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Texas Instruments LM3671TLX-2.8/NOPB
- Part No.:
- LM3671TLX-2.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TLX-2.8/NOPB.pdf
- Description:
- IC REG BUCK 2.8V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,540
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Product details
Overview
LM3671TLX-2.8/NOPB from Texas Instruments is a fixed-output 2.8 V, 600-mA synchronous step-down DC-DC converter in a 6-pin USON package (2.0 mm × 2.0 mm), operating from 2.7 V to 5.5 V input with 2 MHz fixed-frequency PWM mode and automatic PFM transition for ultra-low quiescent current (16 µA typical). It powers core logic rails in space-constrained portable electronics such as mobile phones and digital still cameras using only one inductor and two ceramic capacitors.
For engineers reviewing the LM3671TLX-2.8/NOPB datasheet, LM3671TLX-2.8/NOPB pinout, LM3671TLX-2.8/NOPB application, or LM3671TLX-2.8/NOPB equivalent, key selection criteria include its 2.8 V fixed output accuracy (±2.5% over temperature), internal synchronous rectification, thermal shutdown at 150°C, 0.01 µA shutdown current, and compatibility with single Li-Ion battery systems requiring high light-load efficiency.
Technical Context
The LM3671TLX-2.8/NOPB uses voltage-mode control with input voltage feed-forward to maintain tight line regulation across 2.7–5.5 V input. Its integrated PFET/NFET power stage enables synchronous rectification, eliminating external diode losses and achieving >90% efficiency at 300 mA with 3.6 V input and 2.8 V output.
It implements intelligent mode switching: fixed 2 MHz PWM above ~80 mA load, hysteretic PFM below that threshold to reduce IQ to 16 µA, and full shutdown at 0.01 µA when EN < 0.4 V. Soft-start limits inrush current via stepped current-limit ramp (70 → 140 → 280 → 1020 mA) during enable transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±2.5% over −40°C to +125°C ambient - ensures stable core supply for low-voltage ASICs and processors. |
| Max Output Current | 600 mA continuous - supports moderate-power RF modules and camera ISPs without external current boosting. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-Ion (fully charged to 4.2 V) and USB-powered 5 V rails. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temp) - enables use of tiny 2.2 µH inductors and reduces EMI filtering burden. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery runtime in standby states of handheld medical devices and wearables. |
| Shutdown Current | 0.01 µA typical - minimizes battery drain during deep sleep in portable transaction terminals. |
| Feedback Reference | 0.5 V internal reference - sets output via internal resistor divider; no external resistors needed for fixed 2.8 V version. |
Pinout & Package
LM3671TLX-2.8/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 and enhanced solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V supply - must be decoupled locally to suppress high-frequency switching noise. |
| SW | Switch Node | Drives external inductor; carries high dv/dt and pulsed current - requires short, low-inductance PCB trace to minimize EMI and ringing. |
| FB | Feedback Input | Internally connected to 2.8 V divider; tied directly to VOUT - no external resistors required; sensitive analog node requiring clean layout. |
| EN | Enable Control | Digital input: active-high (VIH ≥ 1 V), shutdown when < 0.4 V - must not float; pull-down resistor recommended if uncontrolled. |
| GND | Power Ground | Main return path for input/output currents - requires low-impedance connection to thermal pad and input/output capacitors. |
| SGND | Signal Ground | Separate ground for FB reference - connects internally to GND but should be routed separately on PCB to avoid noise coupling into feedback loop. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode, reducing conduction loss and improving efficiency by up to 10% at 2.8 V/300 mA vs. asynchronous designs. |
| Automatic PFM-PWM Mode Switching | Transitions seamlessly at ~80 mA load to maintain >85% efficiency from 1 mA to 600 mA - critical for burst-mode wireless applications. |
| Integrated Soft Start | Staged current-limit ramp prevents inrush into large output capacitors - enables reliable startup with 10 µF ceramic output caps common in portable designs. |
| Thermal Shutdown Protection | Engages at TJ = 150°C (typical) and releases at 130°C - protects against sustained overload or poor heatsinking in sealed enclosures. |
| Low-ESD-Sensitive Design | HBM ±2000 V rating - withstands standard handling per ANSI/ESDA/JEDEC JS-001, reducing field failure risk in high-volume assembly. |
Applications
| Mobile Phone Core Rail | Digital Still Camera ISP Supply |
|---|---|
Use Scenario: Powering baseband processor core voltage in slim smartphone designs where board area is constrained and battery life is critical. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 2.8 V to processor I/O and memory interface circuits. Use Value: 2 MHz switching allows 2.2 µH inductor and 4.7 µF/10 µF ceramic caps - reduces solution footprint by >40% vs. lower-frequency alternatives. |
Use Scenario: Supplying image signal processor (ISP) in compact digital cameras requiring fast transient response during auto-focus and flash operations. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with PFM-to-PWM mode transition under dynamic load steps. Use Value: Load transient recovery within 10 µs (PWM mode) and <50 mV droop at 400 mA step - maintains ISP clock stability during burst capture. |
| Portable Medical Pulse Oximeter | Handheld Transaction Terminal |
Use Scenario: Providing stable 2.8 V rail to analog front-end and microcontroller in battery-operated clinical-grade pulse oximeters. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current DC-DC converter supporting 72-hour continuous operation on single Li-Ion cell. Use Value: 16 µA PFM IQ and 0.01 µA shutdown current extend usable battery life by >3× compared to non-synchronous 1 MHz converters. |
