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Texas Instruments LM2676S-ADJ
- Part No.:
- LM2676S-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2676S-ADJ.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,126
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Product details
Overview
LM2676S-ADJ from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3A output current with adjustable output voltage (1.2V to 37V), 260kHz fixed-frequency operation, ±2% output voltage tolerance over line/load/temperature, and 8V–40V input range. It integrates a 150mΩ DMOS high-side switch and supports thermal shutdown, current limiting, and ON/OFF control - used in industrial power supplies requiring stable, high-efficiency conversion.
For engineers reviewing the LM2676S-ADJ datasheet, LM2676S-ADJ pinout, LM2676S-ADJ application, or LM2676S-ADJ equivalent, key selection criteria include its 3A continuous output capability, 260kHz oscillator tolerance (±11%), feedback reference voltage (1.21V typ), standby current (50µA), and compatibility with standard off-the-shelf inductors and Schottky diodes in TO-263-7 or TO-220-7 packages.
Technical Context
The LM2676S-ADJ implements a fixed-frequency PWM controller with internal 260kHz oscillator driving a high-side N-channel DMOS switch. Its feedback loop uses a precision 1.21V reference and low-bias-current (85nA) error amplifier to regulate output via external resistor divider on the FB pin.
It operates in continuous conduction mode (CCM) across full load range, features built-in cycle-by-cycle current limiting (typ. 4.5A), thermal shutdown, and a dedicated ON/OFF pin with 1.4V threshold and 20µA input current - enabling controlled startup/shutdown without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports industrial loads like motor drivers and metering circuits without external current boosting. |
| Input Voltage Range | 8V to 40V - compatible with 12V/24V industrial rails and wide-range unregulated supplies. |
| Output Voltage Range | 1.2V to 37V (adjustable) - set via external resistor divider; enables flexible system-level rail generation. |
| Feedback Reference | 1.21V ±2.3% - defines output accuracy; determines VOUT = 1.21V × (1 + R1/R2) with minimal bias current error. |
| Switching Frequency | 260kHz ±11% - enables use of compact magnetics while maintaining EMI manageability in embedded systems. |
| Efficiency | Up to 94% - achieved via 150mΩ DMOS switch and optimized gate drive; reduces thermal load in enclosed enclosures. |
| Standby Current | 50µA - allows low-power sleep modes in battery-backed or energy-conscious applications. |
| Thermal Shutdown | Active at TJ ≥ 160°C - protects device during overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
LM2676S-ADJ is available in KTW (TO-263-7) and NDZ (TO-220-7) packages - both thermally enhanced 7-pin variants with exposed thermal pads. The KTW package measures 10.1mm × 15.24mm; NDZ is 10.16mm × 8.13mm. Pin functions are identical across both packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Switch_output | High-side switch drain | Switching node connected to inductor and Schottky diode cathode; carries high dv/dt and peak currents - requires tight layout and ground plane. |
| 2: Input | Main power input | Connects to 8–40V supply and input capacitor; path to GND must be shortest possible to minimize ringing and EMI. |
| 3: CB | Bootstrap capacitor terminal | Connects 100nF ceramic capacitor to Switch_output; enables full enhancement of internal MOSFET gate for low RDS(ON). |
| 4: GND | Power ground | Primary return for input/output capacitors and thermal pad; must be tied directly to large copper area for thermal and noise control. |
| 5: NC | No-connect | Internally unused; leave unconnected and un-routed on PCB. |
| 6: FB | Feedback sense input | High-impedance (85nA bias) input monitoring output voltage divider; sensitive to noise - route away from Switch_output and inductor. |
| 7: ON/OFF | Enable control input | Logic-level enable: >1.4V = active, <0.8V = shutdown; internal 20µA pull-up allows simple open-drain control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Enables 3A output without external FET; eliminates gate driver complexity and reduces BOM count. |
| Fixed 260kHz oscillator | Allows predictable EMI profile and simplifies filter design; avoids frequency jitter issues seen in variable-frequency regulators. |
| ±2% output tolerance | Guaranteed across –40°C to 125°C junction temperature, full line/load - meets tight regulation needs in metrology and instrumentation. |
| 50µA standby quiescent current | Supports ultra-low-power system states; enables >1-year battery life in maintenance-free remote sensors when paired with low-IQ peripherals. |
| Internal thermal shutdown & current limit | Protects against sustained overload or ambient overheating without external sensing circuitry - improves field reliability. |
| WEBENCH® Power Designer support | Provides validated component selection, efficiency simulation, BOM export, and schematic generation - reduces design cycle from days to hours. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and isolated RS-485 interface in cellular or LoRaWAN communication modules operating from 12–36V DC rails. IC Role / Device Role / Timing Role: Primary buck converter generating 3.3V or 5V system rail; regulates under dynamic load transients caused by burst transmission. Use Value: 3A capability handles peak transmit current; 260kHz switching enables small 33µH inductor; ±2% tolerance ensures ADC reference stability in signal chain. | Use Scenario: Supplies microcontroller, real-time clock, LCD driver, and isolation barrier in Class 0.2 electricity meters with 24V auxiliary input. IC Role / Device Role / Timing Role: Main isolated secondary-side regulator delivering 5V/3.3V from flyback-derived 12V bus; maintains regulation during AC line dips and surges. Use Value: Wide 8–40V input accommodates brownout conditions; thermal shutdown prevents failure during enclosure overheating; 50µA standby extends battery backup runtime. |
| Calling Button Panel | Motor Drive Auxiliary Supply |
