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Texas Instruments LM22674MR-ADJ/NOPB
- Part No.:
- LM22674MR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22674MR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:9,887
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Product details
Overview
LM22674MR-ADJ/NOPB from Texas Instruments is a 42 V, 500 mA adjustable-output synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package. It integrates a 200 mΩ N-channel MOSFET switch, operates at 500 kHz fixed frequency, delivers ±1.5% feedback reference accuracy (1.285 V nominal), and supports input voltages from 4.5 V to 42 V - ideal for industrial power rails converting 12 V or 24 V to 3.3 V or 5 V.
For engineers reviewing the LM22674MR-ADJ/NOPB datasheet, LM22674MR-ADJ/NOPB pinout, LM22674MR-ADJ/NOPB application, or LM22674MR-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, integrated bootstrap diode, precision enable threshold (1.6 V typ), thermal shutdown (150°C), and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22674MR-ADJ/NOPB employs a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation network is optimized for output voltages ≤5 V, enabling stable operation without external compensation components when paired with standard inductor–capacitor power stages.
It features a dedicated BOOT pin driving the high-side MOSFET gate via an external 10 nF ceramic capacitor, a precision EN pin with 0.6 V hysteresis and 6 µA internal pullup, and a fixed 500 µs soft-start duration. Minimum on-time (100 ns) and off-time (200 ns) constrain practical VIN/VOUT ratios but ensure reliable current sensing and bootstrap recharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to unregulated 12 V, 24 V, or 36 V industrial/commercial rails. |
| Output Current | Up to 500 mA - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | 500 kHz - enables compact 3.9 mm × 4.89 mm layout using small inductors (e.g., 3.3 µH–10 µH) and ceramic capacitors. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; used with external resistor divider to configure VOUT ≥1.285 V. |
| RDS(ON) | 0.24 Ω (max) - limits conduction loss at full load; contributes to >90% peak efficiency in typical 12 V → 3.3 V designs. |
| Quiescent Current | 3.4 mA (typ) - ensures low no-load power draw; standby current drops to 25 µA in shutdown mode. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and automotive-grade environments without derating up to 125°C. |
Pinout & Package
LM22674MR-ADJ/NOPB uses an HSOP-8 package with exposed thermal pad (DDA), measuring 4.89 mm × 3.90 mm. The exposed pad must be soldered to a PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 5) | Precision enable input | Active-high control: <1.6 V disables regulator (25 µA shutdown current); >2.2 V enables; 0.6 V hysteresis prevents chatter. |
| FB (Pin 4) | Feedback input | High-impedance node (230 nA bias) sensing output voltage via external resistor divider; sets regulation point at 1.285 V. |
| BOOT (Pin 1) | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; supplies gate drive for internal high-side MOSFET during switching cycle. |
| SW (Pin 8) | Switch node | Drives external inductor; swings from GND to VIN; requires low-inductance routing and Schottky catch diode (e.g., 60 V, 1 A). |
| VIN (Pin 7) | Power input | Primary DC input (4.5–42 V); requires local 10 µF ceramic input capacitor near pin for stability and EMI suppression. |
| GND (Pin 6) | System ground | Power and signal reference; connects directly to exposed thermal pad for optimal thermal performance. |
| NC (Pins 2, 3) | No connect | Thermally conductive but electrically isolated; may be left floating or tied to GND for mechanical reinforcement only. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates need for external compensation network - reduces BOM count and design iteration time for outputs ≤5 V. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode - simplifies layout and improves reliability in high-duty-cycle applications. |
| Stable with ceramic capacitors | Supports low-ESR ceramic output caps (e.g., 22 µF X5R) - avoids bulk electrolytics, improves temperature stability and lifetime. |
| Fixed 500 kHz switching | Enables predictable EMI filtering and consistent transient response - avoids variable-frequency noise spread in sensitive analog sections. |
| WEBENCH® enabled | Direct integration with TI's online design tool - auto-generates bill-of-materials, simulates efficiency/thermal performance, and validates loop stability. |
Applications
| Industrial Control Power | Telecom Board Biasing |
|---|---|
|
Use Scenario: Providing regulated 3.3 V or 5 V to PLC I/O modules, motor drivers, and fieldbus interfaces operating from 24 V DC rails. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, efficient, and thermally robust local power with UVLO protection against brownout. Use Value: Withstands 42 V transients per ISO 7637-2; maintains regulation down to 4.5 V input; eliminates need for pre-regulator LDO stages. |
Use Scenario: Generating 5 V or adjustable bias for Ethernet PHYs, SFP+ controllers, and backplane management ASICs in telecom line cards. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter supporting fast load transients and tight output tolerance (±1.5%). Use Value: 500 kHz switching enables small magnetics; internal soft-start prevents inrush into hot-swap circuits; EN pin supports sequenced power-up. |
| Embedded System Core Supply | Automotive Body Electronics |
|
Use Scenario: Powering ARM Cortex-M microcontrollers, FPGAs, and ADCs in portable test equipment and edge IoT gateways. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured for 1.8 V, 2.5 V, or 3.3 V core logic rails with precise feedback reference. Use Value: 1.285 V reference enables accurate low-voltage generation; ±1.5% VREF ensures ADC reference stability and MCU clock integrity. |
