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Texas Instruments LP3972SQ-E514/NOPB
- Part No.:
- LP3972SQ-E514/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LP3972SQ-E514/NOPB.pdf
- Description:
- IC PMU FOR APP PROCESSOR 40WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,398
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Product details
Overview
LP3972SQ-E514/NOPB from Texas Instruments is a programmable power management unit (PMU) for advanced application processors, integrating three 1.6-A buck regulators (BUCK1–BUCK3), six LDOs (including 30-mA RTC LDO and 400-mA LDO5), I²C-controlled backup battery charger, two GPIOs, and thermal/current protection. It targets smart phones and media players requiring dynamic voltage scaling.
For engineers reviewing the LP3972SQ-E514/NOPB datasheet, LP3972SQ-E514/NOPB pinout, LP3972SQ-E514/NOPB application, or LP3972SQ-E514/NOPB equivalent, key selection criteria include I²C-programmable output voltages (e.g., BUCK1: 0.725–1.5 V, LDO5: 0.85–1.5 V), ±3% output accuracy, 95% peak efficiency, 40-pin WQFN package, and default enable configuration per Table 2 (Version E).
Technical Context
The LP3972SQ-E514/NOPB implements a multi-rail PMU architecture with independent control of three synchronous buck converters and six LDOs via an I²C-compatible high-speed serial interface. Its Version E configuration enables BUCK2 and BUCK3 at startup via SYS_EN, while LDO5 is enabled by PWR_EN - matching Marvell PXA and Samsung application processor power sequencing requirements.
It integrates analog functions including feedback monitoring (FB1–FB3), backup battery switching (nBATT_FLT), RTC supply with tracking capability (LDO_RTC tracks LDO3 within 200 mV), and programmable fault thresholds. All regulators support thermal shutdown (160°C) and current overload protection, with quiescent currents as low as 0.1 µA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN = 2.7 V to 5.5 V - supports single-cell Li-ion and Li-polymer battery input without external pre-regulation |
| BUCK1 Output Range | 0.725 V to 1.5 V, ±3% accuracy - targets core voltage of application processors like Marvell PXA |
| LDO5 Output Range | 0.850 V to 1.5 V, 400 mA max - supplies SRAM rails with low-noise, high-PSRR regulation |
| RTC LDO Output | 2.8 V fixed, 30 mA - powers real-time clock circuitry with automatic main-to-backup battery switchover |
| I²C Interface Speed | 400 kHz - enables fast register programming for dynamic voltage scaling during processor state transitions |
| Package | 40-pin WQFN (5.0 mm × 5.0 mm) - compact footprint suitable for space-constrained handheld PCB layouts |
| Thermal Shutdown | 160°C with 20°C hysteresis - prevents thermal runaway under sustained high-load or poor heatsinking conditions |
Pinout & Package
LP3972SQ-E514/NOPB uses a 40-pin WQFN (RSB) package with 0.5-mm pitch and exposed thermal pad (BGND1,2,3). Pin functions are validated per TI SNVS468L Rev L datasheet Section 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWR_ON | Active-HI push-button input | Signals power-on/off events to CPU via EXT_WAKEUP; controls register 8H'88 content selection |
| nRSTI | Active-LOW reset input | Hardware reset trigger; internally pulled high - used for system-level cold reset initiation |
| nRSTO | Reset output | Drives active-LOW reset signal to application processor upon internal fault or power-up sequencing |
| SCL / SDA | I²C clock/data bidirectional | Enable full software control of all regulator outputs, enable states, and fault thresholds |
| FB1–FB3 | Buck feedback inputs | Close regulation loop for BUCK1–BUCK3; require external resistor dividers for adjustable VOUT |
| LDO_RTC | RTC power output | Provides stable 2.8-V supply to processor RTC; switches automatically to backup battery when main VIN drops below TP1 (2.9 V) |
| nBATT_FLT | Main battery fault indicator | Open-drain active-LOW output signaling low-battery condition (default threshold 2.8 V); allows graceful shutdown |
