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Monolithic Power Systems Inc. MP24893DJ-LF-Z
- Part No.:
- MP24893DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP24893DJ-LF-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 1A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,175
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Product details
Overview
MP24893DJ-LF-Z from Monolithic Power Systems is a hysteretic-controlled step-down white LED driver IC with 6V–36V input range, internal 36V/1A MOSFET, 200mV average feedback voltage, and dual PWM/analog dimming via EN/DIM pin-designed for automotive LED lighting, emergency signage, and low-voltage halogen replacement systems.
For engineers reviewing the MP24893DJ-LF-Z datasheet, MP24893DJ-LF-Z pinout, MP24893DJ-LF-Z application, or MP24893DJ-LF-Z equivalent, key selection criteria include its 1000:1 PWM dimming resolution, TSOT23-5 package thermal limits (1.1W @ 25°C), hysteretic loop stability without compensation, and explicit "Not Recommended for New Designs" status per MPS Rev. 1.02.
Technical Context
The MP24893 operates in continuous conduction mode using high-side current sensing through an external resistor (RS) to regulate LED current with ±30mV hysteresis around 202mV reference. Its hysteretic control eliminates need for external compensation components and delivers sub-100ns response to load transients.
Dimming is implemented via the EN/DIM pin: analog dimming accepts 0.3V–2.5V DC to scale LED current from 25% to 200%, while PWM dimming uses 100Hz–2kHz square waves with minimum 1.5V amplitude; internal 1.275V reference and 45kΩ pull-up enable soft-start when capacitor is added to EN/DIM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 36V - supports 12V/24V automotive rails and industrial DC supplies without pre-regulation |
| Max Output Current | 1A - drives up to 3-series high-brightness white LEDs at full brightness |
| Feedback Voltage | 202mV ±30mV - low VSENSE minimizes power loss in current-sense resistor |
| PWM Dimming Ratio | 1000:1 - enables precise brightness control in architectural and emergency lighting |
| Min/Max On-Off Time | 100ns each - ensures stable operation at high switching frequencies (200–600kHz typical) |
| Thermal Shutdown | 150°C junction - protects against sustained overload in enclosed fixtures |
| UVLO Threshold | 5.9V rising, 700mV hysteresis - prevents erratic startup during brownout conditions |
Pinout & Package
MP24893DJ-LF-Z is packaged in TSOT23-5 (0.95mm pitch, 2.9×1.6mm footprint), optimized for space-constrained LED modules. Thermal resistance θJA = 110°C/W enables 1.1W continuous dissipation at +25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Drain of internal MOSFET | Connects to inductor and Schottky diode anode; handles peak switch current and high dv/dt |
| 2 (GND) | Power and signal ground | Reference for all internal circuits; must be low-impedance return path for RS and IN decoupling |
| 3 (EN/DIM) | Enable and dimming command input | Accepts 0.3–2.5V analog or 100Hz–2kHz PWM; internal 1.275V reference enables soft-start with external capacitor |
| 4 (RS) | High-side current-sense input | Measures voltage across external sense resistor to regulate LED current; routed with minimal trace length to reduce noise |
| 5 (IN) | Input supply pin | Connects to bulk input capacitor (10–22µF); requires low-ESR ceramic for high-frequency ripple suppression |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for external compensation network and provides instantaneous transient response |
| Integrated 36V MOSFET | Enables single-chip solution for 36V-input LED strings without external high-voltage switch |
| Dual dimming interface | Single EN/DIM pin supports both analog (0.3–2.5V) and PWM (100Hz–2kHz) without mode-select pins |
| Low 200mV feedback voltage | Reduces I²R loss in sense resistor by >75% vs. conventional 1V references, improving efficiency at 1A |
| Under-voltage lockout + thermal shutdown | Prevents operation below 5.3V and disables output above 150°C junction temperature |
Applications
| Automotive LED Headlamp Modules | Emergency Exit Sign Illumination |
|---|---|
Use Scenario: Driving 3-series white LEDs in 12V/24V vehicle electrical systems with variable battery voltage and engine cranking dips. IC Role / Device Role / Timing Role: Constant-current step-down LED driver with UVLO hysteresis and thermal foldback to maintain illumination during cold cranking (down to 6V). Use Value: Delivers stable 1A LED current across 6–36V input without external LDO or buck pre-regulator, reducing BOM count by one active component. | Use Scenario: Powering red/green LED arrays in UL 924-compliant exit signs requiring fail-safe dimming and >90-minute battery backup runtime. IC Role / Device Role / Timing Role: High-efficiency WLED driver enabling analog dimming to 25% brightness during standby and full PWM dimming during alarm activation. Use Value: 1000:1 PWM resolution and 202mV sense voltage extend battery life by minimizing sense resistor loss during low-current standby mode. |
| Low-Voltage Halogen Lamp Replacement | Architectural Accent Lighting |
