Monolithic Power Systems Inc. MPQ4462DN-LF-P

Overview

MPQ4462DN-LF-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, asynchronous step-down DC/DC converter with integrated 150mΩ high-side MOSFET, delivering up to 3.5A output current across a 3.8V–36V input range, programmable switching frequency up to 4MHz, and 120µA quiescent current-designed for automotive infotainment power rails and industrial 24V distributed supplies.

For engineers reviewing the MPQ4462DN-LF-P datasheet, MPQ4462DN-LF-P pinout, MPQ4462DN-LF-P application, or MPQ4462DN-LF-P equivalent, key selection criteria include its AEC-Q100 qualification, 4MHz high-frequency operation for EMI-sensitive AM radio systems, internal current-limiting without sense resistor, ceramic-capacitor compatibility, and SOIC8E package thermal performance at 125°C junction temperature.

Technical Context

The MPQ4462DN-LF-P implements peak-current-mode control with internal error amplifier (200V/V gain, 60µA/V transconductance), programmable oscillator (set via external FREQ pin resistor), and bootstrap-driven high-side gate driver requiring BST–SW capacitor charging during low-duty-cycle intervals. Its current-sense architecture uses a dedicated MOSFET for cycle-by-cycle limiting at 4.0–5.5A.

Operation includes internal soft-start (1.5ms VFB ramp), UVLO with 3.0V rising/2.6V falling thresholds and 400mV hysteresis, thermal shutdown at 150°C with 15°C hysteresis, and minimum ON/OFF times of 80ns/100ns-enabling stable light-load pulse-skipping while preventing inductor-current runaway during startup via frequency foldback.

Key Specifications

Pinout & Package

The MPQ4462DN-LF-P is housed in a RoHS-compliant SOIC8E package (4.9mm × 6.0mm × 1.75mm) with exposed thermal pad, rated for 2.5W power dissipation at T_A = +25°C and θ_JA = 50°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with MPQ4462DN-LF-P, the QFN variant offers identical electrical specs with improved thermal resistance, while LM61460-Q1 trades programmability and ceramic stability for lower quiescent current and higher output current-making MPQ4462DN-LF-P optimal for EMI-sensitive, thermally moderate automotive subsystems requiring design flexibility.

Availability

MPQ4462DN-LF-P is available at Aetrix Electronics and suitable for automotive infotainment power, industrial 24V distributed supply, and telematics always-on rail applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MPQ4462DN-LF-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ4462 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for harsh-environment applications demanding AEC-Q100 qualification, wide input range, and high-frequency EMI control in vehicle subsystems.

FAQ

What is the maximum recommended input voltage for reliable operation at 4MHz?

The MPQ4462DN-LF-P supports up to 36V input, but at 4MHz switching frequency, MPS recommends VIN ≤12V to ensure sufficient minimum ON-time (80ns) and stable bootstrap capacitor charging. At higher input voltages, pulse skipping increases and efficiency degrades due to reduced duty cycle margin.

Can the MPQ4462DN-LF-P operate without an external bootstrap diode?

Yes-the MPQ4462DN-LF-P integrates a bootstrap regulator that charges the BST capacitor from VIN through an internal PMOS when SW is low. An external diode is only required for VIN <5V, high-duty-cycle operation (>65%), or when BST voltage droop occurs at light loads; typical 12V automotive applications function reliably without it.

How does the internal current limit function without a sense resistor?

The MPQ4462DN-LF-P uses a dedicated current-sense MOSFET matched to the main power switch. Its drain current is compared to the COMP voltage by a high-speed comparator, enabling accurate cycle-by-cycle current limiting at 4.0–5.5A without external components-reducing BOM cost and layout sensitivity.

Is the SOIC8E package thermally adequate for 3.5A continuous output?

Yes-the SOIC8E package delivers 2.5W continuous power dissipation at +25°C ambient (θ_JA = 50°C/W). With proper PCB design-including thermal vias under the exposed pad and ≥1in² copper pour-the device sustains 3.5A at 125°C junction temperature in automotive under-hood environments.

What compensation components are needed for a 3.3V/3A output with 10µH inductor and 22µF ceramic output capacitor?

Per MPS Application Note AN-4462 Table 2, use R3 = 68.1kΩ, C3 = 220pF, and no C6. This configuration targets ~0.1×f_SW crossover frequency and >60° phase margin. Place R3/C3 within 3mm of COMP/FB pins and avoid routing near SW node to prevent noise coupling.

Does the MPQ4462DN-LF-P support synchronous rectification?

No-the MPQ4462DN-LF-P is an asynchronous buck converter requiring an external Schottky catch diode. It lacks a low-side MOSFET driver or synchronous control logic. For synchronous operation, consider MPS's MPQ4470 or MPQ4423 families.

How is AEC-Q100 Grade 1 qualification verified for this part number?

MPQ4462DN-LF-P undergoes full AEC-Q100 stress testing including HTOL (1000h at 125°C), temperature cycling (−40°C to +125°C, 1000 cycles), and ESD (HBM ±2kV, CDM ±750V), with test reports available upon request. The "-AEC1" suffix in ordering codes denotes qualification; "-LF-P" confirms RoHS-compliant, lead-free plating.