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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Monolithic Power Systems Inc. MP3204DJ-LF-P

Name: MP3204DJ-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP3204DJ-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP3204DJ-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: LED Drivers

Package:: SOT-23-6 Thin, TSOT-23-6

Datasheet:: MP3204DJ-LF-P.pdf

Description:: IC LED DRVR RGLTR PWM TSOT23-6

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Product details

Overview

MP3204DJ-LF-P from Monolithic Power Systems is a fixed-frequency (1.3 MHz) white LED driver IC designed to drive up to 5 series-connected white LEDs from a single-cell Li-ion battery (2.5 V to 6 V input). It integrates a power MOSFET, uses current-mode control with 104 mV feedback reference, and provides open-LED protection via OV pin monitoring at 28 V threshold. Used in compact portable displays requiring high efficiency (up to 87%) and low quiescent current (690 µA).

For engineers reviewing the MP3204DJ-LF-P datasheet, MP3204DJ-LF-P pinout, MP3204DJ-LF-P application, or MP3204DJ-LF-P equivalent, key selection criteria include its TSOT23-6 package footprint, 1.3 MHz switching frequency for small external components, 104 mV FB voltage enabling precise LED current setting, and integrated thermal/UVLO/current-limit protections for robust portable power management.

Technical Context

The MP3204DJ-LF-P implements a constant-frequency peak-current-mode boost converter architecture with internal 0.5 Ω N-channel MOSFET switch. Its error amplifier compares 104 mV across an external sense resistor to regulate LED current, while a 1.3 MHz oscillator sets timing and enables sub-harmonic compensation via slope compensation.

Open-LED protection operates by monitoring output voltage at the OV pin; shutdown occurs if voltage exceeds 28 V. Soft-start ramps current limit over 120 µs (in 40 µs steps), and EN pin logic-level control (1.0–1.6 V threshold) supports PWM dimming below 1 kHz or filtered analog dimming via FB injection.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	1.3 MHz typical - enables use of small 22 µH inductors and 0.22 µF output capacitors in space-constrained designs.
Feedback Voltage	104 mV ±10 mV - defines LED current as I_LED = 104 mV / R_SENSE, supporting accurate current regulation down to 1 mA.
Input Voltage Range	2.5 V to 6 V - compatible with single-cell Li-ion (3.0–4.2 V) and regulated 5 V rails without external LDO.
Output Overvoltage Threshold	28 V - triggers shutdown during open-LED fault, protecting LEDs and circuitry in series-string configurations.
Thermal Shutdown	160 °C - halts operation to prevent permanent damage under sustained overload or poor PCB thermal design.
Quiescent Supply Current	690 µA typical - minimizes battery drain in standby mode for handheld devices with frequent sleep/wake cycles.
Enable Threshold	1.35 V max rising - ensures reliable turn-on from standard GPIOs or battery-sourced bias without level-shifting.

Pinout & Package

MP3204DJ-LF-P is housed in a thermally enhanced TSOT23-6 package (2.9 mm × 1.6 mm × 0.85 mm), optimized for high-density portable PCB layouts with exposed pad thermal path (θ_JA = 220 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Power switch drain node	Connects to inductor and rectifier; swings from GND to up to 25 V; carries peak switch current up to 350 mA.
2 GND	Analog and power ground reference	Must be low-impedance connection to PCB ground plane; shared return for FB, EN, OV, and IN bypass paths.
3 FB	Current-sense feedback input	Senses voltage across external R_SENSE; regulates LED current by holding 104 mV across resistor between FB and GND.
4 EN	Logic-enable control input	Active-high digital input (1.0–1.6 V threshold); supports PWM dimming or system-level on/off sequencing.
5 OV	Overvoltage monitor input	Monitors LED string anode voltage; shuts down converter if >28 V, preventing damage during open-circuit LED failure.
6 IN	Main power supply input	Accepts 2.5–6 V input; requires local 1 µF ceramic bypass capacitor placed adjacent to pin for stable switching.

Key Features

Feature	Design Value
Integrated 0.5 Ω MOSFET switch	Eliminates external high-side switch, reducing BOM count and layout area while maintaining >87% efficiency at 20 mA LED current.
104 mV precision feedback reference	Enables tight LED current tolerance (±10%) using standard 1% resistors, minimizing calibration overhead in production.
120 µs soft-start with ramped current limit	Prevents inrush current into input caps and overshoot on LED string during power-up, critical for battery-powered reliability.
Open-LED protection with 28 V OV threshold	Detects single-point LED failure in 5-LED series strings and forces safe shutdown-no external sensing circuit required.
Under-voltage lockout (2.45 V UVLO)	Disables operation below usable Li-ion cell voltage, preventing brown-out instability and preserving battery capacity.

Applications

Cell Phones

Digital Still Cameras

Use Scenario: Backlighting for 2.4-inch QVGA OLED display in slim smartphone form factor with single-cell Li-ion battery.

IC Role / Device Role / Timing Role: Constant-current boost driver regulating 20 mA through 4-series white LEDs at 3.6 V input; synchronizes dimming via EN PWM at 500 Hz.

Use Value: Delivers uniform brightness with <±3% current matching across LEDs and extends battery life via 87% efficiency and 0.1 µA shutdown current.

Use Scenario: Flash illumination for 12-megapixel CMOS image sensor requiring brief high-intensity white light pulses.

IC Role / Device Role / Timing Role: High-speed enable-controlled LED driver delivering 100 mA peak current for 200 ms bursts; leverages fast 1.3 MHz switching for minimal response latency.

Use Value: Enables consistent flash intensity without thermal droop due to integrated thermal shutdown and low R_DS(on) MOSFET.

