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Texas Instruments LM2671M-ADJ/NOPB
- Part No.:
- LM2671M-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2671M-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,169
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Product details
Overview
LM2671M-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC with adjustable output voltage (1.21 V to 37 V), 500-mA output current capability, 260-kHz fixed-frequency operation, and integrated 0.25-Ω DMOS power switch - used in industrial power supplies and embedded systems requiring high-efficiency voltage conversion from 8 V–40 V input sources.
For engineers reviewing the LM2671M-ADJ/NOPB datasheet, LM2671M-ADJ/NOPB pinout, LM2671M-ADJ/NOPB application, or LM2671M-ADJ/NOPB equivalent, key selection considerations include feedback voltage tolerance (±1.5%), soft-start control via external capacitor, TTL-compatible ON/OFF enable, SYNC frequency synchronization capability, and thermal shutdown protection.
Technical Context
The LM2671M-ADJ/NOPB implements a current-mode PWM controller with internal 260-kHz oscillator, fixed-frequency operation, and cycle-by-cycle current limiting. Its DMOS power switch delivers up to 500 mA with RDS(ON) = 0.25 Ω at 25°C, enabling >90% efficiency across load and line conditions.
It features an internal two-stage high-gain feedback amplifier referenced to 1.21 V (VFB), soft-start controlled by external capacitor on SS pin, and synchronous clock input (SYNC) supporting external frequency forcing above 275 kHz. Shutdown mode draws only 50 μA standby current when ON/OFF pin is pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500 mA maximum continuous - supports mid-power industrial loads without external pass devices. |
| Input Voltage Range | 6.5 V to 40 V - accommodates wide-range unregulated DC inputs including 12 V, 24 V, and 36 V battery or rail systems. |
| Feedback Voltage | 1.21 V ±1.5% - sets output via resistor divider; enables precise 1.21–37 V adjustment with minimal drift over temperature. |
| Switching Frequency | 260 kHz (±10%) - allows compact LC filter design while avoiding AM radio band interference. |
| Efficiency | Up to 90% at 12 VIN/500 mA - reduces thermal load and eliminates need for heatsinks in PCB copper-only thermal management. |
| Quiescent Current | 3.6 mA typical active, 50 μA standby - enables low-power system sleep modes without compromising wake-up response. |
| Thermal Protection | Integrated thermal shutdown - disables switch and prevents damage during sustained overload or poor airflow. |
Pinout & Package
LM2671M-ADJ/NOPB is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present. Pin functions are validated per TI SNVS008L Rev L datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100-nF ceramic capacitor to VSW to drive high-side MOSFET gate above VIN for full enhancement. |
| SS | Soft-start control input | External capacitor to GND controls output voltage ramp rate; floating disables soft-start. |
| SYNC | Frequency synchronization input | Accepts TTL/CMOS clock >275 kHz to lock switching frequency; open-circuit defaults to 260 kHz. |
| FB | Feedback sense input | Monitors voltage divider midpoint; regulates output to 1.21 V reference - determines final VOUT. |
| ON/OFF | Enable/disable control | TTL-compatible input: ≥1.4 V enables, ≤0.8 V disables; internal 20-μA pullup simplifies logic interfacing. |
| VSW | Switch node output | Drives external inductor and Schottky diode cathode; swings from VIN to ~−0.5 V during switching. |
| GND | Power ground | Common return for input/output capacitors and internal circuitry; requires short, low-inductance PCB trace. |
| VIN | Input supply | Accepts 6.5–40 V DC; must be bypassed with local high-frequency capacitor to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.25-Ω RDS(ON) enables 500-mA output without external FET or heat sink - reduces BOM count and layout area. |
| Fixed 260-kHz oscillator | Enables consistent EMI profile and predictable filter sizing; avoids subharmonic oscillation in current-mode control. |
| Adjustable output range | 1.21 V to 37 V via two-resistor feedback divider - supports diverse system rails including analog, digital, and sensor supplies. |
| TTL-compatible ON/OFF control | 50-μA standby current and 1.4-V enable threshold allow direct interface with microcontrollers and logic-level sequencers. |
| Internal frequency compensation | Eliminates need for external compensation network - simplifies design and improves stability across operating conditions. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
Use Scenario: Converting 24 V DC bus to 5 V/3.3 V for PLC I/O modules and field sensors. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 500-mA output with tight line/load regulation. Use Value: 90% efficiency minimizes board heating; 6.5–40 V input range tolerates brownouts and battery sag. |
Use Scenario: Generating 3.3 V intermediate rail from 12 V main supply before linear LDO for FPGA core voltage. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing dropout and thermal stress on downstream LDO. Use Value: 260-kHz switching enables small 22-μH inductor; soft-start prevents inrush into downstream capacitance. |
| Automotive Body Control Module | Test Equipment Power Stage |
Use Scenario: Providing stable 12 V or adjustable output for microcontroller peripherals in 12 V vehicle systems. IC Role / Device Role / Timing Role: Buck converter handling load dump transients up to 40 V input with thermal shutdown protection. Use Value: ±1.5% VFB tolerance ensures accurate sensor biasing; SYNC pin allows EMI synchronization with system clock. |
