My Inquiry
My Account
Texas Instruments LP3971SQ-7848/NOPB
- Part No.:
- LP3971SQ-7848/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LP3971SQ-7848/NOPB.pdf
- Description:
- IC PMU FOR APP PROCESSOR 40WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,904
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP3971SQ-7848/NOPB from Texas Instruments is a programmable power management unit (PMU) for advanced application processors, integrating three 1.6A buck regulators (BUCK1–BUCK3), six LDOs-including 30mA RTC LDO-and a backup battery charger. Default output voltages are BUCK1=1.2V, BUCK2=1.2V, BUCK3=3.0V, LDO1=3.0V, LDO2=2.6V, LDO3=3.3V, LDO4=1.2V, LDO5=1.8V, and LDO_RTC=2.8V. It operates from 2.7–5.5V input and targets low-power handheld systems.
For engineers reviewing the LP3971SQ-7848/NOPB datasheet, LP3971SQ-7848/NOPB pinout, LP3971SQ-7848/NOPB application, or LP3971SQ-7848/NOPB equivalent, this PMU supports I²C-controlled dynamic voltage scaling, thermal/overcurrent protection, and seamless main-to-backup battery switchover-critical for PDA phones, smart phones, and media players requiring multi-rail sequencing and runtime power optimization.
Technical Context
The LP3971SQ-7848/NOPB implements three synchronous buck converters with internal 240mΩ PFET and 200mΩ NFET switches, operating at 2MHz fixed frequency or synchronized to external 10.4–15.6MHz clock via SYNC pin. Each buck supports programmable VOUT from 0.725V to 3.3V with ±3% accuracy and up to 95% efficiency at 500mA load.
Six LDOs include one 30mA RTC LDO with automatic main/backup battery switchover (threshold 2.8V/3.1V hysteresis), four 150mA LDOs (LDO2–LDO4), one 300mA LDO1, and one 370mA LDO5-all featuring ±3% output accuracy, <100mV dropout (typ), and 45dB PSRR at 10kHz. All regulators are software-configurable via high-speed I²C interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 1.6A per channel (BUCK1–BUCK3); enables core voltage regulation for application processors like Marvell PXA. |
| LDO Output Accuracy | ±3% over −40°C to +125°C; ensures stable I/O and peripheral rail compliance in temperature-varying environments. |
| I²C Interface Speed | High-speed mode (up to 400kHz); allows real-time dynamic voltage management during processor DVFS transitions. |
| RTC LDO Switchover | Automatic main-to-backup battery transfer at 2.8V (falling) / 3.1V (rising); maintains RTC operation without external supervision. |
| Package | 40-pin WQFN (5mm × 5mm, RSB0040A); supports high-density portable PCB layouts with exposed thermal pad. |
| Thermal Protection | 160°C shutdown with 20°C hysteresis; prevents permanent damage during sustained overload or poor heatsinking. |
| Backup Charger Current | Programmable via I²C; supports lithium-manganese coin cell or supercapacitor charging with 2.91–3.1V termination. |
Pinout & Package
LP3971SQ-7848/NOPB uses a 40-pin WQFN package (Package Code: RSB0040A), 5mm × 5mm body with 0.4mm pitch and exposed thermal pad (BGND1,2,3). Pin 1 is marked by circle on top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWR_ON | Active-HI push-button input | Initiates system power-on/off sequence; controls EXT_WAKEUP pulse and register 0x02 status flags. |
| EXT_WAKEUP | Open-drain output | 10ms pulse to CPU upon wake events (PWR_ON/nTEST_JIG/SPARE); signals interrupt source via register 0x02. |
| FB1–FB3 | Analog feedback inputs | Resistor-divider nodes for precise buck output voltage setting; enable ±3% regulation accuracy. |
| VIN Buck1–3 | Main battery input to bucks | Accepts 2.7–5.5V; shared input with LDO1–3; requires local 10µF ceramic input capacitance per buck. |
| VOUT LDO1–5 / LDO_RTC | Regulated power outputs | Deliver 300mA (LDO1), 150mA (LDO2–4), 370mA (LDO5), 30mA (LDO_RTC); all with <100mV dropout and 45dB PSRR. |
| GPIO1/nCHG_EN | Configurable I/O | Enables/disables backup battery charging when asserted; toggled via I²C or driven externally. |
