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Texas Instruments LP3971SQX-B410/NOPB
- Part No.:
- LP3971SQX-B410/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LP3971SQX-B410/NOPB.pdf
- Description:
- IC PMU FOR APP PROCESSOR 40WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,091
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Product details
Overview
LP3971SQX-B410/NOPB from Texas Instruments is a programmable power management unit (PMU) for advanced application processors, integrating three 1.6A buck regulators, six LDOs (including 30 mA RTC LDO), I²C interface, and backup battery charger. It delivers ±3% output voltage accuracy, up to 95% buck efficiency, and operates across −40°C to +85°C ambient temperature in handheld devices.
For engineers reviewing the LP3971SQX-B410/NOPB datasheet, LP3971SQX-B410/NOPB pinout, LP3971SQX-B410/NOPB application, or LP3971SQX-B410/NOPB equivalent, this PMU supports dynamic voltage management (DVM) in PDA phones, smart phones, and media players with precise multi-rail sequencing, thermal/current protection, and battery-fault-aware RTC power switching.
Technical Context
The LP3971SQX-B410/NOPB implements a fully integrated PMU architecture with independent I²C-programmable control of all three buck converters (0.725–3.3 V, 1.6 A max) and six LDOs (1.0–3.3 V, 30–370 mA). Its internal 2 MHz oscillator supports forced PWM or PFM operation, and SYNC input enables external clock synchronization for EMI reduction.
It features hardware-controlled battery switchover logic between main and backup supplies for the RTC LDO, with programmable nBATT_FLT threshold (default 2.8 V) and hysteresis (≈300 mV), plus dual enable inputs (SYS_EN and PWR_EN) for domain-specific power sequencing in Marvell PXA and Samsung application processors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | Up to 1.6 A per channel - supports high-current core/I/O rails of application processors without external current boosting. |
| LDO Accuracy | ±3% over −40°C to +125°C - ensures stable voltage for sensitive analog/RTC circuits under thermal stress. |
| I²C Interface | High-speed compatible - enables real-time software control of VOUT, enable states, and fault registers during system runtime. |
| RTC Backup Switching | Automatic main-to-coin-cell switchover at ~2.8 V with 300 mV hysteresis - maintains RTC operation during main battery depletion. |
| Package | 40-pin WQFN (5 mm × 5 mm, RSB0040A) - compact footprint with dedicated PGND pins per buck stage for low-noise layout. |
| Thermal Protection | 160°C shutdown with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Dropout Voltage (LDO5) | 100 mV typical at 370 mA - minimizes power loss and heat generation in low-VIN, high-current peripheral rails. |
Pinout & Package
LP3971SQX-B410/NOPB uses a 40-pin WQFN package (Package Number RSB0040A, 5 mm × 5 mm, 0.4 mm pitch) with exposed thermal pad (BGND1,2,3) and separate power grounds per buck stage for optimal noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWR_ON | Active-HI push-button input | Triggers system power-on/off events and configures register 8H'02 for wake-up source identification. |
| EXT_WAKEUP | Open-drain output | Generates 10 ms pulse to CPU on any wake event (PWR_ON/nTEST_JIG/SPARE), signaling interrupt-driven register interrogation. |
| FB1–FB3 | Analog feedback inputs | Enable precision closed-loop regulation of each buck converter; require external resistor dividers for VOUT programming. |
| VIN Buck1–3 | Main battery input per buck | Accepts 2.7–5.5 V; allows independent input sourcing (e.g., VIN Buck1 from main battery, VIN Buck2 from LDO1). |
| GPIO1/nCHG_EN | Configurable I/O | Functions as general-purpose I/O or active-low backup battery charger enable - toggled via I²C to control charging timing. |
| nBATT_FLT | Open-drain fault output | Asserts low when main battery falls below programmed threshold (default 2.8 V), giving processor time to initiate graceful shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Triple synchronous buck regulators | Each delivers up to 1.6 A with 95% peak efficiency and internal 2 MHz switching - eliminates need for external MOSFETs or controllers. |
| 6-channel programmable LDO set | LDO1–5 support 1.0–3.3 V outputs (30–370 mA); LDO_RTC provides 30 mA with automatic battery switchover - covers all processor subdomains. |
| I²C-based dynamic voltage management | Enables real-time VOUT adjustment and sequencing control during DVFS transitions - critical for Marvell PXA and Samsung AP power optimization. |
| Integrated backup battery charger | Programmable 150/300/370 mA charge current with termination voltage control - supports Li-Mn coin cells and supercapacitors without external circuitry. |
| Dual-domain enable architecture | SYS_EN controls high-voltage rails (buck1/buck2/LDO1–3); PWR_EN controls low-voltage rails (buck3/LDO4–5) - enables hierarchical power-up/down sequencing. |
Applications
| Smartphone Baseband Power | PDA Application Processor Rail |
|---|---|
|
Use Scenario: Powers ARM-based baseband SoC with dynamically scaled core, memory, and RF interface voltages. IC Role / Device Role / Timing Role: PMU providing sequenced, I²C-adjustable buck and LDO outputs synchronized to processor DVFS commands. Use Value: Enables >20% battery life extension via precise DVM and eliminates discrete regulator count by integrating 9 power rails. |
Use Scenario: Supplies multiple voltage domains (core, I/O, RTC, camera interface) in a handheld PDA with hot-swappable battery. IC Role / Device Role / Timing Role: Centralized power controller managing SYS_EN/PWR_EN-triggered startup and nBATT_FLT-initiated fallback to backup cell. Use Value: Guarantees uninterrupted RTC operation during main battery replacement and reduces BOM cost by 37% vs. discrete solution. |
| Digital Camera Sensor Cluster | Media Player Audio Codec Supply |
|
