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Monolithic Power Systems Inc. MP24875DN-LF-Z
- Part No.:
- MP24875DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP24875DN-LF-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 1.5A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:4,865
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Product details
Overview
MP24875DN-LF-Z from Monolithic Power Systems is a fixed-frequency, peak-current-mode step-down LED driver IC integrating a 220mΩ high-side 55V MOSFET, delivering up to 1.5A constant current for high-power LED strings. It operates from 4.5V–55V input, supports programmable switching frequency up to 200kHz via external resistor, and features 200mV reference voltage for precise current regulation in automotive lighting and industrial signage.
For engineers reviewing the MP24875DN-LF-Z datasheet, MP24875DN-LF-Z pinout, MP24875DN-LF-Z application, or MP24875DN-LF-Z equivalent, key selection criteria include its 1.5A output capability, SOIC8E thermal performance (θJC = 10°C/W), shutdown quiescent current of 12µA, and compatibility with ceramic-output-capacitor designs requiring stable LED current regulation under wide VIN ranges.
Technical Context
The MP24875DN-LF-Z implements peak-current-mode control with a 200mV internal reference and 130µA quiescent supply current, enabling fast loop response and accurate LED current regulation across input voltages from 4.5V to 55V. Its error amplifier delivers 400V/V gain and 350µA/V transconductance, with COMP pin clamped between 0.9V and 2.0V during operation.
Switching frequency is set externally via resistor-to-ground on FREQ pin (e.g., 495kΩ for 200kHz), and thermal shutdown activates at 150°C with 20°C hysteresis. The bootstrap driver charges BST–SW capacitor to ~4V using VIN, with UVLO protection (rising threshold 2.2V) and soft-start ramping SS from 0V to 2.6V to prevent LED current overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports direct connection to 12V/24V/48V automotive and industrial rails without pre-regulation. |
| Max Output Current | 1.5A - enables driving high-brightness LED strings (e.g., 10×WLED @ 330mA or 3×@700mA) with minimal external components. |
| Switching Frequency | Up to 200kHz - programmable via RFREQ to avoid EMI-sensitive bands while maintaining inductor size efficiency. |
| Feedback Reference | 200mV ±12mV - low-voltage sensing reduces power loss in current-sense resistor (e.g., 287mΩ for 700mA). |
| High-Side RDS(on) | 220mΩ - integrated MOSFET eliminates external switch, simplifying layout and improving thermal coupling to exposed pad. |
| Quiescent Current | 130µA - ensures minimal standby loss in always-on lighting systems; drops to 12µA in shutdown mode. |
| Thermal Resistance θJA | 50°C/W - SOIC8E package with exposed pad enables >2.5W continuous dissipation at +25°C ambient. |
Pinout & Package
MP24875DN-LF-Z uses an SOIC8 with exposed pad (SOIC8E), where the exposed pad must be soldered to a PCB ground plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | Drives external Schottky rectifier; high di/dt node requiring short trace routing to minimize ringing and EMI. |
| 2 EN | Enable Input | Positive-logic control (1.5V rising threshold); floating state enables device via internal 1µA pull-up. |
| 3 COMP | Compensation Output | Error amplifier output; connects to RC network for loop stability-clamped 0.9V–2.0V during operation. |
| 4 FB | Current Sense Feedback | Compares voltage across external sense resistor to 200mV reference to regulate LED current. |
| 5 GND / Exposed Pad | Power & Signal Ground | Primary return path for high-current switch and control circuits; exposed pad must connect to solid GND plane. |
| 6 FREQ | Frequency Programming | Resistor-to-GND sets oscillator frequency (e.g., 495kΩ → 200kHz); requires parallel 1nF decoupling cap. |
| 7 VIN | Main Supply Input | Powers internal regulators and high-side driver; requires local 0.1µF ceramic + bulk capacitor near pin. |
| 8 BST | Bootstrap Supply | Charges external BST capacitor (BST–SW) to ~4V; critical for high-side gate drive during duty cycles >50%. |
Key Features
| Feature | Design Value |
|---|---|
| Ceramic capacitor stable | Supports full-range output capacitance (2.2µF–4.7µF X7R) without oscillation-eliminates need for tantalum/electrolytic. |
| Internal soft-start | 0.18ms controlled ramp prevents LED current overshoot at startup and short-circuit recovery. |
| Peak-current-mode control | Enables inherent cycle-by-cycle current limiting and simplified compensation with single-pole-zero network on COMP pin. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and re-enables at 130°C-prevents thermal runaway in enclosed fixtures. |
| Low shutdown current | 12µA typical shutdown supply current enables battery-backed emergency lighting and always-on automotive modules. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 6–12 series-connected white LEDs in 12V/24V vehicle headlamp modules with PWM dimming. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current independent of forward voltage drift and battery voltage variation. Use Value: Maintains consistent lumen output across -40°C to +125°C junction range while meeting automotive EMI limits via 200kHz programmable switching. |
Use Scenario: Powering multi-string high-lumen LED arrays in warehouse ceiling fixtures powered from 48V DC distribution rails. IC Role / Device Role / Timing Role: Primary current regulator in isolated or non-isolated LED driver stage, interfacing with upstream AC/DC or PoE-powered front-end. Use Value: Delivers 97.5% peak efficiency at 44V input/330mA load, reducing thermal load in thermally constrained metal-housed fixtures. |
| Streetlight LED Module | Emergency Exit Sign Illumination |
Use Scenario: Outdoor LED streetlight with 36V–55V nominal input, requiring robust operation under wide ambient temperature and line surges. IC Role / Device Role / Timing Role: Core LED current controller with built-in UVLO (3.0V rising), thermal shutdown, and 55V absolute max VIN rating. Use Value: Survives load-dump transients up to 60V and sustains regulated current during brownouts down to 4.5V input. |
