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Texas Instruments LM3205SDX-2/NOPB
- Part No.:
- LM3205SDX-2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM3205SDX-2/NOPB.pdf
- Description:
- IC REG BUCK ADJ 650MA 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:3,585
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Product details
Overview
LM3205SDX-2/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 LM3205SDX-2/NOPB datasheet, LM3205SDX-2/NOPB pinout, LM3205SDX-2/NOPB application, or LM3205SDX-2/NOPB equivalent, key selection criteria 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/current protection for compact RF PA supply rails.
Technical Context
The LM3205SDX-2/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 by comparing feedback from the FB pin against an error signal derived from VCON-where VOUT is linearly scaled at 2.5× VCON over 0.32V–1.44V-enabling precise, resistorless PA supply adjustment. Shutdown mode reduces quiescent current to 0.01µA via EN pin logic control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single Li-Ion cell operation without external UVLO circuitry. |
| Output Voltage Range | 0.8V to 3.6V - programmable via analog VCON pin (VOUT = 2.5 × VCON), no external feedback resistors required. |
| 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, 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 EN pin is held low. |
Pinout & Package
LM3205SDX-2/NOPB is packaged in an 8-bump, lead-free, thin DSBGA (YZR0008GNA) with 0.5mm pitch, optimized for space-constrained mobile phone PCBs. The package requires precision assembly and opaque-case mounting due to light sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (A1, A3) | Power Input to PFET Switch | Connects to battery rail (2.7V–5.5V); dual pads reduce IR drop and thermal resistance. |
| VDD (B1) | Analog Supply Input | Powers internal bias and control circuitry; must be decoupled near pin with 10µF ceramic capacitor. |
| EN (C1) | Digital Enable Input | Logic-high (>1.2V) enables operation; logic-low (<0.5V) forces 0.01µA shutdown state. |
| VCON (C2) | Analog Control Input | Sets VOUT = 2.5 × VCON (0.32V–1.44V range); high-impedance (100kΩ) input with 20pF capacitance. |
| FB (C3) | Feedback Input | Connects directly to output filter capacitor; senses regulated output for closed-loop control. |
| SGND (B3) | Analog & Control Ground | Reference for VDD, VCON, FB, and EN; must be separated from PGND to minimize noise coupling. |
| PGND (A1, A3) | Power Ground | Return path for PFET/NFET switching currents; tied to PVIN ground plane with multiple vias. |
| SW (A2) | Switch Node | Connects to inductor; carries high dv/dt switching waveform; requires tight layout and minimal trace area. |
Key Features
| Feature | Design Value |
|---|---|
| Resistorless Output Programming | VOUT set dynamically via VCON analog voltage (0.32V–1.44V), eliminating feedback divider and enabling real-time PA efficiency optimization. |
| Integrated Synchronous Rectification | Internal NFET replaces Schottky diode, reducing conduction loss and improving efficiency by >5% at low VOUT (e.g., 0.8V). |
| Fast Transient Response | 20µs output voltage settling time (0.8V ↔ 3.6V) meets stringent RF PA envelope tracking requirements. |
| Robust Protection Suite | Includes cycle-by-cycle current limiting (1200mA max), thermal shutdown (150°C trip), and ESD-rated I/O (2kV HBM). |
| Ultra-Small System Footprint | Only three external components required: 3.3µH inductor + two 0603 ceramic caps (10µF input / 4.7µF output). |
Applications
| Cellular Handset PA Bias | Hand-Held Radio Transmitter |
|---|---|
Use Scenario: Dynamic supply voltage adjustment for GSM/UMTS/LTE power amplifiers during varying RF transmit power levels. IC Role / Device Role / Timing Role: Primary PA bias regulator with analog VCON-controlled output to match instantaneous RF output power demand. Use Value: Extends battery life by reducing PA supply voltage during low-power transmission, enabled by 2.5× linear VCON scaling and 20µs transient response. |
Use Scenario: Compact, efficient DC-DC supply for portable VHF/UHF transceivers operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Step-down converter delivering stable 1.8V–3.3V PA rail with minimal board area and no external feedback network. Use Value: Enables small form factor via DSBGA-8 package and eliminates resistor placement errors, while maintaining 96% efficiency at 400mA. |
| RF PC Card Power Management | Battery-Powered IoT Transceiver |
Use Scenario: Regulated PA supply in mini-PCIe or M.2-format wireless modules where thermal and spatial constraints limit discrete solutions. IC Role / Device Role / Timing Role: High-frequency (2MHz) buck converter minimizing inductor size and EMI impact on adjacent high-speed digital interfaces. Use Value: Reduces solution size by >40% vs. 500kHz alternatives using same inductor value; 2MHz operation avoids interference with PCIe Gen1/Gen2 clock bands. |
Use Scenario: Low-quiescent, dynamically scalable supply for narrowband IoT transceivers (e.g., LoRa, NB-IoT) requiring burst-mode PA operation. IC Role / Device Role / Timing Role: Efficient PA bias IC supporting deep-sleep (0.01µA shutdown) and rapid wake-up with controlled VOUT ramp. Use Value: Achieves sub-10µA system standby current by combining EN-controlled shutdown and VCON-driven output scaling during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed-frequency buck; 0.6V–5.5V output; 600mA; WSON-6 package; no VCON analog control - uses resistor feedback. | Lacks dynamic VCON-based PA voltage scaling; better suited for fixed-rail digital core supplies than RF PA bias. | Select when fixed output and smaller package (WSON-6) outweigh need for analog PA efficiency tuning. |
| TPS6286518RQYR | 4MHz buck with I²C interface; 0.4V–3.3V output; 1.2A; 1.22mm × 0.82mm WCSP; programmable via digital interface, not analog VCON. | Offers higher current and digital configurability but requires MCU firmware integration and adds communication overhead. | Choose for systems with available I²C resources and need for multi-voltage PA profiles stored in nonvolatile registers. |
Compared with TPS62231DRVR and TPS6286518RQYR, LM3205SDX-2/NOPB uniquely provides analog VCON-based output control without external resistors or digital interfaces-making it optimal for low-latency, low-complexity RF PA bias where real-time voltage scaling is critical and MCU resources are constrained.
