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Texas Instruments LM2670T-ADJ/NOPB
- Part No.:
- LM2670T-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2670T-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:171
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Product details
Overview
LM2670T-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC delivering up to 3A output current with adjustable output voltage (1.2V–37V), 8V–40V input range, 260kHz fixed-frequency operation, and integrated 150mΩ DMOS high-side switch - used in battery chargers, communications equipment, and system preregulators.
For engineers reviewing the LM2670T-ADJ/NOPB datasheet, LM2670T-ADJ/NOPB pinout, LM2670T-ADJ/NOPB application, or LM2670T-ADJ/NOPB equivalent, key selection criteria include ±2% output tolerance over line/load/temperature, 50µA standby current in shutdown mode, external sync capability (280–400kHz), thermal shutdown, and current limiting - all critical for reliable high-efficiency power conversion design.
Technical Context
The LM2670T-ADJ/NOPB implements a voltage-mode PWM controller with internal 260kHz oscillator and optional external synchronization via SYNC pin (5), enabling precise ripple frequency control for EMI-sensitive applications. Its feedback loop uses a two-stage high-gain amplifier referenced to 1.21V VFB (typical) to regulate output via external resistor divider.
It integrates a 150mΩ DMOS high-side switch with current limit of 3.8–5.25A (min–max), operates across –40°C to +125°C junction temperature, and supports shutdown via ON/OFF pin (threshold 1.4V) with 50µA quiescent current - enabling robust, thermally managed operation in industrial and communications systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | Up to 3A continuous load capability - supports high-power embedded subsystems without external current boosting. |
| Input voltage range | 8V to 40V - accommodates wide-input industrial, automotive, and telecom supply rails. |
| Output voltage range | Adjustable 1.2V to 37V - enables flexible regulation for diverse downstream circuitry using two external resistors. |
| Feedback reference voltage | 1.21V (typical), ±2% tolerance - sets precise output accuracy independent of temperature and load variation. |
| Switching frequency | 260kHz fixed internal oscillator - balances efficiency, component size, and EMI performance in standard designs. |
| Standby current | 50µA (typical) when ON/OFF pin < 0.8V - minimizes system-level power loss during idle or sleep modes. |
| Thermal protection | Integrated thermal shutdown - prevents damage under sustained overload or poor heatsinking conditions. |
Pinout & Package
LM2670T-ADJ/NOPB is supplied in the KTW (TO-263-7) package: 10.1mm × 15.24mm thermally enhanced surface-mount outline with exposed thermal pad tied to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch_output) | High-side MOSFET drain node | Switching node connecting to inductor and external Schottky diode cathode - requires low-inductance layout to minimize ringing and EMI. |
| 2 (Input) | Main power input | Accepts 8–40V supply; must be bypassed with low-ESR capacitor placed adjacent to pin to stabilize internal bias and reduce input ripple. |
| 3 (CBOOST/CB) | Bootstrap capacitor connection | Connects 100nF ceramic capacitor to Switch_output to generate gate drive voltage > VIN for full enhancement of internal DMOS switch. |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and thermal pad - must be tied directly to large copper plane for thermal and noise performance. |
| 5 (SYNC) | External clock input | Accepts TTL/CMOS clock (280–400kHz) to synchronize switching frequency - enables consistent EMI filtering and spectrum positioning in multi-rail systems. |
| 6 (Feedback/FB) | Voltage sense input | Monitors output via resistor divider; regulates output to 1.21V reference - determines final VOUT = 1.21V × (1 + R1/R2) for ADJ version. |
| 7 (ON/OFF) | Enable control input | Logic-level shutdown: <0.8V = OFF (50µA IQ), >1.4V = ON - supports system-level power sequencing and low-power states. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Enables >90% efficiency at full 3A load without external FETs - reduces BOM count and PCB area. |
| ±2% output voltage tolerance | Guarantees tight regulation across –40°C to +125°C, full line/load range - eliminates need for post-regulation trimming in precision systems. |
| External sync capability (280–400kHz) | Allows deterministic ripple frequency placement - essential for meeting CISPR/EN55022 conducted EMI limits in comms/radio gear. |
| WEBENCH® Power Designer support | Provides instant schematic generation, component selection, and performance simulation - accelerates design cycle from concept to prototype. |
| Thermal shutdown + current limiting | Hardware-level fault protection - ensures safe operation during short-circuit, overtemperature, or startup overload events without software intervention. |
Applications
| Battery Charger | Communications Equipment |
|---|---|
Use Scenario: Constant-current/constant-voltage charging of 12V–24V Li-ion or lead-acid battery packs in portable test equipment or backup systems. IC Role / Device Role / Timing Role: Primary step-down regulator providing programmable output voltage and current-limited charging profile. Use Value: Adjustable 1.2V–37V output and built-in current limit enable direct integration into charger control loops without additional sensing circuitry. | Use Scenario: Local point-of-load regulation for RF transceivers, baseband processors, and analog front-ends in cellular infrastructure or wireless test instruments. IC Role / Device Role / Timing Role: Synchronized buck converter supplying stable, low-noise supply rails with controlled ripple frequency. Use Value: External SYNC pin allows alignment of switching frequency to avoid interference with sensitive RF bands - improving signal integrity and spectral purity. |
| Industrial System Preregulator | Embedded Control Power Supply |
