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Texas Instruments LM2678T-ADJ/S7002204
- Part No.:
- LM2678T-ADJ/S7002204
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2678T-ADJ/S7002204.pdf
- Description:
- IC REG BUCK ADJ 5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,208
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Product details
Overview
LM2678T-ADJ/S7002204 from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 5A output current with adjustable output voltage (1.2V–37V), 260kHz fixed-frequency operation, 120mΩ internal DMOS switch, and ±2% output voltage tolerance over full line/load/temperature range. It serves as a high-efficiency (>90%) primary power conversion stage in industrial power supplies and battery-based systems.
For engineers reviewing the LM2678T-ADJ/S7002204 datasheet, LM2678T-ADJ/S7002204 pinout, LM2678T-ADJ/S7002204 application, or LM2678T-ADJ/S7002204 equivalent, key selection criteria include input voltage range (8V–40V), thermal performance in TO-263 package, feedback bias current (85nA), ON/OFF threshold (0.8V–2V), and standby quiescent current (50μA).
Technical Context
The LM2678T-ADJ/S7002204 implements a fixed-frequency (260kHz ±11%) PWM controller driving an integrated high-side DMOS FET with 120mΩ RDS(ON) at 25°C. Its feedback loop uses a two-stage high-gain amplifier referenced to a precise 1.21V internal reference (±1.15% over temperature), enabling stable regulation across 1.2V–37V via external resistor divider.
Functional modes include active regulation (ON/OFF ≥1.4V) and shutdown (ON/OFF ≤0.8V), drawing only 50μA standby current. Thermal protection, cycle-by-cycle current limiting (6.1A–8.75A), and built-in soft-start ensure robust operation in demanding environments from –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous - supports high-power loads without external current boosting |
| Input Voltage Range | 8V to 40V - compatible with 12V/24V industrial rails and wide-range battery inputs |
| Output Voltage Range | 1.2V to 37V adjustable - enables flexible system-level voltage scaling via FB divider |
| Switch RDS(ON) | 0.12Ω typical at 25°C - minimizes conduction loss for >90% efficiency at full load |
| Oscillator Frequency | 260kHz ±11% - enables use of compact off-the-shelf inductors and reduces EMI fundamental |
| Feedback Reference | 1.21V ±1.15% - ensures ±2% output tolerance across temperature and line/load conditions |
| Standby Quiescent Current | 50μA - allows low-power system sleep modes without auxiliary LDOs |
Pinout & Package
LM2678T-ADJ/S7002204 is packaged in KTW (TO-263-7), a thermally enhanced surface-mount variant of TO-220 with exposed DAP for PCB heat sinking. The 7-pin layout supports high-current routing and simplified thermal management in space-constrained industrial designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Output | High-side DMOS drain node - connects directly to inductor and Schottky cathode; switches between VIN and ~–0.5V |
| 2 (VIN) | Input Supply | Main power input (8V–40V); requires low-ESR bypass capacitor placed adjacent to pin |
| 3 (CB) | Bootstrap Capacitor | Connects to SW via 100nF ceramic capacitor - provides gate drive voltage >VIN for full FET enhancement |
| 4 (GND) | Power Ground | Primary return path for input/output capacitors and thermal DAP - must tie to large copper area |
| 5 (NC) | No Connect | Internally unconnected - leave floating; no routing or soldering required |
| 6 (FB) | Feedback Input | Senses output voltage via resistor divider - sets VOUT = 1.21V × (1 + R1/R2); bias current 85nA |
| 7 (ON/OFF) | Enable Control | Logic-level shutdown input - <0.8V disables regulator (50μA ISTBY); >1.4V enables operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 120mΩ DMOS Switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity for 5A buck converters |
| Fixed 260kHz Oscillator | Enables predictable EMI filtering and consistent inductor sizing across designs without frequency drift |
| ±2% Output Tolerance | Guarantees tight regulation without post-production trimming, critical for sensitive analog or digital loads |
| Thermal Shutdown & Current Limit | Protects against overload and ambient overheating without external sensing circuitry |
| ON/OFF Pin with 50μA Standby | Supports system-level power sequencing and ultra-low-power sleep states in battery-powered equipment |
Applications
| Industrial Power Supply | Battery-Based Equipment |
|---|---|
Use Scenario: Primary 24V-to-5V/3.3V conversion in programmable logic controllers (PLCs) with wide input transients. IC Role / Device Role / Timing Role: High-current buck regulator providing stable core voltage for microcontrollers and I/O drivers. Use Value: 92% efficiency at 5A reduces thermal load on sealed enclosures; 8V–40V input handles brownouts and surges per IEC 61000-4-5. | Use Scenario: Rechargeable 24V lithium-ion pack powering portable test instrumentation with variable load profiles. IC Role / Device Role / Timing Role: Adjustable-output preregulator stepping down battery voltage to intermediate rail before LDOs. Use Value: 1.2V–37V adjustability accommodates aging battery voltage swing; 50μA shutdown extends runtime during idle periods. |
| Embedded System Preregulator | Efficient AC/DC Auxiliary Supply |
