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Texas Instruments LM22674QMR-ADJ/NOPB
- Part No.:
- LM22674QMR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22674QMR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM22674QMR-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 down to 1.285 V output, and supports industrial temperature range (–40°C to +125°C). It is used in distributed power rails for telecom and embedded systems requiring high input voltage tolerance and low quiescent current.
For engineers reviewing the LM22674QMR-ADJ/NOPB datasheet, LM22674QMR-ADJ/NOPB pinout, LM22674QMR-ADJ/NOPB application, or LM22674QMR-ADJ/NOPB equivalent, key selection criteria include its 4.5–42 V input range, internal compensation for outputs ≤5 V, integrated bootstrap diode, precision enable threshold (1.6 V typ), and thermal shutdown at 150°C - all critical for robust 24 V/48 V system designs.
Technical Context
The LM22674QMR-ADJ/NOPB implements voltage-mode PWM control with input voltage feedforward to stabilize loop gain across wide VIN variations. Its internal Type III compensation network is optimized for output voltages up to 5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It features a precision enable input with 0.6 V hysteresis and 6 µA pullup, supporting controlled power sequencing; integrated soft-start (500 µs typ) limits inrush current; and a dedicated BOOT pin driving the high-side MOSFET gate via an external 10 nF capacitor. Thermal shutdown activates at 150°C with automatic recovery at ~135°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 24 V/36 V/48 V industrial and automotive supply rails without pre-regulation. |
| Output Current | 500 mA max - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained applications. |
| Switching Frequency | 500 kHz (±20%) - enables use of small inductors (e.g., 3.3–10 µH) and reduces output ripple while maintaining good transient response. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; allows precise regulation of 1.8 V, 2.5 V, 3.3 V, or 5 V rails using external resistor divider. |
| RDS(ON) | 200 mΩ (typ) - minimizes conduction loss at full load, contributing to >90% peak efficiency in typical 12 V → 3.3 V designs. |
| Quiescent Current | 3.4 mA (typ) - ensures low no-load power draw in always-on subsystems; drops to 25 µA in shutdown mode. |
| Operating Junction Temp | –40°C to +125°C - qualified for harsh environments including industrial control cabinets and under-hood automotive modules. |
Pinout & Package
LM22674QMR-ADJ/NOPB uses an 8-pin HSOP package (4.89 mm × 3.90 mm) with exposed PowerPAD thermally connected to PCB ground for enhanced thermal dissipation (RθJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOT | Bootstrap supply node | Connects external 10 nF ceramic capacitor between BOOT and SW to generate gate drive voltage for internal high-side MOSFET. |
| 2,3: NC | No-connect terminals | Thermally conductive but electrically isolated; must remain unconnected per datasheet - not usable as grounds or signals. |
| 4: FB | Feedback input | High-impedance (230 nA bias) node sensing output voltage via resistor divider; placement near output capacitor is critical for noise immunity. |
| 5: EN | Enable control input | Logic-compatible input with 1.6 V turn-on threshold and 0.6 V hysteresis; internal 6 µA pullup allows direct tie to VIN via resistor for UVLO implementation. |
| 6: GND | Power and signal ground | Main return path for switch current and control circuitry; must be low-impedance and tied directly to exposed PowerPAD. |
| 7: VIN | Main input supply | Accepts 4.5–42 V DC; requires local 10 µF ceramic input capacitor placed close to VIN and GND pins. |
| 8: SW | Switch node | Drives external inductor; swings from ~0 V to VIN; requires tight layout with minimal trace length to reduce EMI and switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - simplifies design and validation for 1.285 V to 5 V outputs. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode, reducing BOM count and PCB area in high-side gate drive path. |
| Stable with ceramic output capacitors | Supports low-ESR X5R/X7R MLCCs (e.g., 22 µF) - avoids bulkier, less reliable electrolytic or tantalum alternatives. |
| 500 µs internal soft-start | Prevents output overshoot and inrush current during power-up; resets automatically on enable toggle or thermal shutdown. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications operating from –40°C to +125°C junction temperature with robust HBM ESD rating (±2 kV). |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering isolated CAN transceivers, analog sensor front-ends, and digital I/O drivers from a 24 V rail in factory automation equipment. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 3.3 V or 5 V local supply; handles line transients up to 42 V and operates continuously at 85°C ambient. Use Value: Internal 200 mΩ MOSFET and 500 kHz switching enable compact, efficient conversion without external gate driver or compensation parts. |
Use Scenario: Supplying microcontroller core voltage and peripheral logic in door module or lighting control unit powered by vehicle battery (9–16 V nominal, up to 42 V load dump). IC Role / Device Role / Timing Role: Adjustable-output DC/DC converter with precision enable for controlled power sequencing during ignition cycle; withstands cold-crank and load-dump conditions. Use Value: AEC-Q100 Grade 1 qualification, –40°C to +125°C operation, and 25 µA shutdown current ensure reliability and low standby drain in automotive environments. |
| Telecom Remote Radio Unit | Embedded Medical Sensor Hub |
|
