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Texas Instruments LM3671TL-1.2/NOPB
- Part No.:
- LM3671TL-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TL-1.2/NOPB.pdf
- Description:
- IC REG BUCK 1.2V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:472
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Product details
Overview
LM3671TL-1.2/NOPB from Texas Instruments is a fixed-output 1.2 V, 2-MHz synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered portable electronics. It delivers up to 600 mA load current with 16 µA typical quiescent current in PFM mode, internal soft start, and integrated PFET/NFET power switches - used in mobile phone core logic rails and low-voltage microcontroller supply domains.
For engineers reviewing the LM3671TL-1.2/NOPB datasheet, LM3671TL-1.2/NOPB pinout, LM3671TL-1.2/NOPB application, or LM3671TL-1.2/NOPB equivalent, key selection criteria include its 1.2 V fixed output accuracy (±2.5% over temperature), 2.7–5.5 V input range, 2 MHz switching frequency enabling <2.2 µH inductor use, and USON-6 package compatibility with space-constrained handheld PCB layouts.
Technical Context
The LM3671TL-1.2/NOPB employs voltage-mode PWM control with input feed-forward compensation and automatic transition to hysteretic PFM mode below ~80 mA load. Its internal 0.5 V reference feeds a precision error amplifier that regulates output via FB pin feedback - but for fixed 1.2 V versions, the internal resistor divider replaces external resistors.
Operation relies on synchronous rectification using an integrated NFET (RDSON = 250–400 mΩ) paired with a PFET (RDSON = 380–500 mΩ), eliminating external diode losses. Thermal shutdown engages at TJ ≈ 150°C (typical), and undervoltage lockout prevents startup below VIN = 2.7 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±2.5% over –40°C to +125°C ambient - ensures stable core voltage for ARM Cortex-M series MCUs without external feedback components. |
| Input Voltage Range | 2.7 V to 5.5 V - supports direct connection to single-cell Li-ion (3.0–4.2 V), USB 5 V, or regulated 3.3 V rails without pre-regulation. |
| Max Output Current | 600 mA continuous - sufficient for powering dual-core application processors or multi-rail PMIC subsystems in compact form factors. |
| Switching Frequency | 2 MHz (typical), 1.6–2.6 MHz over temperature - enables use of 2.2 µH shielded inductors ≤2.0 mm × 2.0 mm, minimizing board area and EMI filter size. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery runtime in standby states (e.g., Bluetooth LE beacon sleep cycles) without compromising wake-up response. |
| Shutdown Current | 0.01 µA typical - reduces system-level leakage during full power-off, critical for always-on sensor nodes with >1-year battery life targets. |
| Internal Reference | 0.5 V precision bandgap - provides stable regulation baseline for fixed-output variants; eliminates external resistor tolerance errors affecting VOUT accuracy. |
Pinout & Package
LM3671TL-1.2/NOPB uses the USON-6 (NKH) package: 2.00 mm × 2.00 mm body, 0.5 mm pitch, wettable flank terminals for automated optical inspection. Thermal pad on bottom enhances heat dissipation in high-current operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–5.5 V; requires local 4.7 µF ceramic capacitor to suppress high-frequency switching noise and stabilize input impedance. |
| GND (Pin 2) | Power ground | Primary return path for PFET/NFET switching currents; must be connected directly to thermal pad and low-impedance PCB ground plane. |
| EN (Pin 3) | Digital enable | Active-high logic input; device enables when voltage ≥1 V, shuts down when ≤0.4 V; internal pull-down avoids floating-state risk. |
| FB (Pin 4) | Feedback input | Internally connected to fixed 1.2 V divider; not user-accessible - simplifies layout by removing external resistor network and trace sensitivity. |
| SW (Pin 5) | Switching node | Drives external 2.2 µH inductor; carries high di/dt square wave (0–VIN); requires short, wide copper pour and tight loop with GND and COUT. |
| SGND (Pin 6) | Signal ground | Separate analog ground for FB reference; must tie to main GND at single point near IC to avoid noise coupling into regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction loss by >30% at 1.2 V/500 mA and improving full-load efficiency to >90%. |
| Automatic PFM-PWM mode switching | Maintains >85% efficiency from 1 mA to 600 mA load without manual mode control or external circuitry - ideal for burst-mode wireless transceivers. |
| Internal soft-start | Ramps output voltage over ~275–400 µs (load-dependent) to limit inrush current into 10 µF output capacitors, preventing input rail collapse during power-up. |
| Thermal and current protection | Combines cycle-by-cycle peak current limiting (1020 mA typ.) and thermal shutdown (150°C trip) to survive sustained overload or poor heatsinking in sealed enclosures. |
| Ultra-small USON-6 footprint | 2.0 mm × 2.0 mm body with 0.5 mm pitch enables placement under narrow bezels or behind camera modules in smartphones and wearables. |
Applications
| Mobile Phone Core Rail | Wearable MCU Power |
|---|---|
|
Use Scenario: Supplying 1.2 V core voltage to application processors (e.g., Qualcomm Snapdragon 210) during active video decode and idle BLE advertising cycles. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1.2 V with fast transient response (<10 µs recovery from 100 mA → 500 mA step) to maintain SoC stability. Use Value: 2 MHz switching enables sub-100 ns pulse-width control, minimizing output voltage droop during CPU burst loads while sustaining >88% efficiency across 1–600 mA. |
Use Scenario: Powering ARM Cortex-M4F microcontrollers in fitness trackers requiring 1.2 V core and 1.8 V I/O rails with multi-week battery life. IC Role / Device Role / Timing Role: Standby-optimized DC-DC converter operating in PFM mode at 1–10 mA loads, then seamlessly transitioning to PWM at wake-up events. Use Value: 16 µA quiescent current extends coin-cell battery life beyond 12 months in low-duty-cycle sensing applications without sacrificing dynamic performance. |
