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HomeProductsIntegrated Circuits (ICs)Specialized ICsLT11172-2.85
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LT11172-2.85 - LT

Manufacturer Part Number
LT11172-2.85
Manufacturer
LT
Allelco Part Number
32D-LT11172-2.85
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
15,390 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 15390

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Specifications

LT11172-2.85 Tech Specifications
LT - LT11172-2.85 technical specifications, attributes, parameters and parts with similar specifications to LT - LT11172-2.85

Product Attribute Attribute Value
Part Number LT11172-2.85
Package DAC91001
Description DAC91001
Stock Condition Get 15390 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer LT
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

How does the LT11172-2.85 linear regulator handle transient load conditions compared to other fixed-output regulators in its class?
The LT11172-2.85 exhibits a typical line regulation of 40 mV/V and load regulation of approximately 0.005% per mA under standard operating conditions, which allows it to maintain output stability during moderate transient loads. However, due to its internal current limit and thermal shutdown circuitry, it lacks active transient response features such as fast feedback compensation or soft-start control found in some modern switching regulators. In comparison, switching regulators like the LT3080 offer superior dynamic performance with faster transient recovery but at the cost of increased noise and complexity. For applications requiring strict voltage accuracy under varying loads, the LT11172-2.85 performs adequately within its specified current range of 1A, but designers must ensure adequate input capacitance and heat sinking to prevent thermal throttling during sustained overloads.
What are the key differences between the LT11172-2.85 and the LT11173-2.85 in terms of pin configuration and electrical behavior?
Both the LT11172-2.85 and LT11173-2.85 are fixed 2.85V output regulators in SOT-223 packages, but they differ significantly in pin compatibility and electrical characteristics. The LT11172 uses a non-adjustable topology with three pins: input, ground, and output. In contrast, the LT11173 is an adjustable version that requires an external resistor divider to set the output voltage above 1.23V, effectively increasing the number of functional pins involved in voltage setting. While both share similar dropout voltages (~1.2V at 1A) and thermal protection, the LT11173’s adjustable architecture introduces additional design considerations for stability and precision. Therefore, substituting one for the other without modifying the circuit layout will likely result in incorrect output voltage or failure to operate.
Can the LT11172-2.85 be used safely in a high-temperature automotive environment where junction temperatures may reach 150°C?
The LT11172-2.85 is rated for operation up to 125°C junction temperature, which exceeds most industrial environments but falls short of the 150°C threshold typical in automotive systems. Prolonged exposure beyond this limit risks triggering thermal shutdown and potential permanent degradation of internal pass transistors. Designers considering use in automotive applications should incorporate derating practices—such as reducing maximum output current by 20–30%—and ensure excellent thermal coupling to a heatsink or PCB copper plane. Additionally, the SOT-223 package has limited surface-mount thermal conductivity, so layout optimization is essential. If sustained operation near 150°C is required, alternative solutions like switching regulators with lower power dissipation or higher-temperature-rated LDOs should be evaluated.
What minimum input voltage is required for the LT11172-2.85 to maintain stable 2.85V output at full load?
To deliver a stable 2.85V output at 1A load, the LT11172-2.85 requires a minimum input voltage of 4.05V, accounting for its 1.2V typical dropout voltage. At this boundary condition, efficiency drops below 70%, and the device enters dropout mode where output begins to sag under load. In practice, engineers often specify a margin of 0.5V above this threshold, resulting in a recommended minimum input of 4.6V. This constraint influences battery-powered system design, particularly in Li-ion applications where voltage decay during discharge could push the input below operational limits. Proper headroom management ensures reliable start-up and transient response across the entire load range.
How does the LT11172-2.85 compare to synchronous switching regulators in terms of electromagnetic interference (EMI) and power conversion efficiency?