Use Scenario: Retrofitting 12V AC/DC halogen fixtures with energy-efficient LED arrays in hospitality and retail environments. IC Role / Device Role / Timing Role: Direct replacement driver supporting legacy TRIAC-dimmable AC inputs via external rectification and smoothing. Use Value: Analog dimming range (0.3–2.5V) maps linearly to 25–200% LED current, enabling smooth compatibility with standard 0–10V wall dimmers. | Use Scenario: Controlling color-tuned white LED strips in museum display cases where flicker-free, low-noise dimming is critical. IC Role / Device Role / Timing Role: Hysteretic-controlled constant-current source eliminating switching noise that interferes with sensitive optical sensors. Use Value: No loop compensation required ensures immunity to layout-induced phase margin degradation, simplifying compliance with EMC Class B limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP24895DJ-LF-Z | Successor with improved thermal performance (θJA = 90°C/W), lower quiescent current (0.5mA), and extended dimming linearity | Recommended for new designs; supports same TSOT23-5 footprint but requires updated PCB layout for enhanced thermal pad exposure | Select for production ramps requiring long-term availability and higher efficiency at 125°C ambient |
| LM3409QMY/NOPB | Adjustable frequency (200kHz–2MHz), external MOSFET, no integrated switch; requires separate gate driver and sense amplifier | Suitable for >1A or >40V applications where MP24893's 36V/1A limits are exceeded | Choose when system-level flexibility (e.g., synchronous rectification, multi-string control) outweighs integration benefits |
Compared with MP24893DJ-LF-Z, MP24895DJ-LF-Z offers higher reliability in thermally constrained enclosures and longer design lifecycle, while LM3409QMY/NOPB trades integration for scalability beyond 1A and 36V-making it appropriate only when the original part's limitations are actively constraining the application.
Availability
MP24893DJ-LF-Z is available at Aetrix Electronics and suitable for automotive LED lighting, emergency signage, and low-voltage halogen replacement requiring stable component supply despite its "Not Recommended for New Designs" status.
Supply support for MP24893DJ-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 over 20 years of leadership in DC/DC conversion and LED driver innovation.
The MP2489x product line targets cost-sensitive, space-constrained LED lighting applications requiring wide-input operation and dual dimming modes-prioritizing integration, thermal robustness, and ease of layout over programmability.
FAQ
Is MP24893DJ-LF-Z pin-compatible with MP24895DJ-LF-Z?
No. While both use TSOT23-5 packaging, MP24895DJ-LF-Z features revised pin functions including dedicated thermal pad connection and altered EN/DIM threshold voltages. PCB redesign is required for migration, though schematic-level changes are minimal.
What is the maximum allowable LED string voltage for MP24893DJ-LF-Z?
The maximum LED forward voltage is VIN – VSW(on) – VF(diode), limited by the 36V input rating and internal MOSFET RDS(on) of 0.2Ω. At 1A, this supports up to ~32V LED string (e.g., 9×3.5V white LEDs) with 24V input and Schottky diode drop.
Can MP24893DJ-LF-Z drive multiple parallel LED strings?
No. It regulates current through a single high-side sense resistor and is designed for series-connected LEDs only. Parallel strings require individual current regulation per string to prevent thermal runaway and mismatch.
Why does MP24893DJ-LF-Z specify "Not Recommended for New Designs"?
MPS issued this designation in Rev. 1.02 (Dec 2012) due to the release of MP24895, which improves thermal performance, dimming linearity, and long-term supply assurance. MP24893 remains fully functional but has limited future roadmap support.
What is the minimum recommended input capacitance for MP24893DJ-LF-Z?
A minimum 10µF X5R/X7R ceramic capacitor rated ≥35V is required at the IN pin to suppress high-frequency switching noise and limit surge current into the internal MOSFET. Lower values risk instability and increased EMI.
Does MP24893DJ-LF-Z support synchronization to an external clock?
No. The hysteretic control architecture lacks external clock input or frequency programming capability. Switching frequency varies with input voltage, output load, and inductance-typically 200–600kHz under normal operating conditions.
How is thermal performance affected when using TSOT23-5 versus QFN6 packages?
TSOT23-5 has θJA = 110°C/W and max 1.1W dissipation at 25°C, while QFN6 (3×3mm) achieves θJA = 50°C/W and 2.5W. For 1A operation at 36V input, QFN6 reduces junction temperature rise by ~65°C, enabling higher ambient or longer duty cycles.
MP24893DJ-LF-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:
- Not For New Designs
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MP24893DJ-LF-Z FAQ
1.How can I place an order for MP24893DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP24893DJ-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 MP24893DJ-LF-Z reliable?
The price and inventory of MP24893DJ-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 MP24893DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP24893DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP24893DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP24893DJ-LF-Z?
MP24893DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP24893DJ-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 MP24893DJ-LF-Z?
For technical support, including MP24893DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP24893DJ-LF-Z requirements.
6.How does Aetrix verify that MP24893DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP24893DJ-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 MP24893DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP24893DJ-LF-Z?
All MP24893DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP24893DJ-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 MP24893DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP24893DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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