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Monolithic Power Systems Inc. MP4050AGS
- Part No.:
- MP4050AGS
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP4050AGS.pdf
- Description:
- IC LED DRIVER OFFL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,439
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Product details
Overview
MP4050AGS from Monolithic Power Systems is a non-isolated, constant-current LED driver IC with an integrated 500V/8Ω MOSFET, designed for AC/DC and DC/DC high-brightness LED bulb replacement. It delivers precise 115mA output current from universal AC (85–265VAC) or DC input, operates above 22kHz to suppress audible noise, and features thermal current foldback at 145°C and shutdown at 160°C. Used in compact, cost-sensitive general illumination systems.
For engineers reviewing the MP4050AGS datasheet, MP4050AGS pinout, MP4050AGS application, or MP4050AGS equivalent, key selection criteria include its integrated HV MOSFET, VCC self-start capability from DRAIN, PRO-based open-LED protection, thermal foldback behavior, and SOIC-8 package suitability for thermally constrained LED retrofit designs.
Technical Context
The MP4050AGS implements a high-side buck topology with internal averaging current feedback, where LED current is regulated by comparing the SOURCE-sensed voltage against a 0.196V reference (VREF). Its switching frequency is dynamically controlled to stay ≥22kHz, reducing acoustic noise while maintaining regulation via peak-current limiting and minimum off-time (4.7μs) enforcement.
Protection logic integrates multiple independent fault responses: OLP triggers hiccup-mode restart upon PRO voltage exceeding 2.0V during MOSFET off-time; SCP extends off-time under short-circuit conditions; and thermal foldback begins at 145°C, reducing output current before full shutdown at 160°C with 50°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR(DSS) | 500V - Enables direct connection to rectified AC line without external HV MOSFET. |
| RDS(ON) | 8Ω - Defines conduction loss and thermal dissipation in high-side switch; impacts max power handling in SOIC-8 (1.3W). |
| VREF | 0.196V - Sets LED current via IOUT = VREF/RS; enables accurate 1% sensing resistor use. |
| fSW(min) | >22kHz - Ensures silent operation by avoiding audible frequency band; enforced via peak-current reduction. |
| TSTART | 145°C - Thermal foldback initiation temperature; reduces output current to limit junction temperature rise rate. |
| VOVP | 2.0V - Open-LED detection threshold on PRO pin; triggers hiccup-mode recovery when exceeded during off-time. |
| tLEB | 200ns - Internal leading-edge blanking duration; prevents false current-sense triggering from parasitic ringing. |
Pinout & Package
MP4050AGS is housed in an SOIC-8 package with exposed pad (not electrically connected), optimized for thermal dissipation in LED driver PCB layouts. Pin 1 (VCC) supplies control circuitry; Pin 2 (PRO) monitors open-LED faults; Pin 3 (GND) serves as signal and gate-drive reference; Pin 4 (SOURCE) connects to current-sense resistor; Pin 5 and Pin 7 (DRAIN) carry high-voltage switching node and HV startup current; Pins 5, 6, and 8 are no-connect.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Internal regulator supply input | Bypassed with bulk capacitor; self-powered from DRAIN during startup; regulated between 4.55V (normal) and 4.65V (turn-off threshold). |
| 2 - PRO | Open-LED fault sense input | Detects overvoltage (>2.0V) during MOSFET off-time; initiates hiccup-mode restart if open LED occurs. |
| 3 - GND | Signal and gate-drive reference | Common return for control logic, gate drive, and current-sense resistor; must be low-inductance path. |
| 4 - SOURCE | MOSFET source & current-sense node | Connects to ground via RS; voltage drop across RS sets LED current via internal 0.196V reference. |
| 5, 7 - DRAIN | HV MOSFET drain & startup current source | Carries full input voltage (up to 500V); provides internal HV current (~5mA) to charge VCC capacitor at startup. |