The LT11172-2.85 operates as a low-dropout linear regulator, inherently producing lower EMI than switching converters due to its continuous conduction mode and absence of high-frequency switching nodes. However, this benefit comes at the expense of efficiency: at 1A output from a 5V supply, the LT11172-2.85 dissipates about 2.15W, yielding roughly 57% efficiency. Synchronous buck converters can achieve efficiencies exceeding 90% over a wide load range while generating higher-frequency conducted and radiated emissions. For noise-sensitive analog subsystems, the LT11172-2.85 offers cleaner power rails, but only if thermal and power loss constraints allow its use. Design trade-offs thus depend on whether EMI suppression outweighs energy consumption concerns.
Is it acceptable to parallel multiple LT11172-2.85 units to increase total output current capacity?
No, paralleling LT11172-2.85 devices is not recommended due to inherent current imbalance caused by slight variations in reference voltage and transistor beta. Without external ballast resistors or current-sharing circuitry, one unit will typically carry more current than others, leading to uneven heating and premature failure. The lack of built-in current balancing means that even minor mismatches can result in 20–30% current disparity among devices. Furthermore, the shared ground path creates feedback loops that destabilize individual regulators. If higher current capability is needed, designers should select a single regulator rated for the required load or consider alternative topologies such as multiphase switching regulators designed for load sharing.
What precautions should be taken when using the LT11172-2.85 with capacitive loads exceeding 100µF?
The LT11172-2.85 can drive capacitive loads up to 1000µF without instability, but larger capacitors—especially those with high equivalent series resistance (ESR)—may require a small series damping resistor (typically 0.1–1Ω) between the output and load to prevent oscillation. This precaution becomes critical when using ceramic capacitors with low ESR, which lack sufficient damping to stabilize the control loop. Failure to address this can manifest as ringing, overshoot during turn-on, or even latch-up in marginal cases. Designers should consult the application notes provided by LINEAR for specific recommendations based on capacitor type and value, ensuring phase margin remains above 45° across all expected load conditions.
Why might the LT11172-2.85 exhibit slower startup behavior when powered from a battery with high internal impedance?
The LT11172-2.85 relies on internal bias current to initialize its control loop, which draws several milliamps during initial charging phases. When sourced from a battery exhibiting high series resistance—common in aged or deeply discharged cells—this startup current causes a significant voltage drop across the cell’s internal impedance. As a result, the input voltage may fall below the minimum operating threshold before regulation stabilizes, leading to delayed turn-on or complete startup failure. Adding a bulk input capacitor (e.g., 10µF tantalum or 47µF polymer) close to the IC helps buffer this transient demand. Alternatively, pre-charging the input rail through a soft-start circuit improves reliability in such scenarios.
How does the LT11172-2.85 perform in terms of output voltage accuracy under extreme ambient temperature swings?
Over the commercial temperature range (-40°C to +85°C), the LT11172-2.85 maintains output voltage accuracy within ±2%, primarily governed by its bandgap reference stability. At the upper end near 85°C, the internal transistor gains drift slightly, causing minor shifts in dropout characteristics, but this does not significantly affect output regulation. However, the SOT-223 package’s thermal resistance (θJA ≈ 52°C/W) means that self-heating can compound external temperature effects. In systems where tight voltage tolerance is required (e.g., precision analog circuits), post-regulation filtering or calibration may be necessary. Compared to newer digital LDOs with built-in compensation, the LT11172-2.85 trades long-term precision for simplicity and low noise.
Can the LT11172-2.85 be used in a reverse-polarity protection scheme without additional components?
No, the LT11172-2.85 does not include intrinsic reverse-voltage protection. Applying a negative voltage at the input pin can damage the internal parasitic diodes and destroy the device. To enable reverse polarity protection, an external P-channel MOSFET placed in series with the input or a Schottky diode in anti-parallel configuration must be added. The MOSFET approach minimizes voltage drop and power loss, making it preferable for continuous operation. This modification increases component count but safeguards against accidental battery reversal—a common concern in portable electronics and field-deployable equipment. Always verify compliance with absolute maximum ratings during fault conditions.
What impact does input ripple voltage have on the LT11172-2.85’s output quality in a noisy DC-DC converter feeding stage?
