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Texas Instruments LP8765RLX/NOPB
- Part No.:
- LP8765RLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 49-WFBGA
- Datasheet:
-
LP8765RLX/NOPB.pdf
- Description:
- IC PMU CHRGR 1.2A OVP 49SMDXT
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8765RLX/NOPB from Texas Instruments (formerly National Semiconductor) is a highly integrated Power Management Unit (PMU) for GSM/GPRS/EDGE/CDMA/3G handsets. It integrates a 28V OVP linear Li-Ion charger (50–1200 mA), two synchronous buck regulators (600 mA / 500 mA), ten LDOs-including four low-noise A-type LDOs (10 µV typ. noise)-a 12-bit ADC, real-time clock with alarms, 32.768 kHz oscillator, and three current sinks. It delivers precise power sequencing and thermal regulation for RF, core, memory, and USB transceiver rails.
For engineers reviewing the LP8765RLX/NOPB datasheet, LP8765RLX/NOPB pinout, LP8765RLX/NOPB application, or LP8765RLX/NOPB equivalent, key selection criteria include its 49-bump micro SMD package, I²C programmability, dual-buck + multi-LDO topology, 28V input OVP protection, and support for battery-backed RTC and thermal shutdown with early warning at 125°C.
Technical Context
The LP8765RLX/NOPB implements a hierarchical power architecture: buck regulators supply high-current core/IO rails with auto PFM/PWM mode switching, while A-type LDOs deliver ultra-low-noise voltage to RF ICs (2.85 V @ 200 mA, 10 µV noise). Its I²C interface enables dynamic voltage scaling, startup sequencing control (e.g., 2.5 V ref → LDO5 → Buck2 → Buck1), and status monitoring via IRQ_N interrupt.
Thermal management includes dual-threshold shutdown (125°C early warning, 160°C hard shutdown), thermally regulated charging, and junction-to-ambient thermal resistance of 38.6°C/W. The device supports factory test modes (e.g., high-current mode disabling OVP/thermal regulation) and robust system reset handling-both cold (shutdown + restart) and hot (RSTOUT_N assertion only).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage (VIN_CHG) | 4.5 V to 6.8 V - supports USB 5 V and AC adapter inputs with 28 V OVP protection |
| Buck1 Output | 0.8 V to 1.45 V, 600 mA - supplies processor core with 50 mV voltage steps and soft-start |
| Buck2 Output | 0.8 V to 2.1 V, 500 mA - powers IO/memory with auto PFM mode below light load |
| A-type LDO Noise | 10 µV typ. - enables clean biasing for RF front-end circuits without external filtering |
| ADC Resolution | 12-bit - measures battery temperature (NTC via ADC1), system voltages, and analog signals |
| RTC Accuracy | 32.768 kHz crystal-based - provides calendar/timekeeping with two programmable alarms |
| Package | 49-bump micro SMD, 3.7 mm × 3.7 mm, 0.5 mm pitch - enables compact handset PCB layout |
Pinout & Package
LP8765RLX/NOPB uses a 49-bump micro SMD package (3.7 mm × 3.7 mm, 0.5 mm pitch) with bottom-side solder bumps. Thermal performance is optimized via exposed die pad connection to PCB ground plane per JEDEC Std.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G7 | VIN_CHG | Main DC input for charger block - accepts AC adapter or USB power with integrated 28 V OVP protection |
| G6 | BATT | Main Li-Ion battery connection - enables charging, backup, and system power source selection |
| E4 | IRQ_N | Open-drain interrupt output - signals fault conditions (thermal, regulator fail, RTC alarm) to baseband processor |
| D3, C3 | SCL / SDA | I²C serial interface - configures regulators, reads ADC/RTC status, and controls sequencing (100 kHz / 400 kHz) |
| F3, E1 | FB_B1 / FB_B2 | Buck feedback inputs - set output voltage via external resistor dividers (e.g., 1.2 V Buck1 = 100 kΩ/100 kΩ) |
| E6–A6, C1 | LDO1–LDO9 | Regulated outputs - include A-type (RF), D-type (USIM/SDIO), LILO (core2), and 3.3 V VTRM for USB transceiver |
