Monolithic Power Systems Inc. MPQ4340GLE-33-AEC1-P

Overview

MPQ4340GLE-33-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering up to 4A output current at fixed 3.3V with ultra-low 1µA shutdown current, 350kHz–2.5MHz configurable switching frequency, and integrated 60mΩ/35mΩ HS/LS MOSFETs. It supports automotive cold-crank (down to 3.1V VIN) and 42V load dump, operating across –40°C to +150°C junction temperature in ADAS power rails.

For engineers reviewing the MPQ4340GLE-33-AEC1-P datasheet, MPQ4340GLE-33-AEC1-P pinout, MPQ4340GLE-33-AEC1-P application, or MPQ4340GLE-33-AEC1-P equivalent, key selection criteria include its multi-phase capability, zero-delay PWM control for fast transient response, wettable-flank QFN-17 package for automated optical inspection, and AAM mode enabling <3µA quiescent current under light loads.

Technical Context

The MPQ4340GLE-33-AEC1-P implements a fixed-frequency zero-delay PWM (ZDP) control architecture with programmable frequency via external resistor on FREQ pin, supporting both forced continuous conduction mode (FCCM) and advanced asynchronous modulation (AAM) for efficiency optimization. Its internal gate drivers enable 20ns minimum on-time and support high-duty-cycle operation during cold-crank conditions.

It integrates dual power MOSFETs (60mΩ HS-FET, 35mΩ LS-FET), bootstrap charging circuitry (BST/SW), and multi-phase current-sharing interface (ICS) for parallel operation. The device features open-drain PG output with ±3% trip threshold hysteresis, thermal shutdown at 150°C, and hiccup-mode over-current protection triggered by valley current sensing on the low-side switch.

Key Specifications

Pinout & Package

MPQ4340GLE-33-AEC1-P uses a thermally enhanced QFN-17 (3mm × 4mm) package with wettable flanks for solder joint inspection. Pin 1 is marked by a dot; top view orientation matches standard JEDEC QFN layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MPQ4340JGLE-33-AEC1-P, the MPQ4340GLE-33-AEC1-P saves board space and cost in single-phase designs by consolidating PG/PHASE functionality, while TPS543320RTWR trades automotive robustness for simpler layout in benign environments.

Availability

MPQ4340GLE-33-AEC1-P is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, infotainment head units, and industrial telematics requiring stable component supply with AEC-Q100 compliance and long-lifecycle support.

Supply support for MPQ4340GLE-33-AEC1-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 for automotive, industrial, and consumer markets, with design centers in the US, China, and Taiwan.

The MPQ4340 product line delivers ultra-low IQ, multi-phase capable buck converters targeting demanding automotive power rails-designed specifically for ADAS, infotainment, and body electronics where efficiency, thermal resilience, and AEC-Q100 reliability are mandatory.

FAQ

What is the minimum input voltage required for regulation at full 4A load?

The MPQ4340GLE-33-AEC1-P maintains regulation down to 3.3V input at full 4A load in low-dropout (LDO) mode, verified across temperature. At cold-crank conditions (VIN = 3.1V), it sustains partial regulation with reduced current capability, as specified in the datasheet's low-VIN performance curves.

How is the power-good (PG) signal configured for open-drain operation?

PG/PHASE operates as an open-drain output requiring an external pull-up resistor (typically 10kΩ to 3.3V or 5V). When VOUT is within 94–106% of 3.3V, PG pulls high; outside that window, it goes low. In multi-phase setups, the same pin serves as phase-shift control when a resistor is connected to AGND.

Can this device be synchronized to an external clock, and what is the acceptable frequency range?

Yes-drive the SYNCIN/MODE pin with an external clock signal. The device accepts input frequencies from 90% to 115% of its free-running fSW (e.g., 315–2.875MHz for nominal 350kHz–2.5MHz range), enabling precise phase alignment across multiple rails in complex automotive ECUs.

What is the purpose of the ICS pin, and how should it be connected in single-phase operation?

The ICS pin enables current sharing in multi-phase configurations. For single-phase use, connect ICS directly to VCC (5V bias rail). Floating ICS is prohibited; incorrect connection causes undefined behavior and potential overcurrent in parallel configurations.

Does the MPQ4340GLE-33-AEC1-P support spread-spectrum frequency modulation (FSS)?

Yes-it integrates frequency spread spectrum (FSS) modulation to reduce peak EMI emissions. This feature is enabled by default and contributes to CISPR25 Class 5 compliance without requiring external components or configuration pins.

What is the thermal performance difference between QFN-17 and QFN-19 packages?

On the MPS evaluation board (8.3cm × 8.3cm, 4-layer, 2oz Cu), QFN-17 achieves θJA = 29.2°C/W and θJC = 5.2°C/W, while QFN-19 measures θJA = 30.3°C/W and θJC = 5.4°C/W-nearly identical thermal performance, with QFN-17 offering smaller footprint and lower assembly cost for single-phase use.

Is the BST capacitor value dependent on switching frequency or load current?

Yes-the BST capacitor (typically 0.1µF X7R 16V) must be sized based on minimum on-time and peak switch current. Higher fSW or heavier loads increase charge demand; the datasheet provides calculation methodology in "Floating Driver and Bootstrap Charging" section (page 45) using tON_MIN and IOUT_MAX.