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Texas Instruments LP3917RL-N/NOPB
- Part No.:
- LP3917RL-N/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 49-WFBGA, DSBGA
- Datasheet:
-
LP3917RL-N/NOPB.pdf
- Description:
- IC PMU CDMA W/CHARGER 49USMDXT
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
LP3917RL-N/NOPB from Texas Instruments is a highly integrated Power Management Unit (PMU) designed specifically for CDMA cellular handsets. It integrates two synchronous buck regulators (800 mA and 600 mA), nine low-noise LDOs (35 µV typ noise, 2% output accuracy), a USB 2.0 transceiver (12 Mbps), two comparators, and a high-speed serial interface - all in a single 49-bump DSBGA package. It supports RF section power delivery, baseband processor domain control, and accessory detection.
For engineers reviewing the LP3917RL-N/NOPB datasheet, LP3917RL-N/NOPB pinout, LP3917RL-N/NOPB application, or LP3917RL-N/NOPB equivalent, key selection considerations include its dual-buck + 9-LDO architecture, thermal shutdown with early warning, PFM/PWM auto-switching for light-load efficiency, ultra-low LDO noise for RF supply, and interrupt-driven status reporting to reduce baseband polling overhead.
Technical Context
The LP3917RL-N/NOPB implements a multi-rail PMU architecture with dedicated power domains for baseband processor, memory, RF (TX/RX/SYNTH/TCXO), peripherals (UIM, CAM/KP, LCD), and vibration motor. Its two buck regulators operate at 2 MHz with 2.2 µH inductors and support automatic PFM mode below ~100 mA load to maintain >85% efficiency down to microamp loads.
Nine LDOs are individually programmable via serial interface and deliver stable outputs including 1.375 V/1.875 V (MSMC), 1.8 V (MSME), 2.6–2.85 V (RF & peripheral rails), and 2.85 V @ 80 mA (TCXO). Two comparators monitor external accessories (e.g., earplug insertion), while battery voltage monitoring (BMON) and thermal shutdown with alarm provide system-level protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0–5.5 V - Supports single-cell Li-ion battery input with headroom for charging variations and transient spikes. |
| Buck Regulator Outputs | 800 mA @ 1.375/1.875 V and 600 mA @ 1.8 V - Powers core baseband and memory subsystems with synchronous rectification. |
| LDO Count & Noise | 9 LDOs, 35 µV typ RMS noise - Enables clean biasing of sensitive RF circuitry (e.g., synthesizers, TX chains). |
| Output Voltage Accuracy | ±2% (typ) on all LDOs - Ensures reliable operation of voltage-sensitive digital and analog blocks without margin overdesign. |
| USB Transceiver | USB 2.0 Full-Speed (12 Mbps) compliant - Provides direct connectivity to host without external PHY; supports suspend/resume signaling. |
| Package | DSBGA-49 (3.5 × 3.5 mm, 0.5 mm pitch) - Enables ultra-compact placement in space-constrained handset PCB layouts. |
| Thermal Protection | Thermal shutdown with early-warning IRQ_N signal - Allows firmware to throttle before critical junction temperature is reached. |
Pinout & Package
LP3917RL-N/NOPB is housed in a 49-bump ultra-thin DSBGA (Die Size Ball Grid Array) package, marked "V03", with 0.5 mm ball pitch and JEDEC-standard MSL-3 moisture sensitivity rating. The package supports fine-pitch routing and minimal board area usage in mobile phone mainboards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW_B1, SW_B2 | Buck Switch Node Outputs | Drive external 2.2 µH inductors; require low-ESR ceramic output capacitors for stable 2 MHz switching. |
| FB_B1, FB_B2 | Buck Feedback Inputs | Resistive divider inputs for precise output voltage setting; enable dynamic voltage scaling via serial interface. |
| LDO1–LDO9 | Regulated Output Terminals | Individually controllable LDO outputs; each supports soft-start and independent enable/disable via serial command. |
| SCL, SDA | I²C-Compatible Serial Interface | High-speed (up to 400 kHz) 2-wire bus for configuring voltages, enabling/disabling rails, and reading status flags. |
| IRQ_N | Open-Drain Interrupt Output | Active-low signal alerts baseband processor of events (thermal alarm, UVLO, comparator trigger) without polling. |
