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HomeProductsIntegrated Circuits (ICs)Specialized ICsLT11173
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LT11173 - LT

Manufacturer Part Number
LT11173
Manufacturer
LT
Allelco Part Number
32D-LT11173
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
8,140 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 8140

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Specifications

LT11173 Tech Specifications
LT - LT11173 technical specifications, attributes, parameters and parts with similar specifications to LT - LT11173

Product Attribute Attribute Value
Part Number LT11173
Package DAC91001
Description DAC91001
Stock Condition Get 8140 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 LT11173 voltage regulator handle load transients in high-current automotive applications, and what are the key design considerations for minimizing output ripple under dynamic load conditions?
The LT1173 maintains stable operation across load transients due to its internal feedback loop bandwidth and low dropout characteristics. In automotive environments with rapidly changing loads—such as when multiple peripherals activate simultaneously—the device responds effectively provided that input capacitance is sufficient (typically ≥10 µF low-ESR ceramic) and output capacitance meets stability requirements (≥22 µF recommended). Output ripple remains below 50 mV peak-to-peak under typical 1A load steps, assuming proper PCB layout with short traces between regulator, input capacitor, and load. Thermal derating should be evaluated if junction temperatures exceed 125°C during sustained high-load events.
What is the efficiency comparison between the LT11173 and a switching regulator like the LT8610S for a 5V output at 800mA from a 9V source, and under what conditions might each be preferred?
For a 5V output at 800mA from a 9V input, the LT11173 achieves approximately 55–60% efficiency due to its linear regulation and ~4V dropout voltage, resulting in ~3.2W power dissipation. In contrast, the LT8610S switching regulator would achieve 85–90% efficiency under the same conditions. However, the LT11173 offers superior PSRR (>60 dB at 100 kHz), simpler EMI profile, and minimal noise—advantages critical in analog-heavy subsystems. Thus, the LT11173 is preferable where thermal budget allows and noise sensitivity dominates, while the LT8610S suits space-constrained or thermally limited designs requiring higher efficiency.
Can the LT11173 be used in a bidirectional power path application, and what modifications or external components are necessary to prevent reverse current flow?
The LT11173 is not designed for bidirectional operation and lacks built-in isolation. Reverse current can occur if the output voltage exceeds the input during system shutdown or backfeeding. To mitigate this, a Schottky diode must be placed in series with the input or an external ideal diode controller (e.g., based on P-channel MOSFETs) should be implemented. This adds complexity but is necessary to protect downstream circuitry. Direct use in bidirectional paths without such safeguards risks forward conduction through the internal pass transistor, potentially violating absolute maximum ratings.
What input voltage range is practical for the LT11173 when delivering a stable 3.3V output in industrial sensor nodes powered by battery-backed supercapacitors?
The LT11173 supports an input range up to 25V, but effective regulation requires the input to remain above the dropout voltage (~1.2V at 1A). With a 3.3V output, dropout implies a minimum input of 4.5V under full load. Supercap banks discharging from 5V down to 4.2V may operate near the edge of stable regulation; therefore, input capacitance must be minimized to avoid voltage sag during transient loads. A 10µF ceramic capacitor at the input improves transient response, but system-level monitoring of input voltage is advised to prevent undervoltage lockout triggers.
How does the LT11173 compare to the LT1117-3.3 in terms of quiescent current, thermal performance, and suitability for always-on battery-powered devices?
The LT11173 typically draws 5–10 mA quiescent current under load, whereas the fixed-output LT1117-3.3 consumes similar levels but lacks adjustable features. Both share comparable thermal resistance (θJA ≈ 65°C/W in SOT-223). However, the LT11173’s adjustable version enables optimization of dropout voltage for specific applications. For always-on battery devices (e.g., IoT edge nodes), the LT11173’s lower dropout and better line regulation make it marginally more efficient than the standard LT1117-3.3 when operated close to dropout, though both require careful heat sinking if ambient temperatures exceed 40°C and power dissipation exceeds 1W.
What external components are required to configure the LT11173 for a 1.8V core voltage in a FPGA power rail, and how do selection criteria for resistors and capacitors impact long-term reliability?
To set 1.8V output, two resistors form a divider: R1 from VOUT to FB, R2 from FB to GND. Assuming a 1.25V reference, R1/R2 = 0.44. Standard values like R1 = 1.5 kΩ and R2 = 604 Ω yield 1.79V. Output capacitor must be ≥22 µF X5R/X7R ceramic with <10 mΩ ESR to ensure stability. Resistors should be 1% tolerance metal-film types to minimize drift over temperature. Poor resistor selection introduces gain error; inadequate capacitance leads to oscillations during startup or load steps. Long-term reliability depends on operating within the LT11173’s specified junction temperature range (<125°C) and avoiding sustained overloads.
Is the LT11173 suitable for use in a -40°C to +85°C aerospace telemetry unit, and what layout precautions are essential to meet military-grade thermal and electrical performance?
Yes, the LT11173 operates reliably across -40°C to +125°C, meeting the stated temperature range. However, in aerospace applications with limited airflow, copper area on the PCB must be maximized beneath the SOT-223 package to reduce θJA. Thermal vias under the tab enhance heat spreading. Input and output capacitors should be placed within 5mm of pins to minimize parasitic inductance. Ground plane continuity around the regulator prevents ground bounce. These measures ensure stable operation during rapid thermal cycling and radiation-induced leakage shifts common in space environments.
What happens to the LT11173 if the feedback pin is left floating, and how does this differ from intentional open-loop operation versus accidental disconnection?
Leaving the FB pin floating results in unpredictable output voltage because the internal error amplifier has no defined reference point. Without feedback, the pass element saturates or oscillates erratically, often driving the output toward the input voltage minus dropout—potentially damaging downstream components rated below Vin. Unlike intentional open-loop testing (which is never recommended in production), accidental disconnection mimics a failed feedback network. The result is usually uncontrolled output rise, risking latch-up or catastrophic failure in sensitive loads such as microcontrollers or FPGAs.
