Monolithic Power Systems Inc. MP3362GJ-P

Overview

MP3362GJ-P from Monolithic Power Systems is a fixed-frequency, current-mode boost LED driver IC designed for single-string white LED applications requiring 3V minimum input and up to 36V output. It integrates an 80mΩ/40V internal N-channel MOSFET, supports analog and PWM dimming on a shared EN/DIM pin, delivers up to 95% efficiency at 1MHz, and features 0.2V feedback threshold for high-current-sense accuracy.

For engineers reviewing the MP3362GJ-P datasheet, MP3362GJ-P pinout, MP3362GJ-P application, or MP3362GJ-P equivalent, key selection criteria include its 3–36V input range, 4A peak switch current limit, TSOT23-8 thermal performance (θJA = 100°C/W), dual-dimming mode detection logic (<2kHz = PWM, >5kHz = analog), and integrated protections including OVP, short-FB, and thermal shutdown.

Technical Context

The MP3362GJ-P implements peak-current-mode control with slope compensation to stabilize operation above 50% duty cycle. Its error amplifier (250μA/V transconductance) regulates LED current via a 0.2V FB reference and external R_FB, while COMP pin allows full loop compensation tuning using external RC networks.

Switching frequency is programmable from 200kHz to 2.2MHz via ROSC resistor or external SYNC signal (200kHz–2.2MHz), enabling EMI optimization. Protection architecture includes cycle-by-cycle current limiting (4A typ.), latch-off OCP (6.5A), UVLO (2.5V rising), and OVP sensing via dedicated pin with 1.18V threshold and 100mV hysteresis.

Key Specifications

Pinout & Package

MP3362GJ-P is housed in a thermally enhanced TSOT23-8 package (JEDEC MO-193BA), with 0.65mm pitch, exposed pad for improved θ_JA (100°C/W), and MSL Level 1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ3326GQ-A, MP3362GJ-P offers higher peak current (4A vs. 3.5A) and simpler dimming interface, but lacks AEC-Q100 certification; versus LT3466-1EDD, it provides integrated OVP sensing and unified EN/DIM functionality at the cost of slightly lower max output voltage (36V vs. 40V).

Availability

MP3362GJ-P is available at Aetrix Electronics and suitable for medium-sized LCD backlighting, industrial panel lighting, and automotive interior lighting requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MP3362GJ-P 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 manufacturing partnerships.

The MP3362 belongs to MPS's LED driver product line, engineered specifically for high-efficiency, single-string boost topologies in space-constrained and thermally demanding lighting applications - emphasizing integration, protection, and dimming flexibility.

FAQ

What dimming modes does MP3362GJ-P support, and how are they selected?

The MP3362GJ-P supports both PWM and analog dimming on the EN/DIM pin. A <2kHz input signal triggers PWM dimming (IC switches fully on/off per cycle), while a >5kHz signal enables analog dimming (LED current scaled proportionally to duty cycle). No external configuration is needed - mode detection is automatic and internal.

Can MP3362GJ-P drive more than 10 white LEDs in series?

Yes - with a 36V maximum output and typical white LED forward voltage of ~3.3V, MP3362GJ-P can reliably drive up to 10–11 LEDs in series at room temperature. At elevated temperatures or with higher-VF bins, derating to 9 LEDs ensures margin against OVP trip during thermal drift.

How is over-voltage protection implemented, and what external components are required?

OVP is implemented via the dedicated OVP pin, which monitors output voltage through an external resistive divider. When the divided voltage reaches 1.18V, switching halts. The threshold is set using Equation (7) from the datasheet: V_OVP = 1.2V × (R_OVP1 + R_OVP2) / R_OVP2. No active components are required beyond the two resistors.

Does MP3362GJ-P require an external Schottky diode, and what are its voltage/current requirements?

Yes - an external Schottky diode is mandatory in the boost path. It must have a reverse voltage rating exceeding the OVP threshold (e.g., ≥40V for 36V output) with 20% margin, and average current rating ≥2× the LED current (e.g., ≥400mA for 200mA I_LED) to handle ripple and thermal derating.

What is the minimum recommended inductance for stable continuous conduction mode (CCM) operation?

The minimum inductance is calculated per Equation (4) in the datasheet: L_MIN = V_IN(V_O − V_IN) / (V_O × ΔI_L × f_SW). For V_IN = 12V, V_O = 36V, ΔI_L = 0.4 × I_LED, and f_SW = 1MHz, L_MIN ≈ 3.2μH. A 4.7μH/9.5mΩ shielded inductor is validated in the typical application.

Is the TSOT23-8 package of MP3362GJ-P RoHS-compliant and lead-free?

Yes - MP3362GJ-P is fully RoHS-compliant, lead-free, and halogen-free per MPS green policy. The TSOT23-8 package uses matte-tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1, allowing unlimited floor life at ≤30°C/60% RH.

How does the soft-start function operate, and what is its maximum duration?

Soft-start limits COMP pin current to ~10μA until FB reaches 80% of 200mV (160mV), preventing inrush current and output overshoot. The maximum soft-start time is capped at 10ms to avoid indefinite delay during deep analog dimming - ensuring predictable turn-on behavior across all operating conditions.