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Texas Instruments LM3218SEE/NOPB
- Part No.:
- LM3218SEE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SMD Module
- Datasheet:
-
LM3218SEE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 650MA 8POS
- Quantity:
- Payment:
- Shipping:
Inventory:4,704
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Product details
Overview
LM3218SEE/NOPB from Texas Instruments is a miniature, adjustable step-down DC-DC converter with integrated 2.6 µH inductor, optimized for RF power amplifier (PA) biasing in single-cell Li-Ion systems. It delivers up to 650 mA output current, supports 0.8V–3.6V dynamically programmable VOUT via analog VCON input (VOUT = 2.5 × VCON), and operates at 2 MHz PWM switching frequency for minimal RF interference in cellular handsets.
For engineers reviewing the LM3218SEE/NOPB datasheet, LM3218SEE/NOPB pinout, LM3218SEE/NOPB application, or LM3218SEE/NOPB equivalent, key selection considerations include its integrated-inductor POS package, VCON-controlled output voltage scaling, fast 25 µs transient response (0.8V → 3.4V), shutdown current of 0.01 µA, and RDSON(P) management for efficiency optimization across load range.
Technical Context
The LM3218SEE/NOPB implements a current-mode synchronous buck architecture with internal P-channel main switch and N-channel synchronous rectifier. Its control loop uses slope-compensated PWM with cycle-by-cycle current limiting (800 mA / 1100 mA depending on VCON threshold) and thermal shutdown at 150°C.
It features dual PFET RDSON(P) management-switching between small-PFET (960 mΩ) below 0.40V VCON and large-PFET (140 mΩ) above 0.42V VCON-to optimize conduction loss vs. drive loss. Output voltage is set exclusively by VCON analog input (no external resistors), enabling real-time PA supply modulation without firmware or digital interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 650 mA max at VOUT ≥ 1.05V; 400 mA max at VOUT ≤ 1.00V - defines usable PA bias range under PWM mode |
| Input Voltage Range | 2.7V to 5.5V - compatible with single Li-Ion cell including full discharge to 2.7V |
| VOUT Programming | VOUT = 2.5 × VCON, VCON = 0.32V–1.44V - enables precise, resistorless PA voltage scaling for battery life extension |
| Switching Frequency | 2.0 MHz (typ.) - allows use of tiny 0603 ceramic capacitors and minimizes EMI in RF-sensitive layouts |
| Shutdown Current | 0.01 µA (typ.) - critical for ultra-low-power standby in mobile phone TX_OFF states |
| Transient Response | 25 µs rise time (0.8V → 3.4V) - meets fast PA power-level switching requirements in WCDMA/LTE burst modes |
| Efficiency | 95% at VIN = 3.9V, VOUT = 3.4V, IOUT = 400 mA - enables high-efficiency PA operation near battery end-of-life |
Pinout & Package
LM3218SEE/NOPB is housed in an 8-pin POS (Package-on-Substrate) package measuring 3.0 mm × 2.5 mm × 1.2 mm, integrating a 2.6 µH inductor within the substrate. This chip-scale module eliminates discrete inductor placement and reduces board area by up to 25% versus traditional buck solutions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Digital enable input | Logic-high (>1.2V) enables regulation; logic-low (<0.5V) disables output and reduces quiescent current to 0.01 µA |
| VCON | Analog voltage control input | Sets VOUT = 2.5 × VCON; 0.32V–1.44V range yields 0.8V–3.6V output; hysteresis ensures stable on/off transition |
| FB | Feedback input | Internally connected to VOUT; no external resistor divider required - simplifies layout and eliminates feedback error sources |
| SGND | Analog/control ground reference | Separate from PGND to minimize noise coupling into error amplifier and VCON path |
| VOUT | Regulated output node | Connects directly to one terminal of integrated inductor; requires only COUT (4.7 µF) for filtering |
| PGND | Power ground return | Low-impedance return path for inductor current and synchronous rectifier; must be routed separately from SGND |
| PVIN | Power input to PFET switch | Accepts 2.7V–5.5V input; tied internally to VDD in typical applications but electrically isolated for layout flexibility |
| VDD | Analog supply input | Bias supply for control circuitry; typically connected to PVIN but may be decoupled independently for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.6 µH inductor | Enables complete 3 mm × 2.5 mm solution footprint - eliminates inductor selection, placement, and EMI shielding effort |
| VCON-controlled output | Eliminates external feedback resistors and DACs; enables dynamic PA voltage scaling via baseband processor GPIO or DAC |
| RDSON(P) management | Automatically selects small-PFET (960 mΩ) or large-PFET (140 mΩ) based on VCON to maximize efficiency at light and heavy loads |
| 2 MHz fixed-frequency PWM | Reduces size of external CIN/COUT to 0603 ceramics; avoids sub-harmonic oscillation and simplifies EMI filter design |
| Timed current limit protection | Activates 3.5 µs blanking after overcurrent trip to prevent latch-up during hard short or low-VOUT overload conditions |
Applications
| Cellular Handset PA Biasing | Hand-Held Radio Transmitter |
|---|---|
|
Use Scenario: Dynamic supply voltage adjustment for GSM/WCDMA/LTE power amplifiers during varying RF transmit power levels. IC Role / Device Role / Timing Role: Step-down DC-DC converter providing regulated, VCON-programmable VOUT to RF PA collector/drain rail. Use Value: Extends battery runtime by reducing PA supply voltage during low-power transmission, enabled by 25 µs VOUT transient response. |
Use Scenario: Compact, high-efficiency bias supply for portable UHF/VHF transceivers operating from single Li-Ion cells. IC Role / Device Role / Timing Role: Integrated buck regulator delivering stable 1.8V–3.3V to final-stage PA under variable load and temperature. Use Value: Achieves 95% efficiency at 400 mA while occupying <7.5 mm² PCB area - critical for handheld form factor constraints. |