Use Scenario: Programmable bench supply stage where output voltage is set via DAC-controlled feedback resistors. IC Role / Device Role / Timing Role: Adjustable-output switching regulator configured for lab-grade voltage accuracy and ripple control. Use Value: 1.21 V reference enables <1% output error; FB pin bias current (85 nA) minimizes divider resistor loading error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2672MX-ADJ/NOPB | Same architecture but rated for 1-A output; higher RDS(ON) (0.35 Ω) and larger SOIC-8 thermal footprint. | Supports higher-current loads without redesign; requires larger inductor and output capacitor. | Select when >500 mA peak load or higher thermal margin is required; pinout identical but layout thermal relief must scale. |
| TPS5430DDAR | 3-A synchronous buck with integrated high/low-side FETs; 500-kHz switching; no external diode needed. | Higher integration reduces component count but increases complexity in feedback loop compensation. | Choose for space-constrained designs needing >500 mA; not drop-in due to different pinout, sync behavior, and compensation requirements. |
Compared with LM2671M-ADJ/NOPB, LM2672MX-ADJ/NOPB offers higher current capacity in same package, while TPS5430DDAR provides synchronous rectification and higher integration at cost of design complexity and non-pin-compatible layout.
Availability
LM2671M-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for LM2671M-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 power conversion ICs.
The LM2671 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use, minimal external component count, and robust performance in industrial and commercial DC-DC conversion applications.
FAQ
What is the minimum input voltage required for stable operation of the LM2671M-ADJ/NOPB?
The LM2671M-ADJ/NOPB specifies a recommended minimum input voltage of 6.5 V across its operating temperature range. Below this, regulation may be lost due to insufficient headroom for the internal control circuitry and switch driver. At 25°C, functional operation has been verified down to 6.5 V with full 500-mA load capability and ±1.5% output tolerance - confirmed in Section 7.3 of the SNVS008L datasheet.
How does the soft-start function work on the LM2671M-ADJ/NOPB, and what capacitor value is recommended?
The LM2671M-ADJ/NOPB uses an internal 4.5-μA current source to charge an external capacitor on the SS pin, controlling the ramp rate of the output voltage. A 10-nF capacitor yields ~2.2-ms soft-start time; values from 1 nF to 100 nF are supported. Leaving SS floating disables soft-start entirely. This feature prevents inrush current into large output capacitors and avoids system-level reset glitches during power-up.
Can the LM2671M-ADJ/NOPB synchronize to an external clock, and what are the electrical requirements?
Yes - the LM2671M-ADJ/NOPB accepts an external TTL/CMOS clock on the SYNC pin to force switching frequency above its internal 260-kHz oscillator (up to 400 kHz). The signal must exceed 1.4 V threshold, be ac-coupled via 100-pF capacitor + 1-kΩ resistor to GND, and maintain >275 kHz to avoid oscillator reset anomalies. When enabled, frequency foldback protection is disabled - a documented trade-off per Section 8.3.5.
What is the purpose of the CB pin on the LM2671M-ADJ/NOPB, and how must it be connected?
The CB (bootstrap capacitor) pin on the LM2671M-ADJ/NOPB provides gate drive voltage boost for the internal high-side DMOS switch. It must be connected via a 100-nF ceramic capacitor directly to the VSW pin - not to GND or VIN. This bootstrap configuration ensures the gate-source voltage remains >5 V across the full input range, maintaining low RDS(ON) and high efficiency. Omitting or misrouting this capacitor causes erratic switching or failure to regulate.
Does the LM2671M-ADJ/NOPB include overcurrent and thermal protection, and how do they behave under fault conditions?
Yes - the LM2671M-ADJ/NOPB integrates cycle-by-cycle current limiting (typical 0.62–1.2 A trip threshold) and thermal shutdown (activates at ~150°C junction temperature). Under sustained overload, current limit triggers immediate switch turn-off per cycle; if overheating occurs, thermal shutdown latches off the device until temperature falls below ~135°C. Both protections are fully specified in Sections 7.9 and 7.4 of the SNVS008L datasheet.
LM2671M-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (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):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 500mA
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2671M-ADJ/NOPB FAQ
1.How can I place an order for LM2671M-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671M-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 LM2671M-ADJ/NOPB reliable?
The price and inventory of LM2671M-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 LM2671M-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2671M-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671M-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671M-ADJ/NOPB?
LM2671M-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671M-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 LM2671M-ADJ/NOPB?
For technical support, including LM2671M-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671M-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2671M-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2671M-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 LM2671M-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2671M-ADJ/NOPB?
All LM2671M-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2671M-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 LM2671M-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2671M-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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