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Texas Instruments LM3205TL/NOPB
- Part No.:
- LM3205TL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFBGA
- Datasheet:
-
LM3205TL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 650MA 8TUSMD
- Quantity:
- Payment:
- Shipping:
Inventory:3,674
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Product details
Overview
LM3205TL/NOPB from Texas Instruments is a miniature, adjustable, synchronous step-down DC-DC converter optimized for RF power amplifier (PA) biasing in battery-powered mobile devices. It operates from 2.7V to 5.5V input, delivers 0.8V–3.6V output at up to 650mA, features 2MHz PWM switching, and uses analog VCON control (VOUT = 2.5 × VCON) for dynamic PA efficiency tuning in cellular handsets.
For engineers reviewing the LM3205TL/NOPB datasheet, LM3205TL/NOPB pinout, LM3205TL/NOPB application, or LM3205TL/NOPB equivalent, key selection considerations include its DSBGA-8 package footprint, VCON-based voltage programming without external resistors, fast 20µs output transient response, integrated PFET/NFET synchronous rectification, and thermal/overcurrent protection for compact RF front-end designs.
Technical Context
The LM3205TL/NOPB implements a current-mode buck regulator with internal 2MHz oscillator, slope-compensated PWM control, and cycle-by-cycle peak current limiting (1200mA max). Its architecture integrates a P-channel high-side switch and N-channel synchronous rectifier, eliminating external diode requirements.
Voltage regulation is achieved via feedback error amplification of the FB pin signal, while output setpoint is determined solely by the analog VCON input (0.32V–1.44V range), enabling real-time PA supply modulation. Shutdown mode reduces quiescent current to 0.01µA with EN pin assertion.
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. |
| Output Voltage Range | 0.8V to 3.6V - programmable via analog VCON pin (VOUT = 2.5 × VCON), no external resistors needed. |
| Max Output Current | 650mA - sustained load capability in PWM mode with thermal derating per θJA = 100°C/W (DSBGA). |
| Switching Frequency | 2MHz (typ.) - enables use of ultra-small 3.3µH inductors and 0603 ceramic capacitors. |
| Efficiency | 96% (typ.) at 4.2VIN/3.4VOUT/400mA - achieved via internal synchronous rectification and low RDS(ON) (140mΩ P-FET / 300mΩ N-FET in DSBGA). |
| Transient Response | 20µs (0.8V ↔ 3.6V) - ensures stable PA supply during rapid transmit power level changes. |
| Shutdown Current | 0.01µA (typ.) - minimizes battery drain when RF PA is inactive. |
Pinout & Package
LM3205TL/NOPB is packaged in an 8-bump, 0.5mm pitch, lead-free DSBGA (YZR0008GNA) with bottom-side thermal pad. The package is designed for space-constrained mobile phone PCBs and requires precision assembly due to fine-pitch bump layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (A1, A3) | Power Input Supply | Connects to Li-ion battery rail (2.7V–5.5V); feeds internal P-FET switch; requires local 10µF ceramic decoupling. |
| VDD (B1) | Analog Supply Rail | Bias supply for control circuitry; must be tied to PVIN for proper operation; not internally regulated. |
| EN (C1) | Digital Enable Input | Active-high logic control (VIH = 1.2V min); asserts shutdown state (<0.5V) to reduce IQ to 0.01µA. |
| VCON (C2) | Analog Voltage Control | Directly sets VOUT = 2.5 × VCON (0.32V–1.44V range); 100kΩ input impedance; 20pF capacitance. |
| FB (C3) | Feedback Input | Monitors output voltage at COUT; internal reference derived from VCON; no external resistor divider required. |
| SGND (B3) | Analog Ground Reference | Reference node for VDD, VCON, FB, and EN; must be separated from PGND to minimize noise coupling. |
| PGND (A1, A3) | Power Ground Return | High-current return path for PFET/NFET switches and inductor; connects to SW node ground plane. |
| SW (A2) | Switch Node | Drives external inductor; carries high dv/dt switching waveform; requires tight layout and Kelvin connection. |
Key Features
| Feature | Design Value |
|---|---|
| VCON-controlled output | Eliminates external feedback resistors and enables real-time PA voltage scaling for battery life optimization. |
| 2MHz fixed-frequency PWM | Reduces external component size: only 3.3µH inductor + two 0603 ceramics required for full implementation. |
| Integrated synchronous rectification | Replaces external Schottky diode; achieves 96% efficiency at 400mA by minimizing conduction loss. |
| Cycle-by-cycle current limit | 1200mA peak limit prevents damage during short-circuit or overload; includes timed-limit mode below 0.375VOUT. |
| Thermal shutdown | Disables both FETs at ~150°C junction temperature; resumes operation after cooling to ~125°C. |
Applications
| Cellular Handset PA Bias | Hand-Held Radio Transmitter |
|---|---|
Use Scenario: Dynamic power control in GSM/UMTS/LTE handset RF front-end during varying signal conditions. IC Role / Device Role / Timing Role: Adjustable buck converter supplying precise, low-noise bias voltage to GaAs/GaN PA stages. Use Value: Extends battery runtime by reducing PA supply voltage during low-power transmission modes without sacrificing linearity. |
Use Scenario: Portable two-way radio requiring efficient, compact DC-DC conversion for UHF/VHF PA stages. IC Role / Device Role / Timing Role: Primary PA supply regulator with fast transient response to support burst-mode digital protocols. Use Value: Enables small form factor design with minimal BOM count-only inductor and two ceramics needed beyond IC. |
| RF PC Card Power | Battery-Powered IoT Transceiver |
Use Scenario: Miniaturized wireless data card (e.g., 3G/4G WWAN) operating from single-cell Li-ion. IC Role / Device Role / Timing Role: Efficient step-down regulator delivering programmable PA voltage under host CPU control via DAC-driven VCON. Use Value: Supports adaptive power management firmware that scales PA voltage based on link quality metrics. |