| Digital Still Camera Sensor Bias | Automotive Infotainment Display Logic |
|
Use Scenario: Providing clean 1.2 V bias to CMOS image sensor digital cores during high-speed burst capture (10 fps) with minimal switching noise coupling into analog pixel readout. IC Role / Device Role / Timing Role: Low-noise power source with tightly controlled FB reference (0.5 V ±1%) and internal soft-start to prevent sensor initialization glitches. Use Value: Fixed 1.2 V output eliminates external resistor drift errors; USON-6 package allows placement adjacent to sensor die with minimized trace inductance. |
Use Scenario: Generating 1.2 V for display controller ASICs in automotive head units operating across –40°C to +105°C ambient with AEC-Q100 compliance requirements. IC Role / Device Role / Timing Role: Automotive-grade power stage supporting cold-crank (4.5 V min) and load-dump (5.5 V max) conditions while maintaining output regulation. Use Value: Qualified per AEC-Q100 Grade 1 (–40°C to +125°C junction), with 2.7–5.5 V input range and thermal shutdown ensuring reliability in under-dash environments. |
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 | 1.2 V fixed, 3 MHz switching, 400 mA max, 12 µA IQ, WSON-6 (2.0 × 2.0 mm) | Lower max current and higher frequency - better suited for ultra-low-power IoT sensors than high-throughput mobile SoCs. | Select when prioritizing lowest possible quiescent current (12 µA) and faster transient response over 600 mA capability. |
| AP63202WS6-7 | 1.2 V fixed, 2 MHz, 2 A max, 25 µA IQ, SOT-563 (2.1 × 1.6 mm) | Higher current rating and larger SOT-563 footprint - trades board area for robustness in industrial HMIs with variable loads. | Select when system load may exceed 600 mA or when thermal margin is constrained and larger package improves heat spreading. |
Compared with TPS62231DRYR and AP63202WS6-7, LM3671TL-1.2/NOPB uniquely balances 600 mA delivery, 16 µA PFM IQ, and USON-6 size - making it optimal for space-limited consumer devices needing mid-range current with automotive-grade reliability.
Availability
LM3671TL-1.2/NOPB is available at Aetrix Electronics and suitable for mobile phones, wearable electronics, and automotive infotainment displays requiring stable component supply across extended production lifecycles.
Supply support for LM3671TL-1.2/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM3671 product line delivers highly integrated, small-footprint DC-DC converters targeting battery-powered portable devices - emphasizing low IQ, automatic mode switching, and simplified design for rapid time-to-market in consumer and automotive segments.
FAQ
What is the output voltage tolerance of LM3671TL-1.2/NOPB over temperature?
The LM3671TL-1.2/NOPB guarantees a fixed 1.2 V output with ±2.5% tolerance over the full –40°C to +125°C junction temperature range. This specification is validated per Electrical Characteristics Table 6.7 in the SNVS294S datasheet, where FB voltage accuracy for TL-grade parts is tested across temperature and load conditions.
Does LM3671TL-1.2/NOPB require external feedback resistors?
No, LM3671TL-1.2/NOPB does not require external feedback resistors. As a fixed-output variant, it integrates an internal resistor divider tied to the 0.5 V internal reference - the FB pin is internally connected and not user-accessible, simplifying layout and eliminating resistor tolerance-induced VOUT drift.
What package type is used by LM3671TL-1.2/NOPB?
LM3671TL-1.2/NOPB uses the USON-6 (NKH) package: 2.00 mm × 2.00 mm body size, 0.5 mm lead pitch, and exposed thermal pad on the bottom. This package is distinct from the SOT-23 and DSBGA variants offered in the LM3671 family and is specified in the Device Information table of the datasheet.
How does LM3671TL-1.2/NOPB handle light-load efficiency?
LM3671TL-1.2/NOPB automatically transitions from PWM to PFM mode below ~80 mA load, reducing quiescent current to 16 µA typical. In PFM, it modulates switching frequency rather than duty cycle, maintaining >85% efficiency down to 1 mA - verified in Figure 13 and Figure 14 of the SNVS294S datasheet.
Is LM3671TL-1.2/NOPB qualified for automotive applications?
No, LM3671TL-1.2/NOPB is not AEC-Q100 qualified. Only the LM3671-Q1 variant carries automotive qualification (Grade 1: –40°C to +125°C ambient). The LM3671TL-1.2/NOPB is intended for commercial and industrial portable electronics, as confirmed in the Product Folder and Feature section of the datasheet.
LM3671TL-1.2/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):
- 1.2V
- 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-1.2/NOPB FAQ
1.How can I place an order for LM3671TL-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TL-1.2/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 LM3671TL-1.2/NOPB reliable?
The price and inventory of LM3671TL-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671TL-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TL-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TL-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TL-1.2/NOPB?
LM3671TL-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TL-1.2/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 LM3671TL-1.2/NOPB?
For technical support, including LM3671TL-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TL-1.2/NOPB requirements.
6.How does Aetrix verify that LM3671TL-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TL-1.2/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 LM3671TL-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TL-1.2/NOPB?
All LM3671TL-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TL-1.2/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 LM3671TL-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM3671TL-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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