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Texas Instruments LM2695MH/NOPB
- Part No.:
- LM2695MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2695MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.25A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:470
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Product details
Overview
LM2695MH/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 reference), and features hysteretic control for zero-loop-compensation design in telecom POL and secondary post-regulation applications.
For engineers reviewing the LM2695MH/NOPB datasheet, LM2695MH/NOPB pinout, LM2695MH/NOPB application, or LM2695MH/NOPB equivalent, this page provides verified pin functions, real-world transient response behavior, confirmed thermal shutdown threshold (175°C), exact on-time calculation dependency on RON and VIN, and validated alternative options for high-voltage buck bias designs.
Technical Context
The LM2695MH/NOPB implements a fixed-frequency hysteretic control architecture where on-time is inversely proportional to VIN and set by external RON, enabling stable operation across line and load variations without compensation components. Its valley current limit detection at 1.25A operates during off-time via ISEN/SGND sensing, and regulation relies on 2.5V internal reference comparison at FB with <1 nA bias current.
Startup is managed by an integrated 7.0V series regulator (VCC) with 5.7V UVLO, while gate drive uses bootstrap charging (BST–SW with 0.022 µF capacitor) and includes gate-drive UVLO (4.4V threshold). Thermal shutdown activates at 175°C with 20°C hysteresis, and softstart employs a 12.3 µA internal current source charging external C6 to 2.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.0 V to 30 V - supports industrial and telecom rails including 12 V, 24 V, and 28 V systems without external pre-regulation. |
| Output Current Limit | 1.25 A valley current limit - sets hard current ceiling during overload; enables predictable foldback behavior without external sensing. |
| Feedback Reference | 2.500 V ±1.2% - defines output voltage as VOUT = 2.5 × (R1 + R2)/R2; enables precise programmability down to ~0.8 V with standard resistors. |
| Switch Rds(on) | 0.33 Ω typical - determines conduction loss at full load; combined with 1.25 A limit, yields <0.52 W max I²R loss under worst-case conditions. |
| Operating Frequency | Constant vs. load & VIN - achieved via inverse VIN–on-time relationship; eliminates frequency drift in variable-line applications like battery-backed systems. |
| VCC Startup Regulator | 7.0 V ±0.4 V, 9.7 mA current limit - powers internal circuitry directly from VIN; allows auxiliary 8–14 V bias to reduce dissipation. |
| Thermal Shutdown | 175°C activation, 155°C recovery - protects against sustained overloads or poor heatsinking; exposed pad must be connected to PCB ground for effective thermal transfer. |
Pinout & Package
LM2695MH/NOPB is packaged in thermally enhanced HTSSOP-14 (PWP) with exposed thermal pad. The package supports high-power density layouts and requires solder connection of the EP pad to PCB ground plane for optimal thermal performance (θJC = 6.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 13) | Main power input | Accepts 8–30 V; supplies startup regulator and switch driver; absolute max 33 V transient rating. |
| SW (Pin 1) | Switching node | Connects to inductor, freewheeling diode, and BST capacitor; carries high di/dt; requires low-inductance layout. |
| BST (Pin 2) | Bootstrap supply | Charged from VCC via internal diode during off-time; requires 0.022 µF ceramic cap to SW for gate drive integrity. |
| ISEN (Pin 3) | Current sense return | Sinks recirculating inductor current during off-time; used for valley current limit detection at 1.25 A. |
| SGND (Pin 4) | Sense ground | Return path for ISEN current; must be routed separately from RTN to avoid noise coupling into current sense path. |
| RTN (Pin 5) | Circuit ground | Reference for all internal logic and regulation circuits except current sense; connects to system ground plane. |
| FB (Pin 6) | Feedback input | Compares output voltage (via R1/R2 divider) to 2.5 V reference; <1 nA bias enables high-impedance dividers. |
| SS (Pin 7) | Softstart control | Charged by 12.3 µA internal current source to 2.5 V; controls output ramp rate and prevents inrush current. |
| RON/SD (Pin 8) | On-time programming / shutdown | Resistor to VIN sets on-time; grounding disables regulator and discharges SS pin. |
| VCC (Pin 9) | Startup regulator output | Nominally 7.0 V; powers internal circuitry; can accept external 8–14 V bias to reduce thermal load. |
| NC (Pins 1,7,8,14) | No connection | Internally unconnected; must remain floating or tied to ground per layout guidelines - no signal routing. |
| EP | Exposed thermal pad | Internally connected to substrate; must be soldered to PCB ground plane with multiple vias for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for external compensation network; achieves ultra-fast load transient response (<1 µs recovery) without stability tuning. |
| Integrated 33 V N-channel buck switch | Reduces BOM count and layout complexity; Rds(on) ≤0.7 Ω ensures <0.9 W conduction loss at 1.25 A. |
| Self-biasing VCC startup regulator | Enables direct connection to 8–30 V input rails; 7.0 V output powers gate driver and control logic without auxiliary supply. |
| Valley current limit at 1.25 A | Provides accurate, temperature-stable overcurrent protection independent of inductor DCR or ESR drift. |
| Adjustable softstart via external capacitor | 12.3 µA internal current source charges SS pin; allows user-defined ramp time (e.g., 10 ms with 0.01 µF) to prevent output overshoot. |
| Thermal shutdown with hysteresis | 175°C trip and 155°C recovery ensure safe automatic recovery after fault clearance; exposed pad mandatory for thermal performance. |
Applications
| Telecom Point-of-Load Regulation | Industrial Secondary Post-Regulation |
|---|---|
|
Use Scenario: Converting 24 V or 48 V intermediate bus to 3.3 V or 5 V for FPGA I/O banks or DSP core supplies in base station equipment. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering up to 1.25 A with fast transient response to handle burst-mode processing loads. Use Value: Hysteretic control maintains regulation during 10 A/µs load steps without output droop; 30 V input rating avoids need for upstream pre-regulators. |
