LM22675MR-5.0/NOPB - 1A, 42V SIMPLE SWITCHER Buck Converter | TI
부품 번호: LM22675MR-5.0/NOPB ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.62 | $3.62 |
| 10 | $3.18 | $31.80 |
| 100 | $2.52 | $252.00 |
| 500 | $2.15 | $1,075.00 |
| 1,000 | $1.84 | $1,840.00 |
LM22675MR-5.0/NOPB 개요
A buck (step-down) switching regulator is a type of DC-DC converter that uses an internal MOSFET switch, an external inductor, and a control loop to convert a higher DC input voltage into a lower DC output voltage with high efficiency. It belongs to the hierarchy: buck converter → DC-DC converter → power management IC → semiconductor. Unlike linear regulators, switching bucks do not dissipate VIN-VOUT as heat, so they deliver high efficiency (often >85%) across a wide VIN range, making them the standard choice for converting industrial 24 V rails, automotive 12 V battery rails, or other high-voltage buses down to logic-level voltages.
Key specifications include 1 A continuous output current, 4.5 V to 42 V wide VIN range, internal 500 kHz switching frequency (set by an internal oscillator, no external RT needed on the fixed Voutout parts), integrated soft-start, precision enable pin with wide hysteresis for adjustable UVLO, and current-mode control for line/load transient performance. The HSOIC-8 (DDA) PowerPAD package provides a low thermal resistance path that lets the part deliver full 1 A output across the full -40 °C to +125 °C operating junction-temperature range.
The regulator uses peak current-mode control with internal compensation on the fixed-output versions, a wide-bandwidth error amplifier, and an integrated 150 mΩ high-side N-channel MOSFET. The precision enable input doubles as a programmable under-voltage-lockout threshold, and the SS/TRK pin provides a controlled monotonic startup that limits inrush current from large output capacitors. Combined with internal cycle-by-cycle current limit and thermal shutdown, the architecture is engineered for fault-tolerant industrial and automotive environments.
Typical applications include 24 V industrial sensor and PLC power rails, automotive infotainment and body electronics (the -Q1 variant), 48 V telecom point-of-load conversion, point-of-load regulation after a front-end isolated supply, and battery-powered systems that need a tightly regulated 5 V rail from a varying battery voltage.
When designing with the LM22675MR-5.0/NOPB, follow the datasheet's recommended inductor (4.7 µH to 10 µH, low DCR), input/output ceramic capacitor (≥4.7 µF X7R with low ESR), and bootstrap capacitor (≥0.1 µF) values. Keep the high-di/dt switching loops short and stitch the exposed PowerPAD to a large ground copper pour to keep θJA within the datasheet-recommended 30 °C/W board condition.
This page synthesizes distributor pricing, drop-in cross-brand alternatives, and practical design notes that go beyond the manufacturer datasheet — including a side-by-side comparison against same-brand and competing 42 V / 1 A buck ICs and PCB layout pitfalls specific to the HSOIC-8 PowerPAD footprint.
드롭인 대체품: LM22675MR-5.0/NOPB — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LM22675MR-5.0/NOPB (동일 폼 팩터 및 풋프린트) — 차이점: Package, Switching Frequency, Topology.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LM22675MR-ADJ/NOPB
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM22675MRE-5.0/NOPB
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM22675MR-5.0
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM22676QMR-5.0/NOPB
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM22675MR-5.0/NOPB 최대 정격 & 전기적 특성
| 토폴로지 | Buck (Step-Down) |
| Input Voltage Range (VIN) | 4.5 V to 42 V |
| Output Voltage (VOUT, fixed) | 5 V |
| Continuous Output Current | 1 A |
| 스위칭 주파수 | 500 kHz (typical, internal) |
| Enable Input | Precision EN with wide hysteresis (programmable UVLO) |
| 소프트 스타트 | Integrated (SS/TRK pin) |
| 동작 접합 온도 | -40 °C to +125 °C |
| 패키지 | 8-Pin HSOIC (DDA) PowerPAD, 3.90 mm width |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| Lead-Free (NOPB suffix) | Yes |
| Automotive Grade (LM22675-Q1) | AEC-Q100 qualified (separate ordering part) |
LM22675MR-5.0/NOPB 핀 구성
| 핀 1 | VIN — Input supply voltage (4.5 V to 42 V) |
| 핀 2 | EN — Precision enable / programmable UVLO input |
| 핀 3 | BOOT — Bootstrap capacitor for high-side gate driver |
| 핀 4 | NC — Not connected (per datasheet) |
| 핀 5 | SW — Switching node — connect to external L and catch diode |
| 핀 6 | GND — Ground return for power and analog |
| 핀 7 | VCC — Internal regulator bypass (4.7 µF ceramic to GND) |
| 핀 8 | SS/TRK — Soft-start / tracking input |
일반적인 애플리케이션
LM22675MR-5.0/NOPB 적합 용도: 6 애플리케이션s: Industrial 24 V Sensor Power, Automotive 12 V Body Electronics, Telecom 36 V to 48 V Point-of-Load, Battery-Powered Portable Devices, Point-of-Load After Isolated Front-End, Test & Measurement Instrumentation.
