Monolithic Power Systems (MPS) MPQ4341/4341J Synchronous Step-Down Converters

Monolithic Power Systems (MPS) MPQ4341/4341J Synchronous Step-Down Converters are 36V, 5A configurable frequency (350kHz to 2.5MHz) devices with integrated internal high-side and low-side power MOSFETs (HS-FET and LS-FET, respectively). The converters provide up to 5A of highly efficient output current (IOUT) with fixed-frequency zero-delay PWM (ZDP) control for near-optimal transient responses. A wide 3.3V to 36V input voltage range with 42V load dump support accommodates various step-down applications in automotive input environments. The MPQ4341/4341J converters feature a 1μA shutdown current (ISD) that allows the device to be used in battery-powered applications.

High power conversion efficiency across a wide load range is achieved by scaling down the switching frequency (fSW) under light-load conditions to reduce switching and gate driver losses. An open-drain power good (PG) signal indicates whether the output voltage (VOUT) is within 94% to 106% of the nominal voltage range. Thermal shutdown provides reliable, fault-tolerant operation. High-duty cycle and low-dropout (LDO) modes are provided for automotive cold-crank conditions.

The MPQ4341 is available in a QFN-17 (3mm x 4mm) package, and the MPQ4341J is available in a QFN-19 (3mm x 4mm) package. Both versions are AEC-Q100 qualified.

Features

Designed for automotive applications
- Survives 42V load dump
- Supports up to 3.1V cold crank
- Low-dropout (LDO) mode
- Up to 5A of continuous output current
- Continuous operation up to 36V
- Zero-delay PWM control
- Multi-phase capability
- 20ns minimum on-time
- -40°C to +150°C junction temperature operation range
- Available in AEC-Q100 Grade 1
Increases battery life
- 1μA low shutdown current
- 3μA sleep mode quiescent current
- Advanced asynchronous modulation (AAM) mode increases efficiency under light loads
High performance for improved thermals with an internal 60mΩ high-side MOSFET and 35mΩ low-side MOSFET (HS-FET and LS-FET, respectively)

Optimized for EMC/EMI
- 350kHz to 2.5MHz configurable switching frequency
- Symmetric V_IN pinout
- Frequency Spread Spectrum (FSS) modulation
- CISPR25 Class 5 compliant
- MeshConnect™ flip-chip package
1V, 1.1V, 1.8V, 2.5V, 3V, 3.3V, 3.8V, and 5V fixed output options
Synchronizable to an external clock
Synchronized clock output
Power Good (PG) output
External soft start
Hiccup Over-Current Protection (OCP)
Available packages, both with wettable flanks
- QFN-17 (3mm x 4mm) package for MPQ4340
- QFN-19 (3mm x 4mm) package for MPQ4340J