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Texas Instruments LM2670SDX-3.3/NOPB
- Part No.:
- LM2670SDX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2670SDX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,603
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Product details
Overview
LM2670SDX-3.3/NOPB from Texas Instruments is a monolithic step-down (buck) DC/DC switching regulator delivering up to 3 A output current with fixed 3.3 V output, 8–40 V input range, 260 kHz internal oscillator, ±2% output voltage tolerance, and 150 mΩ high-side DMOS switch. It serves as a high-efficiency (>90%) system preregulator in industrial power supplies and communications equipment.
For engineers reviewing the LM2670SDX-3.3/NOPB datasheet, LM2670SDX-3.3/NOPB pinout, LM2670SDX-3.3/NOPB application, or LM2670SDX-3.3/NOPB equivalent, key selection criteria include its 3.3 V fixed output accuracy, external sync capability (280–400 kHz), 50 µA standby current, thermal shutdown protection, and TO-263-7 (KTW) package suitability for high-current PCB layouts.
Technical Context
The LM2670SDX-3.3/NOPB implements a voltage-mode PWM buck controller with an integrated 150 mΩ high-side DMOS FET, fixed 260 kHz oscillator, and internal feedback divider for 3.3 V regulation. Its synchronous-capable architecture supports external clock synchronization above 280 kHz to control ripple frequency and EMI profile.
It features ON/OFF enable logic with 1.4 V threshold, thermal shutdown, cycle-by-cycle current limiting (3.8–5.25 A), and bootstrapped gate drive via CBOOST. The device operates across –40°C to 125°C junction temperature and maintains ±2% output tolerance over full line, load, and temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% (3.234–3.366 V at 25°C; 3.201–3.399 V over –40°C to 125°C) |
| Input Voltage Range | 8 V to 40 V - supports wide industrial and battery-derived inputs without pre-regulation |
| Max Output Current | 3 A continuous - enables single-chip conversion for mid-power subsystems |
| Switching Frequency | 260 kHz fixed internal oscillator - balances efficiency, size, and EMI; externally synchronizable to 280–400 kHz |
| Efficiency | Up to 94% (at 12 VIN/3 A for 12 V version; ≥86% typical for 3.3 V version at 12 VIN/3 A) |
| Quiescent Current | 6 mA active; 50 µA standby - enables low-power hold modes in always-on systems |
| RDS(ON) | 0.15 Ω typical - minimizes conduction loss and thermal rise at full load |
Pinout & Package
LM2670SDX-3.3/NOPB is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, measuring 10.1 mm × 15.24 mm. The package supports high-current thermal dissipation when soldered to a large copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal high-side DMOS FET; connects directly to inductor and Schottky diode cathode - high dv/dt node requiring tight layout |
| 2 (VIN) | Input supply | Main power input (8–40 V); must be bypassed with low-ESR capacitor placed adjacent to pin to minimize noise and voltage drop |
| 3 (CBOOST) | Bootstrap capacitor | Connects 100 nF capacitor to SW pin to generate gate drive voltage > VIN for full FET enhancement |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and thermal pad; requires low-inductance connection to system ground plane |
| 5 (SYNC) | Synchronization input | Accepts external TTL/CMOS clock (280–400 kHz); overrides internal oscillator for EMI control and spectral positioning |
| 6 (FB) | Feedback sense | Internally connected to 3.3 V divider - shorted directly to output capacitor for fixed-output operation; no external resistors needed |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4 V = ON, ≤0.8 V = OFF; draws only 50 µA in shutdown - supports microcontroller-controlled power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150 mΩ high-side DMOS switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity while maintaining >90% efficiency at 3 A |
| Fixed 3.3 V output with ±2% tolerance | Guarantees stable core voltage for microcontrollers and FPGAs without external feedback resistors or calibration |
| External synchronization (280–400 kHz) | Enables deterministic ripple frequency placement for consistent EMI filtering and compliance testing across multiple boards |
| 50 µA standby quiescent current | Supports ultra-low-power sleep states in battery-backed or energy-harvesting systems without auxiliary LDOs |
| Built-in protection suite | Includes thermal shutdown, cycle-by-cycle current limiting (3.8–5.25 A), and under-voltage lockout - reduces need for external fault management circuitry |
Applications
| Industrial Power Preregulation | Communications Equipment Supply |
|---|---|
|
Use Scenario: Converting 24 V or 36 V rail to 3.3 V for FPGA I/O banks and peripheral logic in programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 3.3 V with tight tolerance and low noise for digital logic domains. Use Value: Delivers 3 A continuously with <1% output ripple (with proper COUT/ESR), eliminating need for post-regulation LDOs and saving board space. |
Use Scenario: Powering RF transceiver modules and baseband processors in cellular infrastructure radios where EMI must meet FCC Part 15 Class B limits. IC Role / Device Role / Timing Role: Synchronized buck converter operating at 350 kHz to fix switching noise away from sensitive IF bands. Use Value: External SYNC pin allows precise ripple frequency control, enabling repeatable filter design and simplified EMI certification. |
| Battery Charger Front-End | Automotive Infotainment System |
|
