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Texas Instruments LP3923TL-VB/NOPB
- Part No.:
- LP3923TL-VB/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 30-WFBGA
- Datasheet:
-
LP3923TL-VB/NOPB.pdf
- Description:
- PMU+CHGR+8 LDO+1 BUCK 30USMD
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LP3923TL-VB/NOPB from Texas Instruments is a fully integrated cellular phone power management unit (PMU) combining an I²C-programmable Li-ion battery charger, one synchronous buck regulator (700 mA), and eight low-noise LDOs-including two LILO-type LDOs for pre-regulated supply-targeting CDMA handset baseband processor power domains. It operates from 3.0–5.5 V input, delivers 3.0 V/300 mA outputs with ±2% accuracy and 135 mV dropout, and supports thermal regulation, 28 V OVP, and I²C-based dynamic voltage control.
For engineers reviewing the LP3923TL-VB/NOPB datasheet, LP3923TL-VB/NOPB pinout, LP3923TL-VB/NOPB application in CDMA baseband power sequencing, or LP3923TL-VB/NOPB equivalent for multi-rail PMU replacement, this device offers verified integration of charging, buck conversion, and eight independently controllable LDOs in a compact 30-bump DSBGA package-enabling single-chip power architecture for space-constrained mobile systems.
Technical Context
The LP3923TL-VB/NOPB implements a thermally regulated linear Li-ion charger with programmable CC/CV termination (4.2 V default), 50–1200 mA charge current, and integrated FET, reverse-current blocking diode, and current monitor (IMON). Its buck regulator operates in auto PFM/PWM mode at 2 MHz, delivering up to 700 mA with external feedback for user-defined output voltage (e.g., 1.8 V default).
All eight LDOs are digitally controlled via I²C: LDO1/LDO2 are LILO types whose input source (VBATT or buck output) and default output voltage (3.0 V or 1.8 V) depend on SEL pin state; LDO3–LDO8 include A-type (low-noise, 10 µV RMS) and D-type regulators with enable pins (RX_EN, TX_EN, TCXO_EN) and fixed 3.0 V outputs rated up to 300 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 5.5 V for VBATT inputs; 4.5 V to 6.8 V for CHG_IN - enables direct USB/AC adapter connection without external overvoltage protection |
| Charging Current Range | 50 mA to 1200 mA in 50 mA steps - supports flexible battery capacity scaling and thermal-aware fast-charge profiles |
| Buck Regulator Output | 700 mA typical, 2 MHz switching frequency - delivers high-efficiency digital rail with low-inductance 2.2 µH inductor support |
| LDO Output Accuracy | ±2% typical (±3% max) - ensures stable core, RF, and peripheral voltage domains under load and temperature variation |
| LDO Dropout Voltage | 135 mV @ 300 mA (LDO1–LDO3); 60 mV @ 80 mA (LDO4) - minimizes headroom loss for battery-powered operation |
| Output Noise (A-type) | 10 µVRMS (10 Hz–100 kHz) - meets stringent RF section noise requirements for TCXO, RX, and TX supplies |
| Interface Protocol | I²C-compatible serial interface (SDA/SCL) - enables real-time LDO on/off control, voltage programming, and status readback |
| Package | 30-bump, 3.0 mm × 2.5 mm DSBGA - provides ultra-compact footprint for thin mobile PCBs with 0.4 mm pitch |
Pinout & Package
LP3923TL-VB/NOPB uses a 30-bump, 3.0 mm × 2.5 mm DSBGA package with 0.4 mm pitch and bottom-side ball layout. Thermal performance is characterized at θJA = 39°C/W on JEDEC-standard PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A5, B1, B5, C1, C5, D1, E1, F5 | LDO outputs (LDO4–LDO8, LDO2, LDO3, LDO1, SW, CHG_IN) | Eight regulated power outputs plus buck switch node and charger input - each assigned dedicated bump for low-impedance routing and noise isolation |
| B2–B4, D2, D3, E2–E3, E4, F4 | Digital control inputs/outputs (TCXO_EN, RX_EN, TX_EN, SEL, PON_N, HF_PWR, PWR_ON, SCL, ACOK_N) | Enable, sequencing, and status signaling - includes internal pull-downs (500 kΩ) on HF_PWR/PWR_ON and open-drain outputs (ACOK_N, SDA) |
| C4, F3 | Analog monitoring/feedback (IMON, FB) | Charging current analog monitor (IMON) and buck feedback (FB) - require precision external resistors (e.g., RFB1=390 kΩ, RFB2=150 kΩ) for voltage setting |
