My Inquiry
My Account
Texas Instruments LM3671LC-1.6
- Part No.:
- LM3671LC-1.6
- Manufacturer:
- Texas Instruments
- Package:
- 6-UFDFN
- Datasheet:
-
LM3671LC-1.6.pdf
- Description:
- IC REG BUCK 1.6V 600MA 6USON
- Quantity:
- Payment:
- Shipping:
Inventory:4,294
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3671LC-1.6 from Texas Instruments is a fixed-output 1.6 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 high efficiency in mobile phones, digital cameras, and handheld medical devices.
For engineers reviewing the LM3671LC-1.6 datasheet, LM3671LC-1.6 pinout, LM3671LC-1.6 application, or LM3671LC-1.6 equivalent, key selection considerations include its 2.7–5.5 V input range, 1.6 V fixed output, USON-6 package footprint, thermal shutdown protection, and compatibility with only three external components (2.2 µH inductor + two ceramic capacitors).
Technical Context
The LM3671LC-1.6 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, enabling precise 1.6 V output with ±4% tolerance over temperature.
It integrates a PFET high-side switch (RDSON = 380–500 mΩ) and NFET synchronous rectifier (RDSON = 250–400 mΩ), eliminating external diode losses. Mode transitions between PWM (2 MHz fixed frequency) and PFM (variable frequency, 16 µA IQ) occur automatically at ~80 mA load threshold, balancing noise performance and light-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.6 V ±4% - eliminates need for external resistor divider; supports stable core logic or I/O rail in space-constrained designs. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-Ion (2.7–4.2 V), Li-Polymer, or regulated 3.3/5 V rails without external pre-regulation. |
| Max Output Current | 600 mA - sufficient for powering ARM Cortex-M microcontrollers, camera sensors, or RF transceivers directly. |
| Switching Frequency | 2 MHz (typical) - enables use of ultra-small 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors, minimizing board area. |
| Quiescent Current | 16 µA (typical, PFM mode) - extends battery runtime in standby or low-activity states (e.g., Bluetooth LE sleep cycles). |
| Shutdown Current | 0.01 µA (typical) - ensures negligible battery drain during full system power-off in portable instruments. |
| Protection Features | Thermal shutdown (150°C trip), current limiting (1020 mA open-loop peak), undervoltage lockout - prevents damage under fault or cold-start conditions. |
Pinout & Package
LM3671LC-1.6 is housed in a 2.00 mm × 2.00 mm, 0.5 mm pitch, 6-pin USON (NKH) package with wettable flanks for automated optical inspection. The package is RoHS-compliant and moisture-sensitive level 1 (MSL-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary supply connection; must be decoupled with ≥4.7 µF ceramic capacitor close to pin to suppress high-frequency switching noise. |
| GND | Power Ground | System ground return path for input and output currents; requires low-impedance PCB plane connection to minimize noise coupling. |
| EN | Digital Enable | Active-high logic control (VIH ≥ 1 V, VIL ≤ 0.4 V); floating state disables device - must be tied to VIN or controlled by host MCU GPIO. |
| FB | Feedback Input | Internally connected to 1.6 V output divider; no external resistors required - simplifies layout and improves accuracy vs adjustable versions. |
| SW | Switch Node | Connection to internal PFET drain and NFET source; routes high dv/dt switching waveform - requires short, wide trace and careful routing away from sensitive analog nodes. |
| SGND | Signal Ground | Separate feedback ground reference; must be connected to main GND at single point near FB pin to avoid sensing errors from ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode, reducing conduction loss and improving full-load efficiency by up to 8% vs asynchronous buck topologies. |
| Automatic PFM-PWM Transition | Seamlessly shifts between 2 MHz PWM (low-noise, high-accuracy regulation) and variable-frequency PFM (16 µA IQ) at ~80 mA load - no external control needed. |
| Integrated Soft Start | Ramps output voltage over ~275–400 µs (depending on COUT and load) to limit inrush current and prevent input rail collapse during power-up. |
| Three-Component Solution | Requires only one 2.2 µH inductor and two ceramic capacitors (CIN = 4.7 µF, COUT = 10 µF) - reduces BOM count, cost, and PCB area vs competing converters. |
| Thermal & Overcurrent Protection | Shuts down at 150°C junction temperature and limits peak switch current to 1020 mA - protects IC and external components during overload or poor heatsinking. |
Applications
| Mobile Phone Power Management | Digital Still Camera Core Supply |
|---|---|
Use Scenario: Powering baseband processor I/O banks and display interface circuitry in slim smartphone designs. IC Role / Device Role / Timing Role: Primary 1.6 V buck regulator delivering clean, regulated voltage with fast transient response to dynamic CPU load changes. Use Value: Enables compact layout using 2.2 µH inductor and avoids need for post-regulation LDOs - saving board space and improving system efficiency. | Use Scenario: Supplying image sensor analog front-end and ISP core logic in battery-operated digital cameras. IC Role / Device Role / Timing Role: Fixed 1.6 V output stage providing low-noise, stable rail during burst capture and video streaming modes. Use Value: Maintains <±1% output regulation under 100 mA–600 mA load steps while consuming only 16 µA in preview standby mode. |
| Handheld Medical Instrumentation | Wireless Home-Automation Sensor Node |
Use Scenario: Powering low-power microcontroller, ADC, and wireless transceiver in portable pulse oximeters or glucose meters. IC Role / Device Role / Timing Role: Main system regulator supporting both active measurement (600 mA peak) and deep-sleep (0.01 µA shutdown) states. Use Value: Achieves >90% efficiency at 100 mA and extends single-cell Li-Ion battery life beyond 12 months in intermittent-use applications. | Use Scenario: Supplying Zigbee or Thread SoC and environmental sensors in battery-powered smart thermostats or door/window sensors. IC Role / Device Role / Timing Role: Efficient 1.6 V rail generator that remains in PFM mode during 99% of operation (µA-level sleep current) and wakes instantly on interrupt. Use Value: Delivers 16 µA quiescent current in PFM and supports rapid load-step response (<10 µs) to enable sub-second sensor wake-and-report cycles. |
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 | 1.6 V fixed output, 2.25 MHz switching, 600 mA rating, 17 µA IQ - nearly identical electrical specs but uses 2-mm × 2-mm WSON package with different pinout (EN/FB swapped). | Same target applications; requires PCB redesign due to non-pin-compatible layout and different thermal pad configuration. | Select if requiring TI's newer process node or tighter output tolerance (±1.5% vs ±4%), but verify EN/FB routing and thermal relief design. |
| AP63202WU-16 | 1.6 V fixed output, 2 MHz, 600 mA, 22 µA IQ - uses TSOT23-6 package; lacks integrated soft start and has higher RDSON (PFET: 550 mΩ). | Suitable for cost-sensitive industrial controls where soft start is not critical; less ideal for battery-critical portable devices due to higher light-load IQ. | Choose for legacy TSOT23 footprint compatibility or price-driven BOM optimization - accept trade-offs in startup behavior and efficiency below 50 mA. |
Compared with TPS62231DRYR and AP63202WU-16, the LM3671LC-1.6 offers superior light-load efficiency (16 µA vs 17–22 µA), guaranteed soft start, and USON packaging optimized for automated assembly and thermal performance - making it preferred for high-reliability portable consumer electronics.
