pad omitted - thermal dissipation relies on PCB copper area connected to GND pins (pins 2,5,6). Pin 1 is marked with notch or dot; pin 7 is NC and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Internal regulator supply input | Accepts 4.1–5V; powers all control logic; requires local 2.2μF capacitor to stabilize startup and UVLO transitions. |
| GND (Pins 2,5,6) | Reference ground and thermal path | Virtual ground for CS/OVF sensing; multiple pins improve noise immunity and heat spreading across PCB. |
| OVF (Pin 3) | Over-voltage feedback input | Detects output overvoltage via resistor divider; triggers hiccup-mode shutdown when >2.0V (typical) is sensed after 32μs blanking. |
| CS (Pin 4) | Current sense input | Monitors MOSFET source current via external sense resistor; turns off switch when voltage exceeds 0.46V (max). |
| HV (Pin 8) | High-voltage drain input | Connects to AC rectified input; supplies internal 500V MOSFET and HV start-up current source (5mA typical). |
| NC (Pins 7,8) | No connection | Pins 7 and 8 are unassigned in SOIC8-7A; must be left floating - no routing or soldering permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Hybrid CCM/DCM dimming mode | Maintains TRIAC latching current across full dimming range while achieving >0.7 PF - eliminates pop-on/pop-off and improves low-end linearity. |
| Integrated 500V MOSFET | Enables single-stage, non-isolated topology with no external HV switch - reduces BOM count and board space in A19/GU10 form factors. |
| Programmable over-voltage protection | VOVP threshold fixed at 2.0V, but trip point set externally via R2/R3 divider - allows precise output voltage clamping without trimming IC. |
| Thermal foldback with hysteresis | Reduces LED current gradually above 145°C and shuts down at 160°C; resumes at 110°C - prevents visible flicker during thermal stress. |
| Leading edge blanking (200ns) | Blocks false current-sense triggering during MOSFET turn-on - ensures reliable PWM timing despite parasitic ringing in compact layouts. |
Applications
| A19 Residential Bulbs | GU10 Commercial Spotlights |
|---|---|
|
Use Scenario: Retrofit LED replacement for incandescent A19 bulbs operating on standard 120VAC household circuits with leading-edge TRIAC dimmers. IC Role / Device Role / Timing Role: Constant-current LED driver implementing hybrid CCM/DCM switching to sustain TRIAC holding current and prevent dropout at low dim levels. Use Value: Delivers flicker-free dimming from 10% to 100% with <5% current variation, enabled by internal 0.195V reference and thermal foldback. |
Use Scenario: Directional LED spotlight in retail or office environments requiring smooth dimming compatibility with legacy wall-mounted TRIAC dimmers. IC Role / Device Role / Timing Role: Non-isolated buck-boost controller regulating 160mA output at 50V while maintaining >0.7 power factor across 108–132VAC input range. Use Value: Achieves 10W output in <1 cm² PCB area using single-winding inductor and integrated 500V MOSFET - lowers system cost vs. isolated alternatives. |
| PAR30/38 Downlights | Dimmable LED Tubes (120VAC) |
|
Use Scenario: High-lumen PAR30/38 retrofit lamps where thermal density limits heatsink volume and ambient temperatures exceed 60°C. IC Role / Device Role / Timing Role: Thermal-protection coordinator - initiates current foldback at 145°C junction temperature and fully shuts down at 160°C with 50°C hysteresis. Use Value: Prevents visible brightness drop or flicker during sustained high-temp operation - critical for enclosed fixtures with limited airflow. |
Use Scenario: Direct-wire LED tube replacements for fluorescent fixtures powered from 120VAC branch circuits with TRIAC-based dimming controls. IC Role / Device Role / Timing Role: Single-chip LED driver supporting buck topology with programmable OVP to protect against open-circuit LED string failure. Use Value: Enables safe hiccup-mode recovery from OVP faults via internal 18μA VCC discharge and regulated re-charge cycle - no external reset required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TRIAC-dimmable, non-isolated LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP4067GS-Z | Same SOIC8-7A package and hybrid dimming architecture, but rated for 400V MOSFET and lower 8W output power. | Suitable for lower-power A19 bulbs (<8W) where 500V surge margin is not required; lacks thermal foldback hysteresis spec. | Select when BOM cost reduction is prioritized over 10W headroom and precise thermal recovery behavior. |
| BP5609D | External MOSFET required; no integrated HV switch; uses fixed-frequency PWM instead of hybrid mode; 0.5% current accuracy. | Better suited for industrial-grade luminaires needing field-replaceable FETs; dimming performance less consistent below 20% duty. | Choose when serviceability or higher precision current regulation outweighs integration and dimming smoothness requirements. |
Compared with MP4068GS-Z, MP4067GS-Z trades 2W output headroom and thermal hysteresis for lower unit cost, while BP5609D sacrifices integration and dimming linearity to achieve tighter current tolerance and modular repairability.