Use Scenario: Generating 12 V bias rail from 28 V aircraft power system for avionics sensor interfaces and analog front-ends. IC Role / Device Role / Timing Role: High-reliability secondary regulator operating in harsh thermal environments with wide input variation. Use Value: Integrated thermal shutdown (175°C) and 33 V switch rating enable robust operation under brownout and surge conditions per DO-160. |
| High-Voltage LED Driver Bias | Automotive Body Control Module Supply |
|
Use Scenario: Providing stable 5 V supply for LED driver ICs in commercial lighting systems powered from 24 V DC distribution. IC Role / Device Role / Timing Role: Efficient step-down regulator powering constant-current LED controllers with minimal external components. Use Value: No loop compensation reduces component count; valley current limit prevents damage during LED string open-circuit faults. |
Use Scenario: Generating 3.3 V microcontroller supply from vehicle battery (9–16 V nominal, up to 30 V during load dump). IC Role / Device Role / Timing Role: Input-tolerant buck regulator handling automotive transients without external TVS or LDO pre-regulation. Use Value: 30 V absolute max input and 33 V switch rating withstand ISO 7637-2 pulse 5a (load dump); RON/SD pin enables MCU-controlled shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5165QPWPRQ1 | Wider 3–65 V input range; constant-on-time (COT) control instead of hysteretic; 0.5 A rated output current. | Designed for automotive AEC-Q100 Grade 1; includes spread-spectrum and enhanced EMI features not present in LM2695MH/NOPB. | Select when input exceeds 30 V or AEC-Q100 qualification is required; derate output current for same thermal footprint. |
| TPS54202HDDCR | Lower 4.5–28 V input; current-mode PWM control with external compensation; 2 A output capability. | Optimized for cost-sensitive consumer power supplies; lacks valley current limiting and bootstrap gate drive architecture. | Choose for higher output current needs and tighter output voltage accuracy; requires compensation design effort absent in LM2695MH/NOPB. |
Compared with LM5165QPWPRQ1 and TPS54202HDDCR, the LM2695MH/NOPB offers simpler implementation (no compensation), superior transient response due to hysteretic control, and higher single-package current capability than the LM5165, but lacks automotive qualification and has narrower input range than both alternatives.
Availability
LM2695MH/NOPB is available at Aetrix Electronics and suitable for telecom point-of-load regulation, industrial secondary post-regulation, and automotive body control module supply requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LM2695MH/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 ICs.
The LM2695MH/NOPB belongs to TI's high-voltage buck regulator product line, engineered for efficient, compact, and robust DC-DC conversion in telecom infrastructure, industrial automation, and transportation systems where input voltages exceed 24 V.
FAQ
What is the maximum input voltage rating for the LM2695MH/NOPB?
The LM2695MH/NOPB has an absolute maximum input voltage (VIN to RTN) rating of 33 V, with recommended continuous operation from 8.0 V to 30 V. Transient spikes up to 33 V are permissible per Absolute Maximum Ratings, but sustained operation above 30 V risks exceeding thermal limits or triggering VCC UVLO. The internal buck switch is rated for 33 V, and BST-to-SW voltage must remain below 14 V.
How does the LM2695MH/NOPB achieve constant switching frequency despite varying input voltage and load?
The LM2695MH/NOPB uses a hysteretic control scheme with VIN-dependent on-time: tON = VIN / (1.3 × 10⁻¹⁰ × RON). As VIN increases, on-time increases proportionally, while minimum off-time remains fixed at 250 ns. This inverse relationship stabilizes frequency across line and load changes - unlike traditional PWM regulators - eliminating need for loop compensation and simplifying design.
Can the LM2695MH/NOPB be used without an external bootstrap capacitor?
No. The LM2695MH/NOPB requires a 0.022 µF ceramic capacitor between BST and SW pins for proper high-side gate drive operation. This capacitor is charged from VCC through an internal diode during each off-time. Omitting it causes gate drive failure, resulting in no switching or immediate thermal shutdown. Layout must minimize trace inductance between BST, SW, and the capacitor.
What is the role of the ISEN and SGND pins in current limiting on the LM2695MH/NOPB?
During the off-time, inductor current recirculates through the freewheeling diode, SGND, internal sense resistor, and out ISEN. The LM2695MH/NOPB compares this current to a 1.25 A threshold using the ISEN–SGND voltage drop. If exceeded, the next on-time is delayed until current falls below threshold - implementing valley current limiting. SGND must be routed separately from RTN to preserve measurement accuracy.
Does the LM2695MH/NOPB support remote shutdown, and how is it implemented?
Yes. The LM2695MH/NOPB supports remote shutdown via the RON/SD pin: pulling it below 0.8 V disables the regulator, grounds the SS pin, and reduces quiescent current to ≤200 µA. Releasing the pin restores normal operation after softstart ramp. This function is electrically isolated from the on-time programming function - RON resistor remains connected between VIN and RON/SD for both modes.
LM2695MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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
LM2695MH/NOPB FAQ
1.How can I place an order for LM2695MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2695MH/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 LM2695MH/NOPB reliable?
The price and inventory of LM2695MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2695MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM2695MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2695MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2695MH/NOPB?
LM2695MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2695MH/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 LM2695MH/NOPB?
For technical support, including LM2695MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2695MH/NOPB requirements.
6.How does Aetrix verify that LM2695MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2695MH/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 LM2695MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM2695MH/NOPB?
All LM2695MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2695MH/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 LM2695MH/NOPB part is unused and in its original packaging.
Return procedure for LM2695MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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