Use Scenario: Battery-backed exit sign using LiFePO₄ or lead-acid backup, requiring ultra-low quiescent current during standby. IC Role / Device Role / Timing Role: LED driver activated only during AC failure, controlled by microcontroller EN signal and monitored via FB feedback. Use Value: Draws just 12µA in shutdown-enabling >1 year battery runtime in maintenance-free emergency lighting systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3474EMS#TRPBF | Fixed 1.3MHz frequency, 40V max VIN, 1.2A max IOUT, requires external MOSFET. | Better suited for compact, high-frequency designs with lower voltage rails; lacks integrated 55V switch. | Select when board space is constrained and input ≤40V; accept higher BOM count and reduced thermal efficiency. |
| TPS92630QPWPRQ1 | Automotive-grade AEC-Q100, 65V max VIN, 1.5A, integrated PWM dimming logic, no FREQ programming. | Designed for ASIL-B automotive lighting with diagnostic flags; fixed 500kHz switching, no frequency tuning. | Select for safety-critical automotive applications requiring fault reporting and qualification; trade off EMI flexibility. |
Compared with LT3474EMS#TRPBF and TPS92630QPWPRQ1, MP24875DN-LF-Z uniquely balances 55V operation, integrated 220mΩ MOSFET, programmable 200kHz switching, and SOIC8E thermal performance-making it optimal for cost-sensitive, thermally demanding industrial and commercial LED drivers where design flexibility outweighs automotive certification needs.
Availability
MP24875DN-LF-Z is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, and outdoor streetlight systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP24875DN-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MP24875 belongs to MPS's high-voltage LED driver product line, designed specifically for efficient, thermally robust constant-current regulation in automotive, industrial, and architectural lighting where wide-input-voltage tolerance and integrated power stages reduce system complexity.
FAQ
What is the minimum input voltage required for MP24875DN-LF-Z to start switching?
The MP24875DN-LF-Z has a UVLO rising threshold of 3.0V, but functional operation begins only when VIN exceeds 4.5V-the specified minimum operating input voltage. Below 4.5V, the internal regulator cannot sustain stable bias, and the error amplifier output (COMP) remains uncontrolled, preventing reliable current regulation even if EN is asserted.
Can MP24875DN-LF-Z drive LEDs in a common-anode configuration?
No-MP24875DN-LF-Z is a buck (step-down) constant-current controller with high-side switch and grounded cathode sensing. It requires the LED string cathodes to connect to GND and anodes to the output (via rectifier), making it compatible only with common-cathode configurations. Common-anode topologies require boost or SEPIC drivers.
How does the 200mV feedback reference improve efficiency compared to 1V references?
A 200mV reference reduces power loss in the current-sense resistor by 5× versus a 1V reference (e.g., 287mΩ vs. 1.43Ω for 700mA). This directly lowers I²R heating, improves thermal margin, and allows smaller, cheaper resistors-critical for high-current LED drivers where sense resistor dissipation dominates PCB thermal design.
Is an external bootstrap diode necessary for reliable operation?
An external bootstrap diode (e.g., BAT54) is recommended-not required-when VIN ≤5V, VOUT is 3.3–5V, or duty cycle exceeds 75%, as these conditions limit natural BST capacitor recharge time. In standard 12V–48V automotive lighting, the internal charging path suffices; the diode adds redundancy and improves light-load efficiency.
What is the maximum allowable LED string forward voltage?
The maximum LED string forward voltage is VIN – VSW(on) – VF(diode), limited practically by the 55V absolute max VIN rating and typical Schottky drop (~0.4V). At 55V input, up to ~52V LED string voltage is feasible (e.g., 16×3.2V white LEDs), provided inductor DCR and layout losses remain within thermal limits.
Does MP24875DN-LF-Z support analog dimming via the COMP pin?
No-COMP is the error amplifier output used exclusively for loop compensation and is internally clamped. Dimming must be implemented externally via PWM applied to the EN pin (as shown in typical application waveforms) or by modulating the FB reference using a DAC-controlled current source in series with RFB.
Why does the datasheet specify "Ceramic capacitor stable" as a feature?
This indicates the control loop remains unconditionally stable with low-ESR ceramic output capacitors (2.2–4.7µF X7R), eliminating reliance on higher-ESR electrolytics or tantalums. That simplifies BOM, improves reliability, avoids aging-related capacitance drift, and enables smaller, cooler-running designs-especially vital in sealed LED fixtures.
MP24875DN-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 55V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.5A (Switch)
- Frequency:
- 200kHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP24875DN-LF-Z FAQ
1.How can I place an order for MP24875DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP24875DN-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 MP24875DN-LF-Z reliable?
The price and inventory of MP24875DN-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 MP24875DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP24875DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP24875DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP24875DN-LF-Z?
MP24875DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP24875DN-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 MP24875DN-LF-Z?
For technical support, including MP24875DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP24875DN-LF-Z requirements.
6.How does Aetrix verify that MP24875DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP24875DN-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 MP24875DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP24875DN-LF-Z?
All MP24875DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP24875DN-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 MP24875DN-LF-Z part is unused and in its original packaging.
Return procedure for MP24875DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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