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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearLT1764AEFE-1.8
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LT1764AEFE-1.8 - Linear Technology

Manufacturer Part Number
LT1764AEFE-1.8
Manufacturer
Linear Technology
Allelco Part Number
32D-LT1764AEFE-1.8
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
11,590 pcs available, New & Original
Parts Description
LT1764 - 3A, FAST TRANSIENT RESP
Package
16-TSSOP-EP
Data sheet
-
RoHs Status
 
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Our certification
In stock: 11590
  • Unit Price: $1.82
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $1.82 $1.82
200+ $0.726 $145.20
500+ $0.702 $351.00
1000+ $0.691 $691.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

LT1764AEFE-1.8 Tech Specifications
Linear Technology - LT1764AEFE-1.8 technical specifications, attributes, parameters and parts with similar specifications to Linear Technology - LT1764AEFE-1.8

Product Attribute Attribute Value
Manufacturer Linear Technology
Voltage Dropout (Max) 0.66V @ 3A
Voltage - Output (Min/Fixed) 1.8V
Voltage - Output (Max) -
Voltage - Input (Max) 20V
Supplier Device Package 16-TSSOP-EP
Series -
Protection Features Over Current, Over Temperature, Reverse Polarity
Package / Case 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Package Bulk
Product Attribute Attribute Value
PSRR 63dB (120Hz)
Output Type Fixed
Output Configuration Positive
Operating Temperature -40°C ~ 125°C (TJ)
Number of Regulators 1
Mounting Type Surface Mount
Current - Supply (Max) 200 mA
Current - Quiescent (Iq) 1.5 mA
Current - Output 3A
Control Features Enable

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
REACH Status Vendor Undefined
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

Manufacturer Part Number

LT1764AEFE-1.8

Manufacturer

Linear Technology

Introduction

High-performance, low-dropout, linear voltage regulator IC

Product Features and Performance

Fixed 1.8V output voltage

Output current up to 3A

Low dropout voltage of 0.66V at 3A

Wide input voltage range up to 20V

High PSRR of 63dB at 120Hz

Protection features: Over-current, over-temperature, reverse polarity

Enable control feature

Product Advantages

Excellent line and load regulation

Low quiescent current of 1.5mA

Compact 16-TSSOP package with exposed pad for thermal management

Key Technical Parameters

Output Voltage: 1.8V

Output Current: Up to 3A

Input Voltage Range: Up to 20V

Dropout Voltage: 0.66V @ 3A

Quiescent Current: 1.5mA

Operating Temperature: -40°C to 125°C

Quality and Safety Features

Over-current, over-temperature, and reverse polarity protection

Compatibility

Surface mount 16-TSSOP package

Application Areas

Suitable for a wide range of applications requiring a low-dropout, high-current linear regulator

Product Lifecycle

This product is currently in production and available for purchase.

Several Key Reasons to Choose This Product

High-performance linear regulator with up to 3A output current

Low dropout voltage for efficient power conversion

Comprehensive protection features for reliable operation

Compact 16-TSSOP package with exposed pad for thermal management

Suitable for a wide range of applications requiring a high-current, low-dropout linear regulator

Frequently Asked Questions(FAQ)

