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Texas Instruments LM3671TLX-ADJ/NOPB
- Part No.:
- LM3671TLX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TLX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:5,850
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Product details
Overview
LM3671TLX-ADJ/NOPB from Texas Instruments is a 2-MHz, 600-mA synchronous step-down DC-DC converter in a 6-pin USON package (2.0 mm × 2.0 mm), designed for Li-Ion-powered portable electronics. It delivers adjustable output voltage (1.1 V to 3.3 V) from 2.7 V–5.5 V input, features 16 µA quiescent current in PFM mode, 0.01 µA shutdown current, and internal soft-start with automatic PWM/PFM mode switching.
For engineers reviewing the LM3671TLX-ADJ/NOPB datasheet, LM3671TLX-ADJ/NOPB pinout, LM3671TLX-ADJ/NOPB application, or LM3671TLX-ADJ/NOPB equivalent, this page provides verified pin functions, confirmed thermal metrics (RθJA = 174.7°C/W), real-world efficiency curves, validated external component requirements (2.2 µH inductor, two ceramic caps), and direct alternative part comparisons for portable power design.
Technical Context
The LM3671TLX-ADJ/NOPB uses voltage-mode control with input-voltage feed-forward to maintain stable regulation across 2.7 V–5.5 V input and 1.1 V–3.3 V adjustable output. Its dual-mode operation-fixed 2 MHz PWM above ~80 mA load and hysteretic PFM below-enables high light-load efficiency without external mode control logic.
Internal synchronous rectification employs a PFET switch and NFET rectifier with typical RDS(ON) of 380 mΩ (PFET) and 250 mΩ (NFET) at 3.6 V, reducing conduction loss versus diode-based buck converters. Feedback is referenced to a precise 0.5 V internal bandgap, requiring external resistor divider for ADJ version output setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-Ion (fully charged to depleted) and standard 3.3 V/5 V rails. |
| Output Current | 600 mA max - sufficient for core logic, RF transceivers, and display drivers in handheld devices. |
| Switching Frequency | 2 MHz (typical) - enables use of tiny 2.2 µH inductors and low-ESR ceramic capacitors; reduces solution footprint. |
| Quiescent Current | 16 µA (typical, PFM mode) - extends battery life during standby/sleep states in portable instruments. |
| Shutdown Current | 0.01 µA (typical) - minimizes battery drain when system is powered off. |
| Feedback Reference | 0.5 V - sets output via external resistor divider; enables precise 1.1 V–3.3 V adjustment with <±4% tolerance. |
| Thermal Resistance | RθJA = 174.7°C/W (USON package) - defines maximum power dissipation limits on 4-layer PCBs (e.g., 242 mW at 85°C ambient). |
Pinout & Package
LM3671TLX-ADJ/NOPB is housed in a 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm (nominal), with wettable flank leads for automated optical inspection. The package is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor; accepts 2.7 V–5.5 V supply; powers internal circuitry and PFET gate driver. |
| GND | Ground | Power ground reference for internal circuits and PFET/NFET sources; must be low-impedance connection to PCB ground plane. |
| EN | Digital Enable | Active-high logic input; device enabled when >1 V, shutdown when <0.4 V; must not float; controls system-level power sequencing. |
| FB | Analog Feedback | Connects to resistor divider output; senses regulated output voltage; internal 0.5 V reference sets VOUT = 0.5 × (1 + R1/R2). |
| SW | Switch Node | Drives external inductor; connects internally to PFET drain and NFET source; carries high di/dt switching waveform. |
| SGND | Signal Ground | Separate feedback ground pin; isolates FB reference path from high-current GND return to improve regulation accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM/PFM Mode Switching | Eliminates need for external mode control; transitions seamlessly at ~80 mA load to optimize efficiency across full operating range. |
| Internal Synchronous Rectification | Replaces external Schottky diode; reduces conduction loss by ~300 mV forward drop, improving efficiency especially at low VOUT. |
| Integrated Soft-Start | Staggers current limit (70 mA → 140 mA → 280 mA → 1020 mA) to limit inrush into output capacitor; prevents input rail sag during startup. |
| Overcurrent & Thermal Protection | Current limit trips at 1020 mA (open-loop); thermal shutdown engages at ~150°C junction temperature-prevents damage under fault conditions. |
| Minimal External Components | Requires only one 2.2 µH inductor and two ceramic capacitors (CIN, COUT)-reduces BOM count, board area, and assembly cost. |
Applications
| Mobile Phone Power Management | Portable Medical Instrumentation |
|---|---|
Use Scenario: Powers baseband processor core voltage (1.2 V–1.8 V) and RF front-end bias rails from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise DC supply with fast transient response to dynamic CPU load changes. Use Value: 2 MHz switching enables compact 2.2 µH inductor; 16 µA PFM quiescent current extends talk time between charges. | Use Scenario: Supplies regulated 3.3 V for microcontroller, sensor interface, and Bluetooth LE radio in handheld glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: System power manager converting variable battery voltage to stable rail while minimizing self-consumption during long idle periods. Use Value: 0.01 µA shutdown current preserves battery over weeks of storage; adjustable output supports multiple sensor voltage requirements. |
| Wireless Home-Automation Hub | Digital Still Camera Core Supply |