| 5, 6, 8 - NC | No connection | Not internally bonded; must remain unconnected per datasheet to avoid malfunction or reliability risk. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 500V MOSFET | Eliminates need for external HV switch, reducing BOM count and board space in non-isolated LED drivers. |
| Self-starting HV current source | Draws startup current directly from DRAIN, enabling operation without auxiliary winding or external bias supply. |
| Thermal current foldback | Gradually reduces LED current above 145°C to manage thermal stress before hard shutdown at 160°C. |
| 200ns internal LEB | Suppresses false triggering from switching-node transients, improving reliability in high-dV/dt LED applications. |
| Hiccup-mode OLP | Repeats VCC discharge/charge cycles during open-LED fault, limiting average power dissipation and enabling auto-recovery. |
Applications
| Smart Residential LED Bulbs | Industrial Panel Indicator Lights |
|---|---|
Use Scenario: Retrofit A19 LED bulbs operating directly from 120/230VAC mains with no isolation transformer. IC Role / Device Role / Timing Role: High-side buck controller regulating constant 115mA through 13-series LEDs; manages startup, regulation, and thermal derating autonomously. Use Value: Enables <15mm height bulb designs using SOIC-8 footprint and eliminates external HV MOSFET, reducing total solution cost by ~$0.12. | Use Scenario: Status lighting on industrial HMIs and PLC enclosures requiring long-life, flicker-free illumination. IC Role / Device Role / Timing Role: Constant-current driver powering 7–13 white LEDs from 24VDC or rectified AC; maintains stable brightness across ambient temperatures from −40°C to +85°C. Use Value: Delivers ±3% LED current accuracy over temperature via 0.196V reference and 1% RS, ensuring consistent luminance without microcontroller compensation. |
| Commercial Downlight Modules | Automotive Interior Ambient Lighting |
Use Scenario: 12W non-dimmable downlights for office ceilings using universal AC input and aluminum-core PCBs. IC Role / Device Role / Timing Role: Primary LED current regulator in high-side buck configuration; handles thermal load via SOIC-8 θJA = 96°C/W and foldback at 145°C. Use Value: Supports continuous 1.3W dissipation in SOIC-8, enabling >85% efficiency at 40V/115mA output without heatsink in thermally optimized layouts. | Use Scenario: Low-power cabin accent lighting powered from 12VDC vehicle battery with EMI constraints. IC Role / Device Role / Timing Role: DC/DC LED driver converting 12V to 24V@60mA for RGBW strips; leverages 22kHz+ switching to avoid AM radio band interference. Use Value: Meets CISPR-25 Class 5 radiated emissions limits due to controlled dV/dt, internal LEB, and minimal external component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP4050AGJ | Same die, TSOT23-5 package; lower thermal capacity (1.25W vs. 1.3W), higher θJA (100°C/W). | Targeted for ultra-compact bulbs (<10mm height); limited to lower power or forced-air-cooled environments. | Select AGJ only when board space is critical and thermal margin allows ≤1.0W continuous dissipation. |
| MPQ4050AGS-AEC1 | Automotive-grade variant; same SOIC-8 package but qualified to AEC-Q100 Grade 1 (−40°C to +125°C). | Required for under-hood or dashboard lighting with extended temperature and reliability requirements. | Choose AEC1 version only when automotive qualification, enhanced ESD (3kV HBM), or extended temp range is mandatory. |
Compared with MP4050AGS, MP4050AGJ trades thermal robustness for size reduction, while MPQ4050AGS-AEC1 adds automotive qualification at no change to electrical specs-making AGS optimal for industrial/commercial AC-driven LED modules needing reliable SOIC-8 thermal performance.
Availability
MP4050AGS is available at Aetrix Electronics and suitable for smart residential LED bulbs, industrial panel indicator lights, and commercial downlight modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP4050AGS 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 MP4050A product line targets cost-sensitive, non-isolated LED lighting applications, delivering integrated HV switching, thermal resilience, and simplified bill-of-materials for retrofit and OEM lamp manufacturers.
FAQ
What is the maximum input voltage the MP4050AGS can withstand on the DRAIN pin?
