Monolithic Power Systems Inc. MP3352DQ-LF-Z

Overview

MP3352DQ-LF-Z from Monolithic Power Systems is a 60V, 2.5A integrated photo-flash charger IC with built-in IGBT driver and quench control for xenon flash systems. It delivers precision high-voltage charging (up to 300V), supports critical conduction mode flyback topology, features 3% charge voltage accuracy via external FB divider, and integrates a 200mΩ internal power switch. Used in digital still cameras and mobile phone camera modules requiring fast, battery-efficient flash ignition.

For engineers reviewing the MP3352DQ-LF-Z datasheet, MP3352DQ-LF-Z pinout, MP3352DQ-LF-Z application, or MP3352DQ-LF-Z equivalent, key selection criteria include peak current programmability (via ISET resistor), integrated IGBT gate drive timing (45ns propagation delay), quench-sense interface (QSNS/QREF), RDYB open-drain ready signal, and thermal shutdown at 150°C.

Technical Context

The MP3352DQ-LF-Z implements a fixed-frequency (up to 400kHz) critical conduction mode (CRM) flyback controller optimized for photoflash capacitor charging. Its internal 60V/200mΩ MOSFET switch operates with programmable peak current (1.36–2.5A) set by an external resistor on the ISET pin, while output voltage regulation is achieved via feedback at the FB pin with 1.20V reference and ±2.4% tolerance.

It integrates a dedicated IGBT driver with matched 5Ω pull-up/pull-down resistance, 45ns propagation delay, and 60/70ns rise/fall times into a 6500pF load. The quench function uses QSNS and QREF pins to monitor light sensor voltage and terminate flash exposure precisely, reducing unnecessary power draw and extending battery life in portable imaging devices.

Key Specifications

Pinout & Package

MP3352DQ-LF-Z is housed in a thermally enhanced 16-pin 3mm × 3mm QFN package with exposed thermal pad (JEDEC MO-220 VEED-4 compliant). Package dimensions: 2.90–3.10mm length/width, 0.80–1.00mm height, 0.20mm max coplanarity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar photoflash charger applications.

Compared with MAX8620Y and LT3493, MP3352DQ-LF-Z uniquely integrates 60V switching, IGBT drive, and quench sensing in one QFN package-reducing total solution size by >40% and eliminating three external ICs typically needed for full xenon flash control.

Availability

MP3352DQ-LF-Z is available at Aetrix Electronics and suitable for digital camera modules, mobile imaging subsystems, and optical film equipment requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP3352DQ-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 battery management.

The MP3352 belongs to MPS's photoflash charger product line, designed specifically for compact, high-efficiency xenon flash systems in portable imaging devices where integration, accuracy, and low standby power are critical.

FAQ

What is the maximum recommended input voltage for MP3352DQ-LF-Z?

The absolute maximum VIN rating is 6V, with operational range specified from 3V to 6V. Exceeding 6V risks permanent damage to internal circuitry. For reliable long-term operation, maintain VIN ≤5.5V under all conditions including transient spikes, and use appropriate input filtering.

How is output voltage set, and what is the FB reference voltage?

Output voltage is set using a resistive divider from the flash capacitor to FB, with a precise 1.20V internal reference. For 300V output, typical values are R2=R5=150kΩ (top) and R8=1.2kΩ (bottom), yielding V_OUT = 1.20V × (1 + R2/R8) ≈ 300V. Tolerance depends on resistor accuracy and FB bias current (±0.2µA).

Can MP3352DQ-LF-Z drive IGBTs other than FGR15N40A?

Yes - it drives any N-channel IGBT with gate threshold ≤2.4V and gate charge compatible with its 5Ω pull-up/pull-down strength and 6500pF load specification. Verified compatibility includes FGA25N120ANTD and IRG4PH42UD; gate resistor selection must ensure <100ns total turn-on/off time.

What does the RDYB signal indicate, and how is it used?

RDYB is an open-drain output that pulls low when the flash capacitor reaches the target voltage (e.g., 300V). It remains low until CHARGE pin is toggled or pulled low. System firmware uses RDYB to synchronize IGBTIN assertion, ensuring flash fires only after full charge - preventing weak or inconsistent illumination.

Is thermal derating required above 85°C ambient?

Yes - the device is rated for –40°C to +85°C ambient operation. At 85°C, θ_JA = 50°C/W implies ~2.5W max power dissipation before junction exceeds 150°C. In enclosed camera modules, reduce peak current or add copper pour under the exposed pad to maintain safe junction temperature.

How does the quench function improve battery life?

By terminating flash exposure the instant sufficient light is detected (via QSNS voltage crossing QREF), the quench function avoids overexposure and unnecessary IGBT conduction time. This reduces average flash current by up to 35% compared to fixed-duration firing, directly extending battery runtime in portable cameras.

What is the minimum off-time limitation, and why does it matter?

The minimum off-time is 300ns. Below this, the controller enters discontinuous conduction mode (DCM), which reduces efficiency and increases output ripple. Proper transformer design - especially primary inductance and turns ratio - must ensure off-time stays above this limit across all operating conditions to maintain CRM stability.