LM26480SQ-AA/NOPB - Dual Buck + Dual LDO PMIC | Texas Instruments
MPN： LM26480SQ-AA/NOPB ✓ 啟用中LM26480SQ-AA/NOPB 概覽
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.
直接替換替代品，適用於 LM26480SQ-AA/NOPB — 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： LM26480SQ-AA/NOPB （相同外形與佔位） — 差異在於 Package, Topology, Number of Outputs, RoHS Status, Switching Frequency.
LM26480SQ-BF/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
LM26480QSQ-AA/NOPB
✅ 直接替換聯絡詢價
查看資料表 →LM26480SQX-AA/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
LM26480SQ-AA
✅ 直接替換📋 參考替代品（不在目錄中）
LM26480SQ-BF
✅ 直接替換📋 參考替代品（不在目錄中）
LM26480SQ-AA/NOPB 最大額定值與電氣特性
| 拓撲 | Step-Down (Buck) Synchronous x2, Linear (LDO) x2 |
| 輸出數量 | 4 |
| 輸入電壓範圍 | 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) |
| 切換頻率 | 2 MHz |
| Output Voltage Range (Buck) | 1.0 V to 3.3 V |
| 封裝 | 24-pin WQFN (4x4 mm) with exposed pad |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40 °C to +85 °C |
| Enable Pins | Individual per rail (4x) |
| Power-Good Pins | Individual per rail (4x) |
| Light-Load Mode | Automatic PWM/PFM |
| 軟啟動 | Integrated on all rails |
| RoHS 狀態 | Compliant (Pb-Free) |
LM26480SQ-AA/NOPB 腳位配置
| 腳位 1 | VIN1 — Buck 1 input supply |
| 腳位 2 | EN1 — Buck 1 enable (active high) |
| 腳位 3 | PGND1 — Buck 1 power ground |
| 腳位 4 | SW1 — Buck 1 switching node |
| 腳位 5 | BST1 — Buck 1 bootstrap for high-side gate |
| 腳位 6 | FB1 — Buck 1 feedback / Vout set |
| 腳位 7 | AGND — Analog ground (star to PGND) |
| 腳位 8 | PB1 — Buck 1 power-good output |
| 腳位 9 | VIN2 — Buck 2 input supply |
| 腳位 10 | EN2 — Buck 2 enable (active high) |
| 腳位 11 | PGND2 — Buck 2 power ground |
| 腳位 12 | SW2 — Buck 2 switching node |
| 腳位 13 | BST2 — Buck 2 bootstrap for high-side gate |
| 腳位 14 | FB2 — Buck 2 feedback / Vout set |
| 腳位 15 | VREF — Internal reference bypass |
| 腳位 16 | PB2 — Buck 2 power-good output |
| 腳位 17 | EN3 — LDO 1 enable |
| 腳位 18 | INLDO1 — LDO 1 input supply |
| 腳位 19 | OUTLDO1 — LDO 1 output |
| 腳位 20 | EN4 — LDO 2 enable |
| 腳位 21 | INLDO2 — LDO 2 input supply |
| 腳位 22 | OUTLDO2 — LDO 2 output |
| 腳位 23 | PB3/PB4 — LDO power-good outputs (shared) |
| 腳位 24 | EP — Exposed thermal pad - ground |
典型應用
LM26480SQ-AA/NOPB 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 LM26480SQ-AA/NOPB — 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 | 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) |
主要差異化特點
- Highest buck current per channel in this PMIC class (對比LM26480SQ-BF/NOPB)
- Pb-free RoHS-compliant shipping format (對比LM26480SQ-AA (non-/NOPB))
- Four independent enable + power-good pairs in one IC (對比Discrete 4-rail implementation)
設計說明
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.
合規資訊
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.
