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Texas Instruments LM22676QTJE-ADJ/NOPB
- Part No.:
- LM22676QTJE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22676QTJE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
LM22676QTJE-ADJ/NOPB from Texas Instruments is a 42 V, 3 A adjustable-output synchronous step-down DC/DC regulator in HSOP-8 PowerPAD package, featuring voltage-mode PWM control, integrated 120 mΩ N-channel MOSFET switch, 500 kHz fixed switching frequency, and ±1.5% feedback reference accuracy (1.285 V typ). It delivers high efficiency (>90%) in industrial power rails converting 24 V or 12 V inputs to sub-5 V logic supplies.
For engineers reviewing the LM22676QTJE-ADJ/NOPB datasheet, LM22676QTJE-ADJ/NOPB pinout, LM22676QTJE-ADJ/NOPB application, or LM22676QTJE-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance with exposed pad, internal compensation for ADJ versions, soft-start timing (500 µs), and enable threshold hysteresis (0.6 V).
Technical Context
The LM22676QTJE-ADJ/NOPB implements a voltage-mode PWM architecture 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 integrates a bootstrap gate driver with internal diode, requiring only an external 10 nF ceramic capacitor between BOOT and SW pins. Minimum on-time (100 ns) and off-time (200 ns) constrain duty-cycle limits, defining practical VIN/VOUT conversion ratios - e.g., supporting 24 V-to-3.3 V conversion at full load while maintaining regulation.
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 systems without pre-regulation. |
| Output Current | 3 A continuous - sustains full load under worst-case thermal conditions with proper PCB copper area on exposed pad. |
| Switching Frequency | 500 kHz ±20% - enables compact 2.2 µH–10 µH inductors and reduces output ripple without compromising transient response. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; used with external resistor divider to configure VOUT from 1.285 V to >5 V. |
| RDS(ON) | 120 mΩ (typ) - determines conduction loss at 3 A; contributes to >90% peak efficiency at mid-load with proper layout. |
| Soft-Start Time | 500 µs (typ) - prevents inrush current during power-up; internally fixed and not user-adjustable. |
| Enable Threshold | 1.6 V (falling), 2.2 V (rising) with 0.6 V hysteresis - allows precise sequencing with resistor dividers from other supply rails. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and automotive environments; thermal shutdown triggers at 150°C. |
Pinout & Package
LM22676QTJE-ADJ/NOPB uses the HSOP-8 PowerPAD (DDA) package with 4.89 mm × 3.90 mm body and thermally enhanced exposed pad soldered to PCB ground plane for optimal 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 routing to minimize EMI and ringing. |
| 2 (VIN) | Main input supply | Accepts 4.5–42 V; must be decoupled with ≥10 µF ceramic capacitor near pin to suppress high-frequency noise. |
| 3 (BOOT) | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; powers high-side gate driver; requires short, wide traces. |
| 4 (GND) | System ground | Analog and power ground reference; tied directly to exposed pad; forms return path for FB, EN, and internal circuits. |
| 5 (FB) | Feedback input | High-impedance (230 nA bias) node sensing output voltage via resistor divider; placement critical for noise immunity. |
| 6 (EN) | Enable control | Logic-level input with precision UVLO; pulls up internally (6 µA); floats high to enable; <1.6 V disables regulator. |
| 7 (NC) | No connect | Not bonded internally; may serve as thermal conductor; must remain unconnected or grounded per layout guidelines. |
| 8 (NC) | No connect | Not bonded internally; electrically isolated; used for thermal conduction only; no circuit connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network; simplifies design for 1.285 V–5 V outputs using standard ceramic output caps. |
| Integrated bootstrap diode | Reduces BOM count by removing external bootstrap diode; ensures reliable gate drive for high-side MOSFET across temperature. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability X7R/X5R MLCCs instead of bulkier electrolytics; improves long-term stability and lifetime. |
| Precision enable with UVLO | Allows controlled power sequencing and system-level undervoltage protection; hysteresis prevents chatter during brownout conditions. |
| Thermal shutdown & current limiting | Protects against sustained overloads and PCB overheating; shuts down at 150°C junction temp; recovers at ~135°C after cooldown. |
| WEBENCH® enabled | Supports full design-in via TI's online tool: auto-selects inductors, capacitors, diodes; simulates efficiency, thermal, and transient response. |
Applications
| Industrial PLC I/O Power | Telecom Line Card Bias |
|---|---|
|
Use Scenario: Powering isolated digital I/O modules in programmable logic controllers operating from 24 V DC rails. IC Role / Device Role / Timing Role: Primary buck regulator generating 3.3 V or 5 V logic supply for microcontrollers, isolators, and level shifters. Use Value: Delivers 3 A at >90% efficiency with minimal thermal rise on standard 2-layer PCBs due to PowerPAD thermal path. |
Use Scenario: Generating local 3.3 V bias for SERDES transceivers and PHY ICs on telecom line cards fed from –48 V or 24 V backplanes. IC Role / Device Role / Timing Role: Point-of-load (POL) converter stepping down intermediate 12 V rail to low-noise 3.3 V supply. Use Value: 500 kHz switching enables small 4.7 µH shielded inductors and tight layout; soft-start prevents bus droop during hot-swap events. |
| Automotive Body Control Module | Embedded System Core Rail |
|
Use Scenario: Supplying 3.3 V to microcontrollers and CAN transceivers in body control units powered from 12 V battery with load dump transients. IC Role / Device Role / Timing Role: Main DC/DC regulator handling wide-input (4.5–42 V) operation including cold-crank and load-dump conditions. Use Value: 42 V absolute max rating and internal current limit protect against 60 V transients; AEC-Q100 Grade 1 qualification confirmed for LM22676-Q1 variant. |
