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Texas Instruments LM2670SD-ADJ/NOPB
- Part No.:
- LM2670SD-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2670SD-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:879
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Product details
Overview
LM2670SD-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC/DC switching regulator IC delivering up to 3 A output current with adjustable output voltage (1.2 V to 37 V), 8 V–40 V input range, and 260 kHz fixed-frequency operation. It integrates a 150 mΩ DMOS high-side switch and supports external clock synchronization (280–400 kHz) for EMI control in communications and battery-charger applications.
For engineers reviewing the LM2670SD-ADJ/NOPB datasheet, LM2670SD-ADJ/NOPB pinout, LM2670SD-ADJ/NOPB application, or LM2670SD-ADJ/NOPB equivalent, key selection criteria include feedback voltage tolerance (±2%), standby current (50 µA), thermal shutdown protection, and VSON-14 package compatibility with high-current PCB layouts requiring low RθJA.
Technical Context
The LM2670SD-ADJ/NOPB implements a voltage-mode PWM controller with internal 260 kHz oscillator and external sync capability - enabling precise ripple frequency positioning for RF-sensitive systems. Its high-side DMOS switch features 0.15 Ω typical RDS(ON), supporting >90% efficiency at full load across wide input and temperature ranges (–40°C to 125°C).
Feedback regulation uses a precision 1.21 V reference (±1.2% over temp) with 85 nA bias current, allowing stable output programming via external resistor dividers. The ON/OFF pin provides TTL-compatible enable control with 1.4 V threshold and 20 µA input current, while SYNC pin accepts CMOS/TTL clocks above 280 kHz to override internal timing without compromising loop stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 3 A continuous - supports high-power loads without external current boosting |
| Input voltage range | 8 V to 40 V - enables direct use with 12 V/24 V industrial and automotive supplies |
| Output voltage range | 1.2 V to 37 V (adjustable) - set via external resistor divider on FB pin |
| Feedback reference voltage | 1.21 V ±1.2% - determines output accuracy; sets ±2% overall VOUT tolerance |
| Switch RDS(ON) | 0.15 Ω typical - minimizes conduction loss and thermal rise at 3 A load |
| Standby quiescent current | 50 µA - enables ultra-low-power shutdown for battery-backed systems |
| Oscillator frequency | 260 kHz fixed (or 280–400 kHz sync) - balances efficiency, size, and EMI filtering requirements |
Pinout & Package
LM2670SD-ADJ/NOPB is packaged in a 14-pin VSON (NHM) thermally enhanced leadless package (6 mm × 5 mm) with exposed thermal pad (DAP) tied to GND for optimal heat dissipation. Pin count and layout match TI's NHM footprint standard for automated assembly and thermal reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12–14 | Switch_output | High-side DMOS drain node - connects directly to inductor and Schottky cathode; switches between VIN and ~–0.5 V |
| 2, 3 | Input | Main power input - supplies both load path and internal bias; requires low-ESR bypass capacitor within 5 mm |
| 4 | CBOOST/CB | Bootstrap capacitor connection - 100 nF ceramic cap between CB and SW ensures full gate drive for low RDS(ON) |
| 9 | GND | Power ground - must be connected to thermal pad and system ground plane for thermal and noise performance |
| 6 | SYNC | External clock input - accepts 280–400 kHz TTL/CMOS signal to fix switching frequency and control ripple spectrum |
| 7 | Feedback/FB | Voltage sense input - compares divided output against 1.21 V reference to regulate VOUT precisely |
| 8 | ON/OFF | Enable control - <0.8 V disables regulator; >1.4 V enables; internal 20 µA pull-up simplifies logic interfacing |
| 1, 5, 10, 11 | NC | No-connect - left unconnected per datasheet; no internal circuitry attached |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150 mΩ DMOS switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity |
| ±2% output voltage tolerance | Guaranteed over full line, load, and temperature range - reduces need for post-regulation trimming |
| External clock synchronization | Enables deterministic EMI placement and consistent filter design across multiple boards or systems |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating without external sensing components |
| WEBENCH® Power Designer support | Generates complete schematics, BOMs, and performance simulations using real component models |
Applications
| Industrial Power Preregulator | Battery Charger Supply |
|---|---|
|
Use Scenario: Provides stable 5 V or 12 V intermediate rail from unregulated 24 V factory bus to feed linear regulators or analog circuitry. IC Role / Device Role / Timing Role: Primary buck converter regulating high-current intermediate voltage with minimal dropout and ripple. Use Value: Delivers >90% efficiency at 3 A, reducing heat sink requirements and improving system thermal margin versus linear solutions. |
Use Scenario: Generates programmable charging voltage (e.g., 16.8 V for 4S Li-ion) from 24 V vehicle supply in portable tool chargers. IC Role / Device Role / Timing Role: Adjustable-output buck controller with precise feedback reference enabling accurate constant-voltage charge termination. Use Value: 1.21 V ±1.2% reference and ±2% total output tolerance ensure cell voltage compliance within ±50 mV across temperature. |
| Communications Equipment Power | RF Transceiver Bias Supply |
|
