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Texas Instruments LM2694SDX/NOPB
- Part No.:
- LM2694SDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2694SDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,257
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Product details
Overview
LM2694SDX/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 resistor divider feedback (2.5 V reference), and features valley current limit at 0.62 A - used in high-voltage POL regulation for telecom secondary power supplies.
For engineers reviewing the LM2694SDX/NOPB datasheet, LM2694SDX/NOPB pinout, LM2694SDX/NOPB application, or LM2694SDX/NOPB equivalent, key selection criteria include input voltage range (8–30 V), no-loop-compensation design, thermal shutdown (175 °C), WSON-10 package with exposed pad, and RON/SD programmable on-time control.
Technical Context
The LM2694SDX/NOPB implements a constant-on-time (COT) control scheme where on-time is determined by VIN and external RON resistor, enabling stable switching frequency across line and load variations. Its regulation relies on a 2.5 V internal reference compared at FB, with no external compensation required.
It integrates a self-biased start-up regulator (VCC = 7.0 V, ±0.4 V), valley current sensing via ISEN/SGND (0.62 A threshold), and bootstrap gate drive (BST–SW capacitor = 0.022 µF). Thermal shutdown activates at 175 °C with 20 °C hysteresis, and gate-drive UVLO triggers at BST–SW < 3.0 V.
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 | Up to 600 mA - sufficient for point-of-load bias rails in FPGA, DSP, and analog subsystems |
| Switching Frequency | ~1 MHz max - enables compact magnetics and low-profile designs |
| Current Limit Threshold | 0.62 A (valley-sensed) - provides short-circuit protection without foldback, ensuring smooth transition to constant-current mode |
| Feedback Reference | 2.5 V ±1.2% - sets output voltage via external resistive divider (VOUT = 2.5 × (R1 + R2)/R2) |
| Thermal Shutdown | 175 °C activation - protects against sustained overload or poor heatsinking in enclosed systems |
| VCC Regulator Output | 7.0 V ±0.4 V - powers internal circuitry; externally bypassed with ≥0.1 µF ceramic capacitor |
Pinout & Package
LM2694SDX/NOPB is housed in a thermally enhanced 10-pin WSON package (3 mm × 3 mm) with exposed pad (EP) for PCB ground connection to improve thermal performance. Pin numbering follows TI's DSC0010A standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching Node | Connects to inductor, freewheeling diode cathode, and BST capacitor - carries high dv/dt switching current |
| 2 BST | Bootstrap Supply | Accepts 0.022 µF capacitor from SW - sustains gate drive voltage during high-side switch conduction |
| 3 ISEN | Valley Current Sense Output | Sinks recirculating inductor current during off-time - used to detect 0.62 A current limit |
| 4 SGND | Current Sense Ground | Return path for ISEN current - must be routed separately from power ground to avoid noise coupling |
| 5 RTN | Circuit Ground | Main ground return for control circuitry - connects to system ground plane near EP |
| 6 FB | Feedback Input | Compares output voltage (via resistor divider) to 2.5 V reference - no external compensation needed |
| 7 SS | Softstart Control | Charged by 12 µA internal current source - controls output ramp rate and reduces inrush stress |
| 8 RON/SD | On-Time Programming / Shutdown | Resistor to VIN sets on-time; grounding disables regulator and resets softstart |
| 9 VCC | Start-Up Regulator Output | 7 V regulated supply for internal logic - requires ≥0.1 µF local ceramic bypass |
| 10 VIN | Main Input Supply | 8–30 V input - bypassed with low-ESR ceramic capacitor close to pin and RTN |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Enables immediate implementation with only R1/R2 feedback divider - eliminates stability analysis and tuning effort |
| Ultra-fast transient response | Constant-on-time architecture responds within one switching cycle to load steps - critical for digital core rail regulation |
| Integrated start-up regulator | Self-biases internal circuitry from VIN up to 30 V - removes need for external bias supply or LDO |
| Valley current limiting | Detects peak inductor current indirectly during off-time - avoids false triggering from switching noise |
| Thermally enhanced WSON-10 | θJA = 33 °C/W (0 LFPM) - allows >0.6 A operation at ambient ≤85 °C with minimal copper area |
Applications
| Telecom Secondary Post-Regulator | High-Voltage Point-of-Load Supply |
|---|---|
Use Scenario: Regulating 24 V or 48 V intermediate bus down to 3.3 V or 5 V for line-card processors and interface ICs in optical transport equipment. IC Role / Device Role / Timing Role: Primary DC-DC buck controller providing isolated secondary-side bias with fast transient recovery after burst-mode traffic loads. Use Value: Eliminates need for external compensation and reduces BOM count by integrating VCC regulator, gate driver, and current sense. | Use Scenario: Powering FPGA I/O banks or analog front-ends requiring stable 1.2 V–5 V rails from unregulated 12 V–28 V industrial supplies. IC Role / Device Role / Timing Role: Standalone step-down regulator delivering up to 600 mA with fixed 2.5 V reference and programmable on-time. Use Value: Achieves >85% efficiency at full load while maintaining <1% output voltage deviation under 100 mA–600 mA dynamic load steps. |
| Non-Isolated Buck Bias Supply | Industrial Sensor Signal Chain Power |