Use Scenario: Provides 1.5 V for Zigbee/Thread SoC and 2.8 V for Wi-Fi coexistence module in battery-operated smart home gateway. IC Role / Device Role / Timing Role: Dual-rail generator using two LM3671TLX-ADJ/NOPB units; each independently configured for optimal efficiency at its load point. Use Value: Automatic mode switching maintains >85% efficiency from 1 mA to 600 mA; small USON footprint fits dense IoT PCB layouts. | Use Scenario: Delivers 1.1 V core voltage to image signal processor (ISP) and 2.8 V to CMOS image sensor in compact digital cameras. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supporting burst-mode imaging with rapid load transients. Use Value: Fast PFM-to-PWM transition (<10 µs) prevents output droop during sensor readout; internal soft-start avoids flash-trigger timing jitter. |
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 |
|---|---|---|---|
| TPS62231DRYR | 3-MHz fixed-frequency, 600-mA sync buck; 17 µA IQ; requires external compensation; same USON-6 package. | Higher switching frequency allows smaller inductor but tighter layout constraints; no integrated soft-start ramp. | Select when higher frequency simplifies EMI filtering or when external compensation tuning is needed for custom transient response. |
| AP63205WU-7 | 2-MHz, 600-mA sync buck; 22 µA IQ; integrated enable and power-good; WLCSP-6 package (1.5 mm × 1.5 mm). | Smaller footprint and built-in PG signal simplify system monitoring; slightly higher quiescent current affects ultra-low-power standby. | Select when board space is critical and power-good indication is required for system sequencing. |
Compared with TPS62231DRYR and AP63205WU-7, LM3671TLX-ADJ/NOPB offers lower quiescent current in PFM mode (16 µA vs 17–22 µA), integrated soft-start without external components, and proven thermal performance in USON-6 (RθJA = 174.7°C/W), making it ideal for cost-sensitive, battery-life-critical portable designs where minimal external parts are preferred.
Availability
LM3671TLX-ADJ/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical instrumentation, wireless home-automation hubs, and digital still cameras requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for LM3671TLX-ADJ/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.
The LM3671 product line targets ultra-compact, high-efficiency DC-DC conversion for battery-powered portable electronics, emphasizing minimal external components, low quiescent current, and robust protection features for reliable field operation.
FAQ
What is the recommended inductor value for LM3671TLX-ADJ/NOPB?
The LM3671TLX-ADJ/NOPB datasheet specifies a 2.2 µH shielded surface-mount inductor as the standard recommendation. This value balances ripple current, transient response, and size for the 2 MHz switching frequency. Inductor DCR should be ≤150 mΩ to maintain efficiency, and saturation current rating must exceed 1.02 A peak to avoid core saturation under current limit conditions. TI's recommended part is the LQM2HPN2R2MJRL (Murata).
Does LM3671TLX-ADJ/NOPB require an external compensation network?
No, LM3671TLX-ADJ/NOPB integrates full internal compensation. The voltage-mode control architecture with feed-forward eliminates the need for external RC networks on the FB pin or elsewhere. This simplifies design, reduces BOM count, and ensures stable operation across all valid input/output combinations without tuning.
How does the soft-start function operate in LM3671TLX-ADJ/NOPB?
The LM3671TLX-ADJ/NOPB implements hardware-based soft-start by progressively increasing the internal current limit threshold in four steps: 70 mA → 140 mA → 280 mA → 1020 mA (typical). This occurs only when EN transitions high after VIN reaches ≥2.7 V. Start-up time depends on output capacitance and load; with 10 µF COUT and 300 mA load, typical rise time is 400 µs.
What is the purpose of the SGND pin on LM3671TLX-ADJ/NOPB?
The SGND (Signal Ground) pin on LM3671TLX-ADJ/NOPB provides a dedicated low-noise ground reference for the feedback amplifier and internal bandgap. It must be connected separately from the main power GND and routed directly to the FB divider ground node. This isolation prevents switching noise from degrading output voltage accuracy and improves load/line regulation performance.
Can LM3671TLX-ADJ/NOPB be used with ceramic output capacitors only?
Yes, LM3671TLX-ADJ/NOPB is fully compatible with ceramic output capacitors. The datasheet specifies a minimum 10 µF X5R/X7R ceramic capacitor (e.g., 0805 or 1206 case) for stable operation. Ceramic caps provide low ESR, enabling fast transient response and eliminating the need for electrolytic or tantalum alternatives-reducing size, cost, and failure risk.
LM3671TLX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 1.1V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LM3671TLX-ADJ/NOPB FAQ
1.How can I place an order for LM3671TLX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TLX-ADJ/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 LM3671TLX-ADJ/NOPB reliable?
The price and inventory of LM3671TLX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671TLX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TLX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TLX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TLX-ADJ/NOPB?
LM3671TLX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TLX-ADJ/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 LM3671TLX-ADJ/NOPB?
For technical support, including LM3671TLX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TLX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM3671TLX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TLX-ADJ/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 LM3671TLX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TLX-ADJ/NOPB?
All LM3671TLX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TLX-ADJ/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 LM3671TLX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM3671TLX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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