LM26480SQ-AA/NOPB - Dual Buck + Dual LDO PMIC | Texas Instruments
MPN: LM26480SQ-AA/NOPB ✓ Hoạt độngLM26480SQ-AA/NOPB Tóm tắt
A Power Management IC (PMIC) is an integrated circuit that consolidates multiple voltage regulation functions into a single silicon die, replacing what would otherwise require several separate buck converters, LDOs, and sequencer ICs. PMICs sit at the top of the power tree hierarchy and serve as the central authority for rail generation, sequencing, and protection in a system. The LM26480 belongs to the multi-rail PMIC category, combining switching (high efficiency at large step-down ratios) with linear (low-noise post-regulation) topologies in one package.
Key features include 2 MHz switching frequency (enabling small 1 µH inductors and minimal EMI footprint), individual enable inputs for each rail, dedicated power-good outputs for sequencing, automatic PWM/PFM light-load mode for high efficiency at low load currents, and integrated soft-start on every rail. The two synchronous buck converters deliver up to 1.5 A each with internal MOSFETs, while the two LDOs provide up to 300 mA of clean post-regulation for analog or RF rails. Thermal shutdown and current-limit protection are included on every output.
The architecture pairs synchronous rectification buck stages with low-dropout linear post-regulators, allowing the system designer to combine high-efficiency conversion with low-noise analog supply generation. The 2 MHz switching frequency stays above the AM band, easing EMI filter design, while the exposed-pad package provides a low thermal resistance path to the PCB for dissipating combined regulator losses. According to the manufacturer datasheet, the part is qualified for -40 °C to +85 °C operation.
Typical applications include portable media players, digital cameras, GPS/navigation handhelds, infotainment head units, and any battery-powered or USB-powered product that needs multiple regulated rails from a single Li-ion or 5 V source. The small 4x4 mm WQFN footprint suits smartphone-sized PCBs where area is at a premium.
When designing with the LM26480SQ-AA/NOPB, ensure the input supply decoupling network (typically 1 µF + 10 µF ceramic) is close to the VIN pin, and route the AGND/DGND star-ground connection directly under the exposed pad. The PG/EN pins can be left floating if sequencing is not required.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho LM26480SQ-AA/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 LM26480SQ-AA/NOPB (cùng hình factor và footprint) — khác nhau ở Package, Topology, Number of Outputs, RoHS Status, Switching Frequency.
LM26480SQ-BF/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM26480QSQ-AA/NOPB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM26480SQX-AA/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM26480SQ-AA
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM26480SQ-BF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM26480SQ-AA/NOPB Tỷ lệ tối đa & tính chất điện
| Cấu trúc | Step-Down (Buck) Synchronous x2, Linear (LDO) x2 |
| Số lượng đầu ra | 4 |
| Phạm vi điện áp đầu vào | 2.8 V to 5.5 V |
| Buck Output Current | 1.5 A per channel (2 channels) |
| LDO Output Current | 300 mA per channel (2 channels) |
| Tần số chuyển đổi | 2 MHz |
| Output Voltage Range (Buck) | 1.0 V to 3.3 V |
| Hộp | 24-pin WQFN (4x4 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 °C to +85 °C |
| Enable Pins | Individual per rail (4x) |
| Power-Good Pins | Individual per rail (4x) |
| Light-Load Mode | Automatic PWM/PFM |
| Bắt đầu mềm | Integrated on all rails |
| Trạng thái RoHS | Compliant (Pb-Free) |
Cấu hình chân LM26480SQ-AA/NOPB
| Chân 1 | VIN1 — Buck 1 input supply |
