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Texas Instruments LM2670SD-5.0
- Part No.:
- LM2670SD-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2670SD-5.0.pdf
- Description:
- IC REG BUCK 5V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,215
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Product details
Overview
LM2670SD-5.0 from Texas Instruments is a monolithic 3-A synchronous step-down (buck) DC/DC voltage regulator with fixed 5-V output, 8–40 V input range, 260-kHz internal oscillator, ±2% output tolerance, and 50-µA standby current. It integrates a 150-mΩ DMOS high-side switch and supports external clock synchronization for ripple frequency control in communications power supplies.
For engineers reviewing the LM2670SD-5.0 datasheet, LM2670SD-5.0 pinout, LM2670SD-5.0 application, or LM2670SD-5.0 equivalent, key selection criteria include its fixed 5-V output accuracy, thermal shutdown protection, ON/OFF enable functionality, sync-capable switching architecture, and TO-263-7 (KTW) package suitability for high-current industrial and telecom power rails.
Technical Context
The LM2670SD-5.0 implements a voltage-mode PWM controller with an internal 260-kHz oscillator and supports external synchronization from 280 kHz to 400 kHz via the SYNC pin. Its integrated 150-mΩ DMOS high-side switch enables up to 3-A continuous output current with efficiency up to 94% at optimal load points.
It operates across –40°C to +125°C junction temperature, features built-in thermal shutdown and current limiting, and uses a dedicated CBOOST capacitor to drive the high-side FET gate above VIN-ensuring low conduction loss and stable regulation under wide line/load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 5.0 V ±2% over full line, load, and temperature (–40°C to 125°C) |
| Input voltage range | 8 V to 40 V - supports wide industrial and automotive battery-derived rails |
| Max output current | 3 A continuous - sufficient for FPGA core logic, DSPs, and multi-rail subsystems |
| Switching frequency | 260 kHz fixed internal oscillator; externally synchronizable from 280–400 kHz for EMI control |
| Quiescent current | 50 µA in shutdown mode - enables ultra-low-power standby in always-on systems |
| ON-resistance (RDS(ON)) | 150 mΩ typical - minimizes conduction loss and thermal rise at 3-A load |
| Thermal shutdown | Integrated protection activates at ~165°C junction - prevents damage during overload or poor heatsinking |
Pinout & Package
LM2670SD-5.0 is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad for enhanced heat dissipation. Dimensions are 10.10 mm × 8.89 mm, and the thermal pad must be soldered to PCB copper for reliable thermal performance.
| 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 - critical high-dV/dt node requiring short layout |
| 2 (VIN) | Input supply | Main power input (8–40 V); requires low-ESR bypass capacitor placed adjacent to pin - path to GND must be minimal inductance |
| 3 (CBOOST) | Bootstrap capacitor | Connects 100-nF ceramic capacitor to SW pin; provides 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 tie to large copper plane for noise immunity and thermal relief |
| 5 (SYNC) | Synchronization input | Accepts TTL/CMOS clock (280–400 kHz); overrides internal oscillator to fix ripple frequency - essential for EMI-sensitive radio equipment |
| 6 (FB) | Feedback input | Internally connected to 5-V output divider; no external resistors needed - simplifies layout and eliminates feedback drift sources |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4 V = active, ≤0.8 V = shutdown; internal 20-µA pull-up allows floating for default ON operation |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output with ±2% tolerance | Eliminates external feedback resistor network - improves long-term stability and reduces BOM count |
| 150-mΩ integrated DMOS high-side switch | Reduces conduction loss and thermal stress at 3-A load - enables compact thermal design without external MOSFETs |
| External clock synchronization (280–400 kHz) | Enables precise ripple frequency placement - critical for meeting CISPR-22 conducted EMI limits in comms equipment |
| 50-µA shutdown quiescent current | Supports energy-sensitive applications like battery-backed monitoring nodes - extends runtime during idle periods |
| Thermal shutdown + current limit protection | Provides autonomous fault recovery without external circuitry - enhances reliability in unattended industrial deployments |
Applications
| Industrial Motor Control Power Supply | Telecom Line Card Pre-regulator |
|---|---|
|
Use Scenario: Provides clean 5-V rail for microcontrollers, gate drivers, and isolated I/O in PLC modules operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5-V output with tight tolerance and fast transient response to handle motor startup surges. Use Value: ±2% output accuracy ensures reliable MCU boot and sensor interface operation; 3-A capability supports concurrent logic and analog circuitry without derating. |
Use Scenario: Generates stable 5-V intermediate rail from 48-V telecom backplane for downstream DC/DC converters and PHY ICs. IC Role / Device Role / Timing Role: High-efficiency preregulator enabling lower-loss final-stage conversion; synchronized switching avoids beat frequencies with other system clocks. Use Value: 94% peak efficiency at 24-V input reduces heat generation in dense line cards; SYNC pin allows co-location with system master clock for predictable EMI spectrum. |
| Battery-Powered Test Equipment | Automotive Infotainment Core Supply |
|