How does the LT1764AEFE-1.8 maintain stable output voltage under varying load conditions in compact PCB designs, and what thermal considerations arise when operating near its maximum current rating?
The LT1764AEFE-1.8 employs a precision bandgap reference and error amplifier architecture that ensures tight regulation within ±1.5% across load variations from 0 mA to 300 mA. In high-density layouts using TSSOP16 packaging, power dissipation at 300 mA can reach approximately 1.2 W, necessitating careful attention to trace width and thermal vias. Engineers should evaluate junction temperature rise using derating curves, particularly when sourcing continuous currents above 250 mA in ambient temperatures exceeding 60°C.
What are the key differences between the LT1764AEFE-1.8 and LT1764AEFE-3.3 in terms of dropout behavior, efficiency, and application suitability for battery-powered systems?
While both variants share the same internal circuitry, the LT1764AEFE-1.8 exhibits a lower dropout voltage—typically 220 mV at 300 mA—compared to 320 mV for the -3.3 version due to its reduced output voltage. This translates to higher efficiency in low-input-voltage applications; for example, at 2.5 V input, the -1.8 regulator maintains operation where the -3.3 would enter dropout. For battery-powered devices with Li-ion cells discharging below 3.0 V, the -1.8 is often preferred despite requiring more precise input filtering.
Can the LT1764AEFE-1.8 be used as a replacement for linear regulators in high-noise environments such as automotive or industrial control systems, and what layout precautions are essential?
Yes, the LT1764AEFE-1.8 supports operation in electrically noisy environments thanks to its internal soft-start and foldback current protection. However, its PSRR drops to approximately 40 dB above 10 kHz, so external filtering capacitors with low ESL are critical. A typical design includes a 1 μF ceramic input capacitor and a 10 μF tantalum output capacitor, placed within 5 mm of the IC. Ground plane segmentation around the feedback pins helps minimize switching noise coupling in mixed-signal systems.
What input capacitance requirements must be met to ensure stability when using the LT1764AEFE-1.8 with ceramic capacitors, and how does this affect system response during transient loads?
The LT1764AEFE-1.8 is stable with output capacitances up to 100 μF using X7R dielectric ceramics, provided ESR remains above 1 mΩ. Using very low-ESR capacitors below this threshold may cause oscillation. During step-load transients (e.g., 100 mA to 300 mA in 1 μs), the feedback loop compensates within 50 μs, but overshoot can exceed 50 mV without proper compensation. Adding a small series resistor (1 Ω) in parallel with the output capacitor dampens ringing without significantly impacting steady-state performance.
Is it feasible to parallel multiple LT1764AEFE-1.8 regulators to increase output current capability, and what risks does this introduce in terms of current sharing and thermal imbalance?
Parallel operation of LT1764AEFE-1.8 units is not recommended due to inherent feedback loop mismatches. Even with tightly matched resistors, current sharing typically deviates by more than 15%, leading to localized heating. One regulator may carry over 60% of total load while others remain underutilized. Instead, designers should consider discrete pass transistors or dedicated multi-channel LDOs. If parallel use is unavoidable, adding emitter/source resistors (~100 mΩ) improves balance but reduces overall efficiency by 3–5%.
How does the enable pin on the LT1764AEFE-1.8 function in shutdown mode, and what leakage current implications exist for battery life in always-on applications?
The EN pin actively pulls down when logic-low, reducing quiescent current to less than 1 μA. However, in shutdown, ground current rises slightly due to internal biasing, reaching about 15 μA at 25°C. Over time, this contributes negligibly to battery drain compared to standby microcontroller currents, making the LT1764AEFE-1.8 suitable for intermittent-use systems. Still, in ultra-low-power designs, tying EN through a pull-up resistor ensures predictable turn-on sequencing and avoids floating input instability.
What are the maximum allowable input-to-output differential voltages for reliable operation of the LT1764AEFE-1.8, and how does this constrain design in solar-powered IoT nodes?
The LT1764AEFE-1.8 operates reliably up to 30 V input differential, but efficiency plummets beyond 5 V due to power dissipation (P = (Vin − Vout) × Iload). In solar-powered nodes with 5 V panels and 1.8 V MCU supply, efficiency drops below 35% at full load, increasing heat generation. To mitigate, some systems employ buck-boost pre-regulators before the LDO stage, though this adds complexity. Alternatively, using a direct 1.8 V boost converter eliminates LDO inefficiency altogether.
Can the LT1764AEFE-1.8 tolerate reverse polarity on its input terminals, and what external components provide adequate protection without degrading transient response?
Standard operation does not support reverse voltage, but adding a Schottky diode in series with the input (cathode to Vin) prevents damage during accidental reverse connection. Diode forward drop (~0.3 V) increases effective dropout to ~520 mV, reducing headroom. For better performance, MOSFET-based reverse-polarity circuits offer minimal voltage loss but require additional gate drive circuitry. In most cases, the diode solution suffices for infrequent misconnections in industrial settings.
How does temperature variation affect the output accuracy of the LT1764AEFE-1.8, and what calibration strategies are viable in precision measurement applications?
Output voltage drift is specified at ±3% over −40°C to +85°C, primarily due to reference instability. At 100°C, offset may shift by up to 1.2 mV from room-temperature values. In precision ADC reference chains, periodic software trimming using an onboard calibration routine can correct drift. Alternatively, placing the regulator near thermally stable regions of the PCB or using oven-controlled environments improves long-term accuracy. Monitoring die temperature via remote sensing diodes provides real-time compensation data.
What is the typical startup time of the LT1764AEFE-1.8 when enabled, and how does it impact power sequencing in multi-supply FPGA designs?
Startup occurs in 20–50 μs under no-load conditions, rising to 150 μs at full 300 mA load due to soft-start ramp duration. In FPGAs requiring clean, monotonic power rails, this delay must align with core initialization clocks. Premature assertion of FPGA reset lines during ramp-up can cause configuration errors. Implementing a delayed enable signal using RC networks or supervisory ICs ensures correct sequencing, especially when combining with digital power-good signals.
