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

Monolithic Power Systems Inc. MP3397ES-LF-Z

Name: MP3397ES-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP3397ES-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP3397ES-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: LED Drivers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: MP3397ES-LF-Z.pdf

Description:: IC LED DRV CTRL PWM 350MA 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP3397ES-LF-Z from Monolithic Power Systems is a 4-string, step-up white LED driver IC designed for large-size LCD panel backlighting. It delivers up to 350mA per string with 2.5% current matching accuracy, operates from 5V–28V input, and uses external MOSFET control via a 16-pin SOIC package. It supports both external PWM and DC-input burst dimming for precise brightness control in flat-panel displays.

For engineers reviewing the MP3397ES-LF-Z datasheet, MP3397ES-LF-Z pinout, MP3397ES-LF-Z application, or MP3397ES-LF-Z equivalent, key selection criteria include its programmable switching frequency (145–600 kHz), open/short LED protection architecture, cascading capability for expanded channel count, and internal 6V LDO regulator for gate drive and logic supply.

Technical Context

The MP3397ES-LF-Z implements a peak-current-mode, fixed-frequency boost controller with four independent, matched current sinks for LED string regulation. Its internal error amplifier compares ISET-set reference voltage (1.23 V) against sensed string current, while COMP pin enables loop compensation for stability across varying output loads and LED forward voltages.

Dimming is implemented via two distinct modes: externally applied PWM on DBRT (with BOSC grounded via resistor), or DC analog voltage (0.2–1.2 V) on DBRT that modulates an internally generated DPWM signal whose frequency is set by BOSC capacitor (1.0–2.0 kHz typical). Protection includes OVP threshold detection at 1.23 V on OVP pin, LEDX UVLO at 196 mV, and thermal shutdown at 150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	5 V to 28 V - supports wide-range industrial and display power rails without pre-regulation
Max LED Current per String	350 mA - enables high-brightness WLED arrays for large-format LCD backlights
Current Matching Accuracy	±2.5% - ensures uniform luminance across 4 strings without external calibration
Switching Frequency Range	145 kHz to 600 kHz - adjustable via OSC resistor to optimize EMI, efficiency, and inductor size
Dimming Control Modes	External PWM (100 Hz–20 kHz) or DC-input burst PWM - provides flexible system-level brightness interface options
OVP Threshold	1.23 V on OVP pin - programmable overvoltage protection using resistor divider for safe open-string fault response
Thermal Shutdown	150 °C - internal sensor disables switching to prevent permanent junction damage under overload

Pinout & Package

The MP3397ES-LF-Z is housed in a 16-pin SOIC package with standard 1.27 mm pitch, RoHS-compliant lead finish, and exposed pad not present. Thermal resistance θ_JA is 80 °C/W on a 4-layer PCB.

Pin/Terminal	Circuit Role	Design Meaning
1 COMP	Loop Compensation Node	Connects to ceramic capacitor to stabilize feedback control loop; critical for transient response and stability
2 EN	Enable Input	Logic-level control (1.8 V turn-on, 0.6 V turn-off) for full-system power sequencing
3 DBRT	Brightness Control Input	Accepts either external PWM signal or 0.2–1.2 V DC for linear dimming duty cycle programming
4 GND	Signal Ground Reference	Common return for analog and digital circuitry; must be low-impedance and separated from PGND
5 OSC	Oscillator Frequency Set	Resistor-to-GND sets switching frequency; internal 1.23 V reference enables precise f_SW calculation
6 ISET	LED Current Programming	Resistor-to-GND sets per-string current; regulated 1.23 V reference ensures accurate current scaling
7 BOSC	Burst Oscillator Timing	Capacitor-to-GND sets internal DPWM frequency; resistor-to-GND enables external PWM mode
8–11 LED1–LED4	String Cathode Outputs	Open-drain current sinks; each drives one WLED string cathode with matched regulation
12 OVP	Over-Voltage Protection Sense	Resistor-divider input monitoring output bus; triggers shutdown when voltage exceeds 1.23 V
13 ISENSE	Inductor Current Sense	Peak-current-mode control input; tied to GND if not used in cascaded configurations
14 GATE	External MOSFET Driver	Drives N-channel power MOSFET gate; 4 Ω source / 2 Ω sink impedance supports fast switching
15 VIN	Main Power Input	Supplies IC bias and boost converter; requires local 4.7 µF + 220 µF bypassing
16 VCC	Internal 6 V Regulator Output	Provides gate drive and internal logic supply; drops to 0 V during shutdown

