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

Monolithic Power Systems Inc. MP3306EG-LF-Z

Name: MP3306EG-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP3306EG-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP3306EG-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: LED Drivers

Package:: 12-TFQFN

Datasheet:: MP3306EG-LF-Z.pdf

Description:: IC LED DRVR RGLTR PWM 1.8A 12QFN

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Product details

Overview

MP3306EG-LF-Z from Monolithic Power Systems is a synchronous step-up white LED driver IC with 3V–12V input, 700kHz fixed-frequency current-mode control, and 202mV ±3% feedback reference. It regulates LED current via external high-side sense resistor, supports analog/PWM dimming, and integrates open-load shutdown, output disconnect, and thermal/short-circuit protection. Used in compact portable displays driving up to 8-series white LEDs at 20mA.

For engineers reviewing the MP3306EG-LF-Z datasheet, MP3306EG-LF-Z pinout, MP3306EG-LF-Z application, or MP3306EG-LF-Z equivalent, key selection factors include its low 202mV FB voltage for minimal sense loss, QFN12 (2mm × 2mm) thermal performance (θJA = 80°C/W), programmable OVP threshold, and dual-dimming interface (PWMI/PWMO) enabling flexible brightness control in space-constrained designs.

Technical Context

The MP3306EG-LF-Z implements a constant-frequency peak-current-mode boost architecture with internal ramp compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier compares 202mV FB voltage against sensed current, while PWM comparator modulates the low-side NMOS switch (RNL-ON = 0.6Ω) and high-side NMOS (RNH-ON = 0.6Ω) in synchronous rectification.

Protection logic includes cycle-by-cycle current limiting (1.8A), latch-off OVP triggered at 1.22V on OVP pin, UVLO (2.7V rising), thermal shutdown (150°C), and output disconnect via internal NMOS (RND-ON = 0.5Ω) during EN = low. Dimming is implemented either by filtering PWMI (0.1–50kHz) through internal 100kΩ + external capacitor to PWMO (0–1.2V DC), or direct PWM injection with PWMO floating.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3V to 12V - Supports single-cell Li-ion (3.0–4.2V) and multi-cell alkaline/NiMH (up to 12V) without external LDO pre-regulation.
Switching Frequency	550–830kHz (typ. 700kHz) - Enables use of small 15µH inductors and <1µF ceramic output caps while maintaining EMI control.
Feedback Reference	202mV ±3% - Minimizes power loss across current-sense resistor; enables 10Ω R_SET for 20mA LED current (I_LED = 0.202V / R_SET).
Output Disconnect R_ON	0.5Ω - Ensures full discharge of output cap during shutdown, eliminating residual LED glow in portable devices.
OVP Threshold Accuracy	1.18–1.26V - Programmable open-load protection via external resistor divider; latches off until EN toggle.
Thermal Shutdown	150°C - Internal OTP prevents permanent damage under sustained overload or poor PCB heatsinking.
Quiescent Current	300–460µA - Low operating bias enables >100hr standby in battery-powered cameras and PDAs.

Pinout & Package

MP3306EG-LF-Z is housed in a thermally enhanced 12-pin QFN package (2mm × 2mm, 0.4mm pitch) with exposed thermal pad. The package supports high-power density layout and achieves θJA = 80°C/W on 4-layer PCB per JESD51-7.

Pin/Terminal	Circuit Role	Design Meaning
1 IN	Input supply rail	Bypassed locally to GND; powers internal logic and gate drivers; accepts 3–12V unregulated input.
2 VCC	Internal LDO output	3.9V regulated supply for gate drivers and control circuitry; requires 1µF ceramic bypass to GND.
3 EN	Enable control input	Logic-level enable: <0.6V = OFF, >1.1V = ON; supports direct MCU GPIO control.
4 PWMI	PWM dimming input	Accepts 0.1–50kHz PWM signal; internally filtered to generate analog dimming voltage at PWMO.
5 PWMO	Analog dimming output	0–1.2V filtered output controlling FB reference; connect external cap for analog dimming; float for pure PWM mode.
6 OVP	Programmable over-voltage sense	Voltage divider sets OVP threshold (1.22V internal reference); triggers latch-off on open LED string.
7 FB	Current-sense feedback input	Compares voltage across external R_SENSE; regulates LED current to 202mV / R_SENSE.
8 GND	Power and signal ground	Common return for all circuits; must be low-impedance connection to thermal pad.
9 SW	Switch node	Drain of internal low-side NMOS; connects to inductor; carries high di/dt switching current.
10 OUT	Boost output terminal	Connects to LED anode and output capacitor; requires short, low-ESR ceramic cap (0.22–2.2µF).
11 BST	Bootstrap supply	Forms floating gate drive for high-side NMOS via SW–BST capacitor (typically 0.1µF).
12 L	Inductor connection	Source of internal disconnect MOSFET; connects to inductor; enables input–output isolation in shutdown.