| RF PC Card Power Management | Battery-Powered IoT Transceiver |
|
Use Scenario: Space-constrained power solution for mini-PCIe or M.2 RF modules requiring programmable PA voltage and low quiescent current. IC Role / Device Role / Timing Role: Primary PA supply IC with EN-controlled shutdown and VCON-based output scaling synchronized to host controller commands. Use Value: Reduces total solution size by 25% vs discrete inductor designs and supports <1 µA system sleep current via EN pin control. |
Use Scenario: Low-power wide-area network (LPWAN) transceiver bias in battery-operated sensors with multi-year lifetime targets. IC Role / Device Role / Timing Role: Efficient, digitally controllable PA supply enabling adaptive transmit power control per link budget requirements. Use Value: Delivers 650 mA peak current with 0.01 µA shutdown current - preserves battery capacity during extended receive/idle intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF PA DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | External inductor required; 2.25 MHz switching; no VCON analog control - uses FB resistor divider for fixed VOUT | Lacks dynamic voltage scaling; suited for fixed-output PA rails where PA gain is controlled digitally | Select TPS62260DRVR when board space permits external inductor and VOUT is static or digitally reconfigured |
| TPS62740DSSR | Ultra-low IQ (360 nA); 0.7V–5.5V input; 1.8V–3.3V fixed outputs; no VCON or programmable VOUT | Optimized for ultra-low-power always-on receivers, not high-current PA biasing | Select TPS62740DSSR only for receive-path LDO replacement or low-IQ biasing - not for 650 mA PA loads |
Compared with TPS62260DRVR and TPS62740DSSR, LM3218SEE/NOPB uniquely combines integrated inductance, analog VCON control, and 650 mA capability - making it the only option for compact, dynamically scalable PA bias in space- and battery-limited mobile RF systems.
Availability
LM3218SEE/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 guaranteed traceable sourcing.
Supply support for LM3218SEE/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 expertise in high-efficiency DC-DC conversion and RF system solutions.
The LM3218SEE/NOPB belongs to TI's RF power management product line, engineered specifically for dynamic biasing of cellular and wireless PA stages in battery-powered handheld devices - prioritizing integration, efficiency, and transient performance.
FAQ
What is the function of the VCON pin on the LM3218SEE/NOPB?
The VCON pin on the LM3218SEE/NOPB is an analog input that directly sets the output voltage according to VOUT = 2.5 × VCON. With VCON ranging from 0.32V to 1.44V, it produces a regulated 0.8V to 3.6V output without external resistors. This enables real-time PA supply modulation for battery life optimization in cellular handsets and other RF transmitters.
Does the LM3218SEE/NOPB require external inductors or feedback resistors?
No, the LM3218SEE/NOPB integrates a 2.6 µH inductor within its POS package and uses VCON for output voltage setting - eliminating both external inductors and feedback resistors. Only two external ceramic capacitors (CIN and COUT) are required, reducing bill-of-materials and PCB area by up to 25% compared to discrete buck solutions.
What is the maximum output current capability of the LM3218SEE/NOPB?
The LM3218SEE/NOPB delivers up to 650 mA when VOUT ≥ 1.05V (e.g., 3.4V output), and 400 mA when VOUT ≤ 1.00V (e.g., 0.8V output), under PWM mode. Current capability depends on VCON level due to RDSON(P) management: higher VCON activates the large PFET (140 mΩ), supporting greater load current with lower conduction loss.
How does the LM3218SEE/NOPB achieve fast transient response for RF PA applications?
The LM3218SEE/NOPB achieves 25 µs typical rise time (0.8V → 3.4V) through its current-mode PWM architecture with slope compensation, fast comparator response, and optimized gate drive. This enables rapid PA supply voltage changes during LTE/WCDMA burst transmission, maintaining signal integrity and minimizing droop-induced distortion in the RF output stage.
What protection features are built into the LM3218SEE/NOPB?
The LM3218SEE/NOPB includes cycle-by-cycle current limiting (800 mA / 1100 mA), timed current limit mode for severe overloads, thermal shutdown at ~150°C, and hysteresis on VCON and EN pins for robust start-up and disable behavior. These protections ensure reliable operation during RF PA load transients, short circuits, and thermal stress without external components.
LM3218SEE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SMD Module
- 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-POS (3.0x2.5)
LM3218SEE/NOPB FAQ
1.How can I place an order for LM3218SEE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3218SEE/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 LM3218SEE/NOPB reliable?
The price and inventory of LM3218SEE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3218SEE/NOPB is usually 5 days.
3.What payment methods are accepted for LM3218SEE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3218SEE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3218SEE/NOPB?
LM3218SEE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3218SEE/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 LM3218SEE/NOPB?
For technical support, including LM3218SEE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3218SEE/NOPB requirements.
6.How does Aetrix verify that LM3218SEE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3218SEE/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 LM3218SEE/NOPB meets industry standards.
7.What is the process for return or replacement of LM3218SEE/NOPB?
All LM3218SEE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3218SEE/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 LM3218SEE/NOPB part is unused and in its original packaging.
Return procedure for LM3218SEE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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