Use Scenario: Converting 48 V backplane voltage to 1.8 V/3.3 V rails for FPGAs, ADCs, and RF front-end ICs in outdoor base station equipment. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator with fast transient response; maintains regulation during burst-mode data transmission current spikes. Use Value: 500 kHz fixed frequency and internal compensation allow predictable EMI filtering and rapid design iteration using TI WEBENCH®. |
Use Scenario: Providing clean, low-noise 2.5 V and 3.3 V supplies for precision analog front-ends and wireless SoCs in portable diagnostic devices. IC Role / Device Role / Timing Role: Efficient, low-quiescent-current buck converter operating from single-cell Li-ion (3.0–4.2 V) or dual-cell configurations (6–8.4 V) with adjustable output. Use Value: ±1.5% reference accuracy and stable ceramic-capacitor operation ensure consistent sensor measurement integrity across battery discharge profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670QMR-ADJ/NOPB | Lower 3 V min input, 300 kHz switching frequency, same 500 mA rating and HSOP-8 package. | Better suited for low-input-voltage systems (e.g., 5 V bus); less optimal for 24 V/48 V inputs due to reduced max duty cycle. | Select when input voltage stays below 20 V and lower EMI priority justifies slower switching. |
| TPS54302DDCR | 4.5–28 V input, 3 A output, 500 kHz, integrated high-/low-side MOSFETs, no BOOT pin required. | Higher current capability and simpler layout (no external diode), but lacks 42 V input rating and AEC-Q100 qualification. | Choose for cost-sensitive, higher-current non-automotive applications where 28 V max input is acceptable. |
Compared with LM22670QMR-ADJ/NOPB, LM22674QMR-ADJ/NOPB provides wider input range and faster switching for better size-efficiency trade-off in 24 V+ systems; versus TPS54302DDCR, it offers automotive qualification and 42 V tolerance at the expense of output current headroom.
Availability
LM22674QMR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and telecom power conversion requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LM22674QMR-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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, performance, and design enablement tools.
The LM22674QMR-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in high-voltage DC/DC conversion with minimal external components and full WEBENCH® design integration.
FAQ
What is the minimum output voltage achievable with LM22674QMR-ADJ/NOPB?
The LM22674QMR-ADJ/NOPB has a feedback reference voltage of 1.285 V (typ), which sets the lowest possible regulated output voltage. When configured with appropriate resistor divider values (e.g., RFBB = 976 Ω, RFBT = 1.54 kΩ), it reliably delivers 3.3 V or 5 V outputs. Output voltages below 1.285 V are not supported, as the internal error amplifier cannot regulate below its reference threshold.
Does LM22674QMR-ADJ/NOPB require an external bootstrap diode?
No, LM22674QMR-ADJ/NOPB integrates a bootstrap diode internally. Only an external 10 nF ceramic capacitor between BOOT and SW pins is required to complete the high-side gate drive circuit. This eliminates one discrete component, reduces layout complexity, and improves reliability compared to controllers requiring external bootstrap diodes.
Can LM22674QMR-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22674QMR-ADJ/NOPB is explicitly characterized and stabilized for use with low-ESR ceramic capacitors (e.g., 22 µF X5R/X7R MLCCs). Its internal Type III compensation and voltage-mode architecture eliminate the need for high-ESR electrolytic or tantalum capacitors - simplifying design, improving lifetime, and reducing board area.
What is the purpose of the NC pins (pins 2 and 3) on LM22674QMR-ADJ/NOPB?
Pins 2 and 3 on LM22674QMR-ADJ/NOPB are true no-connect (NC) terminals - electrically isolated from the die but thermally conductive. They must remain unconnected in the schematic and layout. Their function is purely thermal: they enhance heat transfer from the package body to the PCB, improving power dissipation without introducing signal or power paths.
How does the enable pin (EN) of LM22674QMR-ADJ/NOPB behave during power sequencing?
The EN pin of LM22674QMR-ADJ/NOPB features a precision 1.6 V (typ) turn-on threshold with 0.6 V hysteresis and internal 6 µA pullup current. This allows direct connection to upstream rails (e.g., via resistor divider from 5 V or 12 V supply) for controlled startup/shutdown sequencing. Pulling EN below 1.3 V disables the regulator, reducing quiescent current to 25 µA (typ).
LM22674QMR-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22674QMR-ADJ/NOPB FAQ
1.How can I place an order for LM22674QMR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22674QMR-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 LM22674QMR-ADJ/NOPB reliable?
The price and inventory of LM22674QMR-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 LM22674QMR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22674QMR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22674QMR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22674QMR-ADJ/NOPB?
LM22674QMR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22674QMR-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 LM22674QMR-ADJ/NOPB?
For technical support, including LM22674QMR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22674QMR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22674QMR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22674QMR-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 LM22674QMR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22674QMR-ADJ/NOPB?
All LM22674QMR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22674QMR-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 LM22674QMR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22674QMR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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