| A3 | VCOIN | Backup battery input - maintains RTC and 32 kHz oscillator during main battery removal |
| C5 | OSC_32KHz | 32.768 kHz buffered output - drives baseband RTC circuitry with low-jitter timing reference |
Key Features
| Feature | Design Value |
|---|---|
| Linear Li-Ion Charger | Programmable 50–1200 mA charge current with CC/CV profile, 4.05–4.75 V termination, and thermal regulation |
| Ultra-Low-Noise LDOs | Four A-type LDOs deliver 2.85 V @ 200 mA with 10 µV RMS noise - ideal for RF power amplifier biasing |
| Intelligent Power Sequencing | Pre-programmed startup order (2.5 V ref → LDO5 → Buck2 → Buck1) and configurable GPIO-controlled enable logic |
| System Monitoring | 12-bit ADC monitors battery temperature (ADC1), input voltages, and analog signals; dual comparators detect accessories |
| Thermal Protection | Two-tier shutdown: 125°C early-warning interrupt (TSDL) and 160°C automatic power-off (TSDH) |
Applications
| GSM/EDGE Handset Power | 3G Baseband Subsystem |
|---|---|
Use Scenario: Power delivery in dual-mode GSM/EDGE mobile phones with discrete RF transceivers and application processors. IC Role / Device Role / Timing Role: Central PMU managing battery charging, core voltage (Buck1), memory/IO rail (Buck2), and ultra-clean RF bias (A-type LDOs). Use Value: Eliminates need for discrete chargers, buck converters, and low-noise LDOs - reduces BOM count by ≥12 components while meeting 10 µV RF noise spec. | Use Scenario: Power and timing management for 3G baseband processors requiring multiple voltage domains and RTC functionality. IC Role / Device Role / Timing Role: Supplies 1.2 V core, 1.8 V USIM, 3.3 V USB transceiver (VTRM), and 32.768 kHz clock buffer (OSC_32KHz) with battery-backed RTC. Use Value: Enables seamless timekeeping across power cycles via VCOIN backup and guarantees accurate alarm triggering for scheduled wake-up events. |
| Mobile Camera Module | USB OTG Power Control |
Use Scenario: Powering image sensor, ISP, and flash LED in smartphone rear/front camera modules. IC Role / Device Role / Timing Role: Delivers 3 V to SDIO interface (LDO8), 2.85 V to RF/analog blocks (LDO2/LDO3), and PWM-dimmed current sink (SINK1–SINK3) for LED flash control. Use Value: Integrates 4-bit current resolution + 6-bit PWM dimming (up to 120 mA) - replaces external LED driver IC and enables precise flash intensity calibration. | Use Scenario: Enabling USB On-The-Go host functionality in handheld devices with shared USB connector. IC Role / Device Role / Timing Role: Provides dedicated 3.3 V rail (VTRM) for USB transceiver with automatic enable when VIN_CHG is present; monitors VBUS via ADC1 for OTG detection. Use Value: Ensures compliant USB signaling levels and fast VBUS presence detection - eliminates need for external level translators or comparator circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65910A3RSLR | 10-channel PMU with 3 buck, 7 LDO, integrated RTC; no 28 V OVP; uses 0.4 mm pitch 64-ball BGA | Lacks 28 V OVP protection and 10 µV LDO noise spec; targets broader OMAP/AM335x platforms | Choose for higher integration density and ARM Cortex-A8/A9 SoC compatibility; avoid if 28 V input surge protection is mandatory |
| MAX8649ETE+ | Dual-buck + 4 LDO PMU; 1.2 A charger; no RTC, no ADC, no current sinks; 24-pin TQFN | No battery-backed timekeeping or analog monitoring; simpler feature set for cost-sensitive entry-tier handsets | Choose for basic charging + dual-rail power where RTC, ADC, and LED control are handled externally |
Compared with TPS65910A3RSLR and MAX8649ETE+, the LP8765RLX/NOPB uniquely combines 28 V OVP, 10 µV RF LDO noise, integrated RTC with alarms, and three PWM-controllable current sinks - making it optimal for mid-tier 3G handsets requiring robust protection and mixed-signal subsystem integration.