Key Features

Feature	Design Value
4-channel current-matched LED driving	2.5% inter-string current matching enables uniform backlight luminance without per-string trimming
Cascadable architecture	Multiple MP3397ES-LF-Z ICs can share single boost stage and COMP node for >4-string systems
Programmable OVP and UVLO thresholds	OVP set via resistor divider; input UVLO hysteresis of 200 mV prevents supply bounce-induced toggling
Dual dimming interface support	Hardware-selectable between external PWM and DC-analog input avoids firmware dependency
Comprehensive fault protection	Detects open/short LED strings, overvoltage, overtemperature, and undervoltage-latches or auto-restarts per fault type

Applications

Desktop LCD Flat Panel Displays

Flat Panel Video Displays

Use Scenario: Backlighting for 24–32 inch desktop monitors with 10–14 LEDs per string and 4 parallel strings.

IC Role / Device Role / Timing Role: Step-up controller and per-string current regulator; manages boost voltage generation and synchronized PWM dimming timing.

Use Value: Delivers stable 350 mA per string with <2.5% mismatch, enabling consistent brightness and color uniformity across full display area.

Use Scenario: High-brightness video wall tiles requiring scalable backlight control across multiple panels.

IC Role / Device Role / Timing Role: Cascaded LED driver node; shares COMP and VCC with master unit to synchronize 8+ strings from one boost stage.

Use Value: Eliminates need for separate inductors per driver, reducing BOM cost and board space while maintaining tight current matching.

2D/3D LCD TVs

Industrial Human-Machine Interfaces

Use Scenario: Local dimming zones in mid-size LCD TVs (32–55 inch) with dynamic contrast enhancement.

IC Role / Device Role / Timing Role: Primary LED current controller with fast-response dimming; supports 200 Hz–5 kHz external PWM for flicker-free motion clarity.

Use Value: Enables >1000:1 dynamic contrast ratio via precise 0.75–100% dimming duty range without visible stepping artifacts.

Use Scenario: Ruggedized medical or factory-floor displays operating in extended temperature ranges (−40°C to +85°C).

IC Role / Device Role / Timing Role: Fault-tolerant backlight driver with open/short LED detection and thermal shutdown for unattended operation.

Use Value: Maintains display visibility during partial LED failure and prevents thermal runaway in sealed enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ3326-AEC1	Automotive-grade AEC-Q100 qualified; same 4-string, 350 mA/string rating but with integrated MOSFET and lower max input (18 V)	Designed for automotive infotainment displays; lacks cascading capability and external MOSFET flexibility	Select when automotive qualification and smaller solution size outweigh need for 28 V input or multi-IC expansion
LM3409QMY/NOPB	Single-string buck-boost LED driver; no native multi-string current matching; requires external current mirrors for >1 string	Targeted at general-purpose LED lighting; lacks integrated OVP/UVLO comparators and dedicated dimming oscillator	Select only for low-channel-count designs where discrete current balancing is acceptable and cost is primary constraint

Compared with MP3397ES-LF-Z, MPQ3326-AEC1 trades cascading and 28 V input headroom for automotive compliance and integration, while LM3409QMY/NOPB requires significant external circuitry to match basic 4-string functionality-making MP3397ES-LF-Z optimal for scalable, high-accuracy LCD backlight systems.

Availability

MP3397ES-LF-Z is available at Aetrix Electronics and suitable for desktop LCD flat panel displays, 2D/3D LCD TVs, and industrial human-machine interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP3397ES-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, and global distribution through authorized partners.

The MP3397 product line targets large-format LCD backlighting applications, delivering high-efficiency, multi-string LED current regulation with integrated protection and flexible dimming-optimized for reliability and manufacturability in display manufacturing.