| SCL/SDA | I²C bidirectional interface | Supports high-speed mode (400kHz); used for VOUT programming, enable control, fault monitoring, and register access. |
| nRSTO | Active-low reset output | Drives processor reset line; asserts on internal fault (thermal/overcurrent) or nRSTI assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Triple 1.6A Synchronous Bucks | Internal 240mΩ PFET + 200mΩ NFET switches; eliminates need for external MOSFETs and reduces board area by >30%. |
| RTC Battery Switchover Logic | Hardware-automated transition between main battery and backup cell at 2.8V/3.1V thresholds; no firmware intervention required. |
| I²C Programmable Voltage Scaling | Full VOUT configuration (0.725–3.3V) and enable/disable control per regulator; enables dynamic core voltage adjustment during DVFS. |
| Integrated Backup Charger | Programmable current and 2.91–3.1V termination; supports Li-MnO₂ coin cells and supercapacitors without external charge IC. |
| Multi-Source Enable Control | Dedicated SYS_EN and PWR_EN inputs allow independent activation of high- and low-voltage domain supplies per application processor requirements. |
Applications
| Smartphone Baseband Power | PDA Application Processor Sequencing |
|---|---|
|
Use Scenario: Powering Marvell PXA27x baseband SoC with dynamically scaled core (1.2V), memory I/O (2.6V), and RF interface (3.0V) rails. IC Role / Device Role / Timing Role: LP3971SQ-7848/NOPB provides sequenced, I²C-programmed buck and LDO outputs with real-time voltage adjustment during sleep/wake transitions. Use Value: Enables 20% reduction in active power consumption via DVFS while maintaining sub-100µs response to voltage change commands. |
Use Scenario: Supplying Samsung S3C2440-based PDA with separate 3.3V I/O, 3.0V LCD, 1.2V core, and RTC backup rails. IC Role / Device Role / Timing Role: LP3971SQ-7848/NOPB delivers eight regulated outputs with hardware-controlled startup timing and fault isolation. Use Value: Eliminates discrete LDO/buck combinations; reduces BOM count by 12 components and improves system-level power-up reliability. |
| Digital Camera Sensor Cluster | Industrial Handheld HMI |
|
Use Scenario: Powering CMOS image sensor (1.8V), ISP (1.2V), flash LED driver (3.0V), and SDIO interface (2.8V) in compact camera module. IC Role / Device Role / Timing Role: LP3971SQ-7848/NOPB supplies low-noise, fast-transient LDOs and high-efficiency bucks with independent enable control per subsystem. Use Value: Achieves <10mV ripple on sensor rails and <50µs load transient recovery-critical for artifact-free image capture. |
Use Scenario: Supporting Freescale i.MX28-based ruggedized HMI with extended temperature operation (−40°C to +85°C). IC Role / Device Role / Timing Role: LP3971SQ-7848/NOPB delivers thermally robust power (160°C shutdown) and wide-input (2.7–5.5V) operation across battery and adapter sources. Use Value: Ensures uninterrupted RTC and SRAM retention during brownout via automatic backup battery switchover and 30mA LDO_RTC. |
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 1.5A bucks + 5 LDOs; no integrated backup battery charger; I²C address fixed (no configurable slave ID). | Lacks RTC battery switchover logic and charger; requires external circuitry for backup power management. | Select when backup charging is unnecessary and lower cost is prioritized over feature completeness. |
| MAX8649ETE+ | Dual 1.5A bucks + 4 LDOs; 1.2MHz switching frequency; no RTC LDO or battery switch; supports only 2.7–5.5V VIN. | Cannot replace LP3971SQ-7848/NOPB in RTC-critical designs; lacks hardware battery switchover and charger control. | Choose for simpler dual-rail applications where RTC autonomy and backup charging are handled externally. |
Compared with TPS65023RSBR and MAX8649ETE+, LP3971SQ-7848/NOPB uniquely integrates RTC battery switchover, programmable backup charging, and eight independently controllable outputs-making it the only option for space-constrained, battery-backed portable systems requiring full autonomous power management.