Availability
LP8765RLX/NOPB is available at Aetrix Electronics and suitable for GSM/EDGE/3G handset design, mobile camera module development, and USB OTG power subsystem implementation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP8765RLX/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 acquired National Semiconductor in 2011 and maintains full technical support, documentation, and product lifecycle management for legacy PMU portfolios including the LP8765 series.
The LP8765 product line was designed specifically for single-cell Li-Ion powered cellular handsets requiring high integration, thermal resilience, and RF-clean power delivery across GSM, CDMA, and early 3G standards.
FAQ
What is the maximum input voltage tolerance for LP8765RLX/NOPB's VIN_CHG pin?
The LP8765RLX/NOPB features an integrated 28 V Over-Voltage Protection (OVP) circuit on the VIN_CHG pin, allowing safe operation with transient input surges up to +28 V. This eliminates external protection components when used with unregulated wall adapters or noisy USB sources. The normal operating range remains 4.5 V to 6.8 V per specification.
Does LP8765RLX/NOPB support battery-backed real-time clock functionality?
Yes, LP8765RLX/NOPB supports battery-backed RTC via the VCOIN pin, which accepts a secondary coin-cell or capacitor to maintain timekeeping during main battery removal. The integrated 32.768 kHz oscillator and calendar engine retain date/time and trigger two programmable alarms - critical for wakeup scheduling in standby mode.
How does LP8765RLX/NOPB manage thermal safety during charging and regulation?
LP8765RLX/NOPB implements dual-threshold thermal protection: an early-warning interrupt (TSDL) triggers at 125°C to alert the host processor, while hard shutdown (TSDH) activates at 160°C to execute a controlled power-off sequence. Additionally, the Li-Ion charger dynamically throttles current based on die temperature to prevent thermal runaway during high-ambient operation.
Can LP8765RLX/NOPB's current sinks drive LED flash in mobile cameras?
Yes, LP8765RLX/NOPB integrates three controllable current sinks (SINK1–SINK3) with 4-bit current resolution and 6-bit PWM dimming, supporting up to 120 mA total load. This enables direct LED flash control without external drivers - simplifying camera module design and enabling precise intensity calibration via I²C registers.
What communication interface does LP8765RLX/NOPB use for configuration and monitoring?
LP8765RLX/NOPB uses an I²C-compatible serial bus interface (SCL/SDA pins) operating at standard (100 kHz) and fast (400 kHz) modes. It supports full read/write access to all configuration registers, status flags (e.g., thermal, charger EOC), ADC results, and RTC data - enabling complete system-level power management from the baseband processor.
LP8765RLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 49-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Handheld/Mobile Devices
- Current - Supply:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 49-TuSMD (3.67x3.67)
LP8765RLX/NOPB FAQ
1.How can I place an order for LP8765RLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8765RLX/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 LP8765RLX/NOPB reliable?
The price and inventory of LP8765RLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8765RLX/NOPB is usually 5 days.
3.What payment methods are accepted for LP8765RLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8765RLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8765RLX/NOPB?
LP8765RLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8765RLX/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 LP8765RLX/NOPB?
For technical support, including LP8765RLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8765RLX/NOPB requirements.
6.How does Aetrix verify that LP8765RLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8765RLX/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 LP8765RLX/NOPB meets industry standards.
7.What is the process for return or replacement of LP8765RLX/NOPB?
All LP8765RLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8765RLX/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 LP8765RLX/NOPB part is unused and in its original packaging.
Return procedure for LP8765RLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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