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Texas Instruments LM2676SD-ADJ/NOPB
- Part No.:
- LM2676SD-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SD-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:427
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Product details
Overview
LM2676SD-ADJ/NOPB 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–37V), 260kHz fixed-frequency operation, 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 and embedded system rails.
For engineers reviewing the LM2676SD-ADJ/NOPB datasheet, LM2676SD-ADJ/NOPB pinout, LM2676SD-ADJ/NOPB application, or LM2676SD-ADJ/NOPB equivalent, key selection criteria include its ±2% output tolerance over line/load/temperature, 50µA standby quiescent current, 94% peak efficiency, TO-263-7 (KTW) package thermal performance, and feedback-based output programming.
Technical Context
The LM2676SD-ADJ/NOPB implements a voltage-mode PWM controller with a fixed 260kHz oscillator and internal high-side DMOS FET. Its feedback loop senses output voltage via an external resistor divider connected to the FB pin, enabling precise regulation across 1.2V–37V. The device operates in continuous conduction mode (CCM) at full load and transitions to discontinuous mode (DCM) under light loads.
It features integrated protection including cycle-by-cycle current limiting (3.6A–5.4A trip range), thermal shutdown, and undervoltage lockout. The ON/OFF pin provides logic-level enable control with 0.8V–2.0V threshold, while the CB pin supplies bootstrapped gate drive for the high-side switch using a 100nF capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 3A maximum continuous - supports mid-power industrial loads without external current boosting. |
| Input voltage range | 8V to 40V - compatible with 12V/24V/36V industrial bus systems and battery-backed inputs. |
| Output voltage range | 1.2V to 37V adjustable - set by external resistor divider on FB pin; enables flexible rail generation. |
| Switching frequency | 260kHz ±11% - fixed internal oscillator enables predictable EMI profile and compact magnetics sizing. |
| Feedback reference voltage | 1.21V ±1.2% - determines output accuracy; VOUT = 1.21 × (1 + R1/R2) with typical 2% total output tolerance. |
| Quiescent current (active) | 4.2–6mA - low bias consumption during regulation, minimizing no-load losses in always-on systems. |
| Standby current | 50µA - achieved when ON/OFF pin < 0.8V; enables ultra-low-power sleep states in battery-powered devices. |
| Switch RDS(ON) | 0.15–0.29Ω - low conduction loss supports >90% efficiency at 3A, reducing thermal design burden. |
Pinout & Package
LM2676SD-ADJ/NOPB uses the KTW (TO-263-7) thermally enhanced surface-mount package (10.1mm × 15.24mm), with exposed DAP connected to GND for optimal heat dissipation. Pin 1 is Switch_output, Pin 2 is Input, Pin 3 is CB (bootstrap capacitor connection), Pin 4 is GND, Pin 5 is NC, Pin 6 is FB (feedback sense), and Pin 7 is ON/OFF (enable control).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch_output) | High-side switch drain node | Switching node connecting to inductor and Schottky diode cathode; requires low-inductance layout to minimize ringing. |
| 2 (Input) | Main power input | Connects to 8–40V supply and input bypass capacitor; path to GND must be shortest possible for stability. |
| 3 (CB) | Bootstrap capacitor terminal | Connects 100nF ceramic capacitor to Switch_output; enables full enhancement of internal high-side MOSFET. |
| 4 (GND) | Power ground reference | System ground return for input/output capacitors and IC substrate; must tie to large copper area for thermal/electrical performance. |
| 5 (NC) | No-connect | Not internally bonded; leave unconnected and un-routed on PCB. |
| 6 (FB) | Feedback voltage sense | High-impedance input (85nA bias) monitoring output via resistor divider; sensitive to noise coupling - keep trace short and away from SW node. |
| 7 (ON/OFF) | Enable/disable control | Logic-compatible input (1.4V threshold); pull low or float to enable; clamped to 7V Zener for overvoltage protection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS high-side switch | Eliminates need for external power transistor and driver, reducing BOM count and layout complexity. |
| ±2% output voltage tolerance over line, load, and temperature | Ensures stable downstream logic and analog circuit operation without post-regulation trimming. |
| 260kHz fixed-frequency PWM control | Enables consistent EMI filtering design and use of standardized off-the-shelf inductors (e.g., Renco, Pulse, Coilcraft). |
| 50µA standby quiescent current | Supports energy-sensitive applications like smart meters and remote sensors requiring long battery life in sleep mode. |
| Built-in thermal shutdown and current limiting | Provides autonomous fault protection without external circuitry, improving system reliability under overload or ambient overtemperature. |
| WEBENCH® Power Designer support | Enables rapid custom design with auto-component selection, efficiency simulation, BOM generation, and schematic export. |
Applications
| Communication Module Power | Electricity Meter Rail Generation |
|---|---|
|
Use Scenario: Powers baseband processor, RF transceiver, and memory in cellular IoT modules operating from 12V or 24V field-supplied inputs. IC Role / Device Role / Timing Role: Primary buck converter generating 3.3V or 5V system rail with tight regulation and low standby draw. Use Value: Delivers 3A peak current during transmission bursts while maintaining <2% output deviation and <50µA sleep current. |
Use Scenario: Generates isolated 3.3V microcontroller and 5V sensor interface rails in DIN-rail mounted electricity meters with wide-input AC/DC supplies. IC Role / Device Role / Timing Role: Main DC-DC regulator converting rectified 12–36V DC to stable low-voltage rails under varying load and temperature. Use Value: Maintains ±2% output accuracy across –40°C to 125°C junction temperature and withstands 40V transients per IEC 61000-4-5. |
| Calling Button Panel Supply | Motor Drive Auxiliary Rail |
|
Use Scenario: Provides regulated 5V for touch interface, LED indicators, and wireless wake-up circuitry in building access panels powered from PoE or 24V DC. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator handling intermittent 2A loads with fast transient response. Use Value: Achieves 94% efficiency at 3A/12V input and recovers from 500mA→3A load steps within 100µs (typical). |
Use Scenario: Supplies 12V gate drive and 5V logic power for motor control ICs in HVAC blowers and industrial pumps with 24V/36V bus inputs. IC Role / Device Role / Timing Role: Secondary power stage supporting isolated gate drivers and MCU peripherals in noisy motor environments. Use Value: Withstands 40V input surges and delivers clean, low-noise output due to fixed-frequency operation and integrated current limiting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596-ADJ | Lower 1.5A output current, 150kHz switching frequency, higher RDS(ON) (0.22Ω typ), wider VIN (4.5–40V) | Suitable for lower-current (<1.5A), cost-sensitive designs where size and efficiency are secondary | Choose LM2596-ADJ only if load current ≤1.5A and 260kHz EMI constraints do not apply. |
| LMR51430RNXR | 3A synchronous buck, 4.5–36V input, 500kHz/1.1MHz selectable frequency, 0.045Ω high-side RDS(ON), integrated low-side FET | Offers higher efficiency (>95%), smaller solution size, and better light-load performance but requires more complex layout | Select LMR51430RNXR when upgrading for efficiency, footprint reduction, or modern synchronous topology - not drop-in compatible. |
Compared with LM2676SD-ADJ/NOPB, LM2596-ADJ trades output capability and frequency for cost and legacy compatibility, while LMR51430RNXR replaces the external diode and improves efficiency through synchronous rectification - both require PCB redesign and cannot substitute without validation.
