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Texas Instruments LM22670MRE-ADJ/NOPB
- Part No.:
- LM22670MRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22670MRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:703
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Product details
Overview
LM22670MRE-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 integrates a 120-mΩ N-channel MOSFET switch, supports 500-kHz default switching frequency (adjustable 200 kHz–1 MHz), and delivers >90% efficiency in industrial power rails.
For engineers reviewing the LM22670MRE-ADJ/NOPB datasheet, LM22670MRE-ADJ/NOPB pinout, LM22670MRE-ADJ/NOPB application, or LM22670MRE-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), feedback reference accuracy (±1.5%), thermal performance (RθJA = 60°C/W), and soft-start timing (500 µs typical).
Technical Context
The LM22670MRE-ADJ/NOPB implements a voltage-mode PWM architecture with input voltage feedforward to stabilize loop gain across input variations. Its internal Type III compensation is optimized for output voltages ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It features a precision enable input (1.6 V threshold, 0.6 V hysteresis), integrated bootstrap diode, and self-synchronizable RT/SYNC pin supporting three modes: internal 500-kHz oscillator, resistor-adjusted frequency (200 kHz–1 MHz), or external clock synchronization (up to 1 MHz). Current limit foldback disables when synchronized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial and automotive supply rails including 24-V, 12-V, and 5-V inputs. |
| Output Current | Up to 3 A - sustained load capability enabled by 120-mΩ internal N-channel MOSFET and exposed thermal pad. |
| Feedback Reference | 1.285 V (typ), ±1.5% - sets minimum adjustable output; enables precise regulation of 3.3-V, 2.5-V, or custom rails. |
| Switching Frequency | 500 kHz (default), adjustable 200 kHz–1 MHz - balances EMI, component size, and transient response. |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - minimizes standby power loss in always-on systems. |
| Thermal Resistance | RθJA = 60°C/W (HSOP-8 with 1-in² copper) - requires PCB thermal relief design for full 3-A operation at 125°C junction. |
| Soft-Start Time | 500 µs (fixed) - prevents inrush current and output overshoot during power-up without external components. |
Pinout & Package
LM22670MRE-ADJ/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with an exposed thermal pad that must be soldered to a GND plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOT | Bootstrap capacitor connection | Provides gate drive voltage for high-side MOSFET; requires 10-nF ceramic cap between BOOT and SW with low-inductance layout. |
| 2 - VIN | Main input supply | Accepts 4.5–42 V; powers internal circuitry and high-side driver; decoupling capacitor required near this pin. |
| 3 - SW | Switch node | Drives external inductor; swings from ~0 V to VIN; high dv/dt node requiring tight layout and ground shielding. |
| 4 - GND | Power and signal ground | Common return for internal circuits, feedback, and EN; must connect directly to exposed pad and system ground plane. |
| 5 - RT/SYNC | Oscillator control | Selects operating mode: floating = 500 kHz, resistor-to-GND = adjustable frequency, external clock = synchronization. |
| 6 - FB | Feedback input | Senses output via resistive divider; regulates output to 1.285 V reference; bias current 230 nA enables high-resistor dividers. |
| 7 - EN | Enable control | Logic-level ON/OFF control with 1.6 V threshold and 0.6 V hysteresis; internal 6-µA pullup allows direct VIN tie with 470-kΩ resistor. |
| 8 - EP (Exposed Pad) | Thermal & electrical ground | Must be soldered to ≥1-in² copper area connected to GND; primary path for heat dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network; simplifies design for outputs ≤5 V while maintaining stability with ceramic output caps. |
| Integrated bootstrap diode | Removes external diode requirement in boot circuit, reducing BOM count and layout complexity for high-side gate drive. |
| Precision enable with UVLO | Enables reliable power sequencing and external undervoltage lockout (rising threshold 4.3 V) to prevent brownout operation. |
| Adjustable + synchronizable switching frequency | Supports EMI-sensitive designs via frequency tuning or system-wide clock alignment-critical for multi-rail embedded systems. |
| Thermal shutdown + current limiting | Protects against overload and overtemperature faults; current limit set at 3.4–5.3 A (typ/max) with foldback during short-circuit. |
Applications
| Industrial Control Power Supply | Telecom Intermediate Bus Converter |
|---|---|
|
Use Scenario: Regulating 24-V or 48-V backplane to 3.3-V/2.5-V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated low-voltage rails with high PSRR and fast load transient response. Use Value: Wide 4.5–42-V input accommodates fluctuating industrial bus voltages; 3-A capability supports multiple downstream LDOs or FPGAs. |
Use Scenario: Converting -48-V telecom rectified input to 12-V intermediate bus in access equipment. IC Role / Device Role / Timing Role: High-efficiency step-down stage before point-of-load converters; operates in forced PWM mode under light loads. Use Value: 42-V absolute max rating ensures margin against line transients; 500-kHz switching enables compact magnetics and low-profile inductors. |
| Automotive Body Control Module (BCM) | Embedded System Point-of-Load Regulator |
|
Use Scenario: Generating 5-V and 3.3-V supplies from 12-V battery rail in infotainment head units and gateway ECUs. IC Role / Device Role / Timing Role: Main DC/DC regulator with precision enable for controlled power-up sequencing and cold-crank support. Use Value: –40°C to 125°C junction rating meets automotive Grade 1 requirements; integrated soft-start prevents reset glitches during ignition. |
