LM25010SD/NOPB - 42V, 1A Step-Down Switching Regulator | TI
部品番号: LM25010SD/NOPB ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.85 | $28.50 |
| 100 | $2.51 | $251.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.85 | $1,850.00 |
LM25010SD/NOPB 概要
A buck switching regulator (also called a step-down converter) is a switch-mode DC-DC power converter that produces a lower DC output voltage from a higher DC input voltage. It uses an N-channel MOSFET switch, an inductor, a freewheeling diode, and output capacitance to chop the input waveform and then reconstruct a regulated lower voltage. The LM25010 is a non-synchronous variant, meaning it uses an external Schottky diode rather than a second integrated MOSFET for freewheeling, which keeps cost low and efficiency acceptable in 12V/24V industrial bus systems.
Key features of the LM25010SD/NOPB include an integrated 42V N-Channel buck switch, an intelligent constant on-time control scheme that provides fast transient response, internal soft-start, and a thermally-enhanced 10-pin WSON exposed-pad package that allows direct soldering to a PCB thermal pad for heat spreading. It requires no loop compensation, simplifying design-in compared to peak-current-mode parts. The regulator operates over a -40C to +125C junction temperature range suitable for industrial and automotive environments.
Architecturally, the LM25010 uses a constant on-time (COT) control architecture with adaptive on-time based on VIN. This gives the converter a pseudo-fixed frequency behavior that reduces acoustic noise and produces fast line/load transient response without the need for external compensation components. The high-side N-FET is integrated, while the low-side path uses an external Schottky diode, balancing cost and efficiency.
Typical applications include 12V and 24V industrial bus point-of-load regulation, 48V telecom and distributed-power architectures, automotive infotainment and chassis subsystems, battery-powered equipment, and general-purpose 5V/3.3V/2.5V high-current rails from a wide VIN source. It is well suited to any system that needs an efficient, compact 1A buck solution from a 6V to 42V source.
When designing with this device, attention must be paid to the selection of the external Schottky diode (reverse voltage >= VIN(MAX) and average current >= IOUT), the inductor (sized for the chosen on-time and ripple target), and the input/output ceramic capacitors (X7R dielectric, low ESR). The exposed pad must be soldered to a sufficient copper pour to keep the junction temperature within safe limits at full load. According to TI datasheet SNVS428, the WSON-10 (DPR) package achieves a theta_JA of approximately 40 C/W on a standard 4-layer JEDEC test board.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on any single manufacturer or distributor page, including a verified same-package cross-reference set and a side-by-side parameter table for the most common substitution candidates.
ドロップイン代替品: LM25010SD/NOPB — 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。
クイック比較ツール — 並列比較する代替部品を選択:
LM25010SDX/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM25010-Q1
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM25010SD
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM25010SD/NOPB 最大定格＆電気的特性
| トポロジー | Buck (Step-Down), Non-Synchronous |
| 入力電圧範囲 | 6 V to 42 V |
| 出力電圧範囲 | 2.5 V to 37 V (adjustable) |
| 最大出力電流 | 1 A |
| 出力タイプ | Adjustable |
| 出力数 | 1 |
| 出力構成 | Positive |
| Control Scheme | Constant On-Time (COT) |
| Integrated Switch | 42 V N-Channel Buck MOSFET |
| 同期整流器 | No (external Schottky required) |
| 動作温度範囲 | -40 C to +125 C (junction) |
| パッケージ | 10-pin WSON (DPR) Exposed Pad |
| 実装タイプ | Surface Mount |
| MSLレベル | 2 (1 year) |
| RoHS ステータス | Compliant (Pb-free, NOPB suffix) |
| Lead-Free / Halogen-Free | Yes / Yes |
LM25010SD/NOPB ピン構成
| ピン 1 | BST — Bootstrap capacitor connection for the high-side gate driver |
| ピン 2 | VIN — Input supply voltage (6V to 42V) |
| ピン 3 | EN — Enable input (active-high precision threshold with hysteresis) |
| ピン 4 | RTON — On-time programming resistor to ground |
| ピン 5 | GND — Ground return for the internal control circuitry |
| ピン 6 | FB — Feedback voltage input from the output resistor divider |
| ピン 7 | SS — Soft-start capacitor connection; controls output rise time |
| ピン 8 | PGND — Power ground return for the internal low-side path |
| ピン 9 | SW — Switch node - output of the high-side MOSFET to the external inductor |
| ピン 10 | EP — Exposed thermal pad - must be soldered to PCB ground for thermal dissipation |
主な用途
LM25010SD/NOPB の用途: 6 件s: Industrial 24V Bus Point-of-Load Regulation, Automotive Infotainment and Body Electronics, 48V Telecom and Distributed Power Architectures, Battery-Powered Portable Equipment, General-Purpose 5V/3.3V High-Current Rails, HVAC and Building Automation Controllers.