Use Scenario: Efficient intermediate voltage conversion (e.g., 24V → 5V/3.3V) feeding linear regulators or LDOs in PLC I/O modules or motor drives. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing thermal load on downstream LDOs while maintaining tight transient response. Use Value: 3A output current and 8V–40V input range accommodate wide industrial input variations, while ±2% tolerance ensures stable LDO input headroom. | Use Scenario: Main power source for microcontrollers, FPGA I/O banks, and sensor interfaces in edge IoT gateways or smart sensors operating from 12V or 24V field supplies. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC converter enabling single-layer or space-constrained PCB layouts. Use Value: TO-263-7 package with exposed thermal pad delivers >3A capability in minimal footprint - simplifying thermal management versus discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671-ADJ/NOPB | 2.5A output current, same 8–40V input, identical pinout and FB voltage (1.21V), but lower current rating and no SYNC pin. | Suitable where 3A peak load is not required and EMI synchronization is unnecessary - e.g., low-power industrial controllers. | Select LM2671-ADJ/NOPB only if system load remains ≤2.5A and sync functionality is omitted; otherwise LM2670T-ADJ/NOPB provides higher current headroom and EMI control. |
| LM2596-ADJ | 3A rated, 40V max input, but fixed 150kHz frequency, no SYNC, higher RDS(ON) (~220mΩ), and wider VFB tolerance (±2.5%). | Better suited for cost-sensitive, non-EMI-critical applications like basic lab supplies or LED drivers where efficiency and frequency control are secondary. | Choose LM2596-ADJ for legacy designs or budget constraints; LM2670T-ADJ/NOPB offers superior efficiency (up to 94%), tighter regulation, and active EMI management via SYNC. |
Compared with LM2671-ADJ/NOPB and LM2596-ADJ, the LM2670T-ADJ/NOPB delivers higher output current (3A vs. 2.5A/3A), tighter output tolerance (±2% vs. ±2%/±2.5%), and unique external synchronization - making it optimal for thermally demanding, EMI-sensitive, or high-precision industrial and communications power designs.
Availability
LM2670T-ADJ/NOPB is available at Aetrix Electronics and suitable for battery chargers, communications equipment, and industrial system preregulators requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2670T-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 LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, high-efficiency, and robustness in industrial, telecom, and embedded power applications without requiring complex compensation or layout expertise.
FAQ
What is the feedback reference voltage of the LM2670T-ADJ/NOPB?
The LM2670T-ADJ/NOPB has a nominal feedback reference voltage (VFB) of 1.21V, with a guaranteed tolerance of ±2% over full temperature, line, and load conditions. This value is used in the resistor divider equation VOUT = 1.21V × (1 + R1/R2) to set the adjustable output voltage. The LM2670T-ADJ/NOPB datasheet specifies this parameter in Section 5.8 under Electrical Characteristics – ADJ.
Does the LM2670T-ADJ/NOPB support external clock synchronization?
Yes, the LM2670T-ADJ/NOPB supports external synchronization via its SYNC pin (Pin 5), accepting TTL/CMOS-compatible clock signals from 280kHz to 400kHz. This feature allows precise control of switching frequency to avoid interference in EMI-sensitive applications such as radio equipment. When SYNC is used, the internal 260kHz oscillator is disabled, and current limit foldback is inactive - a key design consideration for short-circuit protection in the LM2670T-ADJ/NOPB.
What package type is used for the LM2670T-ADJ/NOPB?
The LM2670T-ADJ/NOPB is packaged in the KTW (TO-263-7) thermally enhanced surface-mount package: 10.1mm × 15.24mm outline with an exposed thermal pad that must be soldered to a PCB ground plane. This package is distinct from the NDZ (TO-220-7) and NHM (VSON-14) variants - the LM2670T-ADJ/NOPB specifically uses KTW per TI's official packaging documentation and orderable part number suffix.
What is the maximum output current capability of the LM2670T-ADJ/NOPB?
The LM2670T-ADJ/NOPB is rated for up to 3A continuous output current under recommended operating conditions (TA ≤ 125°C, proper PCB thermal design). Its internal DMOS switch has a typical RDS(ON) of 150mΩ, and current limit is specified from 3.8A (min) to 5.25A (max) across temperature. Actual achievable current depends on input voltage, ambient temperature, and PCB copper area - the LM2670T-ADJ/NOPB datasheet provides thermal resistance data (RθJA = 56°C/W typical for KTW on 0.136 in² copper) to guide thermal design.
How does the ON/OFF pin function on the LM2670T-ADJ/NOPB?
The ON/OFF pin (Pin 7) of the LM2670T-ADJ/NOPB provides logic-level enable control: pulling it below 0.8V places the device in shutdown mode with 50µA typical standby current, while driving it above 1.4V enables normal operation. The pin features an internal ~20µA pull-up current source and a 7V Zener clamp. It must not exceed 6V absolute maximum - a requirement explicitly defined in the LM2670T-ADJ/NOPB Absolute Maximum Ratings table.
LM2670T-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 3A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2670T-ADJ/NOPB FAQ
1.How can I place an order for LM2670T-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670T-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 LM2670T-ADJ/NOPB reliable?
The price and inventory of LM2670T-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 LM2670T-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670T-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670T-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670T-ADJ/NOPB?
LM2670T-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670T-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 LM2670T-ADJ/NOPB?
For technical support, including LM2670T-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670T-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2670T-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670T-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 LM2670T-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670T-ADJ/NOPB?
All LM2670T-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670T-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 LM2670T-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2670T-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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