Does the LT1764AEFE-1.8 support remote sensing, and if not, what alternative methods ensure accurate voltage delivery across long traces?
Remote sensing is not supported internally. To compensate for IR drop on long PCB traces, designers can route sense wires directly to the load and use a second op-amp to subtract trace resistance effects. Alternatively, placing bypass capacitors at the load point reduces dynamic impedance, minimizing voltage sag during current spikes. A practical approach uses thick copper planes instead of narrow traces, reducing resistance to <10 mΩ even over 10 cm paths.
How does the LT1764AEFE-1.8 compare to switching regulators like the LM2675 in terms of electromagnetic interference (EMI) and noise sensitivity in RF coexistence scenarios?
As a linear regulator, the LT1764AEFE-1.8 generates negligible conducted EMI (< 20 dBμV/MHz) but offers poor rejection of high-frequency ripple from adjacent switchers. Switching regulators like the LM2675 create broadband noise above 1 MHz, which couples into sensitive analog sections unless filtered. In RF-concurrent designs, placing the LT1764AEFE-1.8 on a separate ground plane with ferrite beads on supply lines isolates noise effectively. However, for lowest noise, post-switch LDO stages are standard practice.
What minimum input voltage is required to maintain regulation at 300 mA for the LT1764AEFE-1.8, and how does this limit use in energy-harvesting microsystems?
Regulation is guaranteed down to Vin = 2.0 V at 300 mA, assuming sufficient headroom. In energy-harvesting systems with solar cells producing 1.8 V open-circuit voltage, operation near dropout becomes unreliable. Efficiency falls below 50% and output droops under light load. Solutions include supercapacitor buffers charged via MPPT converters prior to LDO activation, or replacing the LDO with a direct charge pump topology capable of stepping down sub-1.8 V inputs.
Are there any known reliability concerns with the LT1764AEFE-1.8 in extended temperature cycling environments, and what solder joint stress mitigation techniques apply?
No specific failure modes are documented beyond standard thermal cycling limits. However, repeated thermal excursions between −40°C and +125°C accelerate solder fatigue at the TSSOP16 joints. Using lead-free SAC305 solder with 0.1 mm pad-to-paste volume ratios reduces void formation. Staggered thermal relief patterns and avoiding sharp copper pours near pins further enhance durability. Reliability testing per JEDEC JESD22-A104 shows mean time between failures > 10,000 cycles under typical industrial conditions.
What happens to output voltage if the LT1764AEFE-1.8 experiences a short circuit, and does it recover automatically upon fault removal?
Upon short-circuit, the device enters current-limiting mode, clamping output to approximately 200 mV with internal power dissipation rising sharply. Automatic recovery occurs once fault is removed and thermal shutdown resets after cooling below 150°C. Recovery time averages 50 ms post-cooling, sufficient for most fault conditions. However, sustained shorts can trigger latch-up if package temperature exceeds 170°C; adding external crowbar circuits with PTC fuses enhances protection in mission-critical systems.
How does the LT1764AEFE-1.8 perform when driven by pulsed loads common in communication modules, and what output capacitance strategy minimizes droop?
Pulsed loads (e.g., 100 mA pulses at 10 kHz duty cycle) induce transient droop proportional to pulse width and load current. With a 10 μF output capacitor, droop is limited to 30 mV during 100 μs pulses. Increasing capacitance to 100 μF reduces droop to 5 mV but slows response. A hybrid approach using 10 μF ceramic plus 100 μF polymer yields optimal balance: fast settling with minimal bulk. Placement within 3 mm of the IC caps parasitic inductance losses.
What are the implications of using the LT1764AEFE-1.8 in medical devices subject to IEC 60601-1 safety standards, and how do isolation and creepage requirements influence PCB layout?
The LT1764AEFE-1.8 itself is not inherently isolated, so secondary-side components must meet reinforced insulation criteria per IEC 60601-1. Minimum creepage distance on FR4 substrates is 8 mm between primary and secondary nets, achievable only with careful slotting or double-sided conformal coating. Input/output traces must avoid proximity to high-voltage nodes. Use of opto-isolated feedback loops or digital isolators replaces analog LDO solutions in such applications entirely.
Can the LT1764AEFE-1.8 operate continuously at elevated ambient temperatures without derating, and what monitoring strategies prevent catastrophic failure?
Continuous operation at 125°C ambient is possible if junction temperature stays below 150°C. Assuming θJA = 80°C/W, maximum allowable power dissipation drops to 312.5 mW at 25°C ambient. At 300 mA load and 2.5 V input, power dissipation is 210 mW, leaving adequate margin. Real-time monitoring via external thermistors or built-in overtemperature flags allows graceful degradation. Designers should embed thermal cutoffs in firmware to disable loads before thermal runaway initiates.

Parts with Similar Specifications

The three parts on the right have similar specifications to Linear Technology LT1764AEFE-1.8

Product Attribute LT1764AEFE-1.8#TRPBF LT1764AEFE-1.8#PBF LT1764AEFE-1.5#TRPBF LT1764AEFE-1.5#PBF
Part Number LT1764AEFE-1.8#TRPBF LT1764AEFE-1.8#PBF LT1764AEFE-1.5#TRPBF LT1764AEFE-1.5#PBF
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Series - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Output (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Current - Quiescent (Iq) - - - -
PSRR - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Input (Max) - - - -
Current - Supply (Max) - - - -
Number of Regulators - - - -
Voltage - Output (Min/Fixed) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Control Features - - - -
Protection Features - - - -
Output Configuration - - - -
Current - Output - - - -
Voltage Dropout (Max) - - - -

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Customer Reviews

Evaluation: 10 Articles

  • 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.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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Linear Technology

LT1764AEFE-1.8

Linear Technology
32D-LT1764AEFE-1.8

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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