My Inquiry
My Account
Texas Instruments LP3972SQX-5810/NOPB
- Part No.:
- LP3972SQX-5810/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LP3972SQX-5810/NOPB.pdf
- Description:
- IC PMU APPL PROCESSOR 40WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,752
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP3972SQX-5810/NOPB from Texas Instruments is a programmable power management unit (PMU) for advanced application processors, integrating three magnetic buck regulators (BUCK1–BUCK3), six LDOs (including RTC-specific LDO_RTC), a backup battery charger, I²C interface, and two GPIOs. It delivers 1.6-A output per buck, ±3% output voltage accuracy, and supports dynamic voltage management in handheld devices.
For engineers reviewing the LP3972SQX-5810/NOPB datasheet, LP3972SQX-5810/NOPB pinout, LP3972SQX-5810/NOPB application, or LP3972SQX-5810/NOPB equivalent, this page provides verified regulator configurations (e.g., BUCK1 = 1.35 V, LDO4 = 1.3 V, LDO5 = 1.1 V), thermal shutdown at 160°C, WQFN-40 package mapping, and I²C-compatible serial control - all confirmed for the exact LP3972SQX-5810/NOPB variant.
Technical Context
The LP3972SQX-5810/NOPB implements a multi-rail PMU architecture with independent enable logic (SYS_EN/PWR_EN), programmable I²C register control (address 0x48), and hardware fault signaling via nBATT_FLT and nRSTO. Its buck converters use internal PFET/NFET switches (RDSON_P = 240 mΩ, RDSON_N = 200 mΩ) and support synchronization to external clocks via SYNC pin.
It integrates a dedicated 30-mA RTC LDO with automatic main-to-backup battery switchover (TP1 = 2.9 V, TP2 = 3.0 V), programmable backup charger (termination = 3.1 V, max current = 190 µA), and digital logic inputs compliant with VRTC-referenced thresholds (VIH ≥ VRTC − 0.5 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. |
| BUCK1 Output Voltage | 1.35 V - factory-programmed default for VCC_APPS rail in Monahans-class application processors. |
| LDO5 Output Voltage | 1.1 V - factory-programmed for VCC_SRAM domain with ±3% accuracy and 150-mV dropout at 50 mA. |
| Backup Charger Termination | 3.1 V - programmable termination voltage ensures safe charging of lithium-manganese coin cells or supercapacitors. |
| I²C Clock Frequency | 400 kHz - high-speed mode compatible with standard microcontroller I²C peripherals. |
| Thermal Shutdown | 160°C - protects against sustained overload; 20°C hysteresis enables automatic recovery after cooling. |
| Package | WQFN-40 (5.0 mm × 5.0 mm) - thermally enhanced exposed pad for PCB heat dissipation in space-constrained handheld designs. |
Pinout & Package
LP3972SQX-5810/NOPB uses a 40-pin WQFN package (RSB) with 0.4-mm pitch and exposed thermal pad. Pin numbering follows TI's top-view layout with GND pins distributed across corners (GND1, PGND1–3, BGND1–3) for low-impedance return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PWR_ON | Active-HI push-button input | Triggers EXT_WAKEUP pulse and register 0x88 flag for CPU power-event detection. |
| 4 EXT_WAKEUP | Active-HI 10-ms pulse output | Signals CPU wake event from PWR_ON/nTEST_JIG/SPARE; requires external pull-up. |
| 5 FB1 | Buck1 feedback input | Connects to resistor divider on BUCK1 output to set 1.35 V with ±3% regulation accuracy. |
| 6 VIN | Main battery input | Supplies internal circuitry, LDO1–LDO3, and buck converter inputs (VIN_BUCK1/2/3). |
| 16 LDO_RTC | RTC power output | Delivers stable 2.8 V @ 30 mA; automatically switches to backup battery when VIN falls below TP1 (2.9 V). |
| 17 nBATT_FLT | Active-LOW battery fault flag | Asserts when VIN drops below programmable threshold (default 2.8 V); signals imminent system shutdown. |
| 21 SDA / 22 SCL | I²C bidirectional data/clock | Open-drain interface requiring external 2–20 kΩ pull-ups; supports 400-kHz high-speed mode. |
| 24 nRSTO | Active-LOW reset output | Drives processor reset line; synchronized to internal power-good sequencing and fault conditions. |
| 29 GPIO1/nCHG_EN | Configurable I/O / charger enable | When asserted, enables DC-source charging of backup battery; polarity and function software-selectable. |
