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Texas Instruments LM22676MRE-ADJ/NOPB
- Part No.:
- LM22676MRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22676MRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,096
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Product details
Overview
LM22676MRE-ADJ/NOPB from Texas Instruments is a 42 V, 3 A adjustable-output synchronous step-down DC/DC regulator in SO PowerPAD (DDA) package. It integrates a 120 mΩ N-channel MOSFET switch, operates at 500 kHz fixed frequency, delivers ±1.5% feedback reference accuracy down to 1.285 V output, and supports input range 4.5–42 V - ideal for industrial power conversion from 24 V rails.
For engineers reviewing the LM22676MRE-ADJ/NOPB datasheet, LM22676MRE-ADJ/NOPB pinout, LM22676MRE-ADJ/NOPB application, or LM22676MRE-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, integrated bootstrap diode, precision enable with 1.6 V threshold and 0.6 V hysteresis, 25 µA shutdown current, and thermal shutdown at 150°C.
Technical Context
The LM22676MRE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN variations. Its internal Type III compensation network is optimized for output voltages ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It uses a floating high-side gate driver powered by an external bootstrap capacitor between BOOT and SW pins, requiring ≥5 mA minimum load for full recharge during minimum off-time (100 ns). The device enforces strict duty-cycle limits: minimum on-time (100 ns) prevents regulation failure at high VIN/VOUT ratios, while minimum off-time ensures bootstrap capacitor recharge integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from unregulated 24 V, 12 V, or PoE-derived rails without pre-regulation |
| Output Current | Up to 3 A continuous - sufficient for FPGA core, microcontroller, or industrial I/O power domains |
| Switching Frequency | 500 kHz ±20% - enables compact 10 µH inductors and <100 µF ceramic output capacitance |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise 3.3 V, 2.5 V, or 1.8 V generation via resistor divider |
| RDS(ON) | 120 mΩ (SO PowerPAD) - reduces conduction loss at 3 A, supporting >90% peak efficiency at mid-load |
| Enable Threshold | 1.6 V typical with 0.6 V hysteresis - allows clean power sequencing using simple resistor dividers from upstream supplies |
| Shutdown Current | 25 µA typical - minimizes standby drain in battery-backed or always-on systems |
Pinout & Package
LM22676MRE-ADJ/NOPB is housed in an 8-pin SO PowerPAD (DDA) package with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node | Drives external inductor; swings from GND to VIN; requires low-inductance layout to minimize EMI |
| 2 VIN | Power input | Accepts 4.5–42 V; must be decoupled with ≥10 µF ceramic near pin |
| 3 BOOT | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; powers high-side gate driver |
| 4 GND | System ground | Reference for all analog and power circuits; tied to exposed pad |
| 5 EN | Enable control | Logic-level input; 1.6 V threshold turns device on; <1.3 V disables regulator |
| 6 FB | Feedback input | High-impedance (230 nA bias) node sensing output voltage divider; sensitive to noise |
| 7 NC | No connect | Thermal pad conductor only; no electrical function; must remain unconnected |
| 8 NC | No connect | Thermal pad conductor only; no electrical function; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - reduces BOM count and design iteration time |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode - simplifies layout and improves reliability |
| Soft-start (500 µs typical) | Prevents inrush current and output overshoot during power-up - protects downstream loads and capacitors |
| Thermal shutdown (150°C) | Halts switching until junction cools to ~135°C - prevents permanent damage under overload or poor heatsinking |
| Stable with ceramic output capacitors | Supports low-ESR MLCCs (no electrolytic required) - improves longevity and reduces board area |
Applications
| Industrial PLC Power Supply | Telecom Line Card Bias |
|---|---|
Use Scenario: Regulating 24 V backplane to 3.3 V for programmable logic controllers with real-time I/O monitoring. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 3.3 V at up to 3 A with tight line/load regulation. Use Value: Enables single-stage conversion from 24 V rail without intermediate 5 V stage - reduces component count and improves system efficiency. |
Use Scenario: Generating 5 V and 12 V bias rails for optical transceivers and SerDes interfaces in telecom line cards. IC Role / Device Role / Timing Role: Adjustable-output regulator configured for 5 V output using FB divider; provides stable supply under dynamic load steps. Use Value: 500 kHz switching frequency ensures fast transient response to burst traffic-induced load changes - maintains signal integrity. |
| Automotive Body Control Module | Embedded System Core Rail |
Use Scenario: Converting 12 V vehicle battery to 2.5 V for microcontroller and CAN transceiver in body control unit. IC Role / Device Role / Timing Role: High-input-voltage buck regulator operating across cold-crank (4.5 V) to load-dump (42 V) conditions. Use Value: Wide 4.5–42 V input range and –40°C to 125°C junction rating meet AEC-Q100 Grade 1 requirements without derating. |
