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Texas Instruments LM26480QSQ-CF/NOPB
- Part No.:
- LM26480QSQ-CF/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM26480QSQ-CF/NOPB.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,180
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Product details
Overview
LM26480QSQ-CF/NOPB from Texas Instruments (formerly National Semiconductor) is an automotive-grade power management IC integrating two 1.5A synchronous step-down DC/DC converters and two 300 mA low-noise LDOs in a 4×4×0.8 mm LLP-24 package. It delivers core digital power for applications processors, supports forced PWM mode at 2.1 MHz, and features AEC-Q100 Grade 1 qualification for under-hood automotive use.
For engineers reviewing the LM26480QSQ-CF/NOPB datasheet, LM26480QSQ-CF/NOPB pinout, LM26480QSQ-CF/NOPB application, or LM26480QSQ-CF/NOPB equivalent, key selection considerations include its dual-buck + dual-LDO architecture, 2.1 MHz fixed-frequency operation, automotive thermal and reliability specs (–40°C to +125°C TJ), and precise power-on-reset timing with 60 ms delay.
Technical Context
The LM26480QSQ-CF/NOPB implements voltage-mode control with internal synchronous rectification in both buck stages, enabling up to 96% efficiency and 25 mV typical dropout in LDOs. Its forced PWM mode eliminates automatic PFM transitions, ensuring deterministic switching behavior critical for EMI-sensitive automotive systems.
It integrates independent enable pins (ENSW1/ENSW2/ENLDO1/ENLDO2), dedicated feedback inputs (FB1/FB2/FBL1/FBL2), and a shared nPOR open-drain output that monitors both buck outputs with 92%/82% rising/falling thresholds - all operating within a validated –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 1.5 A per channel - supports high-current processor core and I/O rails |
| LDO Output Current | 300 mA per channel - sufficient for analog peripherals and interface circuitry |
| Switching Frequency | 2.1 MHz - enables compact external components and reduces EMI below sensitive bands |
| Feedback Accuracy | ±3% - ensures tight output regulation across temperature and load |
| Junction Temp Range | –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for automotive under-hood deployment |
| Dropout Voltage (LDO) | 25 mV (typ) at 50 mA - minimizes power loss during low-headroom operation |
| UVLO Threshold | 2.7 V (falling), 2.9 V (rising) - prevents unstable regulator startup during battery brownout |
Pinout & Package
LM26480QSQ-CF/NOPB uses a thermally enhanced 24-pin LLP (Leadless Leadframe Package) measuring 4 mm × 4 mm × 0.8 mm, with exposed DAP (Die Attach Pad) recommended for thermal dissipation. The package includes dedicated ground planes (GND_SW1, GND_SW2, GND_C, GND_L) and separate analog/digital power domains (VINLDO12, AVDD).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VINLDO12 | Analog Power Input | Supplies bias, reference, and logic circuits; must be ≥2.8 V for UVLO release |
| 3 NPOR | Open-Drain Power-On Reset Output | Asserts LOW when either Buck1 or Buck2 output falls below 82% of target; requires external 100 kΩ pull-up |
| 5 SW1 / 14 SW2 | Buck Switch Node Outputs | Connect to external inductor and output capacitor; require careful layout for EMI and thermal performance |
| 7 ENSW1 / 12 ENSW2 | Digital Enable Inputs | Active-HIGH control for individual buck stages; must not float - tie to GND or logic HIGH |
| 20 LDO1 / 23 LDO2 | LDO Regulated Outputs | Low-noise analog supplies; each configurable via external resistor divider on FBL1/FBL2 |
| DAP | Thermal Pad | Internally connected to GND; soldering improves thermal resistance by ~30% versus no connection |
Key Features
| Feature | Design Value |
|---|---|
| Forced PWM Mode | Eliminates PFM transitions - ensures consistent 2.1 MHz switching for predictable EMI and timing |
| AEC-Q100 Grade 1 Qualification | Validated for automotive operation from –40°C to +125°C TJ with full thermal shutdown (160°C) and hysteresis |
| Dual Independent nPOR Monitoring | Single open-drain output reflects fault status of both buck regulators with programmable 60 ms delay |
| Low-Noise LDO Architecture | 150 µVrms output noise and 45 dB PSRR at 10 kHz - suitable for ADC references and RF biasing |
| Integrated UVLO & Thermal Protection | Prevents startup below 2.8 V input and disables all regulators above 160°C junction temperature |
Applications
| ADAS Camera Module Power | Infotainment SoC Core Supply |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.2 V) and ISP (1.8 V) in rear-view camera modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: LM26480QSQ-CF/NOPB provides regulated core and I/O voltages while maintaining AEC-Q100 compliance and deterministic 2.1 MHz switching. Use Value: Enables single-chip solution replacing discrete buck+LDO combinations, reducing BOM count and PCB area by >40%. | Use Scenario: Power sequencing for quad-core application processor in head-unit systems requiring synchronized rail bring-up. IC Role / Device Role / Timing Role: LM26480QSQ-CF/NOPB delivers 1.1 V core and 3.3 V I/O rails with coordinated nPOR assertion and 60 ms delay for system reset coordination. Use Value: Eliminates need for external sequencer IC and reduces startup timing uncertainty to ±5 µs. |
| Automotive Telematics Modem | Body Control Module MCU Supply |
Use Scenario: Compact power solution for LTE/Wi-Fi modem subsystems where space and thermal constraints limit discrete solutions. IC Role / Device Role / Timing Role: LM26480QSQ-CF/NOPB supplies 1.8 V analog and 3.0 V digital rails using integrated buck converters and LDOs with forced PWM for clean RF performance. Use Value: Achieves <15 mVpp output ripple at full load - meets stringent RF front-end supply noise requirements. | Use Scenario: Centralized power for 32-bit MCU, CAN transceiver, and LIN interface in door module ECUs. IC Role / Device Role / Timing Role: LM26480QSQ-CF/NOPB powers MCU core (1.2 V), I/O (3.3 V), and CAN PHY (5 V via external charge pump) with undervoltage lockout protection. Use Value: Integrates UVLO monitoring on VINLDO12 to prevent erratic MCU behavior during cold-cranking events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023BRSBT | Triple 1.5A buck + dual 300 mA LDO; 2.25 MHz switching; no AEC-Q100 rating | Targeted at industrial/portable, not automotive; lacks nPOR coordination across rails | Select when AEC-Q100 is not required and triple-buck capability is needed |
| MAX20004AATP+T | Dual 2.5A buck + dual 300 mA LDO; 2.2 MHz; AEC-Q100 Grade 1; integrated watchdog | Higher current capability and added safety features; larger 5×5 mm TQFN package | Select when >1.5A per buck is required or functional safety monitoring is mandated |
Compared with TPS65023BRSBT and MAX20004AATP+T, LM26480QSQ-CF/NOPB offers optimal balance of automotive qualification, compact 4×4 mm footprint, and deterministic forced-PWM operation - making it ideal for space-constrained ADAS and infotainment submodules where EMI predictability and thermal robustness are prioritized over raw current headroom.
