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Texas Instruments LM2695SDX/NOPB
- Part No.:
- LM2695SDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM2695SDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,525
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Product details
Overview
LM2695SDX/NOPB from Texas Instruments is a high-voltage, 30V-input, 1.25A valley-current-mode synchronous buck switching regulator with integrated 33V N-channel MOSFET switch and self-biasing startup regulator. It operates across 8V–30V input, delivers adjustable output via resistor divider (2.5V internal reference), and targets point-of-load regulation in telecom secondary supplies and industrial high-voltage post-regulation.
For engineers reviewing the LM2695SDX/NOPB datasheet, LM2695SDX/NOPB pinout, LM2695SDX/NOPB application, or LM2695SDX/NOPB equivalent, key selection criteria include its hysteretic control architecture (no loop compensation), fixed 250 ns minimum off-time, 1.25A valley current limit, 7.0V VCC startup regulator, and WSON-10 thermal pad package for high-power-density designs.
Technical Context
The LM2695SDX/NOPB implements a hysteretic on-time control scheme where switching frequency remains stable across line and load variations due to inverse VIN–tON relationship. Its regulation relies on FB voltage comparison against a 2.5V internal reference, with overvoltage protection triggered at 2.9V.
Current limiting occurs during off-time by sensing recirculating current through ISEN/SGND (130 mΩ internal sense resistor), holding the switch off until current falls below 1.25A. Thermal shutdown activates at 175°C with 20°C hysteresis, and gate drive UVLO ensures reliable switching above 4.4V BST–SW differential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.0 V to 30 V - Supports wide industrial and telecom input rails; absolute max 33 V. |
| Output Current Limit | 1.25 A valley current - Limits peak inductor current to prevent saturation and thermal overload. |
| Internal Reference | 2.500 V ±1.2% - Sets output voltage via R1/R2 divider; enables precise adjustable regulation. |
| VCC Startup Regulator | 7.0 V ±0.4 V at 0 mA - Powers internal circuitry; dropout ≈1.3 V; UVLO threshold = 5.7 V. |
| Minimum Off-Time | 250 ns ±15% - Guarantees bootstrap capacitor recharge; constrains max duty cycle at low VIN. |
| Softstart Current Source | 12.3 µA - Charges external SS capacitor linearly to 2.5 V for controlled output ramp-up. |
| Thermal Shutdown | 175°C activation, 155°C recovery - Protects die during sustained overload or poor heatsinking. |
Pinout & Package
LM2695SDX/NOPB is housed in a thermally enhanced 10-pin WSON package (4 mm × 4 mm) with exposed thermal pad (EP) connected to SGND. The EP must be soldered to PCB ground plane using multiple vias for optimal thermal performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching Node | Drain of internal N-MOSFET; connects to inductor, freewheeling diode, and BST capacitor. |
| 2 BST | Bootstrap Supply | Charged from VCC via internal diode during off-time; powers high-side gate driver. |
| 3 ISEN | Current Sense Output | Sinks recirculating current; 130 mΩ internal sense resistor sets 1.25 A valley limit. |
| 4 SGND | Sense Ground Return | Return path for current-sense resistor; separate from power ground (RTN) to avoid noise coupling. |
| 5 RTN | Circuit Ground | Reference for all internal bias and logic circuits except current-sense path. |
| 6 FB | Feedback Input | Compares output voltage (via R1/R2) to 2.5 V reference; ripple ≥25 mV required for stability. |
| 7 SS | Softstart Control | Internal 12.3 µA current source ramps voltage to 2.5 V; grounded during UVLO or shutdown. |
| 8 RON/SD | On-Time Set / Shutdown | Resistor from VIN sets tON; <0.8 V forces shutdown and disables softstart. |
| 9 VCC | Startup Regulator Output | 7.0 V regulated supply; can accept external 8–14 V bias to reduce dissipation. |
| 10 VIN | Main Input Supply | 8–30 V input; internal 33 V rating allows transient tolerance up to 33 V. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic control eliminates external compensation components, reducing BOM count and layout sensitivity. |
| Ultra-fast transient response | On-demand switching with 250 ns minimum off-time enables immediate reaction to load steps without phase-margin tuning. |
| Integrated 33 V N-channel buck switch | Eliminates external high-voltage MOSFET; RDS(on) = 0.33 Ω typical reduces conduction loss at 1.25 A. |
| Adjustable output voltage | 2.5 V internal reference + external resistor divider supports outputs from ~2.5 V to near VIN, enabling flexible POL design. |
| Valley current limit at 1.25 A | Prevents inductor saturation and thermal runaway under overload while maintaining continuous conduction mode at rated loads. |
| Exposed thermal pad (EP) | θJA = 37°C/W (0 LFPM); pad tied to PCB ground plane improves heat dissipation in compact high-power layouts. |
Applications
| Telecom Secondary Post-Regulator | Industrial High-Voltage POL |
|---|---|
|
Use Scenario: Regulating 48 V telecom bus down to 3.3 V or 5 V for DSP/FPGA core supplies in base station equipment. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering 1.25 A with fast transient response to handle burst-mode processing loads. Use Value: Eliminates need for external high-voltage MOSFET and compensation network, reducing board area and design cycle time. |
Use Scenario: Powering PLC I/O modules or motor drivers from 24 V or 30 V industrial rails requiring stable 5 V or 12 V bias. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating continuously across wide temperature range (−40°C to +125°C). Use Value: Integrated VCC startup regulator enables direct connection to unregulated industrial input without auxiliary bias supply. |
