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Texas Instruments LM3671LC-1.3/NOPB
- Part No.:
- LM3671LC-1.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-UFDFN
- Datasheet:
-
LM3671LC-1.3/NOPB.pdf
- Description:
- IC REG BUCK 1.3V 600MA 6USON
- Quantity:
- Payment:
- Shipping:
Inventory:2,988
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Product details
Overview
LM3671LC-1.3/NOPB from Texas Instruments is a fixed-output 1.3 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 automatic PWM/PFM mode switching - used in mobile phones and digital still cameras for core voltage regulation.
For engineers reviewing the LM3671LC-1.3/NOPB datasheet, LM3671LC-1.3/NOPB pinout, LM3671LC-1.3/NOPB application, or LM3671LC-1.3/NOPB equivalent, key selection criteria include input voltage range (2.7 V–5.5 V), fixed 1.3 V output accuracy (±4%), thermal shutdown at 150°C, and USON-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3671LC-1.3/NOPB implements voltage-mode control with input feed-forward compensation and internal 0.5 V reference. Its 2-MHz fixed-frequency PWM operation ensures stable regulation under moderate-to-heavy loads, while hysteretic PFM mode activates below ~80 mA to reduce quiescent current to 16 µA.
Internal synchronous rectification uses integrated PFET and NFET switches with RDS(ON) of 380 mΩ (PFET) and 250 mΩ (NFET) at 3.6 V, enabling high efficiency without external diodes. Soft-start limits inrush current via stepped current-limit thresholds (70/140/280/1020 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.3 V ±4% - tightly regulated core supply for low-voltage logic and RF ICs. |
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-Ion (fully charged to depleted) and USB-powered systems. |
| Max Load Current | 600 mA - sufficient for application processors, baseband ICs, and camera modules. |
| Switching Frequency | 2 MHz (typical) - enables use of small 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors. |
| Quiescent Current | 16 µA (typical, PFM mode) - extends battery life during standby and light-load operation. |
| Shutdown Current | 0.01 µA (typical) - minimizes leakage when system is powered off. |
| Feedback Reference | 0.5 V internal bandgap - sets output via internal resistor divider; no external resistors required for fixed versions. |
Pinout & Package
LM3671LC-1.3/NOPB is housed in a 2.00 mm × 2.00 mm USON-6 (NKH) package with wettable flanks, optimized for automated optical inspection and high-density portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to input filter capacitor; accepts 2.7–5.5 V supply - must be ≥2.7 V before enabling. |
| GND | Ground reference | Primary power ground; ties to PCB ground plane for noise control and thermal dissipation. |
| EN | Digital enable | Active-high logic input; device enabled when >1 V, shutdown when <0.4 V - must not float. |
| FB | Feedback node | Internally connected to fixed 1.3 V divider; shorted to VOUT - no external resistors needed. |
| SW | Switching node | Drives external inductor; carries high di/dt - requires tight layout and low-inductance routing. |
| SGND | Signal ground | Separate feedback ground pin; improves regulation accuracy by isolating analog reference path. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM/PFM mode switching | Transitions at ~80 mA load to maintain >85% efficiency across 10 µA–600 mA output range. |
| Internal synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves full-load efficiency by ~8% vs. asynchronous designs. |
| Integrated soft-start | Staged current-limit ramp (70→140→280→1020 mA) prevents input rail collapse during power-up. |
| Thermal and overload protection | Shuts down at 150°C junction temperature and limits peak switch current to 1020 mA (typical). |
| Ultra-low shutdown current | 0.01 µA typical - critical for always-on subsystems and long-term storage battery drain budgets. |
Applications
| Mobile Phone Core Power | Digital Still Camera Sensor Bias |
|---|---|
Use Scenario: Powers baseband processor core rails in slim smartphones operating from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.3 V at up to 600 mA with dynamic load response. Use Value: Enables 2-MHz switching to shrink passive size while maintaining >90% efficiency at 300 mA, reducing board area by 35% vs. 500-kHz alternatives. |
Use Scenario: Supplies image sensor analog front-end requiring low-noise, tightly regulated 1.3 V bias. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with low ripple (<10 mVpp) in PWM mode and fast transient recovery. Use Value: Internal soft-start prevents sensor reset glitches; PFM mode extends standby time between shots without compromising startup stability. |
| Portable Medical Pulse Oximeter | W-LAN Baseband Module |
Use Scenario: Powers microcontroller and analog signal chain in battery-operated clinical-grade oximeters. IC Role / Device Role / Timing Role: Primary power stage with shutdown control synchronized to measurement cycles. Use Value: 0.01 µA shutdown current preserves battery for >6 months in intermittent-use devices; thermal shutdown ensures safe operation during extended diagnostics. |
Use Scenario: Supplies 1.3 V core voltage to IEEE 802.11b/g/n baseband ICs in compact wireless modules. IC Role / Device Role / Timing Role: High-frequency buck converter supporting burst-mode transmission with minimal voltage droop. Use Value: 2-MHz operation avoids interference with 2.4 GHz ISM band; automatic PFM entry during idle periods cuts average system current by 40%. |
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 | Fixed 1.3 V output, 3-MHz switching, 400-mA max load, 17-µA quiescent current, SOT-23-5 package. | Limited to lower current; lacks SGND pin and soft-start sequencing control. | Preferred where higher frequency and smaller inductors are prioritized over 600-mA headroom. |
| AP3012KTR-G1 | Fixed 1.3 V output, 1.5-MHz switching, 600-mA max load, 25-µA quiescent current, SOT-23-5 package. | No PFM mode; higher IQ reduces light-load efficiency; no thermal shutdown. | Suitable for cost-sensitive, non-safety-critical consumer devices where thermal margin is adequate. |
Compared with LM3671LC-1.3/NOPB, TPS62231DRYR trades 200 mA load capacity for 1-MHz higher frequency and smaller footprint, while AP3012KTR-G1 matches current rating but sacrifices PFM efficiency and thermal safety - making LM3671LC-1.3/NOPB optimal for battery life and reliability in portable medical and imaging systems.
