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Texas Instruments LM2694MTX/NOPB
- Part No.:
- LM2694MTX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2694MTX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,307
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Product details
Overview
LM2694MTX/NOPB from Texas Instruments is a 30V, 600 mA step-down switching regulator with integrated N-channel buck switch, constant on-time control architecture, and no loop compensation required. It operates from 8V–30V input, delivers adjustable output voltage (via FB pin), features valley current limit at 0.62A, and supports up to 1 MHz switching frequency - ideal for high-voltage post-regulation in telecom and industrial power supplies.
For engineers reviewing the LM2694MTX/NOPB datasheet, LM2694MTX/NOPB pinout, LM2694MTX/NOPB application, or LM2694MTX/NOPB equivalent, key selection considerations include its WSON-10 thermally enhanced package, RON/SD programmable on-time control, BST bootstrap capacitor interface, ISEN current-sense terminal, and absence of external compensation components.
Technical Context
The LM2694MTX/NOPB implements a constant on-time (COT) control scheme where tON is determined by VIN and an external RON resistor - enabling stable switching frequency across line and load variations. Its regulation relies on direct comparison of FB voltage against a precision 2.5 V internal reference, with over-voltage protection triggered at 2.9 V.
Current limiting occurs during off-time via valley detection at the ISEN pin, with nominal threshold of 0.62 A and internal 180 mΩ sense resistance. Startup is managed by an integrated 7 V start-up regulator (VCC), which powers internal circuitry and enables gate drive via BST-SW bootstrap capacitor charging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 30 V - supports wide-range industrial and telecom inputs without pre-regulation |
| Output Current Capability | 600 mA continuous - sufficient for point-of-load bias rails in FPGA, DSP, and analog subsystems |
| Switching Frequency | Up to 1 MHz - enables compact magnetics and fast transient response |
| Current Limit Threshold | 0.62 A (valley detection) - provides robust short-circuit protection without foldback |
| Feedback Reference Voltage | 2.5 V ±2% - sets output via resistor divider (R1/R2); low 1 nA bias current minimizes divider error |
| VCC Regulator Output | 7.0 V ±0.4 V - powers internal logic and gate driver; UVLO at 5.7 V ensures clean startup |
| Thermal Shutdown | 175 °C with 20 °C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
LM2694MTX/NOPB is housed in a 3 mm × 3 mm WSON-10 package with exposed thermal pad (EP), optimized for high-power density and thermal performance in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching Node | Source of internal N-channel buck switch; connects to inductor, freewheeling diode, and BST capacitor |
| 2 BST | Bootstrap Supply | Charges via internal diode during off-time; requires 0.022 µF ceramic capacitor to SW for gate drive |
| 3 ISEN | Valley Current Sense | Sinks recirculating inductor current during off-time; sets 0.62 A current limit via internal 180 mΩ resistor |
| 4 SGND | Sense Ground | Return path for ISEN current; must be routed separately from RTN to avoid noise coupling |
| 5 RTN | Circuit Ground | Main ground return for all internal circuitry except current sense; connects to system ground plane |
| 6 FB | Voltage Feedback Input | Compares output voltage (via R1/R2 divider) to 2.5 V reference; requires ≥25 mV ripple for stable operation |
| 7 SS | Soft-Start Control | Internal 12 µA current source charges external capacitor to ramp output voltage; grounded during fault conditions |
| 8 RON/SD | On-Time Programming / Shutdown | Resistor from VIN sets tON; grounding disables regulator and reduces quiescent current to 180 µA |
| 9 VCC | Startup Regulator Output | 7 V regulated supply for internal circuits; can be externally biased to reduce dissipation |
| 10 VIN | Main Input Supply | Accepts 8–30 V; bypassed with low-ESR ceramic capacitor near pin for stability |
Key Features
| Feature | Design Value |
|---|---|
| No external loop compensation required | Eliminates 2–3 passive components and associated stability tuning; simplifies layout and validation |
| Constant on-time control architecture | Maintains stable switching frequency across 8–30 V input and full load range without frequency droop |
| Integrated 7 V start-up regulator | Enables direct connection to high-voltage rails; eliminates need for external bias supply or LDO |
| Valley current limit with 0.62 A threshold | Provides graceful transition to constant-current mode under overload, avoiding destructive peak currents |
| WSON-10 thermally enhanced package | θJA = 33 °C/W (0 LFPM); exposed pad improves heat transfer to PCB ground plane |
Applications
| High-Efficiency Point-of-Load Regulator | Non-Isolated Telecom Buck Regulator |
|---|---|
Use Scenario: Powering FPGA core or I/O banks in base station control cards requiring tight regulation and fast load transients. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering 1.2 V or 3.3 V from 12 V or 24 V intermediate bus. Use Value: Ultra-fast transient response and no-loop-compensation design reduce output capacitance requirements and simplify design iteration. | Use Scenario: Generating 5 V bias rail from 48 V telecom distribution bus in optical line terminals. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator operating continuously at 24–30 V input with >85% efficiency. Use Value: Integrated 30 V N-channel switch and 7 V VCC regulator eliminate external HV MOSFET and auxiliary supply. |
| Secondary High-Voltage Post Regulator | Industrial Sensor Bias Supply |
