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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM22670QMR-ADJ/NOPB

Name: LM22670QMR-ADJ/NOPB
Brand: Texas Instruments
SKU: LM22670QMR-ADJ/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM22670QMR-ADJ/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-PowerSOIC (0.154", 3.90mm Width)

Datasheet:: LM22670QMR-ADJ/NOPB.pdf

Description:: IC REG BUCK ADJ 3A 8SOPWR

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Product details

Overview

LM22670QMR-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 200 kHz–1 MHz switching frequency adjustment via RT/SYNC pin, and delivers >90% efficiency in industrial power conversion applications.

For engineers reviewing the LM22670QMR-ADJ/NOPB datasheet, LM22670QMR-ADJ/NOPB pinout, LM22670QMR-ADJ/NOPB application, or LM22670QMR-ADJ/NOPB equivalent, key selection considerations include its 4.5–42 V input range, ±1.5% feedback reference accuracy, integrated bootstrap diode, precision enable threshold (1.6 V typ), and thermal shutdown at 150°C - all critical for robust 24-V rail conversion and automotive-grade power designs.

Technical Context

The LM22670QMR-ADJ/NOPB implements a voltage-mode PWM architecture 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, supporting stable operation with low-ESR ceramic capacitors and standard power inductors.

Functional modes include active regulation, precision enable-controlled shutdown (25 µA standby current), and self-protection features: cycle-by-cycle current limiting (ICL = 3.4 A typ), thermal shutdown (150°C), and minimum on-time (100 ns) enforced to ensure boot-strap capacitor recharge. Synchronization capability allows RT/SYNC pin to accept external clocks up to 1 MHz for EMI reduction.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 42 V - supports direct connection to 24-V, 12-V, and 5-V industrial rails without pre-regulation.
Output Current	Up to 3 A continuous - sufficient for powering FPGAs, microcontrollers, and analog subsystems from single-stage buck conversion.
Feedback Reference	1.285 V (typ), ±1.5% accuracy - enables precise adjustable output down to 1.285 V using external resistor divider.
Switching Frequency	500 kHz default, adjustable 200 kHz–1 MHz - balances efficiency, component size, and EMI compliance in space-constrained layouts.
MOSFET R_DS(on)	120 mΩ (PFM package) - minimizes conduction loss at full load, contributing to >90% peak efficiency at 12 V_IN/3.3 V_OUT.
Enable Threshold	1.6 V (typ), 0.6 V hysteresis - allows reliable power sequencing with simple resistor dividers from upstream supplies.
Operating Junction Temp	–40°C to +125°C - qualified for extended-temperature industrial and automotive environments (Q1 variant AEC-Q100 Grade 1).

Pinout & Package

LM22670QMR-ADJ/NOPB is housed in an HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (R_θJA = 60°C/W with 1-in² copper).

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Switch Node Output	Drives external inductor; swings between GND and VIN; requires low-inductance layout to minimize EMI and ringing.
2 VIN	Main Input Supply	Accepts 4.5–42 V; must be decoupled near pin with low-ESR ceramic capacitor to suppress high-frequency ripple.
3 BOOT	Bootstrap Supply	Connects to SW via 10-nF ceramic capacitor; powers high-side gate driver; mandates minimum off-time for recharge.
4 GND	Power Ground	System return path; ties to exposed pad; must be low-impedance plane for noise immunity and thermal performance.
5 RT/SYNC	Oscillator Control	Selects mode: floating = 500 kHz, resistor-to-GND = 200 kHz–1 MHz, external clock = synchronization up to 1 MHz.
6 FB	Feedback Input	Monitors output via resistor divider; internal 1.285 V reference sets V_OUT = 1.285 × (1 + R1/R2); bias current 230 nA.
7 EN	Enable Control	Active-high logic; 1.6 V threshold with 0.6 V hysteresis; internal 6 µA pullup allows direct VIN tie via 470-kΩ resistor.
8 NC	No Connect	Not electrically bonded; may serve as thermal conductor; must not be routed or connected in PCB layout.

