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Texas Instruments LM3205TLX/NOPB
- Part No.:
- LM3205TLX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFBGA
- Datasheet:
-
LM3205TLX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 650MA 8TUSMD
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3205TLX/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 2 MHz fixed-frequency PWM control, and uses analog VCON pin to set VOUT = 2.5 × VCON - enabling dynamic PA efficiency tuning in cellular handsets.
For engineers reviewing the LM3205TLX/NOPB datasheet, LM3205TLX/NOPB pinout, LM3205TLX/NOPB application, or LM3205TLX/NOPB equivalent, key selection considerations include its DSBGA-8 package footprint, 20 µs VOUT transient response (0.8V ↔ 3.6V), internal synchronous rectification, shutdown current of 0.01 µA, and absence of external feedback resistors due to VCON-based regulation.
Technical Context
The LM3205TLX/NOPB implements a current-mode buck architecture with internal P-channel high-side switch and N-channel synchronous rectifier. Its 2 MHz oscillator enables compact 3.3 µH inductor and ceramic capacitor filtering, minimizing EMI in RF-sensitive layouts. The error amplifier compares FB voltage against a VCON-scaled reference, not a fixed bandgap - enabling direct analog control of output without resistor dividers.
It integrates cycle-by-cycle current limiting (1200 mA max), thermal shutdown (150°C trip), and EN-controlled shutdown with <0.5 V logic low threshold. Unlike standard buck regulators, it lacks UVLO circuitry - requiring system-level sequencing to hold EN low until PVIN ≥2.7 V - a design trade-off for minimal die size in space-constrained DSBGA packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single Li-ion cell operation without pre-regulation. |
| Output Voltage Range | 0.8 V to 3.6 V - set dynamically via 0.32 V–1.44 V analog VCON input (VOUT = 2.5 × VCON). |
| Max Output Current | 650 mA - sustained in PWM mode; limited by internal PFET/NFET RDS(ON) and thermal resistance (100 °C/W in DSBGA). |
| Switching Frequency | 2 MHz (typ.) - enables use of sub-4 mm² total passive area (3.3 µH inductor + two 0603 ceramics). |
| Shutdown Current | 0.01 µA (typ.) - achieved by disabling all internal bias, reference, and switching circuits when EN < 0.5 V. |
| Transient Response | 20 µs (0.8 V ↔ 3.6 V) - fast settling critical for PA envelope tracking during burst transmission. |
| Efficiency | 96% (typ.) at 4.2 VIN, 3.4 VOUT, 400 mA - enabled by synchronous rectification and low RDS(ON) (140 mΩ PFET / 300 mΩ NFET in DSBGA). |
Pinout & Package
The LM3205TLX/NOPB is packaged in an 8-bump, 1.27 mm × 1.27 mm, 0.4 mm pitch DSBGA (YZR0008GNA) with bottom-side solder bumps. Thermal performance relies on PCB copper area under the package; no exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (A1, A3) | Power input to internal PFET switch | Must be decoupled with 10 µF ceramic near package; shares net with VDD but routed separately for noise isolation. |
| VDD (B1) | Analog supply input | Bias source for control circuitry; tied to PVIN externally but requires local 1 µF bypass to SGND. |
| EN (C1) | Digital enable input | Active-high logic control; <0.5 V disables device, >1.2 V enables; must be held low during power-up until PVIN ≥2.7 V. |
| VCON (C2) | Analog voltage control input | Sets output via VOUT = 2.5 × VCON; 0.32–1.44 V range ensures monotonic, linear regulation without external components. |
| FB (C3) | Feedback node input | Connected directly to output capacitor; internal error amp compares this to VCON-derived reference - no resistor divider needed. |
| SGND (B3) | Analog and control ground | Reference for VCON, FB, EN; must be star-connected to PGND at single point to avoid noise coupling into control loop. |
| PGND (A1, A3) | Power ground | Return path for PFET/NFET switching currents; requires wide copper pour and low-inductance connection to input/output capacitors. |
| SW (A2) | Switch node | Drives external inductor; high dv/dt node requiring tight layout, minimum trace length, and guard ring to reduce EMI in RF sections. |
Key Features
| Feature | Design Value |
|---|---|
| VCON-based output programming | Eliminates external feedback resistors and associated layout sensitivity - simplifies BOM and improves long-term stability over temperature. |
| 2 MHz fixed-frequency PWM | Enables use of tiny 3.3 µH inductors and 0603 ceramic capacitors, reducing solution size to <12 mm² total passive area. |
| Internal synchronous rectification | Replaces lossy Schottky diode with 300 mΩ NFET in DSBGA package - boosts efficiency by ~8% at 3.4 V/400 mA vs. asynchronous design. |
| Fast 20 µs output transient response | Supports dynamic PA voltage scaling during TDMA/GSM burst modes without output droop or overshoot exceeding 50 mVpk. |
| Thermal and current protection | Auto-recovering shutdown at 150°C junction temp and cycle-by-cycle current limit (1200 mA max) prevent damage during short-circuit or overload events. |
Applications
| Cellular Handset PA Bias | Hand-Held Radio Transmitter |
|---|---|
Use Scenario: Powering Class AB/Class E RF power amplifiers in GSM/UMTS/LTE smartphones during variable-power transmit bursts. IC Role / Device Role / Timing Role: Adjustable buck regulator providing dynamically scaled VPA synchronized to baseband envelope signal via VCON pin. Use Value: Extends battery life by 18–22% versus fixed 3.3 V supply, as PA efficiency peaks only at specific output power levels. |
Use Scenario: Supplying 1–3 W RF PAs in portable land-mobile radios operating from 7.2 V Li-ion packs with intermediate 3.6 V rail. IC Role / Device Role / Timing Role: Compact, low-noise step-down converter delivering stable 2.5 V–3.4 V bias under rapid load transients (<10 µs rise/fall). Use Value: Enables single-cell operation without discrete LDO post-regulation, reducing heat and board area in sealed handheld enclosures. |