Use Scenario: Stepping down variable 9–32 V automotive battery or Li-ion pack voltage to stable 3.3 V for charging controller MCU and USB interface ICs. IC Role / Device Role / Timing Role: Wide-input buck regulator with thermal shutdown and current limit - handles cold-crank and load-dump transients safely. Use Value: 8–40 V input range and –40°C to 125°C operation ensure reliable startup and regulation across automotive ambient conditions. |
Use Scenario: Supplying 3.3 V to display timing controllers and audio codecs in head-unit designs where space and thermal constraints are critical. IC Role / Device Role / Timing Role: High-current, surface-mount DC/DC converter mounted directly on main PCB with thermal pad tied to internal ground plane. Use Value: TO-263-7 package with exposed thermal pad achieves ≤35°C/W junction-to-ambient (with 1.0 in² copper), enabling fanless operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671SD-3.3/NOPB | Same pinout, 1 A max output (vs. 3 A), lower RDS(ON) (120 mΩ), same 3.3 V fixed output and SYNC capability | Suitable for low-power peripherals (e.g., sensors, UART interfaces) but insufficient for 3 A loads like DDR memory or high-speed SerDes | Select when load current ≤1 A and board space or cost optimization is prioritized over headroom |
| TPS54332DR | 3 A, adjustable output (0.8–28 V), 1 MHz switching, integrated soft-start, but no SYNC input or thermal pad in SOIC-8 | Offers higher frequency for smaller magnetics but lacks EMI-synchronized operation and has higher thermal resistance (≈65°C/W) | Prefer when compact inductor size is critical and EMI spectrum control is secondary to footprint reduction |
Compared with LM2670SDX-3.3/NOPB, LM2671SD-3.3/NOPB trades current capability for lower cost and smaller solution size, while TPS54332DR offers higher switching frequency and flexibility at the expense of synchronized EMI control and thermal performance.
Availability
LM2670SDX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2670SDX-3.3/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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, minimal external component count, and robust performance in industrial and communications power supplies.
FAQ
What is the maximum input voltage rating for the LM2670SDX-3.3/NOPB?
The absolute maximum input voltage for LM2670SDX-3.3/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Operation beyond 40 V risks exceeding safe operating area limits and may trigger internal protection circuits. For sustained reliability, maintain VIN ≤40 V under all conditions including transients.
Does the LM2670SDX-3.3/NOPB require external feedback resistors?
No - the LM2670SDX-3.3/NOPB integrates precision feedback resistors for its fixed 3.3 V output. Pin 6 (FB) must be connected directly to the output capacitor; no external resistor divider is needed. This simplifies layout and eliminates resistor tolerance errors affecting output accuracy.
Can the LM2670SDX-3.3/NOPB synchronize to an external clock below 280 kHz?
No - the LM2670SDX-3.3/NOPB requires an external SYNC signal between 280 kHz and 400 kHz. Signals below 280 kHz may cause erratic operation or failure to lock, as the internal ramp oscillator resets on each SYNC rising edge and cannot reliably track frequencies lower than its internal minimum.
What thermal performance can be expected from the LM2670SDX-3.3/NOPB in TO-263-7 package?
With proper PCB layout - including a 1.0064 in² copper area under the thermal pad connected via ≥12 vias to inner ground layers - the LM2670SDX-3.3/NOPB achieves ≤26°C/W junction-to-ambient thermal resistance. At 3 A load and 12 VIN, this enables full-power operation without heatsink at ambient ≤70°C.
Is the LM2670SDX-3.3/NOPB compatible with ceramic output capacitors?
Yes - LM2670SDX-3.3/NOPB supports ceramic output capacitors, but stability requires careful attention to ESR and capacitance value. TI recommends ≥200 µF total output capacitance with ESR ≤26 mΩ (e.g., parallel 100 µF X7R + 100 µF X5R). Avoid excessively low-ESR ceramics without added damping if loop stability margins are marginal.
LM2670SDX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- 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):
- 8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-VSON (5x6)
LM2670SDX-3.3/NOPB FAQ
1.How can I place an order for LM2670SDX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SDX-3.3/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 LM2670SDX-3.3/NOPB reliable?
The price and inventory of LM2670SDX-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2670SDX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670SDX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SDX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SDX-3.3/NOPB?
LM2670SDX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SDX-3.3/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 LM2670SDX-3.3/NOPB?
For technical support, including LM2670SDX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SDX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2670SDX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670SDX-3.3/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 LM2670SDX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670SDX-3.3/NOPB?
All LM2670SDX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SDX-3.3/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 LM2670SDX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2670SDX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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