Use Scenario: Powers LED indicators, tactile switch debouncing logic, and wireless BLE SoC in building access panels powered from 24V PoE or wall adapter. IC Role / Device Role / Timing Role: Compact, cost-optimized buck regulator generating 3.3V for digital logic; operates continuously with intermittent BLE wakeups. Use Value: TO-220-7 package enables easy heatsinking on metal panel; 94% efficiency minimizes heat buildup behind plastic housing; ON/OFF pin synchronizes with BLE sleep cycles. | Use Scenario: Generates 15V gate drive and 5V logic supply for half-bridge IGBTs in 24V DC brushless motor controllers used in HVAC actuators. IC Role / Device Role / Timing Role: Dual-rail auxiliary power source; delivers clean, regulated outputs independent of main motor bus ripple. Use Value: Adjustable output allows precise 15V gate drive setting; 150mΩ switch sustains 3A pulsed loads during motor commutation; CB pin ensures robust high-side drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ | Lower 1.5A output current; 150kHz switching; higher RDS(ON) (~300mΩ); no integrated thermal shutdown. | Suitable only for sub-1.5A loads; less efficient at high current; requires external thermal protection. | Select LM2596S-ADJ only if cost is primary constraint and load current remains ≤1.2A with ample margin. |
| TPS54302DDAR | 3A synchronous buck; 2.5–6V input; 300kHz–2.2MHz programmable frequency; 12µA IQ; smaller 8-pin SOIC package. | Requires lower input voltage; lacks 40V absolute max rating; better suited for battery-powered or low-vin systems. | Choose TPS54302DDAR for space-constrained, low-input designs where efficiency at light load matters more than high-vin resilience. |
Compared with LM2596S-ADJ, LM2676S-ADJ delivers 100% higher current and superior thermal safety; versus TPS54302DDAR, it trades smaller footprint and lower IQ for 8–40V operation and ruggedized industrial packaging - making LM2676S-ADJ optimal for mains-connected or wide-input industrial converters.
Availability
LM2676S-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, smart metering systems, and motor control auxiliary rails requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM2676S-ADJ 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 - serving industrial, automotive, and communications markets with high-reliability components.
The LM2676 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for ease-of-use in non-isolated DC-DC buck applications where high efficiency, minimal external components, and robust thermal performance are critical.
FAQ
What is the maximum output voltage achievable with LM2676S-ADJ?
The LM2676S-ADJ supports an adjustable output voltage range of 1.2V to 37V, determined by the external resistor divider on the FB pin. The upper limit is constrained by the 40V absolute maximum input rating and internal reference accuracy - achieving 37V requires careful selection of resistors with low tempco and tight tolerance to maintain ±2% regulation across temperature and load.
Does LM2676S-ADJ require an external Schottky diode?
Yes, LM2676S-ADJ requires an external Schottky diode connected between the Switch_output (pin 1) and GND. This diode provides the freewheeling path for inductor current during the switch OFF period. TI recommends diodes with ≤0.5V forward voltage and sufficient current rating (≥3A avg, ≥6A peak) - such as the SB560 or MBRB360 - to maintain high efficiency and thermal stability.
What is the purpose of the CB pin on LM2676S-ADJ?
The CB (bootstrap capacitor) pin on LM2676S-ADJ connects a 100nF ceramic capacitor to the Switch_output pin. This forms a charge pump that elevates the gate drive voltage above VIN, ensuring full enhancement of the internal high-side DMOS switch and minimizing conduction losses - directly enabling the 150mΩ RDS(ON) and >90% efficiency performance.
Can LM2676S-ADJ operate with input voltage below 8V?
No, LM2676S-ADJ has a minimum recommended input voltage of 8V per TI's datasheet. Operation below this level may result in insufficient gate drive for the internal DMOS switch, leading to erratic regulation, increased RDS(ON), thermal runaway, or failure to start. For sub-8V applications, consider alternatives like the TPS54302 or LM2596 with appropriate input range.
How does the ON/OFF pin function on LM2676S-ADJ?
The ON/OFF pin (pin 7) enables logic-level control of LM2676S-ADJ: pulling it below 0.8V places the device in shutdown mode with 50µA standby current; applying >1.4V activates regulation. An internal 20µA pull-up allows direct connection to MCU GPIO (open-drain or push-pull), eliminating need for external bias - supporting sequenced power-up and energy-saving sleep modes in embedded systems.
LM2676S-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 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)
LM2676S-ADJ FAQ
1.How can I place an order for LM2676S-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676S-ADJ 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 LM2676S-ADJ reliable?
The price and inventory of LM2676S-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2676S-ADJ is usually 5 days.
3.What payment methods are accepted for LM2676S-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676S-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676S-ADJ?
LM2676S-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676S-ADJ 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 LM2676S-ADJ?
For technical support, including LM2676S-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676S-ADJ requirements.
6.How does Aetrix verify that LM2676S-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2676S-ADJ 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 LM2676S-ADJ meets industry standards.
7.What is the process for return or replacement of LM2676S-ADJ?
All LM2676S-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2676S-ADJ, 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 LM2676S-ADJ part is unused and in its original packaging.
Return procedure for LM2676S-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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