Key Features

Feature	Design Value
Synchronous rectification	Reduces conduction loss via integrated 0.6Ω high-side and 0.6Ω low-side NMOS switches - improves efficiency >90% at 20mA/8-LED load.
Programmable open-load shutdown	External resistor divider on OVP pin sets precise overvoltage threshold (e.g., 24V for 8×3V LEDs); prevents runaway output during LED failure.
Dual dimming interface	Single IC supports both analog (via PWMO voltage) and PWM (via PWMI) dimming - eliminates need for external dimming controller or DAC.
Output-to-input disconnect	Internal 0.5Ω NMOS isolates OUT from IN during shutdown - ensures zero leakage current and full output capacitor discharge.
Low 202mV feedback voltage	Minimizes I²R loss in current-sense resistor - enables 10Ω R_SET for 20mA, reducing heat and board area vs. 100mV+ competitors.

Applications

Smartphone Backlight

Digital Still Camera Flash

Use Scenario: Driving 6–8 white LEDs in series for LCD backlight in sub-6-inch smartphones with Li-ion battery input (3.3–4.2V).

IC Role / Device Role / Timing Role: Constant-current boost controller regulating 20mA per string; provides PWM dimming synchronized to display frame rate.

Use Value: 202mV FB reference and QFN12 package enable <1.5mm² solution size; output disconnect eliminates ghost illumination during screen-off state.

Use Scenario: High-brightness flash for 1/2.3″ or 1″ sensor cameras requiring short-duration (10–100ms), high-current (350mA) LED pulses.

IC Role / Device Role / Timing Role: Boost converter with fast-enabling EN pin and cycle-by-cycle current limit; delivers controlled current pulse without thermal runaway.

Use Value: 1.8A current limit and thermal shutdown protect against overdrive; 700kHz switching allows compact inductor (<2.5mm height) in tight camera module space.

Portable Media Player Display

Industrial Handheld Terminal

Use Scenario: Driving 4–6 white LEDs for 3–5″ TFT display in battery-powered media players with variable input (3–12V alkaline/NiMH).

IC Role / Device Role / Timing Role: Input-flexible LED driver supporting analog dimming via PWM-filtered PWMO for smooth brightness control across battery discharge curve.

Use Value: UVLO (2.7V) and wide VIN ensure operation down to near-dead battery; low quiescent current extends playback time between charges.

Use Scenario: Ruggedized handheld terminals used in warehouses or field service with wide ambient temperature (-40°C to +85°C) and intermittent power.

IC Role / Device Role / Timing Role: Reliable LED driver with -40°C to +125°C junction rating, latch-off OVP, and short-circuit protection for harsh industrial environments.

Use Value: Thermal shutdown (150°C) and robust package (QFN12 with exposed pad) maintain operation under sealed enclosures with limited airflow.

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
RT9397BZSP	Fixed 1.2MHz switching frequency; 200mV FB; no integrated OVP programming - requires external comparator.	Lacks programmable OVP and output disconnect; suitable only where open-LED fault tolerance is handled externally.	Select when higher f_SW enables smaller magnetics but system-level OVP is already implemented.
TPS61165DRVR	2.2MHz f_SW; 200mV FB; integrated 1.2V LDO for bias; no PWMO analog dimming path - PWM-only dimming.	Higher frequency reduces inductor size but increases switching loss; lacks analog dimming flexibility and output disconnect.	Choose for ultra-compact layouts where PWM dimming suffices and external LDO simplifies bias design.

Compared with RT9397BZSP and TPS61165DRVR, the MP3306EG-LF-Z uniquely combines programmable OVP, output disconnect, and dual-mode dimming in a 2mm × 2mm QFN - delivering superior fault resilience and design flexibility for portable LED systems without increasing BOM count.

Availability

MP3306EG-LF-Z is available at Aetrix Electronics and suitable for smartphone backlighting, digital camera flash modules, and portable media player displays requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP3306EG-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 focus on energy-efficient DC/DC conversion, LED drivers, and motor control solutions.

