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HomeProductsIntegrated Circuits (ICs)Specialized ICsLT1117CM
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LT1117CM - LT

Manufacturer Part Number
LT1117CM
Manufacturer
LT
Allelco Part Number
32D-LT1117CM
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
10,310 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 10310

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Specifications

LT1117CM Tech Specifications
LT - LT1117CM technical specifications, attributes, parameters and parts with similar specifications to LT - LT1117CM

Product Attribute Attribute Value
Part Number LT1117CM
Package DAC91001
Description DAC91001
Stock Condition Get 10310 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 LT1117CM's dropout voltage of 1.2 V at 800 mA affect thermal design in a 5 V to 3.3 V conversion for a battery-powered device?
With an input of 5 V and output of 3.3 V, the LT1117CM requires a minimum dropout voltage of approximately 1.7 V under load, which exceeds the available headroom. At 800 mA output current, the dropout voltage rises significantly above 1.2 V, necessitating either a higher input voltage or careful thermal management if operated near its limit. This makes the LT1117CM unsuitable for direct 5 V-to-3.3 V conversion without risking regulation failure or excessive power dissipation. Engineers should verify that the input-to-output differential remains sufficient across all operating conditions.
In what scenarios would the LT1117CM’s maximum junction temperature of 125°C become a limiting factor during continuous operation?
The LT1117CM’s absolute maximum junction temperature of 125°C constrains operation in compact designs with poor heat dissipation. For example, in a tightly packaged system converting 4.2 V to 3.3 V at 600 mA, power dissipation reaches 540 mW. If the thermal resistance from junction to ambient is high—such as in a sealed enclosure—the junction could exceed 125°C even at moderate ambient temperatures, leading to thermal shutdown or reliability issues. Proper PCB layout and thermal vias are essential to maintain safe operating temperatures.
What input capacitance requirements must be met when using the LT1117CM to ensure stability, and how does this impact board layout?
The LT1117CM requires a minimum input capacitance of 33 µF to maintain stability, preferably using low-ESR tantalum or ceramic capacitors. Insufficient capacitance can result in oscillations or transient response degradation, especially under dynamic load conditions. This requirement forces engineers to allocate space for a larger capacitor near the input pin, influencing component placement and potentially increasing BOM cost. Using non-compliant capacitors risks instability in feedback networks and compromises overall regulator performance.
How does the LT1117CM compare to the LM1117-3.3 in terms of efficiency and dropout voltage when converting 5 V to 3.3 V at 500 mA?
While both regulators target 3.3 V output, the LT1117CM typically exhibits a slightly lower dropout voltage (around 1.2 V vs. 1.3–1.4 V) at 800 mA compared to the LM1117-3.3, offering marginally better efficiency in tight headroom applications. However, the LT1117CM’s fixed output version lacks adjustable variants, limiting flexibility. In a 5 V-to-3.3 V conversion at 500 mA, the LT1117CM achieves higher efficiency due to reduced power loss across the pass element, making it preferable where small gains in runtime matter.
Can the LT1117CM be used in parallel to increase current capacity, and what precautions are necessary to avoid imbalance?
Yes, the LT1117CM can operate in parallel to share current loads, but only with external diodes and resistors for current sharing. Without balancing components, one regulator may carry most of the load due to slight mismatches in output voltages or quiescent currents. Adding Schottky diodes between outputs and a common node, along with ballast resistors, helps equalize current distribution. This configuration increases total output current capability but adds complexity and minor losses, so it's only justified in high-current applications beyond single-unit limits.
What is the significance of the LT1117CM’s quiescent current of 5 mA when designing for ultra-low-power systems?
The LT1117CM draws 5 mA of quiescent current, which contributes directly to system power consumption in always-on applications. In battery-operated devices running on coin cells or small Li-ion packs, this current can dominate standby drain over time. For instance, in a 3.3 V system with a 100 mAh battery, 5 mA quiescent current reduces operational life by roughly 20 hours even with zero load—highlighting the need to pair this regulator with sleep modes or consider LDO alternatives with sub-mA quiescent draw.
How does the LT1117CM’s thermal resistance (θJA) of 140°C/W impact its performance in a compact SOT-23 package without a heatsink?
With a θJA of 140°C/W, the LT1117CM generates significant temperature rise per watt of power dissipated. At 4.2 V input, 3.3 V output, and 400 mA load, power dissipation is 360 mW, resulting in a junction-to-ambient temperature rise of about 50.4°C. In a 25°C environment, this pushes the junction to nearly 75°C—well within limits—but approaching critical thresholds in hot environments or sealed enclosures. Without additional cooling, prolonged operation near full load risks thermal throttling or accelerated aging.
