My Inquiry
My Account
Texas Instruments LM22671MRE-ADJ/NOPB
- Part No.:
- LM22671MRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22671MRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,973
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM22671MRE-ADJ/NOPB from Texas Instruments is a 42 V, 500 mA adjustable-output synchronous buck DC/DC regulator in an HSOP-8 PowerPAD package. It integrates a 200 mΩ N-channel MOSFET switch, supports 4.5–42 V input, delivers output as low as 1.285 V via external feedback divider, and operates at 500 kHz (adjustable 200 kHz–1 MHz) for industrial power conversion in 24 V/12 V rail systems.
For engineers reviewing the LM22671MRE-ADJ/NOPB datasheet, LM22671MRE-ADJ/NOPB pinout, LM22671MRE-ADJ/NOPB application, or LM22671MRE-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, ±1.5% reference accuracy, precision enable with 0.6 V hysteresis, integrated bootstrap diode, and thermal shutdown-critical for reliable 500 mA step-down regulation in space-constrained embedded systems.
Technical Context
The LM22671MRE-ADJ/NOPB employs voltage-mode PWM control with input voltage feed-forward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation is optimized for outputs ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It features a precision enable pin with 1.6 V turn-on threshold and 0.6 V hysteresis, programmable soft-start via external capacitor on SS pin, and RT/SYNC pin supporting three modes: internal 500 kHz oscillator, resistor-adjusted frequency (200 kHz–1 MHz), or external synchronization (up to 1 MHz), 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 direct regulation from unregulated 24 V, 12 V, or automotive battery rails without pre-regulation. |
| Output Current | 500 mA - sufficient for powering microcontrollers, sensors, and interface ICs in industrial and telecom applications. |
| Feedback Reference | 1.285 V (typ), ±1.5% - enables precise adjustable output down to 1.285 V using external resistor divider on FB pin. |
| Switch RDS(on) | 200 mΩ (typ) - reduces conduction loss and improves efficiency (>90% typical at mid-load) in compact layouts. |
| Switching Frequency | 500 kHz (default), adjustable 200 kHz–1 MHz - balances EMI, component size, and transient response; higher frequencies reduce inductor/capacitor footprint. |
| Quiescent Current | 3.4 mA (typ) - ensures low no-load power draw in always-on subsystems; drops to 25 µA in shutdown mode. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial and automotive-grade environments without derating. |
Pinout & Package
LM22671MRE-ADJ/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (RθJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Provides gate drive voltage for internal high-side N-MOSFET; requires 10 nF ceramic capacitor between BOOT and SW. |
| EN | Precision enable control | Active-high logic input with 1.6 V threshold and 0.6 V hysteresis; draws only 6 µA; supports system power sequencing. |
| SW | Switch node output | Drives external inductor; swings from ~0 V to VIN; connects to cathode of external Schottky diode or low-side FET in synchronous designs. |
| RT/SYNC | Oscillator mode control | Selects internal 500 kHz clock, resistor-adjusted frequency (200 kHz–1 MHz), or external sync signal (rising-edge triggered). |
| FB | Feedback input | Monitors output voltage via resistive divider; internal 1.285 V reference sets regulated output: VOUT = 1.285 × (1 + R1/R2). |
| GND | System ground | Reference for all analog circuitry; must be connected to PCB ground plane; exposed pad (EP) is electrically tied to GND. |
| VIN | Main power input | Supplies internal bias and high-side driver; accepts 4.5–42 V; requires local 10 µF ceramic input capacitor. |
| SS | Soft-start timing | Controls startup ramp rate via external capacitor; default internal soft-start is ~500 µs; external cap extends time linearly. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates need for external compensation network-reduces BOM count and layout sensitivity for fast design-in. |
| Stable with ceramic output caps | Supports low-ESR ceramic capacitors (no electrolytic required), improving reliability and reducing board area in harsh environments. |
| Integrated bootstrap diode | Removes need for external bootstrap diode, simplifying layout and reducing component count in high-side gate drive path. |
| Adjustable soft-start | Prevents inrush current and output overshoot during power-up; timing set by single external capacitor on SS pin. |
| Thermal shutdown & current limit | Protects against sustained overload or ambient overheating; triggers at 150°C junction temp and 0.7 A (typ) peak switch current. |
Applications
| Industrial Control | Telecom/Datacom Systems |
|---|---|
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus transceivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 3.3 V or 5 V point-of-load regulator converting 24 V backplane rail with high line/load regulation. Use Value: Wide 4.5–42 V input range accommodates brownout and surge conditions common in industrial 24 V supplies. | Use Scenario: Generating auxiliary 3.3 V or 1.8 V rails for Ethernet PHYs, SFP+ controllers, and baseband processors in access equipment. IC Role / Device Role / Timing Role: Efficient intermediate buck stage stepping down 12 V or -48 V-derived 5 V rails to lower core voltages. Use Value: 500 mA output and 90%+ efficiency minimize heat buildup in densely packed telecom line cards. |
| Embedded Systems | Automotive Body Electronics |
