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Texas Instruments LM2695MHX
- Part No.:
- LM2695MHX
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2695MHX.pdf
- Description:
- IC REG BUCK ADJ 1.25A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,479
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Product details
Overview
LM2695MHX 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 (FB = 2.5V reference), and targets secondary post-regulation in telecom and industrial power supplies.
For engineers reviewing the LM2695MHX datasheet, LM2695MHX pinout, LM2695MHX application, or LM2695MHX equivalent, key selection criteria include its hysteretic control architecture (no loop compensation), fixed-frequency behavior under line/load variation, 1.25A current limit, thermal shutdown at 175°C, and WSON-10 package thermal pad for enhanced dissipation.
Technical Context
The LM2695MHX implements a hysteretic on-time control scheme where switching frequency remains stable across input voltage (8V–30V) and load changes 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 occurs during off-time via valley sensing at ISEN/SGND (130 mΩ internal sense resistor), holding the switch off until recirculating current falls below 1.25A. Startup is managed by an integrated 7.0V VCC regulator with 5.7V UVLO, and softstart is implemented via 12.3 µA internal current source charging external SS capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 30V - supports wide-range industrial and telecom inputs; absolute max 33V. |
| Output Current Limit | 1.25A valley current - sets maximum sustainable load; peak switch current up to 2A. |
| Feedback Reference | 2.5V ±1% - enables precise output adjustment using R1/R2 divider; low 1 nA bias current. |
| Switch RDS(on) | 0.33 Ω typical - reduces conduction loss at full load; rated for 33V drain-source breakdown. |
| Startup Regulator | VCC = 7.0V ±0.4V - powers internal circuitry; UVLO threshold 5.7V with 150 mV hysteresis. |
| Thermal Shutdown | 175°C activation with 20°C hysteresis - protects against sustained overload or poor heatsinking. |
| Softstart Current | 12.3 µA - determines ramp time via external SS capacitor; internal clamp at 2.5V. |
Pinout & Package
LM2695MHX is packaged in thermally enhanced 10-pin WSON (4 mm × 4 mm) with exposed thermal pad. The package supports high-power density designs and requires PCB ground plane connection to the EP for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching Node | Connects to inductor, freewheeling diode cathode, and bootstrap capacitor; carries high dI/dt ripple current. |
| 2 BST | Bootstrap Supply | Accepts 0.022 µF capacitor from SW; charges via internal diode during off-time to drive high-side gate. |
| 3 ISEN | Current Sense Output | Sinks recirculating current during off-time; used with SGND to set 1.25A valley current limit. |
| 4 SGND | Sense Ground Return | Provides dedicated return path for current-sense resistor; isolated from RTN to avoid noise coupling. |
| 5 RTN | Circuit Ground Reference | Reference for all internal logic and regulation circuits except current-sense path. |
| 6 FB | Feedback Input | Compares output voltage (via R1/R2 divider) to 2.5V reference; <1 nA input bias ensures accuracy. |
| 7 SS | Softstart Control | Charged by 12.3 µA current source; ramps regulation reference to prevent inrush and overshoot. |
| 8 RON/SD | On-Time Programming / Shutdown | Resistor from VIN sets tON; grounding disables regulator and resets softstart. |
| 9 VCC | Startup Regulator Output | 7.0V supply for internal circuitry; can be externally biased (8–14V) to reduce dissipation. |
| 10 VIN | Main Input Supply | Accepts 8–30V DC; transient-rated to 33V; connects internally to VCC via diode. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic On-Time Control | Eliminates external compensation components; achieves ultra-fast transient response without stability tuning. |
| Integrated 33V N-Channel Buck Switch | Reduces BOM count and layout complexity; RDS(on) = 0.33 Ω minimizes conduction loss at 1.25A. |
| Self-Biasing Startup Regulator | VCC = 7.0V output eliminates need for auxiliary bias supply; supports direct 8–30V input connection. |
| Valley Current Limit Protection | 1.25A threshold with 150 ns response ensures robust short-circuit and overload handling. |
| Thermally Enhanced WSON-10 | θJA = 37°C/W (0 LFPM); exposed pad enables efficient heat transfer to PCB ground plane. |
Applications
| Telecom Secondary Post-Regulator | Industrial Point-of-Load Converter |
|---|---|
|
Use Scenario: Down-converting 24V or 48V intermediate bus to 3.3V/5V for FPGA, DSP, or ASIC core rails in telecom equipment. IC Role / Device Role / Timing Role: Primary buck controller providing regulated, high-efficiency DC-DC conversion with fast load-step response. Use Value: Enables compact, high-reliability POL design without compensation network; supports 30V input transients common in telecom systems. |
Use Scenario: Generating 12V or 15V bias rails from 24V factory automation PLC power buses. IC Role / Device Role / Timing Role: High-voltage step-down regulator delivering stable 1.25A output with thermal fault protection. Use Value: Eliminates need for pre-regulator stages; 175°C thermal shutdown prevents field failures in enclosed enclosures. |
| High-Voltage LED Driver Bias Supply | Non-Isolated Automotive Subsystem Rail |
|