Key Features

Feature	Design Value
Internally Compensated Voltage Mode Control	Eliminates need for external compensation network - reduces BOM count and design iteration time for 3.3 V/5 V/ADJ outputs.
Integrated Boot-Strap Diode	Removes external Schottky diode requirement - simplifies layout, improves reliability, and reduces footprint in HSOP-8 package.
Adjustable Switching Frequency & Synchronization	Enables EMI spread-spectrum tuning and multi-rail phase alignment - critical for noise-sensitive datacom and embedded systems.
Integrated Soft-Start (500 µs)	Prevents inrush current and output overshoot during power-up - avoids stress on downstream capacitors and ICs without external timing components.
Precision Enable with UVLO	Supports controlled power sequencing and battery discharge protection - dual functionality via single EN pin with programmable thresholds.

Applications

Industrial Motor Drives	Telecom Line Cards
Use Scenario: Powering gate drivers, isolated ADCs, and digital I/O in PLC modules operating from 24-V factory bus. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering regulated 3.3 V/5 V from unregulated 24-V input. Use Value: 42-V max input withstands load-dump transients; 125°C junction rating ensures reliability in enclosed cabinets; soft-start prevents relay chatter during cold start.	Use Scenario: Generating 1.8 V and 3.3 V rails for FPGA, SerDes, and PHY ICs on telecom line cards powered by –48 V or 24-V backplane. IC Role / Device Role / Timing Role: Secondary point-of-load regulator converting intermediate 5-V or 12-V supply to low-voltage logic rails. Use Value: Adjustable FB reference enables exact voltage matching; 500-kHz switching allows compact 2.2-µH inductors; SYNC pin aligns switching edges to reduce conducted EMI.
Automotive Body Control Modules	Embedded Medical Devices
Use Scenario: Supplying microcontroller, CAN transceiver, and sensor interfaces in BCMs powered from 12-V battery with load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Main system regulator providing stable 5-V and 3.3-V outputs despite wide input variation (5–42 V). Use Value: 4.5–42 V input range covers cold-crank (5 V) to load-dump (42 V); AEC-Q100 Grade 1 qualification (LM22670-Q1) ensures automotive reliability.	Use Scenario: Powering low-noise analog front-ends and ARM Cortex-M processors in portable diagnostic equipment running from Li-ion or 24-V wall adapters. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-power buck regulator enabling long battery life and minimal thermal rise in sealed enclosures. Use Value: 25 µA shutdown current extends battery runtime; ±1.5% V_FB accuracy maintains sensor calibration; ceramic-capacitor stability avoids tantalum dependency.

Industrial Motor Drives

Telecom Line Cards

Use Scenario: Powering gate drivers, isolated ADCs, and digital I/O in PLC modules operating from 24-V factory bus.

IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering regulated 3.3 V/5 V from unregulated 24-V input.

Use Value: 42-V max input withstands load-dump transients; 125°C junction rating ensures reliability in enclosed cabinets; soft-start prevents relay chatter during cold start.

Use Scenario: Generating 1.8 V and 3.3 V rails for FPGA, SerDes, and PHY ICs on telecom line cards powered by –48 V or 24-V backplane.

IC Role / Device Role / Timing Role: Secondary point-of-load regulator converting intermediate 5-V or 12-V supply to low-voltage logic rails.

Use Value: Adjustable FB reference enables exact voltage matching; 500-kHz switching allows compact 2.2-µH inductors; SYNC pin aligns switching edges to reduce conducted EMI.

Automotive Body Control Modules

Embedded Medical Devices

Use Scenario: Supplying microcontroller, CAN transceiver, and sensor interfaces in BCMs powered from 12-V battery with load-dump and cold-crank conditions.

IC Role / Device Role / Timing Role: Main system regulator providing stable 5-V and 3.3-V outputs despite wide input variation (5–42 V).

Use Value: 4.5–42 V input range covers cold-crank (5 V) to load-dump (42 V); AEC-Q100 Grade 1 qualification (LM22670-Q1) ensures automotive reliability.

Use Scenario: Powering low-noise analog front-ends and ARM Cortex-M processors in portable diagnostic equipment running from Li-ion or 24-V wall adapters.

IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-power buck regulator enabling long battery life and minimal thermal rise in sealed enclosures.