Use Scenario: Supplying power to ARM Cortex-M microcontrollers, CAN transceivers, and display drivers in medical or test equipment. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC converter replacing linear regulators to improve efficiency and reduce thermal load. Use Value: HSOP-8 PowerPAD package enables high-power density with minimal PCB real estate and simplified thermal management. | Use Scenario: Regulating 5 V or 3.3 V for infotainment head units, lighting controllers, and gateway ECUs in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Robust buck regulator meeting automotive temperature requirements (–40°C to +125°C) and transient immunity. Use Value: Precision enable pin allows clean power sequencing with ignition-sense signals; UVLO prevents operation below 4.3 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRE-ADJ/NOPB | Lower 3 V minimum input voltage; same 500 mA rating, but 36 V max VIN instead of 42 V. | Suitable for 5 V/12 V input systems where 42 V capability is unnecessary; slightly lower quiescent current (2.5 mA). | Select when input never exceeds 36 V and ultra-low IQ is prioritized over high-voltage tolerance. |
| TPS54302DDCR | 3.5–28 V input, 3 A output, integrated high/low-side FETs; requires external compensation; smaller SOT-23-6 package. | Better suited for higher-current, space-constrained applications; lacks adjustable frequency/sync and boot diode integration. | Choose for >500 mA loads or tighter board area constraints, accepting added design complexity for compensation. |
Compared with LM22670MRE-ADJ/NOPB, the LM22671MRE-ADJ/NOPB adds 6 V higher input voltage margin and maintains identical pinout and compensation-ideal for 24 V industrial systems with surge risk. Versus TPS54302DDCR, it trades higher current capability for simpler design, integrated bootstrap diode, and wider VIN range-favoring reliability and ease-of-use over raw output capacity.
Availability
LM22671MRE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom/datacom systems, and embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM22671MRE-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, embedded processing, and digital signal processing technologies for industrial, automotive, and communications markets.
The LM22671MRE-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed for rapid, reliable DC/DC buck conversion with minimal external components and full WEBENCH® design tool integration.
FAQ
What is the minimum output voltage achievable with LM22671MRE-ADJ/NOPB?
The LM22671MRE-ADJ/NOPB has a nominal feedback reference voltage of 1.285 V, allowing output voltages as low as 1.285 V when configured with an appropriate resistor divider on the FB pin. The datasheet specifies this value with ±1.5% accuracy over –40°C to +125°C, making it suitable for generating precise 1.3 V, 1.8 V, or 2.5 V rails in embedded systems.
Does LM22671MRE-ADJ/NOPB require an external bootstrap diode?
No, the LM22671MRE-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component between BOOT and VIN. This simplifies layout and reduces bill-of-materials count. A 10 nF ceramic capacitor must still be placed between BOOT and SW to ensure proper high-side gate drive voltage generation.
Can LM22671MRE-ADJ/NOPB synchronize to an external clock?
Yes, the LM22671MRE-ADJ/NOPB supports external synchronization via the RT/SYNC pin. When driven with a rising-edge clock signal between 500 kHz and 1 MHz, the device locks to that frequency. However, synchronization disables current limit foldback, so short-circuit protection behavior differs from free-running mode.
What thermal performance can be expected from LM22671MRE-ADJ/NOPB in HSOP-8 PowerPAD package?
The LM22671MRE-ADJ/NOPB in HSOP-8 PowerPAD package has a junction-to-ambient thermal resistance (RθJA) of 60°C/W under standard JEDEC conditions. With the exposed pad soldered to a 1-in² copper area, it reliably delivers 500 mA continuous output at +85°C ambient without thermal shutdown, assuming adequate airflow and PCB copper pour.
How does the enable pin (EN) function on LM22671MRE-ADJ/NOPB?
The EN pin on LM22671MRE-ADJ/NOPB is a precision enable input with a 1.6 V (typ) turn-on threshold and 0.6 V hysteresis. Pulling EN below 1.3 V disables the regulator, reducing quiescent current to 25 µA (typ). An internal 6 µA pullup allows direct connection to VIN for always-on operation, or use with resistor dividers for controlled sequencing.
LM22671MRE-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:
- 500mA
- 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
LM22671MRE-ADJ/NOPB FAQ
1.How can I place an order for LM22671MRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22671MRE-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 LM22671MRE-ADJ/NOPB reliable?
The price and inventory of LM22671MRE-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 LM22671MRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22671MRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22671MRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22671MRE-ADJ/NOPB?
LM22671MRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22671MRE-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 LM22671MRE-ADJ/NOPB?
For technical support, including LM22671MRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22671MRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22671MRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22671MRE-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 LM22671MRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22671MRE-ADJ/NOPB?
All LM22671MRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22671MRE-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 LM22671MRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22671MRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM22671MRE-ADJ/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
