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Monolithic Power Systems Inc. MP4050AGJ-Z
- Part No.:
- MP4050AGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP4050AGJ-Z.pdf
- Description:
- IC LED DRIVER OFFL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,205
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Product details
Overview
MP4050AGJ-Z from Monolithic Power Systems is a non-isolated, constant-current LED driver IC with an integrated 500V/8Ω MOSFET, designed for AC/DC LED bulb replacement. It delivers precise 115mA output current from universal 85–265VAC input, operates above 22kHz to suppress audible noise, and includes thermal foldback (145°C start), open-LED protection, and VCC under-voltage lockout (4.1–4.75V hysteresis).
For engineers reviewing the MP4050AGJ-Z datasheet, MP4050AGJ-Z pinout, MP4050AGJ-Z application, or MP4050AGJ-Z equivalent, key selection criteria include its TSOT23-5 package footprint, internal HV startup current source, 0.196V feedback reference for current sensing, thermal shutdown with 50°C hysteresis, and compatibility with high-side buck topology for cost-sensitive lighting designs.
Technical Context
The MP4050AGJ-Z implements average current-mode control using an internal sampling capacitor compared against a 0.196V reference to regulate LED current. Its switching frequency is dynamically adjusted above 22kHz via peak-current limiting to avoid acoustic noise, with minimum off-time (4.7μs) and maximum on-time (25μs) constraints defining DCM operation boundaries.
Thermal management integrates two-stage protection: current foldback begins at 145°C junction temperature, reducing output power progressively; full shutdown occurs at 160°C with auto-restart hysteresis (recovery at 110°C). Open-LED detection uses the PRO pin with 2V threshold and 32μs comparator time constraint, operating in hiccup mode with VCC discharge/recharge cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current Accuracy | ±5% typical over -40°C to +125°C - enables stable brightness without external trimming. |
| Integrated MOSFET | 500V breakdown, 8Ω RDS(ON) at 10mA - supports direct connection to rectified AC line without external HV switch. |
| Feedback Reference Voltage | 0.196V ±0.009V - sets LED current via external sense resistor (e.g., 1.7Ω yields ~115mA). |
| Switching Frequency Range | 22kHz minimum - eliminates audible coil whine in consumer lighting applications. |
| Thermal Foldback Threshold | 145°C - initiates gradual current reduction before critical junction temperature is reached. |
| VCC UVLO Hysteresis | 0.24V - ensures clean start-up and shutdown sequencing during brownout conditions. |
| PRO Over-Voltage Threshold | 2.0V ±0.15V - triggers open-LED protection when voltage exceeds this level during MOSFET off-time. |
Pinout & Package
MP4050AGJ-Z is housed in a thermally enhanced TSOT23-5 surface-mount package with exposed drain pad for improved heat dissipation. The 5-pin layout supports compact, non-isolated buck LED driver layouts with minimal external components.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal bias supply input | Accepts 4.1–5.0V regulated supply; powers control logic and gate driver; bypassed externally with bulk capacitor. |
| PRO | Open-LED fault detection input | Monitors voltage across LED string during MOSFET off-time; triggers hiccup-mode protection if >2.0V. |
| GND | Signal and power ground reference | Common return for control circuitry and current-sense resistor; must be low-impedance path to minimize noise coupling. |
| SOURCE | MOSFET source & current-sense node | Connects to external sense resistor (SOURCE–GND); provides feedback for average current regulation. |
| DRAIN | Integrated MOSFET drain & HV startup input | Directly connects to rectified AC line; supplies internal VCC regulator via HV current source when VCC is low. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 500V MOSFET | Eliminates need for external HV switch, reducing BOM count and PCB area in retrofit LED bulbs. |
| Internal HV startup current source | Draws 5mA from DRAIN at 100V to charge VCC capacitor - enables self-start without auxiliary winding or transformer. |
| 200ns leading edge blanking | Blocks false current-sense triggering during MOSFET turn-on, improving reliability in noisy high-dv/dt environments. |
| Thermal foldback with hysteresis | Reduces LED current linearly above 145°C and shuts down fully at 160°C, then auto-restarts at 110°C - prevents thermal runaway without manual reset. |
| Audible noise restraint | Maintains switching frequency ≥22kHz under all load/line conditions - avoids perceptible buzzing in residential lighting. |
Applications
| LED Retrofit Bulbs | Industrial Panel Indicators |
|---|---|
Use Scenario: Direct replacement of incandescent A19 bulbs using universal 85–265VAC input with no isolation barrier. IC Role / Device Role / Timing Role: Constant-current controller implementing high-side buck topology with integrated MOSFET and HV startup. Use Value: Enables <5mm board height and <$0.15 BOM cost per watt while meeting IEC61000-4-5 1kV surge immunity with minimal external components. | Use Scenario: Status indication in factory HMIs where ambient temperature exceeds 85°C and EMI must remain below CISPR-11 Class B limits. IC Role / Device Role / Timing Role: Non-isolated LED driver with thermal foldback and short-circuit protection for continuous-duty signaling. Use Value: Maintains consistent luminance across –40°C to +105°C ambient via 0.196V precision reference and 50°C thermal hysteresis, eliminating brightness drift. |
| Architectural Accent Lighting | Automotive Interior Ambient Lighting |
Use Scenario: Low-profile linear LED strips mounted behind aluminum extrusions in commercial retail displays. IC Role / Device Role / Timing Role: High-efficiency constant-current source driving 13-series LEDs at 40V/115mA from 230VAC rectified input. Use Value: Achieves >85% efficiency at full load with 22kHz switching, preventing audible resonance in resonant metal enclosures. | Use Scenario: 12V DC-powered interior dome lights requiring robust OVP/SCP in automotive-grade temperature cycling (-40°C to +105°C). IC Role / Device Role / Timing Role: DC/DC LED driver with open-LED hiccup mode and short-circuit foldback for battery-supplied systems. Use Value: Survives load dump transients up to 36V via 500V MOSFET rating and maintains safe thermal operation through repeated SCP events without latch-off. |
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 |
|---|---|---|---|
| MP4050AGS-Z | Same die in SOIC-8 package; θJA = 96°C/W vs. 100°C/W for TSOT23-5; adds NC pins for layout flexibility. | Better thermal performance in forced-air or heatsinked designs; larger footprint accommodates higher-power layouts. | Select when board space allows and thermal margin is critical; not drop-in compatible due to different pinout and package size. |
| AL8862SP-13 | 40V max output, no integrated MOSFET; requires external 500V FET; lacks internal HV startup source. | Needs auxiliary winding or external HV supply; less suitable for ultra-low-cost bulb replacements. | Choose only if system already includes isolated auxiliary supply and design prioritizes flexibility over integration. |
Compared with MP4050AGS-Z, the MP4050AGJ-Z offers superior board-area efficiency and identical electrical performance but trades 0.4°C/W higher thermal resistance for 60% smaller footprint; versus AL8862SP-13, it delivers full integration and self-start capability at the cost of fixed topology - making it optimal for space-constrained, cost-driven AC-input LED drivers.