Availability
LM26480QSQ-CF/NOPB is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power delivery, and telematics modem subsystems requiring stable component supply with guaranteed AEC-Q100 Grade 1 compliance.
Supply support for LM26480QSQ-CF/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for legacy power management products including the LM26480 series.
The LM26480 product line was designed specifically for automotive and industrial applications requiring tightly regulated, multi-rail power with integrated sequencing, fault monitoring, and extended temperature operation - targeting next-generation ECUs and domain controllers.
FAQ
What is the switching frequency configuration of LM26480QSQ-CF/NOPB?
The LM26480QSQ-CF/NOPB is factory-configured for forced PWM mode at 2.1 MHz - unlike other variants such as LM26480QSQ-AA/NOPB which default to auto-mode. This fixed frequency eliminates PFM transitions, ensuring consistent EMI profile and simplifying filter design for automotive EMC compliance. The oscillator tolerance is ±20% (1.7–2.5 MHz), verified across –40°C to +125°C.
Does LM26480QSQ-CF/NOPB support power sequencing between its rails?
Yes, LM26480QSQ-CF/NOPB supports coordinated power sequencing via its nPOR output, which asserts LOW until both Buck1 and Buck2 reach ≥92% of their target voltages and remain stable for 60 ms. This built-in delay allows external logic or microcontrollers to synchronize initialization of downstream components - eliminating need for discrete timers or sequencer ICs in automotive body control and ADAS modules.
What are the minimum input voltage requirements for LM26480QSQ-CF/NOPB's LDOs?
LM26480QSQ-CF/NOPB's LDO1 and LDO2 require minimum input voltage of 1.74 V on VINLDO1 and VINLDO2 respectively - specified for operation with PMOS pass devices. This enables direct connection to buck converter outputs (e.g., 1.8 V or 2.5 V rails) without additional headroom overhead. Dropout remains ≤200 mV at 300 mA load, ensuring stable regulation even under worst-case conditions.
How does the UVLO function operate on LM26480QSQ-CF/NOPB?
The UVLO circuit in LM26480QSQ-CF/NOPB continuously monitors VINLDO12 and disables all four regulators (both bucks and both LDOs) when input falls below 2.7 V (falling threshold) or remains disabled until input rises above 2.9 V (rising threshold). This hysteresis prevents oscillation during battery brownout events common in automotive cold-cranking, and is independent of enable pin states - ensuring fail-safe behavior even if EN pins are asserted prematurely.
Is thermal pad (DAP) connection mandatory for LM26480QSQ-CF/NOPB?
No, DAP connection is not electrically mandatory for LM26480QSQ-CF/NOPB operation, but TI strongly recommends soldering the exposed thermal pad to a solid GND plane. Doing so reduces θJA from 34.1°C/W to approximately 24°C/W - improving thermal margin by >30% and enabling sustained 1.5 A output current at +85°C ambient without derating. Layout guidelines specify minimum 8×8 mm copper pour with 4+ thermal vias to inner GND layers.
LM26480QSQ-CF/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 2MHz
- Voltage/Current - Output 1:
- 0.8V ~ 2V, 1.5A
- Voltage/Current - Output 2:
- 1V ~ 3.3V, 1.5A
- Voltage/Current - Output 3:
- 1V ~ 3.5V, 300mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LM26480QSQ-CF/NOPB FAQ
1.How can I place an order for LM26480QSQ-CF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26480QSQ-CF/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM26480QSQ-CF/NOPB reliable?
The price and inventory of LM26480QSQ-CF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26480QSQ-CF/NOPB is usually 5 days.
3.What payment methods are accepted for LM26480QSQ-CF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26480QSQ-CF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26480QSQ-CF/NOPB?
LM26480QSQ-CF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26480QSQ-CF/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM26480QSQ-CF/NOPB?
For technical support, including LM26480QSQ-CF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26480QSQ-CF/NOPB requirements.
6.How does Aetrix verify that LM26480QSQ-CF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26480QSQ-CF/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM26480QSQ-CF/NOPB meets industry standards.
7.What is the process for return or replacement of LM26480QSQ-CF/NOPB?
All LM26480QSQ-CF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26480QSQ-CF/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM26480QSQ-CF/NOPB part is unused and in its original packaging.
Return procedure for LM26480QSQ-CF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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