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Texas Instruments LM2694MT/NOPB
- Part No.:
- LM2694MT/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2694MT/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:141
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Product details
Overview
LM2694MT/NOPB from Texas Instruments is a 30V, 600 mA step-down switching regulator with integrated N-channel buck switch and constant-on-time control architecture. It operates from 8V to 30V input, delivers adjustable output voltage via external resistors, and features valley current limiting at 0.62A - used in high-voltage post-regulation for telecom power supplies.
For engineers reviewing the LM2694MT/NOPB datasheet, LM2694MT/NOPB pinout, LM2694MT/NOPB application, or LM2694MT/NOPB equivalent, key selection considerations include its no-loop-compensation design, 1 MHz max switching frequency, WSON-10 thermally enhanced package, and shutdown control via RON/SD pin.
Technical Context
The LM2694MT/NOPB employs a constant-on-time control scheme where on-time is set by VIN and an external RON resistor, enabling stable switching frequency across line and load variations. Its feedback regulation uses a 2.5V internal reference at the FB pin without external compensation components.
It integrates a start-up regulator (VCC = 7.0V ±0.4V), gate drive UVLO (4.4V threshold), thermal shutdown (175°C), and valley current limit detection (0.62A nominal) that transitions smoothly into constant-current mode during overload - all implemented within a single WSON-10 package with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 30V - supports wide-range industrial and telecom inputs without pre-regulation |
| Output Current | 600 mA continuous - sufficient for point-of-load bias rails in FPGA/CPU auxiliary supplies |
| Switching Frequency | Up to 1 MHz - enables compact magnetics and fast transient response |
| Current Limit Threshold | 0.62 A - provides robust short-circuit protection with valley-sensing architecture |
| Feedback Reference | 2.5 V - sets output voltage via R1/R2 divider; low 1 nA bias current minimizes divider error |
| VCC Regulator Output | 7.0 V ±0.4 V - powers internal circuitry; includes 9 mA current limit and 5.7 V UVLO |
| Thermal Shutdown | 175°C activation - protects against sustained overloads; 20°C hysteresis ensures clean recovery |
| Package | WSON-10 (3 mm × 3 mm) with exposed pad - achieves θJA = 33°C/W for high-power-density layouts |
Pinout & Package
LM2694MT/NOPB is housed in a thermally enhanced 10-pin WSON package (package code DSC0010A) with an exposed metal pad for PCB-level heat dissipation. The pinout is validated per TI SNVS444A Rev. April 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching Node | Connects to inductor, freewheeling diode, and bootstrap capacitor; carries high dv/dt switching current |
| 2 BST | Bootstrap Supply | Accepts 0.022 µF capacitor from SW to enable high-side N-MOSFET gate drive |
| 3 ISEN | Current Sense Output | Sinks recirculating inductor current during off-time; sets 0.62A valley current limit |
| 4 SGND | Sense Ground | Return path for current sense resistor; must be isolated from power ground to avoid noise coupling |
| 5 RTN | Circuit Ground | Main ground return for internal logic, regulation comparators, and softstart circuitry |
| 6 FB | Feedback Input | Compares output voltage (via R1/R2) to 2.5V reference; requires ≥25 mVpp ripple for stability |
| 7 SS | Softstart Control | Internal 12 µA current source charges external capacitor to ramp output voltage gradually |
| 8 RON/SD | On-Time Set / Shutdown | Resistor from VIN sets on-time; grounding disables regulator and resets softstart |
| 9 VCC | Startup Regulator Output | 7.0V regulated supply for internal circuits; can be externally biased to reduce dissipation |
| 10 VIN | Main Input Supply | Accepts 8–30V input; bypassed with ceramic capacitor near pin for EMI suppression |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Eliminates external compensation network, reducing BOM count and layout sensitivity |
| Ultra-fast transient response | Constant-on-time control enables sub-microsecond recovery from load steps without phase-margin tuning |
| Adjustable output voltage | Set via external R1/R2 divider; supports 2.5V to >24V outputs depending on resistor ratio |
| Valley current limit at 0.62A | Prevents destructive peak currents during short-circuit while maintaining predictable foldback behavior |
| Integrated start-up regulator | Generates 7V VCC directly from VIN, enabling direct connection to 30V rail without external bias supply |
| Thermally enhanced WSON-10 | Exposed pad lowers junction-to-board thermal resistance to 8.8°C/W, supporting 600 mA at 125°C ambient |
Applications
| Telecom Secondary Post-Regulator | High-Voltage POL Bias Supply |
|---|---|
Use Scenario: Regulates 24V intermediate bus down to 5V/3.3V for line card ASICs in optical transport equipment. IC Role / Device Role / Timing Role: Primary DC-DC converter providing isolated secondary-side bias with fast transient immunity. Use Value: Constant-on-time control maintains regulation during burst-mode traffic loads; 30V rating avoids need for pre-regulator stage. | Use Scenario: Powers FPGA configuration banks and transceiver analog supplies in industrial PLC backplanes. IC Role / Device Role / Timing Role: Non-isolated buck regulator delivering stable 1.2V/1.8V rails from 12V or 24V system bus. Use Value: Valley current limit prevents latch-up during hot-swap events; WSON-10 footprint saves board space in dense modules. |
| Non-Isolated Telecom Buck Converter | High-Efficiency Point-of-Load Regulator |