The MP3306 belongs to MPS's white LED boost driver product line, engineered specifically for space-constrained portable electronics requiring high efficiency, dual dimming modes, and robust fault protection across wide input voltage ranges.

FAQ

What is the maximum number of white LEDs the MP3306EG-LF-Z can drive in series?

The MP3306EG-LF-Z can drive up to 8 white LEDs in series when supplied from 5V input, assuming typical 3V forward voltage per LED (24V total). Its 30V absolute maximum output rating and 93% max duty cycle support this configuration with margin. Output voltage is limited by OVP programming and thermal constraints - actual count depends on V_F variation, ambient temperature, and PCB thermal design.

How does the MP3306EG-LF-Z implement analog dimming without an external DAC?

The MP3306EG-LF-Z uses an internal 100kΩ resistor between PWMI and PWMO pins. When a PWM signal is applied to PWMI and a capacitor is placed from PWMO to GND, the RC filter converts PWM duty cycle into a linear 0–1.2V DC voltage at PWMO. This voltage directly scales the internal 202mV reference, enabling true analog dimming with only one external capacitor - no DAC or op-amp required.

Can the MP3306EG-LF-Z operate with input voltages below 3V?

No. The MP3306EG-LF-Z has a guaranteed operating input range of 3V to 12V, with UVLO triggering at 2.7V (rising) and releasing hysteresis at 2.57V. Below 3V, the internal LDO cannot sustain VCC regulation, gate drivers lose drive strength, and current regulation becomes unstable. For sub-3V battery applications, consider buck-boost or SEPIC alternatives.

What is the purpose of the L pin, and how does it differ from IN?

The L pin is the source terminal of the internal disconnect MOSFET and connects directly to the inductor. Unlike IN (which supplies power to internal logic and gate drivers), L carries switched input current and enables output-to-input isolation during shutdown. When EN = low, the L–OUT path is opened via the 0.5Ω R_ND-ON MOSFET, fully discharging the output capacitor - a feature not available on standard boost controllers.

Is the MP3306EG-LF-Z compatible with ceramic output capacitors only?

Yes. The MP3306EG-LF-Z requires low-ESR ceramic output capacitors (0.22–2.2µF) placed as close as possible to the OUT and GND pins. Its control loop is optimized for ceramic capacitance and ESR characteristics; aluminum or tantalum capacitors introduce phase shift and instability, potentially causing oscillation or poor transient response in LED current regulation.

How is over-voltage protection programmed, and what happens after shutdown?

OVP is programmed using a resistor divider from OUT to GND, with the midpoint connected to the OVP pin. The internal 1.22V threshold determines trip point: V_OVP = 1.22V × (1 + R2/R3). Upon exceeding this voltage (e.g., due to open LED), the IC shuts down and latches off - no switching occurs until EN is toggled low-then-high or VIN is cycled. This prevents repeated stress on components during fault conditions.

Does the MP3306EG-LF-Z support parallel LED strings?

No. The MP3306EG-LF-Z is designed for single-string constant-current operation. Its FB pin senses voltage across one external current-sense resistor in series with a single LED string. Driving parallel strings would require individual sense resistors and separate FB paths - which the device does not support. For multi-string applications, use multiple MP3306EG-LF-Z units or a matrix-driver IC.

MP3306EG-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 12-TFQFN

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):: 3V

Voltage - Supply (Max):: 12V

Voltage - Output:: 30V

Current - Output / Channel:: 1.8A (Switch)

Frequency:: 690kHz

Dimming:: Analog, PWM

Applications:: Backlight

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 12-QFN (2x2)

MP3306EG-LF-Z FAQ

1.How can I place an order for MP3306EG-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP3306EG-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 MP3306EG-LF-Z reliable?

The price and inventory of MP3306EG-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 MP3306EG-LF-Z is usually 5 days.

3.What payment methods are accepted for MP3306EG-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3306EG-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP3306EG-LF-Z?

MP3306EG-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP3306EG-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 MP3306EG-LF-Z?

For technical support, including MP3306EG-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3306EG-LF-Z requirements.

6.How does Aetrix verify that MP3306EG-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP3306EG-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 MP3306EG-LF-Z meets industry standards.

7.What is the process for return or replacement of MP3306EG-LF-Z?

All MP3306EG-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3306EG-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 MP3306EG-LF-Z part is unused and in its original packaging.

Return procedure for MP3306EG-LF-Z:

1.Submit a request within 90 days.

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

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