Use Value: 25 µA shutdown current extends battery runtime; ±1.5% V_FB accuracy maintains sensor calibration; ceramic-capacitor stability avoids tantalum dependency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM22671QMR-ADJ/NOPB	Same pinout, 500-kHz fixed frequency only (no RT/SYNC adjust/sync), 100-mΩ MOSFET (SO PowerPAD-8)	Lacks frequency tuning - suitable where EMI profile is fixed and layout simplicity prioritized over flexibility.	Choose when design requires lower R_DS(on) but does not need adjustable frequency or synchronization.
LM2596T-ADJ/NOPB	Lower VIN max (40 V), 3-A rating, 150-kHz fixed frequency, TO-220 package, no integrated bootstrap diode	Requires external bootstrap diode and larger magnetics; higher thermal resistance limits power density in compact designs.	Choose for cost-sensitive, non-space-constrained applications where 150-kHz switching and through-hole assembly are acceptable.

Compared with LM22671QMR-ADJ/NOPB, the LM22670QMR-ADJ/NOPB offers frequency adjustability and synchronization at the cost of slightly higher R_DS(on); versus LM2596T-ADJ/NOPB, it provides superior thermal performance, integrated bootstrap, and higher switching frequency for smaller passive components - making it optimal for modern high-density industrial and automotive PCBs.

Availability

LM22670QMR-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-compliant alternatives.

Supply support for LM22670QMR-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 solutions.

The LM22670 series belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in industrial, automotive, and telecom power systems, emphasizing minimal external components, internal compensation, and WEBENCH®-enabled design acceleration.

FAQ

What is the minimum output voltage supported by the LM22670QMR-ADJ/NOPB?

The LM22670QMR-ADJ/NOPB supports a minimum output voltage of 1.285 V (typical), set by its internal feedback reference voltage. This value is specified over temperature (–40°C to +125°C) with ±1.5% accuracy, enabling precise low-voltage rail generation for modern microcontrollers and sensors without external trimming.

Does the LM22670QMR-ADJ/NOPB require an external bootstrap diode?

No, the LM22670QMR-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external Schottky diode. This reduces component count, PCB area, and potential failure points - a key differentiator from legacy controllers like the LM2596, and confirmed in the device's Feature Description section and Pin Functions table.

Can the LM22670QMR-ADJ/NOPB synchronize to an external clock?

Yes, the LM22670QMR-ADJ/NOPB can synchronize to an external clock applied to the RT/SYNC pin. The device detects synchronization mode during startup if the pin voltage is forced above or below ~0.8 V, accepts clocks up to 1 MHz, and locks to the rising edge - enabling EMI reduction and multi-rail phase alignment in complex power systems.

What is the thermal resistance (R_θJA) of the LM22670QMR-ADJ/NOPB in its HSOP-8 PowerPAD™ package?

The LM22670QMR-ADJ/NOPB in HSOP-8 PowerPAD™ package has a junction-to-ambient thermal resistance (R_θJA) of 60°C/W when mounted on 1 in² of 2-oz copper. Actual values range from 42°C/W to 115°C/W depending on PCB copper area and thermal vias - underscoring the importance of proper exposed pad grounding per TI's layout guidelines.

How does the LM22670QMR-ADJ/NOPB handle overcurrent conditions?

The LM22670QMR-ADJ/NOPB employs cycle-by-cycle peak current limiting with a typical threshold of 3.4 A. Under sustained overload, it enters low-frequency foldback mode (~100 kHz) to limit power dissipation and prevent thermal runaway - a behavior explicitly documented in Section 7.4.3 and Electrical Characteristics tables of the SNVS584P datasheet.

LM22670QMR-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:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO PowerPad

LM22670QMR-ADJ/NOPB FAQ

1.How can I place an order for LM22670QMR-ADJ/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM22670QMR-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 LM22670QMR-ADJ/NOPB reliable?

The price and inventory of LM22670QMR-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 LM22670QMR-ADJ/NOPB is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22670QMR-ADJ/NOPB transactions.

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LM22670QMR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM22670QMR-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 LM22670QMR-ADJ/NOPB?

For technical support, including LM22670QMR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22670QMR-ADJ/NOPB requirements.

6.How does Aetrix verify that LM22670QMR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?

All LM22670QMR-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 LM22670QMR-ADJ/NOPB meets industry standards.

7.What is the process for return or replacement of LM22670QMR-ADJ/NOPB?

All LM22670QMR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22670QMR-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 LM22670QMR-ADJ/NOPB part is unused and in its original packaging.

Return procedure for LM22670QMR-ADJ/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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