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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsLM2695MH/NOPB
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LM2695MH/NOPB - Texas Instruments

Manufacturer Part Number
LM2695MH/NOPB
Manufacturer
Texas Instruments
Allelco Part Number
98D-LM2695MH/NOPB
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
46,890 pcs available, New & Original
Parts Description
IC REG BUCK ADJ 1.25A 14HTSSOP
Package
14-HTSSOP
Data sheet
LM2695MH/NOPB.pdf

PCN Design/Specification

Cylindrical Battery Holders.pdf
RoHs Status
ROHS3 Compliant
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In stock: 46890
  • Unit Price: $2.033
  • Subtotal: $0.00

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Specifications

LM2695MH/NOPB Tech Specifications
Texas Instruments - LM2695MH/NOPB technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LM2695MH/NOPB

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Output (Min/Fixed) 2.5V
Voltage - Output (Max) 24V
Voltage - Input (Min) 8V
Voltage - Input (Max) 30V
Topology Buck
Synchronous Rectifier No
Supplier Device Package 14-HTSSOP
Series -
Package / Case 14-PowerTSSOP (0.173', 4.40mm Width)
Product Attribute Attribute Value
Package Tube
Output Type Adjustable
Output Configuration Positive
Operating Temperature -40°C ~ 125°C (TJ)
Number of Outputs 1
Mounting Type Surface Mount
Function Step-Down
Frequency - Switching -
Current - Output 1.25A
Base Product Number LM2695

