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Texas Instruments LM22670MRX-ADJ/NOPB
- Part No.:
- LM22670MRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22670MRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,426
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Product details
Overview
LM22670MRX-ADJ/NOPB from Texas Instruments is a 42-V, 3-A synchronous step-down DC/DC regulator in HSOP-8 PowerPAD™ package, featuring voltage-mode PWM control, internal loop compensation, and adjustable output down to 1.285 V. It delivers >90% efficiency at full load with 500-kHz default switching frequency and supports industrial power rails (24 V, 12 V) in space-constrained embedded systems.
For engineers reviewing the LM22670MRX-ADJ/NOPB datasheet, LM22670MRX-ADJ/NOPB pinout, LM22670MRX-ADJ/NOPB application, or LM22670MRX-ADJ/NOPB equivalent, key selection criteria include its 4.5–42 V input range, ±1.5% feedback reference accuracy, integrated bootstrap diode, thermal shutdown protection, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22670MRX-ADJ/NOPB implements a voltage-mode constant-frequency PWM architecture with input voltage feedforward for stable loop gain across wide VIN variations. Its internal Type III compensation is optimized for output voltages ≤5 V, enabling stable operation without external compensation components.
It integrates a 120-mΩ N-channel MOSFET switch, precision enable input with 1.6 V threshold and 0.6 V hysteresis, and a dedicated RT/SYNC pin supporting three modes: internal 500-kHz oscillator, resistor-adjustable 200 kHz–1 MHz, or external clock synchronization - though frequency adjustment and sync cannot operate simultaneously.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial and automotive supply rails without pre-regulation. |
| Output Current | Up to 3 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor subsystems. |
| Feedback Reference | 1.285 V (typ), ±1.5% - enables precise adjustable output from 1.285 V upward using external resistor divider. |
| Switching Frequency | 500 kHz (default), adjustable 200 kHz–1 MHz - balances EMI, component size, and transient response. |
| RDS(ON) | 120 mΩ (PFM package) - reduces conduction loss and thermal stress at full load. |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - minimizes standby power in always-on systems. |
| Thermal Shutdown | 150 °C - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM22670MRX-ADJ/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad connected to GND for enhanced heat dissipation. The 8-pin layout supports compact, high-power-density buck converter designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node Output | Drives external inductor; swings between ~0 V and VIN; requires low-inductance layout to minimize ringing. |
| 2 VIN | Main Input Supply | Accepts 4.5–42 V; connects to bulk input capacitor and must be decoupled near the pin. |
| 3 BOOT | Bootstrap Supply | Connects to SW via 10-nF ceramic capacitor; powers high-side gate driver; requires short, wide traces. |
| 4 GND | Power Ground | System ground reference; ties to exposed pad for thermal and electrical integrity. |
| 5 RT/SYNC | Oscillator Control | Selects operating mode: floating = 500 kHz, resistor-to-GND = adjustable freq., external clock = sync mode. |
| 6 FB | Feedback Input | Senses output voltage via resistor divider; sets regulated VOUT = 1.285 V × (1 + R1/R2). |
| 7 EN | Enable Input | Logic-level ON/OFF control; 1.6 V threshold with 0.6 V hysteresis; internal 6-µA pullup allows direct VIN tie. |
| 8 EP (Exposed Pad) | Thermal & Electrical Ground | Mandatory connection to PCB GND plane; primary thermal path; improves power handling and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Control Loop | 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. |
| Adjustable Switching Frequency | 200 kHz–1 MHz tuning via single RT resistor - enables EMI band avoidance and optimization of inductor/capacitor size. |
| Precision Enable with UVLO | 1.6 V enable threshold + 0.6 V hysteresis + independent 4.3 V/3.9 V UVLO - supports robust power sequencing and battery discharge protection. |
| Soft-Start | Fixed 500 µs ramp - prevents inrush current and output overshoot during startup without external timing components. |
Applications
| Industrial Motor Drives | Telecom Line Cards |
|---|---|
|
Use Scenario: Powering gate drivers, isolated ADCs, and digital I/O in 24-V PLC modules with strict thermal constraints. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering 3.3 V/3 A from 24-V rail; regulates voltage under fast load transients from motor commutation noise. Use Value: 120-mΩ RDS(ON) and 500-kHz switching minimize thermal rise on 2-layer PCBs; integrated soft-start prevents false triggering of downstream logic. |
Use Scenario: Generating 1.8 V and 3.3 V supplies for SERDES and PHY ICs on telecom line cards powered from -48 V nominal bus. IC Role / Device Role / Timing Role: Secondary-stage buck regulator accepting intermediate 12-V or 5-V rail; provides tightly regulated low-noise core voltage. Use Value: ±1.5% feedback accuracy ensures compliance with SERDES VCC tolerance; 500-µs soft-start prevents data corruption during hot-swap insertion. |
| Automotive Body Control Modules | Medical Portable Diagnostics |
|
