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Texas Instruments LM3671LC-1.6/NOPB
- Part No.:
- LM3671LC-1.6/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-UFDFN
- Datasheet:
-
LM3671LC-1.6/NOPB.pdf
- Description:
- IC REG BUCK 1.6V 600MA 6USON
- Quantity:
- Payment:
- Shipping:
Inventory:1,485
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Product details
Overview
LM3671LC-1.6/NOPB from Texas Instruments is a fixed-output 1.6 V, 600-mA synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered portable electronics. It operates from 2.7 V to 5.5 V input, delivers 2 MHz fixed-frequency PWM switching with automatic PFM mode transition below ~80 mA load, and achieves 16 µA typical quiescent current in light-load operation - enabling extended battery life in mobile phones and digital cameras.
For engineers reviewing the LM3671LC-1.6/NOPB datasheet, LM3671LC-1.6/NOPB pinout, LM3671LC-1.6/NOPB application, or LM3671LC-1.6/NOPB equivalent, key selection criteria include its USON-6 package footprint, internal 0.5 V reference with ±4% feedback voltage tolerance, 380 mΩ PFET/250 mΩ NFET RDS(ON), thermal shutdown at 150°C (typ), and compatibility with only three external components: one 2.2 µH inductor and two ceramic capacitors.
Technical Context
The LM3671LC-1.6/NOPB implements voltage-mode control with input-voltage feed-forward compensation to maintain stable regulation across 2.7–5.5 V input range. Its integrated PFET/NFET power stage enables synchronous rectification, eliminating external diode losses and supporting >90% peak efficiency at moderate loads.
Functional mode transitions are fully autonomous: PWM mode provides low-noise, constant-frequency regulation above ~80 mA; PFM mode reduces switching frequency and quiescent current to 16 µA (typ) under light loads; shutdown mode draws just 0.01 µA (typ) when EN < 0.4 V. Soft-start limits inrush current via stepped current-limit ramp (70 → 140 → 280 → 1020 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.6 V ±4% (FB internally connected to 0.5 V reference) |
| Max Output Current | 600 mA continuous - supports core logic rails in handheld devices |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-Ion (3.0–4.2 V) and USB-powered systems |
| Switching Frequency | 2 MHz (typ), 1.6–2.6 MHz (min/max) - enables use of 2.2 µH inductor and compact 0402/0603 passives |
| Quiescent Current | 16 µA (typ) in PFM mode - extends standby time in always-on sensors and IoT peripherals |
| Shutdown Current | 0.01 µA (typ) - eliminates battery drain during system sleep |
| RDS(ON) (PFET/NFET) | 380 / 250 mΩ @ 3.6 V - minimizes conduction loss at 600 mA, enabling >88% efficiency at 3.6 VIN/1.6 VOUT |
Pinout & Package
LM3671LC-1.6/NOPB uses the 6-pin USON (NKH) package: 2.00 mm × 2.00 mm body, 0.5 mm pitch, wettable flank terminals. Exposed thermal pad on bottom improves thermal performance (RθJA = 174.7°C/W on 4-layer board).
| 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 | Power ground return for PFET/NFET switches and internal circuitry |
| EN | Digital enable | Active-high logic input; device enabled when >1 V, shutdown when <0.4 V - must not float |
| FB | Feedback node | Internally tied to 0.5 V reference for fixed 1.6 V output; no external resistors required |
| SW | Switching node | Drives external inductor; connects to internal PFET drain and NFET source - requires low-ESR ceramic output cap |
| SGND | Signal ground | Separate analog ground for FB reference; ties to GND externally per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by 5–10% vs asynchronous designs |
| Auto PFM-PWM mode switching | Maintains >85% efficiency from 1 mA to 600 mA load without manual mode control or external circuitry |
| Integrated soft-start | Prevents input inrush current spikes during power-up; start-up time ~275–400 µs depending on COUT and load |
| Thermal & current protection | Thermal shutdown engages at 150°C (typ); cycle-by-cycle current limit protects against short-circuit and overload |
| Ultra-low shutdown current | 0.01 µA (typ) enables true zero-power off-state in battery-backed systems |
Applications
| Mobile Phone Power Rail | Digital Still Camera Core Supply |
|---|---|
Use Scenario: Powers baseband processor or image signal processor (ISP) core requiring stable 1.6 V at up to 400 mA from a single Li-Ion cell. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core voltage; operates in PWM mode during active capture, transitions to PFM during preview/idle. Use Value: Delivers >90% efficiency at 3.6 VIN/1.6 VOUT and 400 mA, minimizing heat in thin form factor while extending talk time via 16 µA light-load IQ. | Use Scenario: Supplies 1.6 V to CMOS image sensor logic and ADC interface in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing low-noise, ripple-controlled supply; synchronized to sensor frame rate via EN pin control. Use Value: 2 MHz switching avoids interference with sensor readout timing; small USON-6 footprint saves PCB area near optical module. |
| Portable Medical Sensor Node | Wireless Home-Automation Controller |