Availability
LM2676SD-ADJ/NOPB 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 support, and RoHS-compliant packaging.
Supply support for LM2676SD-ADJ/NOPB 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 LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in non-isolated DC-DC buck applications where minimal external components, thermal robustness, and wide input range are critical.
FAQ
What is the maximum output voltage that can be set with LM2676SD-ADJ/NOPB?
The LM2676SD-ADJ/NOPB supports an adjustable output voltage range from 1.2V to 37V, determined by the external resistor divider connected to the FB pin. The feedback reference voltage is 1.21V, so VOUT = 1.21 × (1 + R1/R2). At 37V output, the upper resistor must be sized to limit divider current and maintain accuracy - TI recommends keeping total divider current between 100µA and 1mA for optimal performance. The LM2676SD-ADJ/NOPB maintains ±2% regulation across this full range under specified line, load, and temperature conditions.
Does LM2676SD-ADJ/NOPB require an external Schottky diode?
Yes, the LM2676SD-ADJ/NOPB requires an external Schottky diode connected between the Switch_output (Pin 1) and GND. This diode provides the freewheeling path for inductor current when the internal high-side DMOS switch is off. TI recommends diodes with ≤0.5V forward voltage and ≥3A average current rating (e.g., SB560, SS34). Unlike synchronous buck converters, the LM2676SD-ADJ/NOPB does not integrate a low-side switch, so the diode is mandatory for proper operation and efficiency. Omitting it will cause failure or severe instability.
What thermal performance can be expected from LM2676SD-ADJ/NOPB in the KTW package?
In the KTW (TO-263-7) package, the LM2676SD-ADJ/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 35°C/W with 0.4896 in² (3.6× package area) of 1 oz copper, and as low as 26°C/W with 1.0064 in² (7.4× package area) of copper plus thermal vias. The exposed DAP must be soldered to a solid ground plane for effective heat transfer. Under 3A load at 12V input, typical junction temperature rise is <45°C above ambient with adequate copper - enabling reliable operation up to 125°C junction temperature without forced air cooling.
Can LM2676SD-ADJ/NOPB be synchronized to an external clock?
No, the LM2676SD-ADJ/NOPB does not support external clock synchronization. Its 260kHz oscillator is fixed-frequency and internally generated - no sync pin or frequency adjustment capability is provided. This differs from newer regulators like the LMR51430, which offers selectable 500kHz/1.1MHz operation. For EMI-sensitive applications requiring frequency dithering or phase alignment with other converters, the LM2676SD-ADJ/NOPB is not suitable; alternative parts with sync functionality must be selected. The LM2676SD-ADJ/NOPB relies on fixed-frequency operation for predictable filter design and WEBENCH® compatibility.
How does the ON/OFF pin function on LM2676SD-ADJ/NOPB?
The ON/OFF pin (Pin 7) of the LM2676SD-ADJ/NOPB enables logic-level control: voltage >1.4V (typical) turns the regulator ON, while <0.8V forces shutdown with 50µA standby current. The pin has an internal ~20µA pullup and 7V Zener clamp. It can be driven directly by a microcontroller GPIO or open-collector transistor. When unused, it may be left floating (default ON). During shutdown, all regulation ceases, the switch stops toggling, and output voltage decays through the load and feedback divider. The LM2676SD-ADJ/NOPB resumes regulation within microseconds after ON/OFF rises above threshold.
LM2676SD-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 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)
LM2676SD-ADJ/NOPB FAQ
1.How can I place an order for LM2676SD-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SD-ADJ/NOPB 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 LM2676SD-ADJ/NOPB reliable?
The price and inventory of LM2676SD-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2676SD-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SD-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SD-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SD-ADJ/NOPB?
LM2676SD-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SD-ADJ/NOPB 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 LM2676SD-ADJ/NOPB?
For technical support, including LM2676SD-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SD-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2676SD-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SD-ADJ/NOPB 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 LM2676SD-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SD-ADJ/NOPB?
All LM2676SD-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SD-ADJ/NOPB, 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 LM2676SD-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2676SD-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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