Use Scenario: Converting 12-V battery supply to 5 V for microcontrollers and CAN transceivers in BCMs with cold-crank (6-V) and load-dump (42-V) conditions. IC Role / Device Role / Timing Role: Main system regulator with wide-input capability; withstands automotive transients while maintaining regulation. Use Value: 4.5–42 V input range covers full automotive operating envelope; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Use Scenario: Powering low-power ARM Cortex-M processors and analog front-ends in handheld ultrasound or glucose meters running from Li-ion batteries. IC Role / Device Role / Timing Role: Efficient step-down converter from 3.6–4.2 V battery to 1.2 V core and 3.3 V peripherals; operates across full battery discharge curve. Use Value: 25 µA shutdown current extends battery life in sleep mode; adjustable output supports multiple voltage domains from single 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 |
|---|---|---|---|
| LM22671MRX-ADJ/NOPB | Same pinout, 500-kHz fixed frequency only (no RT/SYNC adjust/sync); 100-mΩ RDS(ON) in SO PowerPAD-8. | Lacks frequency tuning - suitable where EMI profile is fixed and layout space permits larger inductors. | Choose when simplicity and lower conduction loss outweigh need for frequency flexibility. |
| TPS54340DDAR | 42-V, 3.5-A, adjustable freq. 100 kHz–2.5 MHz; no integrated bootstrap diode; requires external bootstrap diode. | Higher max current and wider freq. range but adds BOM complexity and layout sensitivity. | Prefer when >3 A load or >1 MHz switching is required, and design team can manage external bootstrap routing. |
Compared with LM22670MRX-ADJ/NOPB, LM22671MRX-ADJ/NOPB offers lower RDS(ON) but sacrifices frequency adjustability, while TPS54340DDAR extends current and frequency range at the cost of added external components and layout effort.
Availability
LM22670MRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, telecom line cards, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability assurance.
Supply support for LM22670MRX-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 power conversion solutions.
The LM22670MRX-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 supported by the LM22670MRX-ADJ/NOPB?
The LM22670MRX-ADJ/NOPB supports a minimum output voltage of 1.285 V (typical feedback reference voltage). This value is specified over temperature (–40°C to +125°C) with ±1.5% accuracy. Output voltage is set externally using a resistor divider from VOUT to FB and from FB to GND, per the equation VOUT = 1.285 V × (1 + R1/R2). The LM22670MRX-ADJ/NOPB cannot regulate below this reference voltage.
Does the LM22670MRX-ADJ/NOPB require an external bootstrap diode?
No, the LM22670MRX-ADJ/NOPB integrates a bootstrap diode internally. This eliminates the need for an external diode in the bootstrap circuit between the BOOT and SW pins. A 10-nF ceramic capacitor must still be placed directly between BOOT and SW with minimal trace length to ensure reliable high-side gate drive operation.
Can the LM22670MRX-ADJ/NOPB synchronize to an external clock?
Yes, the LM22670MRX-ADJ/NOPB supports external clock synchronization via the RT/SYNC pin. When an external clock signal (1.75 V threshold, rising-edge triggered) between 500 kHz and 1 MHz is applied, the device synchronizes to that clock. Synchronization is latched at startup and reverts to the internal 500-kHz oscillator if the external clock is lost during operation.
What is the thermal resistance (RθJA) of the LM22670MRX-ADJ/NOPB in its HSOP-8 PowerPAD™ package?
The LM22670MRX-ADJ/NOPB in HSOP-8 PowerPAD™ package has a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 square inch of 2-oz copper. Actual RθJA varies between 42°C/W and 115°C/W depending on PCB copper area and thermal vias under the exposed pad. For reliable 3-A operation, thermal design must ensure junction temperature remains ≤125°C under worst-case ambient and load conditions.
How does the enable (EN) pin function on the LM22670MRX-ADJ/NOPB?
The EN pin on the LM22670MRX-ADJ/NOPB provides precision ON/OFF control with a 1.6 V (typ) threshold and 0.6 V (typ) hysteresis. Pulling EN below 1.6 V disables the regulator, reducing quiescent current to 25 µA (typ). An internal 6-µA pullup allows direct connection to VIN via a current-limiting resistor (e.g., 470 kΩ for 42-V input). EN also supports external undervoltage lockout when used with a resistor divider.
LM22670MRX-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
LM22670MRX-ADJ/NOPB FAQ
1.How can I place an order for LM22670MRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22670MRX-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 LM22670MRX-ADJ/NOPB reliable?
The price and inventory of LM22670MRX-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 LM22670MRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22670MRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22670MRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22670MRX-ADJ/NOPB?
LM22670MRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22670MRX-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 LM22670MRX-ADJ/NOPB?
For technical support, including LM22670MRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22670MRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22670MRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22670MRX-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 LM22670MRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22670MRX-ADJ/NOPB?
All LM22670MRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22670MRX-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 LM22670MRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22670MRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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