Use Scenario: Pre-regulating 12V from wall adapter to feed low-noise linear regulators for ADCs and sensors. IC Role / Device Role / Timing Role: High-efficiency step-down stage minimizing heat before precision analog stages. Use Value: >90% efficiency avoids thermal coupling into signal chains; ±2% output tolerance maintains ADC reference stability. | Use Scenario: Secondary-side 48V-to-12V conversion in telecom power shelves where size and thermal density are constrained. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter replacing discrete solutions in high-density modules. Use Value: TO-263 package with DAP enables 26°C/W thermal resistance with 1.0 in² copper; simplifies heatsink integration. |
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-ADJ | 3A output current, 150kHz switching frequency, higher RDS(ON) (0.22Ω), wider VIN (4.5V–40V) | Limited to lower-power loads; slower switching increases inductor size and reduces light-load efficiency | Select when cost sensitivity outweighs current capability and thermal constraints |
| TPS54560B | 5.5A output, 100kHz–2.5MHz adjustable frequency, integrated compensation, 3.5V–60V input | Requires external compensation tuning; supports synchronous rectification for higher efficiency | Choose for designs needing programmable frequency, wider input range, or tighter transient response |
Compared with LM2678T-ADJ/S7002204, LM2596T-ADJ offers lower cost but sacrifices 40% output current and thermal performance, while TPS54560B delivers greater flexibility and efficiency at the expense of design complexity and bill-of-materials count.
Availability
LM2678T-ADJ/S7002204 is available at Aetrix Electronics and suitable for industrial power supplies, battery-based equipment, embedded system preregulators, and efficient AC/DC auxiliary supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2678T-ADJ/S7002204 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 LM2678 series belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and robust performance in industrial, automotive, and telecom power applications.
FAQ
What is the maximum output current rating of the LM2678T-ADJ/S7002204?
The LM2678T-ADJ/S7002204 is rated for continuous output current up to 5A under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Current limit is specified from 5.75A to 8.75A across temperature, ensuring safe operation during transient overloads without external current-sense components.
Does the LM2678T-ADJ/S7002204 require an external bootstrap capacitor?
Yes, the LM2678T-ADJ/S7002204 requires a 100nF ceramic capacitor connected between the CB pin and the SW pin to provide sufficient gate drive voltage for the internal high-side DMOS switch. This bootstrap configuration ensures full enhancement of the FET and maintains low RDS(ON) across the full input voltage range.
What is the feedback reference voltage for the LM2678T-ADJ/S7002204?
The LM2678T-ADJ/S7002204 uses an internal 1.21V reference voltage at the FB pin, with ±1.15% tolerance over temperature. This reference determines output voltage via VOUT = 1.21V × (1 + R1/R2), enabling precise adjustment from 1.2V to 37V using standard resistor values.
Can the LM2678T-ADJ/S7002204 operate with an input voltage below 8V?
No-the absolute minimum recommended input voltage for reliable operation of the LM2678T-ADJ/S7002204 is 8V. Operation below this level may prevent proper gate drive of the internal DMOS switch and result in regulation failure or excessive dropout. The device's absolute maximum input rating is 45V, with recommended operation bounded by 8V–40V.
How does the ON/OFF pin function on the LM2678T-ADJ/S7002204?
The ON/OFF pin of the LM2678T-ADJ/S7002204 provides logic-level enable control: pulling it below 0.8V places the device in shutdown mode with 50μA standby current, while driving it above 1.4V enables normal regulation. An internal 20μA pull-up current source allows simple operation by leaving the pin open for always-on functionality.
LM2678T-ADJ/S7002204 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 5A
- 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
LM2678T-ADJ/S7002204 FAQ
1.How can I place an order for LM2678T-ADJ/S7002204 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2678T-ADJ/S7002204 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 LM2678T-ADJ/S7002204 reliable?
The price and inventory of LM2678T-ADJ/S7002204 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2678T-ADJ/S7002204 is usually 5 days.
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Once your LM2678T-ADJ/S7002204 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 LM2678T-ADJ/S7002204?
For technical support, including LM2678T-ADJ/S7002204 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2678T-ADJ/S7002204 requirements.
6.How does Aetrix verify that LM2678T-ADJ/S7002204 is sourced from the original manufacturer or authorized distributors?
All LM2678T-ADJ/S7002204 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 LM2678T-ADJ/S7002204 meets industry standards.
7.What is the process for return or replacement of LM2678T-ADJ/S7002204?
All LM2678T-ADJ/S7002204 units undergo pre-shipment inspection (PSI). If there is an issue with LM2678T-ADJ/S7002204, 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 LM2678T-ADJ/S7002204 part is unused and in its original packaging.
Return procedure for LM2678T-ADJ/S7002204:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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