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

What is the maximum input voltage and how does it impact system design when using the LM2695MH/NOPB buck regulator?
The LM2695MH/NOPB supports a maximum input voltage of 30V, with a minimum of 8V. This wide input range enables use in industrial and automotive environments where supply rails can fluctuate significantly. Designers must ensure that all upstream components—including input capacitors, protection circuits, and feedback networks—are rated for at least 30V to avoid failure under transient conditions. The high-voltage capability also allows direct connection from unregulated sources such as 24V bus systems without requiring pre-regulation stages.
How does the adjustable output voltage feature of the LM2695MH/NOPB affect feedback resistor selection and stability considerations?
The LM2695MH/NOPB provides an adjustable output voltage from 2.5V to 24V via an external resistor divider connected to its FB pin. Choosing appropriate resistor values requires balancing precision against power dissipation and noise sensitivity. For example, selecting Rtop = 100kΩ and Rbot = 10kΩ yields a nominal 2.3V output, but higher resistance values reduce quiescent current at the expense of increased susceptibility to leakage currents and PCB contamination. Stability also depends on proper layout of the feedback path to minimize parasitic capacitance and coupling.
Can the LM2695MH/NOPB be used in a synchronous buck configuration, and what are the trade-offs compared to non-synchronous topologies?
No, the LM2695MH/NOPB uses a standard diode rectification scheme and does not incorporate synchronous rectification. Compared to synchronous alternatives, this results in higher conduction losses and reduced efficiency at light loads, particularly below 20% load current. However, the absence of a dedicated gate driver for the low-side MOSFET simplifies control logic and reduces component count, lowering bill of materials cost and board complexity. In applications where peak efficiency is less critical than simplicity and thermal management, this architecture remains viable.
What are the key differences between the LM2695MH/NOPB and other members of the LM269x family in terms of voltage handling and application suitability?
While the LM2695MH/NOPB features a fixed 30V maximum input and 1.25A output current, some variants in the LM269x series may offer lower input voltage limits or reduced current ratings tailored for specific use cases. For instance, versions optimized for 12V systems might lack robustness against overvoltage transients common in automotive environments. The LM2695’s 8–30V range makes it uniquely suited for distributed power architectures and legacy industrial supplies, whereas other family members may prioritize compactness or ultra-low quiescent current instead of ruggedness.
How does operating temperature range influence derating practices when designing with the LM2695MH/NOPB?
The LM2695MH/NOPB operates from -40°C to +125°C junction temperature, which aligns with extended industrial standards. At elevated ambient temperatures, continuous output current must be derated according to thermal resistance specifications. Assuming a typical θJA of 40°C/W and ambient of 85°C, the available power dissipation drops significantly, potentially limiting sustained output to below rated 1.25A unless adequate heatsinking or airflow is provided. Designers should verify worst-case thermal profiles under full load before finalizing enclosure and layout decisions.
What layout guidelines are critical when implementing the LM2695MH/NOPB to maintain switching performance and minimize electromagnetic interference?
Critical layout practices include placing input and output capacitors as close as possible to the IC pins to minimize loop inductance, using wide traces for high-current paths (especially SW node), and routing feedback signals away from noisy switching nodes. Ground planes help stabilize reference potentials, while minimizing parasitic capacitance in the feedback network ensures phase margin remains above 45° across load variations. Poor layout can lead to instability, overshoot, or radiated emissions exceeding regulatory thresholds even if component selection appears correct.
Is the LM2695MH/NOPB suitable for automotive applications given its packaging and reliability profile?
Although the LM2695MH/NOPB itself is not AEC-Q100 qualified, its wide operating temperature range (-40°C to 125°C) and robust input tolerance make it commonly adopted in automotive auxiliary power modules where environmental stress is moderate. Suppliers often classify NOPB suffix devices as meeting JEDEC reliability standards suitable for harsh environments when implemented with proper design margins. However, customers targeting production automotive platforms should confirm qualification status with their procurement team or consider alternative Q100-compliant regulators if functional safety certification is required.
How does the 14-HTSSOP package impact thermal performance and PCB footprint compared to larger alternatives like SOIC-16?
The 14-pin HTSSOP package measures 4.40mm x 3.00mm with a 0.90mm body height, offering a compact solution ideal for space-constrained designs. Its exposed thermal pad enhances heat transfer to the PCB ground plane, improving junction-to-ambient thermal resistance relative to non-exposed packages. While still inferior to D²PAK or QFN types in absolute thermal capability, it provides sufficient dissipation for 1.25A continuous operation with modest copper area. Compared to wider SOIC-16 footprints, it saves valuable board real estate but requires careful attention to soldering and reflow profiles during assembly.
What precautions should be taken when replacing the LM2695MH/NOPB in an existing design to avoid unintended behavior or damage?
Replacement must account for both electrical and mechanical compatibility. Verify that the substitute device matches input/output voltage ranges, output current capability, switching frequency (if relevant), and package outline including pinout. Even slight deviations—such as a regulator with different soft-start timing or enable logic levels—can disrupt system sequencing or cause brownout resets. Additionally, ensure that the replacement’s thermal characteristics permit operation within original design constraints; substituting a part with higher RθJA could silently degrade reliability under sustained loads.