| GPIO1/nCHG_EN | Configurable I/O / charger enable | Enables DC-source charging of backup coin cell; toggled via I²C or driven externally to control charge path |
Key Features
| Feature | Design Value |
|---|---|
| Three 1.6-A buck regulators | Supports high-current processor core, I/O, and memory rails with up to 95% efficiency and ±3% output accuracy |
| I²C-programmable voltage settings | Enables dynamic voltage scaling (DVS) and runtime reconfiguration without hardware changes |
| Backup battery charger with auto-switch | Charges lithium-manganese coin cells or supercapacitors; seamlessly transfers RTC load between main and backup sources |
| Thermal and current overload protection | Integrated safety logic shuts down affected regulator on overtemperature (160°C) or overcurrent, preventing damage |
| Version E default enable mapping | BUCK2/BUCK3 and LDO2–LDO4 enabled by SYS_EN; LDO5/BUCK1 enabled by PWR_EN - matches Monahans processor sequencing |
Applications
| Smartphone Application Processor Power | Digital Camera Sensor & ISP Supply |
|---|---|
Use Scenario: Powers Marvell PXA3xx or Samsung S3C6410 application processor with multiple voltage domains (core, memory, I/O). IC Role / Device Role / Timing Role: Central PMU managing dynamic voltage scaling across BUCK1 (VCC_APPS), LDO5 (VCC_SRAM), and LDO1–LDO4 for peripherals. Use Value: Reduces system power by 22% vs discrete regulators via optimized buck/LDO partitioning and I²C-controlled idle-state voltage reduction. | Use Scenario: Supplies image sensor analog front-end (AFE), ISP core, and memory interfaces in compact digital cameras. IC Role / Device Role / Timing Role: Provides low-noise 2.8-V LDO_RTC for sensor timing reference and 1.8-V LDO2 for ISP logic, synchronized via SYS_EN/PWR_EN sequencing. Use Value: Eliminates need for external RTC backup switcher; maintains accurate timekeeping during main battery removal using integrated 2.8-V LDO_RTC with auto-switchover. |
| Personal Media Player Audio Subsystem | Application Processor Companion IC |
Use Scenario: Delivers clean, low-ripple power to audio DAC, headphone amplifier, and flash memory in portable media players. IC Role / Device Role / Timing Role: Uses LDO4 (1.0–3.3 V, 150 mA) for analog audio bias and LDO3 (1.8–3.3 V, 150 mA) for flash I/O, both controlled via I²C for noise-sensitive operation. Use Value: Achieves >45 dB PSRR at 10 kHz on LDOs - suppresses switching noise from BUCK regulators to preserve audio SNR. | Use Scenario: Acts as dedicated companion PMU for Freescale i.MX or TI OMAP processors in embedded handheld designs. IC Role / Device Role / Timing Role: Manages power domains independently: BUCK2 (3.3 V) for USB PHY, BUCK3 (1.8 V) for DDR I/O, and GPIO2 for peripheral enable signaling. Use Value: Enables flexible power domain isolation - e.g., keeping DDR rail active during CPU sleep via independent BUCK3 enable control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP3972SQ-A514/NOPB | Version A enables LDO2–LDO4 at startup via SYS_EN; BUCK2 defaults to 3.3 V (not 3.3 V in E version), LDO3 to 3 V (D-disabled) | Targets systems requiring immediate peripheral power-up before full processor boot | Select A514 if early peripheral enable is required; E514 preferred for sequenced power delivery aligned with Monahans CPU |
| LP3972SQ-I514/NOPB | Version I enables LDO3–LDO4 at startup (E-enabled), differs from E514's D-disabled LDO3/LDO4 default | Suitable for designs needing simultaneous activation of multiple I/O rails during initialization | Choose I514 for parallel I/O rail bring-up; E514 provides finer-grained control with mixed enable states per rail |
Compared with LP3972SQ-A514/NOPB and LP3972SQ-I514/NOPB, the LP3972SQ-E514/NOPB offers distinct startup enable mapping - specifically enabling BUCK2/BUCK3 and disabling LDO3/LDO4 by default - making it optimal for Monahans-based platforms requiring staged power domain activation.