Use Scenario: Low-duty-cycle LPWAN node (e.g., LoRa, NB-IoT) transmitting intermittently from coin-cell or small Li-ion. IC Role / Device Role / Timing Role: High-efficiency PA supply with ultra-low shutdown current (0.01µA) preserving battery charge between transmissions. Use Value: Achieves >10-year shelf life in always-on sensor nodes by minimizing quiescent drain during sleep intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz switching, 600mA max, fixed 1.8V/2.5V/3.3V outputs or resistor-programmable; no VCON analog control. | Lacks dynamic analog voltage scaling; suited for fixed-voltage or digitally adjusted systems using I²C. | Select when digital interface or higher frequency is prioritized over analog PA-level control. |
| TPS62260DRVR | 2.25MHz, 600mA, VSET pin accepts 0.6V–1.24V analog input (VOUT = 2×VSET); different gain and range vs. LM3205TL/NOPB. | Compatible control scheme but narrower VSET range and lower max output (2.48V); less suitable for 3.4V PA rails. | Consider only for sub-2.5V PA applications where TPS62260's tighter VOUT tolerance is beneficial. |
Compared with TPS62231DRVR and TPS62260DRVR, LM3205TL/NOPB uniquely provides 0.8V–3.6V analog-programmable output with 2.5× gain and 2MHz operation in a 1.5mm × 1.5mm DSBGA, making it the only option validated for direct integration into RF PA bias chains requiring wide-range, low-latency voltage modulation.
Availability
LM3205TL/NOPB is available at Aetrix Electronics and suitable for cellular handsets, handheld radios, RF PC cards, and battery-powered IoT transceivers requiring stable component supply with long lifecycle support.
Supply support for LM3205TL/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 connectivity technologies, with decades of expertise in power management ICs for mobile and RF applications.
The LM3205TL/NOPB belongs to TI's RF power management product line, engineered specifically to deliver dynamically controllable, high-efficiency bias supplies for cellular and wireless transmitter stages in space-constrained portable devices.
FAQ
What is the function of the VCON pin on the LM3205TL/NOPB?
The VCON pin on the LM3205TL/NOPB is an analog input that directly controls the output voltage according to VOUT = 2.5 × VCON. With VCON ranging from 0.32V to 1.44V, the LM3205TL/NOPB delivers 0.8V to 3.6V output without external feedback resistors. This enables real-time PA efficiency tuning in cellular handsets and eliminates need for DAC-to-resistor interfaces.
Does the LM3205TL/NOPB require external compensation components?
No, the LM3205TL/NOPB uses internal compensation and requires no external RC networks. Its current-mode architecture with built-in slope compensation ensures stability across the full 0.8V–3.6V output range and 2.7V–5.5V input range when used with the recommended 3.3µH inductor and 4.7µF/10µF ceramic capacitors. Layout adherence to TI's DSBGA guidelines is critical for robust performance.
What package type is used for the LM3205TL/NOPB?
The LM3205TL/NOPB is supplied in an 8-bump, 0.5mm pitch, lead-free DSBGA package (YZR0008GNA), measuring 1.5mm × 1.5mm. This chip-scale package features bottom-side thermal pads and is optimized for ultra-compact mobile phone PCBs. It differs from the WSON-10 variant (LM3205SD) and requires precision placement equipment and controlled reflow profiles.
How does the LM3205TL/NOPB handle overcurrent conditions?
The LM3205TL/NOPB employs dual overcurrent protection: cycle-by-cycle peak current limiting (1200mA max) during normal PWM operation, and timed current limit mode activated when output drops below ~0.375V. In timed mode, the PFET is disabled for 3.5µs per cycle to force inductor current decay, preventing thermal runaway while maintaining control loop integrity under severe overload.
Can the LM3205TL/NOPB operate from a 2.5V input supply?
No, the LM3205TL/NOPB has a minimum operating input voltage of 2.7V as specified in its Absolute Maximum Ratings and Operating Ratings. Operation below 2.7V may result in improper startup, regulation failure, or undefined behavior. System design must ensure EN remains low until PVIN exceeds 2.7V, as the device lacks internal UVLO circuitry.
LM3205TL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 3.6V
- Current - Output:
- 650mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TuSMD
LM3205TL/NOPB FAQ
1.How can I place an order for LM3205TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3205TL/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 LM3205TL/NOPB reliable?
The price and inventory of LM3205TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3205TL/NOPB is usually 5 days.
3.What payment methods are accepted for LM3205TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3205TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3205TL/NOPB?
LM3205TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3205TL/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 LM3205TL/NOPB?
For technical support, including LM3205TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3205TL/NOPB requirements.
6.How does Aetrix verify that LM3205TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3205TL/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 LM3205TL/NOPB meets industry standards.
7.What is the process for return or replacement of LM3205TL/NOPB?
All LM3205TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3205TL/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 LM3205TL/NOPB part is unused and in its original packaging.
Return procedure for LM3205TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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