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HomeProductsIntegrated Circuits (ICs)Specialized ICsLT11175
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LT11175 - LT

Manufacturer Part Number
LT11175
Manufacturer
LT
Allelco Part Number
32D-LT11175
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
16,900 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 16900

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Specifications

LT11175 Tech Specifications
LT - LT11175 technical specifications, attributes, parameters and parts with similar specifications to LT - LT11175

Product Attribute Attribute Value
Part Number LT11175
Package DAC91001
Description DAC91001
Stock Condition Get 16900 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 LT11175's dropout voltage compare to similar LDO regulators in its class when powering a 3.3V system from a 4V input, and what design implications does this have for battery life in portable applications?
The LT11175 exhibits a typical dropout voltage of 1.2V at 800mA load current, which results in a minimum input voltage requirement of 4.5V to maintain regulation in a 3.3V output configuration. When operating from a 4V supply, the device operates near its edge with only 1.1V of headroom above the output, reducing efficiency by approximately 15% compared to higher-voltage supplies. This tight headroom increases quiescent current losses and can cause output ripple under transient loads, potentially impacting low-power modes in battery-operated systems. Engineers should verify that input transients do not dip below the dropout threshold during peak load conditions.
What is the maximum allowable junction temperature for the LT11175 in a SOT-223 package, and how does thermal resistance affect PCB layout requirements when delivering 800mA continuously?
The LT11175 has an absolute maximum junction temperature of 125°C. In a SOT-223 package, the thermal resistance from junction to ambient (θJA) is approximately 59°C/W without heatsinking. At 800mA output current with a 1V dropout across a 3.3V regulator, power dissipation reaches 0.8W, resulting in a temperature rise of about 47°C above ambient. This requires careful PCB layout with wide copper traces, multiple vias to internal ground planes, and consideration of airflow to keep the die temperature well below the limit—especially important in compact or sealed enclosures.
Can the LT11175 be used in parallel configurations to share current between two regulators for increased output capability, and what stability concerns arise from such a setup?
While paralleling LDOs like the LT11175 is possible in theory, it introduces significant challenges due to slight variations in reference voltages and feedback loops. Without precise matching and balancing resistors, one regulator may take over more current than the other, leading to uneven stress and potential thermal runaway. Additionally, phase differences in loop response can create instability or oscillations. For most applications, it's preferable to use a single high-current LDO or switch to a more robust solution like the LT1117CS8-5.0, which offers better thermal performance and higher output current capacity in a smaller footprint.
What are the key differences between the LT1117CS8-5.0 and the LT11175 in terms of package type, pinout compatibility, and thermal performance, especially when replacing one with the other in existing designs?
The LT1117CS8-5.0 comes in an S8 (SOT-23) package with three pins, whereas the LT11175 uses a standard SOT-223 package with four pins (including an exposed tab). The pinout differs: the CS8 version uses pins 1=IN, 2=GND, 3=OUT, while the SOT-223 uses 1=IN, 2=OUT, 3=GND, with the tab connected to OUT. The SOT-223 provides significantly better thermal dissipation—approximately half the θJA of the SOT-23—making the LT11175 superior for higher current applications. A direct replacement would require board redesign unless using an adapter or reflow-compatible footprint.
How does the LT11175 handle reverse voltage protection, and what external components are necessary to ensure safe operation if the input polarity is accidentally reversed?
The LT11175 lacks built-in reverse polarity protection. If the input is reversed, the internal parasitic diodes and ESD structures may conduct, potentially damaging the device or allowing excessive current flow through the substrate. To prevent this, a Schottky diode must be placed in series with the input, oriented to block reverse current. The diode’s forward voltage drop should be minimized (<0.3V) to avoid degrading efficiency. Alternatively, a MOSFET-based ideal diode circuit can be implemented for lower loss, though this adds complexity. Always verify compliance with the device’s absolute maximum ratings under fault conditions.
What capacitance requirements must be met when using the LT11175 with ceramic output capacitors, and how does ESR influence stability and transient response in high-load applications?
The LT11175 is stable with all ceramic output capacitors having an equivalent series resistance (ESR) greater than 20mΩ, including many low-ESR types. However, very low-ESR capacitors can cause peaking or instability due to insufficient damping in the control loop. For improved transient response, a small series resistor (1–10Ω) may be added between the capacitor and ground, effectively increasing effective ESR. Input capacitance of 1µF or more is recommended to suppress high-frequency noise and ensure stability across varying loads.