Availability
LP3972SQ-E514/NOPB is available at Aetrix Electronics and suitable for smartphone power management, digital camera sensor subsystems, personal media player audio supplies, and application processor companion IC applications requiring stable component supply and long-term lifecycle support.
Supply support for LP3972SQ-E514/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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The LP3972 product line delivers highly integrated, I²C-programmable power management units targeting advanced application processors in handheld consumer electronics, emphasizing dynamic voltage scaling, backup battery autonomy, and compact WQFN packaging.
FAQ
What is the default output voltage configuration for LP3972SQ-E514/NOPB?
The LP3972SQ-E514/NOPB is Version E, with default output voltages defined in TI SNVS468L Table 2: BUCK1 = 1.4 V, BUCK2 = 3.3 V, BUCK3 = 1.8 V, LDO1 = 1.8 V, LDO2 = 1.8 V (E-enabled), LDO3 = 3 V (D-disabled), LDO4 = 3 V (D-disabled), LDO5 = 1.4 V, and LDO_RTC = 2.8 V. All values are programmable via I²C.
Does LP3972SQ-E514/NOPB support automatic backup battery switchover?
Yes, LP3972SQ-E514/NOPB includes an integrated RTC LDO (LDO_RTC) that automatically switches from main battery (VIN) to backup battery (VIN_BUBATT) when main supply falls below TP1 (2.9 V). The nBATT_FLT pin signals low-battery condition, and the backup charger can be enabled via GPIO1/nCHG_EN or I²C.
What package type and thermal characteristics does LP3972SQ-E514/NOPB use?
LP3972SQ-E514/NOPB uses a 40-pin WQFN (RSB) package measuring 5.0 mm × 5.0 mm with 0.5-mm pitch and an exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 25°C/W under JEDEC JESD51-7 4-layer board conditions, supporting up to 2.2 W maximum power dissipation at TA = 70°C.
How is power sequencing controlled on LP3972SQ-E514/NOPB?
LP3972SQ-E514/NOPB uses dual enable inputs: SYS_EN controls BUCK2, BUCK3, LDO1–LDO4 (with D/E flags defining startup state), and PWR_EN controls BUCK1 and LDO5. This allows hierarchical sequencing aligned with Monahans processor requirements - e.g., powering core (BUCK1) and SRAM (LDO5) only after system initialization completes.
What protections are built into LP3972SQ-E514/NOPB?
LP3972SQ-E514/NOPB integrates thermal shutdown (160°C with 20°C hysteresis), current overload protection on all buck regulators (2.1–2.4 A peak limit), short-circuit current limiting on LDOs (400–500 mA), and I²C-configurable nBATT_FLT threshold (2.4–3.4 V). All protections trigger safe shutdown without external components.
LP3972SQ-E514/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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)
LP3972SQ-E514/NOPB FAQ
1.How can I place an order for LP3972SQ-E514/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3972SQ-E514/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 LP3972SQ-E514/NOPB reliable?
The price and inventory of LP3972SQ-E514/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3972SQ-E514/NOPB is usually 5 days.
3.What payment methods are accepted for LP3972SQ-E514/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3972SQ-E514/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3972SQ-E514/NOPB?
LP3972SQ-E514/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3972SQ-E514/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 LP3972SQ-E514/NOPB?
For technical support, including LP3972SQ-E514/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3972SQ-E514/NOPB requirements.
6.How does Aetrix verify that LP3972SQ-E514/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3972SQ-E514/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 LP3972SQ-E514/NOPB meets industry standards.
7.What is the process for return or replacement of LP3972SQ-E514/NOPB?
All LP3972SQ-E514/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3972SQ-E514/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 LP3972SQ-E514/NOPB part is unused and in its original packaging.
Return procedure for LP3972SQ-E514/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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