MP4462DN-LF-Z - 3.5A 36V Step-Down Converter | Monolithic Power Systems
MPN： MP4462DN-LF-Z ✓ 啟用中MP4462DN-LF-Z 概覽
A step-down (buck) converter is a switching DC-DC regulator that efficiently steps a higher input voltage down to a lower regulated output voltage by rapidly switching an internal MOSFET and filtering the resulting pulsed waveform through an external LC network. Within the broader power-management hierarchy, buck regulators belong to the switching-converter family, which sits alongside LDOs, charge pumps, and boost converters. Compared with linear regulators, a buck converter achieves far higher efficiency (typically >90%) because the pass element dissipates little average power, but it does introduce switching ripple and requires inductor/capacitor filtering.
Key features of the MP4462DN-LF-Z include a 4.5 V to 36 V wide operating input range (with a 3.8 V minimum undervoltage lockout per the manufacturer datasheet), a fixed 4 MHz switching frequency that enables small inductors and low-EMI footprints, internal soft-start to limit inrush current, and a 120 µA (typ.) quiescent current that suits battery-connected applications. The 8-pin SOIC-8EP package exposes the die thermal pad for direct copper heatsinking, allowing full 3.5 A output at industrial temperatures.
The device uses peak current-mode control, providing cycle-by-cycle current limiting and inherent input-voltage feed-forward. The high-side MOSFET is fully integrated, so only an external inductor, Schottky rectifier or low-side synchronous FET, and feedback divider are required to complete a 3.5 A point-of-load supply. According to the Monolithic Power Systems datasheet, efficiency peaks above 92% in typical 12 V-to-5 V and 12 V-to-3.3 V designs.
Typical applications include 24 V industrial sensor rails, automotive infotainment and body-electronics supplies, distributed 5 V/3.3 V bus converters from 12 V or 24 V backplanes, and battery-powered equipment requiring wide input-range step-down conversion. The 4 MHz switching frequency permits use of a 1 µH to 4.7 µH inductor, ideal for space-constrained boards.
When designing with the MP4462DN-LF-Z, route the feedback trace away from the switching node, place the input ceramic bypass within 2 mm of the IC, and ensure the exposed pad is soldered to a copper area of at least 1 cm² for thermal relief at full 3.5 A current. The output voltage is set from 0.8 V to ~30 V via an external resistor divider; do not exceed the 36 V absolute-maximum input.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 MP4462DN-LF-Z — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MP4462DN-LF-Z （相同外形與佔位） — 差異在於 Control Method, Input Voltage Range, Operating Temperature, Output Voltage Range, Package.
MP4462DN-LF
✅ 直接替換📋 參考替代品（不在目錄中）
MPQ4462DN-LF-Z
✅ 直接替換📋 參考替代品（不在目錄中）
MPQ4462DN-LF-P
✅ 直接替換📋 參考替代品（不在目錄中）
TPS54331DR
✅ 直接替換聯絡詢價
查看資料表 →MP4462DN-LF-Z 最大額定值與電氣特性
| 拓撲 | Step-Down (Buck) Switching Regulator |
| Output Current | 3.5 A |
| 輸入電壓範圍 | 4.5 V to 36 V (3.8 V UVLO minimum per datasheet) |
| 輸出電壓範圍 | 0.8 V to 30 V (adjustable) |
| 切換頻率 | 4 MHz (typ.) |
| Control Method | Current-Mode PWM |
| Internal MOSFET | Integrated high-side high-voltage MOSFET |
| 靜態電流 | 120 µA (operational, typ.) |
| 工作溫度 | -40 °C to +85 °C (industrial) |
| 封裝 | SOIC-8 with Exposed Pad (SOIC-8EP, 3.9 mm body width) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant (LF = lead-free suffix) |
| 軟啟動 | Internal |
| 輸出配置 | Positive, single adjustable output |
| Efficiency (typ.) | >90 % at 12 V input to 5 V/3.3 V output |
MP4462DN-LF-Z 腳位配置
| 腳位 1 | BOOT — Bootstrap capacitor connection for high-side gate driver |
| 腳位 2 | IN — Input voltage supply (4.5 V to 36 V) |
| 腳位 3 | SW — Switch node - connects to external inductor |
| 腳位 4 | GND — Ground return |
| 腳位 5 | FB — Feedback voltage (0.8 V reference) |
| 腳位 6 | COMP — Compensation node for external RC network |
| 腳位 7 | EN — Enable input (active-high) |
| 腳位 8 | NC — Not connected (per datasheet) |
典型應用
MP4462DN-LF-Z 適用於 6 應用s: 24 V Industrial Sensor Power Rails, Automotive Infotainment Power, Distributed 12 V to 5 V/3.3 V POL Conversion, Battery-Powered Equipment and Portable Tools, LED Lighting Drivers and Signage, Solar and Renewable Energy Edge Equipment.