Industrial 24 V Sensor Power
The LM22675MR-5.0/NOPB's 4.5 V to 42 V VIN range directly accepts a nominal 24 V industrial bus with ±20 % tolerance, eliminating the need for a front-end pre-regulator on PLC sensor cards. The fixed 5 V output at 1 A continuous powers multiple 5 V sensors, ADCs, or a small PLC subsystem from one IC. With integrated soft-start on the SS/TRK pin, hot-plug events produce monotonic startup that limits inrush on large output capacitors, and the precision EN pin doubles as programmable UVLO — set with two resistors to ignore 24 V bus brownouts below the operating threshold.
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Automotive 12 V Body Electronics
Although the LM22675MR-5.0/NOPB itself is commercial grade, the pin-compatible LM22675-Q1 AEC-Q100 variant (HSOIC-8 PowerPAD) lets the same PCB layout serve automotive body-electronics loads like HVAC actuators, lighting controllers, and BCM auxiliaries. The 42 V VIN survives 24 V jump-start transients common in 12 V automotive buses, and 1 A continuous output comfortably drives small relay coils and LED strings. The precision enable with wide hysteresis supports clean cold-crank behavior down to 4.5 V VIN without false UVLO tripping.
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Telecom 36 V to 48 V Point-of-Load
The LM22675MR-5.0/NOPB's 42 V maximum withstand lets it sit directly on a 36 V or 48 V telecom bus (within rated margin) and produce a local 5 V rail for housekeeping logic, fan controllers, or low-current ASIC supplies inside a shelf or line card. The 500 kHz switching frequency keeps the output filter small (a single 4.7 µH inductor and 22 µF ceramic), and the HSOIC-8 PowerPAD footprint allows tight placement near the load for minimal distribution losses. For full 48 V compliance in telecom, verify transient surge specs against the LM22675 datasheet absolute maximum.
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Battery-Powered Portable Devices
The LM22675MR-5.0/NOPB efficiently converts a varying battery voltage into a regulated 5 V rail for USB-charging circuitry, small motor drivers, or low-power MCUs in portable designs. The 4.5 V to 42 V input easily spans single-cell Li-ion (3.0 V to 4.2 V) all the way up to multi-cell battery packs, and the 1 A continuous output can sustain peak USB charging currents. The internal soft-start and precision EN enable controlled power-up sequencing — important for designs where the MCU must boot before the high-current load is enabled.
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Point-of-Load After Isolated Front-End
In multi-stage power architectures where an isolated AC-DC or DC-DC front-end provides 12 V, 24 V, or 48 V intermediate bus, the LM22675MR-5.0/NOPB serves as a non-isolated point-of-load (POL) regulator producing a clean 5 V local rail for analog signal-chain ICs. The fixed 5 V version simplifies the BOM by eliminating feedback resistors, and the internal compensation on the fixed-output variant eliminates the external compensation network required by many competitors. Place the buck near the load with the exposed PowerPAD soldered to a generous ground copper pour for lowest θJA.
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Test & Measurement Instrumentation
Bench-top and rack-mount test equipment often uses a 24 V or 36 V internal bus and requires multiple regulated rails including 5 V for logic, MCUs, displays, and analog front-ends. The LM22675MR-5.0/NOPB provides a clean, low-ripple 5 V at 1 A from this intermediate bus with minimal heatsinking requirements thanks to high-efficiency switching topology. The integrated enable supports sequencing with downstream rails, and the small HSOIC-8 PowerPAD footprint fits easily on densely populated instrument mainboards alongside the high-speed ADC and FPGA signal-path components.
