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Texas Instruments LM2695SDX
- Part No.:
- LM2695SDX
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM2695SDX.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,125
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Product details
Overview
LM2695SDX from Texas Instruments is a high-voltage, 1.25A step-down switching regulator IC featuring an integrated 33V N-channel buck switch, hysteretic control architecture, and operation across 8V–30V input range. It delivers regulated DC output with no loop compensation required, supports adjustable output voltage via external resistor divider, and targets point-of-load and telecom post-regulation applications.
For engineers reviewing the LM2695SDX datasheet, LM2695SDX pinout, LM2695SDX application, or LM2695SDX equivalent, key selection considerations include its valley current limit (1.25A), fixed 2.5V feedback reference, softstart timing via external capacitor, BST bootstrap capacitor requirement (0.022 µF), and thermal shutdown activation at 175°C.
Technical Context
The LM2695SDX employs 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 comparing FB voltage to a precision 2.5V internal reference, with overvoltage protection triggered at 2.9V.
Current limiting operates during off-time via valley detection at ISEN/SGND, with nominal threshold of 1.25A and 130 mΩ internal sense resistance. Startup uses an integrated 7.0V series regulator (VCC) with UVLO at 5.7V, and gate drive utilizes a bootstrap circuit requiring SW–BST capacitance for high-side N-FET operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 30V - supports wide industrial and telecom input rails without external pre-regulation |
| Output Current Limit | 1.25A valley current limit - sets maximum sustainable load before foldback, with internal 130 mΩ sense resistor |
| Feedback Reference | 2.5V ±1.2% - enables precise output voltage setting using R1/R2 divider per VOUT = 2.5 × (R1 + R2)/R2 |
| Switch RDS(on) | 0.33 Ω (typ) - determines conduction loss and thermal rise under full load |
| Softstart Current Source | 12.3 µA - charges external SS capacitor to control ramp rate of output voltage at startup |
| Thermal Shutdown | 175°C activation with 20°C hysteresis - protects die during overload or poor heatsinking; resumes at ≈155°C |
| VCC Regulator Output | 7.0V ±0.4V - powers internal logic and gate driver; can be bypassed with external 8V–14V supply to reduce dissipation |
Pinout & Package
LM2695SDX is packaged in a thermally enhanced 10-pin WSON (4 mm × 4 mm) with exposed thermal pad. Pin assignments are validated per TI SNVS413A datasheet Figure 2 and Pin Descriptions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching Node | Connection to inductor, freewheeling diode cathode, and BST capacitor - carries high di/dt pulsed current |
| BST | Bootstrap Supply | Connects to SW via 0.022 µF ceramic capacitor - provides floating gate drive voltage for N-channel high-side switch |
| ISEN | Current Sense Output | Sinks recirculating inductor current during off-time - used for valley current limit detection at 1.25A |
| SGND | Sense Ground Return | Return path for ISEN current through internal 130 mΩ resistor - must be routed separately from power ground to avoid noise coupling |
| RTN | Circuit Ground | Reference for all internal bias and regulation circuits except current sense - connects to system ground plane |
| FB | Feedback Input | Compares output voltage (via R1/R2 divider) to 2.5V reference - ripple ≥25 mV required for stable hysteretic operation |
| SS | Softstart Control | Internal 12.3 µA current source charges external capacitor - controls output voltage ramp time and reduces inrush stress |
| RON/SD | On-Time Set / Shutdown | Resistor from VIN sets tON; grounding disables regulator and resets softstart - dual-function pin with hysteresis (0.45V–1.2V) |
| VCC | Startup Regulator Output | 7.0V regulated supply for internal circuitry - can accept external 8V–14V to disable internal regulator and lower power loss |
| VIN | Main Input Supply | Accepts 8V–30V DC input - withstands transient up to 33V; internally diode-connected to VCC |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic control eliminates external compensation network - simplifies layout and improves transient response |
| Ultra-fast transient response | On-time control and comparator-based regulation enable sub-microsecond recovery from load steps |
| Adjustable output voltage | Set via external R1/R2 divider referenced to 2.5V - supports outputs from ~2.5V to >20V depending on resistor ratio |
| Thermally enhanced WSON-10 | 4 mm × 4 mm package with exposed pad - achieves θJA = 37°C/W (0 LFPM) and θJC = 6.6°C/W for efficient heat transfer |
| Integrated start-up regulator | Self-biased 7.0V VCC output - eliminates need for external bias supply while supporting direct 8V–30V input connection |
Applications
| Telecom Secondary Post-Regulator | Industrial Point-of-Load Converter |
|---|---|
Use Scenario: Regulating 48V telecom bus down to 3.3V/5V for line card ASICs and FPGAs. IC Role / Device Role / Timing Role: Primary non-isolated buck converter providing stable, high-efficiency local power with fast transient handling. Use Value: Delivers 1.25A continuous output with <1% load regulation and <500 ns recovery from 50% load step - critical for digital logic stability. | Use Scenario: Powering microcontrollers and sensors in factory automation equipment operating from 24V DC rails. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator enabling single-rail power architecture without intermediate converters. Use Value: Operates reliably across 8V–30V input range with built-in thermal shutdown and UVLO - ensures robustness in variable industrial environments. |