What are the key differences between the LT1117CM and adjustable versions like the LT1117CS8#PBF in terms of flexibility and typical use cases?
The LT1117CM is a fixed 3.3 V output variant, while the LT1117CS8#PBF is an adjustable model that uses a resistor divider to set any output voltage from 1.23 V upward. This makes the adjustable version suitable for diverse power rails without changing part numbers, reducing inventory overhead. However, the fixed LT1117CM offers simpler implementation and potentially better noise performance due to internal reference optimization. Choice depends on whether standardized voltage levels suffice or system-wide adjustability is required.
Is the LT1117CM suitable for automotive applications, and what environmental ratings must be verified?
The LT1117CM does not have an official AEC-Q100 qualification, so its reliability in automotive environments cannot be guaranteed. While it may function in non-critical automotive circuits, designers should consult manufacturer errata and perform accelerated testing under thermal cycling and vibration to assess suitability. For safety-related systems or extended temperature ranges (-40°C to +125°C), certified automotive-grade alternatives like the LT1117-3.3AQ should be prioritized.
What happens if the LT1117CM is driven with reverse polarity on the input, and how can this be mitigated?
Applying reverse polarity to the LT1117CM’s input can damage the internal protection circuitry or cause unintended conduction through parasitic paths, potentially leading to latch-up or catastrophic failure. To prevent this, include a Schottky diode in series with the input or use a dedicated reverse-polarity protection IC. This safeguard is especially important in field-replaceable modules or user-accessible equipment where accidental miswiring is likely.
How does the LT1117CM’s enable functionality support system-level power sequencing in microcontroller-based designs?
The LT1117CM includes an active-high enable pin that allows precise control over when the regulator turns on. This enables integration into power sequencing logic, ensuring downstream components receive stable 3.3 V before core processors boot. By connecting the EN pin to a GPIO via a pull-down resistor and delay circuit, engineers can delay startup until other rails stabilize, preventing brownout resets or inrush current surges—critical in mixed-signal systems.
What minimum load current is recommended to maintain regulation stability with the LT1117CM in low-power modes?
The LT1117CM does not require a minimum load current for basic regulation, unlike some older linear regulators. However, in applications with intermittent loads (e.g., sensor nodes waking periodically), maintaining a small dummy load (typically 1–5 mA) ensures the error amplifier operates in its linear region and avoids droop during transients. Without such a load, output voltage may drift under very light or zero-load conditions, particularly after long idle periods.
In what way does the LT1117CM’s output noise performance compare to switching regulators in RF-sensitive environments?
The LT1117CM provides clean, low-noise 3.3 V output ideal for analog and RF circuits due to its inherent linearity and absence of high-frequency ripple. Unlike switching regulators, it doesn’t generate conducted EMI that couples onto nearby traces, preserving signal integrity in sensitive receivers or precision ADCs. However, its fixed topology limits efficiency at higher currents, so trade-offs exist between noise immunity and power budget in mixed-signal designs.
Can the LT1117CM be used with lithium-polymer batteries that discharge below 3.5 V, and what risks arise?
The LT1117CM requires a minimum input voltage close to its dropout level (about 3.5 V at full load), so it can operate with partially depleted Li-Po cells down to 3.5 V. However, as the battery voltage approaches this threshold, efficiency drops sharply and thermal stress increases due to higher pass transistor conduction. Additionally, deep discharges below 3.0 V may compromise battery longevity regardless of regulator health, requiring undervoltage lockout circuits to protect both power source and load.
What role does the LT1117CM’s short-circuit protected output play in ruggedized or industrial applications?
The LT1117CM features built-in short-circuit and thermal overload protection, allowing it to survive temporary output shorts without damage. In industrial settings where wiring errors or inductive kickback occur frequently, this robustness reduces downtime and replacement costs. Combined with foldback current limiting, the regulator safely reduces current during faults rather than shutting down abruptly, enabling faster recovery once the fault clears—ideal for harsh environments.

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Customer Reviews

Evaluation: 10 Articles

  • 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.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
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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.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
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QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
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We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
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  • ISO 28000: 2007
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LT1117CM

LT
32D-LT1117CM

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