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Texas Instruments LM2670S-ADJ/NOPB
- Part No.:
- LM2670S-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2670S-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:774
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Product details
Overview
LM2670S-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC converter IC delivering up to 3A output current with adjustable output voltage (1.2V–37V), 8V–40V input range, 260kHz fixed switching frequency, and 150mΩ internal DMOS high-side switch - used in battery chargers, communications power supplies, and system preregulators.
For engineers reviewing the LM2670S-ADJ/NOPB datasheet, LM2670S-ADJ/NOPB pinout, LM2670S-ADJ/NOPB application, or LM2670S-ADJ/NOPB equivalent, key selection criteria include feedback voltage tolerance (±2%), standby current (50µA), sync capability (280–400kHz), thermal shutdown, and ON/OFF control interface for power sequencing.
Technical Context
The LM2670S-ADJ/NOPB implements a voltage-mode PWM controller with an internal 260kHz oscillator and external sync input (pin 5), enabling precise ripple frequency positioning for EMI-sensitive radio equipment. Its high-side DMOS switch features 150mΩ RDS(ON) at TJ = 25°C, supporting >90% efficiency across load and line conditions.
Feedback regulation uses a precision 1.21V reference (±1.2% over temperature) sensed at pin 6; output voltage is set via external resistor divider. The device operates from –40°C to +125°C junction temperature and includes thermal shutdown, cycle-by-cycle current limiting (3.6–5.4A), and 1.4V ON/OFF threshold with 20µA input bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | Up to 3A continuous - supports high-power embedded systems without external current boosting. |
| Input voltage range | 8V to 40V - compatible with 12V/24V industrial rails and wide-range battery inputs. |
| Adjustable VOUT | 1.2V to 37V - enables flexible system-level voltage scaling using two external resistors. |
| Feedback reference | 1.21V ±1.2% - ensures ±2% output tolerance over full line, load, and temperature range. |
| Switch RDS(ON) | 0.15Ω typical - minimizes conduction loss and enables >90% efficiency at 3A loads. |
| Standby current | 50µA max - allows ultra-low-power shutdown mode for battery-backed applications. |
| Sync frequency range | 280kHz to 400kHz - permits EMI filtering alignment and avoids sensitive RF bands. |
Pinout & Package
LM2670S-ADJ/NOPB is supplied in the KTW (TO-263-7) thermally enhanced package: 10.1mm × 15.24mm outline with exposed thermal pad soldered to PCB ground plane for optimal thermal performance (RθJA = 35°C/W with 0.4896 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal high-side DMOS - connects directly to inductor and Schottky diode cathode; switches between VIN and ~–0.5V. |
| 2 (VIN) | Input supply | Main power input (8–40V); requires low-ESR bypass capacitor placed adjacent to pin for stable high-frequency operation. |
| 3 (CBOOST) | Bootstrap capacitor | Connects to SW via 100nF ceramic capacitor - provides gate drive voltage >VIN to fully enhance internal MOSFET. |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and thermal pad - must be low-inductance connection to system ground plane. |
| 5 (SYNC) | External clock input | Accepts TTL/CMOS clock (280–400kHz); overrides internal 260kHz oscillator for EMI-controlled ripple frequency placement. |
| 6 (FB) | Feedback sense | High-impedance input (85nA bias) referenced to 1.21V - sets output voltage via resistor divider; open for fixed-output variants. |
| 7 (ON/OFF) | Enable control | Logic-level input (1.4V threshold); pulls low to disable regulator and reduce quiescent current to 50µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS switch | 150mΩ RDS(ON) eliminates need for external MOSFET and driver, reducing BOM count and layout complexity. |
| External synchronization | Enables deterministic ripple frequency control - critical for meeting CISPR-22/EN55022 conducted EMI limits in comms equipment. |
| Precision feedback reference | 1.21V ±1.2% over –40°C to +125°C ensures stable output regulation without trimming or calibration. |
| Thermal shutdown & current limit | Protects against overload and ambient overheating - automatically recovers after fault removal without latch-up. |
| WEBENCH® design integration | TI's online tool generates complete schematics, bill-of-materials, and performance simulations using real component models. |
Applications
| Battery Charger Power Stage | Communications Equipment Preregulator |
|---|---|
Use Scenario: Step-down conversion from 24V bus to 14.4V for Li-ion battery charging circuitry in portable test equipment. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, current-limited DC output; synchronous clock input aligns ripple with baseband processing clocks. Use Value: 50µA shutdown current extends standby battery life; 3A capability supports fast-charge profiles without external pass devices. | Use Scenario: Pre-regulating 48V telecom supply down to 12V for downstream LDOs powering RF transceivers and FPGAs. IC Role / Device Role / Timing Role: High-efficiency intermediate stage converter; external SYNC locks switching frequency to avoid interference with 2.4GHz/5GHz ISM bands. Use Value: 94% peak efficiency reduces heat dissipation in dense telecom modules; ±2% output tolerance maintains clean LDO input headroom. |
| Industrial PLC Power Supply | Automotive Diagnostic Tool Power |
