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Monolithic Power Systems Inc. MP3302DJ-LF-Z
- Part No.:
- MP3302DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP3302DJ-LF-Z.pdf
- Description:
- IC LED DRV RGLTR SGL WR TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,385
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Product details
Overview
MP3302DJ-LF-Z from Monolithic Power Systems is a 40V, 1.3A single-cell step-up white LED driver with fixed-frequency current-mode control, 200mV feedback voltage, and single-wire analog/PWM dimming. It integrates a 0.5Ω internal MOSFET switch and regulates LED current via external sense resistor for up to 10-series WLED strings in handheld LCD backlighting.
For engineers reviewing the MP3302DJ-LF-Z datasheet, MP3302DJ-LF-Z pinout, MP3302DJ-LF-Z application, or MP3302DJ-LF-Z equivalent, key selection criteria include its 1.3MHz switching frequency, open-load shutdown at 42V, thermal shutdown at 150°C, UVLO (2.45V rising), and compatibility with TSOT23-5 footprint for space-constrained portable designs.
Technical Context
The MP3302DJ-LF-Z implements a constant-frequency peak-current-mode boost converter architecture with internal ramp compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier compares FB voltage against a trimmed 200mV reference to regulate LED current.
Dimming is implemented through EN pin: DC voltage (0.7–1.4V) enables analog dimming by scaling FB reference linearly from 0–200mV; PWM signals (200Hz–1kHz, ≥1.5V amplitude) provide digital brightness control. Open-circuit protection disables SW when VOUT exceeds 42V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports single Li-ion battery operation without overvoltage stress on internal circuitry |
| Switching Frequency | 1.3MHz (typ) - enables use of small 4.7µH inductors and 0.47µF output capacitors in compact layouts |
| Feedback Voltage | 200mV (typ) - reduces I²R loss across sense resistor, improving efficiency at high LED currents |
| SW Pin Max Voltage | 36V - defines maximum achievable LED string voltage (e.g., 10×3.3V WLEDs = 33V) |
| Thermal Shutdown | 150°C - protects die during sustained overload or poor PCB thermal design |
| UVLO Threshold | 2.45V (rising) - prevents erratic startup below usable battery voltage, ensuring stable regulation |
| Open-Load Shutdown | 42V (rising) - disables switching if LED string opens, preventing uncontrolled voltage rise and capacitor overstress |
Pinout & Package
MP3302DJ-LF-Z is packaged in a 5-pin TSOT23-5 with exposed pad connected to GND for thermal dissipation. The package measures 2.9mm × 1.6mm × 0.85mm and is RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SW | Drain of internal 0.5Ω MOSFET - connects to inductor and rectifier; swings from GND to ≤36V |
| 2 | GND | Power and signal ground - must be tied to exposed pad for thermal performance and noise immunity |
| 3 | FB | Current-sense feedback input - regulates LED current by holding voltage across RSENSE at 200mV |
| 4 | EN | Enable/dimming control - logic-level ON/OFF and analog/PWM dimming interface (0.4V/0.6V thresholds) |
| 5 | IN | Input supply pin - requires local 10µF ceramic bypass capacitor to minimize high-frequency ripple |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.3A MOSFET switch | Eliminates external high-side switch, reducing BOM count and layout area in portable backlight systems |
| Single-wire dimming interface | EN pin supports both analog (0.7–1.4V DC) and PWM (200Hz–1kHz) dimming without additional control lines |
| 200mV precision feedback reference | Enables use of low-value, low-power sense resistors (e.g., 1.11Ω for 180mA), minimizing board heat generation |
| Open-load and thermal protection | Automatically disables SW output on LED string failure or junction overheating, preventing system damage |
| 1.3MHz fixed-frequency operation | Allows full utilization of small, low-DCR inductors and ceramic capacitors, critical for thin handheld form factors |
Applications
| Handheld LCD Backlighting | Digital Still Camera Display |
|---|---|
Use Scenario: Driving 9 parallel strings of 3-series white LEDs (27 total) from a 3.3–6V Li-ion battery in a 5" LCD panel. IC Role / Device Role / Timing Role: Step-up LED current regulator with integrated power switch and single-wire dimming control. Use Value: Delivers stable 180mA total current with >85% efficiency at 5V input, enabling >5-hour battery life in PDA-class devices. | Use Scenario: Backlighting a 3.5" OLED viewfinder in a compact digital still camera requiring flicker-free dimming during video capture. IC Role / Device Role / Timing Role: Constant-current LED driver supporting 200Hz–1kHz PWM dimming via EN pin for seamless brightness transitions. Use Value: Achieves 100:1 dimming ratio with <1% current ripple, eliminating visible frame-rate artifacts in live preview mode. |
| Small Industrial HMI Display | Portable Medical Device Indicator |