24 V Industrial Sensor Power Rails
The MP4462DN-LF-Z fits 24 V industrial sensor power rails because its 36 V absolute-maximum input exceeds 24 V nominal with substantial margin for inductive transients on factory wiring. Its 3.5 A output supports multiple sensor and actuator loads on a single converter, while 4 MHz switching permits a compact 2.2 µH inductor that fits in dense PLC backplanes. The 4.5 V to 36 V range also handles 24 V ±20% tolerance. Per MPS datasheet efficiency curves, the part achieves >92% efficiency at 24 V input to 5 V output at 1-2 A loads, reducing thermal stress in sealed industrial enclosures.
推薦
Automotive Infotainment Power
The MP4462DN-LF-Z (or its AEC-Q100 sibling MPQ4462DN-LF-Z) suits automotive infotainment systems where 12 V battery rails must power USB charging, audio amplifiers, and display backlights. Its wide 4.5 V to 36 V input range handles load-dump transients up to 35 V (with external TVS protection recommended above 30 V). The 3.5 A output supports multiple downstream rails, and 4 MHz switching keeps the AM-band EMI footprint small. For full AEC-Q100 compliance, choose the MPQ4462DN-LF-Z which shares the identical SOIC-8EP footprint and pinout.
推薦
Distributed 12 V to 5 V/3.3 V POL Conversion
The MP4462DN-LF-Z is ideal for distributed point-of-load conversion from a 12 V or 24 V backplane to local 5 V and 3.3 V rails on telecom, server, or industrial control boards. Its 3.5 A output and 4 MHz switching frequency let designers place a small local converter next to each ASIC, minimizing distribution losses and improving transient response versus centralized conversion. The exposed pad enables direct PCB copper heatsinking, eliminating the need for an external heatsink at 2-3 W typical dissipation.
推薦
Battery-Powered Equipment and Portable Tools
The MP4462DN-LF-Z fits battery-powered equipment including 18-20 V cordless tools, e-bike displays, and portable medical devices because its 120 µA quiescent current extends standby battery life. The 4.5 V to 36 V input accommodates fully charged 5S Li-ion packs (21 V) down to deeply discharged packs while still regulating. The high 4 MHz switching frequency enables use of a small 1 µH inductor, important for hand-held form factors. Soft-start limits inrush current that would otherwise stress battery management circuitry.
推薦
LED Lighting Drivers and Signage
The MP4462DN-LF-Z drives high-brightness LED arrays in architectural lighting, signage, and horticulture fixtures where 24 V or 36 V constant-voltage supplies must be stepped down to LED string voltages (12-30 V). The 3.5 A output drives 100 W LED strings, and the 4 MHz switching keeps ripple current low for flicker-free illumination. The wide input range handles long LED string wiring where back-EMF spikes can exceed nominal supply. Adjustable output via external divider allows per-string current tuning.
