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Texas Instruments LM3671TL-ADJ/NOPB
- Part No.:
- LM3671TL-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TL-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,667
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Product details
Overview
LM3671TL-ADJ/NOPB from Texas Instruments is a 2-MHz, 600-mA synchronous step-down DC-DC converter in a 6-pin USON (2.0 mm × 2.0 mm) package, optimized for single Li-Ion battery input (2.7 V to 5.5 V) and adjustable output (1.1 V to 3.3 V). It delivers up to 600 mA load current with 16 µA typical quiescent current in PFM mode, internal soft start, and automatic PWM/PFM mode switching - used in mobile phones, portable medical devices, and handheld transaction terminals.
For engineers reviewing the LM3671TL-ADJ/NOPB datasheet, LM3671TL-ADJ/NOPB pinout, LM3671TL-ADJ/NOPB application, or LM3671TL-ADJ/NOPB equivalent, key selection considerations include its 2-MHz fixed-frequency PWM operation, 0.5-V internal reference voltage, 1020-mA typical peak current limit, thermal shutdown at 150°C, and compatibility with only three external components (2.2-µH inductor + two ceramic capacitors).
Technical Context
The LM3671TL-ADJ/NOPB implements voltage-mode control with input-voltage feed-forward compensation to maintain stable regulation across 2.7–5.5 V input and 1.1–3.3 V adjustable output. Its dual-mode architecture dynamically switches between 2-MHz PWM (for line/load regulation) and hysteretic PFM (for ultra-low 16-µA quiescent current at light loads).
Internal synchronous rectification uses integrated PFET and NFET switches with 380 mΩ/250 mΩ typical RDS(ON), enabling >90% efficiency at 400 mA with 3.6-V input and 1.5-V output. Feedback is referenced to a precision 0.5-V internal bandgap, requiring an external resistor divider on FB for ADJ versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports direct connection to single-cell Li-Ion batteries without pre-regulation. |
| Output Current | Up to 600 mA - sufficient for core logic rails in portable SoCs and microcontrollers. |
| Switching Frequency | 2 MHz (typical) - enables use of compact 2.2-µH inductors and low-ESR ceramic capacitors. |
| Quiescent Current | 16 µA (typical, PFM mode) - extends battery life during standby in always-on portable systems. |
| Feedback Reference | 0.5 V - sets output via external resistor divider (VOUT = 0.5 × (1 + R1/R2)), enabling precise 1.1–3.3 V adjustment. |
| Shutdown Current | 0.01 µA (typical) - minimizes battery drain when system is powered off. |
| Peak Current Limit | 1020 mA (typical) - provides robust overload protection while supporting transient load steps up to 600 mA. |
Pinout & Package
LM3671TL-ADJ/NOPB is housed in a thermally enhanced 6-pin USON package (2.00 mm × 2.00 mm, nominal), with wettable flanks for automated optical inspection. The package features exposed die pad for improved thermal dissipation (RθJA = 174.7°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary supply input (2.7–5.5 V); must be decoupled with ≥4.7-µF ceramic capacitor close to pin. |
| GND | Power Ground | Common return path for input/output power and internal switch node; connects to PCB ground plane. |
| EN | Digital Enable | Active-high logic control: device enabled at >1 V, shutdown at <0.4 V; must not float. |
| FB | Analog Feedback | Connects to resistor divider output; internal 0.5-V reference regulates VOUT = 0.5 × (1 + R1/R2). |
| SW | Switch Node | Connection to internal PFET drain and NFET source; drives external inductor; requires low-inductance layout. |
| SGND | Signal Ground | Separate analog ground for feedback circuitry; tied to GND externally at single point near FB pin. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM/PFM mode switching | Enables high efficiency (>85%) across full 0–600 mA load range without external control logic. |
| Internal synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by 8–12% vs. asynchronous designs. |
| Integrated soft-start | Staged current-limit ramp (70 → 140 → 280 → 1020 mA) prevents inrush current and output overshoot at startup. |
| Thermal shutdown & current limiting | Protects against sustained overloads: shuts down at TJ = 150°C (typ.) and limits peak switch current to 1020 mA (typ.). |
| Ultra-low shutdown current | 0.01 µA (typ.) ensures negligible battery drain in long-term storage or deep-sleep system states. |
Applications
| Mobile Phone Power Management | Portable Medical Sensor Supply |
|---|---|
|
Use Scenario: Powers baseband processor core rail (1.2–1.8 V) from a single Li-Ion cell in slim smartphone designs. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated, low-noise DC supply with fast transient response to CPU load changes. Use Value: 2-MHz switching avoids AM radio band interference; 16-µA PFM quiescent current extends standby time beyond 7 days. |
Use Scenario: Supplies 1.5-V analog front-end (AFE) and 3.3-V MCU in battery-powered glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Adjustable-output DC-DC converter providing stable, low-ripple bias for precision ADCs and sensors. Use Value: 0.5-V internal reference and tight FB voltage tolerance (±2.5%) ensure output accuracy within ±1.5% over temperature and line. |
| Handheld Transaction Terminal | Wireless Home-Automation Hub |
|
Use Scenario: Generates 3.3-V I/O rail and 1.2-V core voltage for secure element and NFC controller in EMV-compliant payment terminals. IC Role / Device Role / Timing Role: Dual-rail power solution using one LM3671TL-ADJ/NOPB per rail, configured via external resistors. Use Value: Only three external components reduce BOM count and PCB area; USON package fits <8-mm-thick industrial enclosures. |