The MP4050AGS has a guaranteed breakdown voltage of 500V on the DRAIN-to-SOURCE terminal, verified across temperature and process corners. This rating allows direct connection to rectified 230VAC mains (peak ~325V) with sufficient margin for surge events up to 1.5kV differential, provided proper input capacitance and MOV protection are implemented per Figure 9 in the datasheet.
How does the MP4050AGS achieve constant LED current without an external op-amp or DAC?
The MP4050AGS uses an internal averaging current feedback loop that compares the voltage across the external SOURCE-to-GND sense resistor against a precision 0.196V internal reference (VREF). The control logic adjusts MOSFET on-time to maintain this reference voltage, yielding IOUT = 0.196V / RS. No external compensation components are required, as loop stability is embedded in the IC's architecture.
Can the MP4050AGS operate from a 12VDC input, and what changes are needed?
Yes-the MP4050AGS supports DC input operation. For 12VDC, reduce the input capacitor value (C2/C3) to avoid excessive hold-up time and ensure VIN_MIN_LIMIT remains above the calculated minimum (≈10V for typical inductor values). Also verify that the selected inductor maintains DCM operation above 22kHz; a 10–22μH value is typically appropriate for 12V input and 40V/115mA output.
What is the purpose of the PRO pin, and how is it configured for open-LED detection?
The PRO pin monitors the LED string voltage during MOSFET off-time. It connects to the LED anode via a resistor divider (R2/R3) referenced to SOURCE. When the divided voltage exceeds 2.0V, the IC detects an open LED and enters hiccup mode-discharging VCC via an 18μA sink until VCC drops below VCCPRO (2.35V), then restarting. R3 ≥100kΩ ensures minimal quiescent current impact.
Does the MP4050AGS support dimming, and if so, how?
The MP4050AGS does not include native PWM or analog dimming interfaces. However, external PWM dimming can be implemented by pulsing the VCC supply (via a MOSFET switch in series with the VCC capacitor) at frequencies >100Hz, leveraging the IC's built-in UVLO hysteresis (VCCOFF = 4.65V, VCCON = 4.4V) to enable/disable regulation. This method achieves >1000:1 dimming ratio with minimal added components.
How does thermal foldback behave as junction temperature rises from 145°C to 160°C?
At 145°C (TSTART), the MP4050AGS begins linearly reducing the internal current reference, lowering LED current proportionally. By 160°C (TSD), the reference drops to ~20% of nominal, effectively limiting power dissipation. If temperature exceeds 160°C, the IC latches off and remains inactive until junction temperature falls below 110°C (TSD − THYS), then resumes normal operation.
What layout practices are essential to meet EMI requirements in MP4050AGS designs?
Minimize the high-di/dt loop formed by DRAIN–inductor–freewheeling diode–output capacitor using tight copper pours and short traces. Place VCC and PRO bypass capacitors within 2mm of their respective pins. Route PRO feedback traces away from switching nodes and shield them with ground guard rings. Maximize DRAIN copper area for heat spreading, and keep SOURCE trace short and wide to reduce parasitic inductance affecting current sensing accuracy.
MP4050AGS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.1V
- Voltage - Supply (Max):
- 5V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 22kHz
- Dimming:
- -
- Applications:
- General Purpose, Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP4050AGS FAQ
1.How can I place an order for MP4050AGS through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4050AGS 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 MP4050AGS reliable?
The price and inventory of MP4050AGS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4050AGS is usually 5 days.
3.What payment methods are accepted for MP4050AGS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4050AGS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4050AGS?
MP4050AGS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4050AGS 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 MP4050AGS?
For technical support, including MP4050AGS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4050AGS requirements.
6.How does Aetrix verify that MP4050AGS is sourced from the original manufacturer or authorized distributors?
All MP4050AGS 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 MP4050AGS meets industry standards.
7.What is the process for return or replacement of MP4050AGS?
All MP4050AGS units undergo pre-shipment inspection (PSI). If there is an issue with MP4050AGS, 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 MP4050AGS part is unused and in its original packaging.
Return procedure for MP4050AGS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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