Monolithic Power Systems (MPS) MPQ4324 Synchronous Step-Down Converters
Monolithic Power Systems (MPS) MPQ4324 Synchronous Step-Down Converters are highly configurable devices that support switching frequencies from 350kHz to 2.5MHz. Each device integrates both high‑side and low‑side MOSFETs, delivering 0.5A to 3A of continuous output current and up to 4A peak with peak‑current‑mode control for fast transient response and stable operation. The MPS MPQ4324 converters are offered in multiple compact package options, including QFN‑12 (2mm × 3mm), QFN‑12 (3mm × 4mm), and QFN‑14 (2.5mm × 3.5mm), and meet AEC‑Q100 Grade 1 automotive qualification standards.
Designed for demanding automotive environments, the MPQ4324 operates from a wide 3.3V to 36V input range and tolerates 42V load‑dump events, making the devices suitable for a broad range of step‑down applications. An ultra‑low 1µA shutdown quiescent current enables efficient use in battery‑powered systems. To maximize efficiency across varying loads, the devices automatically reduce the switching frequency during light‑load conditions, minimizing switching and gate‑drive losses.
The MPS MPQ4324 converters include a robust set of protection and monitoring features. An open‑drain power‑good (PG) indicator asserts when the output remains within 94.5% to 105.5% of the nominal voltage. Frequency foldback safeguards against inductor current runaway during startup, while thermal shutdown ensures reliable performance under fault conditions. A high‑duty‑cycle, low‑dropout mode further enhances operation during automotive cold‑crank scenarios.
Features
- Designed for automotive applications
- Survives 42V load dump
- Up to 36V continuous operation
- Supports cold crank down to 3.1V
- Low-dropout (LDO) mode with soft recovery
- 0.5A to 3A continuous and 4A peak output current (IOUT) version in pin-compatible family
- 65ns minimum on time and 50ns minimum off time
- Available in AEC-Q100 Grade 1
- Increases battery life
- 1μA shutdown supply current
- 20μA sleep mode quiescent current (IQ)
- Advanced asynchronous modulation (AAM) mode increases efficiency under light loads
- Integrated 70mΩ high-side MOSFET (HS-FET) and 50mΩ low-side MOSFET (LS-FET)
- Power good (PG) output
- 1V, 1.8V, 2.5V, 3.0V, 3.3V, 3.8V, and 5V fixed output voltage (VOUT) options
- Optimized for EMC/EMI
- CISPR 25 Class 5 compliant
- Configurable 350kHz to 2.5MHz switching frequency (fSW) range
- Frequency spread spectrum (FSS) modulation
- Symmetric VIN pinout
- MeshConnect™ flip-chip package
- Available packages with wettable flanks
- QFN-12 (2mm x 3mm)
- QFN-12 (3mm x 4mm)
- QFN-14 (2.5mm x 3.5mm)
- Over-current protection (OCP) with hiccup mode
- Functional safety system design capability, MPSafe™ QM system design
- Moisture Sensitivity Level (MSL) 1
- Lead-free, Halogen-free, and RoHS-compliant
Applications
- Automotive infotainment
- Automotive clusters
- Advanced Driver-Assistance Systems (ADAS)
- Industrial power systems
Specifications
- 3.3V to 36V operating supply voltage range (VIN)
- 3.9V minimum operating VIN for start-up
- 3.1V minimum operating VIN after start-up
- 0.8V to 0.95 x VIN operating output voltage range
- 28µA to 80µA maximum VIN quiescent current range
- Maximum continuous power dissipation
- 3.5W for QFN-12 (2mm x 3mm)
- 3.6W for QFN-12 (3mm x 4mm)
- 3.7W for QFN-14 (2.5mm x 3.5mm)
- 99.5% typical duty cycle
- +160°C to +185°C thermal shutdown range
- +20°C typical thermal shutdown hysteresis
- -40°C to +150°C operating junction temperature range
- +260°C maximum lead temperature
- ESD ratings
- Human body model (HBM) Class 2
- Charged-device model (CDM) Class C2b
Typical Applications
Functional Block Diagrams