推薦
Solar and Renewable Energy Edge Equipment
The MP4462DN-LF-Z suits solar micro-inverter auxiliary rails, PV charge controller housekeeping supplies, and small wind turbine control boards where input voltages can vary widely between 8 V (partially loaded panel) and 36 V (open-circuit at cold temperature). Its 4.5 V to 36 V input tolerates this range without reconfiguration. The 3.5 A output powers gate drivers, microcontrollers, and communication modules in renewable edge equipment. High efficiency at moderate loads reduces self-consumption in off-grid solar deployments.
推薦
推薦產品摘要
工程參考資料，適用於 MP4462DN-LF-Z — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MP4462DN-LF | MPQ4462DN-LF-Z | MPQ4462DN-LF-P | TPS54331DR |
|---|---|---|---|---|---|
| Package | SOIC-8EP | SOIC-8EP - same | SOIC-8EP - same | SOIC-8EP - same | SO PowerPAD (SOIC-8EP) - same |
| Brand | Monolithic Power Systems | Monolithic Power Systems - same | Monolithic Power Systems - same | Monolithic Power Systems - same | Texas Instruments |
| Output Current | 3.5 A | 3.5 A | 3.5 A | 3.5 A | 3 A (-14%) |
| Input Voltage Range | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 3.5 V to 28 V (-22% max) |
| Switching Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 570 kHz (fixed) |
| Automotive Grade (AEC-Q100) | No (industrial) | No | Yes (AEC-Q100 Grade 1) | Yes (AEC-Q100 Grade 1) | No (industrial) |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Quiescent Current (typ.) | 120 µA | 120 µA | 120 µA | 120 µA | 110 µA |
主要差異化特點
- Highest switching frequency in SOIC-8EP buck class at 36 V input (對比TPS54331DR)
- Wide 36 V input matches automotive load-dump envelope (對比TPS54331DR)
- Automotive-qualified sibling on same die and footprint (對比MP4462DN-LF (non-auto))
設計說明
Estimated: at VIN=24 V, VOUT=5 V, IOUT=3.5 A, the MP4462DN-LF-Z dissipates approximately (24-5) × 3.5 × (1-efficiency) W. At 92% efficiency this is ~7.2 W internal loss. The SOIC-8EP package has a theta_JA of approximately 40 °C/W on a 1 oz copper 1 cm² pad. The junction temperature rise is therefore ~288 °C above 25 °C ambient - clearly requiring a larger copper area (>=4 cm²) or forced airflow for sustained 3.5 A operation. Derate to ~2 A or reduce VIN to <=12 V for reliable full-temperature operation on minimal copper.
Place the input ceramic bypass capacitor (>=4.7 µF X7R) within 2 mm of the IN pin and GND. Keep the SW node copper area small to minimize radiated EMI, and route the FB trace away from SW and BOOT traces. Connect the exposed pad to a continuous ground copper pour with at least 9 thermal vias to the opposite plane for heat extraction. Per MPS layout guidelines, a 2-layer board with 1 oz copper can sustain ~2 W continuous dissipation; 4-layer or 2 oz copper is recommended for >2 W operation.
Do not exceed the 36 V absolute-maximum input voltage - load-dump transients on automotive 12 V batteries can spike above 35 V, requiring an external TVS diode (33 V or 36 V clamp) for protection. The BOOT capacitor (typically 100 nF X7R) must be placed within 2 mm of the BOOT and SW pins; insufficient bootstrap capacitance causes high-side gate drive weakness. Do not operate below 4.5 V input with full 3.5 A load, as dropout will degrade regulation. Finally, the FB trace must not cross noisy areas of the PCB or pick up switching noise - use a Kelvin connection to the top of the feedback divider.
合規資訊
Lead-free per -LF suffix; RoHS and REACH compliant per MPS product page. Industrial-grade only (-40 to +85 C). For AEC-Q100 Grade 1, choose the MPQ4462DN-LF-Z variant. Halogen-free status not stated in public datasheet - set to unknown.
