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Texas Instruments LM2670SX-5.0/NOPB
- Part No.:
- LM2670SX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2670SX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,275
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Product details
Overview
LM2670SX-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3 A output current with fixed 5 V output, 8–40 V input range, 260 kHz internal oscillator, ±2% output voltage tolerance, and 150 mΩ DMOS high-side switch - used in battery chargers, communications power supplies, and system preregulators.
For engineers reviewing the LM2670SX-5.0/NOPB datasheet, LM2670SX-5.0/NOPB pinout, LM2670SX-5.0/NOPB application, or LM2670SX-5.0/NOPB equivalent, key selection criteria include input voltage range, standby current, sync capability, thermal performance in TO-263 package, and fixed-output regulation accuracy under full load and temperature.
Technical Context
The LM2670SX-5.0/NOPB integrates a 150 mΩ DMOS high-side switch, PWM controller with 260 kHz fixed-frequency oscillator, and internal feedback reference for 5 V regulation. It supports external synchronization (280–400 kHz), enabling precise ripple frequency control for EMI-sensitive radio and comms systems.
Its functional modes include active regulation (ON/OFF ≥1.4 V) and shutdown (ON/OFF ≤0.8 V), drawing only 50 µA standby current. Thermal shutdown, current limiting, and bootstrapped gate drive (via CBOOST/CB pin) ensure robust operation across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line, load, and –40°C to 125°C junction temperature - ensures stable rail for downstream logic or analog circuitry without external resistor divider. |
| Input Voltage Range | 8 V to 40 V - supports wide industrial, automotive, and telecom input sources including unregulated 12/24 V rails and battery packs. |
| Max Output Current | 3 A continuous - enables single-regulator power delivery for mid-power subsystems like FPGA I/O banks or RF front-end biasing. |
| Switch RDS(ON) | 150 mΩ typical - minimizes conduction loss at full load, contributing to >88% efficiency at 12 VIN/5 VOUT/3 A. |
| Standby Current | 50 µA max when ON/OFF pin = 0 V - allows low-power system sleep states without auxiliary LDOs or manual disconnect. |
| Oscillator Frequency | 260 kHz fixed internal frequency - sets baseline switching period; externally synchronizable to 280–400 kHz for EMI filtering alignment or multi-rail phase control. |
| Thermal Shutdown | Integrated protection - disables switching above safe junction temperature, preventing damage during overload or poor heatsinking in TO-263 package. |
Pinout & Package
LM2670SX-5.0/NOPB is supplied in the KTW (TO-263-7) thermally enhanced surface-mount package (10.1 mm × 15.24 mm), featuring an exposed thermal pad electrically connected to GND for efficient PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch_output) | High-side MOSFET drain node | Switching node connecting to inductor and Schottky diode cathode; carries high dv/dt and peak currents - requires tight layout and ground plane isolation. |
| 2 (Input) | Main power input | Connects to 8–40 V supply and input bypass capacitor; path to GND must be short to minimize high-frequency loop inductance and input ripple. |
| 3 (CBOOST/CB) | Bootstrap capacitor terminal | Accepts 100 nF ceramic capacitor between this pin and Switch_output to generate gate drive voltage >VIN for full MOSFET enhancement. |
| 4 (GND) | Power ground reference | Primary return path for input/output capacitors, thermal pad, and internal circuitry - must connect directly to large copper pour for thermal and noise control. |
| 5 (SYNC) | External clock input | Accepts TTL/CMOS clock (280–400 kHz) to override internal oscillator; enables synchronized ripple for predictable EMI filtering and multi-phase coordination. |
| 6 (Feedback/FB) | Regulation sense input | Internally tied to 5 V reference; connect directly to output capacitor for fixed 5 V operation - no external resistors required. |
| 7 (ON/OFF) | Enable/disable control | Logic-level input: ≥1.4 V enables regulation; ≤0.8 V forces shutdown with 50 µA quiescent draw - supports system-level power sequencing and sleep mode control. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5 V output with ±2% tolerance | Eliminates need for external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing compliance with 5 V logic and interface standards. |
| 150 mΩ DMOS high-side switch | Reduces conduction loss at 3 A load, enabling >88% efficiency at 12 V input and simplifying thermal design in compact TO-263 packages. |
| External sync capability (280–400 kHz) | Allows precise control of switching frequency for EMI spectrum positioning and coordinated operation with other synchronized converters in multi-rail systems. |
| 50 µA shutdown current | Enables ultra-low-power system standby without secondary regulators or mechanical switches - critical for battery-powered or energy-harvesting applications. |
| Integrated thermal shutdown & current limit | Provides autonomous fault protection without external sensing circuitry, improving reliability in unattended or harsh-environment deployments. |
Applications
| Battery Charger Preregulator | Communications Equipment Power |
|---|---|
Use Scenario: Step-down conversion from 24 V battery or adapter to stable 5 V for charging ICs and USB-PD controllers in portable test equipment. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 5 V rail with minimal external components and built-in thermal protection. Use Value: Delivers 3 A at >88% efficiency with 50 µA shutdown, extending runtime in battery-backed systems while maintaining ±2% output accuracy across temperature. | Use Scenario: Powering RF transceivers and baseband processors in LTE small cells where EMI must be tightly controlled and synchronized with other system clocks. IC Role / Device Role / Timing Role: Synchronized buck converter operating at externally locked 350 kHz to align ripple harmonics with system clock domain and simplify EMI filter design. Use Value: Enables consistent ripple frequency positioning via SYNC pin, reducing conducted emissions and easing FCC/CE certification without adding complex spread-spectrum circuitry. |
