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Monolithic Power Systems Inc. MP3412EJ-LF-Z
- Part No.:
- MP3412EJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP3412EJ-LF-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,829
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Product details
Overview
MP3412EJ-LF-Z from Monolithic Power Systems is a synchronous boost WLED driver IC with true output disconnect, 1.1A switch current limit, 1MHz fixed switching frequency, and 0.8V minimum startup voltage. It operates from 0.8V–4.4V input to deliver regulated 2.5V–5.0V output for white LED biasing in space-constrained portable devices.
For engineers reviewing the MP3412EJ-LF-Z datasheet, MP3412EJ-LF-Z pinout, MP3412EJ-LF-Z application, or MP3412EJ-LF-Z equivalent, key selection criteria include its TSOT23-6 package footprint, integrated NMOS/PMOS switches, 200mV feedback reference, <1µA shutdown current, and inrush-limited soft-start for battery-powered LED systems.
Technical Context
The MP3412EJ-LF-Z implements current-mode PWM control with internal slope compensation and transconductance error amplifier (33 µS), regulating LED current via a 200mV FB reference and external RSENSE. Its start-up oscillator (250kHz, 70% duty) enables operation below 1V before transitioning to closed-loop 1MHz operation once VOUT exceeds 2.3V.
True output disconnect is achieved by eliminating body-diode conduction in the internal PMOS synchronous rectifier, fully discharging VOUT during shutdown and limiting inrush current at startup. Protection includes open-load shutdown (SW > 5.1V), thermal regulation (125°C onset), and hard thermal shutdown (150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8V to 4.4V - supports single-cell alkaline, NiMH, or Li-ion batteries down to near-dead state. |
| Output Voltage Range | 2.5V to 5.0V - matches forward voltage of 1–2串联 white LEDs (3.0–3.6V typical per LED). |
| Switch Current Limit | 1.1A - sets maximum inductor peak current, enabling ≥200mA LED drive with margin. |
| Feedback Reference | 200mV ±5mV - defines LED current as ILED = 0.2V / RSENSE, enabling precise current setting. |
| Shutdown Current | <1µA - minimizes battery drain in standby, critical for always-on portable displays. |
| Switching Frequency | 1.0MHz ±10% - allows use of ≤10µH low-profile inductors and ceramic capacitors for compact layout. |
| Efficiency | Up to 96% - achieved via integrated 336mΩ NMOS and 405mΩ PMOS switches, reducing conduction loss. |
Pinout & Package
MP3412EJ-LF-Z is housed in a 6-pin TSOT23-6 package (0.95mm × 1.60mm × 0.60mm, 0.5mm pitch), optimized for ultra-thin portable PCBs. Pin functions are validated per Monolithic Power Systems Rev. 1.0 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power Switch Node | Connection point of internal NMOS and PMOS switches; ties directly to inductor; carries high di/dt switching current. |
| 2 GND | Power & Signal Ground | Common return path for power switches, error amplifier, and enable logic; must be low-impedance local plane. |
| 3 FB | Current Sense Feedback Input | Monitors voltage across RSENSE; compared to 200mV reference to regulate LED current; high-impedance node. |
| 4 EN | Enable Control Input | Logic-level input (0.4V low / 0.62V high thresholds); enables PWM dimming when driven with 200Hz square wave. |
| 5 OUT | Boost Output / Rectifier Drain | Drain of internal PMOS synchronous rectifier; connects to LED anode; fully disconnected from IN during shutdown. |
| 6 IN | Battery Supply Input | Primary power input; internally powers gate drivers and control circuitry; requires local 4.7–10µF ceramic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Load Disconnect | VOUT fully discharges to 0V during shutdown, eliminating residual LED glow and preventing reverse current leakage. |
| Inrush Current Limiting & Soft-Start | Internal 200µs soft-start ramps peak switch current from 300mA to 1.1A, suppressing input surge and output overshoot. |
| Integrated Power MOSFETs | 336mΩ NMOS switch + 405mΩ PMOS synchronous rectifier eliminate external FETs and reduce BOM count and footprint. |
| Open-Load & Short-Circuit Protection | Detects open LED (SW > 5.1V) and shorted output via dynamic current limit reduction and thermal regulation, preventing damage. |
| Low-Voltage Start-Up | Independent 250kHz start-up oscillator enables operation from 0.8V input, extending usable battery life in deep-discharge conditions. |
Applications
| Cellular Phone Display Backlight | Digital Camera Flash/Indicator |
|---|---|
|
Use Scenario: Driving 1–2 white LEDs for main display backlight in GSM/UMTS smartphones with single-cell Li-ion battery (2.8–4.2V). IC Role / Device Role / Timing Role: Synchronous boost converter providing constant-current LED bias; regulates current via FB pin and RSENSE with 1MHz switching. Use Value: Enables full brightness at low battery voltage (≤3.0V) while maintaining <1µA shutdown current to extend standby time. |
Use Scenario: Providing controlled flash illumination or status indicator in compact digital cameras powered by AA/AAA batteries. IC Role / Device Role / Timing Role: High-efficiency WLED driver with PWM dimming support via EN pin; delivers stable 200mA current regardless of input sag. Use Value: Delivers consistent LED intensity across 0.8–4.4V input range, eliminating need for separate LDO or charge-pump solutions. |
| Handheld Instrument LCD Backlight | GPS Receiver Status Indicator |
|
Use Scenario: Illuminating monochrome or color LCDs in rugged handheld test equipment operating from primary alkaline cells. IC Role / Device Role / Timing Role: Step-up regulator with true output disconnect ensures zero LED leakage current during instrument sleep mode. Use Value: Prevents unintended LED glow during low-power states, improving user interface clarity and conserving battery energy. |