Use Scenario: Generates -5V/-12V bias for op-amps and interface ICs using inverting topology with external diode. IC Role / Device Role / Timing Role: Core switching controller implementing inverting buck-boost with synchronous rectification capability. Use Value: Adjustable on-time via RON resistor allows optimization of efficiency vs. EMI across 8–30V input range. | Use Scenario: Supplies 0.6A at 3.3V to microcontroller subsystems in battery-backed smart meters. IC Role / Device Role / Timing Role: Efficient step-down regulator operating in discontinuous conduction mode at light loads. Use Value: No-loop-compensation design simplifies qualification; thermal shutdown ensures reliability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2694MM/NOPB | TSSOP-14 package (θJA = 40°C/W); same electrical specs and pinout mapping except NC pins | Better suited for prototyping or through-hole assembly; larger footprint but easier manual soldering | Select LM2694MM/NOPB when thermal margin exceeds 10°C or board rework is anticipated |
| TPS54202DRT | 2.5–17V input, 2A output, integrated FETs; uses current-mode control with external compensation | Higher current capacity but narrower input range; requires loop compensation and has different transient profile | Choose TPS54202DRT only if >600 mA load or <8V minimum input is required |
Compared with LM2694MM/NOPB, LM2694MT/NOPB offers superior thermal performance in space-constrained designs; versus TPS54202DRT, it trades higher current capability for wider input range, no-compensation simplicity, and proven robustness in 30V telecom environments.
Availability
LM2694MT/NOPB is available at Aetrix Electronics and suitable for telecom power supplies, industrial PLCs, and high-voltage point-of-load regulators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2694MT/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 headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and communications markets.
The LM2694MT/NOPB belongs to TI's high-voltage DC-DC regulator product line, engineered specifically for efficient, compact, and reliable step-down conversion in 8–30V input systems where simplicity and thermal performance are critical.
FAQ
What is the maximum input voltage rating for LM2694MT/NOPB?
The LM2694MT/NOPB has an absolute maximum input voltage (VIN to RTN) of 33V, with recommended operating range from 8V to 30V. Exceeding 30V may trigger overvoltage stress on internal structures; operation above 33V risks permanent damage. The device includes BST-to-SW and VIN-to-SW absolute ratings of 14V and 33V respectively to protect the integrated N-channel switch.
Does LM2694MT/NOPB require external compensation components?
No, LM2694MT/NOPB does not require external compensation components. Its constant-on-time control architecture eliminates the need for loop compensation networks, simplifying design and improving transient response. Stability is inherently maintained across input voltage and load variations, as confirmed in TI SNVS444A Section 8.2.2 and Figure 6.
How is output voltage adjusted on LM2694MT/NOPB?
Output voltage on LM2694MT/NOPB is adjusted using two external resistors (R1 and R2) forming a voltage divider from VOUT to FB. The formula is VOUT = 2.5 × (R1 + R2)/R2. For example, R1 = R2 = 2.5 kΩ yields 5V output. The FB pin draws only 1 nA bias current, minimizing divider error and enabling use of high-value resistors to reduce quiescent current.
What thermal performance can be expected from LM2694MT/NOPB in a typical layout?
In a standard 4-layer PCB with 2 oz copper and full thermal pad connection, LM2694MT/NOPB achieves θJA = 33°C/W. At 600 mA load and 24V input, junction temperature rise is approximately 50°C above ambient - well within the −40°C to +125°C operating range. Thermal shutdown activates at 175°C with 20°C hysteresis, ensuring safe recovery after overload conditions.
Can LM2694MT/NOPB be shut down remotely?
Yes, LM2694MT/NOPB supports remote shutdown via the RON/SD pin. Pulling this pin below 0.8V disables the buck switch, grounds the SS pin, and reduces bias current to 90–180 µA. Releasing the pin restores normal operation after softstart. This function is verified in Electrical Characteristics Table (shutdown threshold = 0.45–1.2V) and Functional Description Section 8.3.5.
LM2694MT/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- 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):
- 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
LM2694MT/NOPB FAQ
1.How can I place an order for LM2694MT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2694MT/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 LM2694MT/NOPB reliable?
The price and inventory of LM2694MT/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2694MT/NOPB is usually 5 days.
3.What payment methods are accepted for LM2694MT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2694MT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2694MT/NOPB?
LM2694MT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2694MT/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 LM2694MT/NOPB?
For technical support, including LM2694MT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2694MT/NOPB requirements.
6.How does Aetrix verify that LM2694MT/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2694MT/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 LM2694MT/NOPB meets industry standards.
7.What is the process for return or replacement of LM2694MT/NOPB?
All LM2694MT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2694MT/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 LM2694MT/NOPB part is unused and in its original packaging.
Return procedure for LM2694MT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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