Availability
LP3971SQ-7848/NOPB is available at Aetrix Electronics and suitable for smartphone baseband power, PDA application processor sequencing, digital camera sensor clusters, and industrial handheld HMI requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LP3971SQ-7848/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 and embedded processing technologies, with decades of expertise in power management IC design for portable and industrial applications.
The LP3971 product line was engineered specifically for advanced application processors-including Marvell PXA, Freescale i.MX, and Samsung S3C families-delivering integrated, I²C-programmable power solutions that reduce system complexity and improve energy efficiency in handheld devices.
FAQ
What are the default output voltages configured for LP3971SQ-7848/NOPB?
The LP3971SQ-7848/NOPB is factory-configured with BUCK1=1.2V, BUCK2=1.2V, BUCK3=3.0V, LDO1=3.0V, LDO2=2.6V, LDO3=3.3V, LDO4=1.2V, LDO5=1.8V, and LDO_RTC=2.8V. These defaults are set via internal OTP and can be modified in real time using the I²C interface. The LP3971SQ-7848/NOPB datasheet Table "Default Voltage Options" confirms these values for version "7848".
Does LP3971SQ-7848/NOPB support automatic switchover between main and backup batteries?
Yes, LP3971SQ-7848/NOPB includes dedicated hardware logic for automatic RTC LDO switchover: it transfers from main battery to backup cell at 2.8V (falling) and reverts at 3.1V (rising), with hysteresis preventing oscillation. This function operates independently of firmware and requires no I²C command-fully implemented in the LP3971SQ-7848/NOPB silicon.
Can LP3971SQ-7848/NOPB be synchronized to an external clock source?
Yes, LP3971SQ-7848/NOPB supports external clock synchronization via the SYNC pin. When driven with a 10.4–15.6MHz signal (e.g., from a system PLL), all three buck regulators lock to that frequency-reducing beat frequencies and EMI in noise-sensitive applications. This capability is documented in the LP3971SQ-7848/NOPB Electrical Characteristics table under "Sync Mode Clock Frequency".
What is the maximum output current capability of each LDO in LP3971SQ-7848/NOPB?
LP3971SQ-7848/NOPB provides LDO1=300mA, LDO2=150mA, LDO3=150mA, LDO4=150mA, LDO5=370mA, and LDO_RTC=30mA (or 10mA in tracking mode). These values are specified in the LP3971SQ-7848/NOPB Supply Specification table and validated across −40°C to +125°C junction temperature.
Is LP3971SQ-7848/NOPB pin-compatible with other variants in the LP3971 family?
Yes, all LP3971 variants-including LP3971SQ-7848/NOPB-share identical 40-pin WQFN (RSB0040A) packaging and pinout. Differences are limited to factory-programmed default voltages and OTP configuration bits; no PCB layout change is required when substituting within the LP3971 family.
LP3971SQ-7848/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)
LP3971SQ-7848/NOPB FAQ
1.How can I place an order for LP3971SQ-7848/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3971SQ-7848/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 LP3971SQ-7848/NOPB reliable?
The price and inventory of LP3971SQ-7848/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3971SQ-7848/NOPB is usually 5 days.
3.What payment methods are accepted for LP3971SQ-7848/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3971SQ-7848/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3971SQ-7848/NOPB?
LP3971SQ-7848/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3971SQ-7848/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 LP3971SQ-7848/NOPB?
For technical support, including LP3971SQ-7848/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3971SQ-7848/NOPB requirements.
6.How does Aetrix verify that LP3971SQ-7848/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3971SQ-7848/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 LP3971SQ-7848/NOPB meets industry standards.
7.What is the process for return or replacement of LP3971SQ-7848/NOPB?
All LP3971SQ-7848/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3971SQ-7848/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 LP3971SQ-7848/NOPB part is unused and in its original packaging.
Return procedure for LP3971SQ-7848/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3971SQ-7848/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…