Use Scenario: Supplying 5 V to infotainment displays, LED lighting controllers, and body control modules fed from 12 V battery with load dump immunity. IC Role / Device Role / Timing Role: Robust DC/DC stage meeting AEC-Q100 Grade 1 requirements (–40°C to +125°C junction). Use Value: Thermal shutdown (150°C) and current limit (0.84 A typ) protect against sustained overloads; SO PowerPAD enhances heat dissipation in confined enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MR-ADJ/NOPB | Lower 3 V min input, 300 mA output, 650 kHz fSW; no integrated bootstrap diode. | Better suited for low-input, space-constrained 3.3 V systems; requires external bootstrap diode and higher-ESR output caps. | Select when input is limited to 3–20 V and thermal budget allows lower current capability. |
| TPS54302DDCR | 4.5–28 V input, 3 A output, 2.1 MHz fSW, integrated high-/low-side FETs; no BOOT pin. | Higher current, faster transient response; requires different layout and compensation due to current-mode control. | Choose for applications needing >500 mA or tighter output regulation under dynamic loads. |
Compared with LM22674MR-ADJ/NOPB, LM22670MR-ADJ/NOPB trades input voltage range and integration for smaller footprint and lower quiescent current, while TPS54302DDCR offers higher current and frequency at the cost of increased complexity and reduced 42 V surge tolerance.
Availability
LM22674MR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded system designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM22674MR-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 LM22674MR-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in industrial, automotive, and communications applications where minimal external components and rapid design-in are critical.
FAQ
What is the minimum output voltage achievable with LM22674MR-ADJ/NOPB?
The LM22674MR-ADJ/NOPB has a nominal feedback reference voltage of 1.285 V with ±1.5% tolerance. When configured in adjustable mode, this sets the lowest possible output voltage - meaning VOUT cannot be set below approximately 1.266 V (min spec). Output voltages above this value are set using an external resistor divider connected between VOUT, FB, and GND. The LM22674MR-ADJ/NOPB does not support sub-1.266 V outputs.
Does LM22674MR-ADJ/NOPB require an external bootstrap diode?
No, the LM22674MR-ADJ/NOPB integrates a bootstrap diode internally. This eliminates the need for an external diode between BOOT and SW pins - simplifying layout and improving reliability. Only a 10 nF ceramic capacitor is required between BOOT and SW to complete the bootstrap circuit. External diodes are unnecessary and may interfere with proper gate drive operation.
Can LM22674MR-ADJ/NOPB operate with ceramic output capacitors only?
Yes, the LM22674MR-ADJ/NOPB is explicitly designed to be stable with low-ESR ceramic output capacitors - a key feature highlighted in its datasheet. It does not require aluminum or tantalum electrolytics. Typical designs use 10–47 µF X5R/X7R ceramics placed close to the FB and SW pins. This improves long-term reliability, temperature stability, and reduces board area versus traditional solutions.
What is the purpose of the NC pins (2 and 3) on LM22674MR-ADJ/NOPB?
Pins 2 and 3 of the LM22674MR-ADJ/NOPB are designated No Connect (NC) - they are not electrically bonded to the die. However, they serve a thermal function: their metal leads conduct heat from the package body to the PCB. They may be left floating or connected to the GND copper pour to enhance thermal dissipation, but must never be routed to active signals or voltage planes other than GND.
How does the enable pin (EN) behave during power-up sequencing?
The LM22674MR-ADJ/NOPB EN pin features a precision threshold (1.6 V typ) with 0.6 V hysteresis and a 6 µA internal pullup. During power-up, the regulator remains disabled until EN rises above ~2.2 V; once enabled, it stays on until EN falls below ~1.6 V. This behavior allows clean sequencing with resistor dividers from upstream rails and prevents false turn-on during slow-rising inputs - a critical capability in multi-rail systems using LM22674MR-ADJ/NOPB.
LM22674MR-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 500mA
- 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
LM22674MR-ADJ/NOPB FAQ
1.How can I place an order for LM22674MR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22674MR-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 LM22674MR-ADJ/NOPB reliable?
The price and inventory of LM22674MR-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 LM22674MR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22674MR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22674MR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22674MR-ADJ/NOPB?
LM22674MR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22674MR-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 LM22674MR-ADJ/NOPB?
For technical support, including LM22674MR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22674MR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22674MR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22674MR-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 LM22674MR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22674MR-ADJ/NOPB?
All LM22674MR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22674MR-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 LM22674MR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22674MR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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