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Texas Instruments LM2695MHX/NOPB
- Part No.:
- LM2695MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2695MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.25A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,184
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Product details
Overview
LM2695MHX/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, hysteretic control architecture, and no loop compensation required. It delivers stable DC/DC conversion for industrial power rails, telecom secondary regulation, and point-of-load applications where input voltage ranges from 8V to 30V.
For engineers reviewing the LM2695MHX/NOPB datasheet, LM2695MHX/NOPB pinout, LM2695MHX/NOPB application, or LM2695MHX/NOPB equivalent, key selection criteria include its fixed 2.5V feedback reference, programmable on-time via RON resistor, 12.3 µA softstart current source, and thermal shutdown at 175°C - all critical for robust high-voltage POL design.
Technical Context
The LM2695MHX/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 comparing FB voltage to a precision 2.5V internal reference, while overvoltage protection triggers at 2.9V.
Current limiting operates in valley mode with 1.25A threshold sensed at ISEN/SGND, and startup is managed by an integrated 7.0V VCC regulator with 5.7V UVLO. The device uses bootstrap gate drive (BST–SW capacitor = 0.022 µF) and supports remote shutdown via RON/SD pin below 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 30V - supports wide-range industrial and telecom inputs without external pre-regulation |
| Output Current Limit | 1.25A valley current limit - sets maximum sustainable load current and enables overload foldback |
| Feedback Reference | 2.5V ±1% - defines regulated output via external R1/R2 divider; enables precise adjustable VOUT |
| Softstart Current | 12.3 µA - charges external SS capacitor linearly to control ramp rate of output voltage |
| Switch RDS(on) | 0.33 Ω (typ) - determines conduction loss and thermal rise under full load |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects die during sustained overload or poor PCB heat sinking |
| VCC Regulator Output | 7.0V ±0.4V - powers internal logic and gate driver; can be bypassed with 8–14V auxiliary supply |
Pinout & Package
LM2695MHX/NOPB is packaged in thermally enhanced HTSSOP-14 (PWP) with exposed thermal pad. Pin mapping is validated per TI SNVS413A datasheet Figure 1 and Pin Descriptions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 8–30V; connects to input capacitor C1 and RON/SD resistor network |
| SW | Switching node | Drives inductor L1 and bootstrap capacitor C4; high di/dt path requiring tight layout |
| BST | Bootstrap supply | Connects to SW via 0.022 µF ceramic capacitor to enable high-side N-FET gate drive |
| ISEN | Current sense output | Sinks recirculating inductor current; used with SGND to set 1.25A valley current limit |
| SGND | Sense ground return | Provides Kelvin return path for current-sense resistor; must be routed separately from RTN |
| RTN | Circuit ground | Reference for internal bias circuits and regulation comparators; connects to output capacitor C2 ground |
| FB | Feedback input | Compares against 2.5V reference; requires ≥25 mV ripple for hysteretic operation |
| SS | Softstart control | Internal 12.3 µA current source ramps voltage to delay output rise and limit inrush |
| RON/SD | On-time programming & shutdown | Resistor to VIN sets tON; grounding disables regulator and resets softstart |
| VCC | Startup regulator output | 7.0V supply for internal circuitry; can be externally powered to reduce dissipation |
| NC | No connection | Pins 1, 7, 8, 14 - no internal bond; must remain unconnected or grounded per layout guidelines |
| EP | Exposed thermal pad | Internally connected to substrate; must be soldered to PCB ground plane with multiple vias |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for external compensation components and enables ultra-fast transient response |
| Integrated 33V N-channel buck switch | Reduces BOM count and layout complexity versus external MOSFET solutions |
| No loop compensation required | Enables single-layer PCB implementation and simplifies design validation |
| Adjustable output voltage | Set via external R1/R2 divider referenced to 2.5V FB pin - supports 2.5V to >20V outputs |
| Thermally enhanced HTSSOP-14 package | θJA = 37°C/W (0 LFPM); exposed pad improves heat transfer to PCB ground plane |
| Valley current limit at 1.25A | Provides accurate, temperature-stable overcurrent protection without sensing resistors |
Applications
| Industrial Power Supply | Telecom Secondary Regulation |
|---|---|
Use Scenario: Converting 24V DC distribution rail to 5V/3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering up to 1.25A with fast load-step response to handle digital logic transients. Use Value: Hysteretic control ensures sub-microsecond recovery from 50% load steps, minimizing output droop and eliminating need for complex compensation. | Use Scenario: Post-regulating -48V telecom rectified bus to generate +12V for fan controllers and interface circuitry. IC Role / Device Role / Timing Role: High-input-voltage buck converter operating from 36–72V nominal range with 30V absolute max rating. Use Value: 33V-rated internal switch and 8–30V input range allow direct use without pre-regulator, reducing system cost and footprint. |
| Point-of-Load Converter | High-Voltage Embedded System |