| Chân 2 | EN1 — Buck 1 enable (active high) |
| Chân 3 | PGND1 — Buck 1 power ground |
| Chân 4 | SW1 — Buck 1 switching node |
| Chân 5 | BST1 — Buck 1 bootstrap for high-side gate |
| Chân 6 | FB1 — Buck 1 feedback / Vout set |
| Chân 7 | AGND — Analog ground (star to PGND) |
| Chân 8 | PB1 — Buck 1 power-good output |
| Chân 9 | VIN2 — Buck 2 input supply |
| Chân 10 | EN2 — Buck 2 enable (active high) |
| Chân 11 | PGND2 — Buck 2 power ground |
| Chân 12 | SW2 — Buck 2 switching node |
| Chân 13 | BST2 — Buck 2 bootstrap for high-side gate |
| Chân 14 | FB2 — Buck 2 feedback / Vout set |
| Chân 15 | VREF — Internal reference bypass |
| Chân 16 | PB2 — Buck 2 power-good output |
| Chân 17 | EN3 — LDO 1 enable |
| Chân 18 | INLDO1 — LDO 1 input supply |
| Chân 19 | OUTLDO1 — LDO 1 output |
| Chân 20 | EN4 — LDO 2 enable |
| Chân 21 | INLDO2 — LDO 2 input supply |
| Chân 22 | OUTLDO2 — LDO 2 output |
| Chân 23 | PB3/PB4 — LDO power-good outputs (shared) |
| Chân 24 | EP — Exposed thermal pad - ground |
Ứng dụng tiêu biểu
LM26480SQ-AA/NOPB phù hợp cho 6 Áp dụngs: Portable Media Player Power, Digital Camera Power Management, GPS / Navigation Handheld Devices, Automotive Infotainment Head Unit, USB-Powered Embedded System, Industrial Handheld Terminal.
Portable Media Player Power
The LM26480SQ-AA/NOPB is well suited to portable media player designs where a single Li-ion cell (2.8 V to 4.2 V) must generate a 1.0 V to 1.2 V core rail, a 1.8 V DDR/IO rail, and 2.8 V/3.3 V analog rails. The two integrated 1.5 A synchronous bucks handle the high-current core and memory rails, while the 300 mA LDOs supply the audio codec and ADC with low-noise post-regulation. The 4x4 mm WQFN footprint saves roughly 80 mm² versus four discrete regulators, enabling the slim form factor these products require.
Được đề xuất
Digital Camera Power Management
Digital still cameras need simultaneous rails for the image processor (typically 1.0 V to 1.2 V at >1 A), memory (1.8 V), sensor I/O (2.8 V), and lens actuator (3.3 V). The LM26480SQ-AA/NOPB provides exactly this four-rail topology in a single IC, with individual enable pins that sequence the rails in the correct order at power-up. The 2 MHz switching frequency stays above the AM band and well below the sensor pixel-clock harmonics, minimizing EMI-induced image artifacts.
Được đề xuất
GPS / Navigation Handheld Devices
Handheld GPS receivers need clean power for the RF front-end (low-noise LDO rail) plus higher-current rails for the baseband processor and memory. The LM26480SQ-AA/NOPB's combination of two low-ripple LDOs for the RF LNA and SAW filter supply, and two efficient bucks for the baseband, is an ideal match. The exposed-pad WQFN package provides good thermal dissipation even at high ambient temperatures inside a sealed handheld enclosure.
Được đề xuất
Automotive Infotainment Head Unit
Automotive infotainment systems running from a 5 V USB or accessory rail can use the LM26480SQ-AA/NOPB to generate all internal processor and memory rails. The 2.8 V to 5.5 V input range tolerates crank-start transients on the 5 V rail. While the part itself is not AEC-Q100 qualified, it is widely used in non-safety-critical audio head-unit sub-boards where its four-rail density is more valuable than full automotive certification.
Được đề xuất
USB-Powered Embedded System
USB-powered devices receive a regulated 5 V from the upstream port and need to derive 3.3 V, 1.8 V, and 1.0 V rails for the processor, memory, and FPGA/ASIC. The LM26480SQ-AA/NOPB accepts 5 V input directly and generates all three lower voltages plus a fourth rail for housekeeping. The individual power-good outputs feed back to the host MCU or FPGA for clean sequencing at USB enumeration.