Availability
LM3671LC-1.6 is available at Aetrix Electronics and suitable for mobile phone power management, digital still camera core supply, and handheld medical instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3671LC-1.6 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 automotive systems.
The LM3671 product line was designed specifically for space-constrained, battery-powered portable electronics - delivering high integration, minimal external component count, and robust protection in ultra-small packages like USON and DSBGA.
FAQ
What is the recommended input capacitor for LM3671LC-1.6?
The LM3671LC-1.6 datasheet specifies a minimum 4.7 µF X5R/X7R ceramic capacitor at the VIN pin, placed as close as possible to the device. This value ensures stable operation across the 2.7–5.5 V input range and suppresses high-frequency ripple generated by the 2 MHz switching action. Larger values (e.g., 10 µF) improve line transient response but are not required for basic functionality. The LM3671LC-1.6 does not require bulk electrolytic capacitance due to its low ESR ceramic-focused design.
Does LM3671LC-1.6 require an external feedback resistor network?
No, the LM3671LC-1.6 is a fixed-output variant with internal feedback divider set for 1.6 V. The FB pin is internally connected to the output and requires no external resistors - unlike the adjustable LM3671-ADJ version. This simplifies layout, improves output accuracy (±4% over temperature), and eliminates resistor tolerance and thermal drift errors. The LM3671LC-1.6's FB pin must remain unconnected to external components to maintain specified regulation performance.
What thermal performance can be expected from LM3671LC-1.6 in a 4-layer PCB?
In a standard 4-layer PCB with 1 oz copper and thermal vias under the USON-6 exposed pad, the LM3671LC-1.6 exhibits a junction-to-ambient thermal resistance (RθJA) of 174.7°C/W. At 600 mA load and 3.6 V input, typical power dissipation is ~180 mW, resulting in ~31°C junction-to-ambient rise above ambient - well within the –40°C to +125°C operating range. The LM3671LC-1.6 includes thermal shutdown at 150°C (typical) for additional safety margin.
Can LM3671LC-1.6 operate from a 2.5 V input?
No, the LM3671LC-1.6 has a minimum recommended input voltage of 2.7 V per the datasheet's Recommended Operating Conditions table. Operation below 2.7 V may cause undervoltage lockout activation, erratic regulation, or failure to start. While absolute maximum ratings allow 2.5 V transiently, sustained operation at 2.5 V is outside specification and risks output dropout or instability - especially under load. For 2.5 V input systems, consider the LM3671MF-1.5 or other lower-VIN buck converters.
How does LM3671LC-1.6 handle load transients?
The LM3671LC-1.6 delivers fast load transient response due to its 2 MHz fixed-frequency PWM mode and voltage-mode control architecture. From 10 mA to 600 mA load steps, typical output deviation is <±30 mV with recovery time <10 µs when using the recommended 2.2 µH inductor and 10 µF output capacitor. In PFM mode (light loads), response is slightly slower but still maintains <±50 mV deviation thanks to hysteresis-based comparator thresholds. The LM3671LC-1.6's internal soft start and current limiting further ensure stable behavior during startup and overload events.
LM3671LC-1.6 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):
- 1.6V
- 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 FAQ
1.How can I place an order for LM3671LC-1.6 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671LC-1.6 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 reliable?
The price and inventory of LM3671LC-1.6 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 is usually 5 days.
3.What payment methods are accepted for LM3671LC-1.6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671LC-1.6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671LC-1.6?
LM3671LC-1.6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671LC-1.6 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?
For technical support, including LM3671LC-1.6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671LC-1.6 requirements.
6.How does Aetrix verify that LM3671LC-1.6 is sourced from the original manufacturer or authorized distributors?
All LM3671LC-1.6 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 meets industry standards.
7.What is the process for return or replacement of LM3671LC-1.6?
All LM3671LC-1.6 units undergo pre-shipment inspection (PSI). If there is an issue with LM3671LC-1.6, 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 part is unused and in its original packaging.
Return procedure for LM3671LC-1.6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671LC-1.6 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
