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Texas Instruments LM2695SD/NOPB
- Part No.:
- LM2695SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM2695SD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,815
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Product details
Overview
LM2695SD/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 and industrial power supplies.
For engineers reviewing the LM2695SD/NOPB datasheet, LM2695SD/NOPB pinout, LM2695SD/NOPB application, or LM2695SD/NOPB equivalent, key selection criteria include its hysteretic control architecture (no loop compensation required), fixed-frequency behavior across line/load, 1.25A valley current limit, 7V VCC startup regulator, and WSON-10 thermal pad package for high-power-density designs.
Technical Context
The LM2695SD/NOPB implements a hysteretic on-time control scheme where switching frequency remains stable across input voltage (8V–30V) and load variations due to inverse VIN–tON relationship. Its regulation relies on FB pin 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 | 8V to 30V - supports wide-range industrial and telecom inputs; absolute max 33V transient tolerance |
| Output Current Limit | 1.25A valley current - sets hard current ceiling during overload; enables robust short-circuit protection |
| Internal Reference | 2.5V ±1.2% - defines regulated output via R1/R2 feedback divider; <100 nA bias current minimizes error |
| VCC Startup Regulator | 7.0V ±0.4V @ 0 mA - powers internal circuitry; 9.7 mA current limit prevents thermal overload |
| Switch RDS(on) | 0.33 Ω typical - reduces conduction loss at full load; rated for 2A peak, 1.5A average switch current |
| Softstart Current Source | 12.3 µA - charges external SS capacitor linearly to 2.5V, enabling controlled output ramp-up |
| Minimum Off-Time | 250 ns - guarantees bootstrap capacitor recharge time; limits maximum duty cycle at low VIN |
Pinout & Package
LM2695SD/NOPB is housed in a thermally enhanced 10-pin WSON package (4 mm × 4 mm) with exposed thermal pad (EP) connected to SGND for PCB heat dissipation. Pin 1 is SW; pin 10 is VIN; EP must be soldered to ground plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Connects to inductor, freewheeling diode cathode, and BST capacitor; carries high di/dt ripple current |
| BST | Bootstrap supply | Accepts 0.022 µF capacitor between BST and SW; powers high-side gate driver during on-time |
| ISEN | Current sense output | Sinks recirculating current from SGND; threshold set at 1.25A; external resistor can raise limit |
| SGND | Sense ground return | Provides Kelvin return path for current-sense resistor; separate from RTN to avoid noise coupling |
| RTN | Circuit ground reference | Reference for VCC, FB, SS, RON/SD; connects to system ground but isolated from high-current paths |
| FB | Feedback input | Compares output voltage (via R1/R2) to 2.5V reference; requires ≥25 mV ripple for stable hysteretic operation |
| SS | Softstart control | Charged by 12.3 µA current source; clamped low during UVLO, thermal shutdown, or shutdown mode |
| RON/SD | On-time programming & shutdown | Resistor from VIN sets tON; grounding disables regulator and resets softstart |
| VCC | Startup regulator output | 7.0V supply for internal logic/gate drive; can be externally biased (8V–14V) to reduce dissipation |
| VIN | Main input supply | Accepts 8V–30V; internally diode-connected to VCC; 33V absolute max rating |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for external compensation network; enables ultra-fast load transient response without stability tuning |
| Integrated 33V N-channel buck switch | Reduces BOM count and layout complexity; RDS(on) = 0.33 Ω typical enables >90% efficiency at 12V→5V/1A |
| Self-biasing VCC startup regulator | Enables direct connection to 8V–30V rail; eliminates need for auxiliary bias supply in most applications |
| Valley current limit at 1.25A | Provides accurate, temperature-stable overcurrent protection independent of inductor DCR or ESR |
| Thermally enhanced WSON-10 package | θJA = 37°C/W (0 LFPM); exposed pad improves thermal performance for continuous 1.25A operation |
Applications
| Telecom Point-of-Load Regulation | Industrial High-Voltage Post-Regulation |
|---|---|
|
Use Scenario: Converting 24V or 48V intermediate bus to 3.3V/5V for FPGA, DSP, or ASIC core logic in telecom equipment. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering up to 1.25A with fast transient response to handle burst-mode processor loads. Use Value: Hysteretic control maintains regulation during rapid load steps (e.g., 0→1A in <1 µs); no compensation saves board space and design time. |
Use Scenario: Stepping down 28V aircraft or 30V industrial supply to 12V for motor drivers, sensors, or PLC I/O modules. IC Role / Device Role / Timing Role: High-input-voltage buck converter operating reliably across wide temperature range (−40°C to +125°C junction). Use Value: 30V max input and 33V switch rating tolerate transients common in avionics/industrial environments; thermal shutdown protects under overload. |
| Secondary Buck for LED Drivers | Non-Isolated Telecom DC/DC Module |
|
Use Scenario: Providing stable 5V bias supply for constant-current LED driver ICs in outdoor signage or street lighting systems. IC Role / Device Role / Timing Role: Efficient, compact secondary regulator powered from 12V–24V intermediate rail; adjustable output supports varied driver requirements. Use Value: Adjustable output (via R1/R2) allows precise 5.0V or 3.3V generation; low quiescent current extends standby battery life. |