Use Scenario: Driving small status LEDs in automotive-grade GPS receivers requiring wide temperature (-40°C to +125°C) operation. IC Role / Device Role / Timing Role: WLED driver with integrated thermal shutdown (150°C) and overvoltage protection (5.1V) for robust field reliability. Use Value: Maintains LED visibility under extreme ambient conditions without external protection components or thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT9397BZSP | Fixed 1.2MHz frequency; 1.2A switch limit; no true output disconnect; 1.2µA shutdown current. | Lacks output discharge capability - unsuitable where zero LED leakage in shutdown is required. | Select when higher switching frequency is preferred and output disconnect is not needed. |
| TPS61061DRVR | 1.2MHz frequency; 1.2A limit; 200mV FB reference; 0.1µA shutdown; but uses SOT23-6 with different pinout (no dedicated SW pin). | Non-compatible pinout requires PCB redesign; lacks open-load protection threshold specification. | Choose only if board layout allows re-routing and open-load fault detection is handled externally. |
Compared with RT9397BZSP and TPS61061DRVR, MP3412EJ-LF-Z uniquely combines true output disconnect, 0.8V startup, and validated open-load protection in TSOT23-6 - making it optimal for battery-critical portable LED systems demanding zero standby leakage and deep-input operation.
Availability
MP3412EJ-LF-Z is available at Aetrix Electronics and suitable for cellular phone display backlighting, handheld instrument LCD illumination, and GPS receiver status indicators requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP3412EJ-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 design centers in the US, China, and Taiwan.
The MP34xx series targets portable LED lighting applications, delivering high-efficiency, ultra-low-voltage boost conversion with integrated protection and minimal external components for space-constrained designs.
FAQ
What is the minimum input voltage required for MP3412EJ-LF-Z to start switching?
The MP3412EJ-LF-Z starts operation at 0.8V typical (0.62V min, 0.82V max) due to its dedicated low-voltage start-up oscillator. Below this threshold, the device remains inactive. Once started, it sustains regulation even if VIN drops to 0.5V, as bias shifts to VOUT after startup completion.
How is LED current set, and what RSENSE value yields 200mA?
LED current is set by ILED = 0.2V / RSENSE, using the internal 200mV feedback reference. For 200mA, RSENSE = 0.2V / 0.2A = 1.0Ω. The datasheet confirms this value achieves ~200mA under standard test conditions (VIN=1.8V, one WLED).
Does MP3412EJ-LF-Z support PWM dimming, and how is it implemented?
Yes - PWM dimming is implemented by applying a 200Hz square wave to the EN pin. The EN pin has defined logic thresholds (0.4V low, 0.62V high), and the minimum recommended amplitude is 0.8V. Dimming ratio is proportional to EN duty cycle, with full brightness at 100% EN high time.
What protection features prevent damage during LED open-circuit failure?
Open-load protection triggers when FB remains at 0V (LED open), causing uncontrolled duty cycle increase. When SW voltage exceeds 5.1V, the device shuts down completely and remains latched off until power is cycled - preventing overvoltage stress on external components and the IC itself.
Can MP3412EJ-LF-Z operate with input voltage higher than output voltage?
Yes - it maintains current regulation even when VIN > VOUT, but the PMOS synchronous rectifier ceases low-impedance operation, increasing power dissipation. Efficiency drops significantly in this mode, so maximum LED current must be reduced to avoid exceeding 125°C thermal regulation or 150°C shutdown.
Is the TSOT23-6 package thermally adequate for 1.1A switching current?
Yes - the TSOT23-6 package has θJA = 220°C/W (4-layer PCB). At 1.1A load and 96% efficiency, power dissipation is ~45mW, resulting in ~10°C junction rise above ambient - well within the -40°C to +125°C operating range and 150°C absolute max.
What capacitor values are recommended for stable operation?
Recommended values: 4.7–10µF X5R/X7R ceramic for CIN (local bypass at IN pin); 2.2µF X7R ceramic for COUT (output filtering and loop stability); and RSENSE placed close to FB/GND with short traces to minimize noise coupling.
MP3412EJ-LF-Z 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):
- 0.8V
- Voltage - Supply (Max):
- 4.4V
- Voltage - Output:
- 2.5V ~ 5V
- Current - Output / Channel:
- 1.1A (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -20°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MP3412EJ-LF-Z FAQ
1.How can I place an order for MP3412EJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3412EJ-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 MP3412EJ-LF-Z reliable?
The price and inventory of MP3412EJ-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 MP3412EJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3412EJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3412EJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3412EJ-LF-Z?
MP3412EJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3412EJ-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 MP3412EJ-LF-Z?
For technical support, including MP3412EJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3412EJ-LF-Z requirements.
6.How does Aetrix verify that MP3412EJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3412EJ-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 MP3412EJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3412EJ-LF-Z?
All MP3412EJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3412EJ-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 MP3412EJ-LF-Z part is unused and in its original packaging.
Return procedure for MP3412EJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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