Use Scenario: Converting 24V vehicle or factory bus to 5V/3.3V for microcontroller and I/O logic in programmable logic controllers. IC Role / Device Role / Timing Role: Main DC-DC converter with ON/OFF control synchronized to system wake-up signals; thermal shutdown prevents field failures under enclosure overheating. Use Value: Wide 8–40V input accommodates cold-crank and load-dump transients; TO-263 package enables robust thermal management on 2oz copper PCBs. | Use Scenario: Powering handheld OBD-II diagnostic tools from 12V automotive battery with automatic shutdown during ignition-off periods. IC Role / Device Role / Timing Role: Standby-aware buck regulator activated only when CAN bus activity is detected; FB pin monitors output for brown-out detection. Use Value: 50µA quiescent current prevents battery drain during weeks of storage; 125°C junction rating supports under-hood ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ/NOPB | Lower 1.5A output current; 150kHz fixed frequency; no SYNC input; higher RDS(ON) (220mΩ). | Suitable for cost-sensitive, lower-current designs where EMI control is less critical. | Select when 3A output and sync capability are not required - reduces BOM cost but sacrifices efficiency and noise control. |
| TPS54302DDCR | 3A output; 2.5V–28V input; integrated compensation; no external SYNC; smaller 8-pin SOIC package. | Better suited for space-constrained designs needing simplified loop compensation, but lacks frequency alignment for EMI filtering. | Choose for compact layouts and faster design cycles using internal compensation - trade-off is loss of external ripple frequency control. |
Compared with LM2596S-ADJ/NOPB and TPS54302DDCR, the LM2670S-ADJ/NOPB uniquely combines 3A capability, external SYNC, and TO-263 thermal performance - making it optimal for industrial and communications applications requiring deterministic EMI behavior and robust thermal handling.
Availability
LM2670S-ADJ/NOPB is available at Aetrix Electronics and suitable for battery charger power stages, communications equipment preregulators, and industrial PLC power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2670S-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 company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability power conversion solutions.
The LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, high-efficiency buck conversion in industrial, communications, and battery-powered systems without requiring complex compensation networks.
FAQ
What is the maximum output voltage range supported by the LM2670S-ADJ/NOPB?
The LM2670S-ADJ/NOPB supports an adjustable output voltage range from 1.2V to 37V, set by an external resistor divider connected to the FB pin. This range is validated across the full operating temperature range (–40°C to +125°C) and input voltage range (8V to 40V), with output tolerance held to ±2% under all line and load conditions per the datasheet specifications.
Does the LM2670S-ADJ/NOPB require an external bootstrap capacitor, and what value is recommended?
Yes, the LM2670S-ADJ/NOPB requires a 100nF ceramic capacitor connected between the CBOOST (pin 3) and SW (pin 1) terminals. This capacitor provides gate-drive voltage above VIN to fully enhance the internal high-side DMOS switch. TI specifies this value in Section 6.3.3 and confirms its use across all operating conditions - deviation may cause reduced efficiency or startup failure.
How does the SYNC function affect protection features in the LM2670S-ADJ/NOPB?
When the SYNC pin is actively driven (280–400kHz), current limit frequency foldback is disabled per Section 6.3.5. This means the LM2670S-ADJ/NOPB retains overcurrent shutdown but loses dynamic foldback behavior during sustained short-circuit events. Designers must ensure external protection (e.g., fuse, current-sense IC) is added if full short-circuit robustness is required in synchronized mode.
What is the thermal resistance (RθJA) of the LM2670S-ADJ/NOPB in its KTW package under standard PCB layout?
In the KTW (TO-263-7) package, the LM2670S-ADJ/NOPB achieves RθJA = 35°C/W when mounted on a PCB with 0.4896 in² (3.6× package area) of 1 oz copper - as specified in Table 5.4. This value assumes direct thermal pad soldering to the ground plane; omitting the thermal pad or reducing copper area increases junction temperature significantly.
Can the LM2670S-ADJ/NOPB operate with input voltages below 8V?
No - the absolute minimum recommended input voltage for the LM2670S-ADJ/NOPB is 8V, as defined in Section 5.3. Operation below this violates recommended operating conditions and may result in unstable regulation, failure to start, or undefined behavior. The device is not characterized or guaranteed for sub-8V operation, even briefly during cold-crank transients.
LM2670S-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2670S-ADJ/NOPB FAQ
1.How can I place an order for LM2670S-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670S-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 LM2670S-ADJ/NOPB reliable?
The price and inventory of LM2670S-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 LM2670S-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670S-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670S-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670S-ADJ/NOPB?
LM2670S-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670S-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 LM2670S-ADJ/NOPB?
For technical support, including LM2670S-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670S-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2670S-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670S-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 LM2670S-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670S-ADJ/NOPB?
All LM2670S-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670S-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 LM2670S-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2670S-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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