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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearLP38690DTX-5.0
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LP38690DTX-5.0 - Texas Instruments

Manufacturer Part Number
LP38690DTX-5.0
Manufacturer
Texas Instruments
Allelco Part Number
32D-LP38690DTX-5.0
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
6,480 pcs available, New & Original
Parts Description
IC REG LINEAR 5V 1A TO252-3
Package
TO-252-3
Data sheet
LP38690DTX-5.0.pdf
RoHs Status
 
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Specifications

LP38690DTX-5.0 Tech Specifications
Texas Instruments - LP38690DTX-5.0 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LP38690DTX-5.0

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage Dropout (Max) 0.8V @ 1A
Voltage - Output (Min/Fixed) 5V
Voltage - Output (Max) -
Voltage - Input (Max) 10V
Supplier Device Package TO-252-3
Series -
Protection Features Over Temperature
Package / Case TO-252-3, DPak (2 Leads + Tab), SC-63
Package Tape & Reel (TR)
PSRR 55dB (120Hz)
Product Attribute Attribute Value
Output Type Fixed
Output Configuration Positive
Operating Temperature -40°C ~ 125°C
Number of Regulators 1
Mounting Type Surface Mount
Current - Supply (Max) 100 µA
Current - Quiescent (Iq) 55 µA
Current - Output 1A
Control Features -
Base Product Number LP38690

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

LP38690DTX-5.0 Image
LP38690DTX-5.0 (1)

Manufacturer Part Number

LP38690DTX-5.0

Manufacturer

Texas Instruments

Introduction

Linear Low Dropout Regulator for Power Management Applications

Product Features and Performance

Fixed 5V Output Voltage

1A Output Current Capability

Low Dropout Voltage of 0.8V at 1A Load

Low Quiescent Current of 55 µA

High PSRR of 55dB at 120Hz

Product Advantages

Efficient Low-Dropout Performance

Minimal Quiescent Current for Power Saving

Stable with Small Ceramic Output Capacitors

High Ripple Rejection Ratio

Key Technical Parameters

Input Voltage up to 10V

Output Voltage 5V Min/Fixed

Dropout Voltage 0.8V Max at 1A Load

Output Current of 1A

Quiescent Current 55 µA

Supply Current 100 µA Max

PSRR 55dB at 120Hz

Quality and Safety Features

Over Temperature Protection

Compatibility

Surface Mount TO-252-3 Package

Compatible with Various Circuit Designs

Application Areas

Consumer Electronics

Industrial Power Supplies

Portable Devices

Product Lifecycle

Obsolete Status

Potential for Replacement or Upgrade Options

Several Key Reasons to Choose This Product

Optimized for Low Voltage Applications

Suitable for Battery-Powered Circuits

High Efficiency for Prolonged Battery Life

Robust Thermal Performance for Safety and Reliability

Simple Integration into Various Designs

Frequently Asked Questions(FAQ)