| Automotive Infotainment DC-DC | LED Driver Bias Supply |
|
Use Scenario: Generating 5 V supply for infotainment head unit microcontrollers from 12 V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Buck regulator with 8 V minimum input and 33 V absolute max withstands automotive load-dump transients. Use Value: Valley current limit and thermal shutdown protect against short-circuit faults common in vehicle harness environments. |
Use Scenario: Providing constant-current bias for high-brightness LED strings in signage or backlighting systems. IC Role / Device Role / Timing Role: Adjustable-output buck stage setting reference voltage for external LED current controller ICs. Use Value: Precision 2.5 V reference and low FB bias current (<1 nA) ensure accurate current-setting resistor ratio over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | Wettable flank 10-pin SO PowerPAD; 3–65 V input; 0.6 A; current-mode control with external compensation. | Higher input range but lower current rating; requires loop compensation; AEC-Q100 qualified. | Preferred for automotive applications requiring qualification and wider VIN, but not drop-in for 1.25 A loads. |
| TPS54202DDCR | 6-pin SOT-23; 4.5–28 V input; 2 A; integrated FETs; current-mode control; 1.5 MHz fixed frequency. | Smaller package and higher current, but lacks 30 V input capability and valley current limiting. | Best for space-constrained 24 V systems needing higher current and fixed-frequency EMI control, not high-VIN robustness. |
Compared with LM2695SDX/NOPB, LM5164QDDARQ1 offers automotive qualification and extended input range but trades off output current and adds compensation complexity; TPS54202DDCR delivers higher current in a smaller footprint but cannot support 30 V inputs or provide the same transient-hardened valley-limiting behavior.
Availability
LM2695SDX/NOPB is available at Aetrix Electronics and suitable for telecom secondary regulators, industrial high-voltage POL supplies, and automotive infotainment bias applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2695SDX/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 LM2695SDX/NOPB belongs to TI's high-voltage buck regulator product line, engineered for efficient, compact, and robust DC-DC conversion in industrial, telecom, and automotive systems where input transients and thermal constraints demand integrated protection and simplified design.
FAQ
What is the maximum input voltage rating for the LM2695SDX/NOPB?
The LM2695SDX/NOPB has an absolute maximum VIN-to-RTN rating of 33 V, with recommended operating range of 8.0 V to 30.0 V. Exceeding 33 V risks permanent damage. The device tolerates brief transients within this limit, but sustained operation above 30 V is not specified or guaranteed per the SNVS413A datasheet.
Does the LM2695SDX/NOPB require external compensation components?
No, the LM2695SDX/NOPB uses a hysteretic on-time control architecture that eliminates the need for external compensation networks. This simplifies design, reduces component count, and ensures inherent stability across line and load variations without loop-tuning effort.
How is the output voltage set on the LM2695SDX/NOPB?
The LM2695SDX/NOPB output voltage is set using two external resistors (R1 and R2) forming a feedback divider to the FB pin. With a precise 2.500 V internal reference, VOUT = 2.5 × (R1 + R2)/R2. Standard 1% resistors between 1 kΩ and 10 kΩ are recommended for optimal accuracy and noise immunity.
What is the function of the RON/SD pin on the LM2695SDX/NOPB?
The RON/SD pin on the LM2695SDX/NOPB serves dual functions: connecting an external resistor from VIN sets the on-time (and thus switching frequency), while pulling the pin below 0.8 V places the LM2695SDX/NOPB into shutdown mode-disabling the switch, grounding SS, and reducing quiescent current to ≤200 µA.
Can the LM2695SDX/NOPB operate without an external bootstrap capacitor?
No-the LM2695SDX/NOPB requires a 0.022 µF ceramic capacitor between BST and SW pins. This capacitor supplies gate-drive energy during the on-time and recharges via the internal VCC-to-BST diode during each 250 ns minimum off-time. Omitting it causes gate drive failure and immediate malfunction.
LM2695SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WDFN 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):
- 30V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 1.25A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (4x4)
LM2695SDX/NOPB FAQ
1.How can I place an order for LM2695SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2695SDX/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 LM2695SDX/NOPB reliable?
The price and inventory of LM2695SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2695SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2695SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2695SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2695SDX/NOPB?
LM2695SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2695SDX/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 LM2695SDX/NOPB?
For technical support, including LM2695SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2695SDX/NOPB requirements.
6.How does Aetrix verify that LM2695SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2695SDX/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 LM2695SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2695SDX/NOPB?
All LM2695SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2695SDX/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 LM2695SDX/NOPB part is unused and in its original packaging.
Return procedure for LM2695SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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