Industrial 24V Bus Point-of-Load Regulation
The LM25010SD/NOPB is ideal for stepping a 24V industrial bus rail down to 5V, 3.3V, or 2.5V at up to 1A for PLCs, sensor interfaces, and factory-automation controllers. Its 6V to 42V input range tolerates the 24V +/-20% transients common on factory floors, while the integrated 42V N-FET and constant on-time control provide fast line transient response without external compensation. The WSON-10 (DPR) package with exposed pad supports a 1A continuous load at 24V-to-5V with roughly 1W dissipation, well within the package's thermal capability on a 1 square inch copper pour.
おすすめ
Automotive Infotainment and Body Electronics
The LM25010-Q1 variant of this WSON-10 (DPR) part is AEC-Q100 qualified and is well suited to automotive infotainment head units, instrument clusters, and body-electronic modules that operate from a 12V battery rail with load-dump transients up to 35V. The 6V to 42V input range covers cold-crank (down to 6V) and load-dump (up to 42V) events without additional protection. The non-synchronous topology with an external Schottky keeps cost low for high-volume body modules, and the WSON-10 (DPR) footprint allows a compact layout next to MCU power pins.
おすすめ
48V Telecom and Distributed Power Architectures
The LM25010SD/NOPB's 42V maximum input rating accepts a 48V telecom bus after the typical 3V to 5V of front-end protection, making it usable in distributed-power intermediate bus converters. Each downstream node can be a local 5V or 3.3V supply, replacing centralized multi-output converters and reducing distribution losses. The constant on-time control gives a fast response to dynamic loads such as DSPs, FPGAs, and packet processors, and the WSON-10 (DPR) package is small enough to place at the load for optimal point-of-load regulation in dense line cards.
おすすめ
Battery-Powered Portable Equipment
For portable test equipment and battery-powered industrial tools, the LM25010SD/NOPB efficiently steps a multi-cell Li-ion pack (8V to 36V nominal) down to a 5V USB-PD or 3.3V logic rail at up to 1A. The wide VIN range covers the full discharge curve of 6S to 10S Li-ion packs, and the high-side N-FET's 42V rating protects against transient overvoltage at the input. The WSON-10 (DPR) package and small external L/C allow a compact converter footprint, critical for handheld and portable form factors where board area is at a premium.
おすすめ
General-Purpose 5V/3.3V High-Current Rails
The LM25010SD/NOPB is a workhorse for any system that needs a clean 5V or 3.3V rail at 1A from a higher-voltage distribution such as 12V, 15V, or 18V. The constant on-time control loop eliminates the need for compensation network design, allowing fast prototyping and design reuse. The non-synchronous topology with an external Schottky offers a lower BOM cost than fully synchronous converters, making this part popular in cost-sensitive consumer, white-goods, and appliance designs where a wide VIN range is required and efficiency above 90% is acceptable.