Availability
LM3205SDX-2/NOPB is available at Aetrix Electronics and suitable for cellular handset design, portable radio development, and RF PC card integration requiring stable component supply, long-term lifecycle support, and consistent DSBGA-8 packaging.
Supply support for LM3205SDX-2/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 power solutions.
The LM3205SDX-2/NOPB belongs to TI's RF power management product line, designed specifically to deliver dynamically adjustable, space-efficient, high-efficiency bias supplies for cellular and portable RF power amplifiers.
FAQ
What is the function of the VCON pin on the LM3205SDX-2/NOPB?
The VCON pin on the LM3205SDX-2/NOPB is an analog input that directly sets the output voltage according to VOUT = 2.5 × VCON. When VCON is applied between 0.32V and 1.44V, the LM3205SDX-2/NOPB delivers a proportional output from 0.8V to 3.6V without external feedback resistors-enabling real-time PA efficiency optimization in mobile handsets.
Does the LM3205SDX-2/NOPB require external feedback resistors to set output voltage?
No, the LM3205SDX-2/NOPB does not require external feedback resistors. Its output voltage is set entirely by the analog voltage applied to the VCON pin, following the linear relationship VOUT = 2.5 × VCON. This eliminates resistor matching errors, saves board space, and allows dynamic reconfiguration-key advantages of the LM3205SDX-2/NOPB in RF PA applications.
What package type is used for the LM3205SDX-2/NOPB, and what are its layout considerations?
The LM3205SDX-2/NOPB uses an 8-bump, lead-free thin DSBGA (YZR0008GNA) package with 0.5mm pitch. Layout requires strict separation of SGND and PGND planes, short low-inductance PVIN/PGND connections, and shielding from ambient red/IR light due to photosensitive silicon. Precision assembly is mandatory for reliable solder joint formation.
How does the LM3205SDX-2/NOPB achieve high efficiency at low output voltages?
The LM3205SDX-2/NOPB achieves high efficiency at low output voltages (e.g., 96% at 0.8VOUT) through integrated synchronous rectification using a low-RDS(ON) N-channel MOSFET (300mΩ typ. in DSBGA), eliminating Schottky diode forward voltage loss. Combined with 2MHz switching and optimized gate drive, this minimizes conduction and switching losses across the 0.8V–3.6V range.
What protection features are built into the LM3205SDX-2/NOPB?
The LM3205SDX-2/NOPB includes cycle-by-cycle current limiting (1200mA max), thermal shutdown (150°C trip, 130°C recovery), and ESD protection (2kV HBM). It also features a dedicated shutdown mode drawing only 0.01µA when EN is low-critical for battery longevity in always-on RF devices using the LM3205SDX-2/NOPB.
LM3205SDX-2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- 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:
- 10-SON (3x3)
LM3205SDX-2/NOPB FAQ
1.How can I place an order for LM3205SDX-2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3205SDX-2/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 LM3205SDX-2/NOPB reliable?
The price and inventory of LM3205SDX-2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3205SDX-2/NOPB is usually 5 days.
3.What payment methods are accepted for LM3205SDX-2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3205SDX-2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3205SDX-2/NOPB?
LM3205SDX-2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3205SDX-2/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 LM3205SDX-2/NOPB?
For technical support, including LM3205SDX-2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3205SDX-2/NOPB requirements.
6.How does Aetrix verify that LM3205SDX-2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3205SDX-2/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 LM3205SDX-2/NOPB meets industry standards.
7.What is the process for return or replacement of LM3205SDX-2/NOPB?
All LM3205SDX-2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3205SDX-2/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 LM3205SDX-2/NOPB part is unused and in its original packaging.
Return procedure for LM3205SDX-2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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