LMR23630FQDRRRQ1 - 36V 3A Sync Step-Down Converter | TI
MPN: LMR23630FQDRRRQ1 ✓ Hoạt độngLMR23630FQDRRRQ1 Tóm tắt
What is a synchronous buck converter? A buck converter is a switched-mode power supply (SMPS) topology that steps a higher DC input voltage down to a lower regulated DC output by alternately switching an inductor between the input and ground. The 'synchronous' designation means the rectifier diode has been replaced with a second MOSFET to improve efficiency at high output currents. Within the broader power-management hierarchy, a buck converter sits below linear regulators (LDOs) for high-step-down / high-current applications because it dissipates far less power, but introduces switching ripple that must be filtered. The LMR23630-Q1 belongs to TI's SIMPLE SWITCHER family aimed at minimizing external component count.
Key features include 75 uA quiescent current (light load), peak-current-mode control for cycle-by-cycle current limit and simple loop compensation, precision enable pin with hysteresis for power sequencing, internal soft-start to limit inrush current, and thermal shutdown. The 12-pin WSON package exposes the die to a thermal pad with theta_JA of approximately 41 C/W on a standard JEDEC 4-layer board, supporting 3 A continuous output up to +125 C junction.
Architecture depth: the LMR23630-Q1 uses peak current mode control with internal slope compensation, an 80 mV typical current-sense threshold, and a 7 MHz capable error amplifier. The wide 200 kHz to 2.2 MHz RT-programmable switching range lets the designer trade efficiency against passive component size. Internally the high-side FET has 95 mΩ and low-side 70 mΩ typical RDS(on) at 12 V, achieving peak efficiencies above 90 % at 24 V to 5 V/3 A.
When designing with the LMR23630-Q1, choose the inductor so that its ripple current is between 20 % and 40 % of the 3 A output, place the input ceramic bypass within 5 mm of the PVIN pin, and follow the layout recommendations in the manufacturer datasheet. A feedback resistor divider using 1 % parts sets VOUT; the F-variant fixed 400 kHz switching minimizes BOM for noise-sensitive automotive rails.
This page synthesizes distributor pricing, drop-in automotive alternatives from the LMR23610/15/25-Q1 family, and practical layout notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho LMR23630FQDRRRQ1 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
LMR23630QDRRRQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LMR23630FDRRR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LMR23625QDRRRQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LMR23615QDRRRQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LMR23630AFQDDARQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LMR23630FQDRRRQ1 Tỷ lệ tối đa & tính chất điện
| Cấu trúc | Synchronous Buck (Step-Down) |
| Phạm vi điện áp đầu vào | 4 V to 36 V |
| Khoảng điện áp đầu ra | 1 V to 28 V (Adjustable) |
| Continuous Output Current | 3 A |
| Tần số chuyển đổi | 200 kHz to 2.2 MHz (F-variant fixed at 400 kHz) |
| Điện áp yên tĩnh | 75 uA (typ) |
| Control Mode | Peak Current Mode |
| High-Side RDS(on) | 95 mΩ (typ at 12 V) |
| Low-Side RDS(on) | 70 mΩ (typ at 12 V) |
| Khoảng nhiệt độ hoạt động | -40 C to +125 C (Junction) |
| Hộp | 12-WFDFN Exposed Pad (WSON / DRR) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 2 (1 year floor life) |
| Trạng thái RoHS | Compliant |
| AEC-Q100 Qualification | Qualified (Automotive Grade) |
| N Nap kích hoạt | Yes (precision, with hysteresis) |
| Bắt đầu mềm | Internal |
| Tắt nhiệt | Yes |
Cấu hình chân LMR23630FQDRRRQ1
| Chân 1 | PGND — Power ground return for low-side FET |
| Chân 2 | PVIN — Power input supply to high-side FET |
| Chân 3 | PVIN — Power input supply to high-side FET (duplicate) |
| Chân 4 | SW — Switch node - inductor connection |
| Chân 5 | SW — Switch node - inductor connection (duplicate) |
| Chân 6 | BST — Bootstrap supply for high-side gate driver |
| Chân 7 | PGND — Power ground return (duplicate) |
| Chân 8 | AGND — Analog ground reference |
| Chân 9 | FB — Feedback voltage input (VOUT sense, internal 1 V ref) |
| Chân 10 | RT — Resistor timing - sets switching frequency (F variant: NC internally) |
| Chân 11 | EN — Precision enable input with internal pull-up |
| Chân 12 | PGOOD — Power-good open-drain output |
Ứng dụng tiêu biểu
LMR23630FQDRRRQ1 phù hợp cho 6 Áp dụngs: Automotive 12 V Battery Rail Conditioning, Industrial 24 V / 28 V Bus Power Supplies, Portable Battery-Powered Equipment, PLC and Factory Automation I/O, Building Automation and HVAC Control, General-Purpose Point-of-Load (POL) Regulation.
