LMQ61480AASQRJRRQ1 - 8A, 36V Automotive Buck | Texas Instruments
MPN： LMQ61480AASQRJRRQ1 ✓ 啟用中LMQ61480AASQRJRRQ1 概覽
A buck converter (step-down regulator) is a switching voltage regulator that converts a higher input voltage to a lower output voltage using a high-side and low-side power stage switched by a PWM control loop. Within the power management IC hierarchy, the LMQ61480-Q1 sits in the family of point-of-load DC/DC converters feeding microcontrollers, SoCs, and ADAS processors from 12 V or 48 V automotive batteries.
Key features include the wide 3 V to 36 V operating input range with transient tolerance up to 42 V, an adjustable output from 1 V to 95% of the input voltage, and pin-selectable light-load mode for efficiency optimization. The device incorporates pin-selectable spread spectrum to reduce EMI peaks, a design intent explicitly stated by TI for the LM6x4xx-Q1 family.
The LMQ61480-Q1 belongs to a pin-compatible 6 A/8 A/10 A automotive family (LM62460-Q1, LM61480-Q1, LM61495-Q1 per the TI datasheet), allowing current-rating changes without PCB respin. Synchronous rectification integrates the power FETs, minimizing external components and improving efficiency at 8 A loads, while internal compensation and protection (current limit, thermal shutdown per family datasheet) simplify design-in.
Typical applications include automotive infotainment SoC rails, ADAS camera and radar power supplies, body electronics and gateway modules stepping 12 V down to 5 V or 3.3 V, and industrial clusters sharing the same 24 V-class rails. The 8 A rating directly supports multi-core processors and FPGA core rails.
Design-wise, keep the switch-node and input capacitor loops tight to exploit the low-EMI layout, and use the pin-selectable spread spectrum when CISPR 25 compliance is required; note the trade-off that forced-PWM or light-load selection affects standby quiescent power.
This page synthesizes distributor availability data, drop-in family alternatives, and design notes beyond what the manufacturer datasheet provides.
直接替換替代品，適用於 LMQ61480AASQRJRRQ1 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LMQ61480AASQRJRRQ1 （相同外形與佔位） — 差異在於 Maximum Output Current, Output Voltage Range, Package, Transient Input Tolerance.
LMQ61460AASQRJRRQ1
✅ 直接替換聯絡詢價
查看資料表 →LMQ61495AASQRJRRQ1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LMQ61440AASQRJRRQ1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM61440AASQRJRRQ1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM61480QRPHRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
LMQ61480AASQRJRRQ1 最大額定值與電氣特性
| 拓撲 | Synchronous Buck (step-down) Converter |
| 輸入電壓範圍 | 3 V to 36 V |
| Transient Input Tolerance | 42 V |
| 最大輸出電流 | 8 A |
| 輸出電壓範圍 | 1 V to 95% of input voltage |
| 輸出類型 | Adjustable or fixed options |
| Light-Load Mode | Pin selectable |
| Spread Spectrum | Pin selectable |
| EMI Optimization | Low-EMI design for automotive (CISPR 25 targeted per TI) |
| Qualification | AEC-Q100 automotive qualified |
| 工作溫度 | -40C to +125C |
| 封裝 | 16-Pin VQFN (RJR) |
| 安裝類型 | Surface Mount |
| Family | LM6x4xx-Q1 pin-compatible 6 A/8 A/10 A buck family |
LMQ61480AASQRJRRQ1 16-pin vqfn (rjr) 腳位配置指南
LMQ61480AASQRJRRQ1（16-pin vqfn (rjr) 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： LMQ61480AASQRJRRQ1.
請參閱 資料表 以查看完整腳位配置。
典型應用
LMQ61480AASQRJRRQ1 適用於 6 應用s: ADAS Domain Controller Power, Automotive Infotainment Rails, Automotive Gateway and Body Electronics, Camera and Radar Sensor Modules, Industrial 24V Bus Point-of-Load, Battery-Powered and Communications Equipment Power.
