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Texas Instruments LM3671TL-3.3/NOPB
- Part No.:
- LM3671TL-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TL-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:449
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Product details
Overview
LM3671TL-3.3/NOPB from Texas Instruments is a fixed-output 3.3 V, 600-mA synchronous step-down DC-DC converter in a 6-pin USON (2.0 mm × 2.0 mm) package. It operates from 2.7 V to 5.5 V input, delivers 2 MHz fixed-frequency PWM switching with automatic PFM mode transition below ~80 mA load, and integrates soft-start, thermal shutdown, and current limiting. It powers core logic rails in portable instrumentation and digital still cameras.
For engineers reviewing the LM3671TL-3.3/NOPB datasheet, LM3671TL-3.3/NOPB pinout, LM3671TL-3.3/NOPB application, or LM3671TL-3.3/NOPB equivalent, key selection criteria include its 3.3 V fixed output, 16 µA quiescent current in PFM mode, 0.01 µA shutdown current, internal synchronous rectification, and requirement for only three external components: one 2.2 µH inductor and two ceramic capacitors.
Technical Context
The LM3671TL-3.3/NOPB uses voltage-mode control with input feed-forward to maintain stable regulation across line and load variations. Its feedback loop references an internal 0.5 V bandgap, with the FB pin internally connected to a precision resistor divider set for 3.3 V output - eliminating external resistors.
It implements intelligent mode switching: fixed 2 MHz PWM above ~80 mA load for low-noise operation, hysteretic PFM below that threshold to reduce quiescent current to 16 µA, and full shutdown at 0.01 µA when EN < 0.4 V. Internal PFET/NFET synchronous rectification replaces external diodes, achieving >90% efficiency at 300 mA with VIN = 3.6 V and VOUT = 3.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2.5% over −40°C to +125°C - enables direct powering of 3.3 V I/O and logic without external feedback resistors. |
| Max Output Current | 600 mA continuous - supports moderate-power microcontrollers, sensors, and interface ICs in space-constrained portable designs. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-Ion (3.0–4.2 V), USB 5 V, and regulated 3.3 V rails. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temperature) - allows use of tiny 2.2 µH inductors and reduces EMI fundamental frequency. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery life in standby and light-load states of handheld devices. |
| Shutdown Current | 0.01 µA typical - minimizes leakage during system sleep, critical for always-on sensor nodes. |
| Internal FET RDS(ON) | PFET: 500 mΩ max; NFET: 400 mΩ max at VIN = 3.6 V - enables high efficiency without external MOSFETs or diodes. |
Pinout & Package
LM3671TL-3.3/NOPB is housed in a 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm (nominal), with wettable flanks for automated optical inspection. The package is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–5.5 V supply; requires local 4.7 µF ceramic decoupling capacitor to minimize input ripple and ESR-related losses. |
| GND (Pin 2) | Power ground | Primary return path for input and output currents; must be connected to low-impedance PCB ground plane. |
| EN (Pin 3) | Digital enable | Active-high logic control: device enabled when voltage ≥1 V; shutdown when ≤0.4 V; must not be left floating. |
| FB (Pin 4) | Feedback input | Internally tied to fixed 3.3 V resistor divider; no external components required - simplifies layout and improves stability. |
| SW (Pin 5) | Switching node | Connects to drain of internal PFET and source of internal NFET; drives external 2.2 µH inductor; high dv/dt node requiring tight layout. |
| SGND (Pin 6) | Signal ground | Separate analog ground reference for FB pin; must be connected to GND at single point near IC to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and board area while improving efficiency by up to 12% at 100 mA. |
| Automatic PFM-PWM mode switching | Seamlessly transitions between 2 MHz PWM (for low-noise, high-accuracy regulation) and variable-frequency PFM (for ultra-low IQ) based on real-time load demand. |
| Internal soft-start | Ramps output voltage over ~275–400 µs (depending on COUT and load) to limit inrush current and prevent input rail droop during power-up. |
| Thermal and current protection | Thermal shutdown engages at TJ ≈ 150°C and releases at ≈130°C; cycle-by-cycle current limiting trips at 1020 mA peak switch current. |
| Minimal external component count | Only three passive components required: 2.2 µH shielded inductor, 4.7 µF input ceramic capacitor, and 10 µF output ceramic capacitor. |
Applications
| Mobile Phone Power Management | Digital Still Camera Core Rail |
|---|---|
|
Use Scenario: Supplying 3.3 V to image sensor interface, flash memory controller, and display driver in compact smartphone modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V from shared Li-Ion battery rail, dynamically adapting between PWM and PFM modes during capture vs. preview states. Use Value: 16 µA quiescent current in PFM extends standby time; 2 MHz switching enables small 2.2 µH inductor placement near sensor module without compromising EMI performance. |
Use Scenario: Powering CMOS image sensor logic, SD card interface, and auto-focus motor driver in DSLR or mirrorless camera bodies. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing clean, low-noise 3.3 V supply with fast transient response to handle burst-mode sensor readout and flash charging. Use Value: Internal soft-start prevents voltage overshoot during wake-from-sleep; thermal shutdown protects against overheating during extended video recording sessions. |
| Portable Medical Instrumentation | Wireless Home-Automation Hub |
|
Use Scenario: Regulating 3.3 V for Bluetooth LE transceiver, biometric sensor ADC, and microcontroller in wearable ECG monitors. IC Role / Device Role / Timing Role: Efficient, low-IQ power stage enabling multi-day battery life while maintaining precise 3.3 V reference for analog signal chain integrity. Use Value: 0.01 µA shutdown current preserves battery during patient idle periods; 2.7–5.5 V input range accommodates both coin-cell and rechargeable battery configurations. |