Use Scenario: Powers ultra-low-power microcontroller and analog front-end in wearable ECG patch operating from coin-cell or Li-Poly battery. IC Role / Device Role / Timing Role: Efficient step-down regulator enabling long-term continuous monitoring; enters PFM mode during sensor sleep cycles. Use Value: 16 µA quiescent current extends battery life beyond 1 year; thermal shutdown prevents overheating in sealed enclosure. | Use Scenario: Supplies 1.6 V to Zigbee/Thread SoC and RF transceiver in battery-operated smart switch or thermostat. IC Role / Device Role / Timing Role: Primary power converter for wireless MCU subsystem; shutdown mode activated between BLE advertisements. Use Value: 0.01 µA shutdown current ensures >5-year shelf life; only three external components simplify high-volume SMT assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.6 V output, 600 mA, 3 MHz switching, 17 µA IQ, WSON-6 (2.0 × 2.0 mm) | Higher switching frequency allows smaller inductor; slightly higher IQ in PFM mode | Preferred where board space is constrained and 3 MHz noise can be filtered; same footprint but different pinout (EN/FB swapped) |
| AP63201WU-7 | Fixed 1.6 V output, 600 mA, 2 MHz, 25 µA IQ, TSOT23-6 (2.9 × 1.6 mm) | Larger SOT-23 package; higher quiescent current; no integrated SGND pin | Lower-cost alternative for non-space-constrained designs; requires careful layout to mitigate noise coupling without SGND separation |
Compared with TPS62231DRYR and AP63201WU-7, the LM3671LC-1.6/NOPB offers tighter feedback tolerance (±4% vs ±1.5% and ±2%), dedicated SGND for improved PSRR, and lower shutdown current (0.01 µA vs 0.1 µA and 1 µA), making it optimal for precision, ultra-low-power portable systems.
Availability
LM3671LC-1.6/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 consistent parametric performance across production batches.
Supply support for LM3671LC-1.6/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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer markets.
The LM3671 product line targets ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics - emphasizing minimal external component count, low quiescent current, and robust thermal protection for space- and power-constrained applications.
FAQ
What is the recommended input capacitor for LM3671LC-1.6/NOPB?
The LM3671LC-1.6/NOPB datasheet specifies a 4.7 µF ceramic input capacitor (X5R/X7R, 6.3 V rating) placed close to the VIN and GND pins. This value suppresses input ripple caused by 2 MHz switching and maintains stability under transient load conditions. Larger values (e.g., 10 µF) may improve hold-up time but are not required for basic operation.
Does LM3671LC-1.6/NOPB require an external feedback resistor network?
No. The LM3671LC-1.6/NOPB is a fixed-output variant with internal feedback divider set for 1.6 V. The FB pin is internally connected to the 0.5 V reference, so no external resistors are needed - unlike the adjustable LM3671ADJ version which requires R1/R2 to set VOUT.
What thermal performance can be expected from LM3671LC-1.6/NOPB in USON-6 package?
In a standard 4-layer PCB layout with 1-in² 2-oz copper pour under the exposed thermal pad, the LM3671LC-1.6/NOPB achieves RθJA = 174.7°C/W. At 600 mA output with 3.6 V input, junction temperature rise is ~65°C above ambient - well within the –40°C to +125°C operating range, provided ambient stays ≤85°C.
How does LM3671LC-1.6/NOPB handle short-circuit conditions?
The LM3671LC-1.6/NOPB employs cycle-by-cycle current limiting with a typical peak switch current threshold of 1020 mA. During sustained short-circuit, it enters timed current-limit mode: the NFET remains on longer to allow inductor current decay, preventing thermal runaway. Combined with thermal shutdown at 150°C (typ), this provides robust fault protection without external circuitry.
Can LM3671LC-1.6/NOPB operate from a 2.5 V input source?
No. The absolute minimum input voltage for LM3671LC-1.6/NOPB is 2.7 V per Recommended Operating Conditions. Operation below 2.7 V risks undervoltage lockout activation, unstable regulation, or failure to start. For 2.5 V input systems, consider the LM3671MF-1.5/NOPB (1.5 V fixed) or adjustable variants with lower dropout headroom requirements.
LM3671LC-1.6/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):
- 1.6V
- 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-1.6/NOPB FAQ
1.How can I place an order for LM3671LC-1.6/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671LC-1.6/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-1.6/NOPB reliable?
The price and inventory of LM3671LC-1.6/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-1.6/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671LC-1.6/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671LC-1.6/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671LC-1.6/NOPB?
LM3671LC-1.6/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671LC-1.6/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-1.6/NOPB?
For technical support, including LM3671LC-1.6/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671LC-1.6/NOPB requirements.
6.How does Aetrix verify that LM3671LC-1.6/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671LC-1.6/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-1.6/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671LC-1.6/NOPB?
All LM3671LC-1.6/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671LC-1.6/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-1.6/NOPB part is unused and in its original packaging.
Return procedure for LM3671LC-1.6/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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