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Texas Instruments LM3671LC-1.3
- Part No.:
- LM3671LC-1.3
- Manufacturer:
- Texas Instruments
- Package:
- 6-UFDFN
- Datasheet:
-
LM3671LC-1.3.pdf
- Description:
- IC REG BUCK 1.3V 600MA 6USON
- Quantity:
- Payment:
- Shipping:
Inventory:4,697
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Product details
Overview
LM3671LC-1.3 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, internal soft start, and automatic PFM-PWM mode switching - enabling efficient power delivery in mobile phones, MP3 players, and digital still cameras.
For engineers reviewing the LM3671LC-1.3 datasheet, LM3671LC-1.3 pinout, LM3671LC-1.3 application, or LM3671LC-1.3 equivalent, key selection criteria include output voltage accuracy (±4% over temperature), 2.7 V to 5.5 V input range, thermal shutdown at 150°C (typical), and USON-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3671LC-1.3 employs voltage-mode PWM control with input voltage feed-forward compensation to maintain tight line regulation across its 2.7–5.5 V input range. Its internal 0.5 V reference and feedback architecture regulate output by comparing FB voltage against this reference, supporting fixed 1.3 V output via internal resistor divider.
It integrates a PFET high-side switch and NFET synchronous rectifier with typical RDS(ON) of 380 mΩ (PFET) and 250 mΩ (NFET) at 3.6 V, enabling high efficiency without external diodes. Mode transitions between PWM (2 MHz fixed frequency) and PFM (variable frequency, 16 µA IQ) are fully autonomous based on load current thresholds and zero-current detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.3 V ±4% over –40°C to +125°C - ensures stable core logic supply for low-voltage ASICs and microcontrollers. |
| Input Voltage Range | 2.7 V to 5.5 V - supports direct operation from single Li-Ion (2.7–4.2 V) or regulated 3.3/5 V rails. |
| Max Load Current | 600 mA - sufficient for RF transceivers, camera modules, and baseband processors in handheld devices. |
| Switching Frequency | 2 MHz (typical, ±0.4 MHz over temp) - enables use of compact 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors. |
| Quiescent Current | 16 µA (typical, no load, PWM/PFM transition) - extends battery life during standby and light-load UI states. |
| Shutdown Current | 0.01 µA (typical) - critical for ultra-low-power wake-on-event architectures in portable instrumentation. |
| Feedback Reference | 0.5 V internal bandgap - sets output via VOUT = VREF × (1 + R1/R2); fixed versions omit external resistors. |
Pinout & Package
LM3671LC-1.3 is housed in a 2.00 mm × 2.00 mm, 0.5 mm profile USON-6 (NKH) package with wettable flanks for automated optical inspection. Thermal performance is characterized by RθJA = 174.7°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V; supplies internal bias and switch drivers. |
| GND | Power Ground | Primary return path for input current, inductor discharge, and IC substrate; must be low-impedance. |
| EN | Digital Enable | Active-high logic input; device enabled when >1 V, shutdown when <0.4 V; must not float. |
| FB | Analog Feedback | Monitors regulated output; internally connected to fixed 1.3 V divider - no external resistors required. |
| SW | Switch Node | Drives external inductor; connects to drain of internal PFET and source of NFET; requires low-ESR ceramic cap to GND. |
| SGND | Signal Ground | Separate ground pin for FB reference; improves regulation accuracy by isolating analog sensing from power return noise. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode; reduces conduction loss and improves full-load efficiency by ≥8% vs. asynchronous designs. |
| Automatic PFM-PWM Transition | Seamlessly shifts modes at ~80 mA load threshold; maintains >85% efficiency from 1 mA to 600 mA without manual control. |
| Integrated Soft Start | Ramps current limit in 70/140/280/1020 mA steps; prevents input rail sag and inrush stress on 10 µF output caps. |
| Thermal & Overcurrent Protection | Shuts down at 150°C (typical) junction temp and limits peak switch current to 1020 mA (open-loop), safeguarding IC and inductor. |
| Ultra-Low Shutdown Current | 0.01 µA typical draw disables all circuitry except EN comparator - essential for battery-backed real-time clocks and sensors. |
Applications
| Mobile Phone Power Rail | MP3 Player Core Supply |
|---|---|
Use Scenario: Powers baseband processor core (1.3 V domain) from a single Li-Ion cell during active call and idle states. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1.3 V with fast transient response to handle burst-mode CPU loads. Use Value: Maintains 1.3 V ±30 mV under 100 mA → 400 mA load steps (20 µs recovery), minimizing brownouts during GSM transmit bursts. | Use Scenario: Supplies 1.3 V to audio codec and flash memory controller in battery-operated MP3 players. IC Role / Device Role / Timing Role: Efficient point-of-load converter enabling >15-hour playback via 16 µA PFM quiescent current. Use Value: Achieves 92% peak efficiency at 100 mA and sustains >80% efficiency down to 1 mA, extending runtime per charge cycle. |
| Digital Still Camera Sensor Bias | Portable Medical Pulse Oximeter |