| 35 SYNC | External clock sync input | Accepts 10.4–15.6 MHz reference to synchronize internal oscillator and reduce EMI in multi-PMU systems. |
Key Features
| Feature | Design Value |
|---|---|
| Three integrated buck regulators | Each delivers up to 1.6 A with 95% peak efficiency and programmable 25-mV output steps (0.725–3.3 V range). |
| Six precision LDOs | LDO_RTC (2.8 V/30 mA), LDO1 (1.8 V/300 mA), LDO2–LDO4 (1.8–3.3 V/150 mA), LDO5 (1.1 V/400 mA) - all with ±3% accuracy and <0.011%/mA load regulation. |
| Automatic backup battery switchover | Seamless transition between main battery and coin-cell/supercapacitor with 2.9 V turn-off (TP1) and 3.0 V turn-on (TP2) thresholds. |
| I²C programmability | Full register-level control of all regulator outputs, enable states, fault thresholds, and timing parameters via 7-bit address 0x48. |
| Hardware safety protections | Thermal shutdown (160°C), overcurrent limiting (2.4-A peak buck), short-circuit protection (400–500 mA LDO), and undervoltage lockout. |
Applications
| Smartphone Power Architecture | Digital Camera Core Supply |
|---|---|
|
Use Scenario: Powering Marvell PXA or Samsung application processors with multiple voltage domains (VCC_APPS, VCC_SRAM, VCC_MVT). IC Role / Device Role / Timing Role: Central PMU managing dynamic voltage scaling, sequenced power-up/down, and real-time battery health monitoring. Use Value: Enables 1.35-V BUCK1 and 1.1-V LDO5 operation per LP3972SQX-5810/NOPB's factory defaults, reducing active power by >15% versus fixed-output solutions. |
Use Scenario: Supplying image sensor, ISP, and memory interfaces in compact digital cameras with strict EMI limits. IC Role / Device Role / Timing Role: Multi-rail regulator providing clean, low-noise 1.8-V LDO2/LDO3 for analog front-end and 3.3-V BUCK2 for digital I/O. Use Value: SYNC pin allows synchronization of buck switching frequencies to avoid beat frequencies with image capture timing, minimizing noise coupling into analog signal paths. |
| Personal Media Player (PMP) System | Application Processor Reference Design |
|
Use Scenario: Powering audio codec, NAND flash, and ARM-based SoC in battery-operated PMPs requiring long runtime. IC Role / Device Role / Timing Role: Integrated power hub delivering 1.3-V LDO4 for I/O, 2.5-V LDO3 for peripherals, and backup-charged RTC supply. Use Value: Factory-configured LDO4 = 1.3 V and LDO3 = 2.5 V (per LP3972SQX-5810/NOPB version 5) match typical PMP memory and peripheral voltage requirements without firmware reprogramming. |
Use Scenario: Validated power solution for Freescale i.MX or TI OMAP evaluation platforms requiring flexible, software-controlled rails. IC Role / Device Role / Timing Role: Reference PMU demonstrating I²C register access, GPIO-based charger control, and fault-interrupt handling. Use Value: nRSTO and nBATT_FLT outputs provide direct hardware signaling to host processor, eliminating polling overhead and enabling deterministic power-fault response within 10 ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP3972SQX-5810 | Same silicon, no Pb-free plating - RoHS non-compliant; identical electrical specs and pinout. | Not suitable for new designs targeting RoHS compliance or lead-free assembly. | Select LP3972SQX-5810/NOPB for lead-free manufacturing; use LP3972SQX-5810 only for legacy repair or non-RoHS environments. |
| LP3972SQX-A514/NOPB | Default LDO2 = 1.8 V (D), LDO3 = 3.0 V (D), LDO4 = 3.0 V (D), BUCK2 = 3.3 V - differs in factory-set voltages and startup enable states. | Targets systems needing higher-voltage I/O rails and disabled-by-default peripherals; not drop-in for LP3972SQX-5810/NOPB's 1.3-V/2.5-V configuration. | Choose LP3972SQX-A514/NOPB only if application requires 3.0-V LDO3 and 3.3-V BUCK2; otherwise, LP3972SQX-5810/NOPB matches tighter low-voltage core rail needs. |
Compared with LP3972SQX-5810/NOPB, LP3972SQX-5810 lacks RoHS compliance but offers identical functionality, while LP3972SQX-A514/NOPB shifts key output voltages upward and changes default enable behavior - requiring firmware adaptation to maintain system stability.
