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Texas Instruments LM2670T-5.0
- Part No.:
- LM2670T-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2670T-5.0.pdf
- Description:
- IC REG BUCK 5V 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:3,096
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Product details
Overview
LM2670T-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 over line/load/temperature, and 150-mΩ DMOS high-side switch. It delivers >90% efficiency in compact power supplies for industrial and communications equipment.
For engineers reviewing the LM2670T-5.0 datasheet, LM2670T-5.0 pinout, LM2670T-5.0 application, or LM2670T-5.0 equivalent, key selection criteria include its fixed 5-V output accuracy, thermal shutdown and current limiting protection, ON/OFF control with 50-µA standby, external sync capability (280–400 kHz), and TO-263-7 package suitability for high-current PCB layouts.
Technical Context
The LM2670T-5.0 implements a voltage-mode PWM controller with an integrated 150-mΩ DMOS high-side switch and internal 260-kHz oscillator. Its feedback loop uses a two-stage high-gain amplifier referenced to an internal 1.23-V bandgap, enabling precise regulation without external resistors for the fixed 5-V version.
It supports both self-oscillating operation and external synchronization via the SYNC pin (5), requiring input frequencies above 280 kHz. The device enters shutdown mode below 0.8 V on the ON/OFF pin (7), reducing quiescent current to 50 µA while retaining full thermal and current-limit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 5.0 V ±2% over –40°C to 125°C junction temperature, 8–40 V input, 100 mA–5 A load - ensures stable rail for microcontrollers and logic without external divider. |
| Input voltage range | 8 V to 40 V - supports wide-range industrial inputs including 12-V, 24-V, and 36-V nominal systems. |
| Switching frequency | 260 kHz fixed internal oscillator (±15%) - enables predictable EMI profile and simplifies filter design with standard off-the-shelf inductors. |
| Max output current | 3 A continuous - sufficient for powering FPGA I/O banks, DSP cores, or multi-rail subsystems without external current boosting. |
| Efficiency | Up to 88% at VIN = 12 V, IOUT = 5 A - minimizes thermal stress and eliminates need for heatsinks in moderate-power applications. |
| Quiescent current | 50 µA in shutdown (ON/OFF = 0 V) - enables low-power system sleep modes without battery drain. |
| RDS(ON) | 0.15 Ω typical - reduces conduction loss and improves thermal performance at full load. |
| Thermal shutdown | Integrated protection activates above 160°C junction - prevents catastrophic failure during overload or poor heatsinking. |
Pinout & Package
LM2670T-5.0 is packaged in TO-263-7 (KTW), a thermally enhanced surface-mount variant of the DDPAK with exposed thermal pad. The 10.10 mm × 8.89 mm body enables high-current PCB routing and efficient heat transfer to copper planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal DMOS FET; connects directly to inductor and Schottky diode cathode - must be routed with minimal loop area to reduce EMI. |
| 2 (VIN) | Input supply | Main power input (8–40 V); requires low-ESR ceramic capacitor placed <2 mm from pin - forms critical high-frequency return path. |
| 3 (CBOOST) | Bootstrap capacitor connection | Connects 100-nF ceramic capacitor to SW pin; provides gate drive voltage >VIN to fully enhance internal high-side FET - essential for low RDS(ON). |
| 4 (GND) | Power ground | Primary ground reference for internal circuitry, CIN, and COUT; must tie to large copper pour - serves as return for high di/dt switching currents. |
| 5 (SYNC) | External sync input | Accepts TTL/CMOS clock (280–400 kHz); overrides internal oscillator - used to align ripple frequency across multiple rails or avoid sensitive bands. |
| 6 (FB) | Feedback input | Internally connected to 5-V output divider; shorted directly to VOUT - no external resistors needed, eliminating calibration drift and layout sensitivity. |
| 7 (ON/OFF) | Enable control | Active-high logic input (1.4 V threshold); pulls up internally ~20 µA - allows direct MCU GPIO control or simple pull-up resistor for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology | Eliminates external freewheeling diode, reducing conduction loss and improving efficiency by 3–5% vs. asynchronous designs. |
| Integrated 150-mΩ DMOS switch | Enables 3-A output in TO-263 without external MOSFETs or complex gate drivers - cuts BOM count and layout complexity. |
| ±2% output tolerance | Guaranteed across full temperature, line, and load range - meets tight regulation requirements for digital ICs without post-regulation LDOs. |
| External sync capability | Allows precise ripple frequency positioning for EMI compliance and multi-rail coherence - critical in radio transceivers and data converters. |
| 50-µA shutdown current | Supports ultra-low-power system states (e.g., battery backup, deep sleep) without compromising fast wake-up (<100 µs). |
| Built-in protection suite | Includes thermal shutdown, cycle-by-cycle current limiting, and undervoltage lockout - removes need for discrete fault management circuitry. |
Applications
| Industrial PLC Power Supply | Communications Radio Preregulator |
|---|---|
|
Use Scenario: Provides clean 5-V rail for ARM Cortex-M7 microcontroller, CAN transceiver, and analog front-end in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24-V DC bus to isolated 5-V logic supply; operates at fixed 260-kHz frequency to simplify EMI filtering. Use Value: Delivers 3-A peak current with <1% load transient deviation, enabling reliable real-time I/O scanning without brownouts under motor switching noise. |
Use Scenario: Generates stable 5-V supply for RF power amplifier bias and ADC/DAC reference in portable SDR transceivers. IC Role / Device Role / Timing Role: Pre-regulator stage ahead of low-noise LDOs; synchronized to main system clock (300 kHz) to prevent beat frequencies in IF chain. Use Value: External sync capability locks ripple spectrum away from 2.4-GHz ISM band, reducing conducted emissions by 12 dBµV per CISPR-22 testing. |