FAQ

What is the maximum total output current capability of MP3397ES-LF-Z?

The MP3397ES-LF-Z supports up to 350 mA per string across four independent channels, yielding a maximum total regulated LED current of 1.4 A. This assumes all strings operate simultaneously at rated current, with adequate thermal management and proper external component selection (inductor, MOSFET, output capacitor) to maintain efficiency and stability.

Can MP3397ES-LF-Z drive more than four LED strings?

Yes-MP3397ES-LF-Z supports cascading: two or more units can operate in parallel from a single boost inductor and output capacitor. The master IC controls GATE and COMP; slave ICs tie their COMP and VCC pins to the master's, disable ISENSE (tie to GND), and route EN/DBRT/BOSC signals in common. This scales to 8, 12, or more strings without sacrificing current matching.

How does the MP3397ES-LF-Z handle an open LED string fault?

When an LED string opens, its corresponding LEDX pin voltage drops below 196 mV, triggering open-string detection. The IC marks that string as faulty and continues regulating remaining strings using the highest-voltage LEDX pin as feedback reference. If all strings open, the boost converter shuts down after reaching OVP threshold to prevent overvoltage damage.

What is the minimum recommended input capacitance for stable operation?

A minimum of 4.7 µF X5R/X7R ceramic capacitor in parallel with a 220 µF electrolytic capacitor is recommended at VIN. This combination suppresses high-frequency switching noise and limits surge current draw. The ceramic capacitor must be placed within 5 mm of VIN and GND pins; the bulk capacitor should be located near the input connector to minimize PCB trace inductance.

Does MP3397ES-LF-Z require an external Schottky diode in the boost path?

Yes-an external Schottky diode is required between the boost inductor output and the LED anode bus. The diode must withstand the maximum output voltage (up to ~30 V) and conduct peak inductor current (≥1.5× RMS LED current). Typical selection is a 40 V, 3 A Schottky with <0.5 V forward drop to minimize conduction loss and improve efficiency.

What is the role of the ISENSE pin in normal operation?

In standard single-IC operation, ISENSE senses voltage across the external current-sense resistor (R_SENSE) to implement peak-current-mode control and cycle-by-cycle current limiting. It must be tied to GND only in cascaded configurations where the master IC handles sensing; leaving it floating in standalone use will cause malfunction or shutdown.

Is the MP3397ES-LF-Z compatible with PWM dimming frequencies above 20 kHz?

No-the datasheet specifies a maximum external PWM dimming frequency of 20 kHz. Operation above this limit may result in incomplete duty cycle recognition due to internal sampling constraints and reduced dimming resolution. For high-frequency flicker-free dimming, use DC-input burst mode with BOSC capacitor tuned for 1.0–2.0 kHz internal DPWM frequency instead.

MP3397ES-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Type:: DC DC Controller

Topology:: Step-Up (Boost)

Internal Switch(s):: No

Number of Outputs:: 4

Voltage - Supply (Min):: 5V

Voltage - Supply (Max):: 28V

Voltage - Output:: -

Current - Output / Channel:: 350mA

Frequency:: 540kHz

Dimming:: PWM

Applications:: Backlight

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

MP3397ES-LF-Z FAQ

1.How can I place an order for MP3397ES-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP3397ES-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 MP3397ES-LF-Z reliable?

The price and inventory of MP3397ES-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 MP3397ES-LF-Z is usually 5 days.

3.What payment methods are accepted for MP3397ES-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3397ES-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP3397ES-LF-Z?

MP3397ES-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP3397ES-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 MP3397ES-LF-Z?

For technical support, including MP3397ES-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3397ES-LF-Z requirements.

6.How does Aetrix verify that MP3397ES-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP3397ES-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 MP3397ES-LF-Z meets industry standards.

7.What is the process for return or replacement of MP3397ES-LF-Z?

All MP3397ES-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3397ES-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 MP3397ES-LF-Z part is unused and in its original packaging.

Return procedure for MP3397ES-LF-Z:

1.Submit a request within 90 days.

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

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