Availability
MP4068GS-Z is available at Aetrix Electronics and suitable for residential LED bulb manufacturing, commercial GU10 spotlight production, and PAR30/38 downlight assembly requiring stable component supply with full traceability and lifecycle continuity.
Supply support for MP4068GS-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, LED drivers, and motor control solutions.
The MP4068 product line targets cost-sensitive, non-isolated LED lighting applications in North America, emphasizing TRIAC dimmer compatibility, minimal external components, and thermal robustness in compact form factors.
FAQ
What is the minimum off-time limit for MP4068GS-Z during normal operation?
The minimum off-time limit is 7 μs under steady-state conditions, as confirmed in the Electrical Characteristics table. During soft-start, it decreases stepwise from 24 μs to 12 μs before settling at 7 μs over 32 switching cycles - this prevents inrush current and ensures safe startup into capacitive LED loads.
Can MP4068GS-Z operate with a 230VAC input?
No - MP4068GS-Z is explicitly designed for 108–132VAC low-line applications. Its integrated 500V MOSFET and internal HV regulator are characterized only for 120VAC systems; attempting 230VAC risks exceeding absolute maximum ratings and invalidating protection features like OVP and thermal shutdown.
How is over-voltage protection triggered and recovered?
OVP triggers when voltage on OVF exceeds 2.0V (typical) for longer than 32 μs, causing immediate shutdown. Recovery occurs in hiccup mode: VCC discharges via 18μA internal sink until it drops to 2.35V, then the HV regulator recharges it to 4.65V - cycle repeats until fault clears, with no external intervention needed.
What is the purpose of the NC pins in SOIC8-7A package?
Pins 7 and 8 are designated No Connection in the SOIC8-7A variant and must remain unconnected - they serve no electrical function and are not bonded internally. Routing traces or applying solder to these pins violates the package specification and may compromise thermal or EMI performance.
Does MP4068GS-Z support both buck and buck-boost topologies?
Yes - the datasheet confirms support for both topologies in Typical Application sections. Buck configuration is used for step-down operation (e.g., 120VAC → 50V LED string); buck-boost enables wider output voltage flexibility, including outputs exceeding input peak voltage, using the same IC and pinout.
What is the recommended freewheeling diode for MP4068GS-Z designs?
An ultrafast diode with reverse recovery time <75ns is required - examples include WUGC10JH and ES1G. Slow diodes cause excessive current spikes during MOSFET turn-on due to long trr, degrading efficiency and potentially violating EMI limits or triggering false SCP events.
How does the internal HV regulator manage VCC during TRIAC dimming phases?
The HV regulator activates only when the TRIAC is conducting and VCC falls below 4.4V (VCCON), charging the external 2.2μF capacitor. During dimmer off-time, VCC sustains from stored charge - if it drops below 3.4V (VCCSTOP), the IC halts switching until recharge completes, preventing erratic behavior during deep dimming.
MP4068GS-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.1V
- Voltage - Supply (Max):
- 5V
- Voltage - Output:
- 50V
- Current - Output / Channel:
- 160mA
- Frequency:
- 22kHz
- Dimming:
- Triac
- Applications:
- Lighting
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-7A
MP4068GS-Z FAQ
1.How can I place an order for MP4068GS-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4068GS-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 MP4068GS-Z reliable?
The price and inventory of MP4068GS-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4068GS-Z is usually 5 days.
3.What payment methods are accepted for MP4068GS-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4068GS-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4068GS-Z?
MP4068GS-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4068GS-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 MP4068GS-Z?
For technical support, including MP4068GS-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4068GS-Z requirements.
6.How does Aetrix verify that MP4068GS-Z is sourced from the original manufacturer or authorized distributors?
All MP4068GS-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 MP4068GS-Z meets industry standards.
7.What is the process for return or replacement of MP4068GS-Z?
All MP4068GS-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4068GS-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 MP4068GS-Z part is unused and in its original packaging.
Return procedure for MP4068GS-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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