Use Scenario: Powering constant-current LED driver ICs requiring clean, adjustable 5–12V bias in signage or lighting systems. IC Role / Device Role / Timing Role: Efficient, low-noise buck converter supplying regulated gate-drive or analog bias voltage. Use Value: Adjustable output via FB divider allows optimization for different driver IC requirements; low 1 nA FB bias improves accuracy. |
Use Scenario: Generating 5V or 3.3V for infotainment microcontrollers or sensors from 12V/24V vehicle battery (with transient protection). IC Role / Device Role / Timing Role: Robust buck regulator operating across automotive cold-crank (6V) to load-dump (36V) conditions. Use Value: 30V continuous rating and 33V transient capability meet ISO 7637-2 pulse requirements; no loop compensation simplifies EMI filtering. |
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 3–65V input range; 150 mA output; integrated FET; requires external compensation. | Lower current capacity; suited for ultra-low-power automotive modules, not 1.25A loads. | Select when input exceeds 30V or AEC-Q100 qualification is mandatory; not drop-in for LM2695MHX's 1.25A requirement. |
| TPS54202DDCR | 2–18V input; 2A output; current-mode control; requires compensation; SOIC-8 package. | Limited to ≤18V input; lacks 30V rating and valley-current protection of LM2695MHX. | Choose for cost-sensitive, lower-input-voltage designs where thermal pad and 30V operation are unnecessary. |
Compared with LM5165QPWPRQ1 and TPS54202DDCR, the LM2695MHX uniquely combines 30V input capability, 1.25A valley-current limiting, and hysteretic control in a thermally optimized WSON-10 package-making it optimal for high-voltage, medium-current POL applications where simplicity and transient robustness are critical.
Availability
LM2695MHX 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 LM2695MHX 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 decades of expertise in high-reliability power conversion ICs.
The LM2695MHX belongs to TI's high-voltage buck regulator product line, designed specifically for non-isolated, medium-current DC-DC conversion in telecom, industrial, and automotive subsystems where input voltages exceed 24V.
FAQ
What is the maximum input voltage rating for the LM2695MHX?
The LM2695MHX has an absolute maximum input voltage (VIN to RTN) of 33V, with recommended continuous operation from 8V to 30V. Exceeding 30V may trigger overvoltage stress on internal structures; the 33V rating applies only to short-duration transients per the Absolute Maximum Ratings table in the SNVS413A datasheet. For reliable long-term operation, keep VIN ≤30V.
Does the LM2695MHX require external compensation components?
No, the LM2695MHX uses a hysteretic on-time control architecture that eliminates the need for external compensation networks. This simplifies design, reduces component count, and guarantees stability across all operating conditions-unlike voltage-mode or current-mode controllers that require careful loop compensation tuning.
How is output voltage adjusted on the LM2695MHX?
Output voltage is set using a resistive divider (R1 and R2) from VOUT to FB and FB to RTN. The LM2695MHX regulates FB to 2.5V, so VOUT = 2.5 × (1 + R1/R2). Standard 1% resistors in the 1–10 kΩ range are recommended; minimum ESR requirements for C2 must also be met to ensure sufficient FB ripple (≥25 mVpp) for proper hysteretic operation.
What is the purpose of the ISEN and SGND pins on the LM2695MHX?
The ISEN pin sinks the recirculating inductor current during the off-time, while SGND provides its dedicated return path to the internal 130 mΩ current-sense resistor. Together, they enable valley-current limiting at 1.25A. Separating this path from the main RTN ground prevents noise coupling into regulation circuitry and ensures accurate current detection independent of load-ground disturbances.
Can the LM2695MHX operate without the external bootstrap capacitor?
No-the LM2695MHX requires a 0.022 µF ceramic capacitor between BST and SW to supply gate drive voltage for the integrated N-channel buck switch. Without it, the high-side driver cannot turn on fully, resulting in excessive RDS(on), thermal runaway, and immediate failure. The capacitor recharges through an internal diode during each off-time, relying on the minimum 250 ns off-time specification.
LM2695MHX 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 FAQ
1.How can I place an order for LM2695MHX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2695MHX 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 reliable?
The price and inventory of LM2695MHX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2695MHX is usually 5 days.
3.What payment methods are accepted for LM2695MHX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2695MHX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2695MHX?
LM2695MHX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2695MHX 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?
For technical support, including LM2695MHX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2695MHX requirements.
6.How does Aetrix verify that LM2695MHX is sourced from the original manufacturer or authorized distributors?
All LM2695MHX 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 meets industry standards.
7.What is the process for return or replacement of LM2695MHX?
All LM2695MHX units undergo pre-shipment inspection (PSI). If there is an issue with LM2695MHX, 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 part is unused and in its original packaging.
Return procedure for LM2695MHX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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