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Texas Instruments LP3972SQE-A514/NOPB
- Part No.:
- LP3972SQE-A514/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LP3972SQE-A514/NOPB.pdf
- Description:
- IC POWER MANAGEMENT UNIT 40WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,250
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Product details
Overview
LP3972SQE-A514/NOPB from Texas Instruments is a programmable power management unit (PMU) integrating three 1.6-A buck regulators, six LDOs (including 30-mA RTC LDO), I²C interface, backup battery charger, and dual GPIOs - designed for Marvell PXA, Freescale, and Samsung application processors in smart phones and media players.
For engineers reviewing the LP3972SQE-A514/NOPB datasheet, LP3972SQE-A514/NOPB pinout, LP3972SQE-A514/NOPB application, or LP3972SQE-A514/NOPB equivalent, key selection criteria include default voltage configuration (LDO5 = 1.4 V, BUCK1 = 1.4 V), WQFN-40 package thermal performance (RθJA = 25°C/W), I²C-compatible serial control, and integrated backup battery charging with 2.8-V fault threshold.
Technical Context
The LP3972SQE-A514/NOPB implements a multi-rail PMU architecture with independent enable control (SYS_EN/PWR_EN), programmable output voltages via I²C register map, and hardware-triggered wake-up logic using PWR_ON/nTEST_JIG/SPARE inputs routed to EXT_WAKEUP output. Its buck converters operate in PWM mode with internal 2-MHz oscillator or external SYNC input up to 15.6 MHz.
Regulator sequencing is managed through dedicated digital inputs and internal state machine, supporting dynamic voltage management (DVM) for processor cores and I/O domains. The backup battery charger supports lithium-manganese coin cells and supercapacitors with programmable termination voltage (2.91–3.1 V) and automatic main-to-backup switchover at VRTC falling below 2.9 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7 V to 5.5 V - supports single-cell Li-ion and Li-poly battery input without external pre-regulation |
| BUCK Output Current | 1.6 A per channel - sufficient for high-current processor core and memory rails |
| LDO5 Max Current | 400 mA - powers VCC_SRAM domain with ±3% output accuracy |
| I²C Interface Speed | 400 kHz - enables fast configuration of all regulator outputs and protection thresholds |
| Thermal Shutdown | 160°C with 20°C hysteresis - prevents latch-up during sustained overload or poor PCB thermal design |
| Backup Charger Termination | Programmable 2.91–3.1 V - ensures safe charging of Li-MnO₂ coin cells without overvoltage risk |
| Package Thermal Resistance | RθJA = 25°C/W - requires minimum 50 mm × 50 mm ground plane on 4-layer FR-4 for full 2.2-W dissipation |
Pinout & Package
LP3972SQE-A514/NOPB uses a 40-pin WQFN package (5.00 mm × 5.00 mm) with exposed thermal pad (BGND1,2,3) and 0.5-mm pitch. Pin assignment follows TI's RSB package standard with dedicated analog ground (VREF, FBx), power grounds (PGND1/2/3), and mixed-signal isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PWR_ON | Active-HI push-button input | Triggers EXT_WAKEUP pulse and initiates system power-on sequence via register 8H'88 |
| 4 EXT_WAKEUP | Active-HI open-drain output | 10-ms pulse signals CPU wake event from PWR_ON/nTEST_JIG/SPARE inputs |
| 5 FB1, 23 FB2, 28 FB3 | Analog feedback inputs | Enable precise output voltage regulation for each buck converter; require 1% resistor dividers |
| 21 SDA / 22 SCL | I²C bidirectional data/clock | Supports high-speed register programming and real-time status monitoring (e.g., nBATT_FLT) |
| 24 nRSTO | Active-LOW reset output | Drives processor reset line with 100-ms debounce; synchronized to internal power-good timing |
| 29 GPIO1/nCHG_EN | Configurable I/O / charger enable | When asserted, enables DC source to charge backup battery; polarity programmable via I²C |
Key Features
| Feature | Design Value |
|---|---|
| Three 1.6-A buck regulators | Each supports 0.725–3.3 V output with ±3% accuracy and up to 95% efficiency - reduces heat generation vs. LDO-only solutions |
| Six independent LDOs | LDO_RTC (30 mA @ 2.8 V), LDO1 (300 mA), LDO2–LDO4 (150 mA each), LDO5 (400 mA @ 0.85–1.5 V) - powers RTC, peripherals, and SRAM domains with low noise |
| Backup battery management | Automatic switchover between main battery and Li-MnO₂ coin cell; programmable fault threshold (2.4–3.4 V default 2.8 V) |
| I²C programmability | Full register control of all output voltages, enable states, fault thresholds, and timing delays - eliminates external resistors and jumpers |
| Hardware wake-up logic | Dedicated PWR_ON/nTEST_JIG/SPARE inputs feed into shared EXT_WAKEUP output with configurable polarity - simplifies system-level power sequencing |
Applications
| Smartphone Application Processor Power | Personal Media Player System Management |
|---|---|
|
Use Scenario: Powering Marvell PXA3xx or Samsung S3C6410 SoC with dynamic voltage scaling for CPU, GPU, and memory subsystems. IC Role / Device Role / Timing Role: Central PMU providing sequenced, software-controlled rail generation including BUCK1 (VCC_APPS), LDO5 (VCC_SRAM), and RTC supply. Use Value: Enables DVM-based power optimization reducing active-mode current by >25% versus fixed-voltage regulators. |
Use Scenario: Managing power for portable video playback devices with dual-display support and USB OTG functionality. IC Role / Device Role / Timing Role: Supplies regulated voltages to codec, display driver, and USB PHY while handling battery-fault detection and backup switchover. Use Value: Integrates 6 LDOs + 3 bucks + charger in one WQFN-40 package, cutting board area by 40% vs. discrete solution. |
| Digital Camera Image Signal Processor | Industrial Handheld Terminal |
|