ADAS Domain Controller Power
ADAS domain controllers and SoC modules need multi-amp core rails derived from the 12 V automotive battery. The LMQ61480AASQRJRRQ1's 8 A output directly powers SoC core or DRAM rails, while its 3 V to 36 V input with 42 V transient tolerance survives automotive load-dump events without front-end clamping. Low-EMI design and pin-selectable spread spectrum help the module meet CISPR 25 emissions requirements near sensitive radar and camera front ends. Placed after a reverse-protection stage, the converter steps 12 V to 5 V or 3.3 V with synchronous efficiency; the AEC-Q100 qualification supports ASIL-relevant supply architectures. Thermal design centers on the exposed pad and via farm under the VQFN (RJR).
推薦
Automotive Infotainment Rails
Infotainment head units combine processors, display drivers, and audio amplifiers on shared 5 V and 3.3 V rails fed from the vehicle battery. The LMQ61480AASQRJRRQ1's 8 A capability covers processor core rails during burst workloads, and its light-load pin-selectable mode preserves efficiency when the unit idles, reducing standby battery drain. The 36 V input and 42 V transient rating tolerate cranking and load-dump conditions on the always-on battery line, while spread spectrum limits radiated emissions into AM/FM tuner bands. Its compact 16-pin VQFN (RJR) footprint suits the dense layouts typical of HMI boards, and the family pin-compatibility lets one layout serve 6 A/8 A/10 A tier variants across trim levels.
推薦
Automotive Gateway and Body Electronics
Gateway modules aggregate CAN/LIN/Ethernet traffic and must supply network PHYs, microcontrollers, and memory from a permanently connected battery line. The LMQ61480AASQRJRRQ1 steps the 12 V rail down efficiently with its 3 V to 36 V input and 8 A rating, covering peak transmission bursts and cold-crank transients up to 42 V. Pin-selectable light-load mode minimizes quiescent draw during vehicle sleep states, a key parameter for key-off battery drain budgets. The low-EMI layout aids EMC compliance in the metal-dense gateway environment, and AEC-Q100 qualification aligns with body-electronics reliability requirements. Output settable from 1 V to 95% of VIN lets one regulator serve 5 V, 3.3 V, and 1.8 V PHY/core rails across the board.
推薦
Camera and Radar Sensor Modules
Automotive camera and radar modules are size-constrained and emissions-sensitive, pairing image sensors or MMICs with compact power stages. The LMQ61480AASQRJRRQ1's low-EMI optimization and pin-selectable spread spectrum directly reduce clock harmonics that degrade radar IF chains and camera imagers. Its 8 A rating, while beyond a single camera's need, supports multi-sensor aggregators and radar domain boards; the compact 16-pin VQFN (RJR) fits module-level PCBs. The 42 V transient tolerance removes the need for bulky front-end TVS sizing on the battery-fed line, and AEC-Q100 qualification plus -40C to +125C operation meet under-hood-adjacent mounting conditions. Efficiency at light load preserves the module thermal budget in sealed enclosures.
推薦
Industrial 24V Bus Point-of-Load
Industrial PLCs, motor-control boards, and drives distribute 24 V and derive 5 V or 3.3 V logic rails locally. The LMQ61480AASQRJRRQ1's 3 V to 36 V input accepts 24 V buses with margin (and 42 V transients common in industrial wiring), while its 8 A output powers FPGA core rails, embedded processors, and multi-PHY Ethernet switches. Synchronous operation maintains high efficiency at full load, easing convection-cooled enclosure design. Though automotive-qualified, AEC-Q100 parts are frequently reused in industrial designs for their robustness margin. Pin-selectable spread spectrum simplifies EN 55011-style conducted emissions compliance, and the 16-pin VQFN (RJR) footprint lets one layout cover 6 A/8 A/10 A product tiers within the same machine platform.