Use Scenario: Generating 1.8V/2.5V for FPGA core or memory rails in industrial edge computing nodes. IC Role / Device Role / Timing Role: Compact, efficient POL regulator with programmable on-time and softstart for controlled power sequencing. Use Value: 12.3 µA SS current source enables precise ramp control via standard capacitor values, easing compliance with ASIC power-up timing specs. | Use Scenario: Powering motor drivers, solenoid controls, or analog front-ends in 24V/30V automotive-grade equipment. IC Role / Device Role / Timing Role: Robust primary DC/DC stage with thermal shutdown (175°C), VCC UVLO (5.7V), and gate-drive UVLO (4.4V). Use Value: Dual-level protection prevents latch-up during cold-crank or load-dump events, improving field reliability without external supervision ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2696MHX/NOPB | Same HTSSOP-14 package and pinout; higher 1.5A current limit and 36V input rating | Supports heavier loads and wider input transients; requires re-evaluation of inductor and diode ratings | Select when >1.25A continuous output or >30V surge tolerance is required |
| TPS54202HDDCR | 4.5–28V input, 2A output, current-mode control with integrated FETs; smaller 8-pin SOIC package | Lacks high-voltage capability but offers better light-load efficiency and integrated softstart/enable | Prefer for lower-input-voltage systems where size and efficiency outweigh 30V+ operation needs |
Compared with LM2695MHX/NOPB, LM2696MHX/NOPB extends safe operating area for higher current and input stress, while TPS54202HDDCR trades voltage headroom for compactness and advanced control features - choice depends on whether 30V+ input resilience or miniaturization dominates the design priority.
Availability
LM2695MHX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom secondary regulation, and high-voltage embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2695MHX/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 over 50 years of innovation in high-reliability power conversion.
The LM2695MHX/NOPB belongs to TI's high-voltage buck regulator product line, engineered for cost-sensitive, thermally constrained applications needing simple, robust DC/DC conversion from 8V–30V inputs without external compensation.
FAQ
What is the minimum input voltage required for reliable startup of the LM2695MHX/NOPB?
The LM2695MHX/NOPB requires a minimum input voltage sufficient to bring VCC above its 5.7V under-voltage lockout (UVLO) threshold. With typical VCC dropout of 1.3V, this corresponds to ≈7.0V at VIN. However, for guaranteed startup across temperature and process variation, TI specifies 8.0V as the minimum operating input voltage per the Absolute Maximum Ratings table in SNVS413A.
How does the LM2695MHX/NOPB achieve constant switching frequency despite varying input voltage and load?
The LM2695MHX/NOPB uses a hysteretic on-time control scheme where tON is inversely proportional to VIN (tON ∝ 1/VIN). As VIN increases, tON decreases, compensating for longer off-times needed to maintain regulation - resulting in near-constant frequency across line and load. This eliminates need for external compensation and enables fast transient response.
Can the LM2695MHX/NOPB operate without an external bootstrap capacitor?
No. The LM2695MHX/NOPB requires a 0.022 µF ceramic capacitor between BST and SW pins to provide gate drive voltage for the internal N-channel buck switch. Without it, the high-side driver cannot function, preventing switching action. TI explicitly specifies this capacitor in the PIN DESCRIPTIONS section and Figure 1 layout guidance.
What is the purpose of the ISEN and SGND pins on the LM2695MHX/NOPB, and how are they used together?
The ISEN pin sinks the recirculating inductor current during the off-time, while SGND provides the Kelvin return path to the internal current-sense resistor. Together, they enable valley current limiting at 1.25A without external sense resistors. SGND must be routed separately from RTN to avoid noise coupling into the current-sense path, ensuring accurate overload detection.
Does the LM2695MHX/NOPB support adjustable switching frequency, and if so, how is it configured?
Yes. Switching frequency is indirectly adjustable via the RON resistor connected between VIN and the RON/SD pin. The on-time tON is calculated as tON = VIN / (1.3 × 10⁻¹⁰ × RON), and frequency is determined by tON and load-dependent off-time. TI provides curves in Figure 4 showing frequency vs. VIN and RON values, enabling designers to select RON for target frequency in continuous conduction mode.
LM2695MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- 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:
- 14-HTSSOP
LM2695MHX/NOPB FAQ
1.How can I place an order for LM2695MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2695MHX/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 LM2695MHX/NOPB reliable?
The price and inventory of LM2695MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2695MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2695MHX/NOPB?
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LM2695MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2695MHX/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 LM2695MHX/NOPB?
For technical support, including LM2695MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2695MHX/NOPB requirements.
6.How does Aetrix verify that LM2695MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2695MHX/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 LM2695MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2695MHX/NOPB?
All LM2695MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2695MHX/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 LM2695MHX/NOPB part is unused and in its original packaging.
Return procedure for LM2695MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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