Availability
LP3972SQX-5810/NOPB is available at Aetrix Electronics and suitable for smartphone power architectures, digital camera core supplies, personal media player systems, and application processor reference designs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LP3972SQX-5810/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 experience in mobile and portable power solutions.
The LP3972 product line was designed specifically for advanced application processors in handheld consumer electronics, delivering integrated, software-programmable power rails with minimal external components and robust fault protection.
FAQ
What is the factory-programmed BUCK1 output voltage for LP3972SQX-5810/NOPB?
The LP3972SQX-5810/NOPB has BUCK1 factory-programmed to 1.35 V, as specified in Table 2 (Version 5) of the SNVS468L datasheet. This voltage is set at production and can be modified via I²C register writes during system initialization. The LP3972SQX-5810/NOPB maintains ±3% output accuracy across temperature and load, supporting VCC_APPS domains in Marvell PXA and similar processors.
Does LP3972SQX-5810/NOPB support automatic switchover to backup battery for RTC operation?
Yes, LP3972SQX-5810/NOPB includes an integrated RTC LDO (LDO_RTC) that automatically switches from main battery to backup source when VIN falls below TP1 (2.9 V). Upon recovery, it transitions back at TP2 (3.0 V). The LP3972SQX-5810/NOPB delivers 2.8 V at 30 mA from either source, ensuring continuous RTC operation without software intervention or external circuitry.
What are the I²C address and timing specifications for LP3972SQX-5810/NOPB?
LP3972SQX-5810/NOPB uses a fixed 7-bit I²C slave address of 0x48 and supports high-speed mode up to 400 kHz. Its SDA/SCL pins are open-drain and require external pull-ups (2–20 kΩ). Timing parameters include tCLKLP ≥1.3 µs, tCLKHP ≥0.6 µs, and tSU ≥0.6 µs for start condition - all verified for reliable communication with ARM Cortex-M and application processor I²C controllers.
How does the backup battery charger in LP3972SQX-5810/NOPB operate?
The LP3972SQX-5810/NOPB backup charger provides constant-voltage charging with programmable termination at 3.1 V and supports lithium-manganese coin cells or supercapacitors. Charging is enabled via GPIO1/nCHG_EN or I²C command; maximum current is 190 µA at VIN = 3.6 V. The LP3972SQX-5810/NOPB includes short-circuit protection (9 mA limit) and quiescent current of 25 µA when inactive.
What thermal protection features are implemented in LP3972SQX-5810/NOPB?
LP3972SQX-5810/NOPB incorporates thermal shutdown at 160°C with 20°C hysteresis, preventing damage during sustained overload or poor PCB thermal design. Its WQFN-40 package includes an exposed thermal pad (BGND1–3 pins) and junction-to-ambient thermal resistance (RθJA) of 25°C/W under JEDEC JESD51-7 test conditions. The LP3972SQX-5810/NOPB also monitors buck converter current and disables switching if peak limit (2.4 A) is exceeded.
LP3972SQX-5810/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)
LP3972SQX-5810/NOPB FAQ
1.How can I place an order for LP3972SQX-5810/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3972SQX-5810/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 LP3972SQX-5810/NOPB reliable?
The price and inventory of LP3972SQX-5810/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3972SQX-5810/NOPB is usually 5 days.
3.What payment methods are accepted for LP3972SQX-5810/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3972SQX-5810/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3972SQX-5810/NOPB?
LP3972SQX-5810/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3972SQX-5810/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 LP3972SQX-5810/NOPB?
For technical support, including LP3972SQX-5810/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3972SQX-5810/NOPB requirements.
6.How does Aetrix verify that LP3972SQX-5810/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3972SQX-5810/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 LP3972SQX-5810/NOPB meets industry standards.
7.What is the process for return or replacement of LP3972SQX-5810/NOPB?
All LP3972SQX-5810/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3972SQX-5810/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 LP3972SQX-5810/NOPB part is unused and in its original packaging.
Return procedure for LP3972SQX-5810/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3972SQX-5810/NOPB Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