Use Scenario: Powers Zigbee/Thread SoC and RF transceiver in battery-operated smart home gateways with multi-year runtime. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating in PFM mode >95% of duty cycle during sensor polling intervals. Use Value: 0.01-µA shutdown current and automatic light-load PFM mode enable >5-year battery life with CR123A primary cells. |
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 switching frequency; 0.6-V reference; 400-mA output; 5-pin WSON package (1.5 mm × 1.5 mm) | Better suited for space-constrained designs needing higher frequency and smaller inductors; lower max current limits use cases. | Select when footprint reduction and faster transient response outweigh need for 600-mA capability. |
| AP63205WU-7 | 2.5-MHz operation; 600-mA rating; integrated compensation; 6-pin WDFN (2.0 mm × 2.0 mm); no SGND pin | Lacks dedicated signal ground, simplifying layout but reducing noise immunity in high-precision analog systems. | Prefer for cost-sensitive consumer IoT where layout simplicity and integrated loop compensation reduce design risk. |
Compared with TPS62231DRYR and AP63205WU-7, LM3671TL-ADJ/NOPB offers superior thermal performance (lower RθJA than TPS62231DRYR), explicit SGND separation for analog-sensitive applications, and automotive-qualified variants (LM3671-Q1), making it optimal for portable medical and industrial edge devices demanding reliability and precision.
Availability
LM3671TL-ADJ/NOPB is available at Aetrix Electronics and suitable for mobile phone power management, portable medical sensor supply, and handheld transaction terminal applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3671TL-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management ICs for portable and industrial markets.
The LM3671 product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics - emphasizing minimal external component count, low quiescent current, and seamless PWM/PFM transition without external mode control.
FAQ
What is the recommended inductor value for LM3671TL-ADJ/NOPB?
The LM3671TL-ADJ/NOPB datasheet specifies a 2.2-µH shielded surface-mount inductor as optimal for stable 2-MHz operation across 2.7–5.5 V input and 1.1–3.3 V output. TI recommends using a 2.2-µH, 600-mA saturation-current inductor with ≤120 mΩ DCR - such as the Coilcraft XAL5030-222MEB - to maintain regulation under full 600-mA load while minimizing size and EMI. Lower values increase ripple; higher values degrade transient response.
Does LM3671TL-ADJ/NOPB require an external compensation network?
No, LM3671TL-ADJ/NOPB integrates full internal compensation and does not require external compensation components. Its voltage-mode control architecture with feed-forward is factory-tuned for stability with standard 2.2-µH inductors and 4.7–10-µF ceramic output capacitors. Adding external compensation may destabilize the loop or degrade transient performance - TI explicitly prohibits it in the datasheet's Layout section.
How does the FB pin function in LM3671TL-ADJ/NOPB?
In LM3671TL-ADJ/NOPB, the FB pin connects to the center tap of an external resistor divider (R1–R2) that scales the output voltage to match the internal 0.5-V reference. The device regulates VOUT = 0.5 × (1 + R1/R2); TI recommends R2 = 200 kΩ and R1 calculated accordingly. Unlike fixed-output versions, the internal feedback divider is disabled - so FB must never be shorted to GND or left floating.
What thermal derating applies to LM3671TL-ADJ/NOPB at 85°C ambient?
At 85°C ambient temperature on a 4-layer PCB, LM3671TL-ADJ/NOPB's maximum continuous power dissipation is 242 mW (per datasheet Table 6.6), limiting practical output current to ~450 mA at 3.3-V output and 3.6-V input. This derating arises from its USON package RθJA of 174.7°C/W - exceeding this power level risks thermal shutdown activation above 150°C junction temperature.
Can LM3671TL-ADJ/NOPB operate from a 2.5-V input?
No - LM3671TL-ADJ/NOPB has a minimum input voltage of 2.7 V per Absolute Maximum Ratings and Recommended Operating Conditions. Operation below 2.7 V risks undervoltage lockout (UVLO) activation, causing erratic switching or complete disablement. For 2.5-V input systems, consider TI's TPS62840 (1.8–5.5 V input) or Analog Devices' ADP5302 (1.8–5.5 V), both pin-compatible alternatives with lower VIN minima.
LM3671TL-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)
LM3671TL-ADJ/NOPB FAQ
1.How can I place an order for LM3671TL-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TL-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 LM3671TL-ADJ/NOPB reliable?
The price and inventory of LM3671TL-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 LM3671TL-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TL-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TL-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TL-ADJ/NOPB?
LM3671TL-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TL-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 LM3671TL-ADJ/NOPB?
For technical support, including LM3671TL-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TL-ADJ/NOPB requirements.
6.How does Aetrix verify that LM3671TL-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TL-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 LM3671TL-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TL-ADJ/NOPB?
All LM3671TL-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TL-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 LM3671TL-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM3671TL-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671TL-ADJ/NOPB Tags
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