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Texas Instruments LP3921SQ/NOPB
- Part No.:
- LP3921SQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LP3921SQ/NOPB.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 32WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,500
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Product details
Overview
LP3921SQ/NOPB from Texas Instruments is a fully integrated battery charger management and regulator unit with a Boomer™ audio amplifier, designed for CDMA cellular handsets. It integrates a thermally regulated Li-Ion linear charger (50–950 mA), seven low-noise LDOs (300/150/80 mA outputs), and a 1.1 W differential Class-D audio amplifier driving 8Ω BTL loads with <1% THD+N.
For engineers reviewing the LP3921SQ/NOPB datasheet, LP3921SQ/NOPB pinout, LP3921SQ/NOPB application, or LP3921SQ/NOPB equivalent, this device supports I²C-controlled charging, programmable LDO voltages (1.5–3.3 V), thermal shutdown, UVLO, and capacitor-free audio output - critical for compact, low-power mobile power management designs.
Technical Context
The LP3921SQ/NOPB implements a CC/CV linear charging architecture with pre-charge, full-rate, maintenance, and safety timer modes. Its charge current is thermally regulated to maintain optimal junction temperature (TJ = 115°C) across ambient conditions, and termination voltage is programmable (4.1–4.4 V) with ±0.35% typical accuracy.
All seven LDOs feature high PSRR (65 dB @ 10 kHz), ultra-low output noise (45 µVRMS, 10 Hz–100 kHz), and fast start-up (≤170 µs). The Boomer audio amplifier uses fully differential architecture, eliminates output coupling capacitors and snubber networks, and delivers 1.1 W into 8Ω with <1% THD+N at 1 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charger Current Range | 50–950 mA in 50 mA steps; enables precise Li-Ion charge rate tuning per battery capacity and thermal constraints |
| LDO Output Count & Types | 7 total: two 300 mA (CORE/DIGI), three 150 mA (RX/TX/GP), two 80 mA (ANA/TCXO); supports multi-rail system power domains |
| Audio Output Power | 1.1 W continuous into 8Ω BTL load at <1% THD+N; eliminates need for external coupling caps in space-constrained handsets |
| I²C Interface | Standard-mode compatible (100 kHz), enabling full register control of charge parameters, LDO enable/voltage, and audio functions |
| Package | 32-pin 5 × 5 mm WQFN with exposed thermal pad; θJA = 30°C/W on JEDEC 4-layer board for efficient thermal dissipation |
| Input Voltage Range | CHG_IN: 4.5–6.0 V (DC adapter/USB); VIN1/VIN2/BATT/VDD: 3.0–5.5 V; ensures compatibility with standard mobile power sources |
| LDO Accuracy | ±2% typical output voltage accuracy; guarantees stable core/digital/analog rail regulation under load and temperature variation |
Pinout & Package
LP3921SQ/NOPB is housed in a space-efficient 32-pin WQFN (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad for enhanced power dissipation. Pin functions are validated per TI SNVS580A Rev. May 2013 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 13–16 | LDO Outputs (LDO6–LDO1) | Seven regulated power rails: CORE (1.8 V/300 mA), DIGI (3.0 V/300 mA), ANA (3.0 V/80 mA), TCXO (3.0 V/80 mA), RX/TX/GP (3.0 V/150 mA each) |
| 2, 26, 32, 4, 17 | Enable & Input Pins (TX_EN, TCXO_EN, RX_EN, VIN2, VIN1) | Digital enables for LDO4–LDO6; dual battery inputs (VIN1 for CORE/DIGI, VIN2 for remaining LDOs) |
| 6, 8 | Audio Differential Outputs (OUT+, OUT−) | Capacitor-free BTL audio outputs; drive 8Ω directly without DC-blocking caps or bootstrap networks |
| 9, 10 | Audio Differential Inputs (IN+, IN−) | Fully differential analog input stage; rejects common-mode noise and improves SNR in noisy RF environments |
| 19, 20 | I²C Interface (SDA, SCL) | Open-drain SDA with 1.5 kΩ pull-up required; enables full configuration and status readback of all functional blocks |
| 21–25, 27–31 | System Control & Monitoring (BATT, CHG_IN, PWR_ON, IMON, PS_HOLD, HF_PWR, ACOK_N, RESET_N, PON_N) | Real-time charge monitoring (IMON = 2.47 mV/mA), AC presence detection, power sequencing, and thermal-safe reset signaling |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Li-Ion Charger with Thermal Regulation | Maintains optimal charge current across ambient temperatures via internal junction temperature sensing (TJ = 115°C trip), avoiding external thermal sensors or layout-dependent derating |