| RF PC Card Power | Battery-Powered IoT Transceiver |
Use Scenario: Providing programmable PA voltage in mini-PCIe or M.2 form-factor wireless cards for Wi-Fi 6/Bluetooth 5 modules. IC Role / Device Role / Timing Role: Space-optimized DC-DC converter with DSBGA-8 footprint fitting within 12 mm × 12 mm card edge constraints. Use Value: Achieves 96% efficiency at 400 mA while occupying <1.6 mm² PCB area - critical for thermal management in stacked module designs. |
Use Scenario: Biasing narrowband IoT transceivers (e.g., LoRa, NB-IoT) requiring precise 1.8 V–3.3 V PA supply with ultra-low quiescent current. IC Role / Device Role / Timing Role: Low-IQ (1.4 mA) buck regulator supporting duty-cycled transmit bursts with <100 µs startup time from shutdown. Use Value: Reduces average system current by 3.2 µA per sleep cycle versus always-on LDO solutions, extending 2000 mAh battery life by >14 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | 3 MHz switching frequency; 0.6 V–6 V output; requires external feedback resistors; 2.5 µA IQ in PWM mode. | Designed for general-purpose portable systems, not RF-PA-optimized; lacks VCON analog control interface. | Choose when fixed-output or wider VIN/VOUT range is needed, but accept added resistor network and reduced PA efficiency tuning granularity. |
| MAX8640YETA+ | 2.25 MHz operation; 0.6 V–3.3 V output; integrated soft-start; 1.2 µA shutdown current; uses I2C for output setting. | Digital-programmable via I2C instead of analog VCON; no direct envelope-tracking capability without MCU intervention. | Prefer for systems with available I2C bus and need multi-voltage PA sequencing, but avoid where analog envelope signal is directly available. |
Compared with TPS62260DRVR and MAX8640YETA+, the LM3205TLX/NOPB uniquely provides true analog VCON-based output control with 20 µs transient response - making it irreplaceable in envelope-tracking PA architectures where MCU latency or digital interface overhead degrades RF linearity.
Availability
LM3205TLX/NOPB is available at Aetrix Electronics and suitable for cellular handset design, portable radio development, RF PC card integration, and battery-powered IoT transceiver projects requiring stable component supply with full lifecycle support.
Supply support for LM3205TLX/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 ICs, with decades of expertise in high-efficiency DC-DC conversion and RF system solutions.
The LM3205TLX/NOPB belongs to TI's RF power management product line, engineered specifically for dynamic biasing of cellular and wireless PA stages - prioritizing small size, fast transient response, and analog envelope compatibility over generic buck functionality.
FAQ
What is the recommended inductor for LM3205TLX/NOPB?
The LM3205TLX/NOPB is optimized for a 3.3 µH shielded inductor with ≥1200 mA saturation current and ≤100 mΩ DCR, such as Taiyo-Yuden NR3015T3R3M. Using lower inductance risks instability during load transients, while higher DCR reduces efficiency below 90% at 400 mA. Inductor placement must minimize loop area with PVIN, SW, and PGND to suppress EMI in adjacent RF sections.
Does LM3205TLX/NOPB require external feedback resistors?
No, the LM3205TLX/NOPB eliminates external feedback resistors by using the VCON pin to directly program output voltage via VOUT = 2.5 × VCON. This analog control method avoids resistor tolerance drift, temperature coefficient errors, and PCB leakage paths that degrade precision in traditional resistor-divider-based buck regulators.
How does LM3205TLX/NOPB handle thermal overload?
The LM3205TLX/NOPB activates thermal shutdown at approximately 150°C junction temperature, turning off both PFET and NFET switches. Operation resumes automatically when junction temperature falls below 130°C. This protection is independent of ambient conditions and relies on on-die thermal sensing - no external components required.
What is the minimum VCON voltage to achieve regulated 0.8 V output with LM3205TLX/NOPB?
A VCON voltage of 0.32 V (±5%) is required to achieve nominal 0.8 V output with the LM3205TLX/NOPB, as specified by VOUT = 2.5 × VCON. Below 0.32 V, the internal PFET minimum on-time (50 ns) prevents stable regulation, causing output to drop unpredictably - especially at low VIN or high load.
Can LM3205TLX/NOPB operate without a system controller managing EN?
No - the LM3205TLX/NOPB lacks internal UVLO and must be held in shutdown (EN < 0.5 V) until PVIN reaches ≥2.7 V. A system controller is required to sequence EN activation after valid input voltage is established; failure to do so may cause erratic startup or excessive inrush current into undervolted circuitry.
LM3205TLX/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
LM3205TLX/NOPB FAQ
1.How can I place an order for LM3205TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3205TLX/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 LM3205TLX/NOPB reliable?
The price and inventory of LM3205TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3205TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3205TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3205TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3205TLX/NOPB?
LM3205TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3205TLX/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 LM3205TLX/NOPB?
For technical support, including LM3205TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3205TLX/NOPB requirements.
6.How does Aetrix verify that LM3205TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3205TLX/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 LM3205TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3205TLX/NOPB?
All LM3205TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3205TLX/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 LM3205TLX/NOPB part is unused and in its original packaging.
Return procedure for LM3205TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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