Use Scenario: Powers baseband processor and interface ICs in cellular infrastructure units where EMI must avoid LTE bands. IC Role / Device Role / Timing Role: Synchronized buck regulator locked to system clock to position switching noise outside critical receive bands. Use Value: External SYNC pin allows fixed 320 kHz operation - placing fundamental ripple and harmonics away from 700 MHz–2.6 GHz bands. |
Use Scenario: Supplies clean, low-noise 3.3 V bias to RF power amplifiers and LNA stages in software-defined radios. IC Role / Device Role / Timing Role: High-efficiency buck converter with low standby current and fast transient response for burst-mode transmission. Use Value: 50 µA shutdown current extends battery life during idle; 3 A capability handles PA peak current surges without droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671SD-5.0/NOPB | Fixed 5 V output; identical pinout, package, and specs except FB pin internally tied to divider | Eliminates external resistors but lacks output flexibility - suitable only where 5 V is mandatory | Select when fixed output simplifies layout and eliminates tuning risk; not adjustable |
| TPS54302DDAR | 3 A synchronous buck with 4.5–28 V input, 0.8–28 V output, and 2.5 V reference; smaller SO-8 package | Higher integration (integrated low-side FET) but lower max input voltage and no SYNC pin | Choose for space-constrained designs needing sync-free operation below 28 V input |
Compared with LM2670SD-ADJ/NOPB, LM2671SD-5.0/NOPB trades adjustability for resistor-free simplicity and identical thermal performance, while TPS54302DDAR offers synchronous rectification and smaller footprint at the cost of missing external clock control and reduced input voltage headroom.
Availability
LM2670SD-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power preregulators, battery charger supplies, communications equipment power, and RF transceiver bias supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2670SD-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 technologies, with decades of leadership in high-reliability power conversion ICs.
The LM2670 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in non-isolated DC/DC buck applications where high efficiency, thermal robustness, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for LM2670SD-ADJ/NOPB?
The absolute maximum input voltage for LM2670SD-ADJ/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding safe operating area limits and may trigger internal protection circuits. TI specifies 40 V as the upper limit for reliable continuous operation across –40°C to 125°C junction temperature.
How does the SYNC pin function in LM2670SD-ADJ/NOPB?
The SYNC pin on LM2670SD-ADJ/NOPB accepts an external TTL/CMOS clock (280–400 kHz) to override the internal 260 kHz oscillator. When driven, it forces exact switching frequency alignment - enabling consistent EMI filtering and spectral positioning. The internal ramp oscillator resets on each rising edge, and SYNC must exceed 280 kHz to prevent erratic behavior.
What is the feedback reference voltage of LM2670SD-ADJ/NOPB and how is it used?
LM2670SD-ADJ/NOPB uses a precision 1.21 V ±1.2% internal reference connected to the FB pin. To set output voltage, a resistor divider (R1–R2) connects from VOUT to FB to GND so that VFB = 1.21 V. This yields VOUT = 1.21 V × (1 + R1/R2), enabling accurate adjustment from 1.2 V to 37 V.
Does LM2670SD-ADJ/NOPB require an external Schottky diode?
Yes - LM2670SD-ADJ/NOPB requires an external Schottky diode connected from the Switch_output pin to output ground. The IC integrates only the high-side DMOS switch; the diode provides the return path during switch-off. TI recommends 3 A+ Schottky diodes with <0.5 V forward drop (e.g., SS34, SB560) to maintain >90% efficiency at full load.
What thermal performance can be expected from LM2670SD-ADJ/NOPB in the VSON package?
In the NHM (VSON-14) package, LM2670SD-ADJ/NOPB achieves RθJA = 55°C/W with minimal copper and 29°C/W with 12 vias to inner ground layer. With proper thermal pad soldering to ≥1 in² of 1 oz copper, it sustains 3 A continuous output at 125°C junction temperature under 40 V input - verified per TI's AN-1187 layout guidelines.
LM2670SD-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- 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):
- 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:
- 14-VSON (5x6)
LM2670SD-ADJ/NOPB FAQ
1.How can I place an order for LM2670SD-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SD-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 LM2670SD-ADJ/NOPB reliable?
The price and inventory of LM2670SD-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 LM2670SD-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670SD-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SD-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SD-ADJ/NOPB?
LM2670SD-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SD-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 LM2670SD-ADJ/NOPB?
For technical support, including LM2670SD-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SD-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2670SD-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670SD-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 LM2670SD-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670SD-ADJ/NOPB?
All LM2670SD-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SD-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 LM2670SD-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2670SD-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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