My Inquiry
My Account
Monolithic Power Systems Inc. MP1518DJE-LF-P
- Part No.:
- MP1518DJE-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP1518DJE-LF-P.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,436
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP1518DJE-LF-P from Monolithic Power Systems is a fixed-frequency, current-mode boost LED driver IC designed to drive up to 6 series white LEDs from a 2.5V–6V input (e.g., single-cell Li-ion). It features 1.3MHz switching frequency, 104mV feedback voltage, integrated MOSFET, open-load shutdown via OV pin, and thermal/UVLO/current-limit protection. Used in compact portable displays requiring high efficiency (>87%) and low EMI.
For engineers reviewing the MP1518DJE-LF-P datasheet, MP1518DJE-LF-P pinout, MP1518DJE-LF-P application, or MP1518DJE-LF-P equivalent, key selection criteria include its 104mV FB threshold for precision current regulation, TSOT23-6 package footprint, 28V OV shutdown threshold, soft-start timing (120µs), and PWM/DC dimming support-critical for handheld display backlight design.
Technical Context
The MP1518DJE-LF-P implements a constant-frequency peak-current-mode boost architecture with internal 0.5Ω N-channel MOSFET switch and dedicated OV monitoring circuitry. Its 104mV reference enables accurate LED current setting via external sense resistor, while the 1.3MHz oscillator ensures compact magnetics and reduced output ripple.
It integrates soft-start (ramped current limit over 120µs), under-voltage lockout (2.45V turn-on, 92mV hysteresis), and thermal shutdown at 160°C. The slower slew rate vs. MP1518DJ reduces EMI without sacrificing regulation accuracy or protection functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.3 MHz typical - enables use of small 22µH inductors and 0.22µF output capacitors in space-constrained designs. |
| Feedback Voltage | 104 mV ±10 mV - sets LED current as ILED = 104mV / RSENSE; low value minimizes power loss in sense resistor. |
| OV Shutdown Threshold | 28 V - disables switching if output exceeds safe level due to open LED string, preventing overvoltage damage. |
| Input Voltage Range | 2.5 V to 6 V - supports direct operation from single-cell Li-ion (3.0–4.2V) or regulated 3.3/5V rails. |
| Max Duty Cycle | 92% - allows ≥25V output from 2.5V input, sufficient for 6×WLED string (~18–21V forward). |
| Thermal Shutdown | 160 °C - protects die during sustained overload or poor PCB thermal design; auto-recovery after cooldown. |
| Quiescent Current | 750 µA typical - maintains low standby power in battery-powered devices during EN-low sleep mode. |
Pinout & Package
MP1518DJE-LF-P is packaged in a 6-pin TSOT23 (0.95mm × 1.45mm × 0.90mm) with exposed pad not connected internally. Pin 1 is bottom-left when top marking "F6" is read left-to-right.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Power Switch Drain | Internal MOSFET output node; connects to inductor and rectifier; swings 0V to >25V; requires minimized trace area to reduce EMI. |
| 2 (GND) | Ground Reference | Primary return path for power switch, feedback, and enable circuits; must connect to low-impedance ground plane. |
| 3 (FB) | Current Sense Input | Regulates LED current by comparing voltage across external RSENSE to 104mV reference; connect to cathode end of LED string. |
| 4 (EN) | Enable Control | Active-high logic input (1.35V typical threshold); drives internal bias circuits; must not float-tie to VIN if always-on. |
| 5 (OV) | Over-Voltage Monitor | Monitors LED string anode voltage; shuts down converter if >28V detected (e.g., open-circuit failure). |
| 6 (IN) | Input Supply | Power input (2.5–6V); requires local 1µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5Ω Power MOSFET | Eliminates external high-side switch, reducing BOM count and layout complexity in boost LED drivers. |
| 104mV Precision Feedback Reference | Enables accurate LED current control with minimal sense resistor power loss (<1% of total LED power at 20mA). |
| Open-Load Protection via OV Pin | Prevents uncontrolled voltage runaway during LED string failure by disabling switching above 28V output. |
| 120µs Internal Soft-Start | Gradually ramps current limit (3 steps × 40µs) to suppress inrush current and output overshoot at startup. |
| Reduced Slew Rate (DJE variant) | Lower dV/dt on SW node versus standard MP1518DJ, directly lowering conducted and radiated EMI in noise-sensitive applications. |
Applications
| Cell Phones | Digital Still Cameras |
|---|---|
Use Scenario: Backlighting for 2.4″–3.5″ OLED/LCD main displays in slim smartphones with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Constant-current boost driver regulating 15–20mA per LED string (3–6 WLEDs) with PWM dimming synchronized to display frame rate. Use Value: 87% efficiency at 3.6V input extends talk time; 1.3MHz switching avoids AM radio band interference; TSOT23-6 footprint saves board area. | Use Scenario: Flash illumination and LCD viewfinder backlight in compact digital cameras powered by AA/AAA or Li-ion packs. IC Role / Device Role / Timing Role: High-efficiency current source delivering stable 20mA to 4-series WLED flash array, with analog dimming for adjustable brightness. Use Value: 104mV FB reference enables tight current matching across LEDs; OV protection prevents damage if flash LED fails open during burst mode. |
| Handheld Computers | Small LCD Displays |
