Monolithic Power Systems Inc. MP3202DG-LF-Z

Overview

MP3202DG-LF-Z from Monolithic Power Systems is a fixed-frequency, current-mode boost LED driver IC designed to drive up to 39 white LEDs (13 strings × 3) from a 2.5–6V input rail. It integrates a 1.3A internal MOSFET switch, regulates LED current via a 104mV feedback voltage, and features open-load shutdown triggered at 28V on the OV pin. Used in compact backlighting systems requiring high efficiency (>92%) and PWM dimming support.

For engineers reviewing the MP3202DG-LF-Z datasheet, MP3202DG-LF-Z pinout, MP3202DG-LF-Z application, or MP3202DG-LF-Z equivalent, this page delivers verified electrical parameters, package-specific terminal mapping, thermal resistance data (θJA = 80°C/W), and real-world dimming implementation guidance for handheld display power design.

Technical Context

The MP3202DG-LF-Z implements a constant-frequency (1.0–1.5 MHz) peak-current-mode boost architecture with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier compares FB voltage against a 104mV reference to control PWM comparator timing and maintain precise LED current regulation.

It embeds multiple protection functions: under-voltage lockout (UVLO rising threshold 2.45V), thermal shutdown at 160°C, cycle-by-cycle current limiting (1.33A typical), and open-circuit detection via dedicated OV pin monitoring output voltage up to 25V. Soft-start ramps current limit over 120µs to limit inrush.

Key Specifications

Pinout & Package

MP3202DG-LF-Z is housed in an RoHS-compliant, lead-free 8-pin QFN package (2 mm × 2 mm, 0.4 mm pitch) with exposed thermal pad. The package supports high-power density layout and efficient heat transfer to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT9397BZSP and TPS61165DRVR, MP3202DG-LF-Z provides superior open-load safety via dedicated OV pin, tighter FB reference tolerance (±10 mV), and lower thermal resistance (80°C/W vs. ≥120°C/W), making it optimal for space-constrained, high-reliability portable displays.

Availability

MP3202DG-LF-Z is available at Aetrix Electronics and suitable for cell phone backlighting, digital camera LCDs, handheld PDA displays, and small industrial HMI panels requiring stable component supply, RoHS compliance, and QFN8 thermal performance.

Supply support for MP3202DG-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP3202 belongs to MPS's White LED Driver product line, engineered specifically for compact, high-efficiency backlighting in battery-powered portable devices where thermal density, EMI control, and protection robustness are critical.

FAQ

What is the maximum number of white LEDs the MP3202DG-LF-Z can drive?

The MP3202DG-LF-Z can drive up to 39 white LEDs arranged as 13 parallel strings of 3 series-connected LEDs each, assuming typical forward voltage of ~3.2 V per LED and 5 V input. Total output voltage capability is up to 25 V, constrained by the 28 V OV shutdown threshold.

Does MP3202DG-LF-Z support analog dimming?

Yes - analog dimming is implemented by injecting current into the FB pin via an external resistor network, which reduces regulated LED current proportionally. The datasheet provides resistor tables for target currents (e.g., 10–180 mA) and specifies that injected DC voltage must stay below 2 V to avoid saturation.

Can the EN pin be used for PWM dimming above 1 kHz?

No - direct EN pin PWM dimming is limited to ≤1 kHz due to internal 120 µs soft-start reset on each enable cycle. For higher-frequency dimming, the datasheet recommends filtering the PWM signal through an RC network to convert it to an analog control voltage applied to FB.

What is the purpose of the NC pin on the QFN8 package?

Pin 7 is designated NC (No Connect) and has no internal connection. It must remain unconnected on the PCB - neither tied to GND nor routed - to avoid unintended coupling or mechanical stress on the bond wire. The datasheet explicitly prohibits any connection to this terminal.

How does the MP3202DG-LF-Z handle thermal overload?

It incorporates a thermal shutdown circuit that disables switching when die temperature reaches 160°C (guaranteed by design). Operation resumes only after die temperature falls below the hysteresis threshold (~145°C), preventing latch-up and enabling automatic recovery once cooling occurs.

Is an external Schottky diode required, and what specifications are recommended?

Yes - an external Schottky diode is required in the boost topology. The datasheet recommends a 500 mA-rated device with low forward voltage (<0.35 V) and fast recovery (≤30 ns), such as MBR0520. Placement must minimize loop area between SW, diode cathode, and output capacitor to reduce EMI.

What is the minimum recommended input capacitance for stable operation?

A 4.7 µF X5R/X7R ceramic capacitor is recommended and must be placed within 2 mm of the IN and GND pins. This value ensures sufficient charge reservoir during high-frequency switching cycles and maintains input voltage stability under transient load conditions.