LM46001PWPR - 60V 1A Synchronous Step-Down Converter | TI
部品番号: LM46001PWPR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.13 | $2.13 |
| 10 | $1.95 | $19.50 |
| 100 | $1.72 | $172.00 |
| 500 | $1.48 | $740.00 |
| 1,000 | $1.31 | $1,310.00 |
| 2,500 | $1.18 | $2,950.00 |
LM46001PWPR 概要
A buck (step-down) DC-DC converter is a switching regulator that uses an inductor to transfer energy from input to output at a lower voltage with high efficiency. Unlike linear regulators that dissipate (VIN - VOUT) × IOUT as heat, a buck converter PWM-switches the input and filters the result with an LC network, yielding efficiencies typically above 90 percent. The LM46001 family belongs to TI's SIMPLE SWITCHER portfolio and sits in the broader hierarchy of switching regulators -> DC-DC converters -> power management ICs -> semiconductors.
Key features include 24 µA quiescent current in regulation, high light-load efficiency via DCM and PFM modes, EN55022/CISPR 22 EMI compliance, integrated synchronous rectification, and adjustable switching frequency. A PGOOD flag, enable pin, and internal soft-start complete the feature set. The HTSSOP-16 (PWP) power package has a thermal pad that keeps junction temperature manageable at the 1 A output level.
The device uses peak-current-mode control for simple loop compensation, fast transient response, and cycle-by-cycle current limiting. Its wide 3.5 V to 60 V input range is achieved with internal 65 V tolerant switches, eliminating the need for external protection components in 24 V industrial or 48 V telecom rail systems.
Typical applications include industrial 24 V/48 V rails, automotive infotainment and body electronics, eMMC/SSD POL supplies, battery-powered portable equipment, and HVAC or factory-automation nodes. The 500 kHz default allows compact inductors and ceramic output capacitors.
When designing with this part, select an inductor with saturation current at least 30 percent above the peak switch current and place input ceramic bypass capacitors within 3 mm of the PVIN pins to minimize ringing and EMI.
This page synthesizes distributor pricing as of 2026-10-08, drop-in pin-compatible alternatives from the LM436xx and LM4600x families, and practical design notes not consolidated in the manufacturer datasheet.
ドロップイン代替品: LM46001PWPR — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: LM46001PWPR （同一形状・フットプリント） — 相違点: Package, EMI Compliance, Mounting Type, Output Voltage Range, Light-Load Operation.
クイック比較ツール — 並列比較する代替部品を選択:
LM46002PWPR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM46000PWPR
✅ ドロップイン✓ 在庫あり
$1.24 / 個
データシートを見る →LM43603PWPR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM43602PWPR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM43601PWPR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM43600PWPR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM46001PWPR 最大定格＆電気的特性
| トポロジー | Synchronous Buck (Step-Down) |
| 入力電圧範囲 | 3.5 V to 60 V |
| 出力電圧範囲 | 1 V to approximately 28 V (adjustable) |
| Output Current | 1 A continuous |
| スイッチング周波数 | 200 kHz to 2.2 MHz (500 kHz default) |
| Quiescent Current (Regulation) | 24 µA |
| Control Mode | Peak current mode |
| Light-Load Behavior | DCM and PFM for high efficiency |
| Switching FETs | Integrated high-side and low-side MOSFETs |
| 効率 | >90% typical at moderate loads (per datasheet curves) |
| EMI Compliance | Meets EN55022 / CISPR 22 conducted emissions |
| 動作温度 | -40 °C to +125 °C |
| パッケージ | HTSSOP-16 (PWP), 5.1 mm × 6.6 mm × 1.2 mm, 0.65 mm pitch |
| 実装タイプ | Surface Mount (exposed thermal pad) |
| MSLレベル | 2 (per JEDEC J-STD-020) |
