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Texas Instruments LM22670MR-ADJ/NOPB
- Part No.:
- LM22670MR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22670MR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,734
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Product details
Overview
LM22670MR-ADJ/NOPB from Texas Instruments is a 42-V, 3-A synchronous step-down DC/DC regulator in HSOP-8 PowerPAD™ package, featuring adjustable output (as low as 1.285 V), 500-kHz default switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode - used in industrial power rails converting 24-V/12-V inputs to sub-5-V logic supplies.
For engineers reviewing the LM22670MR-ADJ/NOPB datasheet, LM22670MR-ADJ/NOPB pinout, LM22670MR-ADJ/NOPB application, or LM22670MR-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance with exposed pad, soft-start timing (500 µs), enable threshold hysteresis (0.6 V), and RT/SYNC pin configurability for frequency adjustment or synchronization.
Technical Context
The LM22670MR-ADJ/NOPB implements voltage-mode PWM control with input voltage feedforward to stabilize loop gain across wide VIN variations, enabling optimized transient response without external compensation. Its internal Type III compensator is tuned for outputs ≤5 V and supports ceramic output capacitors with low ESR.
It integrates a 120-mΩ N-channel MOSFET switch (PFM package), precision enable with 1.6-V turn-on threshold and 0.6-V hysteresis, and a self-contained soft-start circuit that ramps output over 500 µs. The BOOT–SW bootstrap supply requires a 10-nF ceramic capacitor and mandates ≥5 mA minimum load for reliable gate drive recharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to unregulated 24-V industrial or automotive rails without pre-regulation. |
| Output Current | Up to 3 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or multi-rail embedded systems. |
| Feedback Reference | 1.285 V (typ), ±1.5% - sets minimum adjustable output; enables precise 3.3-V, 2.5-V, or 1.8-V generation with external resistor divider. |
| Switching Frequency | 500 kHz (default), adjustable 200 kHz–1 MHz via RT/SYNC resistor - balances efficiency, EMI, and component size in space-constrained designs. |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - enables low-power standby modes in battery-backed or always-on systems. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature environments without derating at full load. |
| RDS(ON) | 120 mΩ (PFM package) - limits conduction loss to <360 mW at 3 A, supporting >90% peak efficiency at mid-load. |
Pinout & Package
LM22670MR-ADJ/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with an exposed thermal pad electrically and thermally connected to GND - requires PCB copper area ≥1 in² for RθJA = 60°C/W operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node | High-current drain of internal N-MOSFET; connects to inductor and bootstrap capacitor; swings from ~0 V to VIN. |
| 2 VIN | Power input | Main supply input (4.5–42 V); decoupled with ≥10 µF ceramic capacitor near pin; powers internal LDO and gate driver. |
| 3 BOOT | Bootstrap supply | Connects to SW via 10-nF ceramic capacitor; provides floating gate drive voltage for high-side MOSFET. |
| 4 GND | Power ground | Analog and power ground reference; tied to exposed pad; must be low-impedance plane for noise and thermal management. |
| 5 RT/SYNC | Oscillator control | Configures frequency mode: floating = 500 kHz; resistor-to-GND = 200 kHz–1 MHz; external clock = sync mode (≥500 kHz). |
| 6 FB | Feedback input | Senses output via resistive divider; internal 1.285-V reference compares against divider ratio to regulate VOUT. |
| 7 EN | Enable control | Logic-level ON/OFF: <1.6 V disables regulator (25 µA IQ); >2.2 V enables; 0.6-V hysteresis prevents chatter during sequencing. |
| 8 NC | No connect | Not internally bonded; must remain unconnected per datasheet - no routing or soldering allowed. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - reduces BOM count and layout sensitivity for 3-A buck designs. |
| Integrated bootstrap diode | Removes external Schottky diode requirement - simplifies layout, improves reliability, and reduces footprint in HSOP-8. |
| Adjustable switching frequency & sync capability | Enables EMI spread-spectrum tuning or system-level clock alignment without changing inductor/capacitor values. |
| Precision enable with UVLO support | Allows controlled power sequencing and external undervoltage lockout using resistor divider - avoids brownout operation. |
| Thermal shutdown & current limiting | Protects against sustained overload or PCB thermal failure - latches off or folds back frequency depending on fault severity. |
Applications
| Industrial PLC Power Supply | Telecom Line Card Biasing |
|---|---|
|
Use Scenario: Converting 24-V field bus input to regulated 3.3-V/1.8-V rails for programmable logic controllers with real-time I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3-A continuous current; manages dynamic load steps from digital I/O switching. Use Value: Wide 4.5–42-V input range accommodates 24-V nominal with ±20% ripple; 125°C junction rating ensures reliability in enclosed cabinets. |
Use Scenario: Generating isolated 5-V and 3.3-V bias voltages on telecom line cards powered from –48-V DC distribution. IC Role / Device Role / Timing Role: Secondary-side non-isolated buck converter after front-end flyback; regulates auxiliary logic and interface ICs. Use Value: 500-kHz switching enables compact 2.2-µH inductors; ±1.5% VFB accuracy maintains tight tolerance under temperature and load variation. |
| Embedded System Core Rail | Automotive Body Control Module |
|