| C5, D5, E5, F1–F2 | Power and ground connections (LDO8, GND, BATT, VINB, GNDB) | Dedicated power balls per domain - separate GNDB for buck, shared GND for logic, and isolated BATT for battery sensing and delivery |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Li-ion charger with 28 V OVP | Eliminates need for external overvoltage protection circuitry when connected to AC adapters or USB ports |
| Two LILO LDOs (LDO1/LDO2) with SEL pin | Enables dual-supply flexibility: 3.0 V from battery or 1.8 V from buck - optimizing efficiency and noise for core logic rails |
| A-type LDOs with 10 µVRMS noise | Provides ultra-low-noise 3.0 V supply for TCXO, RF receivers, and transmitters without additional filtering |
| Auto PFM/PWM buck mode switching | Maintains >88% efficiency at light loads (5 mA) and >90% at full load (300 mA), extending battery life across usage states |
| Thermal shutdown with early warning alarm | Prevents permanent damage during high-power charging or LDO overload while allowing graceful system response |
| I²C programmability of all LDOs and charger | Supports dynamic voltage scaling, power-state sequencing, and real-time fault diagnostics in production firmware |
Applications
| Baseband Processor Power | RF Front-End Supply |
|---|---|
Use Scenario: Powering ARM9/ARM11 baseband processor cores, memory interfaces, and digital peripherals in CDMA handsets. IC Role / Device Role / Timing Role: LP3923TL-VB/NOPB delivers three independent 3.0 V/300 mA LDOs (LDO1–LDO3) and a 1.8 V/700 mA buck rail, with I²C-controlled sequencing and voltage selection. Use Value: Reduces external component count by integrating eight regulated rails and eliminates discrete charge management ICs. |
Use Scenario: Supplying low-noise bias to TCXO, RX mixer, and TX power amplifier stages in cellular RF modules. IC Role / Device Role / Timing Role: LP3923TL-VB/NOPB provides A-type LDOs (LDO4–LDO7) with 10 µVRMS noise and 75 dB PSRR at 10 kHz for sensitive analog timing circuits. Use Value: Meets RF section phase-noise and spurious emission requirements without adding ferrite beads or LC filters. |
| USB/AC Charging Interface | Vibrator & Peripheral Power |
Use Scenario: Managing Li-ion battery charging from USB 2.0 (5 V) or wall adapter (5–6.8 V) inputs in portable handsets. IC Role / Device Role / Timing Role: LP3923TL-VB/NOPB integrates charger FET, current sense, thermal regulation, and 28 V OVP - requiring only CHG_IN, BATT, and IMON connections. Use Value: Achieves safe, programmable CC/CV charging with end-of-charge detection and maintenance mode, reducing BOM cost by >40% vs. discrete solutions. |
Use Scenario: Driving haptic feedback vibrators and enabling low-power peripherals (GPS, camera flash, sensors) in sleep/wake cycles. IC Role / Device Role / Timing Role: LP3923TL-VB/NOPB supplies 3.0 V/150 mA to LDO8 and enables/disables it via I²C or dedicated SI control for precise power gating. Use Value: Enables microsecond-level peripheral power control and reduces standby current to 130 µA in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSLR | Three buck converters + six LDOs; no integrated Li-ion charger; 48-pin QFN package | Suitable for systems requiring higher buck current (up to 1.5 A) but lacking charger functionality - requires external charging IC | Select when primary need is high-efficiency DC/DC conversion without battery management |
| MAX8649ETE+ | Single buck + five LDOs + integrated Li-ion charger; 20-pin TQFN; lower LDO count and current (200 mA max) | Targeted at simpler GSM/GPRS handsets with fewer power domains - lacks LILO LDOs and TCXO-specific low-noise rail | Select for cost-sensitive designs with ≤5 regulated rails and basic charging needs |
Compared with TPS65023RSLR and MAX8649ETE+, the LP3923TL-VB/NOPB uniquely combines eight LDOs (including two LILO types), a 700 mA buck, and a fully integrated 28 V-tolerant charger in a 3.0 × 2.5 mm DSBGA - making it the only option for compact CDMA PMUs requiring simultaneous RF noise control, baseband sequencing, and robust charging.