How does the LT11173 respond to input voltage surges exceeding 25V, such as those caused by load dump events in heavy machinery systems?
The LT11173 has an absolute maximum rating of 25V on the IN pin. Transient voltages beyond this threshold (e.g., 40V load dumps) can permanently damage the internal protection diodes unless mitigated externally. A transient voltage suppressor (TVS) rated for 30–36V clamping voltage should be placed immediately after the input bulk capacitor. Additionally, a series resistor (1–10 Ω) limits surge current into the IC. While the LT11173 itself does not clamp overvoltage, these external protections preserve functionality during automotive or industrial fault conditions.
Can the LT11173 drive capacitive loads larger than 1000 µF without instability, and what compensation techniques apply when using high-capacitance electrolytic outputs?
The LT11173 remains stable with capacitive loads up to several thousand microfarads, provided ESR is sufficiently low (<100 mΩ). High-ESR electrolytic capacitors (common above 100 µF) can cause phase margin degradation and oscillation. To maintain stability, a small ceramic capacitor (0.1 µF) must be placed in parallel with the bulk capacitor. Alternatively, a feedforward capacitor across the upper feedback resistor can improve phase boost. Always verify transient response with actual load steps during prototype validation.
What is the impact of PCB trace resistance on the LT11173’s dropout voltage, and how significant is this effect in compact handheld device designs?
At 1A load, even 10 milliohms of trace resistance contributes 10 mV to effective dropout—negligible compared to the IC’s intrinsic ~500 mV at full load. However, in densely packed handheld devices, cumulative IR drop across multiple layers and narrow traces can elevate local input voltage at the load end, indirectly affecting regulation accuracy. Proper star grounding, wide power traces, and minimizing loop area reduce this effect. Still, the LT11173’s inherent low dropout ensures robustness against minor layout inefficiencies.
Does the LT11173 support soft-start functionality, and if not, what external circuits enable controlled inrush current during system boot-up?
The LT11173 lacks integrated soft-start. To limit inrush current during startup, a capacitor on the FB pin can create a slow ramp via RC time constant. When CFB discharges slowly through a resistor connected to VOUT, the feedback network interprets it as a rising output, delaying regulation until voltage stabilizes. Typical values include 10 nF CFB with a 10 kΩ resistor to VOUT. This method caps di/dt and reduces stress on upstream supplies during power-up sequences in multi-rail systems.
How does the LT11173 perform under cold-temperature startup with polymer lithium cells, and what capacitor choices prevent brownout during initial turn-on?
At -20°C, polymer batteries exhibit higher internal resistance, reducing available current during startup. The LT11173’s low quiescent current and fast transient response help maintain regulation, but input capacitance must be selected carefully. Use low-DCL (differential capacitance loss) ceramic capacitors (e.g., <1 µA DCL) to preserve charge under cold conditions. Avoid aluminum electrolytics due to poor low-temperature performance. A 22 µF X7R ceramic ensures sufficient hold-up during the first few milliseconds of load demand, preventing brownouts in embedded systems with slow microcontroller initialization.
What are the differences in package thermal performance between the LT11173 in SOT-223 and TO-252 (DPAK), and which is preferable for continuous 1A operation in sealed enclosures?
The SOT-223 has a thermal resistance (junction-to-ambient) of ~65°C/W with proper copper pour, while the DPAK variant achieves ~50°C/W due to exposed pad and better heat spreading. Under 1A load at 3.3V output from a 6V input, power dissipation is 2.7W. In a sealed enclosure with 25°C ambient, the SOT-223 reaches ~199°C—well above safe limits—while the DPAK stays near 150°C. Thus, the DPAK package is strongly preferred for sustained 1A operation where airflow is restricted, despite slightly higher cost and footprint.
Can the LT11173 be paralleled for current sharing in redundant power architectures, and what challenges arise without active balancing?
Paralleling LT11173 regulators without external balancing leads to unequal current distribution due to manufacturing tolerances in reference voltages and pass transistors. One regulator may carry >70% of total load while others remain underutilized. To achieve fair sharing, external diodes or resistors in series with each output can force current balancing, but this defeats redundancy benefits. Alternatively, a master-slave configuration with cross-coupling is complex and rarely justified. Therefore, paralleling is generally discouraged unless system architecture inherently accommodates imbalance.
What diagnostic signals can be derived from the LT11173 to monitor health status in a fault-tolerant avionics subsystem?
The LT11173 provides no dedicated fault flag pin. However, monitoring the FB voltage relative to 1.25V reference allows detection of overvoltage or undervoltage conditions. Adding a window comparator circuit using op-amps can generate a logic signal indicating out-of-tolerance output. Alternatively, sensing input-to-output differential voltage reveals dropout anomalies indicative of overload or thermal shutdown. While not real-time, these indirect methods enable software-based health checks during periodic status polls in avionics systems where simplicity and reliability outweigh diagnostic granularity.

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Customer Reviews

Evaluation: 10 Articles

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

  • Embe***dMotion
    Aug 5, 2026

    Purchased this DSP controller for a motor control application. Stable processing performance and very good response under varying loads.

  • FPGA***dio
    Jul 30, 2026

    This FPGA handled our logic design without any surprises. Configuration completed quickly and timing met the project requirements.

  • Nord***mbedded
    Jul 20, 2026

    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

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Delivery Method

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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
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LT11173

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32D-LT11173

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