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Texas Instruments LM2670SX-5.0
- Part No.:
- LM2670SX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2670SX-5.0.pdf
- Description:
- IC REG BUCK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,928
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Product details
Overview
LM2670SX-5.0 from Texas Instruments is a monolithic 3-A step-down (buck) DC/DC voltage regulator with fixed 5-V output, 8–40 V input range, 260-kHz internal oscillator, ±2% output tolerance over line/load/temperature, and 150-mΩ DMOS high-side switch - used in battery chargers, communications equipment, and industrial power supplies.
For engineers reviewing the LM2670SX-5.0 datasheet, LM2670SX-5.0 pinout, LM2670SX-5.0 application, or LM2670SX-5.0 equivalent, key selection considerations include input voltage range compatibility, thermal performance in TO-263-7 package, standby current under 100 µA, sync capability up to 400 kHz, and fixed-output regulation without external feedback resistors.
Technical Context
The LM2670SX-5.0 implements a synchronous buck topology using an integrated DMOS high-side switch and external Schottky diode (asynchronous), controlled by a fixed-frequency PWM modulator. Its 260-kHz oscillator sets switching timing unless overridden via SYNC pin with external clock (280–400 kHz).
It features ON/OFF control with 1.4-V threshold, internal current limiting (3.6–5.4 A), thermal shutdown, and bootstrapped gate drive for the high-side FET via CBOOST. The device operates across –40°C to 125°C junction temperature and maintains ±2% output accuracy without trimming.
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 - eliminates need for external feedback divider. |
| Input voltage range | 8 V to 40 V - supports wide industrial and automotive battery-derived inputs without pre-regulation. |
| Max output current | 3 A continuous - enables single-chip conversion for mid-power systems without parallel devices. |
| Switch RDS(ON) | 150 mΩ typical at 25°C - reduces conduction loss and improves efficiency at high load currents. |
| Quiescent current | 6 mA typical in active mode; 50 µA in shutdown - minimizes no-load power draw in always-on subsystems. |
| Oscillator frequency | 260 kHz fixed (225–280 kHz over temp) - balances EMI, inductor size, and capacitor ripple requirements. |
| Sync input range | 280–400 kHz - allows precise ripple frequency control for EMI filtering and spectral placement in comms gear. |
Pinout & Package
LM2670SX-5.0 is packaged in TO-263-7 (KTW), a surface-mount thermally enhanced variant of the DDPAK with exposed thermal pad. Package dimensions are 10.10 mm × 8.89 mm, optimized for PCB heat spreading via soldered thermal pad connection to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal DMOS high-side switch - connects directly to inductor and cathode of external Schottky diode; carries high dv/dt switching waveform. |
| 2 (VIN) | Input supply | Main power input (8–40 V); supplies both load path and internal bias - requires low-ESR bypass capacitor placed adjacent to pin. |
| 3 (CBOOST) | Bootstrap capacitor | Connects to SW via 100-nF ceramic capacitor - generates gate drive voltage > VIN to fully enhance high-side FET and minimize RDS(ON). |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and internal circuitry - must be tied to low-impedance PCB ground plane. |
| 5 (SYNC) | External sync input | Accepts TTL/CMOS clock (280–400 kHz) to override internal oscillator - enables deterministic ripple frequency for EMI compliance. |
| 6 (FB) | Feedback input | Internally connected to 5-V output divider - shorted directly to VOUT for fixed 5-V operation; no external resistors required. |
| 7 (ON/OFF) | Enable control | Logic-level enable: ≥1.4 V = active, ≤0.8 V = shutdown (50 µA IQ) - includes internal 20-µA pull-up and 7-V clamp. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency buck regulation | Up to 94% efficiency (at 12-V input, 5-V/5-A output) - reduces thermal load and improves system power density. |
| Integrated high-side DMOS switch | 150-mΩ RDS(ON) - eliminates need for external high-side MOSFET and associated gate driver complexity. |
| Fixed-output simplicity | No external feedback resistors needed for 5-V version - accelerates design, reduces BOM count, and improves production yield. |
| Thermal and overload protection | Built-in thermal shutdown and current limiting (3.6–5.4 A) - prevents damage during fault conditions without external circuitry. |
| Low-quiescent shutdown | 50 µA standby current - enables energy-sensitive applications like battery-backed systems and remote sensors. |
Applications
| Battery Charger Power Stage | Industrial 24-V to 5-V Preregulator |
|---|---|
|
Use Scenario: Charging Li-ion or lead-acid batteries from unregulated 12–36 V sources while maintaining tight 5-V USB-compliant output for auxiliary circuits. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable 5-V rail with current limit and thermal protection during variable load and ambient conditions. Use Value: Delivers 3-A continuous output with <2% regulation error across temperature, enabling reliable USB-PD negotiation and microcontroller operation without additional LDO post-regulation. |
Use Scenario: Converting 24-V factory floor supply to clean 5-V logic rail for PLC I/O modules, sensor interfaces, and communication controllers. IC Role / Device Role / Timing Role: High-current buck converter operating in continuous conduction mode with fixed 260-kHz switching for predictable EMI profile. Use Value: Achieves >90% efficiency at full load, reducing heat sink requirements and enabling compact DIN-rail mounted designs with minimal derating. |
| Communications Equipment Power Supply | Automotive Aftermarket Head Unit Power |
|