Được đề xuất
Industrial Handheld Terminal
Industrial barcode scanners and handheld terminals run from 3.6 V Li-ion packs and need multiple regulated rails for the display, Wi-Fi/Bluetooth module, and barcode imager. The LM26480SQ-AA/NOPB's 2.8 V to 5.5 V input range covers the full Li-ion discharge curve, while its automatic PWM/PFM light-load mode extends runtime by maintaining >85% efficiency even at the millamp-level idle currents typical of these products between scans.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM26480SQ-AA/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 | LM26480SQ-BF/NOPB | LM26480QSQ-AA/NOPB | LM26480SQX-AA/NOPB | LM26480SQ-AA | LM26480SQ-BF |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | WQFN-24 (RTW) 4x4 mm | WQFN-24 (RTW) 4x4 mm - same | WQFN-24 (RTW) 4x4 mm - same | WQFN-24 (RTW) 4x4 mm - same | WQFN-24 (RTW) 4x4 mm - same | WQFN-24 (RTW) 4x4 mm - same |
| Topology | 2x Buck + 2x LDO | 2x Buck + 2x LDO | 2x Buck + 2x LDO | 2x Buck + 2x LDO | 2x Buck + 2x LDO | 2x Buck + 2x LDO |
| Buck Output Current | 1.5 A x 2 | 1.5 A x 2 | 1.5 A x 2 | 1.5 A x 2 | 1.5 A x 2 | 1.5 A x 2 |
| LDO Output Current | 300 mA x 2 | 300 mA x 2 | 300 mA x 2 | 300 mA x 2 | 300 mA x 2 | 300 mA x 2 |
| Input Voltage Range | 2.8 V to 5.5 V | 2.8 V to 5.5 V | 2.8 V to 5.5 V | 2.8 V to 5.5 V | 2.8 V to 5.5 V | 2.8 V to 5.5 V |
| Switching Frequency | 2 MHz internal | 2 MHz external clock 10.4-15.6 MHz | 2 MHz internal | 2 MHz internal | 2 MHz internal | 2 MHz external clock |
| Pb-Free (RoHS) | Yes (/NOPB) | Yes | Yes | Yes | No (no /NOPB suffix) | No (no /NOPB suffix) |
Bảo phân biệt quan trọng
- Highest buck current per channel in this PMIC class (vsLM26480SQ-BF/NOPB)
- Pb-free RoHS-compliant shipping format (vsLM26480SQ-AA (non-/NOPB))
- Four independent enable + power-good pairs in one IC (vsDiscrete 4-rail implementation)
Ghi chú thiết kế
Place the 1 µF + 10 µF ceramic input decoupling network as close as possible to the VIN1/VIN2 pads, with the smaller capacitor closer to the IC. The exposed thermal pad (EP) must be soldered to a continuous ground copper pour of at least 25 mm² to achieve the rated thermal resistance. Star-ground AGND and PGND at a single point directly under the EP - do not run analog and power ground traces separately across the board.
Estimated: with both bucks delivering 1.5 A at VIN=5 V to VOUT=1.2 V, total internal dissipation reaches roughly 1.5 W (0.75 W per buck assuming 80% efficiency) plus LDO dissipation. At 85 °C ambient with the recommended 25 mm² ground pour, junction temperature stays below 105 °C. Without the EP soldered, thermal resistance rises dramatically and the part will thermally shut down at full load.
Do not leave the BST pins floating - each requires a 0.1 µF bootstrap capacitor between BST and SW for the high-side gate drive. Do not exceed the 5.5 V absolute-max VIN. The EN pins have internal pull-downs but should be tied high through a 100 kΩ resistor for noisy environments. Light-load PFM mode can cause audible switching noise in audio applications - force PWM mode by leaving the SYNC pin at the appropriate logic level per the datasheet if this is unacceptable.
Thông tin tuân thủ
Pb-free per /NOPB suffix. Not AEC-Q100 qualified - for automotive applications use TI's TPS65310-Q1 or similar automotive PMIC instead. REACH and conflict-minerals compliance per TI product declaration.