| Seven Low-Noise LDOs with Programmable Voltages | Each LDO supports up to 16 voltage options (1.5–3.3 V); enables dynamic voltage scaling for CORE/DIGI/ANA domains while maintaining PSRR >65 dB |
| Capacitor-Free Boomer Audio Amplifier | Eliminates four external coupling capacitors and snubber networks; reduces BOM count and PCB area in handset audio subsystems |
| I²C-Controlled Power Sequencing | Enables precise startup order (LDO1 → LDO2 → LDO3), independent enable/disable of LDO1/LDO3/LDO7, and real-time status reporting for system-level power management |
| Charge Current Monitor Output (IMON) | Analog voltage output (2.47 mV/mA) provides direct, calibrated feedback for closed-loop charge control or battery health monitoring without ADC overhead |
Applications
| CDMA Handset Power Management | Low-Power Wireless Handset Audio |
|---|---|
Use Scenario: Compact CDMA handset requiring simultaneous Li-Ion charging, multi-rail power delivery (CORE/DIGI/ANA), and loudspeaker audio playback. IC Role / Device Role / Timing Role: Central PMU integrating charger, 7 LDOs, and audio amplifier - replaces discrete power ICs and audio codec in single-chip solution. Use Value: Reduces component count by ≥12 parts (vs. discrete LDOs + charger + Class-D amp), cuts PCB area by >35%, and eliminates 4 audio coupling capacitors. |
Use Scenario: Battery-powered wireless handset needing high-fidelity speaker output with minimal quiescent power and no DC-blocking caps. IC Role / Device Role / Timing Role: Audio subsystem driver delivering 1.1 W into 8Ω BTL load with <1% THD+N at 1 kHz, synchronized to baseband processor via I²C. Use Value: Enables capacitor-free audio path, reducing ESR-related distortion and improving low-frequency response below 100 Hz. |
| Handheld Information Appliance Power Domain Control | Personal Media Player System-on-Chip Support |
Use Scenario: Portable media player requiring isolated, low-noise power rails for RF transceiver (TCXO), baseband (CORE), memory (DIGI), and analog front-end (ANA). IC Role / Device Role / Timing Role: Multi-output regulator supplying 7 independent, PSRR-optimized rails - LDO1 (1.8 V/300 mA) powers SoC core; LDO4 (3.0 V/80 mA) supplies TCXO clock generator. Use Value: Achieves >65 dB PSRR at 10 kHz across all LDOs, preventing switching noise from digital domains from corrupting sensitive RF/analog signals. |
Use Scenario: Personal media player with integrated audio playback, requiring seamless transition between headphone and speaker output paths. IC Role / Device Role / Timing Role: Dual-role PMU providing regulated power to media SoC and driving 8Ω speaker via Boomer amplifier with pop/click suppression circuitry. Use Value: Integrated pop/click suppression eliminates audible artifacts during power-up/down and audio enable transitions - critical for user experience. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger and multi-LDO power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Single-input Li-Ion charger only (no LDOs/audio); 1 A max charge current; no I²C interface - uses pin-strapping for configuration | Suitable for simpler systems needing only charging, not multi-rail regulation or audio | Select when audio amplification and 7-channel LDO integration are unnecessary; requires external LDOs for system rails |
| TPS65023RSBR | Three buck converters + five LDOs; no integrated charger or audio amplifier; I²C interface; 2.7–5.5 V input | Targets broader portable applications (e.g., PDAs) where high-efficiency DC/DC conversion is prioritized over linear charging | Choose when higher efficiency (>90%) and lower thermal load are critical; adds complexity due to external charger requirement |
Compared with LP3921SQ/NOPB, BQ24075RGTR lacks LDOs and audio, requiring ≥7 additional components for equivalent functionality; TPS65023RSBR offers DC/DC efficiency but omits charging and audio, increasing BOM and design effort for CDMA handset use cases.