Use Scenario: Providing stable 1.2-V core supply for ARM Cortex-M7 microcontrollers in edge AI gateways with variable processing loads. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with soft-start (500 µs) to prevent inrush into large output capacitance banks. Use Value: 1.285-V reference allows precise 1.2-V generation via resistor divider; internal compensation ensures stability with low-ESR ceramic caps. |
Use Scenario: Powering CAN transceivers and sensor interfaces in body control units supplied from 12-V battery with cold-crank dips. IC Role / Device Role / Timing Role: Input-robust buck regulator maintaining 5-V output during 4.5-V brownout events; enabled via vehicle ignition signal. Use Value: Precision enable (1.6-V threshold, 0.6-V hysteresis) enables clean start-up sequencing; UVLO fallback prevents erratic MCU reset behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22671MR-ADJ/NOPB | Same pinout, 5-A output rating, higher RDS(ON) (100 mΩ SO PowerPAD-8 vs 120 mΩ HSOP-8), identical control features. | Better suited for higher-current loads (>3 A) where thermal margin is critical; requires larger inductor and output cap sizing. | Select when future-proofing for 4–5 A loads or when board layout allows SO PowerPAD-8 thermal pad expansion. |
| TPS54340DDAR | 42-V, 3.5-A buck with current-mode control, 100-mΩ RDS(ON), adjustable soft-start, but no integrated bootstrap diode. | Requires external bootstrap diode and external compensation; offers faster transient response but higher design complexity. | Prefer when tighter load regulation or faster line/load transients are required, and additional BOM/layout effort is acceptable. |
Compared with LM22670MR-ADJ/NOPB, LM22671MR-ADJ/NOPB delivers higher current headroom in identical footprint, while TPS54340DDAR trades integration for control flexibility - making LM22670MR-ADJ/NOPB optimal for cost-sensitive, space-constrained 3-A industrial buck designs requiring minimal external components.
Availability
LM22670MR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded system core rail applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM22670MR-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 LM22670MR-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in industrial, telecom, and automotive power systems where minimal external components and fast time-to-market are critical.
FAQ
What is the minimum output voltage supported by the LM22670MR-ADJ/NOPB?
The LM22670MR-ADJ/NOPB supports a minimum output voltage equal to its internal feedback reference voltage of 1.285 V (typical), with ±1.5% accuracy over temperature and line. This value is specified in the Electrical Characteristics table for the -ADJ version under VFB. Output voltages below 1.285 V cannot be regulated, and the device requires an external resistor divider between VOUT and FB to set any adjustable output above this threshold.
Does the LM22670MR-ADJ/NOPB require an external bootstrap diode?
No, the LM22670MR-ADJ/NOPB integrates a bootstrap diode internally - eliminating the need for an external Schottky diode between BOOT and SW. This is explicitly stated in the Features list and confirmed in Section 7.3.5 of the datasheet. Only a 10-nF ceramic capacitor is required between BOOT and SW, placed with short, low-inductance traces.
Can the LM22670MR-ADJ/NOPB synchronize to an external clock?
Yes, the LM22670MR-ADJ/NOPB can synchronize to an external clock applied to the RT/SYNC pin, provided the clock frequency is between 500 kHz and 1 MHz, has valid logic levels (VSYNC thresholds: 1.75 V min high, falling edge detection), and is present during startup. Synchronization mode is latched until EN or VIN is cycled, and the regulator reverts to 500 kHz if the external clock is lost.
What thermal considerations apply to the LM22670MR-ADJ/NOPB in HSOP-8 PowerPAD™ package?
The LM22670MR-ADJ/NOPB in HSOP-8 PowerPAD™ has a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 in² of 2-oz copper. To maintain safe operation at 3-A load, PCB layout must maximize thermal pad copper area and use multiple thermal vias to inner/ground planes. Derating is required above 85°C ambient unless enhanced cooling is implemented.
Is the LM22670MR-ADJ/NOPB pin-compatible with the LM22670-5.0 variants?
Yes, all LM22670 variants including LM22670MR-ADJ/NOPB and LM22670MR-5.0/NOPB share identical HSOP-8 PowerPAD™ pinout and package dimensions. The only functional difference is the feedback configuration: -ADJ uses external resistor divider on FB, while -5.0 internally fixes VOUT to 5 V. No PCB changes are needed when substituting between these versions.
LM22670MR-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:
- 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
LM22670MR-ADJ/NOPB FAQ
1.How can I place an order for LM22670MR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22670MR-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 LM22670MR-ADJ/NOPB reliable?
The price and inventory of LM22670MR-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 LM22670MR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22670MR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22670MR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22670MR-ADJ/NOPB?
LM22670MR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22670MR-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 LM22670MR-ADJ/NOPB?
For technical support, including LM22670MR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22670MR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22670MR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22670MR-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 LM22670MR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22670MR-ADJ/NOPB?
All LM22670MR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22670MR-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 LM22670MR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22670MR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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