| Lead-Free / RoHS | Yes / Compliant |
| Enable / Soft-Start / PGOOD | Yes / Yes / Yes |
LM46001PWPR ピン構成
| ピン 1 | BST — Bootstrap capacitor for high-side gate drive |
| ピン 2 | VIN — Input supply voltage (3.5 V to 60 V) |
| ピン 3 | VIN — Input supply voltage (3.5 V to 60 V) |
| ピン 4 | EN — Enable input (active high, with internal pull-up) |
| ピン 5 | RT — Frequency-setting resistor to GND |
| ピン 6 | SS — Soft-start programming capacitor |
| ピン 7 | FB — Voltage feedback (to external resistor divider) |
| ピン 8 | COMP — Compensation network node |
| ピン 9 | PGND — Power ground (low-side FET source) |
| ピン 10 | SW — Switch node (external inductor connection) |
| ピン 11 | SW — Switch node (external inductor connection) |
| ピン 12 | PGOOD — Power-good open-drain output |
| ピン 13 | AGND — Analog ground (return for FB and COMP) |
| ピン 14 | PVIN — Power VIN for internal FETs (decouple locally) |
| ピン 15 | PVIN — Power VIN for internal FETs (decouple locally) |
| ピン 16 | PGND — Power ground (low-side FET source) / Thermal pad |
主な用途
LM46001PWPR の用途: 7 件s: 24V Industrial Sensor Rails, Automotive Body Electronics, 48V Telecom / PoE Point-of-Load, eMMC / SSD Storage Power, Battery-Powered Portable Equipment, HVAC & Building Automation, Industrial IoT Gateways.
24V Industrial Sensor Rails
The LM46001PWPR's 3.5 V to 60 V input range lets it connect directly to 24 V factory-automation backplanes without pre-regulation. At VIN = 24 V and VOUT = 5 V at 1 A, the synchronous topology holds efficiency above 90 percent, while 24 µA quiescent current keeps standby power budgets low for PLC analog input modules. The HTSSOP-16 exposed thermal pad simplifies mounting on vertical DIN-rail PCBs where heatsinking is impractical.
おすすめ
Automotive Body Electronics
Automotive 12 V and 24 V battery rails benefit from the LM46001PWPR's wide VIN tolerance that absorbs load-dump transients up to 60 V. Its HTSSOP-16 footprint supports compact body-control modules powering LED drivers, mirror heaters, and sensor clusters. The 500 kHz switching frequency avoids the AM-band, and the part meets EN55022/CISPR 22 EMI limits with a small input filter - critical for body electronics that share wiring with radio receivers.
おすすめ
48V Telecom / PoE Point-of-Load
The LM46001PWPR steps 48 V telecom or PoE inputs down to 5 V or 3.3 V for downstream point-of-load converters in switches, routers, and small-cell base stations. The integrated high-side and low-side MOSFETs reduce BOM count and PCB area, while synchronous rectification eliminates the need for an external Schottky diode. Cycle-by-cycle current limiting and the PGOOD flag support hot-swap and OR-ing topologies common in telecom hardware.
おすすめ
eMMC / SSD Storage Power
Solid-state drives and embedded MMC storage need tightly regulated 3.3 V and 1.8 V rails from a 5 V or 12 V upstream bus. The LM46001PWPR's peak-current-mode control delivers fast transient response for sudden SSD write-load steps, while the 24 µA quiescent current preserves battery life in portable storage devices. Synchronous rectification and 500 kHz switching keep ripple below 30 mV pk-pk, well within eMMC tolerance.
おすすめ
Battery-Powered Portable Equipment
For portable test instruments, eMeters, and handheld industrial scanners powered from 4-cell Li-ion packs, the LM46001PWPR's 24 µA quiescent current extends standby life by an order of magnitude versus older linear regulators. The part operates across the full 6 V to 36 V battery range and switches at 500 kHz to keep magnetics small. DCM/PFM operation at light loads prevents audible inductor whine during idle periods.