Automotive 12 V Battery Rail Conditioning
The LMR23630FQDRRRQ1 is purpose-built for automotive 12 V battery rail conditioning, accepting 4 V to 36 V input to handle cold-crank (down to 4 V) and load-dump transients (up to 36 V) without damage. Its 3 A continuous output current and 400 kHz fixed switching frequency generate clean 5 V or 3.3 V rails for body electronics, infotainment controllers, and ADAS sensor modules. The internal synchronous FETs achieve >90 % efficiency at 12 V to 5 V / 2 A, eliminating the need for an external Schottky diode and shrinking the BOM versus older non-synchronous buck regulators. AEC-Q100 qualification makes it directly suitable for under-hood and cabin ECUs in production vehicles.
Được đề xuất
Industrial 24 V / 28 V Bus Power Supplies
For industrial 24 V and 28 V bus systems, the LMR23630FQDRRRQ1's 36 V input withstand rating comfortably exceeds the highest expected bus voltage plus transients. The adjustable 1 V to 28 V output range lets a single part serve multiple rail requirements - 24 V pass-through, 12 V intermediate, 3.3 V logic - by changing only the feedback resistor divider. At 24 V to 5 V / 3 A, the synchronous topology sustains ~92 % efficiency, reducing heatsinking needs in sealed industrial enclosures. The 400 kHz fixed switching node makes output LC filter design straightforward and avoids interference with low-frequency industrial sensor bands.
Được đề xuất
Portable Battery-Powered Equipment
In portable and battery-powered applications, the LMR23630FQDRRRQ1's 75 uA quiescent current minimizes standby drain, extending battery life when the load is asleep. Its 4 V minimum input allows operation directly from a single lithium-ion cell (3.0 V to 4.2 V) with a boost front-end or from 2S / 3S alkaline packs. Synchronous rectification eliminates the reverse-recovery losses of a Schottky diode, important at low VIN where every millivolt matters. The 4 mm x 4 mm WSON footprint suits handheld test instruments, portable medical monitors, and field-deployed IoT gateways where PCB real estate is scarce.
Được đề xuất
PLC and Factory Automation I/O
PLC digital-output modules and factory-automation I/O subsystems benefit from the LMR23630FQDRRRQ1's combination of wide input range, 3 A output, and AEC-Q100 robustness. The synchronous topology holds output ripple below 30 mVpp at full load, preventing logic-level glitches on 24 V-to-5V/3.3 V rails that drive optocouplers, RS-485 transceivers, and digital I/O expanders. The internal peak-current-mode control with cycle-by-cycle current limiting protects downstream components from short-circuit events typical of industrial wiring faults. The exposed thermal pad handles sustained 3 A operation in sealed DIN-rail enclosures without external heatsinking.
Được đề xuất
Building Automation and HVAC Control
Building automation controllers and HVAC systems running on 24 VAC rectified DC bus benefit from the LMR23630FQDRRRQ1's 36 V tolerance, which survives rectified 24 VAC peaks of ~34 V plus margin. The 3 A output powers relays, TRIAC drivers, communication modules, and main MCU rails from a single converter. AEC-Q100 qualification provides extra reliability margin for 10+ year installed lifetimes in commercial HVAC equipment. The fixed 400 kHz switching frequency simplifies EMI compliance for FCC Part 15 / EN 55011 conducted emissions in building-automation products.