Use Scenario: Generating clean 3.3 V bias for microcontrollers and communication transceivers in PLC modules powered from 24 V DC field buses. IC Role / Device Role / Timing Role: Compact, high-input-voltage buck converter operating in continuous conduction mode at typical loads. Use Value: Supports wide input range (8–30 V) and withstands 33 V transients - suitable for harsh industrial environments. | Use Scenario: Supplying precision ADCs, op-amps, and temperature sensors in battery-backed or energy-harvesting IoT nodes. IC Role / Device Role / Timing Role: Low-quiescent, high-efficiency regulator with shutdown control (RON/SD) for duty-cycled operation. Use Value: Delivers 600 mA peak current while consuming only 90–180 µA in shutdown - extends battery life in intermittent-sensing applications. |
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); identical electrical specs and pinout mapping except NC pins | Requires larger PCB footprint and has higher thermal resistance - less suitable for space-constrained or high-ambient designs | Select when board layout favors TSSOP or existing footprint compatibility is required |
| TPS54202DRCT | 4.5–28 V input; 2 A output; integrated FETs; 500 kHz–2.2 MHz adjustable frequency; requires external compensation | Higher current capability but narrower input range; more complex loop design; different startup behavior | Choose for higher output current needs or when programmable frequency and soft-start delay are mandatory |
Compared with LM2694MM/NOPB, the LM2694SDX/NOPB offers superior thermal performance in a smaller footprint; versus TPS54202DRCT, it trades higher current and frequency flexibility for simpler design, no compensation, and wider input voltage support - making it optimal for fixed-output, high-reliability 8–30 V applications.
Availability
LM2694SDX/NOPB is available at Aetrix Electronics and suitable for telecom secondary regulators, industrial POL supplies, and non-isolated buck bias applications requiring stable component supply across multi-year production cycles.
Supply support for LM2694SDX/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 LM2694SDX/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for efficient, low-component-count DC-DC conversion in telecom, industrial, and automotive auxiliary power systems.
FAQ
What is the maximum input voltage rating for the LM2694SDX/NOPB?
The LM2694SDX/NOPB has an absolute maximum VIN-to-RTN rating of 33 V, with recommended operating range of 8 V to 30 V. Exceeding 33 V risks permanent damage. The device includes internal protection against transient overvoltage, but sustained operation above 30 V is not specified or guaranteed. Always verify input filtering and clamping in systems with potential surges.
Does the LM2694SDX/NOPB require external compensation components?
No, the LM2694SDX/NOPB uses a constant-on-time control architecture that eliminates the need for external compensation networks. Its feedback loop stabilizes inherently through the relationship between input voltage, on-time programming resistor (RON), and output ripple - enabling robust regulation with only R1/R2 for voltage setting and C6 for softstart.
How is the output voltage set on the LM2694SDX/NOPB?
The output voltage of the LM2694SDX/NOPB is set using a resistive divider (R1 and R2) connected between VOUT, FB, and RTN. The internal 2.5 V reference at FB yields VOUT = 2.5 × (R1 + R2)/R2. Standard 1% resistors in the 1–10 kΩ range are recommended; for example, R1 = R2 = 2.5 kΩ sets VOUT = 5 V.
What is the purpose of the ISEN and SGND pins on the LM2694SDX/NOPB?
The ISEN pin sinks recirculating inductor current during the buck switch off-time, enabling valley current limit detection at 0.62 A. SGND is the dedicated return path for this current - it must be routed separately from RTN to prevent noise injection into the control circuitry. Together, they implement accurate, noise-immune current limiting without additional sense resistors.
Can the LM2694SDX/NOPB be shut down remotely, and how?
Yes, the LM2694SDX/NOPB supports remote shutdown via the RON/SD pin. Driving this pin below 0.8 V (typically to ground) disables the buck switch, grounds the SS pin, and reduces quiescent current to 90–180 µA. Releasing the pin allows automatic resumption of normal operation after softstart ramp. No external pull-up is required - internal bias maintains ~1.5–3.0 V during active operation.
LM2694SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 10-WSON (3x3)
LM2694SDX/NOPB FAQ
1.How can I place an order for LM2694SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2694SDX/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 LM2694SDX/NOPB reliable?
The price and inventory of LM2694SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2694SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2694SDX/NOPB?
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4.How is shipping managed for LM2694SDX/NOPB?
LM2694SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2694SDX/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 LM2694SDX/NOPB?
For technical support, including LM2694SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2694SDX/NOPB requirements.
6.How does Aetrix verify that LM2694SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2694SDX/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 LM2694SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2694SDX/NOPB?
All LM2694SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2694SDX/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 LM2694SDX/NOPB part is unused and in its original packaging.
Return procedure for LM2694SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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