Use Scenario: Powering secure element, display driver, and NFC controller in EMV-compliant payment terminals with intermittent usage patterns. IC Role / Device Role / Timing Role: Always-on auxiliary supply enabling instant wake-from-sleep while maintaining security-critical state retention. Use Value: Fast enable response (<400 µs startup with 10 µF COUT) and precise 2.8 V output ensure deterministic boot timing for secure firmware validation. |
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 | 2.8 V fixed, 600 mA, 3 MHz switching, 17 µA IQ - smaller 1.5 mm × 1.5 mm WSON package but higher RDS(ON) (PFET 550 mΩ). | Better suited for ultra-dense layouts; slightly lower efficiency at 500–600 mA due to higher conduction loss. | Choose TPS62231DRYR when board area is more critical than peak efficiency at high load. |
| AP63202WU-7 | 2.8 V fixed, 600 mA, 2 MHz, 25 µA IQ - WLCSP package (1.23 mm × 0.88 mm), no SGND pin, integrated compensation. | Lacks separate SGND, limiting noise-sensitive analog applications; higher IQ reduces light-load runtime advantage. | Choose AP63202WU-7 only for cost-sensitive consumer products where SGND separation is unnecessary. |
Compared with TPS62231DRYR and AP63202WU-7, LM3671TLX-2.8/NOPB provides superior light-load efficiency via dedicated SGND and lower IQ, making it optimal for battery-powered medical and industrial devices requiring long standby duration and analog signal integrity.
Availability
LM3671TLX-2.8/NOPB is available at Aetrix Electronics and suitable for mobile phone core rails, digital still camera ISP supplies, portable medical pulse oximeters, handheld transaction terminals, and wireless home-automation equipment requiring stable component supply and long-term manufacturability.
Supply support for LM3671TLX-2.8/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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The LM3671 product line was designed specifically for space-constrained, battery-powered portable electronics requiring high efficiency across wide load ranges - emphasizing minimal external component count, low quiescent current, and robust thermal protection.
FAQ
What is the output voltage tolerance of LM3671TLX-2.8/NOPB over temperature and load?
The LM3671TLX-2.8/NOPB delivers a fixed 2.8 V output with ±2.5% tolerance over −40°C to +125°C ambient temperature and full 0–600 mA load range. This specification is verified per TI's electrical characteristics table for the TL grade (USON package), ensuring consistent performance in automotive cabin and industrial edge environments where thermal cycling occurs.
Does LM3671TLX-2.8/NOPB require external feedback resistors?
No, LM3671TLX-2.8/NOPB does not require external feedback resistors. It integrates an internal resistor divider calibrated to 2.8 V output, with the FB pin internally connected to the midpoint. External resistors are only needed for the adjustable (ADJ) versions like LM3671MF-ADJ; the TLX-2.8/NOPB variant uses factory-trimmed internal division.
What is the minimum input voltage required to enable LM3671TLX-2.8/NOPB?
LM3671TLX-2.8/NOPB requires VIN ≥ 2.7 V before enabling stable regulation. TI recommends holding EN low until VIN reaches 2.7 V to prevent erratic startup or undervoltage lockout behavior. The device incorporates undervoltage lockout (UVLO) that disables switching below this threshold, protecting downstream circuitry from brownout conditions.
Can LM3671TLX-2.8/NOPB operate with a 2.2 µH inductor and ceramic capacitors only?
Yes, LM3671TLX-2.8/NOPB is fully specified for operation with a single 2.2 µH shielded inductor and two ceramic capacitors (4.7 µF input, 10 µF output), as shown in the TI datasheet Figure 1. This three-component design meets all electrical and thermal requirements across the full 2.7–5.5 V input and 0–600 mA load range without additional compensation components.
How does LM3671TLX-2.8/NOPB handle thermal overload?
LM3671TLX-2.8/NOPB includes internal thermal shutdown that activates at TJ ≈ 150°C (typical) and resets at ≈130°C. During overload, the device ceases switching, holds SW low, and draws only shutdown current (0.01 µA) until junction temperature falls. This protects both the IC and PCB layout from permanent damage during sustained overcurrent or inadequate heatsinking.
LM3671TLX-2.8/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):
- 2.8V
- 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)
LM3671TLX-2.8/NOPB FAQ
1.How can I place an order for LM3671TLX-2.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TLX-2.8/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-2.8/NOPB reliable?
The price and inventory of LM3671TLX-2.8/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-2.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TLX-2.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TLX-2.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TLX-2.8/NOPB?
LM3671TLX-2.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TLX-2.8/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-2.8/NOPB?
For technical support, including LM3671TLX-2.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TLX-2.8/NOPB requirements.
6.How does Aetrix verify that LM3671TLX-2.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TLX-2.8/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-2.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TLX-2.8/NOPB?
All LM3671TLX-2.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TLX-2.8/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-2.8/NOPB part is unused and in its original packaging.
Return procedure for LM3671TLX-2.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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