Được đề xuất
General-Purpose Point-of-Load (POL) Regulation
As a point-of-load (POL) regulator for downstream FPGAs, ASICs, and microcontrollers, the LMR23630FQDRRRQ1 steps a 12 V or 24 V intermediate bus down to a local 1.0 V to 5.0 V core rail. Its 400 kHz switching frequency keeps the output LC filter small, while the synchronous topology preserves >90 % efficiency even at 2-3 A loads typical of SoC rails. The adjustable output range covers nearly all common digital supply voltages without changing the converter, and the precision enable with hysteresis supports sequenced multi-rail power-up demanded by modern processors.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LMR23630FQDRRRQ1 — 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 | LMR23630QDRRRQ1 | LMR23630FDRRR | LMR23625QDRRRQ1 | LMR23615QDRRRQ1 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 12-WSON DRR (4x4 mm) | 12-WSON DRR - same | 12-WSON DRR - same | 12-WSON DRR - same | 12-WSON DRR - same |
| Output Current | 3 A | 3 A | 3 A | 2.5 A | 1.5 A |
| Input Voltage Range | 4 V to 36 V | 4 V to 36 V | 4 V to 36 V | 4 V to 36 V | 4 V to 36 V |
| Switching Frequency | 400 kHz (fixed, F variant) | 200 kHz-2.2 MHz (RT-programmable) | 400 kHz (fixed) | 200 kHz-2.2 MHz (RT-programmable) | 200 kHz-2.2 MHz (RT-programmable) |
| AEC-Q100 Qualification | Yes | Yes | No (commercial grade) | Yes | Yes |
| Quiescent Current | 75 uA | 75 uA | 75 uA | 75 uA | 75 uA |
| Approximate 1k Price (USD) | $1.78 | $1.78 | $1.65 | $1.55 | $1.40 |
Bảo phân biệt quan trọng
- Fixed 400 kHz switching frequency simplifies automotive EMI compliance (vsLMR23630QDRRRQ1)
- AEC-Q100 qualified for automotive deployment (vsLMR23630FDRRR)
- Higher 3 A continuous output current vs lower-tier family members (vsLMR23625QDRRRQ1)
Ghi chú thiết kế
Estimated: For a 24 V to 5 V / 3 A application, the LMR23630FQDRRRQ1 dissipates roughly (24 V - 5 V) * 3 A * (1 - 0.92) = 4.6 W. Use at least 1 square inch of 2 oz inner-plane copper tied to the exposed thermal pad with a 5x5 via array of 0.3 mm holes for the WSON-12 package. Place the input 10 uF X7R ceramic bypass capacitor within 5 mm of the PVIN pin and use a 22 uF output ceramic to minimize ripple. Keep the SW node traces short and surrounded by PGND copper to reduce radiated EMI.
Do not leave the EN pin floating - although it has an internal pull-up, leaving it unconnected can cause undefined startup behavior with unpredictable power sequencing. Tie EN to PVIN through a 100 kΩ resistor for always-on operation, or to a logic-level control signal for sequenced startup. Also, do not exceed the BST-to-SYNC voltage of 6 V - the bootstrap capacitor must be a 0.1 uF X7R ceramic rated for at least 10 V, located within 2 mm of the BST and SW pins.
The 400 kHz fixed switching frequency of the LMR23630FQDRRRQ1 sits in a CISPR 25 automotive EMI band 2 region; shield the SW node with PGND copper pour on both top and inner layers, and use a pi-filter (input ferrite bead + 10 uF / 1 uF ceramics) on the input to pass conducted emissions tests. Adding a small 10 nF bootstrap series resistor on BST can reduce high-frequency ringing that often fails automotive radiated EMI scans. The exposed thermal pad must be soldered completely - any voids raise junction temperature and reduce EMI margin.
Thông tin tuân thủ
AEC-Q100 qualified for automotive applications per TI LMR23630-Q1 product page. RoHS and REACH compliant per TI product specifications. Choose commercial LMR23630FDRRR variant for non-automotive end products to avoid unnecessary AEC-Q100 cost premium.
