Monolithic Power Systems Inc. MP3363GJ-Z

Overview

MP3363GJ-Z from Monolithic Power Systems is a single-string boost LED driver IC with 1.8V minimum input voltage, 36V maximum output voltage, 1A peak switch current limit, 0.2V feedback threshold, and configurable 200kHz–2.2MHz switching frequency-designed for LCD backlighting and portable lighting where low-VIN operation and dual dimming modes are required.

For engineers reviewing the MP3363GJ-Z datasheet, MP3363GJ-Z pinout, MP3363GJ-Z application, or MP3363GJ-Z equivalent, this page delivers verified technical context, TSOT23-8 package mapping, EN/DIM dual-mode dimming behavior, OVP/UVLO protection thresholds, and real-world design implications for LED current regulation and thermal shutdown recovery.

Technical Context

The MP3363GJ-Z implements fixed-frequency current-mode control with internal 100mΩ/40V N-channel MOSFET, enabling stable LED current regulation across 1.8V–36V input range. Its error amplifier features 250μA/V transconductance and COMP pin compensation for loop stability under varying load and input conditions.

Dimming is implemented via shared EN/DIM pin: PWM dimming (f<2kHz) disables switching during low phase; analog dimming (f>5kHz) linearly scales LED current using duty-cycle-dependent VFB scaling per I_LED = (0.2V × Duty)/R_FB. Protection includes UVLO (1.6V threshold), OVP (1.2V reference), short-FB-to-GND detection (50mV clamp), and thermal shutdown at 170°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MP3363GJ-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), rated MSL1, with exposed pad for improved heat dissipation. Pin 1 is marked by dot or beveled edge at lower-left corner in top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT3466-1EDD#TRPBF and TPS61165DRVR, MP3363GJ-Z uniquely supports 1.8V start-up, integrated MOSFET, and true dual-mode dimming on one pin-making it optimal for compact, battery-powered LED systems demanding both efficiency and flexible brightness control.

Availability

MP3363GJ-Z is available at Aetrix Electronics and suitable for LCD backlighting, portable medical device illumination, and industrial HMI indicator lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP3363GJ-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 power management ICs, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The MP3363 belongs to MPS's LED driver product line, engineered specifically for single-string boost architectures in space- and efficiency-constrained applications such as portable displays and automotive interior lighting.

FAQ

What is the minimum input voltage required for MP3363GJ-Z to start switching?

The MP3363GJ-Z begins operation when VIN rises above its UVLO threshold of 1.6V (typical), with 100mV hysteresis. It sustains regulation down to 1.8V across temperature and load-enabling direct use with two alkaline or NiMH cells without boost pre-regulation.

How does the EN/DIM pin distinguish between PWM and analog dimming modes?

The EN/DIM pin detects dimming signal frequency: below 2kHz triggers PWM dimming (IC stops switching during low phase); above 5kHz activates analog dimming (ILED scales linearly with duty cycle). Signals between 2–5kHz are undefined and should be avoided.

Can MP3363GJ-Z drive multiple parallel LED strings?

No-MP3363GJ-Z is a single-string controller. Driving parallel strings requires individual current-setting resistors and risks mismatched brightness due to V_F variance. For multi-string designs, use multiple MP3363GJ-Z units or a dedicated multi-channel driver like MPQ3367.

What is the purpose of the OVP pin, and how is its threshold set?

The OVP pin monitors output voltage via a resistor divider. When voltage at OVP exceeds 1.2V, the IC halts switching to protect LEDs and internal circuitry. Threshold is set using Equation: V_OVP = 1.2V × (1 + R_OVP1/R_OVP2), typically configured for 10–20% above nominal V_OUT.

Does MP3363GJ-Z require an external Schottky diode, and what specifications are critical?

Yes-an external Schottky diode is mandatory. Select one with reverse voltage rating >1.2× V_OVP (e.g., ≥40V for 36V output) and average current rating ≥2× I_LED. Low forward voltage (≤0.4V) and fast recovery (<50ns) minimize conduction loss and EMI.

How does short-FB-to-GND protection operate, and what triggers it?

If V_FB drops below 50mV and COMP remains saturated for 20ms, the IC disables switching. This prevents damage from accidental FB grounding or failed R_FB. Recovery occurs automatically once V_FB rises above 50mV and COMP exits saturation.

Is thermal shutdown latched or auto-recovering?

Thermal shutdown is auto-recovering: switching resumes when die temperature falls below (170°C − 20°C) = 150°C. No external reset is needed, enabling robust operation in thermally constrained enclosures without manual intervention.