Use Scenario: Powering ARM Cortex-M7 microcontrollers, Ethernet PHYs, and DDR memory in edge IoT gateways. IC Role / Device Role / Timing Role: Adjustable-output buck regulator providing flexible core and I/O voltage rails with minimal external components. Use Value: 1.285-V reference enables accurate 1.2-V core and 1.8-V I/O generation; WEBENCH®-enabled design flow accelerates validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22671MRE-ADJ/NOPB | Same pinout and package, but rated for 45-V max input and includes improved current limit accuracy (±10% vs ±15%). | Better suited for 48-V industrial systems with higher transient margin; identical thermal and layout footprint. | Choose LM22671MRE-ADJ/NOPB if operating near 42-V upper limit or requiring tighter current limit tolerance. |
| TPS54340DDAR | 42-V, 3.5-A buck with current-mode control, 100-μA quiescent current, and no integrated bootstrap diode. | Lower IQ benefits battery-backed systems; current-mode offers faster transient response but requires external compensation. | Choose TPS54340DDAR when ultra-low standby power or dynamic load regulation is prioritized over design simplicity. |
Compared with LM22670MRE-ADJ/NOPB, LM22671MRE-ADJ/NOPB extends input voltage margin and improves current limit spec, while TPS54340DDAR trades integrated features for lower IQ and current-mode responsiveness-requiring more design effort but offering greater flexibility in demanding transient scenarios.
Availability
LM22670MRE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom infrastructure, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM22670MRE-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 LM22670 series belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use in industrial, automotive, and telecom power applications where minimal external components and rapid design-in are critical.
FAQ
What is the minimum output voltage achievable with LM22670MRE-ADJ/NOPB?
The LM22670MRE-ADJ/NOPB has a fixed internal feedback reference voltage of 1.285 V (typ), which sets the lowest possible output voltage when using the ADJ version. This value is specified over temperature (–40°C to 125°C) with ±1.5% accuracy. Therefore, the minimum regulated output is 1.285 V, and any higher output is set via the external resistor divider on the FB pin. The LM22670MRE-ADJ/NOPB cannot regulate below this reference voltage.
Does LM22670MRE-ADJ/NOPB require an external bootstrap diode?
No, the LM22670MRE-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component in the boot circuit. This reduces bill-of-materials count and layout complexity. A 10-nF ceramic capacitor must still be placed between BOOT and SW pins with short, low-inductance traces to ensure proper high-side gate drive during each switching cycle.
Can LM22670MRE-ADJ/NOPB synchronize to an external clock?
Yes, LM22670MRE-ADJ/NOPB supports external clock synchronization via the RT/SYNC pin. When an external square-wave clock (1.75 V threshold, up to 1 MHz) is applied, the device latches into sync mode at startup and locks to the rising edge. Synchronization is only active if the external clock frequency exceeds the internal 500-kHz oscillator and remains within 1 MHz. Note that current limit foldback is disabled during synchronization.
What is the thermal performance of LM22670MRE-ADJ/NOPB in its HSOP-8 package?
The LM22670MRE-ADJ/NOPB in HSOP-8 PowerPAD™ package has a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 in² of 2-oz copper. Actual thermal performance depends on PCB copper area, layer stack-up, and airflow. For continuous 3-A operation at 125°C junction, thermal design must ensure sufficient copper area and minimize ambient temperature rise-TI recommends verifying with thermal simulation or IR imaging.
How does the enable pin (EN) function on LM22670MRE-ADJ/NOPB?
The EN pin on LM22670MRE-ADJ/NOPB provides precision ON/OFF control with a 1.6 V (typ) turn-on threshold and 0.6 V (typ) hysteresis. It features an internal 6-µA pullup, allowing direct connection to VIN via a 470-kΩ resistor for simple activation. Pulling EN below 1.6 V places LM22670MRE-ADJ/NOPB in shutdown, reducing input current to 25 µA (typ). Absolute maximum EN voltage is 6 V-exceeding this risks damage.
LM22670MRE-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
LM22670MRE-ADJ/NOPB FAQ
1.How can I place an order for LM22670MRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22670MRE-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 LM22670MRE-ADJ/NOPB reliable?
The price and inventory of LM22670MRE-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 LM22670MRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22670MRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22670MRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22670MRE-ADJ/NOPB?
LM22670MRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22670MRE-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 LM22670MRE-ADJ/NOPB?
For technical support, including LM22670MRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22670MRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22670MRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22670MRE-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 LM22670MRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22670MRE-ADJ/NOPB?
All LM22670MRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22670MRE-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 LM22670MRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22670MRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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