How does the lack of integrated protection features affect external circuit requirements when using the LM2695MH/NOPB?
The LM2695MH/NOPB does not include built-in protections such as overcurrent, overtemperature, or short-circuit shutdown. Therefore, designers must implement external safeguards—typically through sense resistors, window comparators, or discrete thermal cutoffs—to comply with functional safety or reliability targets. Without these, a fault condition like output shorting could result in uncontrolled current draw and catastrophic failure of downstream components or the regulator itself. Such external monitoring adds complexity but is necessary for mission-critical applications.
What is the significance of the "NOPB" suffix in the LM2695MH/NOPB part number, and how does it influence sourcing and obsolescence risk?
The "NOPB" designation indicates that the device is RoHS-compliant and free of specified hazardous substances per REACH regulations. It does not imply any change in electrical performance but affects manufacturing origin and export classification. Parts marked NOPB are typically sourced from compliant foundries and carry EAR99 ECCN codes, simplifying global distribution logistics. However, because National Semiconductor was acquired by Texas Instruments, long-term availability depends on TI’s product lifecycle strategy; customers should monitor official announcements rather than assume perpetual supply.
In what scenarios would the adjustable output of the LM2695MH/NOPB offer advantages over fixed-output regulators?
Adjustability becomes beneficial when multiple system voltages must be derived from a single input source, reducing inventory complexity and enabling flexible prototyping. For example, a single LM2695MH/NOPB can generate both 5V for digital logic and 3.3V for analog sections from a shared 24V rail, eliminating need for multiple converters. This approach saves board space and cost in modular systems where voltage requirements evolve post-manufacture. Fixed-output parts would require additional regulators or post-regulators, increasing ripple and loss.
How does the switching frequency of the LM2695MH/NOPB influence inductor selection and EMI filtering requirements?
While the datasheet does not specify a fixed switching frequency, typical implementations operate between 200kHz and 500kHz depending on inductor value and compensation settings. Higher frequencies allow smaller magnetics but increase switching losses and conducted emissions. Inductor selection must balance saturation current margin (typically 1.5× expected peak current) with core material permeability and DC resistance. Smaller inductors improve transient response but may exacerbate EMI if layout is suboptimal. Passive filters tuned to the effective switching harmonics are often needed to meet CISPR 22/25 limits.
What role does the soft-start function play in systems using the LM2695MH/NOPB, and how is it configured externally?
Soft-start limits inrush current by gradually raising the internal reference voltage ramp during startup, protecting input sources from voltage droop and preventing excessive capacitor charging currents. On the LM2695MH/NOPB, soft-start is controlled via an external capacitor connected to the SS pin. Typical values range from 0.1µF to 1µF, corresponding to start-up times of 1ms to 10ms. Proper selection avoids excessively long ramps that delay system readiness or too-short ramps that stress input passives during repeated cycling.
How does the absence of a synchronous rectifier compare in efficiency versus modern synchronous buck controllers at various load currents?
At loads above 500mA, synchronous rectification typically improves efficiency by 5% to 15% due to lower forward voltage drop compared to Schottky diodes. The LM2695MH/NOPB’s asynchronous design thus incurs higher conduction losses, especially at elevated output currents. However, at very light loads (<100mA), the diode’s zero gate-drive overhead can yield slightly better efficiency than forced synchronous operation with dead-time penalties. Overall, the trade-off favors synchronous solutions in battery-powered or always-on systems where energy conservation matters most.
What are the implications of using the LM2695MH/NOPB in parallel for higher current applications?
The LM2695MH/NOPB does not support paralleling without additional circuitry because internal references are not matched and control loops will imbalance current sharing. Attempting to parallel units risks one regulator saturating while others remain idle, leading to thermal runaway or premature failure. To achieve higher currents safely, designers must either select a multi-phase controller or implement external current-sharing networks with precision sense resistors and isolation buffers—adding significant complexity and cost.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LM2695MH/NOPB

Product Attribute LM2695MHX/NOPB LM2695SDX/NOPB LM2695SD/NOPB-NS LM2695SD/NOPB
Part Number LM2695MHX/NOPB LM2695SDX/NOPB LM2695SD/NOPB-NS LM2695SD/NOPB
Manufacturer Texas Instruments Texas Instruments National Semiconductor Texas Instruments
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Synchronous Rectifier - - - -
Frequency - Switching - - - -
Topology - - - -
Series - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Voltage - Input (Min) - - - -
Function - - - -
Current - Output - - - -
Number of Outputs - - - -
Voltage - Output (Max) - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Output (Min/Fixed) - - - -
Output Configuration - - - -
Voltage - Input (Max) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount

LM2695MH/NOPB Datasheet PDF

Download LM2695MH/NOPB pdf datasheets and Texas Instruments documentation for LM2695MH/NOPB - Texas Instruments.

PCN Design/Specification
Cylindrical Battery Holders.pdf

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LM2695MH/NOPB Image

LM2695MH/NOPB

Texas Instruments
98D-LM2695MH/NOPB

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