| CMP1, CMP2 | Comparator Inputs | Dedicated analog inputs for detecting external voltage thresholds (e.g., headset plug detection, battery presence). |
| BMON | Battery Monitor Output | Analog voltage proportional to VBATT - enables fuel-gauge functionality or low-battery warning in baseband firmware. |
Key Features
| Feature | Design Value |
|---|---|
| Auto PFM/PWM Mode Switching | Maintains >85% efficiency at loads as low as 100 µA by dynamically selecting optimal regulation mode per buck channel. |
| Programmable LDO Output Voltages | All 9 LDOs support multiple factory-set or runtime-configurable output voltages (e.g., 1.8 V, 2.6 V, 2.85 V) to match SoC I/O and RF requirements. |
| Integrated USB 2.0 Transceiver | Eliminates need for external USB PHY; includes D+/D− ESD protection, suspend detection, and RCV/VP/VM signaling for full protocol compliance. |
| Early Thermal Warning Alarm | Generates IRQ_N pulse before thermal shutdown activates - enables proactive thermal management (e.g., clock throttling, display dimming). |
| Low Sleep Mode Current | Typical quiescent current <10 µA in deep sleep - extends standby time in always-on mobile devices with periodic wake-up events. |
Applications
| CDMA Handset Baseband Power | RF Front-End Biasing |
|---|---|
Use Scenario: Powering multi-core baseband processor, DDR memory, and internal logic in CDMA cellular handsets. IC Role / Device Role / Timing Role: Centralized power domain controller managing voltage sequencing, rail enable timing, and dynamic voltage/frequency scaling (DVFS) coordination. Use Value: Reduces external component count by integrating 2 bucks + 9 LDOs + USB + comparators - cuts BOM cost and PCB area vs. discrete PMIC solutions. |
Use Scenario: Supplying ultra-clean bias to RF synthesizer, TX power amplifier, RX LNA, and TCXO in CDMA transceivers. IC Role / Device Role / Timing Role: Low-noise LDO provider with 35 µV RMS output noise and tight ±2% regulation - ensures phase noise and EVM performance meet 3GPP specifications. Use Value: Eliminates need for external ferrite-bead filtering or separate low-noise regulators, simplifying RF layout and improving yield. |
| Accessory Detection System | USB Host Connectivity |
Use Scenario: Detecting insertion/removal of stereo headsets, chargers, or docking accessories in mobile handsets. IC Role / Device Role / Timing Role: Dual comparator interface with configurable hysteresis and IRQ_N alert - replaces discrete comparator + GPIO solution. Use Value: Enables zero-latency accessory event handling with no CPU polling; supports simultaneous detection of multiple plug types using shared analog inputs. |
Use Scenario: Enabling USB data transfer and charging negotiation between CDMA handset and PC or wall adapter. IC Role / Device Role / Timing Role: Integrated USB 2.0 Full-Speed transceiver with built-in ESD protection, suspend signaling, and VBUS sensing. Use Value: Removes external USB PHY IC and associated passives; reduces layout complexity and improves EMI robustness in compact handset designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP3917RL-M/NOPB | Same die, different device marking (V05 vs V03); identical electrical specs and pinout. | No functional difference; used interchangeably in CDMA handset designs where marking traceability differs. | Select based on TI's production lot allocation or customer-specific marking requirements - fully compatible drop-in replacement. |
| TPS65023RSBR | Three buck regulators (up to 1.2 A), 6 LDOs, no integrated USB transceiver; higher integration for OMAP-based platforms. | Targets OMAP2420/3430-based smartphones; lacks USB PHY and accessory comparators - requires external components for those functions. | Choose when designing for TI OMAP processors with higher current demands and no need for integrated USB or comparator functions. |
Compared with LP3917RL-M/NOPB and TPS65023RSBR, the LP3917RL-N/NOPB offers unique integration of USB 2.0 transceiver and dual comparators within a CDMA-optimized 9-LDO + 2-buck architecture - making it the only option that eliminates both external PHY and accessory-detection circuitry in legacy CDMA handset platforms.
