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Texas Instruments LM22676TJ-ADJ/NOPB
- Part No.:
- LM22676TJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22676TJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,585
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Product details
Overview
LM22676TJ-ADJ/NOPB from Texas Instruments is a 42 V, 3 A synchronous step-down DC/DC regulator with adjustable output (as low as 1.285 V), 500 kHz fixed switching frequency, and integrated 120 mΩ N-channel MOSFET. It operates from 4.5 V to 42 V input, delivers ±1.5% feedback reference accuracy, and supports industrial embedded power conversion in harsh environments.
For engineers reviewing the LM22676TJ-ADJ/NOPB datasheet, LM22676TJ-ADJ/NOPB pinout, LM22676TJ-ADJ/NOPB application, or LM22676TJ-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, precision enable threshold (1.6 V typ), integrated bootstrap diode, soft-start timing (500 µs typ), and thermal shutdown at 150°C - all critical for reliable 24 V/12 V rail regulation in telecom and industrial systems.
Technical Context
The LM22676TJ-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation is optimized for output voltages ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It integrates a high-side N-channel MOSFET (120 mΩ RDS(ON) in PFM package), bootstrap gate driver with integrated diode, precision enable comparator (1.6 V threshold, 0.6 V hysteresis), and current-limit protection (3.4–5.3 A). Thermal shutdown activates at 150°C with 15°C hysteresis, and minimum on-time (100 ns) enables high step-down ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to unregulated 24 V/12 V industrial rails without pre-regulation. |
| Output Current | Up to 3 A continuous - sufficient for powering FPGAs, microcontrollers, and analog subsystems in embedded systems. |
| Switching Frequency | 500 kHz (±20%) - enables compact magnetics and low-output-ripple designs with standard 10 µH inductors. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; used with external resistor divider for precise VOUT tuning. |
| RDS(ON) | 120 mΩ (PFM package) - limits conduction loss at full load, supporting >90% peak efficiency at 12 V→3.3 V conversion. |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - minimizes standby power in always-on industrial controllers. |
| Enable Threshold | 1.6 V (typ), 0.6 V hysteresis - allows clean power sequencing using simple resistor dividers from upstream rails. |
Pinout & Package
LM22676TJ-ADJ/NOPB uses the PFM (exposed pad) 8-pin package (4.89 mm × 3.90 mm), with the exposed pad thermally and electrically connected to GND for enhanced thermal dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node | Drives external inductor; swings from ~0 V to VIN; requires low-inductance layout to minimize ringing. |
| 2 VIN | Main input supply | Accepts 4.5–42 V; must be decoupled with ≥10 µF ceramic capacitor near pin. |
| 3 BOOT | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; powers high-side gate driver during each cycle. |
| 4 GND | System ground | Power and signal return; tied to exposed pad for thermal and electrical integrity. |
| 5 FB | Feedback input | High-impedance (230 nA bias) node sensing output voltage via resistor divider; sensitive to noise. |
| 6 EN | Enable control | Logic-level input; <1.6 V disables regulator (25 µA IQ); >2.2 V enables; internal 6 µA pullup. |
| 7 NC | No connect | Not electrically bonded; serves as thermal conductor only - must be grounded on PCB. |
| 8 NC | No connect | Not electrically bonded; serves as thermal conductor only - must be grounded on PCB. |
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 external diode requirement in boot circuit - simplifies layout and improves reliability over discrete solutions. |
| 100 ns minimum on-time | Enables high input-to-output voltage ratios (e.g., 42 V → 3.3 V at 500 kHz) without pulse-skipping instability. |
| Stable with ceramic output capacitors | Supports low-ESR, high-frequency ceramics (e.g., X5R/X7R) - avoids bulk electrolytics and extends lifetime. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction; restarts at ~135°C - prevents thermal runaway during overload or poor heatsinking. |
Applications
| Industrial Motor Control | Telecom Power Shelf |
|---|---|
Use Scenario: Powering gate drivers, isolation amplifiers, and position sensors in servo drives operating from 24 V bus. IC Role / Device Role / Timing Role: Primary 3.3 V/5 V point-of-load regulator delivering stable, low-noise supply under dynamic load transients. Use Value: 500 kHz switching enables fast transient response to PWM-driven motor current spikes while maintaining <1% output deviation. |
Use Scenario: Converting -48 V telecom rectified bus to +5 V for control logic and management ASICs in modular power shelves. IC Role / Device Role / Timing Role: High-voltage buck converter handling wide input variation (−36 V to −72 V via auxiliary supply conditioning) and cold-swap events. Use Value: 42 V absolute max rating and UVLO (4.3 V rising) ensure robust start-up and brownout immunity during line dips and hot-plug transitions. |
| Ruggedized Embedded Controller | Automotive Body Control Module (BCM) |
Use Scenario: Providing regulated 3.3 V for ARM Cortex-M7 MCU and CAN transceivers in factory automation PLCs exposed to 40 V load-dump transients. IC Role / Device Role / Timing Role: Input-protected, thermally robust DC/DC stage placed after front-end TVS/clamp circuitry. Use Value: 120 mΩ RDS(ON) and SO PowerPAD-compatible thermal design sustain 3 A load at 125°C ambient without derating. |