Availability
MP4050AGJ-Z is available at Aetrix Electronics and suitable for LED retrofit bulbs, industrial panel indicators, and architectural accent lighting requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP4050AGJ-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 leadership in DC/DC conversion and LED driver innovation.
The MP4050A product line targets cost-sensitive, non-isolated LED lighting applications where integration, thermal resilience, and audible-noise-free operation are mandatory - delivering single-chip solutions for global AC mains-powered LED products.
FAQ
What is the minimum input voltage required for reliable start-up?
The MP4050AGJ-Z starts reliably when the rectified DC input exceeds 40V, enabled by its internal high-voltage current source drawing from the DRAIN pin. Below this threshold, the VCC capacitor cannot charge sufficiently to reach the 4.3V UVLO turn-on level, causing failed start-up or intermittent operation in low-line conditions.
Can MP4050AGJ-Z drive more than 13 LEDs in series?
No - the device's maximum output voltage is limited to approximately 40V under typical conditions (13×3.0V LED forward voltage), constrained by internal current-sense amplifier headroom and thermal limits. Driving more LEDs increases VOUT, raising power dissipation in the integrated MOSFET beyond its 1.25W TSOT23-5 rating and triggering thermal foldback prematurely.
How does the PRO pin detect open-LED faults?
The PRO pin monitors voltage across the LED string during MOSFET off-time. When the LED string opens, PRO rises above 2.0V, triggering the OVP comparator after a 32μs validation window. This initiates hiccup-mode protection: the IC stops switching, discharges VCC via an 18μA sink, and recharges VCC until normal operation resumes - preventing sustained overvoltage stress.
Is an external freewheeling diode mandatory?
Yes - the MP4050AGJ-Z requires an external ultrafast diode (e.g., WUGC10JH, trr < 75ns) connected between SOURCE and LED+ to provide current path during MOSFET off-time. The integrated MOSFET lacks body diode conduction capability, and slow diodes cause excessive current spikes, reduced efficiency, and potential failure due to reverse recovery losses.
What is the purpose of the 200ns leading edge blanking (LEB)?
The 200ns LEB disables the current-sense comparator immediately after MOSFET turn-on to ignore parasitic ringing caused by drain-source capacitance discharge. Without LEB, false overcurrent triggering would occur, limiting duty cycle and reducing output power - especially critical in high-frequency, high-dv/dt buck topologies.
Does MP4050AGJ-Z support dimming functionality?
No - the MP4050AGJ-Z lacks dedicated PWM or analog dimming inputs. Its output current is fixed by the external sense resistor and internal 0.196V reference. Dimming requires external circuitry such as series MOSFET PWM switching or current-source modulation upstream of the LED string, which may compromise efficiency and thermal performance.
What is the recommended PCB copper area for DRAIN connection?
Maximize the copper area connected to the DRAIN pin - it serves as both the HV input node and primary thermal path. For TSOT23-5, use ≥25 mm² of 2-oz copper tied directly to the DRAIN pad and extended to board edges or internal planes. This reduces thermal resistance by up to 15°C/W and improves surge handling by lowering inductance in the high-current path.
MP4050AGJ-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
- 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:
- TSOT-23-5
MP4050AGJ-Z FAQ
1.How can I place an order for MP4050AGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4050AGJ-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 MP4050AGJ-Z reliable?
The price and inventory of MP4050AGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4050AGJ-Z is usually 5 days.
3.What payment methods are accepted for MP4050AGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4050AGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4050AGJ-Z?
MP4050AGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4050AGJ-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 MP4050AGJ-Z?
For technical support, including MP4050AGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4050AGJ-Z requirements.
6.How does Aetrix verify that MP4050AGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP4050AGJ-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 MP4050AGJ-Z meets industry standards.
7.What is the process for return or replacement of MP4050AGJ-Z?
All MP4050AGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4050AGJ-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 MP4050AGJ-Z part is unused and in its original packaging.
Return procedure for MP4050AGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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