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Texas Instruments LM2695SD
- Part No.:
- LM2695SD
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM2695SD.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,333
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Product details
Overview
LM2695SD 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, hysteretic control architecture requiring no loop compensation, and adjustable output voltage via external resistor divider. It operates across 8V–30V input range and delivers stable POL regulation in telecom secondary post-regulation and industrial high-voltage DC-DC conversion.
For engineers reviewing the LM2695SD datasheet, LM2695SD pinout, LM2695SD application, or LM2695SD equivalent, this page provides verified technical context, validated pin functions, confirmed thermal shutdown behavior at 175°C, exact on-time calculation using RON resistor, and real-world softstart timing based on 12.3 µA internal current source and external C6 capacitor.
Technical Context
The LM2695SD implements a fixed-frequency hysteretic control scheme where on-time (tON) varies inversely with VIN and is set by an external RON resistor - enabling stable operation across 8V–30V input without compensation components. Its valley current limit is fixed at 1.25A with 130 mΩ internal sense resistance between ISEN and SGND.
Regulation relies on a 2.5V precision internal reference compared against FB pin voltage; overvoltage protection triggers at 2.9V. The start-up regulator delivers 7.0V ±0.4V at VCC with 9.7 mA current limit and 5.7V UVLO threshold, while thermal shutdown activates at 175°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.0V to 30V - supports wide-range industrial and telecom inputs; absolute max VIN = 33V |
| Output Current Limit | 1.25A valley current limit - sets hard current ceiling during overload; enables robust short-circuit protection |
| Switch RDS(on) | 0.33Ω typical - determines conduction loss at full load; impacts thermal design and efficiency above 1A |
| Feedback Reference | 2.5V ±1.2% - defines regulated output as VOUT = 2.5 × (R1 + R2)/R2; enables precise programmable outputs |
| Softstart Current Source | 12.3 µA - charges external SS capacitor linearly; sets controlled ramp rate for output voltage startup |
| VCC Regulator Output | 7.0V ±0.4V - powers internal gate driver and logic; allows auxiliary biasing (8V–14V) to reduce dissipation |
| Thermal Shutdown | 175°C activation / 155°C recovery - protects die under sustained overload; requires PCB thermal pad connection for full rating |
Pinout & Package
LM2695SD is packaged in thermally enhanced WSON-10 (4 mm × 4 mm) with exposed thermal pad. Pin mapping is validated per TI SNVS413A datasheet Figure 2 and Pin Descriptions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching Node | Connects to inductor, freewheeling diode cathode, and bootstrap capacitor - carries high di/dt switching current |
| 2 BST | Bootstrap Supply | Accepts 0.022 µF capacitor from SW - supplies floating gate drive voltage for N-channel high-side switch |
| 3 ISEN | Current Sense Output | Sinks recirculating current during off-time - used for valley current limit detection at 1.25A |
| 4 SGND | Sense Ground Return | Provides dedicated return path for current-sense resistor - separates high-noise sense path from main ground |
| 5 RTN | Main Circuit Ground | Reference for all internal circuitry except current sensing - connects to system ground plane |
| 6 FB | Feedback Input | Compares output voltage (via R1/R2 divider) to 2.5V reference - controls on-time initiation |
| 7 SS | Softstart Control | Charged by 12.3 µA current source - ramps regulation reference to prevent inrush and overshoot |
| 8 RON/SD | On-Time Set & Shutdown | Resistor to VIN sets tON; grounding disables regulator and resets softstart |
| 9 VCC | Startup Regulator Output | 7.0V supply for internal logic/gate drive - can be externally biased to reduce power loss |
| 10 VIN | Main Input Supply | Accepts 8V–30V input - feeds both buck switch and internal start-up regulator |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic control eliminates external compensation network - reduces BOM count and layout sensitivity |
| Ultra-fast transient response | On-time control + no compensation yields sub-microsecond load step recovery - critical for POL applications |
| Adjustable output voltage | Set via R1/R2 divider referenced to 2.5V - supports 3.3V, 5V, 12V, or custom outputs with <±1.2% accuracy |
| Exposed thermal pad | Internally connected to substrate - must be soldered to PCB ground plane with multiple vias for θJA = 37°C/W |
| Maximum duty cycle limiter | Prevents runaway during startup or low-VIN conditions - ensures safe initial regulation and fault recovery |
Applications
| Telecom Secondary Post-Regulator | Industrial High-Voltage POL |
|---|---|
Use Scenario: Converts 24V or 48V intermediate bus to 3.3V/5V for FPGA, DSP, or ASIC core logic in base station equipment. IC Role / Device Role / Timing Role: Primary buck regulator delivering up to 1.25A with fixed-frequency hysteretic control and no external compensation. Use Value: Eliminates need for error amplifier and compensation components - simplifies layout and improves transient immunity in noisy RF environments. | Use Scenario: Powers microcontrollers and sensors in factory automation systems operating from 24V industrial rails. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with thermal shutdown and input UVLO for robust operation in unregulated environments. Use Value: 175°C thermal shutdown and 30V input rating enable reliable operation in hot, high-voltage industrial enclosures without derating. |
| Non-Isolated DC-DC Converter | High-Efficiency Bias Supply |
Use Scenario: Generates isolated auxiliary rail (e.g., ±12V) in conjunction with transformer-based topologies where primary-side regulation is handled externally. IC Role / Device Role / Timing Role: Non-isolated buck stage providing stable, low-noise bias voltage for gate drivers or op-amps. Use Value: Valley current limiting and fast transient response maintain tight regulation even under dynamic load steps from digital ICs. | Use Scenario: Supplies clean 5V/7V bias to analog front-ends or communication interfaces in instrumentation systems. IC Role / Device Role / Timing Role: Self-biased buck regulator using VCC pin for internal gate drive - supports auxiliary 8V–14V bias to minimize thermal stress. Use Value: External VCC biasing reduces internal dissipation by >40% at high VIN, extending lifetime in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2695MH/NOPB | HTSSOP-14 package with same electrical specs; includes NC pins and larger thermal pad area | Better thermal performance in high-power continuous operation; requires different PCB footprint | Select when board space allows larger package and junction temperature margin is critical |
| TPS54202D | 4.5V–28V input, 2A current limit, current-mode control with external compensation; 2.5V ref | Requires compensation network but offers tighter line/load regulation and higher current capability | Choose when precise regulation (<±1%) and >1.25A output are required despite added complexity |
Compared with LM2695SD, LM2695MH/NOPB offers identical functionality in a thermally superior HTSSOP-14 package, while TPS54202D trades simplicity for higher current and tighter regulation - making LM2695SD optimal for cost-sensitive, compact 1.25A POL designs where ultrafast transients matter more than millivolt-level accuracy.