Use Scenario: Providing regulated 1.8 V or 2.5 V core voltage to ARM Cortex-M or RISC-V SoCs in edge IoT gateways. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured via FB divider to match processor VDD requirements. Use Value: 1.285 V reference enables accurate low-voltage generation; ±1.5% reference tolerance ensures stable core rail under temperature variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22678TJE-ADJ/NOPB | Same pinout, 500 kHz, but rated for 5 A output and 100 mΩ RDS(ON); higher thermal resistance (RθJA = 65°C/W). | Used where higher current headroom or margin is required; suitable for same PCB footprint with minor thermal review. | Select when 3 A margin is insufficient or future-proofing for higher loads is needed; verify thermal performance with increased copper area. |
| TPS54340DDAR | 42 V, 3.5 A, 500 kHz, but uses current-mode control and requires external compensation; no integrated bootstrap diode. | Preferred where tighter load transient response or adjustable frequency is required; demands more design effort for loop stability. | Choose when dynamic performance outweighs simplicity; avoid if minimizing design cycle time and component count is critical. |
Compared with LM22676QTJE-ADJ/NOPB, LM22678TJE-ADJ/NOPB offers higher current capability in identical packaging but slightly worse thermal performance, while TPS54340DDAR trades integration for greater control flexibility - making LM22676QTJE-ADJ/NOPB optimal for rapid, robust 3 A buck designs with minimal external parts.
Availability
LM22676QTJE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded system applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant alternatives.
Supply support for LM22676QTJE-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 LM22676QTJE-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in industrial, automotive, and communications power systems where minimal external components and fast time-to-market are critical.
FAQ
What is the minimum output voltage achievable with LM22676QTJE-ADJ/NOPB?
The LM22676QTJE-ADJ/NOPB has a nominal feedback reference voltage of 1.285 V with ±1.5% accuracy over temperature. This sets the lowest practical output voltage when the FB pin is connected directly to VOUT (i.e., no divider). Configurations below 1.285 V are not supported, as the internal error amplifier cannot regulate below its reference threshold. The LM22676QTJE-ADJ/NOPB datasheet confirms this value applies across –40°C to +125°C junction temperature.
Does LM22676QTJE-ADJ/NOPB require an external bootstrap diode?
No, LM22676QTJE-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component. The BOOT pin connects directly to the SW node through an external 10 nF ceramic capacitor, and the internal diode ensures proper charging of that capacitor during each switching cycle. This integration reduces bill-of-materials count and improves reliability compared to controllers requiring discrete bootstrap solutions.
Can LM22676QTJE-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22676QTJE-ADJ/NOPB is explicitly characterized and stabilized for use with low-ESR ceramic capacitors - a key feature highlighted in its datasheet. Unlike many older regulators requiring tantalum or electrolytic capacitors for phase margin, its internal Type III compensation works reliably with X7R/X5R MLCCs as small as 22 µF, enabling compact, high-reliability designs without lifetime derating concerns.
What is the purpose of the two NC pins on LM22676QTJE-ADJ/NOPB?
The two NC (no-connect) pins on LM22676QTJE-ADJ/NOPB - pins 7 and 8 in the HSOP-8 PowerPAD package - are not electrically bonded to the die. They serve solely as thermal conduction paths from the package body to the PCB. TI's datasheet specifies they may be left floating or connected to GND; grounding them improves thermal performance but is not required for electrical functionality. Their presence enhances heat dissipation without adding circuit complexity.
How does the enable function behave during input undervoltage conditions?
The LM22676QTJE-ADJ/NOPB features dual-stage input protection: an internal UVLO (4.3 V rising, 3.9 V falling) and a precision enable pin (1.6 V falling threshold, 0.6 V hysteresis). When VIN drops below 3.9 V, the internal UVLO forces shutdown regardless of EN state. However, for tighter control - such as preventing battery deep discharge - designers can use the EN pin with an external resistor divider to disable the LM22676QTJE-ADJ/NOPB at a custom threshold above the internal UVLO point.
LM22676QTJE-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-7 Thin
LM22676QTJE-ADJ/NOPB FAQ
1.How can I place an order for LM22676QTJE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22676QTJE-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 LM22676QTJE-ADJ/NOPB reliable?
The price and inventory of LM22676QTJE-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 LM22676QTJE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22676QTJE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22676QTJE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22676QTJE-ADJ/NOPB?
LM22676QTJE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22676QTJE-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 LM22676QTJE-ADJ/NOPB?
For technical support, including LM22676QTJE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22676QTJE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22676QTJE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22676QTJE-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 LM22676QTJE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22676QTJE-ADJ/NOPB?
All LM22676QTJE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22676QTJE-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 LM22676QTJE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22676QTJE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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