おすすめ
HVAC and Building Automation Controllers
The LM25010SD/NOPB operates from the 24V AC-rectified bus commonly found in HVAC and building-automation systems, providing a regulated 5V or 3.3V supply for microcontrollers, sensor interfaces, and communication transceivers. The 42V input withstands rectified 24VAC peaks with margin, and the -40C to +125C junction temperature range covers outdoor and rooftop equipment. The WSON-10 (DPR) package's exposed pad allows direct soldering to the controller's ground pour, simplifying thermal management in sealed enclosures where airflow is limited.
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: LM25010SD/NOPB — 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 | LM25010SDX/NOPB | LM25010-Q1 | LM25010SD |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | WSON-10 (DPR) | WSON-10 (DPR) - same | WSON-10 (DPR) - same | WSON-10 (DPR) - same |
| Input Voltage Range | 6 V to 42 V | 6 V to 42 V | 6 V to 42 V | 6 V to 42 V |
| Output Voltage Range | 2.5 V to 37 V | 2.5 V to 37 V | 2.5 V to 37 V | 2.5 V to 37 V |
| Maximum Output Current | 1 A | 1 A | 1 A | 1 A |
| Topology | Buck, non-synchronous | Buck, non-synchronous | Buck, non-synchronous | Buck, non-synchronous |
| Control Scheme | Constant On-Time | Constant On-Time | Constant On-Time | Constant On-Time |
| AEC-Q100 Qualified | No | No | Yes | No |
| Pb-Free / RoHS | Yes (NOPB) | Yes (NOPB) | Yes | Tin-lead option |
| Reel Quantity | 1000 | 4500 | 1000 | 1000 |
主な差別化要因
- Wide 6V to 42V input range with integrated 42V N-FET （vs LM5010 (synchronous, different package))
- Non-synchronous topology with constant on-time control （vs LM5085 (synchronous, peak current mode))
- AEC-Q100 automotive grade available in same WSON-10 footprint （vs LM25010-Q1)
設計ノート
Estimated: at VIN=24V, VOUT=5V, IOUT=1A, the high-side MOSFET dissipation is (24-5)V * 1A * (VOUT/VIN) ~= 1.0W ignoring switching losses. The WSON-10 (DPR) package has theta_JA of approximately 40 C/W on a 4-layer JEDEC test board per the TI datasheet, so a 1 square inch copper pour keeps the junction temperature rise near 40 C above ambient. For higher-power operation, increase the copper pour area or add thermal vias to inner ground planes.
Place the external Schottky diode, inductor, and input/output ceramic capacitors as close to the SW and PGND pins as possible to minimize parasitic inductance and ringing. The exposed pad (EP) must be soldered to a PCB ground copper pour with multiple thermal vias for heat extraction. Use X7R ceramic capacitors with at least 10V rating on the input and at least 2x VOUT rating on the output for reliable operation across temperature and DC bias.
Do not exceed the 42V absolute maximum input rating, even during transient events - add a TVS clamp or input snubber for load-dump or hot-plug transients above 42V. Select the external Schottky with reverse voltage >= VIN(MAX) and average current rating >= IOUT(MAX) to avoid diode failure. The RTON resistor sets the on-time and therefore the switching frequency; use a 1% resistor and place it close to the RTON pin to avoid noise coupling. Always populate the SS capacitor to control inrush current at startup.
Keep the FB trace short and away from the SW node to avoid noise injection. Use a Kelvin connection from the output capacitor's positive terminal to the top of the feedback divider for best load regulation. Separate the power ground (PGND) and signal ground (GND) at the IC and join them at a single point beneath the exposed pad to avoid ground loops. The BST capacitor should be routed directly between BST and SW with a short, wide trace to avoid high-side gate drive ringing.
コンプライアンス情報
RoHS compliant per /NOPB suffix and TI product page. Not AEC-Q100 qualified in the LM25010SD/NOPB industrial variant; choose LM25010-Q1 for automotive.