Use Scenario: Supplying 3.3 V to Zigbee/Thread SoC, environmental sensor array, and LED status indicators in smart home gateway units. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter supporting intermittent high-current RF bursts and long-duration low-power listening modes. Use Value: Synchronous rectification sustains >88% efficiency at 50 mA (typical sensor polling load); USON package enables dense, double-sided PCB layouts. |
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 | 3.3 V fixed, 600 mA, 3 MHz switching, 17 µA IQ, 6-pin WSON (2.0 × 2.0 mm) - identical footprint but higher fSW and slightly higher quiescent current. | Optimized for ultra-thin wearables where 3 MHz enables sub-1 µH inductors; less suitable for noise-sensitive analog sections due to higher fundamental frequency. | Select TPS62231DRYR if board space permits smaller inductors and system-level EMI filtering can accommodate 3 MHz harmonics. |
| AP3012KTR-G1 | 3.3 V fixed, 500 mA, 1.5 MHz switching, 25 µA IQ, SOT-23-5 - lower current rating, larger package, no integrated NFET (requires external diode). | Lower cost solution for non-critical, low-volume industrial controls where efficiency and size are secondary to BOM simplicity. | Choose AP3012KTR-G1 only for cost-driven, low-power applications where 500 mA max load and external diode overhead are acceptable. |
Compared with TPS62231DRYR and AP3012KTR-G1, LM3671TL-3.3/NOPB offers the best balance of 600 mA capability, 2 MHz operation, 16 µA PFM IQ, and fully integrated synchronous rectification in a minimal 2.0 × 2.0 mm USON package - making it optimal for mainstream portable electronics requiring proven reliability and design simplicity.
Availability
LM3671TL-3.3/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3671TL-3.3/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 experience in high-reliability DC-DC conversion solutions.
The LM3671 product line was designed specifically for space-constrained, battery-powered portable electronics - delivering high efficiency, ultra-low quiescent current, and minimal external component count without sacrificing protection or regulation accuracy.
FAQ
What is the recommended input capacitor for LM3671TL-3.3/NOPB?
The LM3671TL-3.3/NOPB datasheet specifies a 4.7 µF ceramic capacitor at the VIN pin. This value ensures sufficient charge reservoir for the 2 MHz switching cycle, limits input voltage ripple to <100 mV, and maintains stability under transient load steps. X5R or X7R dielectrics with ≤100 mΩ ESR are recommended; placement must be within 3 mm of VIN and GND pins.
Does LM3671TL-3.3/NOPB require external feedback resistors?
No. LM3671TL-3.3/NOPB is a fixed-output variant with internal resistor divider network configured for 3.3 V. The FB pin is pre-connected to this network, so no external resistors are needed - reducing BOM count, layout complexity, and potential tolerance-induced output error.
What is the thermal shutdown behavior of LM3671TL-3.3/NOPB?
LM3671TL-3.3/NOPB activates thermal shutdown at approximately 150°C junction temperature and resumes operation once TJ cools to ~130°C. During shutdown, the device halts switching, disables internal FETs, and draws only 0.01 µA - protecting itself and downstream circuitry from permanent damage due to sustained overload or poor heatsinking.
Can LM3671TL-3.3/NOPB operate from a single alkaline cell?
No. LM3671TL-3.3/NOPB requires a minimum input voltage of 2.7 V per its Recommended Operating Conditions. A fresh alkaline cell starts at ~1.6 V and drops rapidly under load, making it incompatible. It is designed for single Li-Ion (3.0–4.2 V), USB 5 V, or regulated 3.3 V sources.
How does the soft-start function work in LM3671TL-3.3/NOPB?
LM3671TL-3.3/NOPB implements soft-start by incrementally increasing the internal switch current limit 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, limiting inrush current to prevent input rail collapse and output overshoot - typical startup time is 275 µs (1 mA load) to 400 µs (300 mA load).
LM3671TL-3.3/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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)
LM3671TL-3.3/NOPB FAQ
1.How can I place an order for LM3671TL-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TL-3.3/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 LM3671TL-3.3/NOPB reliable?
The price and inventory of LM3671TL-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671TL-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TL-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TL-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TL-3.3/NOPB?
LM3671TL-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TL-3.3/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 LM3671TL-3.3/NOPB?
For technical support, including LM3671TL-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TL-3.3/NOPB requirements.
6.How does Aetrix verify that LM3671TL-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TL-3.3/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 LM3671TL-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TL-3.3/NOPB?
All LM3671TL-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TL-3.3/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 LM3671TL-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM3671TL-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671TL-3.3/NOPB Tags
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TPS562201DDCR
Texas Instruments
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MC34063ABD-TR
STMicroelectronics
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TPS561201DDCR
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MC33063ADR
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MC34063ADR
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TPS560200DBVR
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AP3012KTR-G1
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TLV61048DBVR
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AZ34063UMTR-G1
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AP62300TWU-7
Diodes Incorporated
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MC34063EBD-TR
STMicroelectronics
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