Monolithic Power Systems Inc. MP4462DN-LF-Z

Overview

MP4462DN-LF-Z from Monolithic Power Systems is a 3.5A, 4MHz, 36V non-synchronous step-down DC/DC converter with integrated 150mΩ high-side MOSFET, 120µA quiescent current, and programmable switching frequency - designed for automotive input environments and battery-powered systems requiring compact, high-efficiency power conversion.

For engineers reviewing the MP4462DN-LF-Z datasheet, MP4462DN-LF-Z pinout, MP4462DN-LF-Z application, or MP4462DN-LF-Z equivalent, key selection criteria include its 3.8–36V input range, internal soft-start, frequency foldback at light load, thermal shutdown protection, and SOIC8E package compatibility with standard PCB assembly processes.

Technical Context

The MP4462DN-LF-Z implements current-mode control with a peak-current PWM architecture, enabling fast transient response and simplified loop compensation via the COMP pin. Its oscillator supports external resistor programming (FREQ pin) across 0.2–4MHz, with 4MHz operation optimized for EMI-sensitive applications like AM radio and ADSL.

It integrates a 2.6V internal regulator, precision 0.8V feedback reference (±3% over temperature), and a dedicated bootstrap driver for the high-side MOSFET, requiring an external BST–SW capacitor. UVLO thresholds (3.0V rising / 2.6V falling) and thermal shutdown (150°C with 15°C hysteresis) ensure robust fault tolerance in industrial and automotive environments.

Key Specifications

Pinout & Package

MP4462DN-LF-Z is housed in an 8-pin SOIC-EP (SOIC8E) package with exposed pad for thermal enhancement. The package meets RoHS-compliant lead-free standards and supports standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4462DN-LF-Z, the MPQ4462DN-AEC1-LF-Z adds automotive qualification without altering footprint or basic functionality, while the LM61480RGER trades programmable frequency and ultra-low IQ for higher current rating and TI-specific design tools - making MP4462DN-LF-Z optimal for space-constrained, battery-sensitive, or EMI-critical 3.5A applications.

Availability

MP4462DN-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and battery-powered telematics units requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for MP4462DN-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP4462 belongs to MPS's high-frequency buck converter product line, engineered specifically for compact, efficient, and EMI-robust power conversion in automotive, industrial, and portable applications where input voltage range and quiescent current are critical.

FAQ

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

The MP4462DN-LF-Z supports 4MHz operation up to 12V input per manufacturer guidelines. At 24V input, maximum recommended frequency drops to 2MHz to maintain sufficient minimum on-time margin and prevent pulse-skipping instability. Exceeding these limits risks reduced duty-cycle resolution and degraded regulation accuracy.

Does the SOIC8E package require an external bootstrap capacitor?

No. Unlike the QFN10 variant, the MP4462DN-LF-Z (SOIC8E) uses an internal charge-pump bootstrap circuit and does not expose the BST pin. This eliminates the need for an external BST capacitor and simplifies layout, though it slightly increases quiescent current compared to the QFN version.

How is output voltage accuracy affected by resistor divider tolerance?

With a nominal 0.8V feedback reference, ±1% resistor tolerance yields ±1.4% total output error (including reference drift). For 3.3V output, this equates to ±46mV deviation. Using 0.1% resistors reduces total error to ±0.9%, critical for ADC reference or precision analog rails.

Can the MP4462DN-LF-Z operate in dropout mode when input voltage falls near output voltage?

No. As a non-synchronous buck converter, it cannot regulate when VIN ≤ VOUT + V_F(diode). With a typical Schottky forward drop of 0.3V, dropout occurs below VOUT + 0.3V. It lacks LDO-like pass-through capability and will cease regulation and enter undervoltage lockout below ~2.7V VIN.

What thermal derating applies above 25°C ambient?

Using θ_JA = 50°C/W for SOIC8E, power dissipation must be reduced linearly above 25°C: P_D(MAX) = (125°C − T_A) / 50. At 85°C ambient, max continuous power drops to 0.8W - corresponding to ~1.8A at 12V→3.3V conversion. Forced airflow or copper pour improves real-world thermal performance.

Is the EN pin compatible with open-drain microcontroller GPIOs?

Yes. The EN pin has a 1µA internal pull-up and requires only ~1µA sink current to disable. Standard 3.3V or 5V open-drain GPIOs easily meet this requirement. No external pull-down resistor is needed unless active-low logic inversion is desired.

How does frequency foldback improve light-load efficiency?

Below ~200mA load, the MP4462DN-LF-Z reduces switching frequency proportionally to load current, lowering gate-drive and switching losses. This maintains >85% efficiency at 100µA load - versus ~60% for fixed-frequency operation - extending battery life in always-on sensing nodes.