Availability
LM2695SD is available at Aetrix Electronics and suitable for telecom secondary post-regulation, industrial high-voltage POL, non-isolated DC-DC conversion, and high-efficiency bias supply applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2695SD 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 over 50 years of innovation in high-reliability power conversion solutions.
The LM2695 product line delivers high-voltage, high-current buck regulators optimized for telecom infrastructure, industrial automation, and automotive subsystems where input ranges exceed 24V and thermal resilience is essential.
FAQ
What is the maximum input voltage rating for LM2695SD?
The LM2695SD has an absolute maximum input voltage (VIN to RTN) rating of 33V, with recommended operating range of 8.0V to 30V. Exceeding 33V risks permanent damage. Transient spikes beyond 30V must be clamped externally, as the device lacks integrated overvoltage protection on VIN. Always verify input rail stability and surge margins before finalizing the LM2695SD design.
How does the LM2695SD achieve no-loop-compensation operation?
The LM2695SD uses a hysteretic control architecture where the FB pin voltage is compared directly to a 2.5V internal reference. When FB falls below 2.5V, the buck switch turns on for a precisely timed on-period determined by VIN and RON; it then remains off until FB drops again. This eliminates the need for external compensation components like type-II or type-III networks, reducing design complexity and improving transient response. The LM2695SD's inherent stability comes from its fixed on-time + variable off-time structure.
Can LM2695SD be used with ceramic output capacitors only?
Yes, LM2695SD can operate with ceramic output capacitors, but requires ≥25 mVp-p ripple at the FB pin for proper hysteretic regulation. Standard low-ESR ceramics often fall below this threshold, so either a small series resistor (R3) must be added to C2, or a hybrid capacitor with sufficient ESR selected. TI recommends verifying ripple amplitude at FB with oscilloscope measurement during validation - insufficient ripple causes regulation instability or oscillation in the LM2695SD.
What is the purpose of the ISEN and SGND pins on LM2695SD?
The ISEN pin sinks the recirculating inductor current during the off-time, enabling valley current limit detection at 1.25A. SGND provides the dedicated return path for the internal 130 mΩ current-sense resistor, isolating high-di/dt sense current from the main RTN ground. This separation prevents noise coupling into regulation feedback and ensures accurate current limiting. Both pins must be routed with short, low-inductance traces directly to the freewheeling diode cathode and sense resistor - improper layout degrades LM2695SD current-limit accuracy and stability.
Does LM2695SD support remote shutdown, and how is it implemented?
Yes, LM2695SD supports remote shutdown via the RON/SD pin. Driving this pin below 0.8V (typical) disables the buck switch, grounds the SS pin internally, and reduces quiescent current to ≤200 µA. Releasing the pin allows normal operation to resume after softstart reinitialization. The shutdown threshold has 37 mV hysteresis to prevent chatter. This function is fully compatible with microcontroller GPIOs or system-level enable signals - no external pull-up is needed since LM2695SD includes internal biasing for RON/SD.
LM2695SD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WDFN 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:
- 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)
LM2695SD FAQ
1.How can I place an order for LM2695SD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2695SD 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 LM2695SD reliable?
The price and inventory of LM2695SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2695SD is usually 5 days.
3.What payment methods are accepted for LM2695SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2695SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2695SD?
LM2695SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2695SD 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 LM2695SD?
For technical support, including LM2695SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2695SD requirements.
6.How does Aetrix verify that LM2695SD is sourced from the original manufacturer or authorized distributors?
All LM2695SD 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 LM2695SD meets industry standards.
7.What is the process for return or replacement of LM2695SD?
All LM2695SD units undergo pre-shipment inspection (PSI). If there is an issue with LM2695SD, 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 LM2695SD part is unused and in its original packaging.
Return procedure for LM2695SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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