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추천 제품 요약
엔지니어링 참조 데이터: LM22675MR-5.0/NOPB — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LM22675MR-ADJ/NOPB | LM22675MRE-5.0/NOPB | LM22675MR-5.0 | LM22676QMR-5.0/NOPB |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments (non-RoHS) | Texas Instruments (AEC-Q100) |
| Package | HSOIC-8 (DDA) PowerPAD | HSOIC-8 (DDA) PowerPAD — same | HSOIC-8 (DDA) PowerPAD — same | HSOIC-8 (DDA) PowerPAD — same | HSOIC-8 (DDA) PowerPAD — same |
| Input Voltage Range | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V |
| Output Voltage | 5 V fixed | Adjustable (~1.285 V to ~VIN) | 5 V fixed | 5 V fixed (leaded) | 5 V fixed |
| Output Current | 1 A | 1 A | 1 A | 1 A | 3 A (+200%) |
| Switching Frequency | 500 kHz | 500 kHz | 500 kHz | 500 kHz | 500 kHz |
| Automotive Grade (AEC-Q100) | No (commercial Grade) | No | No | No | Yes |
| RoHS / Lead-Free | Yes (NOPB suffix) | Yes | Yes | No (legacy/leaded) | Yes |
주요 차별점
- Internal compensation eliminates external COMP network (vs LM22675MR-ADJ/NOPB)
- Same-PCB scalability from 1 A to 3 A without redesign (vs LM22676QMR-5.0/NOPB)
- Wide VIN tolerance protects against industrial transients (vs LM22675MRE-5.0/NOPB)
설계 노트
Estimated: minimize the high-di/dt switching loop area by placing the input ceramic capacitor, the catch diode (or low-side switch on synchronous versions), and the SW-pin-side inductor return path within a few millimeters of the IC. The exposed PowerPAD must be soldered to a ground plane with multiple thermal vias (typically 5-9 vias in a 3x3 grid, 0.3 mm drill) to keep θJA at the datasheet's 30 °C/W reference board value. A continuous ground pour on layer 2 directly under the IC further reduces thermal resistance.
Estimated: at full 1 A load from a 24 V industrial rail to 5 V output, the part dissipates roughly (24 − 5) × 1 × (1 − η)/η. With ~90 % efficiency this is about 2.1 W — well within the HSOIC-8 PowerPAD's capability on the standard 4-layer JEDEC test board. For continuous 24 V to 5 V at 1 A across the full -40 °C to +125 °C junction range, maintain a PowerPAD copper pour of at least 1 square inch and provide ≥4.7 µF X7R 50 V input capacitance close to VIN.
Do not omit the BOOT capacitor — without ≥0.1 µF between BOOT and SW, the high-side N-channel MOSFET will not turn on and the regulator will fail to switch, producing 0 V output with high quiescent current. Do not exceed VIN absolute maximum of 42 V (50 V absolute max is on the datasheet — stay under 42 V continuous for margin). Do not load the 5 V fixed output above 1 A continuous; the LM22676 family (e.g., LM22676QMR-5.0/NOPB, 3 A) is required for higher current. Use an X7R₂₂µF or larger output capacitor and a 4.7 µH to 10 µH shielded inductor with low DCR (≤30 mΩ) for best efficiency.
Estimated: keep analog ground (EN, SS/TRK, VCC bypass return) and power ground (VIN, SW return) connected at a single point under the IC's exposed pad — a star-ground arrangement prevents switching noise from injecting into sensitive feedback and enable pins. Route the SS/TRK trace away from the SW node and inductor to avoid capacitive coupling that would disrupt the soft-start ramp. Place the BOOT capacitor return trace directly to the SW pin side of the inductor, not to a distant ground point, to minimize parasitic inductance in the high-side gate-drive loop.
규정 준수 정보
NOPB suffix confirms RoHS-compliant lead-free termination. The non-NOPB variant (LM22675MR-5.0) is not RoHS. AEC-Q100 qualified versions are sold as LM22675-Q1 (separate ordering part numbers).