Use Scenario: Powering high-speed CMOS image sensor and ISP in compact camera modules requiring low-noise analog supplies. IC Role / Device Role / Timing Role: Delivers clean 2.8-V LDO_RTC for real-time clock, 1.8-V LDO2 for sensor interface, and 3.3-V BUCK2 for digital core. Use Value: PSRR >45 dB at 10 kHz suppresses switching noise from bucks, preserving image SNR. |
Use Scenario: Supporting ruggedized barcode scanners with extended temperature operation (−40°C to +85°C ambient). IC Role / Device Role / Timing Role: Provides robust power sequencing, thermal shutdown (160°C), and battery-fault signaling (nBATT_FLT) for field-deployed units. Use Value: Guaranteed operation across full industrial temp range with no derating required up to 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Three 1.5-A bucks + 5 LDOs; no integrated backup battery charger; I²C address fixed at 0x2D | Lacks automatic main-to-backup switchover and coin-cell charging; suited for systems with external RTC backup | Select when backup battery management is handled externally and lower quiescent current (21 µA no-load) is prioritized |
| MAX8649ETE+ | Three 1.2-A bucks + 4 LDOs; 2.5-V to 5.5-V VIN; no RTC LDO or battery fault monitoring | Missing dedicated 30-mA RTC rail and nBATT_FLT output; requires external supervisor for battery health monitoring | Choose for cost-sensitive designs where RTC supply is derived from main LDO and battery fault is monitored by host MCU |
Compared with TPS65023RSBR and MAX8649ETE+, the LP3972SQE-A514/NOPB uniquely integrates backup battery charging with automatic switchover, a dedicated 30-mA RTC LDO, and programmable nBATT_FLT threshold - making it optimal for battery-backed portable systems requiring guaranteed RTC operation during main power loss.
Availability
LP3972SQE-A514/NOPB is available at Aetrix Electronics and suitable for smartphone power delivery, portable media player system management, digital camera ISP powering, industrial handheld terminals, and battery-backed real-time clock applications requiring stable component supply across long production lifecycles.
Supply support for LP3972SQE-A514/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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LP3972SQE-A514/NOPB belongs to TI's application-processor-optimized PMU product line, engineered specifically to meet the dynamic voltage management, compact footprint, and battery-aware power sequencing requirements of advanced handheld platforms.
FAQ
What is the default output voltage configuration for LP3972SQE-A514/NOPB?
The LP3972SQE-A514/NOPB defaults to LDO5 = 1.4 V (VCC_SRAM), BUCK1 = 1.4 V (VCC_APPS), LDO1 = 1.8 V (VCC_MVT), and LDO_RTC = 2.8 V. These values are factory-programmed and can be modified via I²C register writes. The version code "A514" indicates Version A enable mapping with LDO2/LDO3/LDO4 enabled at startup.
Does LP3972SQE-A514/NOPB support external clock synchronization?
Yes, LP3972SQE-A514/NOPB supports external clock synchronization via the SYNC pin (Pin 35). When driven with a 10.4–15.6 MHz signal, it synchronizes internal buck switching to reduce EMI and enable phase alignment with other system clocks - critical for noise-sensitive audio or RF subsystems.
How does the backup battery charger function in LP3972SQE-A514/NOPB?
The LP3972SQE-A514/NOPB backup battery charger automatically switches between main battery and lithium-manganese coin cell when main supply falls below 2.9 V (TP1 threshold). It delivers programmable charge current up to 190 µA and terminates at 2.91–3.1 V, preventing overcharge. Charging is enabled via GPIO1/nCHG_EN or I²C command.
What thermal design considerations apply to LP3972SQE-A514/NOPB?
LP3972SQE-A514/NOPB has RθJA = 25°C/W in a standard 4-layer FR-4 board layout. To sustain 2.2 W maximum power dissipation, the PCB must include a 50 mm × 50 mm copper ground plane under the exposed thermal pad (BGND1,2,3), ≥8 thermal vias, and minimal trace resistance to GND. Ambient temperature must be limited to ≤70°C for full-rated operation.
Can LP3972SQE-A514/NOPB be used without I²C configuration?
Yes, LP3972SQE-A514/NOPB operates autonomously using factory-default voltage settings and enable mappings. All regulators power up according to SYS_EN/PWR_EN logic states and internal sequencing. I²C is optional for runtime reconfiguration, fault logging, or fine-tuning - not required for basic boot functionality.
LP3972SQE-A514/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Bulk
- 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)
LP3972SQE-A514/NOPB FAQ
1.How can I place an order for LP3972SQE-A514/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3972SQE-A514/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 LP3972SQE-A514/NOPB reliable?
The price and inventory of LP3972SQE-A514/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3972SQE-A514/NOPB is usually 5 days.
3.What payment methods are accepted for LP3972SQE-A514/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3972SQE-A514/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3972SQE-A514/NOPB?
LP3972SQE-A514/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3972SQE-A514/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 LP3972SQE-A514/NOPB?
For technical support, including LP3972SQE-A514/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3972SQE-A514/NOPB requirements.
6.How does Aetrix verify that LP3972SQE-A514/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3972SQE-A514/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 LP3972SQE-A514/NOPB meets industry standards.
7.What is the process for return or replacement of LP3972SQE-A514/NOPB?
All LP3972SQE-A514/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3972SQE-A514/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 LP3972SQE-A514/NOPB part is unused and in its original packaging.
Return procedure for LP3972SQE-A514/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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