Use Scenario: Embedded buck stage inside modular telecom power supply delivering 3.3V/5V/12V outputs from 48V backplane. IC Role / Device Role / Timing Role: High-efficiency, low-noise POL regulator with minimal external components-ideal for dense multi-rail modules. Use Value: WSON-10 footprint (4 mm × 4 mm) and integrated switch reduce solution size vs. controller+MOSFET alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5165QPWPRQ1 | Wider 3V–65V input; 150 mA output; integrated FET; requires external compensation | Designed for automotive AEC-Q100; lower current rating unsuitable for 1.25A loads | Select when input exceeds 30V or automotive qualification is mandatory; not a drop-in replacement |
| TPS54202HDDCR | 18V max input; 2A output; current-mode control; requires compensation; smaller 8-pin SOIC | Optimized for low-input-voltage, high-current apps (e.g., 12V→3.3V); lacks 30V capability | Choose for cost-sensitive 12V systems needing higher current; incompatible with 24V+ inputs |
Compared with LM2695SD/NOPB, LM5165QPWPRQ1 supports higher input voltage but cannot deliver 1.25A continuously, while TPS54202HDDCR offers higher output current but fails at 24V+ inputs-making LM2695SD/NOPB uniquely suited for 8V–30V, 1.25A industrial POL use cases.
Availability
LM2695SD/NOPB is available at Aetrix Electronics and suitable for telecom power supplies, industrial motor controls, and LED driver bias circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2695SD/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 LM2695SD/NOPB belongs to TI's high-voltage buck regulator product line, engineered specifically for efficient, compact, and robust DC/DC conversion in 8V–30V industrial and telecom infrastructure applications.
FAQ
What is the maximum input voltage rating for LM2695SD/NOPB?
The LM2695SD/NOPB has an absolute maximum input voltage (VIN to RTN) of 33V, with recommended operating range of 8V to 30V. Exceeding 33V risks permanent damage. The integrated 33V N-channel buck switch and internal protection circuits are designed to sustain this rating under transient conditions, making LM2695SD/NOPB suitable for 24V and 48V intermediate bus applications with margin.
How does the LM2695SD/NOPB achieve stable output without external compensation?
The LM2695SD/NOPB uses a hysteretic on-time control architecture that compares FB voltage directly to a 2.5V internal reference. When FB drops below 2.5V, the switch turns on for a VIN- and RON-dependent duration, then stays off until FB falls again. This self-clocking method eliminates loop stability concerns, removes the need for external compensation components, and delivers ultra-fast transient response-key features of the LM2695SD/NOPB design.
Can the LM2695SD/NOPB be used with an external bias supply on the VCC pin?
Yes, the LM2695SD/NOPB supports external biasing of the VCC pin with 8V–14V to disable the internal startup regulator and reduce power dissipation. An external supply must be diode-connected to prevent backfeed, and the sum of external VCC and VIN must not exceed 47V. This feature is commonly used in high-efficiency designs where LM2695SD/NOPB operates from a pre-regulated rail.
What is the purpose of the ISEN and SGND pins on the LM2695SD/NOPB?
The ISEN pin sinks recirculating current from the SGND pin during the off-time, enabling valley current limiting at 1.25A. SGND provides a dedicated Kelvin return path for the internal 130 mΩ current-sense resistor, isolating high-current switching noise from the precision FB and regulation circuitry. This separation ensures accurate current limiting and stable regulation in the LM2695SD/NOPB, especially under dynamic load conditions.
Does the LM2695SD/NOPB require minimum output capacitor ESR for stable operation?
Yes, the LM2695SD/NOPB requires ≥25 mVp-p ripple voltage at the FB pin for proper hysteretic regulation. This is typically achieved using the ESR of the output capacitor (C2) in series with the feedback divider. If C2's ESR is insufficient, a small external resistor (R3, usually <1 Ω) must be added in series with C2 to generate the required ripple-failure to meet this condition causes regulation instability or oscillation in the LM2695SD/NOPB.
LM2695SD/NOPB 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/NOPB FAQ
1.How can I place an order for LM2695SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2695SD/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 LM2695SD/NOPB reliable?
The price and inventory of LM2695SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2695SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2695SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2695SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2695SD/NOPB?
LM2695SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2695SD/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 LM2695SD/NOPB?
For technical support, including LM2695SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2695SD/NOPB requirements.
6.How does Aetrix verify that LM2695SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2695SD/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 LM2695SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2695SD/NOPB?
All LM2695SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2695SD/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 LM2695SD/NOPB part is unused and in its original packaging.
Return procedure for LM2695SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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