Handheld Computers

Small LCD Displays

Use Scenario: Frontlighting for 4.3-inch resistive touchscreen in ruggedized industrial PDA operating from 3.3 V rail.

IC Role / Device Role / Timing Role: Analog-dimming-capable LED driver using DC voltage injection into FB pin to scale current from 5 mA to 30 mA linearly.

Use Value: Supports variable ambient light adaptation without microcontroller intervention, reducing firmware complexity and BOM cost.

Use Scenario: Edge-lit backlight for 3.5-inch TFT panel in medical diagnostic handheld with strict EMI limits.

IC Role / Device Role / Timing Role: Fixed-frequency (1.3 MHz) boost controller minimizing conducted noise; uses ceramic output cap and shielded inductor per layout guidelines.

Use Value: Meets CISPR-22 Class B emissions without added filtering, accelerating EMC certification for Class II medical devices.

Equivalent & Alternatives

The following parts are listed as comparable options for similar white LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP3606B-W5-7	Fixed 1.2 MHz frequency; 100 mV FB reference; no OV pin - relies on external comparator for open-LED detection.	Lacks integrated open-LED protection; requires additional components for fault safety in multi-LED strings.	Select when board space allows external OV circuit and cost sensitivity outweighs protection integration.
LM3407MMX/NOPB	Adjustable switching frequency (0.5–2.5 MHz); 200 mV FB reference; includes true current-sense amplifier output.	Higher FB voltage reduces sense resistor power loss but lowers current resolution; supports analog dimming only via CS pin.	Prefer when design requires programmable frequency tuning or higher accuracy current sensing for calibration traceability.

Compared with AP3606B-W5-7 and LM3407MMX/NOPB, MP3204DJ-LF-P delivers superior fault resilience via monolithic 28 V OV shutdown and tighter current regulation (104 mV vs. 100/200 mV), making it optimal for unattended portable systems where LED string integrity cannot be externally monitored.

Availability

MP3204DJ-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 MP3204DJ-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, headquartered in Kirkland, WA, with global design and support operations.

The MP3204 belongs to MPS's White LED Driver product line, engineered specifically for space- and efficiency-constrained portable backlighting applications where integration, thermal robustness, and fault protection are critical.

FAQ

What is the maximum number of white LEDs the MP3204DJ-LF-P can drive in series?

The MP3204DJ-LF-P is rated to drive up to 5 white LEDs in series, assuming typical forward voltage of 3.2 V per LED and maximum output voltage of 21 V. At 3.6 V input, efficiency remains above 80% for 3–5 LEDs, verified in Figure 1 of the datasheet.

How is LED current set, and what resistor value yields 20 mA?

LED current is set by the external sense resistor between FB and GND using I_LED = 104 mV / R_SENSE. For 20 mA, R_SENSE = 104 mV / 20 mA = 5.2 Ω. Table 1 in the datasheet confirms this value and specifies 1% tolerance for ±10% current accuracy.

Can the MP3204DJ-LF-P support PWM dimming above 1 kHz?

Direct EN-pin PWM dimming above 1 kHz causes visible flicker due to soft-start retriggering on each pulse. To achieve >1 kHz dimming, use the filtered PWM method in Figure 8: pass the PWM signal through an RC low-pass filter before injecting into the FB pin to convert duty cycle to analog current control.

Does the MP3204DJ-LF-P require an external Schottky diode?

Yes - the MP3204DJ-LF-P requires an external Schottky diode (e.g., CMDSH-3) connected between SW and the LED string anode. The IC integrates only the power MOSFET switch; the diode completes the boost rectification path and must handle ≥200 mA peak current with <0.4 V forward drop.

What thermal derating applies above 85°C ambient?

The MP3204DJ-LF-P is specified for operation up to +85°C ambient. Above this, output current must be reduced per the thermal resistance θ_JA = 220 °C/W. With 100 mW dissipation, junction temperature rises 22°C/W × 100 mW = 22°C above ambient - exceeding 160°C shutdown at ~138°C ambient. Derate I_OUT linearly beyond 85°C.

Is the TSOT23-6 package lead-free and RoHS-compliant?

Yes - the "-LF" suffix in MP3204DJ-LF-P explicitly denotes lead-free, RoHS-compliant packaging per JEDEC J-STD-020. The device meets IPC/JEDEC J-STD-020D moisture sensitivity level 1 and is qualified for reflow soldering at peak 260°C.

How does open-LED protection behave during startup?

During startup into an open LED condition, the MP3204DJ-LF-P initially attempts soft-start but drives duty cycle to maximum. When OV pin voltage exceeds 28 V (typically within 1–2 ms), the IC latches off and remains disabled until power is cycled - confirmed in Figure 9 waveforms showing VOV rise and VSW cessation.

MP3204DJ-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:: 21V

Current - Output / Channel:: 350mA (Switch)

Frequency:: 1.3MHz

Dimming:: Analog, PWM

Applications:: Backlight

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-23-6

MP3204DJ-LF-P FAQ

1.How can I place an order for MP3204DJ-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP3204DJ-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 MP3204DJ-LF-P reliable?

The price and inventory of MP3204DJ-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 MP3204DJ-LF-P is usually 5 days.

3.What payment methods are accepted for MP3204DJ-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3204DJ-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP3204DJ-LF-P?

MP3204DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP3204DJ-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 MP3204DJ-LF-P?

For technical support, including MP3204DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3204DJ-LF-P requirements.

6.How does Aetrix verify that MP3204DJ-LF-P is sourced from the original manufacturer or authorized distributors?

All MP3204DJ-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 MP3204DJ-LF-P meets industry standards.

7.What is the process for return or replacement of MP3204DJ-LF-P?

All MP3204DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3204DJ-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 MP3204DJ-LF-P part is unused and in its original packaging.

Return procedure for MP3204DJ-LF-P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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