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Texas Instruments LM22676MRX-ADJ/NOPB
- Part No.:
- LM22676MRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22676MRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,054
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Product details
Overview
LM22676MRX-ADJ/NOPB from Texas Instruments is a 42 V, 3 A synchronous step-down DC/DC regulator in an 8-pin SO PowerPAD™ package, featuring voltage-mode PWM control, integrated 120 mΩ N-channel MOSFET switch, 500 kHz fixed switching frequency, and adjustable output down to 1.285 V. It delivers >90% efficiency in industrial power rails converting 24 V or 12 V inputs to 3.3 V or 5 V system supplies.
For engineers reviewing the LM22676MRX-ADJ/NOPB datasheet, LM22676MRX-ADJ/NOPB pinout, LM22676MRX-ADJ/NOPB application, or LM22676MRX-ADJ/NOPB equivalent, key selection criteria include its ±1.5% feedback reference accuracy, 25 µA shutdown current, internal soft-start (500 µs), integrated bootstrap diode, and thermal shutdown at 150°C - all critical for reliable embedded power design.
Technical Context
The LM22676MRX-ADJ/NOPB implements a voltage-mode PWM architecture with input voltage feedforward to stabilize loop gain across wide VIN ranges (4.5 V–42 V). Its internal Type III compensation is optimized for outputs ≤5 V, eliminating external compensation components.
It integrates a high-side N-channel MOSFET (RDS(ON) = 0.12 Ω typ) and uses a bootstrap capacitor between BOOT and SW to drive the gate. Minimum on-time (100 ns) and off-time (200 ns) constrain duty-cycle limits, enabling stable operation down to 1.285 V output while supporting high input-to-output ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 24 V industrial rails and 12 V automotive batteries without pre-regulation. |
| Output Current | Up to 3 A continuous - sufficient for powering microcontrollers, FPGAs, and communication ICs in compact systems. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise 3.3 V, 2.5 V, or custom low-voltage rails via resistor divider. |
| Switching Frequency | 500 kHz ±20% - allows use of small 4.7 µH–10 µH inductors and ceramic output capacitors for compact, low-profile designs. |
| RDS(ON) | 0.12 Ω (typ) - reduces conduction loss and improves full-load efficiency (>90% at 12 V→3.3 V/2 A). |
| Shutdown Current | 25 µA (typ) - enables ultra-low-power system standby modes without external enable circuitry. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or poor PCB thermal design; auto-recovery at ~135°C. |
Pinout & Package
LM22676MRX-ADJ/NOPB is housed in an 8-pin SO PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced thermal performance (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 and ringing. |
| 2 (VIN) | Main input supply | Accepts 4.5–42 V; must be bypassed with ≥10 µF ceramic capacitor near pin for transient stability. |
| 3 (BOOT) | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; provides gate drive voltage for internal high-side MOSFET. |
| 4 (GND) | Power ground | System return path; ties to exposed pad; must be low-impedance copper pour for thermal and noise control. |
| 5 (EN) | Enable control | Logic-compatible input; 1.6 V threshold with 0.6 V hysteresis; pulls up internally (6 µA); enables sequencing and UVLO. |
| 6 (FB) | Feedback input | High-impedance (230 nA bias) node sensing output voltage via resistor divider; placement critical for noise immunity. |
| 7 (VIN) | Second input connection | Duplicate VIN pin for improved current sharing and reduced trace resistance; must connect to same input net as Pin 2. |
| 8 (EP) | Exposed thermal pad | Internally connected to GND; must be soldered to large PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Diode | Eliminates external bootstrap diode; simplifies layout and reduces BOM count in high-side gate drive path. |
| Internal Soft-Start | Fixed 500 µs ramp time prevents inrush current and output overshoot during power-up without external RC network. |
| Stable with Ceramic Capacitors | Designed for low-ESR ceramic output caps (e.g., 22 µF X5R); avoids instability issues common with electrolytic alternatives. |
| Precision Enable Input | 1.6 V turn-on threshold with 0.6 V hysteresis enables clean power sequencing and external undervoltage lockout (UVLO). |
| WEBENCH® Enabled | Fully supported by TI's WEBENCH® Designer for automated component selection, efficiency simulation, and thermal analysis. |
Applications
| Industrial PLC I/O Module | Telecom Remote Radio Unit |
|---|---|
|
Use Scenario: Powering isolated analog front-ends and digital logic in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 3.3 V/2 A buck regulator converting 24 V field bus to MCU and ADC supply rails. Use Value: 42 V max input withstands load-dump transients; ±1.5% reference ensures accurate sensor signal conditioning. |
Use Scenario: Generating 5 V and 3.3 V rails inside outdoor 4G/5G base station remote radio heads. IC Role / Device Role / Timing Role: Point-of-load converter for FPGA configuration, RF transceiver bias, and interface logic. Use Value: –40°C to 125°C junction rating supports uncooled outdoor deployment; 500 kHz switching eases EMI filtering. |
| Embedded Medical Diagnostic Device | Automotive Body Control Module |
|
Use Scenario: Supplying low-noise 2.5 V and 1.8 V rails to precision ADCs and ARM Cortex-M cores in portable ultrasound units. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with tight feedback tolerance for analog signal chain integrity. Use Value: 1.285 V reference enables accurate sub-3 V outputs; internal compensation avoids layout-sensitive external networks. |
