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Texas Instruments LM22670QMRX-ADJ/NOPB
- Part No.:
- LM22670QMRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22670QMRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,146
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Product details
Overview
LM22670QMRX-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 (down to 1.285 V), 500-kHz default switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode. It delivers high efficiency (>90%) in industrial power rails converting 24-V or 12-V inputs to low-voltage logic supplies.
For engineers reviewing the LM22670QMRX-ADJ/NOPB datasheet, LM22670QMRX-ADJ/NOPB pinout, LM22670QMRX-ADJ/NOPB application, or LM22670QMRX-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance with exposed pad, adjustable frequency via RT/SYNC, precision enable threshold (1.6 V typ), and internal voltage-mode compensation optimized for ≤5-V outputs.
Technical Context
The LM22670QMRX-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN variations. Its internal Type III compensation network is factory-tuned for stability with ceramic output capacitors and inductors suitable for ≤5-V outputs.
It integrates a 120-mΩ N-channel MOSFET switch, bootstrap gate driver with dedicated BOOT pin, and precision enable with 0.6-V hysteresis. The RT/SYNC pin supports three modes: internal 500-kHz oscillator, resistor-adjusted frequency (200 kHz–1 MHz), or external synchronization-mode selected at startup by pin voltage sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 24-V industrial buses and automotive battery rails without pre-regulation. |
| Output Current | Up to 3 A continuous - enables single-regulator solutions for FPGA core, DSP, or microcontroller power domains. |
| Feedback Reference | 1.285 V (typ), ±1.5% - sets minimum adjustable output; enables precise low-voltage generation (e.g., 1.8 V, 2.5 V, 3.3 V) with external resistor divider. |
| Switching Frequency | 500 kHz (default), adjustable 200 kHz–1 MHz - balances EMI control, inductor size, and transient response; synchronization avoids beat frequencies in multi-rail systems. |
| RDS(ON) | 120 mΩ (PFM package, 25°C) - reduces conduction loss at full load; thermal derating applies above 85°C ambient. |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - minimizes standby power in always-on subsystems while enabling fast wake-up. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments. |
Pinout & Package
LM22670QMRX-ADJ/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground plane for enhanced heat dissipation (RθJA = 60°C/W with 1-in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | Drives external inductor; connects to BOOT capacitor; swings between GND and VIN during operation. |
| 2 VIN | Power Input | Primary supply input (4.5–42 V); decoupling capacitor must be placed adjacent to this pin. |
| 3 BOOT | Bootstrap Supply | Provides gate drive voltage for internal high-side MOSFET; requires 10-nF ceramic capacitor to SW. |
| 4 GND | Ground Reference | Analog and power ground return; tied 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; internal 1.285-V reference sets regulation point. |
| 7 EN | Enable Input | Logic-level ON/OFF control; 1.6-V threshold with 0.6-V hysteresis; internal 6-µA pullup allows simple VIN tie. |
| 8 EP | Exposed Pad | Thermal and electrical connection to PCB ground; mandatory for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Voltage Mode Control | Eliminates external compensation components; stable with low-ESR ceramic capacitors and standard inductors. |
| Integrated Bootstrap Diode | Removes need for external bootstrap diode; simplifies layout and improves reliability in high-duty-cycle applications. |
| Adjustable Switching Frequency & Synchronization | Enables EMI optimization and multi-regulator phase alignment without adding timing ICs or complex clock distribution. |
| Precision Enable with UVLO Support | Allows controlled power sequencing and system-level undervoltage protection using resistor dividers or discrete comparators. |
| Soft-Start (500 µs typical) | Prevents inrush current and output overshoot during startup; resets automatically on shutdown or thermal fault. |
Applications
| Industrial PLC I/O Module | Telecom Line Card Power |
|---|---|
Use Scenario: Powering isolated analog front-ends and digital signal processors in programmable logic controllers with 24-V backplane input. IC Role / Device Role / Timing Role: Primary buck converter generating 3.3-V and 1.8-V rails from unregulated 24-V supply; regulates based on FB voltage with internal 1.285-V reference. Use Value: High input voltage tolerance eliminates need for intermediate pre-regulators; 3-A capability supports multiple downstream LDOs or point-of-load converters. |
Use Scenario: Generating 5-V and 3.3-V supplies on telecom line cards fed from -48-V or +24-V distributed power buses. IC Role / Device Role / Timing Role: Step-down regulator operating in constant-frequency PWM mode; synchronized to system clock via RT/SYNC to suppress conducted EMI. Use Value: Adjustable frequency avoids interference with data transmission bands; thermal robustness ensures reliability in fanless chassis. |
| Automotive Body Control Module | Embedded System Power Management |
Use Scenario: Providing regulated 5-V and 3.3-V supplies in body electronics modules exposed to 12-V battery transients up to 42 V. IC Role / Device Role / Timing Role: Automotive-grade buck regulator (LM22670-Q1 derivative) with AEC-Q100 Grade 1 qualification; enabled via microcontroller GPIO through EN pin. Use Value: Wide VIN range handles cold-crank and load-dump events; precision enable supports safe power sequencing during MCU boot. |