Use Scenario: Backlight for 4.3″–7″ resistive/touch LCD panels in industrial PDAs or medical handhelds operating from 3.3V or 5V rails. IC Role / Device Role / Timing Role: Fixed-frequency boost controller driving 6-series WLEDs with EN-based on/off control and thermal foldback during extended operation. Use Value: UVLO (2.45V) prevents brownout operation below battery cutoff; 160°C thermal shutdown safeguards against enclosure overheating. | Use Scenario: Edge-lit backlight for 1.8″–3.0″ monochrome or color TFT modules in test equipment, POS terminals, and IoT displays. IC Role / Device Role / Timing Role: Low-EMI LED driver using DJE variant's slower slew rate to meet Class B EMC requirements without added filtering. Use Value: Reduced EMI simplifies compliance testing; TSOT23-6 package allows placement near display flex connector, minimizing trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1518DG-LF-Z | 8-pin QFN (2mm × 2mm) package; higher thermal dissipation (θJA = 80°C/W); identical electrical specs. | Better suited for higher-current or continuous-duty applications where PCB copper area is limited. | Select DG for thermally demanding layouts or when needing extra pins for optional features (e.g., NC pin for future routing). |
| RT9397BZSP | Fixed 1.2MHz frequency; 100mV FB; no OV pin; requires external MOSFET; lower max output voltage (20V). | Lacks open-load protection and integrated switch; needs more external components and board space. | Choose only if cost sensitivity outweighs reliability requirements and board area is unconstrained. |
Compared with MP1518DG-LF-Z, the MP1518DJE-LF-P offers identical regulation performance in a smaller footprint but lower thermal capacity; versus RT9397BZSP, it delivers higher integration, built-in protection, and superior fault resilience at the cost of slightly higher unit price.
Availability
MP1518DJE-LF-P is available at Aetrix Electronics and suitable for cell phones, digital still cameras, and handheld computers requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP1518DJE-LF-P 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.
The MP1518 product line targets portable backlighting applications, delivering highly integrated, efficient, and EMI-optimized LED drivers for space- and battery-constrained consumer electronics.
FAQ
What is the purpose of the OV pin on MP1518DJE-LF-P?
The OV (Over-Voltage) pin monitors the LED string anode voltage. When it exceeds 28V-indicating an open-circuit condition such as a failed LED-the IC disables switching and holds shutdown until power is cycled. This prevents uncontrolled voltage rise and potential damage to downstream components.
Can MP1518DJE-LF-P drive more than 6 white LEDs?
No. The device is rated for up to 6 series white LEDs, assuming typical forward voltage of 3.0–3.5V each (18–21V total). With maximum output voltage limited to 25V and duty cycle capped at 92%, exceeding 6 LEDs risks regulation loss or OV-triggered shutdown under nominal input conditions.
How does the DJE suffix differ from standard MP1518DJ?
The "DJE" variant features a deliberately reduced switching node slew rate compared to MP1518DJ, lowering high-frequency EMI emissions without altering regulation accuracy, protection thresholds, or pinout. It is recommended where EMC compliance is critical and board-level filtering is impractical.
What is the minimum recommended input capacitance for MP1518DJE-LF-P?
A 1µF X5R/X7R ceramic capacitor placed as close as possible to the IN and GND pins is required. This stabilizes input voltage during high di/dt switching events and prevents instability or audible noise caused by insufficient local energy storage.
Does MP1518DJE-LF-P support analog dimming?
Yes. Analog dimming is implemented by injecting current into the FB pin via a resistor divider from a DC control voltage. As external current flows into FB, the internal error amplifier reduces LED current to maintain 104mV across RSENSE, enabling smooth 0–100% brightness control without PWM artifacts.
Is thermal derating required for TSOT23-6 operation at 125°C ambient?
Yes. With θJA = 220°C/W, the maximum allowable power dissipation at 125°C ambient is only ~0.12W (calculated as (125°C − 125°C)/220 = 0W, but practical limit is set by junction temperature margin). Derate output current or add copper pour to maintain TJ ≤ 125°C under full load.
What happens during startup when EN is asserted?
Upon EN rising above 1.35V, the IC initiates 120µs soft-start: current limit increases in three 40µs steps (0 → 1/4 → 2/4 → 3/4 → full), limiting inrush current and controlling output voltage ramp rate to prevent overshoot and stress on LEDs and output capacitor.
MP1518DJE-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 6V
- Voltage - Output:
- 25V
- Current - Output / Channel:
- 350mA (Switch)
- Frequency:
- 1.3MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MP1518DJE-LF-P FAQ
1.How can I place an order for MP1518DJE-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1518DJE-LF-P 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 MP1518DJE-LF-P reliable?
The price and inventory of MP1518DJE-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1518DJE-LF-P is usually 5 days.
3.What payment methods are accepted for MP1518DJE-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1518DJE-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1518DJE-LF-P?
MP1518DJE-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1518DJE-LF-P 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 MP1518DJE-LF-P?
For technical support, including MP1518DJE-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1518DJE-LF-P requirements.
6.How does Aetrix verify that MP1518DJE-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1518DJE-LF-P 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 MP1518DJE-LF-P meets industry standards.
7.What is the process for return or replacement of MP1518DJE-LF-P?
All MP1518DJE-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1518DJE-LF-P, 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 MP1518DJE-LF-P part is unused and in its original packaging.
Return procedure for MP1518DJE-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP1518DJE-LF-P Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