| Industrial Sensor Hub Supply | Legacy System Voltage Translation |
Use Scenario: Generating clean 5 V from variable 12–36 V industrial bus for microcontroller, ADC, and isolated I/O in factory automation nodes. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck regulator with integrated current limit and thermal shutdown for unattended operation in DIN-rail enclosures. Use Value: Maintains regulation across 8–40 V input range and –40°C to 125°C ambient, eliminating need for pre-regulation stages and supporting long-term deployment in harsh environments. | Use Scenario: Replacing aging linear regulators (e.g., 7805) in legacy embedded systems requiring 5 V at >1 A, where board space and thermal management are constrained. IC Role / Device Role / Timing Role: Drop-in-capable switching alternative offering 9× higher efficiency than linear solutions, reducing heatsink size and system power dissipation. Use Value: Achieves >88% efficiency at 3 A versus <40% for linear regulators, cutting thermal load by >5 W and enabling retrofit into space-limited PCB footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671MX-5.0/NOPB | Same pinout, 1 A output rating, lower RDS(ON) (200 mΩ), no SYNC pin | Suitable for lower-current (<1 A) designs where sync is unnecessary and thermal budget is tighter | Select when load current ≤1 A and external synchronization is not required - reduces cost and complexity. |
| TPS54302DDAR | 3 A output, 4.5–28 V input, 500 kHz switching, integrated compensation, no thermal pad | Better suited for compact layouts with limited copper area; lacks TO-263 thermal performance at full load | Choose for space-constrained designs needing higher frequency and smaller magnetics, accepting reduced thermal headroom vs. LM2670SX-5.0/NOPB. |
Compared with LM2670SX-5.0/NOPB, LM2671MX-5.0/NOPB offers identical functionality at lower current and cost but omits sync capability, while TPS54302DDAR provides higher switching frequency and integration at the expense of thermal performance in high-power, high-ambient scenarios.
Availability
LM2670SX-5.0/NOPB is available at Aetrix Electronics and suitable for battery chargers, communications equipment power supplies, and industrial sensor hub designs requiring stable component supply, long-term manufacturability, and thermal robustness in TO-263 packaging.
Supply support for LM2670SX-5.0/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, high-efficiency buck conversion using off-the-shelf external components and WEBENCH® design support.
FAQ
What is the maximum input voltage rating for the LM2670SX-5.0/NOPB?
The LM2670SX-5.0/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range of 8 V to 40 V. Exceeding 40 V continuously risks exceeding thermal limits and degrading long-term reliability, even if within absolute max ratings. The device is optimized for industrial and telecom inputs, not automotive cold-crank transients.
Does the LM2670SX-5.0/NOPB require external feedback resistors for 5 V output?
No, the LM2670SX-5.0/NOPB is a fixed 5 V output variant - its internal feedback network is trimmed to deliver 5.0 V ±2% without external resistors. Pin 6 (FB) must be connected directly to the output capacitor; adding external dividers will disrupt regulation and cause overvoltage.
Can the LM2670SX-5.0/NOPB be synchronized to an external clock?
Yes, the LM2670SX-5.0/NOPB supports external synchronization via Pin 5 (SYNC). An AC-coupled TTL/CMOS clock signal between 280 kHz and 400 kHz can override the internal 260 kHz oscillator, enabling precise ripple frequency control for EMI management in communications systems.
What thermal performance can be expected from the LM2670SX-5.0/NOPB in its TO-263 package?
In the KTW (TO-263-7) package with proper PCB copper area (≥0.4896 in² of 1 oz copper), the LM2670SX-5.0/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 35°C/W. At 3 A output and 12 V input, this enables reliable operation up to ~70°C ambient without forced air, assuming adequate ground-pad soldering.
How does the ON/OFF pin function on the LM2670SX-5.0/NOPB?
The ON/OFF pin (Pin 7) enables logic-level control: ≥1.4 V turns the LM2670SX-5.0/NOPB on; ≤0.8 V forces shutdown with 50 µA quiescent current. It features an internal 20 µA pull-up and 7 V Zener clamp - direct connection to MCU GPIO is safe, and floating the pin defaults to enabled operation.
LM2670SX-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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):
- 5V
- 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:
- TO-263 (DDPAK-7)
LM2670SX-5.0/NOPB FAQ
1.How can I place an order for LM2670SX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SX-5.0/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 LM2670SX-5.0/NOPB reliable?
The price and inventory of LM2670SX-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2670SX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670SX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SX-5.0/NOPB?
LM2670SX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SX-5.0/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 LM2670SX-5.0/NOPB?
For technical support, including LM2670SX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2670SX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670SX-5.0/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 LM2670SX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670SX-5.0/NOPB?
All LM2670SX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SX-5.0/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 LM2670SX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2670SX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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