What are the key design considerations when using the LP38690DTX-5.0 in a battery-powered system with input voltages near the dropout threshold?
The LP38690DTX-5.0 has a maximum dropout voltage of 0.8V at 1A load, meaning the input must remain above 5.8V to maintain regulation. In battery-powered applications, such as those using Li-ion or multi-cell NiMH packs, input voltage decay over discharge cycles can push the supply below this threshold, leading to output droop. Designers should account for worst-case line and load conditions, including transient load steps that momentarily increase dropout. A margin of at least 1V above the dropout voltage is advisable to ensure stable 5V output under dynamic loads, especially when the input source impedance is non-negligible.
How does the quiescent current of the LP38690DTX-5.0 impact efficiency in low-load or standby modes compared to switching regulators?
With a quiescent current of 55 µA, the LP38690DTX-5.0 draws minimal supply current when lightly loaded, making it suitable for always-on systems where efficiency at microamp-level loads matters. However, unlike switching regulators that maintain high efficiency across wide load ranges, this linear regulator dissipates power as heat proportional to (Vin – Vout) × Iload. At 10V input and 10mA load, for example, efficiency drops to approximately 50%, whereas a buck converter might achieve >85%. Thus, the LP38690DTX-5.0 is best applied where noise sensitivity outweighs efficiency concerns, such as analog sensor front-ends or RF modules.
Can the LP38690DTX-5.0 safely handle input transients above 10V during hot-plug or inductive switching events?
The absolute maximum input voltage for the LP38690DTX-5.0 is 10V, and sustained or repetitive transients exceeding this can degrade or destroy the device. In environments with inductive loads or hot-plug scenarios—such as automotive or industrial control systems—an input clamp (e.g., TVS diode) or pre-regulator stage is recommended. Even brief spikes above 10V may compromise long-term reliability, particularly if the junction temperature is already elevated due to power dissipation.
What thermal management strategies are necessary when operating the LP38690DTX-5.0 at full 1A load in a TO-252-3 package?
The TO-252-3 (DPAK) package has a junction-to-ambient thermal resistance (θJA) typically around 50–60°C/W without a heatsink. At 1A load with a 10V input, power dissipation reaches 5W (5V drop × 1A), resulting in a junction temperature rise of 250–300°C above ambient—far exceeding the 125°C maximum. In practice, this necessitates either a significantly lower input voltage, reduced load current, or a copper pour with multiple thermal vias to a ground plane acting as a heatsink. For continuous 1A operation, input voltage should be minimized (e.g., 6–7V) to keep Pd under 2W, enabling safe operation within thermal limits.
How does the PSRR of the LP38690DTX-5.0 at 120Hz influence noise performance in sensitive analog circuits?
The LP38690DTX-5.0 provides 55dB of power supply rejection at 120Hz, meaning it attenuates input ripple by a factor of approximately 560:1 at that frequency. For a 100mVpp ripple on the input, the output would see roughly 180µVpp residual noise. This level is generally sufficient for moderate-precision analog systems like ADCs or op-amp rails, but may be inadequate for high-resolution (>16-bit) data acquisition without additional filtering. Designers should also note that PSRR degrades at higher frequencies, so high-frequency noise from switching sources may require post-regulation LC or RC filtering.
Is the LP38690DTX-5.0 suitable for use in automotive applications given its operating temperature range and package type?
The LP38690DTX-5.0 supports an operating temperature range of –40°C to 125°C, aligning with many automotive under-hood requirements. However, the TO-252-3 package, while surface-mount compatible, may require careful PCB layout to meet mechanical vibration standards. Additionally, the absence of AEC-Q100 qualification means it is not formally rated for automotive use, so deployment in safety-critical systems should be avoided unless supplemented with system-level derating and validation. For non-critical modules like infotainment peripherals, it can be viable with proper thermal and input protection design.
How does the LP38690DTX-5.0 compare to the BA50BC0FP-E2 in terms of dropout voltage and quiescent current for low-headroom applications?
The LP38690DTX-5.0 offers a lower dropout voltage (0.8V max at 1A) compared to the BA50BC0FP-E2, which typically requires 1.2V dropout under similar conditions. This makes the LP38690DTX-5.0 better suited for systems where input voltage is close to 5V, such as 6V nominal supplies. Additionally, the LP38690DTX-5.0 consumes only 55 µA quiescent current versus approximately 500 µA for the BA50BC0FP-E2, giving it a clear advantage in battery-operated devices where standby current is critical.
What protection features does the LP38690DTX-5.0 include, and how do they respond to sustained overload conditions?
The LP38690DTX-5.0 integrates over-temperature protection that shuts down the output when the junction temperature exceeds a safe threshold, typically around 150–160°C. This prevents thermal runaway during short circuits or excessive power dissipation. However, it lacks current limiting or short-circuit protection, meaning prolonged overloads can cause repeated thermal cycling, potentially reducing long-term reliability. Designers should implement external current limiting or ensure adequate thermal design to avoid frequent triggering of the thermal shutdown.
Can the LP38690DTX-5.0 be used in parallel with another regulator to increase output current beyond 1A?