Use Scenario: Powering a 7-segment + icon LED array (10 LEDs in series) in a ruggedized industrial handheld terminal operating from 3.6V primary cell. IC Role / Device Role / Timing Role: High-voltage boost controller delivering up to 33V output while maintaining ±3% LED current accuracy. Use Value: Sustains full brightness across 2.5–6V input range with automatic UVLO shutdown below 2.45V, preventing brown-out display corruption. | Use Scenario: Driving dual-color (white/red) status indicators in a battery-powered ECG monitor requiring Class II medical safety compliance. IC Role / Device Role / Timing Role: Isolated current source with open-load detection - disables output immediately upon LED disconnection to prevent fault propagation. Use Value: Meets IEC 60601-1 creepage/clearance requirements via TSOT23-5 footprint and 42V OVP clamping, eliminating need for external protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT9397BZSP | Fixed 1.2MHz frequency, 1.2A switch, 200mV FB, but no integrated soft-start or open-load shutdown | Lacks open-circuit protection - requires external OVP circuit for fail-safe LED string monitoring | Prefer MP3302DJ-LF-Z where automatic open-load response is required in unattended devices |
| TPS61165DRVR | 1.2MHz, 1.2A switch, 200mV FB, supports I²C dimming but no analog EN dimming | Requires I²C host controller; incompatible with simple GPIO-based dimming schemes | Choose MP3302DJ-LF-Z for minimal MCU pin count and direct analog/PWM control without protocol overhead |
Compared with RT9397BZSP and TPS61165DRVR, MP3302DJ-LF-Z uniquely combines single-wire analog/PWM dimming, open-load shutdown, and integrated soft-start in TSOT23-5 - simplifying design for cost-sensitive, space-constrained portable displays without sacrificing protection or control flexibility.
Availability
MP3302DJ-LF-Z is available at Aetrix Electronics and suitable for handheld LCD backlighting, digital camera displays, small industrial HMIs, and portable medical indicator lighting requiring stable component supply across extended production lifecycles.
Supply support for MP3302DJ-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 MP3302 belongs to MPS's white LED driver product line, engineered specifically for efficient, compact, and reliable backlighting of small-to-midsize LCDs in battery-powered portable electronics.
FAQ
What is the maximum number of white LEDs the MP3302DJ-LF-Z can drive in series?
The MP3302DJ-LF-Z supports up to 10 white LEDs in series, assuming typical forward voltage of 3.3V per LED (33V total), staying within its 36V SW pin rating and 42V open-load shutdown threshold. Driving more than 10 LEDs risks exceeding safe operating voltage limits and triggering protection shutdown.
Does the MP3302DJ-LF-Z require an external Schottky diode?
Yes - the MP3302DJ-LF-Z requires an external Schottky diode (e.g., B0540) connected between SW and the LED string anode. The internal MOSFET serves only as the high-side switch; the diode provides the return path for inductor current during off-time, enabling boost topology operation.
How is LED current set, and what tolerance applies to the 200mV feedback voltage?
LED current is set by ILED = 200mV / RSENSE, using a precision resistor from FB to GND. The feedback voltage is specified as 185–215mV (±15mV) over temperature and process, yielding ±7.5% current accuracy before considering resistor tolerance and layout parasitics.
Can the MP3302DJ-LF-Z operate from a 3.3V input while driving 9 strings of 3-series LEDs?
Yes - the MP3302DJ-LF-Z operates from 2.5V to 6V input. With 9 parallel strings of 3×3.3V WLEDs (≈10V string voltage), the boost converter delivers ~180mA total current at >80% efficiency from 3.3V input, as verified in Figure 2 of the datasheet under "Typical Application."
What thermal derating applies to the TSOT23-5 package at 85°C ambient?
With θJA = 220°C/W and TJ(MAX) = 125°C, maximum continuous power dissipation at TA = 85°C is (125 − 85)/220 ≈ 0.18W. At typical 87% efficiency and 180mA LED load, power dissipation remains ~0.12W - within safe margin without forced airflow or copper pour enhancement.
Is the EN pin compatible with 1.8V or 3.3V GPIO control without level shifting?
Yes - the EN pin has guaranteed turn-on at ≥0.6V and turn-off at ≤0.4V, making it directly compatible with 1.8V and 3.3V CMOS GPIO outputs. For analog dimming, ensure the driving DAC or resistor divider provides clean 0.7–1.4V with local 100nF bypassing to avoid noise-induced current instability.
MP3302DJ-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:
- 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:
- 36V
- Current - Output / Channel:
- 1.33A (Switch)
- Frequency:
- 1.3MHz
- Dimming:
- Single-Wire
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MP3302DJ-LF-Z FAQ
1.How can I place an order for MP3302DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3302DJ-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 MP3302DJ-LF-Z reliable?
The price and inventory of MP3302DJ-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 MP3302DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3302DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3302DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3302DJ-LF-Z?
MP3302DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3302DJ-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 MP3302DJ-LF-Z?
For technical support, including MP3302DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3302DJ-LF-Z requirements.
6.How does Aetrix verify that MP3302DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3302DJ-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 MP3302DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3302DJ-LF-Z?
All MP3302DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3302DJ-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 MP3302DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP3302DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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