LM26480SQ-AA/NOPB - Dual Buck + Dual LDO PMIC | Texas Instruments
MPN: LM26480SQ-AA/NOPB ✓ פעילLM26480SQ-AA/NOPB סקירה
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.
חלופות תחליף ישיר עבור LM26480SQ-AA/NOPB — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם LM26480SQ-AA/NOPB (אותו גורם צורה וטביעת רגל) — שונים ב Package, Topology, Number of Outputs, RoHS Status, Switching Frequency.
LM26480SQ-BF/NOPB
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LM26480QSQ-AA/NOPB
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←LM26480SQX-AA/NOPB
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LM26480SQ-AA
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LM26480SQ-BF
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LM26480SQ-AA/NOPB דירוגים מרביים ומאפיינים חשמליים
| טופולוגיה | Step-Down (Buck) Synchronous x2, Linear (LDO) x2 |
| מספר יציאות | 4 |
| טווח מתח כניסה | 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) |
| תדר מיתוג | 2 MHz |
| Output Voltage Range (Buck) | 1.0 V to 3.3 V |
| מארז | 24-pin WQFN (4x4 mm) with exposed pad |
| סוג הרכבה | Surface Mount |
| טמפרטורת פעולה | -40 °C to +85 °C |
| Enable Pins | Individual per rail (4x) |
| Power-Good Pins | Individual per rail (4x) |
| Light-Load Mode | Automatic PWM/PFM |
| התנעה רכה | Integrated on all rails |
| סטטוס RoHS | Compliant (Pb-Free) |
תצורת פינים של LM26480SQ-AA/NOPB
| פין 1 | VIN1 — Buck 1 input supply |
| פין 2 | EN1 — Buck 1 enable (active high) |
| פין 3 | PGND1 — Buck 1 power ground |
| פין 4 | SW1 — Buck 1 switching node |
| פין 5 | BST1 — Buck 1 bootstrap for high-side gate |
| פין 6 | FB1 — Buck 1 feedback / Vout set |
| פין 7 | AGND — Analog ground (star to PGND) |
| פין 8 | PB1 — Buck 1 power-good output |
| פין 9 | VIN2 — Buck 2 input supply |
| פין 10 | EN2 — Buck 2 enable (active high) |
| פין 11 | PGND2 — Buck 2 power ground |
| פין 12 | SW2 — Buck 2 switching node |
| פין 13 | BST2 — Buck 2 bootstrap for high-side gate |
| פין 14 | FB2 — Buck 2 feedback / Vout set |
| פין 15 | VREF — Internal reference bypass |
| פין 16 | PB2 — Buck 2 power-good output |
| פין 17 | EN3 — LDO 1 enable |
| פין 18 | INLDO1 — LDO 1 input supply |
| פין 19 | OUTLDO1 — LDO 1 output |
| פין 20 | EN4 — LDO 2 enable |
| פין 21 | INLDO2 — LDO 2 input supply |
| פין 22 | OUTLDO2 — LDO 2 output |
| פין 23 | PB3/PB4 — LDO power-good outputs (shared) |
| פין 24 | EP — Exposed thermal pad - ground |
יישומים טיפוסיים
LM26480SQ-AA/NOPB מתאים עבור 6 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור LM26480SQ-AA/NOPB — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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) |
מבדילים עיקריים
- Highest buck current per channel in this PMIC class (לעומתLM26480SQ-BF/NOPB)
- Pb-free RoHS-compliant shipping format (לעומתLM26480SQ-AA (non-/NOPB))
- Four independent enable + power-good pairs in one IC (לעומתDiscrete 4-rail implementation)
הערות תכנון
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.
מידע על תאימות
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.