Availability
LM3671LC-1.3/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and portable medical equipment requiring stable component supply, long-lifecycle support, and automotive-qualified alternatives (LM3671-Q1) for future scalability.
Supply support for LM3671LC-1.3/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 ICs, with decades of expertise in high-efficiency DC-DC conversion for portable and industrial systems.
The LM3671 product line targets space-constrained, battery-powered applications demanding ultra-low quiescent current, automatic mode switching, and minimal external components - designed specifically for mobile handsets, PDAs, and imaging devices.
FAQ
What is the output voltage tolerance of the LM3671LC-1.3/NOPB?
The LM3671LC-1.3/NOPB provides a fixed 1.3 V output with ±4% tolerance over temperature (−40°C to +125°C) and line/load conditions, as specified in the electrical characteristics table for the LC variant. This tolerance is maintained using an internal 0.5 V reference and precision resistor divider, eliminating calibration requirements in end equipment.
Does the LM3671LC-1.3/NOPB require external feedback resistors?
No, the LM3671LC-1.3/NOPB does not require external feedback resistors. It is a fixed-output variant with internal resistor dividers configured for 1.3 V; the FB pin is internally connected and must be tied directly to VOUT. External resistors are only needed for the adjustable (ADJ) versions like LM3671MF-ADJ.
What package type is used for the LM3671LC-1.3/NOPB?
The LM3671LC-1.3/NOPB is packaged in a 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm with wettable flanks. This ultra-compact, leadless package supports high-density layouts and automated optical inspection, and is distinct from the SOT-23-5 and DSBGA-5 variants offered in the LM3671 family.
How does the LM3671LC-1.3/NOPB handle thermal overload?
The LM3671LC-1.3/NOPB incorporates internal thermal shutdown that activates at approximately 150°C junction temperature and releases at 130°C. During overload, it cycles on/off to limit average power dissipation. This protection is independent of current limiting and operates even if the EN pin remains asserted, ensuring robustness in sustained high-temperature environments.
Can the LM3671LC-1.3/NOPB operate from a 2.5 V input?
No, the LM3671LC-1.3/NOPB requires a minimum input voltage of 2.7 V per its recommended operating conditions. At inputs below 2.7 V, undervoltage lockout disables switching, and the device will not regulate. TI explicitly recommends keeping the device in shutdown until VIN reaches 2.7 V or higher to ensure reliable startup behavior.
LM3671LC-1.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-UFDFN
- 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):
- 1.3V
- 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:
- 6-USON (2x2)
LM3671LC-1.3/NOPB FAQ
1.How can I place an order for LM3671LC-1.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671LC-1.3/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 LM3671LC-1.3/NOPB reliable?
The price and inventory of LM3671LC-1.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671LC-1.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671LC-1.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671LC-1.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671LC-1.3/NOPB?
LM3671LC-1.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671LC-1.3/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 LM3671LC-1.3/NOPB?
For technical support, including LM3671LC-1.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671LC-1.3/NOPB requirements.
6.How does Aetrix verify that LM3671LC-1.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671LC-1.3/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 LM3671LC-1.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671LC-1.3/NOPB?
All LM3671LC-1.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671LC-1.3/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 LM3671LC-1.3/NOPB part is unused and in its original packaging.
Return procedure for LM3671LC-1.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671LC-1.3/NOPB Tags
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TPS562201DDCR
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MC33063ADR
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MC34063EBD-TR
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