| Battery Charger Management Board | Automotive Infotainment Core Supply |
|
Use Scenario: Powers charging controller IC and USB-PD interface in 12-V automotive battery charger with 5-V auxiliary rail. IC Role / Device Role / Timing Role: High-efficiency buck converter stepping down alternator-supplied 13.8–16 V to regulated 5 V; uses ON/OFF pin for charge-state sequencing. Use Value: 88% efficiency at 12-V input minimizes thermal rise in sealed enclosure; 50-µA shutdown extends battery runtime during storage mode. |
Use Scenario: Supplies 5-V core voltage to audio DSP and display timing controller in vehicle head unit with 12-V battery input. IC Role / Device Role / Timing Role: Main DC/DC regulator operating across cold-crank (6 V) to load-dump (40 V) conditions; leverages wide 8–40 V input range. Use Value: Integrated thermal shutdown and current limit protect against sustained overloads during display backlight surges, meeting AEC-Q100 stress test requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-5.0 | Lower 3-A peak current rating, no SYNC pin, 150-kHz oscillator, higher RDS(ON) (0.22 Ω) | Lacks external sync and has reduced efficiency (≤85%) - suitable only where EMI alignment is not required and thermal margin is ample. | Select LM2596T-5.0 only if cost is primary constraint and 260-kHz ripple frequency is acceptable. |
| TPS54302DDAR | Higher 3-A continuous rating, 2.5-V to 28-V input, 2.2-MHz switching, integrated soft-start, but no thermal pad in SOIC-8 | Requires smaller magnetics but lacks TO-263 thermal performance - better for space-constrained boards with forced air cooling. | Choose TPS54302DDAR when board area is limited and high-frequency operation justifies added layout complexity. |
Compared with LM2596T-5.0 and TPS54302DDAR, the LM2670T-5.0 uniquely balances 3-A capability, TO-263 thermal robustness, fixed-frequency predictability, and external sync - making it optimal for industrial and communications systems demanding reliability over miniaturization.
Availability
LM2670T-5.0 is available at Aetrix Electronics and suitable for industrial automation, communications infrastructure, and battery-powered equipment requiring stable component supply, long-term lifecycle support, and consistent thermal performance across ambient temperatures.
Supply support for LM2670T-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 leader specializing in analog and embedded processing technologies, with decades of expertise in power management ICs and high-reliability industrial solutions.
The LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for engineers needing fast, robust, and easy-to-implement DC/DC conversion - emphasizing minimal external components, wide input range, and built-in protection for harsh environments.
FAQ
What is the maximum input voltage rating for LM2670T-5.0?
The absolute maximum input voltage for LM2670T-5.0 is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding internal voltage ratings and may trigger overvoltage protection or cause permanent damage. For automotive cold-crank scenarios, the 8-V minimum ensures startup even at battery voltages as low as 6.5 V after derating.
Does LM2670T-5.0 require external feedback resistors?
No, LM2670T-5.0 does not require external feedback resistors. As a fixed-output variant, it contains internal precision resistor dividers calibrated for 5.0 V ±2%. Pin 6 (FB) must be connected directly to the output capacitor's positive terminal - adding external resistors would disrupt regulation and void output accuracy guarantees.
Can LM2670T-5.0 synchronize to an external clock?
Yes, LM2670T-5.0 supports external synchronization via Pin 5 (SYNC). An externally applied TTL- or CMOS-compatible clock signal between 280 kHz and 400 kHz will override the internal 260-kHz oscillator. This feature enables EMI spectrum control and multi-rail phase alignment - but disables current-limit foldback during sync operation.
What thermal performance can be expected from LM2670T-5.0 in TO-263-7 package?
In the TO-263-7 (KTW) package, LM2670T-5.0 achieves a junction-to-ambient thermal resistance (RθJA) of 26°C/W with 0.4896 in² copper pour and 1 oz. copper thickness. At 3-A load and 12-V input, this yields ~25°C junction rise above ambient - well within the –40°C to 125°C operating range without forced airflow or heatsinks.
How does the ON/OFF pin function on LM2670T-5.0?
The ON/OFF pin (Pin 7) is an active-high enable input with 1.4-V threshold. Pulling it below 0.8 V places LM2670T-5.0 in shutdown mode, reducing quiescent current to 50 µA. The pin features an internal 20-µA pull-up and 7-V Zener clamp. Leaving it open-circuited enables the device; driving it with a microcontroller GPIO provides precise power sequencing control.
LM2670T-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2670T-5.0 FAQ
1.How can I place an order for LM2670T-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670T-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 LM2670T-5.0 reliable?
The price and inventory of LM2670T-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 LM2670T-5.0 is usually 5 days.
3.What payment methods are accepted for LM2670T-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670T-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670T-5.0?
LM2670T-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670T-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 LM2670T-5.0?
For technical support, including LM2670T-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670T-5.0 requirements.
6.How does Aetrix verify that LM2670T-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2670T-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 LM2670T-5.0 meets industry standards.
7.What is the process for return or replacement of LM2670T-5.0?
All LM2670T-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2670T-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 LM2670T-5.0 part is unused and in its original packaging.
Return procedure for LM2670T-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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