おすすめ
HVAC & Building Automation
HVAC controllers and building-automation nodes typically run from 24 VAC rectified rails that swing between 18 V and 36 VDC. The LM46001PWPR operates over this range with margin to spare, providing 5 V and 3.3 V rails for MCUs, sensors, and relay drivers. EN55022/CISPR 22 EMI compliance reduces certification cost for products installed in noise-sensitive commercial environments.
おすすめ
Industrial IoT Gateways
Industrial IoT gateways aggregate sensor data over RS-485, CAN, and Ethernet backbones and frequently run from 24 V supplies. The LM46001PWPR steps the bus voltage down to 5 V and 3.3 V for the gateway MCU, Wi-Fi/BLE module, and Ethernet PHY. Wide VIN tolerance tolerates supply droops during motor inrush, while integrated synchronous MOSFETs keep the design footprint under 100 mm² - important for DIN-rail enclosures.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LM46001PWPR — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LM46002PWPR | LM46000PWPR | LM43603PWPR | LM43602PWPR | LM43601PWPR | LM43600PWPR |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | HTSSOP-16 (PWP) | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same |
| Input Voltage Range | 3.5 V to 60 V | 3.5 V to 60 V | 3.5 V to 60 V | 3.5 V to 36 V | 3.5 V to 36 V | 3.5 V to 36 V | 3.5 V to 36 V |
| Output Current | 1 A | 2 A (+100%) | 0.5 A (-50%) | 3 A (+200%) | 2 A (+100%) | 1 A (same) | 0.5 A (-50%) |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz |
| Quiescent Current | 24 µA | 24 µA | 24 µA | 33 µA | 33 µA | 33 µA | 33 µA |
| Control Mode | Peak current mode | Peak current mode | Peak current mode | Peak current mode | Peak current mode | Peak current mode | Peak current mode |
| EMI Compliance | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 |
主な差別化要因
- Widest input voltage range in the 1 A HTSSOP-16 class （vs LM43601PWPR)
- Pin-compatible current scaling within the same footprint （vs LM46000PWPR / LM46002PWPR)
- Lower quiescent current than the LM436xx family （vs LM43602PWPR)
設計ノート
Place the input ceramic capacitors (X7R, 1 µF or larger) within 3 mm of the PVIN pins and use wide, short traces to minimize switching-node ringing. The exposed thermal pad must be soldered to a copper pour of at least 1 square inch to keep junction temperature within the 125 °C limit at 1 A continuous load.
Estimated: at VIN = 24 V, VOUT = 5 V, IOUT = 1 A, efficiency ≈ 92 percent, internal power dissipation ≈ (VIN - VOUT) × IOUT × (1 - η) ≈ 1.7 W. The HTSSOP-16 (PWP) thermal pad has θJA ≈ 40 °C/W on a standard JEDEC 4-layer board, producing a junction temperature rise of ~68 °C above ambient - acceptable up to about 55 °C ambient. Reduce VIN or improve airflow for hotter environments.
Do not exceed 60 V on VIN, including transients - load-dump events on 24 V automotive rails can reach 35 V steady-state and higher spikes. Add a TVS or input pi-filter if the upstream supply is unregulated. Also, ensure the SS capacitor is present; omitting it produces large inrush currents that can trigger the cycle-by-cycle limit and appear as output voltage sag at startup.
Keep the SW node copper area minimal to reduce EMI and parasitic capacitance. Route the FB trace away from the SW and BST traces, and use a single-point ground connection between AGND and PGND placed near the output capacitor ground return. The TI LM46001 evaluation board layout is a useful reference for two-layer industrial designs.
To meet EN55022/CISPR 22 Class B conducted limits, add a small common-mode choke plus 2.2 µF Y-capacitor at the input. The 500 kHz default switching frequency leaves the AM broadcast band clean; if you adjust frequency above 1 MHz, verify radiated emissions with a near-field probe.
コンプライアンス情報
RoHS and lead-free confirmed per TI product page. Standard LM46001PWPR is not AEC-Q100 qualified - choose LM46001QPWPTQ1 for automotive. Halogen-free status not stated in provided data.
