LMR38025SDRRR - 80V 2.5A Sync Buck Converter | Texas Instruments
部品番号: LMR38025SDRRR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.55 | $25.50 |
| 100 | $2.18 | $218.00 |
| 500 | $1.85 | $925.00 |
| 1,000 | $1.62 | $1,620.00 |
| 3,000 | $1.42 | $4,260.00 |
LMR38025SDRRR 概要
What is a synchronous buck converter? A synchronous buck (step-down) DC/DC converter is a switching voltage regulator that uses two actively-switched MOSFETs (one high-side, one low-side, replacing the lossy Schottky diode of older designs) to convert a higher DC input voltage into a lower regulated DC output voltage. The LMR38025 belongs to the SIMPLE SWITCHER power-converter family, which sits inside the broader hierarchy: DC/DC converter -> switching regulator -> voltage regulator -> power management IC. Synchronous buck designs are preferred over linear regulators when the input-to-output voltage differential is high, because efficiency approaches 95% rather than dissipating VIN-VOUT as heat.
Key features include an ultra-low 40 uA typical operating quiescent current for light-load efficiency, a power-good flag with built-in filtering and delay to indicate true system status, a high-voltage enable pin supporting either direct Vin connection or precision UVLO via external resistor divider, internal loop compensation, and internal soft-start. The WSON-12 package with exposed pad delivers a low thermal resistance for sustained 2.5 A delivery in industrial ambient conditions.
Architecturally, the LMR38025 uses peak-current-mode control with internal compensation, which simplifies PCB layout by eliminating external compensation components and provides inherent line-rejection and cycle-by-cycle current limiting. The optional spread-spectrum modulation dithers the switching frequency to spread peak EMI energy across a wider band, easing CISPR 25 / FCC Class B compliance in noisy industrial or MHEV/EV environments.
Typical applications include 24 V industrial automation rails, factory sensor and actuator supplies, building automation, battery-powered telecom equipment, mild-hybrid electric vehicle (MHEV) auxiliary subsystems, and any point-of-load requiring regulation from a wide 12 V/24 V/48 V bus down to 3.3 V or 5 V. The 80 V abs-max input also tolerates load-dump transients commonly seen on 24 V truck and industrial buses.
When designing with the LMR38025, ensure the input capacitor handles the RMS ripple current and place it as close as possible to the VIN and PGND pins. The exposed pad must be soldered to a sufficiently large copper pour (>=100 mm^2) to keep junction temperature within the 150 C abs-max rating under worst-case ambient.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement - but are not duplicated in - the manufacturer datasheet, including same-package cross references and AEC-Q100 automotive options for engineers evaluating wide-Vin buck converters.
ドロップイン代替品: LMR38025SDRRR — 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:
LMR38025SDRCR
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LMR38025SDRRR
✅ ドロップイン✓ 在庫あり
$1.42 / 個
データシートを見る →LMR38025-Q1DRRR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LMR38020SDRRR
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LMR38010SDRRR
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LMR38025SDRRR 最大定格＆電気的特性
| トポロジー | Synchronous Buck (Step-Down) |
| 入力電圧範囲 | 4.2 V to 80 V |
| Absolute Maximum Input Voltage | 80 V |
| Continuous Output Current | 2.5 A |
| 出力電圧範囲 | Adjustable (1.0 V to VIN) |
| スイッチング周波数 | 400 kHz (typical, fixed) |
| Spread Spectrum | Yes (optional) |
| Operating Quiescent Current | 40 uA (typical, ultra-low) |
| Control Mode | Peak Current Mode with Internal Compensation |
| Power Good Flag | Yes (with built-in filtering and delay) |
| イネーブルピン | High-Voltage EN with precision UVLO capability |
| Internal Soft-Start | Yes |
| 動作温度範囲 | -40 C to +150 C (junction) |
| パッケージ | 12-WFDFN (WSON) Exposed Pad, DRR suffix, 3 mm x 3 mm |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| Functional Safety | Functional Safety-Capable (documentation available) |
| AEC-Q100 | Not qualified (LMR38025-Q1 variant available) |
LMR38025SDRRR ピン構成
| ピン 1 | VIN — Input supply voltage (4.2V to 80V) |
| ピン 2 | EN — High-voltage enable / precision UVLO input |
| ピン 3 | PGOOD — Power-good open-drain output with filter and delay |
| ピン 4 | RT/SS — Resistor timing / soft-start control |
| ピン 5 | FB — Voltage feedback (to internal 1 V reference) |
| ピン 6 | COMP — Compensation node (internally compensated, do not load) |
| ピン 7 | BST — Bootstrap supply for high-side gate driver |
| ピン 8 | SW — Switch node (high-side and low-side FET midpoint) |
| ピン 9 | PGND — Power ground (return for low-side FET) |
| ピン 10 | PGND — Power ground (second bond for low-side FET) |
| ピン 11 | AGND — Analog ground (return for reference and control) |
| ピン 12 | VCC — Internal LDO output (decouple to AGND) |
主な用途
LMR38025SDRRR の用途: 6 件s: 24 V Industrial Automation Rails, MHEV / EV Auxiliary Subsystems, Building Automation & HVAC Controls, Battery-Powered Industrial Telemetry, Factory Sensor & Actuator Power, 48 V Telecom & PoE Auxiliary Rails.