推薦
Battery-Powered and Communications Equipment Power
Battery-backed communications equipment, routers, and 5G small-cell hardware need efficient step-down conversion from 12 V to 48 V-class supplies. The LMQ61480AASQRJRRQ1's 8 A output supports processor and RF power-amplifier rails, its 36 V input tolerates telecom -48 V rectified inputs with transient headroom to 42 V, and pin-selectable light-load mode optimizes efficiency during low-traffic periods, extending battery runtime. Spread spectrum reduces conducted emissions into shared power infrastructure, easing system-level EMC testing. The compact VQFN (RJR) package suits high-density line-card and radio layouts, and the pin-compatible 6 A/8 A/10 A family enables a single PCB to be populated per SKU power tier without redesign, shortening variant qualification cycles.
推薦
推薦產品摘要
工程參考資料，適用於 LMQ61480AASQRJRRQ1 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LMQ61460AASQRJRRQ1 | LMQ61495AASQRJRRQ1 | LMQ61440AASQRJRRQ1 | LM61480QRPHRQ1 |
|---|---|---|---|---|---|
| Package | 16-Pin VQFN (RJR) | 16-Pin VQFN (RJR) - same | 16-Pin VQFN (RJR) - same | 16-Pin VQFN (RJR) - same | 16-Pin VQFN (RPH) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 8 A | 6 A | 10 A | 4 A | 8 A |
| Input Voltage Range | 3 V to 36 V (42 V transient) | 3 V to 36 V (42 V transient) | 3 V to 36 V (42 V transient) | 3 V to 36 V (42 V transient) | 3 V to 36 V |
| AEC-Q100 Qualification | Qualified (automotive -Q1) | Qualified (-Q1) | Qualified (-Q1) | Qualified (-Q1) | Qualified (-Q1) |
| Light-Load / Spread Spectrum | Pin selectable | Pin selectable | Pin selectable | Pin selectable | Pin selectable (family feature) |
| Package Fit / Drop-In | 16-Pin VQFN (RJR) baseline | Drop-in on same footprint | Drop-in on same footprint | Drop-in on same footprint | Verify footprint (RPH code) |
主要差異化特點
- Highest current tier fits mid-range rails (對比LMQ61460AASQRJRRQ1)
- Lower thermal stress than the 10 A family member (對比LMQ61495AASQRJRRQ1)
- Ultra-series density and EMI optimization (對比LM61480QRPHRQ1)
設計說明
The LM6x4xx-Q1 family is designed for low EMI, and its performance depends heavily on layout. Keep the input capacitor-to-PVIN/PGND loop as small as possible, place the BST capacitor close to the device, and route the switch node as a short, narrow island away from sensitive analog traces. Use the exposed pad of the 16-pin VQFN (RJR) with a solid ground plane and a via array for both thermal and EMI performance. Follow the TI LM6x4xx-Q1 datasheet layout section and TI reference designs for a CISPR 25-ready starting point.
Estimated: at 12 V input, 5 V output, 8 A load, and roughly 95% peak synchronous efficiency, dissipation is on the order of 2 W. The actual junction rise depends on board copper; a conservative layout provides at least 2 oz copper with a 1-square-inch ground pour under the exposed pad. For sustained 8 A loads or higher VIN-VOUT deltas, verify junction temperature with the datasheet thermal metrics and consider the thermally enhanced dual-side-cooled LM61480T-Q1 package option for demanding automotive environments.
Do not confuse package codes when sourcing: LMQ61480AASQRJRRQ1 uses the RJR 16-pin VQFN, while LM61480QRPHRQ1 uses the RPH 16-pin VQFN - these are not footprint-identical despite similar specifications. Also set the pin-selectable light-load mode deliberately: forced operation at light load raises standby power, while skipping pulses can increase output ripple in sensitive rails. Confirm the output setting network against the 1 V to 95% of VIN adjustable range and respect the 42 V absolute transient limit - do not treat 42 V as continuous operation.
合規資訊
AEC-Q100 automotive qualification is confirmed by the -Q1 designation and TI product page. RoHS/REACH status should be confirmed on the TI ordering & quality page for the exact ordering part number.
