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Texas Instruments LM3280TL-290/NOPB
- Part No.:
- LM3280TL-290/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WFBGA
- Datasheet:
-
LM3280TL-290/NOPB.pdf
- Description:
- IC REG QD BUCK/LNR 2MHZ 16TUSMD
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3280TL-290/NOPB from Texas Instruments is an integrated power management IC combining a synchronous step-down DC-DC converter with three independent 2.85V LDOs, designed for RF power amplifier biasing in cellular handsets. It supports 2.7V–5.5V input, delivers up to 300mA in PWM mode and 500mA in bypass mode, and enables dynamic VOUT adjustment (0.8V–3.6V) via analog VCON control - all in a 16-pin DSBGA package.
For engineers reviewing the LM3280TL-290/NOPB datasheet, LM3280TL-290/NOPB pinout, LM3280TL-290/NOPB application, or LM3280TL-290/NOPB equivalent, key selection criteria include its triple-LDO enable independence, VCON-based real-time PA voltage scaling, automatic bypass transition thresholds (VBYPASS±), thermal shutdown behavior, and DSBGA layout constraints for high-density RF modules.
Technical Context
The LM3280TL-290/NOPB implements a current-mode synchronous buck regulator with internal PFET/NFET switches and a dedicated bypass FET, enabling seamless transition between PWM and low-dropout bypass operation based on SVIN–VOUT differential detection. Its VCON pin provides direct 3× gain control of output voltage (VOUT = 3 × VCON), eliminating external feedback resistors while maintaining ±2% output accuracy at 3.6V.
Each of the three LDOs features independent digital enable inputs (ENLDO1/2/3), fast transient response (<100µs turn-on), 20mA max load capability, and 70mV typical dropout at 20mA. All LDOs require ENBUCK to be asserted first and share SGND reference, with dedicated charge/discharge circuits ensuring controlled ramp-up/ramp-down during enable/disable transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single Li-ion cell operation without external pre-regulation. |
| Buck Output Range | 0.8V to 3.6V - programmable via analog VCON input (0.267V–1.200V) with 3× gain, enabling precise PA efficiency tuning. |
| PWM Load Capability | 300mA max - sufficient for mid-power RF PAs in GSM/EDGE/WCDMA bands with stable regulation. |
| Bypass Mode Load | 500mA max - extends usable battery range by reducing conduction loss when VIN ≈ VOUT. |
| LDO Output Voltage | 2.85V ±1% - tightly regulated reference supply for RF PA bias, with line/load regulation <0.04%/mA. |
| Switching Frequency | 2MHz typical - minimizes EMI interference with IF/data paths and allows compact 2.2µH inductor + 4.7µF output cap design. |
| Thermal Shutdown | 150°C activation with 25°C hysteresis - protects die during sustained high-load or poor PCB thermal dissipation. |
Pinout & Package
LM3280TL-290/NOPB uses a 16-bump DSBGA package (YZR0016QQA) with 0.4mm pitch, requiring microvia PCB design and precision assembly. Package dimensions are 2.13mm × 2.13mm × 0.65mm (max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | LDO1 | Main output of first LDO regulator; supplies 2.85V to Band1 PA with independent ENLDO1 control. |
| B1 | LDO2 | Main output of second LDO regulator; supplies 2.85V to Band2 PA with independent ENLDO2 control. |
| C1 | LDO3 | Main output of third LDO regulator; supplies 2.85V to Band3 PA with independent ENLDO3 control. |
| D1 | ENLDO3 | Digital enable input for LDO3; must be high *and* ENBUCK high to activate LDO3 output. |
| A2 | SVIN | Analog/LDO supply rail; powers internal analog circuitry and LDOs; separate from PVIN to reduce noise coupling. |
| B2 | FB | Feedback node for buck regulator; connects to output capacitor to close voltage regulation loop in PWM mode. |
| C2 | ENLDO2 | Digital enable input for LDO2; requires ENBUCK assertion before activation. |
| D2 | VCON | Analog control input; sets buck output as VOUT = 3 × VCON; must not float; drives PA efficiency optimization. |
| A3 | SGND | Analog and LDO ground reference; isolated from PGND to prevent switching noise injection into sensitive analog blocks. |
| B3 | ENBUCK | Master enable for buck converter; must be high after VIN >2.7V; disables all LDOs when low. |
| C3 | ENLDO1 | Digital enable input for LDO1; synchronized with ENBUCK state for safe sequencing. |
| D3 | BYP | Forced bypass mode control; low (<0.4V) enables direct battery-to-PA path, overriding auto-bypass logic. |
| A4 | BYPOUT | Bypass FET drain terminal; connects to output capacitor; carries full PA load current in bypass mode. |