24 V Industrial Automation Rails
The LMR38025SDRRR's 4.2 V-80 V input range and 2.5 A continuous output make it ideal for 24 V industrial factory-automation rails that must tolerate load-dump transients up to 80 V. Its 40 uA quiescent current preserves efficiency at light loads for sensor nodes that spend most of their life in standby, while the 400 kHz switching frequency keeps the input/output filter passives compact. According to the TI datasheet, the optional spread spectrum eases CISPR 25 / EN 55011 Class B compliance when placed near PLCs, motor drives, or RF receivers. Place the input capacitor close to VIN/PGND and solder the exposed pad to >=100 mm^2 copper pour to keep the junction below 150 C at 85 C ambient and 2.5 A continuous delivery. The internal PGOOD flag provides a clean rail-OK signal to the downstream MCU without an external supervisor.
おすすめ
MHEV / EV Auxiliary Subsystems
The LMR38025SDRRR's 80 V absolute-maximum input and Functional Safety-Capable documentation target MHEV/EV 24 V and 48 V auxiliary subsystems such as body-control modules, lighting drivers, and HVAC blowers. Its synchronous-rectifier topology delivers ~93% peak efficiency at 24 V to 5 V conversion, minimizing heat in sealed automotive enclosures. According to TI, the wide-Vin enable pin supports precise UVLO via an external resistor divider, ensuring clean cold-crank and start-stop behavior. The LMR38025-Q1 variant shares the same die and WSON-12 DRR footprint, giving engineers a path to upgrade to AEC-Q100 grade without re-laying-out the PCB. The internal soft-start limits inrush, and the optional spread spectrum reduces EMI peaks that would otherwise force additional shielding near CAN-FD transceivers.
おすすめ
Building Automation & HVAC Controls
Smart-building devices - thermostats, BACnet controllers, and 24 V HVAC damper actuators - benefit from the LMR38025SDRRR's 4.2 V-80 V input tolerance, which lets a single design accept 12 V AC adapters, 24 V HVAC bus power, and 48 V telecom backup rails. The 40 uA quiescent current is critical for battery-backed smoke detectors and CO2 sensors that must run for years on a single cell while still waking up periodically to drive a higher-current actuator. According to TI's datasheet, internal compensation eliminates the external RC network that designers would otherwise have to tune per output voltage, accelerating time-to-market for multi-rail building-automation products. PGOOD output feeds the MCU to indicate rail stability before initiating wireless commissioning.
おすすめ
Battery-Powered Industrial Telemetry
Remote industrial telemetry nodes powered by 24 V lead-acid or lithium battery banks need a buck converter that survives input transients while sipping minimal quiescent current during long sleep intervals. The LMR38025SDRRR's 40 uA Iq is roughly 5-10x lower than comparable 80 V buck parts, extending battery life for solar-powered oil-pad SCADA, water-treatment monitoring, and asset-tracking devices. According to TI's datasheet, the device operates down to 4.2 V input, allowing direct regulation from a 6 V SLA battery near end-of-discharge without an additional boost stage. The synchronous topology delivers ~92% efficiency at 24 V to 3.3 V / 500 mA loads typical for cellular IoT modems. Spread spectrum reduces conducted emissions that could interfere with sub-GHz radio receivers sharing the same enclosure.
おすすめ
Factory Sensor & Actuator Power
Class-1 industrial proximity sensors, 24 V solenoid actuators, and 4-20 mA loop-powered transmitters benefit from the LMR38025SDRRR's wide Vin and 2.5 A peak capability. The synchronous buck converts 24 V industrial bus down to 5 V or 3.3 V for sensor signal-conditioning ASICs, microcontrollers, and RS-485 transceivers. According to TI, the internal peak-current-mode control with cycle-by-cycle current limiting provides inherent short-circuit protection - critical for outdoor installations where cable damage can ground the output. The HTSSOP-compatible WSON-12 DRR footprint is footprint-compatible with TI's wide-Vin buck family, allowing PCB reuse across 1 A (LMR38010), 2 A (LMR38020), and 2.5 A (LMR38025) variants on the same hardware platform.
おすすめ
48 V Telecom & PoE Auxiliary Rails
Telecom rectifier outputs (typically 48 V nominal, 60 V peak during equalize charge) and PoE+ powered-device applications can use the LMR38025SDRRR as a downstream buck from a higher-voltage front-end converter, or directly from 48 V with proper input protection. Its 80 V abs-max Vin tolerates the 60 V telecom equalize-charge transient plus margin, while 2.5 A supports downstream PoE+ signature and housekeeping loads. According to TI's datasheet, the synchronous topology at 400 kHz minimizes switching losses at 48 V to 5 V / 2.5 A conversion typical of small-cell base stations and 5G pico-cell radios. Internal soft-start and PGOOD simplify hot-swap and OR-ing sequencing when the converter is paralleled for redundancy.
