LM22675MR-5.0/NOPB - 1A, 42V SIMPLE SWITCHER Buck Converter | TI
MPN: LM22675MR-5.0/NOPB ✓ Hoạt độngLM22675MR-5.0/NOPB Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho LM22675MR-5.0/NOPB — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LM22675MR-5.0/NOPB (cùng hình factor và footprint) — khác nhau ở Package, Switching Frequency, Topology.
LM22675MR-ADJ/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM22675MRE-5.0/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM22675MR-5.0
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM22676QMR-5.0/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM22675MR-5.0/NOPB Tỷ lệ tối đa & tính chất điện
| Cấu trúc | Buck (Step-Down) |
| Input Voltage Range (VIN) | 4.5 V to 42 V |
| Output Voltage (VOUT, fixed) | 5 V |
| Continuous Output Current | 1 A |
| Tần số chuyển đổi | 500 kHz (typical, internal) |
| Enable Input | Precision EN with wide hysteresis (programmable UVLO) |
| Bắt đầu mềm | Integrated (SS/TRK pin) |
| Nhiệt độ mối nối hoạt động | -40 °C to +125 °C |
| Hộp | 8-Pin HSOIC (DDA) PowerPAD, 3.90 mm width |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free (NOPB suffix) | Yes |
| Automotive Grade (LM22675-Q1) | AEC-Q100 qualified (separate ordering part) |
Cấu hình chân LM22675MR-5.0/NOPB
| Chân 1 | VIN — Input supply voltage (4.5 V to 42 V) |
| Chân 2 | EN — Precision enable / programmable UVLO input |
| Chân 3 | BOOT — Bootstrap capacitor for high-side gate driver |
| Chân 4 | NC — Not connected (per datasheet) |
| Chân 5 | SW — Switching node — connect to external L and catch diode |
| Chân 6 | GND — Ground return for power and analog |
| Chân 7 | VCC — Internal regulator bypass (4.7 µF ceramic to GND) |
| Chân 8 | SS/TRK — Soft-start / tracking input |
Ứng dụng tiêu biểu
LM22675MR-5.0/NOPB phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM22675MR-5.0/NOPB — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Internal compensation eliminates external COMP network (vsLM22675MR-ADJ/NOPB)
- Same-PCB scalability from 1 A to 3 A without redesign (vsLM22676QMR-5.0/NOPB)
- Wide VIN tolerance protects against industrial transients (vsLM22675MRE-5.0/NOPB)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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).