Use Scenario: Providing 1.8 V core voltage for ARM Cortex-M7 MCU in industrial gateway with isolated Ethernet and wireless connectivity. IC Role / Device Role / Timing Role: Adjustable-output buck regulator set to 1.8 V via precision FB divider; supplies CPU core with low-noise, high PSRR power. Use Value: ±1.5% feedback reference accuracy and internal compensation ensure stable core voltage under variable processing loads - prevents timing violations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22674MRE-ADJ/NOPB | 2.5 A output current; identical pinout and control features; lower RDS(ON) (100 mΩ) | Suitable where 3 A headroom is unnecessary and thermal budget is constrained | Select when load current consistently remains below 2.5 A and smaller solution size is prioritized |
| TPS54340DDAR | 3 A output; 42 V max input; adjustable output; but requires external compensation and bootstrap diode | Used where design flexibility (e.g., custom loop response) outweighs simplicity of integration | Choose only if specific transient performance tuning or non-standard frequency is required |
Compared with LM22674MRE-ADJ/NOPB, the LM22676MRE-ADJ/NOPB delivers higher current capability and matches automotive temperature range, while TPS54340DDAR trades integration for configurability - making LM22676MRE-ADJ/NOPB optimal for rapid, robust 3 A designs where minimal external components are critical.
Availability
LM22676MRE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded system core rail applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant variants.
Supply support for LM22676MRE-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, serving industrial, automotive, and communications markets.
The LM22676 product line delivers SIMPLE SWITCHER® step-down regulators designed for high-voltage industrial and automotive power conversion with minimal external components and WEBENCH® design integration.
FAQ
What is the minimum output voltage achievable with LM22676MRE-ADJ/NOPB?
The LM22676MRE-ADJ/NOPB has a nominal feedback reference voltage of 1.285 V, which sets the lowest possible output voltage when the FB pin is connected directly to VOUT. With proper resistor divider design and layout, the device reliably regulates down to this value across –40°C to 125°C junction temperature. Output voltages below 1.285 V are not supported by the internal reference and cannot be achieved using LM22676MRE-ADJ/NOPB.
Does LM22676MRE-ADJ/NOPB require an external bootstrap diode?
No, LM22676MRE-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component. The BOOT pin connects directly to the SW node via a 10 nF ceramic capacitor, and the internal diode charges the bootstrap capacitor during the off-time. This integration reduces bill-of-materials count, PCB area, and potential failure points compared to controllers requiring discrete bootstrap diodes.
Can LM22676MRE-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22676MRE-ADJ/NOPB is explicitly characterized and stabilized for use with low-ESR ceramic capacitors - no electrolytic or tantalum capacitors are required. The internal compensation and voltage-mode architecture maintain stability with typical 10–100 µF X7R/X5R MLCCs, enabling compact, high-reliability designs suitable for automotive and industrial environments where capacitor lifetime is critical.
What is the purpose of the NC pins on LM22676MRE-ADJ/NOPB?
The two NC pins (pins 7 and 8) on LM22676MRE-ADJ/NOPB serve solely as thermal conductors connected to the exposed PowerPAD. They are not electrically bonded to any internal circuitry and must remain unconnected in the schematic. Their mechanical function is to enhance heat transfer from the die to the PCB ground plane - correct soldering of the exposed pad and NC pins to a large copper pour is essential for achieving the specified RθJA of 60°C/W.
How does the enable pin (EN) behave during input undervoltage conditions?
The LM22676MRE-ADJ/NOPB includes both internal UVLO (4.3 V rising, 3.9 V falling) and a precision enable input. When EN is used actively, it overrides internal UVLO: pulling EN below 1.3 V disables the regulator regardless of VIN, drawing only 25 µA. This allows designers to implement custom UVLO thresholds - for example, disabling the part before battery discharge reaches critical levels - using a resistor divider from VIN to EN, independent of the internal 4.3 V threshold.
LM22676MRE-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.285V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22676MRE-ADJ/NOPB FAQ
1.How can I place an order for LM22676MRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22676MRE-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 LM22676MRE-ADJ/NOPB reliable?
The price and inventory of LM22676MRE-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 LM22676MRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22676MRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22676MRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22676MRE-ADJ/NOPB?
LM22676MRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22676MRE-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 LM22676MRE-ADJ/NOPB?
For technical support, including LM22676MRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22676MRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22676MRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22676MRE-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 LM22676MRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22676MRE-ADJ/NOPB?
All LM22676MRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22676MRE-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 LM22676MRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22676MRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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