Use Scenario: Provides clean, low-noise 1.3 V bias to CMOS image sensor analog front-end during exposure capture. IC Role / Device Role / Timing Role: Low-ripple DC-DC source with 2 MHz switching - keeps switching harmonics outside sensor ADC sampling band. Use Value: Delivers <15 mVPP output ripple (10 µF COUT) and suppresses EMI via controlled SW edge rates, preserving image SNR. | Use Scenario: Powers 1.3 V microcontroller and LED driver in handheld pulse oximeters requiring FDA-compliant reliability. IC Role / Device Role / Timing Role: Safety-aware power stage with thermal shutdown and current limiting for Class II medical devices. Use Value: Complies with IEC 60601-1 leakage and fault safety requirements via integrated protection and AEC-Q100-qualified process (LM3671-Q1 variant). |
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 IQ, 2-mm × 2-mm WSON-6 package. | Higher frequency allows smaller 1-µH inductor but lower max current; less suitable for 600-mA camera flash drivers. | Select when board space is tighter and peak load ≤400 mA; verify thermal margin with RθJA = 194°C/W. |
| AP63202WU-13 | Fixed 1.3 V, 2-MHz, 600-mA, 25-µA IQ, 2-mm × 2-mm TSOT23-6 package; no SGND pin. | Lacks dedicated signal ground - may reduce regulation accuracy in noisy mixed-signal layouts. | Prefer for cost-sensitive consumer designs where layout-controlled grounding suffices and SGND isolation is non-critical. |
Compared with TPS62231DRYR and AP63202WU-13, LM3671LC-1.3 provides superior light-load efficiency via lower IQ (16 µA vs. 17/25 µA), guaranteed 600-mA capability, and SGND separation for precision feedback - making it optimal for battery-critical portable instrumentation.
Availability
LM3671LC-1.3 is available at Aetrix Electronics and suitable for mobile phone power management, portable medical instrumentation, and digital camera subsystems requiring stable component supply across multi-year production cycles.
Supply support for LM3671LC-1.3 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 where efficiency, size, and reliability are paramount.
FAQ
What is the recommended input capacitor for LM3671LC-1.3?
The LM3671LC-1.3 datasheet specifies a 4.7 µF X5R/X7R ceramic capacitor at the VIN pin, placed as close as possible to the VIN and GND pins. This value ensures stable operation across the 2.7–5.5 V input range and suppresses high-frequency switching noise. Larger values (e.g., 10 µF) may improve line transient response but are not required for basic functionality. The LM3671LC-1.3 does not require bulk electrolytic input capacitance due to its high PSRR and internal compensation.
Does LM3671LC-1.3 require an external feedback resistor network?
No, LM3671LC-1.3 does not require external feedback resistors. As a fixed-output variant, it uses an internal resistor divider to set the regulated output to 1.3 V. The FB pin is internally connected to this divider and must be directly tied to the output capacitor's VOUT node - no external components are needed. This simplifies layout and eliminates resistor tolerance errors that affect adjustable versions like LM3671MF-ADJ.
What is the thermal shutdown behavior of LM3671LC-1.3?
The LM3671LC-1.3 activates thermal shutdown at approximately 150°C junction temperature (typical) and resumes normal operation once the junction cools to ~130°C (typical). During shutdown, the device halts switching, disables both PFET and NFET, and draws only 0.01 µA. Recovery is automatic and does not require cycling EN. This protects the LM3671LC-1.3 and surrounding components during sustained overload or poor PCB thermal design.
Can LM3671LC-1.3 operate with a 2.2 µH inductor?
Yes, LM3671LC-1.3 is specifically characterized and optimized for use with a 2.2 µH shielded power inductor, as shown in all typical application circuits. TI recommends low-DCR, high-SRF inductors such as the LQM2HPN2R2MJ0L (Murata) or XAL4020-222MEC (Coilcraft). Using 2.2 µH enables full 600-mA capability while maintaining 2-MHz operation and meeting ripple and transient specifications defined in the LM3671LC-1.3 datasheet.
Is LM3671LC-1.3 qualified for automotive applications?
The LM3671LC-1.3 itself is not AEC-Q100 qualified; however, the pin-compatible LM3671-Q1 variant (e.g., LM3671Q1LC-1.3) is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient) and undergoes automotive-specific stress testing. For non-automotive portable equipment - including consumer, medical, and industrial - the standard LM3671LC-1.3 meets all functional and reliability requirements stated in its production datasheet.
LM3671LC-1.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM3671LC-1.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671LC-1.3 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 reliable?
The price and inventory of LM3671LC-1.3 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 is usually 5 days.
3.What payment methods are accepted for LM3671LC-1.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671LC-1.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671LC-1.3?
LM3671LC-1.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671LC-1.3 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?
For technical support, including LM3671LC-1.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671LC-1.3 requirements.
6.How does Aetrix verify that LM3671LC-1.3 is sourced from the original manufacturer or authorized distributors?
All LM3671LC-1.3 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 meets industry standards.
7.What is the process for return or replacement of LM3671LC-1.3?
All LM3671LC-1.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM3671LC-1.3, 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 part is unused and in its original packaging.
Return procedure for LM3671LC-1.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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