Availability
LP3917RL-N/NOPB is available at Aetrix Electronics and suitable for CDMA handset manufacturing, RF module design, and legacy mobile device repair requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LP3917RL-N/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 headquartered in Dallas, Texas, delivering analog, embedded processing, and wireless technologies across industrial, automotive, and consumer markets.
The LP3917RL-N/NOPB belongs to TI's legacy cellular PMU product line, engineered specifically to consolidate power, interface, and monitoring functions into a single chip for CDMA handset manufacturers - reducing design complexity and accelerating time-to-market for 3G voice-centric devices.
FAQ
What is the primary application target for the LP3917RL-N/NOPB?
The LP3917RL-N/NOPB is purpose-built for CDMA cellular handsets, integrating all essential power rails (2 bucks + 9 LDOs), USB 2.0 connectivity, and accessory detection in one DSBGA package. It directly supports baseband processor domains, RF front-end biasing, and peripheral interfaces - eliminating discrete PMICs and interface ICs in legacy 3G mobile designs. Its feature set aligns precisely with CDMA system requirements defined in early-2000s TI reference designs.
Does the LP3917RL-N/NOPB support dynamic voltage scaling (DVS) for its LDOs?
Yes, the LP3917RL-N/NOPB supports dynamic voltage scaling via its I²C-compatible serial interface (SCL/SDA). All nine LDO outputs can be individually enabled, disabled, or reconfigured to alternate factory-programmed voltage levels (e.g., 1.8 V ↔ 2.6 V) during runtime. This allows baseband firmware to optimize power consumption by matching LDO output to real-time SoC operating states without hardware changes.
What is the function of the IRQ_N pin on the LP3917RL-N/NOPB?
The IRQ_N pin on the LP3917RL-N/NOPB is an open-drain interrupt output that signals asynchronous events to the baseband processor, including thermal alarm, battery undervoltage lockout (UVLO), comparator triggers (CMP1/CMP2), and regulator fault conditions. It eliminates the need for continuous software polling of status registers, reducing CPU overhead and improving system responsiveness to critical power events.
Can the LP3917RL-N/NOPB replace the LP3917RL-M/NOPB in an existing design?
Yes, the LP3917RL-N/NOPB is a direct replacement for the LP3917RL-M/NOPB. Both share identical die design, electrical specifications, pinout, and package (DSBGA-49, YPG). The only difference is the device marking ("V03" vs "V05") used for internal TI traceability. No PCB or firmware changes are required when substituting LP3917RL-N/NOPB for LP3917RL-M/NOPB in production or repair scenarios.
What USB speed and compliance level does the LP3917RL-N/NOPB support?
The LP3917RL-N/NOPB integrates a USB 2.0 Full-Speed transceiver compliant with 12 Mbps data rates and standard USB signaling levels (D+/D− differential pair). It supports suspend/resume detection via SUSPEND pin, VBUS sensing, and built-in ESD protection on D+/D− lines. It does not support High-Speed (480 Mbps) or USB On-The-Go - its USB capability is strictly aligned with host-peripheral communication in CDMA handsets.
LP3917RL-N/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 49-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Cellular, CDMA Handset
- Current - Supply:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 49-DSBGA
LP3917RL-N/NOPB FAQ
1.How can I place an order for LP3917RL-N/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3917RL-N/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 LP3917RL-N/NOPB reliable?
The price and inventory of LP3917RL-N/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3917RL-N/NOPB is usually 5 days.
3.What payment methods are accepted for LP3917RL-N/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3917RL-N/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3917RL-N/NOPB?
LP3917RL-N/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3917RL-N/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 LP3917RL-N/NOPB?
For technical support, including LP3917RL-N/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3917RL-N/NOPB requirements.
6.How does Aetrix verify that LP3917RL-N/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3917RL-N/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 LP3917RL-N/NOPB meets industry standards.
7.What is the process for return or replacement of LP3917RL-N/NOPB?
All LP3917RL-N/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3917RL-N/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 LP3917RL-N/NOPB part is unused and in its original packaging.
Return procedure for LP3917RL-N/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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