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: LMR38025SDRRR — 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 | LMR38025SDRCR | LMR38025-Q1DRRR | LMR38020SDRRR | LMR38010SDRRR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 12-WFDFN Exposed Pad (WSON DRR) | 12-WFDFN Exposed Pad (WSON DRR) - same | 12-WFDFN Exposed Pad (WSON DRR) - same | 12-WFDFN Exposed Pad (WSON DRR) - same | 12-WFDFN Exposed Pad (WSON DRR) - same |
| Input Voltage Range | 4.2 V to 80 V | 4.2 V to 80 V | 4.2 V to 80 V | 4.2 V to 80 V | 4.2 V to 80 V |
| Continuous Output Current | 2.5 A | 2.5 A | 2.5 A | 2.0 A (-20%) | 1.0 A (-60%) |
| Switching Frequency | 400 kHz | 400 kHz | 400 kHz | 400 kHz | 400 kHz |
| Quiescent Current | 40 uA (typical) | 40 uA | 40 uA | 40 uA | 40 uA |
| Spread Spectrum | Yes (optional) | Yes | Yes | Yes | Yes |
| Power Good | Yes | Yes | Yes | Yes | Yes |
| AEC-Q100 | Not qualified | Not qualified | Yes (qualified) | Not qualified | Not qualified |
主な差別化要因
- 80 V absolute-maximum input range for 24 V industrial and MHEV/EV load-dump tolerance （vs TPS54360 (60 V max))
- Ultra-low 40 uA quiescent current for battery-powered industrial telemetry （vs LMR16030 (65 uA typical Iq))
- WSON-12 DRR package shared with LMR38010/LMR38020 family for scalable platform design （vs TPS54360 (HTSSOP-14))
- AEC-Q100 qualified drop-in via LMR38025-Q1 family member （vs LMR16030 (no -Q1 option))
設計ノート
Estimated: at VIN=24 V, VOUT=5 V, IOUT=2.5 A continuous, synchronous-rectifier efficiency is ~92%, so internal dissipation is roughly (VIN-VOUT)*IOUT*(1-eff) = 19*2.5*0.08 ~= 3.8 W. The WSON-12 DRR package with exposed pad has theta_JA around 40 C/W on a 100 mm^2 4-layer 1-oz copper pour, giving a junction-to-ambient rise of ~150 C at 85 C ambient - at the abs-max. For sustained 2.5 A delivery, expand the copper pour to >=250 mm^2 (theta_JA ~25 C/W) or reduce ambient temperature, or accept that the LMR38020 (2.0 A) is a safer choice for fully sealed industrial enclosures.
Place the input ceramic capacitor (>=4.7 uF X7R 100 V) within 2 mm of the VIN and PGND pins to minimize high-frequency switching loop area. Use a single ground plane split under the IC: PGND pour under the SW node and low-side FET, AGND island under FB and COMP. Stitch the two regions together at a single point near the AGND pin. The exposed thermal pad must be soldered to a continuous copper pour with at least 6 thermal vias (0.3 mm drill) to the bottom layer for heat extraction. According to the TI LMR38025 datasheet layout guidelines, the SW node copper area should be minimized to reduce radiated EMI.
Do not exceed 80 V on VIN even during transients - add a TVS clamp (e.g., SMBJ85A) and bulk capacitance if the upstream source can surge. Do not omit the bootstrap capacitor (>=0.1 uF X7R 25 V) between BST and SW - the high-side gate driver will fail to turn on fully without it. Do not load the COMP pin - the LMR38025 is internally compensated, and external compensation networks will destabilize the loop. For applications needing precise UVLO, replace the direct VIN-to-EN connection with a resistor divider; the high-voltage EN pin supports both connection methods. Finally, when disabling the converter via EN, allow the soft-start capacitor (RT/SS pin) to discharge fully before re-enabling to avoid partial-startup glitches.
The LMR38025 includes optional spread-spectrum frequency modulation that dithers the 400 kHz switching frequency by typically +/-10%, spreading harmonic energy across a wider band and reducing peak EMI by 5-10 dB. According to TI's datasheet, spread spectrum is factory-enable to turn on by default; disable it only if a downstream system is sensitive to frequency modulation. For additional CISPR 25 / FCC Class B margin, add a small input pi-filter (1 uF X7R || ferrite bead || 1 uF X7R) and minimize the SW-node copper loop. Place the input capacitor's ground return directly to the PGND pin, not the chassis ground, to avoid common-mode coupling through the chassis.
コンプライアンス情報
RoHS and REACH compliant per TI product page. The standard LMR38025SDRRR is not AEC-Q100 qualified - choose LMR38025-Q1DRRR for automotive applications. Functional Safety-Capable: documentation available to aid functional safety system design per TI datasheet. Pb-free reflow profile per JEDEC J-STD-020.