Use Scenario: Delivers clean, low-noise bias to CMOS image sensor, ISP, and flash LED driver in compact digital camera. IC Role / Device Role / Timing Role: LDO4/LDO5 provide 1.0 V and 3.3 V with <100 mV dropout and 45 dB PSRR; buck3 powers sensor analog front-end. Use Value: Maintains <10 mV output ripple under 300 mA load, preventing image noise and enabling 12-bit ADC linearity. |
Use Scenario: Powers stereo audio codec, DAC, and headphone amplifier in portable media player with variable playback load. IC Role / Device Role / Timing Role: LDO2 (3.3 V, 150 mA) and LDO3 (2.5 V, 150 mA) supply codec analog/digital rails; buck1 powers Class-D amp. Use Value: Achieves <−70 dB THD+N via low-noise LDOs and fast load transient response (<50 µs recovery), eliminating audible artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Three buck (1.5 A), five LDO (20–260 mA); no backup battery charger; 48-pin QFN | Lacks RTC battery switchover and charging; suited for non-RTC-critical embedded systems | Select when backup battery functionality is unnecessary and higher LDO count is not required. |
| MAX8649ETE+ | Three buck (1.2 A), four LDO (150–300 mA); I²C interface; no integrated charger or RTC LDO | Requires external RTC power path and charger IC; smaller 24-pin TQFN package | Choose for space-constrained designs where RTC autonomy is handled externally and lower current capability suffices. |
Compared with LP3971SQX-B410/NOPB, TPS65023RSBR offers higher pin count but omits backup battery management entirely, while MAX8649ETE+ reduces footprint and cost at the expense of RTC autonomy and peak buck current - making LP3971SQX-B410/NOPB uniquely suited for battery-backed portable APs requiring guaranteed RTC uptime.
Availability
LP3971SQX-B410/NOPB is available at Aetrix Electronics and suitable for smartphone baseband power, PDA application processor rail, digital camera sensor cluster, and media player audio codec supply requiring stable component supply across long-life consumer electronics programs.
Supply support for LP3971SQX-B410/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 is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-efficiency DC/DC conversion and system-level power architecture.
The LP3971 product line was engineered specifically for advanced application processors in portable electronics, delivering integrated DVM, multi-rail sequencing, and battery-aware power management in a single WQFN package.
FAQ
What is the default output voltage configuration for LP3971SQX-B410/NOPB?
The LP3971SQX-B410/NOPB defaults to B-version firmware: LDO1 = 3.3 V (SYS_EN enabled), LDO2 = 3.0 V, LDO3 = 3.0 V, LDO4 = 1.3 V (PWR_EN enabled), LDO5 = 1.1 V (PWR_EN enabled), BUCK1 = 1.4 V (PWR_EN enabled), BUCK2 = 3.0 V (SYS_EN enabled), BUCK3 = 1.8 V (SYS_EN enabled), and LDO_RTC = 2.8 V with tracking disabled. All values are confirmed in TI's Default Voltage Options table for version B.
Does LP3971SQX-B410/NOPB support external clock synchronization?
Yes, LP3971SQX-B410/NOPB supports external clock synchronization via the SYNC pin (Pin 35), which accepts an external 10.4–15.6 MHz clock signal to align its internal 2 MHz oscillator - reducing EMI in noise-sensitive applications such as camera modules and audio subsystems.
How does the backup battery switchover function in LP3971SQX-B410/NOPB?
LP3971SQX-B410/NOPB automatically switches the RTC LDO input from main battery to backup coin cell when main voltage drops below ~2.8 V (programmable), with ~300 mV hysteresis to prevent oscillation. The nBATT_FLT pin asserts low to warn the host processor, and the switch is fully autonomous - no firmware intervention required for LP3971SQX-B410/NOPB operation.
What is the maximum supported I²C clock frequency for LP3971SQX-B410/NOPB?
LP3971SQX-B410/NOPB supports standard- and fast-mode I²C communication up to 400 kHz, as verified in TI's Logic Inputs and Outputs DC Operating Conditions section. This enables reliable register read/write access for dynamic voltage scaling and fault monitoring without timing margin violations.
Can LP3971SQX-B410/NOPB operate with input voltage below 2.7 V?
No - LP3971SQX-B410/NOPB requires minimum 2.7 V on VIN, VIN Buck1–3, and VINLDO4/5 per Absolute Maximum and Operating Ratings. Operation below 2.7 V violates specification limits and may cause unregulated output, brownout reset, or undefined behavior; the device is not characterized for sub-2.7 V operation.
LP3971SQX-B410/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Processor
- Current - Supply:
- 60µA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-WQFN (5x5)
LP3971SQX-B410/NOPB FAQ
1.How can I place an order for LP3971SQX-B410/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3971SQX-B410/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 LP3971SQX-B410/NOPB reliable?
The price and inventory of LP3971SQX-B410/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3971SQX-B410/NOPB is usually 5 days.
3.What payment methods are accepted for LP3971SQX-B410/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3971SQX-B410/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3971SQX-B410/NOPB?
LP3971SQX-B410/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3971SQX-B410/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 LP3971SQX-B410/NOPB?
For technical support, including LP3971SQX-B410/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3971SQX-B410/NOPB requirements.
6.How does Aetrix verify that LP3971SQX-B410/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3971SQX-B410/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 LP3971SQX-B410/NOPB meets industry standards.
7.What is the process for return or replacement of LP3971SQX-B410/NOPB?
All LP3971SQX-B410/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3971SQX-B410/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 LP3971SQX-B410/NOPB part is unused and in its original packaging.
Return procedure for LP3971SQX-B410/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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