| B4 | PVIN | Power input for buck switch and bypass FET; routed separately from SVIN to minimize IR drop under high pulsed loads. |
| C4 | SW | Switch node connecting internal PFET/NFET; interfaces with external 2.2µH inductor; critical for EMI layout. |
| D4 | PGND | Power ground for buck converter and bypass FET; forms low-inductance return path for high di/dt currents. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent LDO enables | ENLDO1/2/3 allow per-band PA activation sequencing and power gating in multi-RF-path architectures. |
| VCON-controlled buck output | Eliminates external resistor dividers and enables real-time PA voltage scaling for optimal efficiency across transmit power levels. |
| Auto-bypass transition logic | VBYPASS− (160–320mV) and VBYPASS+ (350–540mV) thresholds ensure smooth, glitch-free mode switching without external supervision. |
| Synchronous rectification | Internal NFET reduces conduction loss vs. diode rectification, sustaining >90% efficiency at 200mA load with 3.6V→1.5V conversion. |
| DSBGA thermal performance | θJA = 48°C/W (JEDEC 4-layer board) enables operation up to +125°C junction temperature in thermally constrained handset designs. |
Applications
| Cellular Handset PA Biasing | Multi-Band RF Front-End |
|---|---|
Use Scenario: Powering linear RF power amplifiers in GSM/EDGE/WCDMA handsets powered by a single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: LM3280TL-290/NOPB acts as the primary PA voltage controller - regulating buck output dynamically via VCON to match PA's instantaneous efficiency curve while supplying stable 2.85V LDO bias to each PA stage. Use Value: Extends talk time by 12–18% versus fixed-output regulators through adaptive VOUT scaling, and avoids PA distortion by maintaining tight LDO regulation during fast envelope tracking events. | Use Scenario: Supporting simultaneous operation of multiple RF bands (e.g., Band1/Band2/Band3) with independent PA enable control. IC Role / Device Role / Timing Role: LM3280TL-290/NOPB provides three isolated 2.85V LDO outputs, each with dedicated ENLDOx pins, allowing system MCU to sequence band-specific PA activation with sub-100µs turn-on delay. Use Value: Enables zero-crossing PA switching without supply rail collapse, reducing inter-band crosstalk and meeting 3GPP ACLR requirements for concurrent transmission scenarios. |
| Battery-Efficient Mobile Radio | Low-Power IoT Cellular Module |
Use Scenario: Enabling long battery life in handheld radios operating across varying signal conditions and battery voltages (3.3V–4.1V). IC Role / Device Role / Timing Role: LM3280TL-290/NOPB operates in automatic bypass mode when battery voltage drops near target VOUT, minimizing dropout loss and preserving PA linearity down to 3.0V battery level. Use Value: Delivers consistent RF output power over full battery discharge cycle, avoiding premature "low-battery" transmit power rollback seen with conventional buck-only solutions. | Use Scenario: Powering NB-IoT or LTE-M modules in compact, sealed enclosures where thermal headroom and board area are severely limited. IC Role / Device Role / Timing Role: LM3280TL-290/NOPB integrates buck + triple LDO in 2.13mm² DSBGA, replacing ≥4 discrete regulators while supporting deep-sleep current <0.3µA via ENBUCK-controlled shutdown. Use Value: Reduces BOM count by 60%, eliminates routing congestion around PA section, and meets IEC 62368-1 creepage requirements through optimized bump layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | Single 300mA buck only; no integrated LDOs or VCON interface; requires external bias supplies for PA. | Requires additional LDOs and sequencing logic for multi-PA systems; lacks analog VOUT control. | Select when only buck regulation is needed and LDOs are provided elsewhere; lower cost but higher total solution size. |
| LP5907MFX-2.85/NOPB | Single 250mA LDO only; no buck, no VCON, no bypass mode; fixed 2.85V output. | Cannot replace LM3280TL-290/NOPB's core function - only suitable as supplemental LDO where buck is handled externally. | Use as backup LDO if one LM3280TL-290/NOPB LDO fails; not a functional substitute for the full PMU. |
Compared with TPS62260DRVR and LP5907MFX-2.85/NOPB, LM3280TL-290/NOPB uniquely integrates adaptive buck control, triple LDOs, and bypass FET in one die - eliminating four external components and enabling true per-PA voltage optimization without MCU intervention.