Use Scenario: Powers ARM-based data acquisition unit from 12-V sealed lead-acid battery with extended runtime requirements. IC Role / Device Role / Timing Role: Main system regulator with ON/OFF control tied to host MCU - enters 50-µA standby when instrument is idle. Use Value: Ultra-low shutdown current extends battery life between calibrations; wide 8–40 V input accommodates battery voltage sag and jump-start transients. |
Use Scenario: Supplies 5-V rail to audio DSP, display controller, and USB hub in head-unit design operating from vehicle 12-V battery. IC Role / Device Role / Timing Role: Robust primary converter handling cold-crank (6-V) and load-dump (40-V) events per ISO 7637-2. Use Value: 40-V absolute max input rating and thermal shutdown protect against automotive transients; TO-263 package offers mechanical reliability in high-vibration environments. |
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-5.0 | Same pinout and function but rated for 2.5-A max output; lower current limit (4.2 A vs 5.25 A) and higher RDS(ON) (180 mΩ) | Suitable for lower-power infotainment modules or sensor hubs where 3-A headroom is unnecessary | Select when cost sensitivity outweighs need for 3-A margin and thermal headroom is constrained |
| TPS54302DDCR | 3-A synchronous buck with 4.5–28-V input, 5-V fixed output, 2-MHz switching, and integrated compensation - no external sync capability | Better suited for space-constrained designs needing high-frequency operation and smaller magnetics | Choose for compact PCB layouts where 2-MHz operation enables <10-µH inductors - but avoid if EMI-controlled sync is required |
Compared with LM2671SD-5.0, the LM2670SD-5.0 delivers higher current capability and lower conduction loss; versus TPS54302DDCR, it trades higher-frequency integration for precise external sync control and wider input range - making it preferable for industrial and telecom systems demanding robustness and EMI predictability.
Availability
LM2670SD-5.0 is available at Aetrix Electronics and suitable for industrial motor control, telecom line card power, battery-powered test equipment, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM2670SD-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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in non-isolated DC/DC buck conversion, emphasizing minimal external components, robust protection, and broad operating conditions.
FAQ
What is the maximum input voltage rating for LM2670SD-5.0?
The LM2670SD-5.0 has an absolute maximum input voltage rating of 45 V, with recommended operation from 8 V to 40 V. This wide range supports applications such as 24-V industrial buses and 48-V telecom systems with transient margins. Exceeding 40 V continuously may reduce reliability, and operation below 8 V prevents proper regulation due to minimum duty cycle constraints.
Does LM2670SD-5.0 require external feedback resistors?
No, LM2670SD-5.0 does not require external feedback resistors. As a fixed 5-V output variant, it contains internal precision resistor dividers connected to the FB pin. The FB pin is internally tied to the output, eliminating external components and associated drift or noise coupling - simplifying layout and improving long-term output stability.
How does the SYNC pin function on LM2670SD-5.0?
The SYNC pin on LM2670SD-5.0 accepts an external TTL/CMOS clock signal (280–400 kHz) to override the internal 260-kHz oscillator. When driven, it forces exact switching frequency alignment - enabling consistent output ripple positioning for EMI filtering and avoiding beat frequencies in multi-rail systems. Sync operation disables frequency foldback during overcurrent events.
What thermal considerations apply to LM2670SD-5.0 in TO-263 package?
In the TO-263-7 (KTW) package, LM2670SD-5.0 achieves a junction-to-ambient thermal resistance of 26°C/W with 0.4896 in² copper area and 1 oz copper. Effective thermal design requires soldering the exposed thermal pad to a minimum 100 mm² copper pour with ≥4 thermal vias to inner ground planes. Without this, junction temperature can exceed 125°C at full 3-A load and 40-V input.
Can LM2670SD-5.0 operate in discontinuous conduction mode (DCM)?
Yes, LM2670SD-5.0 automatically transitions into discontinuous conduction mode at light loads (<300 mA typical), reducing switching losses and maintaining regulation. DCM behavior is inherent to its voltage-mode PWM architecture and does not require configuration. Output ripple increases slightly in DCM, but regulation remains within ±2% across the full 100-mA to 3-A load range.
LM2670SD-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- 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:
- 14-VSON (5x6)
LM2670SD-5.0 FAQ
1.How can I place an order for LM2670SD-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SD-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 LM2670SD-5.0 reliable?
The price and inventory of LM2670SD-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 LM2670SD-5.0 is usually 5 days.
3.What payment methods are accepted for LM2670SD-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SD-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SD-5.0?
LM2670SD-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SD-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 LM2670SD-5.0?
For technical support, including LM2670SD-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SD-5.0 requirements.
6.How does Aetrix verify that LM2670SD-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2670SD-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 LM2670SD-5.0 meets industry standards.
7.What is the process for return or replacement of LM2670SD-5.0?
All LM2670SD-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SD-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 LM2670SD-5.0 part is unused and in its original packaging.
Return procedure for LM2670SD-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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