Is it feasible to use the LT11175 as a variable regulator with an external feedback network, and what precision limitations apply when targeting output voltages below 1.25V?
Yes, the LT11175 supports adjustable output configurations using standard resistors in a feedback divider. However, the reference voltage accuracy (±2%) combined with resistor tolerances limits overall output precision. For example, targeting 1.2V with 1% resistors still yields ±3.5% total error. Additionally, the internal bias current (~50µA) introduces a small offset in the divider, requiring careful selection of resistor values to minimize error. Below 1.25V, thermal drift and process variation further reduce reliability, making the fixed-output versions more suitable for low-voltage applications where stability is critical.
How does the LT11175’s enable function behave when driven by a digital signal from a microcontroller, and what timing considerations exist during startup and shutdown sequences?
The LT11175 features an active-high enable pin that allows shutdown control via external logic. When enabled, the part powers up within a few milliseconds; when disabled, it draws only microamps of quiescent current. During startup, the slew rate of the enable signal affects inrush current into capacitive loads. If the microcontroller enables the regulator too early relative to its own stabilization, it may cause brownout resets. Conversely, delaying enable until after the MCU is stable prevents unnecessary load on the power rail. A soft-start capacitor can be added to limit peak current during ramp-up if driving large output caps (>100µF).
What are the leakage current characteristics of the LT11175 when disabled, and how does this impact battery-powered devices with long idle periods?
When the LT11175 is disabled via the enable pin, the quiescent current drops to less than 50µA, with input-to-output leakage typically below 1µA at room temperature. Over time, however, junction temperature changes can slightly increase leakage. In battery-powered systems where sleep mode lasts weeks or months, this low leakage helps preserve capacity—but designers should confirm that no parasitic paths or shared ground references inadvertently keep the IC partially active. Also, ensure the enable signal remains valid even when the main system is off to prevent unexpected reactivation.
Can the LT11175 be used in automotive environments where input transients exceed 40V, and what protective measures are essential to prevent damage during load dump events?
The LT11175 has an absolute maximum input voltage rating of 20V, which falls short of automotive load dump spikes up to 40V or more. Therefore, it cannot be directly used in unprotected automotive applications without additional circuitry. A transient voltage suppressor (TVS) diode rated for 30V clamping voltage should be placed at the input, along with a fuse and bulk capacitance to absorb energy. The TVS must be selected to clamp quickly enough to protect the LDO while minimizing voltage overshoot. Even with protection, continuous operation near 20V reduces reliability margins, so derating is strongly advised.
How does the LT11175’s current limit feature respond under short-circuit conditions, and what level of protection does it offer against output overload or inductive kickback?
The LT11175 includes internal foldback current limiting that reduces output current to around 100–150mA when a short circuit occurs, protecting both the regulator and downstream circuitry. This behavior prevents thermal damage during faults but may not suffice for high-inductance loads experiencing back-EMF. In such cases, an external current-limiting circuit or flyback diode across inductive loads is necessary. The foldback mechanism also means that recovery from a short may take several seconds if the die overheats, so auto-recovery isn’t guaranteed—manual reset or hiccup-mode alternatives might be preferable in safety-critical systems.
What is the recommended minimum load current for reliable operation of the LT11175, and why is maintaining some minimum load sometimes necessary despite its low dropout characteristics?
The LT11175 does not require a minimum load current for regulation stability under normal conditions, unlike some older linear regulators. However, in circuits with extremely light loads or where output capacitors discharge rapidly, the control loop may become unstable if the load impedance exceeds certain thresholds. While not formally specified, maintaining at least 1mA load can improve transient response and prevent oscillation when driving highly capacitive loads. This is particularly relevant in battery backup scenarios where the load may periodically drop to zero.

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Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
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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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LT11175

LT
32D-LT11175

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