| High-Voltage LED Driver Bias Supply | Automotive Aftermarket Camera Module Power |
Use Scenario: Generating constant-current LED bias from 12V–24V vehicle battery or 24V industrial supply. IC Role / Device Role / Timing Role: Fixed-frequency buck controller supplying stable voltage to external LED driver ICs or analog bias networks. Use Value: Maintains constant switching frequency across input and load changes - simplifies EMI filtering design for lighting systems. | Use Scenario: Powering CMOS image sensors and video processors in automotive rear-view cameras exposed to 12V battery transients. IC Role / Device Role / Timing Role: Input-tolerant DC-DC regulator with 33V absolute max rating and fast overvoltage shutdown (2.9V FB clamp). Use Value: Survives load-dump events up to 33V and shuts down within nanoseconds if output spikes - protects downstream imaging circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5165QPWPRQ1 | Wider input range (3V–65V), lower IQ (15 µA), requires external compensation - not hysteretic | Supports ultra-low input voltages and automotive cold-crank; less suitable for cost-sensitive non-automotive designs | Choose when input may dip below 8V or AEC-Q100 qualification is mandatory |
| TPS54202DDCR | Lower input range (4.5V–28V), 2A current limit, current-mode control with compensation - higher efficiency at light loads | Better suited for 5V/12V input systems; lacks 30V+ input capability and integrated start-up regulator | Prefer when VIN stays ≤28V and higher light-load efficiency outweighs simplicity of LM2695SDX's hysteretic architecture |
Compared with LM5165QPWPRQ1 and TPS54202DDCR, the LM2695SDX offers unique value in high-input-voltage (>24V), cost-sensitive, and layout-constrained applications where no-compensation hysteretic control, integrated VCC startup, and 30V operation are decisive advantages - without requiring automotive qualification or ultra-low quiescent current.
Availability
LM2695SDX is available at Aetrix Electronics and suitable for telecom secondary regulation, industrial point-of-load conversion, and high-voltage LED bias supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2695SDX 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, performance, and broad application support.
The LM2695SDX belongs to TI's high-voltage DC-DC regulator product line, designed specifically for efficient, compact, and low-BOM-count buck conversion in 8V–30V industrial and telecom power systems.
FAQ
What is the maximum input voltage rating for the LM2695SDX?
The LM2695SDX 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. The device is rated for transient tolerance up to 33V, making it suitable for 24V industrial and 48V telecom systems with appropriate input filtering.
Does the LM2695SDX require external compensation components?
No, the LM2695SDX does not require external compensation components. Its hysteretic control architecture eliminates the need for loop compensation networks, reducing component count and simplifying PCB layout. Stability is inherent to the on-time control scheme and feedback comparator design.
How is the output voltage set on the LM2695SDX?
The output voltage of the LM2695SDX is set using two external resistors (R1 and R2) forming a voltage divider from VOUT to FB to RTN. The formula is VOUT = 2.5 V × (R1 + R2) / R2. The internal 2.5V reference is trimmed to ±1.2% over temperature, ensuring accurate regulation across the operating range.
What is the purpose of the BST pin on the LM2695SDX?
The BST pin on the LM2695SDX supplies gate drive voltage to the integrated N-channel high-side buck switch. A 0.022 µF ceramic capacitor must be placed between BST and SW to form a bootstrap circuit. During each off-time, this capacitor recharges from VCC via an internal diode, enabling full enhancement of the high-side FET during on-time.
Can the LM2695SDX be shut down remotely, and how?
Yes, the LM2695SDX supports remote shutdown via the RON/SD pin. Driving this pin below 0.8V (with hysteresis) disables the on-timer, grounds the SS pin, and reduces bias current to ≤200 µA. Releasing the pin above 1.2V restores normal operation. This function allows precise system-level power sequencing and standby control.
LM2695SDX 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)
LM2695SDX FAQ
1.How can I place an order for LM2695SDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2695SDX 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 reliable?
The price and inventory of LM2695SDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2695SDX is usually 5 days.
3.What payment methods are accepted for LM2695SDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2695SDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2695SDX?
LM2695SDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2695SDX 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?
For technical support, including LM2695SDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2695SDX requirements.
6.How does Aetrix verify that LM2695SDX is sourced from the original manufacturer or authorized distributors?
All LM2695SDX 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 meets industry standards.
7.What is the process for return or replacement of LM2695SDX?
All LM2695SDX units undergo pre-shipment inspection (PSI). If there is an issue with LM2695SDX, 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 part is unused and in its original packaging.
Return procedure for LM2695SDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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