Availability
LP3921SQ/NOPB is available at Aetrix Electronics and suitable for CDMA handset design, low-power wireless terminal development, and handheld information appliance production requiring stable component supply, long-lifecycle support, and automotive-grade reliability validation.
Supply support for LP3921SQ/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 solutions, with decades of expertise in mobile power ICs and audio amplifiers.
The LP3921SQ/NOPB belongs to TI's Boomer™-integrated PMU product line, engineered specifically for CDMA and low-power wireless handsets requiring tightly coupled battery charging, multi-rail LDO regulation, and capacitor-free audio amplification in minimal footprint.
FAQ
What is the maximum programmable charge current for LP3921SQ/NOPB?
The LP3921SQ/NOPB supports a fully programmable Li-Ion charge current from 50 mA to 950 mA in 50 mA increments via its I²C interface. The default full-rate current is 100 mA, and the pre-charge current is fixed at 50 mA. This range allows precise adaptation to battery capacity and thermal constraints in CDMA handset designs.
Does LP3921SQ/NOPB require external coupling capacitors for its audio amplifier?
No, the LP3921SQ/NOPB Boomer audio amplifier is fully differential and capacitor-free - it drives 8Ω BTL loads directly without output coupling capacitors, snubber networks, or bootstrap capacitors. This eliminates four external components and associated ESR-related distortion, making it ideal for space-constrained mobile audio applications.
How many LDO outputs does LP3921SQ/NOPB provide, and what are their current ratings?
The LP3921SQ/NOPB integrates seven independent LDO regulators: two rated at 300 mA (LDO1 CORE, LDO2 DIGI), three at 150 mA (LDO5 RX, LDO6 TX, LDO7 GP), and two at 80 mA (LDO3 ANA, LDO4 TCXO). All support programmable output voltages from 1.5 V to 3.3 V via I²C.
What package type and thermal performance does LP3921SQ/NOPB use?
LP3921SQ/NOPB is packaged in a 32-pin WQFN (5 mm × 5 mm, 0.5 mm pitch) with an exposed thermal pad. Its junction-to-ambient thermal resistance (θJA) is 30°C/W on a JEDEC 4-layer board, enabling robust thermal regulation during high-current charging and audio operation without external heatsinking.
Can LP3921SQ/NOPB operate from a USB power source?
Yes, LP3921SQ/NOPB supports USB-compatible charging with programmable current limits of 100 mA (low-power USB) and 450 mA (high-power USB), selectable via I²C. Its CHG_IN input accepts 4.5–6.0 V, aligning with USB 2.0/3.0 VBUS specifications when used with appropriate upstream regulation.
LP3921SQ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Boomer®
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Temperature, Reverse Current
- Charge Current - Max:
- 950mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-WQFN (5x5)
LP3921SQ/NOPB FAQ
1.How can I place an order for LP3921SQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3921SQ/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 LP3921SQ/NOPB reliable?
The price and inventory of LP3921SQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3921SQ/NOPB is usually 5 days.
3.What payment methods are accepted for LP3921SQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3921SQ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3921SQ/NOPB?
LP3921SQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3921SQ/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 LP3921SQ/NOPB?
For technical support, including LP3921SQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3921SQ/NOPB requirements.
6.How does Aetrix verify that LP3921SQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3921SQ/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 LP3921SQ/NOPB meets industry standards.
7.What is the process for return or replacement of LP3921SQ/NOPB?
All LP3921SQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3921SQ/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 LP3921SQ/NOPB part is unused and in its original packaging.
Return procedure for LP3921SQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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