Use Scenario: Powering ARM-based SoCs and memory subsystems in edge computing gateways requiring stable 1.2-V, 1.8-V, and 3.3-V rails. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured as primary DC/DC stage; FB pin connected to resistor divider for exact voltage setting. Use Value: Internal loop compensation reduces design iteration time; WEBENCH® integration accelerates component selection and thermal 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 |
|---|---|---|---|
| LM22671QMRX-ADJ/NOPB | Same pinout and features, but rated for 45-V max input and includes improved current limit foldback. | Preferred for designs requiring higher input surge margin or tighter overload protection in harsh environments. | Select LM22671QMRX-ADJ/NOPB when operating near 42-V absolute maximum or needing enhanced short-circuit behavior. |
| TPS54340DDAR | 42-V, 3.5-A buck with current-mode control, 100-μA quiescent current, and no integrated bootstrap diode. | Better light-load efficiency and faster transient response; requires external bootstrap diode and external compensation. | Choose TPS54340DDAR for battery-powered or ultra-low-IQ applications where layout complexity is acceptable. |
Compared with LM22670QMRX-ADJ/NOPB, LM22671QMRX-ADJ/NOPB offers higher input voltage margin and refined protection, while TPS54340DDAR trades integrated simplicity for superior light-load efficiency and current-mode responsiveness-making each optimal for distinct trade-offs in thermal, transient, and system-level constraints.
Availability
LM22670QMRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded system designs requiring stable component supply across long production lifecycles.
Supply support for LM22670QMRX-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 and embedded processing solutions, with over 90 years of innovation in power management ICs and high-reliability design.
The LM22670 series belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use in non-isolated DC/DC buck applications, minimizing external component count while maintaining robust performance across industrial and automotive temperature ranges.
FAQ
What is the minimum output voltage achievable with LM22670QMRX-ADJ/NOPB?
The LM22670QMRX-ADJ/NOPB has a nominal feedback reference voltage of 1.285 V, which defines its minimum regulated output. With proper resistor divider design and layout, it reliably achieves outputs as low as 1.285 V. The ±1.5% reference accuracy means the actual minimum may vary between 1.259 V and 1.311 V over temperature (–40°C to +125°C). Outputs below 1.285 V are not supported by the internal reference.
Does LM22670QMRX-ADJ/NOPB require an external bootstrap diode?
No, LM22670QMRX-ADJ/NOPB integrates a bootstrap diode internally. This eliminates the need for an external diode between VIN and BOOT, simplifying layout and improving reliability. A 10-nF ceramic capacitor must still be placed directly between BOOT and SW pins with minimal trace length to ensure proper gate drive voltage during high-side switch operation.
Can LM22670QMRX-ADJ/NOPB synchronize to an external clock?
Yes, LM22670QMRX-ADJ/NOPB supports external synchronization via the RT/SYNC pin. When an external clock signal (1.75-V threshold, 50% duty cycle, frequency >500 kHz and <1 MHz) is applied during startup, the device latches into sync mode and locks to the rising edge of that clock. If the external clock is lost during operation, it automatically reverts to its internal 500-kHz oscillator.
What thermal considerations apply to LM22670QMRX-ADJ/NOPB in HSOP-8 PowerPAD™ package?
LM22670QMRX-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, the PCB must provide adequate copper area and thermal vias under the exposed pad. Derating is required above 85°C ambient; full 3-A output is guaranteed only up to +85°C case temperature per datasheet limits.
How does the enable function work on LM22670QMRX-ADJ/NOPB?
The EN pin on LM22670QMRX-ADJ/NOPB provides precision ON/OFF control with a 1.6-V typical turn-on threshold and 0.6-V hysteresis. It features an internal 6-µA pullup, allowing direct connection to VIN via a 470-kΩ resistor for simple enable. Pulling EN below 1.6 V disables the regulator, reducing input current to 25 µA typical. The pin tolerates voltages up to 6 V absolute maximum.
LM22670QMRX-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:
- Obsolete
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22670QMRX-ADJ/NOPB FAQ
1.How can I place an order for LM22670QMRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22670QMRX-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 LM22670QMRX-ADJ/NOPB reliable?
The price and inventory of LM22670QMRX-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 LM22670QMRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22670QMRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22670QMRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22670QMRX-ADJ/NOPB?
LM22670QMRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22670QMRX-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 LM22670QMRX-ADJ/NOPB?
For technical support, including LM22670QMRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22670QMRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22670QMRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22670QMRX-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 LM22670QMRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22670QMRX-ADJ/NOPB?
All LM22670QMRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22670QMRX-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 LM22670QMRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22670QMRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM22670QMRX-ADJ/NOPB Tags
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