Use Scenario: Down-converting 24 V or 30 V factory automation bus to 3.3 V for microcontroller and analog front-end. IC Role / Device Role / Timing Role: Robust, self-contained buck regulator with thermal shutdown and current limiting for unattended operation. Use Value: 175 °C thermal shutdown and valley current limit protect against sustained overloads in harsh environments. | Use Scenario: Providing stable 5 V supply to isolated ADCs and precision op-amps in motor drive feedback circuits. IC Role / Device Role / Timing Role: Low-noise, adjustable-output regulator with soft-start to prevent inrush into sensitive analog stages. Use Value: SS pin-controlled ramp-up prevents voltage overshoot and digital latch-up during cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2694MTC/NOPB | TSSOP-14 package; higher θJA (40 °C/W); same electrical specs and pinout mapping except NC pins | Better suited for prototyping or manual assembly; less thermally efficient than WSON-10 | Select when board-level rework or through-hole compatibility is prioritized over thermal performance |
| TPS54202DRCT | 2 A output, 4.5–28 V input, integrated FETs, 2.5 V reference, but requires external compensation and has different control architecture (current-mode) | Higher current capability and wider input range, but increased BOM count and design complexity | Choose when >600 mA load or tighter input voltage margin (down to 4.5 V) is required |
Compared with LM2694MTC/NOPB, LM2694MTX/NOPB offers superior thermal performance in a smaller footprint; compared with TPS54202DRCT, it trades higher current capability for simpler implementation, no compensation, and lower quiescent current in shutdown.
Availability
LM2694MTX/NOPB is available at Aetrix Electronics and suitable for high-voltage post-regulation, telecom POL supplies, and industrial sensor biasing requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2694MTX/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2694MTX/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for cost-sensitive, space-constrained applications needing simple, robust, and efficient step-down conversion from 8–30 V inputs.
FAQ
What is the maximum input voltage rating for LM2694MTX/NOPB?
The absolute maximum input voltage (VIN to RTN) for LM2694MTX/NOPB is 33 V, with recommended continuous operation limited to 8 V–30 V per the datasheet. Exceeding 30 V may trigger overvoltage stress on internal structures, especially during transients. The device includes BST-to-SW and VIN-to-SW absolute maximum ratings of 14 V and 33 V respectively, reinforcing safe operating area constraints defined in SNVS444A.
Does LM2694MTX/NOPB require external compensation components?
No, LM2694MTX/NOPB does not require external compensation components. Its constant on-time control architecture eliminates the need for loop compensation networks, reducing BOM count and simplifying design. Stability is inherently maintained across line and load variations, and the feedback loop uses only the FB pin referenced to the internal 2.5 V comparator - confirmed in the "No Loop Compensation Required" feature list and functional description of SNVS444A.
How is output voltage set on LM2694MTX/NOPB?
Output voltage on LM2694MTX/NOPB is set using a resistor divider (R1 and R2) connected between VOUT, FB, and RTN. The regulated output follows VOUT = 2.5 V × (R1 + R2)/R2. This relationship is derived from the 2.5 V internal reference at the FB pin and is validated across temperature in the Electrical Characteristics table (VREF = 2.44–2.55 V). Minimum FB ripple of 25 mVp-p must be maintained via C2 ESR or added R3.
What is the purpose of the ISEN pin on LM2694MTX/NOPB?
The ISEN pin on LM2694MTX/NOPB serves as the valley current sense terminal during the buck switch off-time. It sinks recirculating inductor current through an internal 180 mΩ resistor, enabling accurate 0.62 A current limit detection. This pin directly interfaces with the freewheeling diode return path and is critical for overload protection - confirmed in Pin Descriptions and Functional Description sections of SNVS444A.
Can LM2694MTX/NOPB be shut down remotely?
Yes, LM2694MTX/NOPB supports remote shutdown via the RON/SD pin. Driving this pin below 0.8 V (typical) disables the buck switch, grounds the SS pin, and reduces quiescent current to ≤180 µA. Release allows automatic resumption of normal operation. This function is explicitly documented in the Electrical Characteristics table (shutdown threshold) and Figure 11 ("Shutdown Implementation") of SNVS444A.
LM2694MTX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm 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):
- 8V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LM2694MTX/NOPB FAQ
1.How can I place an order for LM2694MTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2694MTX/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 LM2694MTX/NOPB reliable?
The price and inventory of LM2694MTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2694MTX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2694MTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2694MTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2694MTX/NOPB?
LM2694MTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2694MTX/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 LM2694MTX/NOPB?
For technical support, including LM2694MTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2694MTX/NOPB requirements.
6.How does Aetrix verify that LM2694MTX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2694MTX/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 LM2694MTX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2694MTX/NOPB?
All LM2694MTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2694MTX/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 LM2694MTX/NOPB part is unused and in its original packaging.
Return procedure for LM2694MTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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