Use Scenario: Converting 12 V battery rail to 5 V for CAN transceivers and 3.3 V for microcontroller in vehicle door modules. IC Role / Device Role / Timing Role: Main system power regulator meeting AEC-Q100 Grade 1 requirements (–40°C to +125°C). Use Value: 25 µA shutdown current extends battery life in sleep mode; integrated thermal protection handles engine-bay ambient spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRX-ADJ/NOPB | Lower 36 V max input, 2.5 A output, same SO PowerPAD package and pinout. | Suitable for 12 V–24 V systems without 42 V transients; lower RDS(ON) (100 mΩ) improves light-load efficiency. | Select when input never exceeds 36 V and peak load is ≤2.5 A; offers cost and thermal advantage in benign environments. |
| TPS54340DDAR | 42 V input, 3.5 A output, 3.5 V–42 V start-up, no integrated bootstrap diode. | Requires external bootstrap diode and external compensation; wider VIN start-up range but higher BOM complexity. | Choose when higher output current or cold-cranking support (3.5 V start) is required, and layout can accommodate extra components. |
Compared with LM22676MRX-ADJ/NOPB, LM22670MRX-ADJ/NOPB trades input voltage headroom for lower conduction loss, while TPS54340DDAR adds start-up robustness at the cost of design complexity - making LM22676MRX-ADJ/NOPB optimal for balanced 42 V/3 A industrial applications requiring minimal external parts.
Availability
LM22676MRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom infrastructure, and embedded medical devices requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM22676MRX-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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM22676 series belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in industrial, automotive, and telecom power applications where fast design-in, minimal external components, and robust operation under harsh conditions are essential.
FAQ
What is the minimum output voltage achievable with LM22676MRX-ADJ/NOPB?
The LM22676MRX-ADJ/NOPB has a nominal feedback reference voltage of 1.285 V, which sets the lowest possible output voltage when using the adjustable version. With a precision ±1.5% reference tolerance, the actual minimum regulated output is 1.266 V (min) over temperature and line conditions. This enables reliable generation of 1.8 V, 2.5 V, and 3.3 V rails using standard resistor dividers, and is confirmed in Section 6.6 of the SNVS587L datasheet.
Does LM22676MRX-ADJ/NOPB require an external bootstrap diode?
No, LM22676MRX-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component between BOOT and SW pins. This is explicitly stated in the "Features" section of the datasheet and verified in the functional block diagram. Users only need to place a 10 nF ceramic capacitor from BOOT to SW - a key differentiator from competitors like TPS54340 that require external bootstrap diodes.
What is the thermal resistance (RθJA) of LM22676MRX-ADJ/NOPB in its SO PowerPAD package?
The LM22676MRX-ADJ/NOPB in the SO PowerPAD™ package has a junction-to-ambient thermal resistance (RθJA) of 60°C/W, as specified in Table 6.5 of the SNVS587L datasheet. This value assumes standard JEDEC 2-layer board layout; actual performance improves significantly with proper thermal pad soldering to a multi-layer ground plane, enabling full 3 A output at elevated ambient temperatures.
Can LM22676MRX-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22676MRX-ADJ/NOPB is explicitly characterized and stabilized for use with low-ESR ceramic output capacitors - a core feature highlighted in the "Features" list and validated in the "Stability Considerations" section. Designs using ≥22 µF X5R/X7R ceramics meet phase margin and transient response requirements without added series resistance or electrolytic supplementation.
What is the purpose of the dual VIN pins (Pins 2 and 7) on LM22676MRX-ADJ/NOPB?
Pins 2 and 7 on LM22676MRX-ADJ/NOPB are both connected to the internal VIN rail and serve to reduce effective input trace resistance and inductance. This dual-pin configuration improves high-frequency decoupling, minimizes voltage drop under 3 A pulsed loads, and enhances stability - especially critical in noisy industrial environments. The datasheet's Pin Functions table confirms both pins are electrically identical VIN inputs.
LM22676MRX-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
LM22676MRX-ADJ/NOPB FAQ
1.How can I place an order for LM22676MRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22676MRX-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 LM22676MRX-ADJ/NOPB reliable?
The price and inventory of LM22676MRX-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 LM22676MRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22676MRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22676MRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22676MRX-ADJ/NOPB?
LM22676MRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22676MRX-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 LM22676MRX-ADJ/NOPB?
For technical support, including LM22676MRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22676MRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22676MRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22676MRX-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 LM22676MRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22676MRX-ADJ/NOPB?
All LM22676MRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22676MRX-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 LM22676MRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22676MRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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