Parallel operation of the LP38690DTX-5.0 is not recommended due to the absence of current-sharing mechanisms or remote sensing. Small variations in output voltage between devices—even from the same batch—can cause one regulator to carry disproportionate load current, leading to thermal imbalance and possible failure. If higher current is required, a single higher-current regulator or a switching pre-regulator followed by the LP38690DTX-5.0 for noise cleaning is a more reliable approach.
What input and output capacitance values are necessary to ensure stability with the LP38690DTX-5.0, and how do ESR requirements affect capacitor selection?
While the LP38690DTX-5.0 is internally compensated and stable with ceramic capacitors, a minimum of 10µF low-ESR ceramic capacitance on the output is recommended for transient response and stability. Input capacitance should be at least 10µF to mitigate supply impedance and reduce input ripple. The device does not require high-ESR capacitors, so modern ceramic types (X5R or X7R) are ideal. However, avoid using only ultra-low capacitance (<1µF) or high-ESR electrolytics without verification, as they may introduce instability under fast load transients.
How does the LP38690DTX-5.0 perform under line transient conditions, such as those defined in IEC 61000-4-5, without external filtering?
The LP38690DTX-5.0 lacks built-in surge protection and is not designed to withstand IEC 61000-4-5 level transients (e.g., ±1kV surge) without external components. Direct exposure to such events can damage the internal circuitry. For applications in industrial or outdoor environments, a combination of input filtering (LC network), transient voltage suppressors, and fuse protection is essential to safeguard the device and maintain output integrity during line disturbances.
What are the implications of the LP38690DTX-5.0 being RoHS non-compliant for modern product development?
The LP38690DTX-5.0 is marked as RoHS non-compliant, meaning it contains restricted substances such as lead in levels exceeding current EU directives. This limits its use in consumer electronics or products requiring full RoHS compliance. Designers targeting global markets must either select an alternative like the LP38690DTX-5.0/NOPB (which is RoHS-compliant) or apply for exemptions under specific categories. For military, aerospace, or legacy industrial systems where RoHS is not mandated, the device remains viable.
How does the moisture sensitivity level (MSL 1) of the LP38690DTX-5.0 affect handling and storage procedures?
With an MSL of 1 (unlimited floor life), the LP38690DTX-5.0 can be exposed to ambient conditions indefinitely without risk of moisture-induced damage during reflow. This simplifies logistics and reduces handling constraints compared to higher MSL-rated devices that require dry packing and strict bake-before-use protocols. As a result, it is well-suited for prototyping, low-volume production, and environments where controlled storage is impractical.
In a multi-rail system, can the LP38690DTX-5.0 be used to post-regulate a switching converter’s output to improve noise performance?
Yes, the LP38690DTX-5.0 is well-suited for post-regulation of a switching converter, especially when clean 5V power is needed for noise-sensitive circuitry. Placed after a buck converter (e.g., 12V to 6V), it can suppress residual switching ripple and provide a stable, low-noise 5V rail. The 55dB PSRR at 120Hz helps attenuate low-frequency ripple, while the linear regulation eliminates high-frequency switching artifacts. This hybrid approach balances efficiency and noise performance effectively.
What layout practices are critical when placing the LP38690DTX-5.0 on a PCB to minimize noise and ensure thermal performance?
The tab of the LP38690DTX-5.0 is electrically connected to Vout and must be thermally bonded to a copper pour acting as a heatsink. Use multiple thermal vias (≥4) under the tab to transfer heat to an internal or bottom-layer ground plane. Keep input and output traces short and wide to reduce parasitic inductance and resistance. Place input and output capacitors as close as possible to the respective pins, with ground returns routed directly to a solid ground plane to minimize loop area and EMI susceptibility.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LP38690DTX-5.0

Product Attribute LP38690DT-5.0 LP38690DTX-2.5 LP38690DTX-1.8 LP38690DTX-3.3
Part Number LP38690DT-5.0 LP38690DTX-2.5 LP38690DTX-1.8 LP38690DTX-3.3
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Protection Features - - - -
Current - Output - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Output Type - Current - Unbuffered Voltage - Buffered -
Number of Regulators - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Current - Supply (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Output (Min/Fixed) - - - -
Output Configuration - - - -
PSRR - - - -
Current - Quiescent (Iq) - - - -
Voltage - Input (Max) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Base Product Number - DAC34H84 MAX500 ADS62P42
Voltage Dropout (Max) - - - -
Control Features - - - -
Series - - - -
Voltage - Output (Max) - - - -

LP38690DTX-5.0 Datasheet PDF

Download LP38690DTX-5.0 pdf datasheets and Texas Instruments documentation for LP38690DTX-5.0 - Texas Instruments.

Datasheets
LP38690, LP38692 Datasheet.pdf

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Customer Reviews

Evaluation: 10 Articles

  • 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.

  • 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.

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LP38690DTX-5.0 Image

LP38690DTX-5.0

Texas Instruments
32D-LP38690DTX-5.0

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