Use Scenario: Providing regulated 5-V supply to RF transceivers and baseband processors in two-way radios where EMI must be spectrally controlled. IC Role / Device Role / Timing Role: Synchronized buck regulator locked to system clock (via SYNC pin) to align ripple harmonics and simplify bandpass filtering. Use Value: Enables consistent 280–400 kHz ripple positioning - critical for passing FCC Part 15 Class B conducted emissions limits without iterative filter redesign. |
Use Scenario: Powering infotainment head units from vehicle battery (9–16 V nominal, up to 40 V load dump) with robust transient handling. IC Role / Device Role / Timing Role: Input-tolerant buck controller with built-in current limit and thermal shutdown - withstands cold-crank and load-dump events when paired with appropriate input protection. Use Value: Maintains regulation down to 8-V input and survives 45-V transients, eliminating need for external TVS or pre-regulator stages in cost-sensitive aftermarket designs. |
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 | Same family, but uses external diode + internal switch only; identical pinout and 5-V fixed output; lower max current (2.5 A vs 3 A). | Suitable for lower-power loads (<2.5 A); shares same layout and feedback configuration but requires higher-current diode selection. | Select when 2.5-A output suffices and board space constraints favor reuse of LM2670 layout with minor component changes. |
| TPS54302DDAR | 3-A synchronous buck with integrated high- and low-side FETs; 4.5–28-V input; adjustable output; 2.5-V minimum input - no external diode required. | Enables smaller solution size and higher light-load efficiency due to synchronous rectification; lacks SYNC input and fixed 5-V option. | Choose for new designs prioritizing footprint reduction and efficiency below 1-A load, accepting added design complexity for adjustable output. |
Compared with LM2670SX-5.0, LM2671MX-5.0 offers identical functionality at reduced current rating and lower cost, while TPS54302DDAR replaces the external diode with synchronous rectification - improving light-load efficiency but requiring feedback resistor configuration and losing sync capability.
Availability
LM2670SX-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, battery charging systems, and communications equipment requiring stable component supply with long-term manufacturability and thermal reliability.
Supply support for LM2670SX-5.0 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, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.
The LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, high-efficiency DC/DC conversion with minimal external components and robust thermal performance in demanding environments.
FAQ
What is the maximum input voltage rating for LM2670SX-5.0?
The absolute maximum input voltage for LM2670SX-5.0 is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding safe operating area limits and may trigger internal protection or cause permanent damage. For automotive load-dump scenarios up to 40 V, the device remains functional within specification when used with proper input filtering and clamping per TI application guidelines.
Does LM2670SX-5.0 require an external diode, and why?
Yes, LM2670SX-5.0 requires an external Schottky diode because it integrates only a high-side DMOS switch - not a synchronous rectifier. The diode provides the return path for inductor current during the switch-off phase. This architecture simplifies gate drive design and improves robustness under reverse-voltage or short-circuit conditions compared to fully synchronous alternatives.
Can LM2670SX-5.0 be synchronized to an external clock, and what is the valid frequency range?
Yes, LM2670SX-5.0 supports external synchronization via its SYNC pin (Pin 5). The valid input clock frequency range is 280 kHz to 400 kHz - strictly higher than the internal oscillator's maximum of 280 kHz. Using SYNC enables precise ripple frequency control for EMI filtering and spectral management, especially critical in radio and communications applications where interference must be predictably positioned.
What is the thermal performance of LM2670SX-5.0 in the TO-263-7 package?
In the TO-263-7 (KTW) package, LM2670SX-5.0 achieves a junction-to-ambient thermal resistance (RθJA) of 26°C/W with 7.4× die-pad copper area and 12 vias to inner layers. At 3-A load and 12-V input, typical power dissipation is ~1.2 W - resulting in ~31°C junction rise above ambient. Proper PCB thermal design (exposed pad soldered to ≥1 in² copper) is essential to maintain operation within the –40°C to 125°C junction limit.
Is LM2670SX-5.0 pin-compatible with other versions in the LM2670 family?
Yes, all LM2670 variants - including LM2670SX-3.3, LM2670SX-5.0, LM2670SX-12, and LM2670SX-ADJ - share identical TO-263-7 pinout and package footprint. The only differences are internal feedback resistor ratios (for fixed outputs) or absence thereof (for adjustable version), allowing hardware reuse across output voltages with only BOM and layout minor adjustments.
LM2670SX-5.0 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2670SX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SX-5.0 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 reliable?
The price and inventory of LM2670SX-5.0 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 is usually 5 days.
3.What payment methods are accepted for LM2670SX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SX-5.0?
LM2670SX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SX-5.0 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?
For technical support, including LM2670SX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SX-5.0 requirements.
6.How does Aetrix verify that LM2670SX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2670SX-5.0 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 meets industry standards.
7.What is the process for return or replacement of LM2670SX-5.0?
All LM2670SX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SX-5.0, 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 part is unused and in its original packaging.
Return procedure for LM2670SX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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