Use Scenario: Generating 5 V for microcontroller, LIN transceivers, and LED drivers in non-safety-critical BCMs (non-Q1 variant used in cost-sensitive designs). IC Role / Device Role / Timing Role: Secondary regulator fed from main 12 V battery rail; enabled only during ignition-on state. Use Value: Precision enable threshold (1.6 V) and hysteresis allow direct connection to ignition-switched 5 V reference, eliminating external supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22677TJ-ADJ/NOPB | Same pinout, 500 kHz, but rated for 4.5–60 V input and 5 A output; higher RDS(ON) (150 mΩ) in PFM package. | Required for 48 V industrial or PoE++ systems needing >3 A; not drop-in for 42 V max designs. | Select when input exceeds 42 V or output current >3 A is needed; verify thermal margin with higher RDS(ON). |
| TPS54340DDAR | 42 V, 3.5 A, 500 kHz; external compensation; no integrated bootstrap diode; 105 mΩ RDS(ON); wider temp range (–40°C to 150°C). | Suitable for designs requiring custom loop shaping or tighter thermal specs; demands additional bootstrap diode and compensation components. | Choose when advanced loop tuning or extended junction temperature capability is mandatory; accept added BOM and layout complexity. |
Compared with LM22676TJ-ADJ/NOPB, LM22677TJ-ADJ/NOPB offers higher input voltage headroom and output current but trades off conduction loss, while TPS54340DDAR provides greater design flexibility and thermal margin at the cost of increased component count and layout effort.
Availability
LM22676TJ-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial motor control, telecom power shelf, and ruggedized embedded controller applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for LM22676TJ-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 DC/DC conversion.
The LM22676 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in industrial, telecom, and embedded power applications where minimal external components, internal compensation, and robust thermal performance are essential.
FAQ
What is the minimum output voltage achievable with LM22676TJ-ADJ/NOPB?
The LM22676TJ-ADJ/NOPB achieves a minimum output voltage of 1.285 V (typical), set by its internal feedback reference voltage. This value is specified over temperature (–40°C to 125°C) with ±1.5% accuracy. The actual output is determined by the external resistor divider connected between VOUT, FB, and GND - and must be configured to avoid exceeding the FB pin's absolute maximum voltage of 7 V. Designers should use RFBB = 1 kΩ as a starting point for noise immunity and minimum load compliance.
Does LM22676TJ-ADJ/NOPB require an external bootstrap diode?
No, LM22676TJ-ADJ/NOPB integrates a bootstrap diode within the IC, eliminating the need for an external component in the BOOT-to-SW path. A 10 nF ceramic capacitor must still be placed directly between BOOT and SW pins with short, low-inductance traces. This integration reduces bill-of-materials count, improves reliability, and simplifies PCB layout - distinguishing it from many competing controllers that mandate external bootstrap diodes.
Can LM22676TJ-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22676TJ-ADJ/NOPB is explicitly characterized and stabilized for use with low-ESR ceramic output capacitors - including X5R and X7R types - without requiring bulk electrolytic or tantalum support. This is enabled by its internally compensated voltage-mode architecture and stability optimization for ceramic-based output filters. Designs using ≥22 µF total ceramic capacitance typically achieve phase margin >45° and adequate transient response per TI's recommended layouts.
What is the purpose of the NC pins on LM22676TJ-ADJ/NOPB?
The two NC pins (pins 7 and 8) on LM22676TJ-ADJ/NOPB are not electrically connected internally but serve as thermal conduction paths from the die to the PCB. They must be soldered to a solid GND copper pour on the board to maximize heat dissipation and improve thermal resistance (RθJA reduced from 60°C/W to 22°C/W when properly implemented). Leaving them floating degrades thermal performance and risks premature thermal shutdown under sustained 3 A loads.
How does the enable function behave during input undervoltage conditions?
The LM22676TJ-ADJ/NOPB features dual enable mechanisms: a precision EN pin (1.6 V threshold, 0.6 V hysteresis) and an internal UVLO (4.3 V rising, 3.9 V falling). When EN is left floating or pulled high, the internal UVLO dominates - preventing startup until VIN exceeds 4.3 V. If EN is actively driven (e.g., via resistor divider from VIN), it overrides UVLO and allows programmable turn-on/off thresholds. In either case, shutdown draws only 25 µA (typ), preserving system standby power.
LM22676TJ-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-7 Thin
- 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:
- TO-263-7 Thin
LM22676TJ-ADJ/NOPB FAQ
1.How can I place an order for LM22676TJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22676TJ-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 LM22676TJ-ADJ/NOPB reliable?
The price and inventory of LM22676TJ-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 LM22676TJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22676TJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22676TJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22676TJ-ADJ/NOPB?
LM22676TJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22676TJ-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 LM22676TJ-ADJ/NOPB?
For technical support, including LM22676TJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22676TJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22676TJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22676TJ-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 LM22676TJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22676TJ-ADJ/NOPB?
All LM22676TJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22676TJ-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 LM22676TJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22676TJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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