Availability
LP3923TL-VB/NOPB is available at Aetrix Electronics and suitable for CDMA handset design, RF module integration, and battery-powered embedded communication systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP3923TL-VB/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 power solutions and automotive-grade reliability.
The LP3923TL-VB/NOPB belongs to TI's Cellular Power Management Unit product line, designed specifically for CDMA handset architectures requiring tightly coordinated battery charging, multi-rail LDO regulation, and RF-optimized low-noise supply generation in minimal PCB area.
FAQ
What is the default output voltage configuration of LP3923TL-VB/NOPB's LDO1 and LDO2?
The LP3923TL-VB/NOPB's LDO1 and LDO2 default output voltage depends on the SEL pin state: when SEL = GND, both deliver 3.0 V from VBATT; when SEL = VBATT, both deliver 1.8 V from the buck regulator output. This LILO configuration allows dynamic selection between high-efficiency buck-derived rails and battery-direct rails based on system power state.
Does LP3923TL-VB/NOPB support programmable battery termination voltage?
Yes, LP3923TL-VB/NOPB supports four programmable battery termination voltages: 4.1 V, 4.2 V (default), 4.3 V, and 4.4 V. These are configured via I²C register writes and affect the transition from constant-current to constant-voltage charging phase, enabling optimization for different Li-ion cell chemistries and aging profiles.
How does the buck regulator of LP3923TL-VB/NOPB achieve high efficiency at light loads?
The LP3923TL-VB/NOPB buck regulator automatically switches to PFM mode at low output currents, reducing switching losses and maintaining >88% efficiency at 5 mA load. This mode is transparent to the user and transitions seamlessly to PWM mode above ~20 mA, ensuring optimal efficiency across the full 0–700 mA operating range.
What is the purpose of the IMON pin on LP3923TL-VB/NOPB?
The IMON pin on LP3923TL-VB/NOPB provides an analog voltage proportional to the instantaneous charging current, enabling real-time monitoring and closed-loop charge control in host firmware. Its output scales linearly (e.g., 1 V per 1 A), allowing accurate current measurement without external sense resistors or amplifiers.
Can LP3923TL-VB/NOPB be used in systems requiring 1.8 V core supply for baseband processors?
Yes, LP3923TL-VB/NOPB can deliver a 1.8 V core supply either through its buck regulator (default 1.8 V output when VINB = VBATT) or via LDO1/LDO2 in LILO mode (SEL = VBATT). The buck output is rated for 700 mA and supports external resistor feedback for fine-tuning, making it suitable for powering ARM9/ARM11 processor cores directly.
LP3923TL-VB/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Applications:
- Cellular, CDMA Handset
- Current - Supply:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 30-DSBGA
LP3923TL-VB/NOPB FAQ
1.How can I place an order for LP3923TL-VB/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3923TL-VB/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 LP3923TL-VB/NOPB reliable?
The price and inventory of LP3923TL-VB/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3923TL-VB/NOPB is usually 5 days.
3.What payment methods are accepted for LP3923TL-VB/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3923TL-VB/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3923TL-VB/NOPB?
LP3923TL-VB/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3923TL-VB/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 LP3923TL-VB/NOPB?
For technical support, including LP3923TL-VB/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3923TL-VB/NOPB requirements.
6.How does Aetrix verify that LP3923TL-VB/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3923TL-VB/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 LP3923TL-VB/NOPB meets industry standards.
7.What is the process for return or replacement of LP3923TL-VB/NOPB?
All LP3923TL-VB/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3923TL-VB/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 LP3923TL-VB/NOPB part is unused and in its original packaging.
Return procedure for LP3923TL-VB/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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