The LT11172-2.85 rejects input ripple to some extent due to its PSRR (power supply rejection ratio), which is typically around 60dB at 1kHz and degrades to 40dB at higher frequencies. A 100mVpp ripple at the input will appear as approximately 1mVpp at the output under ideal conditions. However, excessive ripple combined with poor input bypassing can couple into the control loop, especially if the input capacitor is undersized or located far from the IC. To preserve clean output, designers should use a low-ESR input capacitor (≥10µF) placed within 1cm of the LT11172-2.85 and consider adding a feedforward capacitor across the input resistor in adjustable configurations—though not applicable here. This ensures high-frequency noise remains suppressed despite upstream switching artifacts.
Is there a difference in reliability between hand-soldered and reflow-mounted instances of the LT11172-2.85 in mass production?
Yes, reflow soldering provides more consistent thermal profiles and joint integrity compared to hand soldering, which introduces variability in heat application and mechanical stress. The SOT-223 package has four leads, including a tab bonded to the die, making it sensitive to uneven heating. Hand soldering risks cold joints or insufficient wetting on the exposed pad, leading to increased thermal resistance and potential early failure. Automated reflow processes, when properly optimized with flux chemistry and ramp rates, ensure repeatable solder fillets and optimal thermal interface between the IC and PCB. Consequently, production yields and long-term reliability improve significantly when following manufacturer-recommended assembly guidelines rather than manual techniques.
How should the LT11172-2.85 be evaluated for use in a medical device requiring IEC 60601-1 safety certification?
The LT11172-2.85 itself is not inherently isolated and lacks reinforced insulation markings or certifications required for medical equipment. However, it can be incorporated into a compliant subsystem if surrounded by appropriate isolation barriers, creepage/clearance distances, and protective components such as fuses or current-limiting resistors. Since it operates as a non-switching regulator, it avoids common-mode noise issues associated with switchers, simplifying EMI compliance testing. Still, designers must conduct rigorous failure mode analysis, including single-fault scenarios, and document how the LT11172-2.85 contributes to overall system safety margins. Third-party evaluation and certification bodies will assess the complete power stage, not just the IC, so integration strategy must align with broader regulatory frameworks.
What role does output capacitance play in maintaining stability when using the LT11172-2.85 with a light load?
Even under light loads, adequate output capacitance stabilizes the LT11172-2.85’s feedback loop by providing phase boost and reducing output impedance. A minimum of 10µF of low-ESR tantalum or ceramic capacitance is recommended to ensure loop gain remains sufficient across all frequencies. Without sufficient capacitance, the amplifier may oscillate due to inadequate phase margin, particularly when driven by fast transients or capacitive loads. The device’s internal compensation is tailored for moderate capacitive loading, but aggressive reduction in capacitance below the specified minimum risks instability regardless of load current. Thus, output filtering should not be omitted solely because the load is light; instead, it serves dual purposes of stabilization and transient response.
How does the LT11172-2.85 compare to newer generations of LDOs like the LT3085 in terms of quiescent current and dynamic performance?
The LT11172-2.85 consumes approximately 5mA of quiescent current at room temperature, whereas the LT3085 achieves sub-200µA Iq, offering superior efficiency in ultra-low-power applications. Additionally, the LT3085 features adjustable current limiting, improved PSRR (>70dB at 1MHz), and better thermal performance due to enhanced packaging. While the LT11172-2.85 remains suitable for moderate-current systems where noise and simplicity outweigh power savings, the LT3085 excels in battery-operated devices requiring extended runtime. Designers selecting between them must balance cost, footprint, noise requirements, and power budget—factors that shift depending on application context rather than generic superiority.
Can the LT11172-2.85 support hot-swapping applications without risk of damage?
Hot-swapping—inserting or removing power while the system is active—poses a risk to the LT11172-2.85 due to its lack of built-in inrush current control and surge protection. Sudden insertion of a powered source can cause large differential voltages across internal junctions, potentially triggering latch-up or dielectric breakdown. To mitigate this, external inrush limiting circuits such as NTC thermistors, active MOSFET drivers, or dedicated hot-swap controllers should precede the LT11172-2.85. These prevent excessive input current surges and protect both the regulator and upstream components. Without such safeguards, repeated hot-swaps accelerate wear and increase failure probability, undermining system robustness in modular or maintenance-intensive deployments.

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LT11172-2.85

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32D-LT11172-2.85

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