Availability
LM3280TL-290/NOPB is available at Aetrix Electronics and suitable for cellular handset design, multi-band RF front-end development, and battery-powered IoT module production requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for LM3280TL-290/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.
The LM3280TL-290/NOPB belongs to TI's RF Power Management Unit product line, engineered specifically to optimize efficiency and simplify layout in space-constrained, battery-operated cellular transceivers.
FAQ
What is the purpose of the VCON pin on the LM3280TL-290/NOPB?
The VCON pin on the LM3280TL-290/NOPB is an analog input that directly controls the buck converter's output voltage using a fixed 3× gain relationship: VOUT = 3 × VCON. With VCON ranging from 0.267V to 1.200V, it enables precise, resistorless programming of VOUT from 0.8V to 3.6V - essential for dynamically matching RF PA efficiency curves across transmit power levels without firmware overhead.
How does the LM3280TL-290/NOPB handle thermal overload?
The LM3280TL-290/NOPB incorporates an internal thermal shutdown circuit that activates at TJ = 150°C (typ.) and releases at TJ = 125°C (typ.), providing 25°C hysteresis. During shutdown, the buck converter and all LDOs disable simultaneously. Recovery is automatic once junction temperature falls below the release threshold, and no external reset is required - ensuring robust protection in thermally dense handset PCB layouts.
Can the three LDOs on the LM3280TL-290/NOPB operate independently?
Yes - the LM3280TL-290/NOPB provides fully independent enable control for each LDO via ENLDO1, ENLDO2, and ENLDO3. However, all LDOs require ENBUCK to be high first; if ENBUCK is low, all LDOs remain disabled regardless of individual ENLDO states. This ensures safe power-up sequencing and prevents backfeeding from LDO outputs into the inactive buck section.
What is the difference between forced and automatic bypass mode on the LM3280TL-290/NOPB?
Forced bypass mode is activated by driving the BYP pin low (<0.4V), immediately turning on the internal bypass FET and disabling the PWM switchers. Automatic bypass mode engages when SVIN – VOUT falls below VBYPASS− (160–320mV) for longer than TBYP (10–20µs); it exits when the differential exceeds VBYPASS+ (350–540mV). Both modes deliver up to 500mA with minimal dropout, but forced mode offers deterministic timing control.
Is the LM3280TL-290/NOPB compatible with standard PCB assembly processes?
The LM3280TL-290/NOPB uses a 0.4mm-pitch 16-bump DSBGA package (YZR0016QQA) requiring microvia PCB design, solder paste stencil optimization, and reflow profile validation. While compatible with Class 3 IPC-A-610 assembly standards, it demands precision placement equipment and X-ray inspection due to its bottom-terminal construction - not suitable for wave soldering or manual rework without specialized tools.
LM3280TL-290/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (3)
- Number of Outputs:
- 4
- Frequency - Switching:
- 2MHz
- Voltage/Current - Output 1:
- 0.8V ~ 3.6V, 300mA
- Voltage/Current - Output 2:
- 2.85V, 20mA
- Voltage/Current - Output 3:
- 2.9V, 20mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -30°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DSBGA
LM3280TL-290/NOPB FAQ
1.How can I place an order for LM3280TL-290/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3280TL-290/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 LM3280TL-290/NOPB reliable?
The price and inventory of LM3280TL-290/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3280TL-290/NOPB is usually 5 days.
3.What payment methods are accepted for LM3280TL-290/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3280TL-290/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3280TL-290/NOPB?
LM3280TL-290/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3280TL-290/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 LM3280TL-290/NOPB?
For technical support, including LM3280TL-290/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3280TL-290/NOPB requirements.
6.How does Aetrix verify that LM3280TL-290/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3280TL-290/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 LM3280TL-290/NOPB meets industry standards.
7.What is the process for return or replacement of LM3280TL-290/NOPB?
All LM3280TL-290/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3280TL-290/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 LM3280TL-290/NOPB part is unused and in its original packaging.
Return procedure for LM3280TL-290/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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