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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearLP38690DT-5.0
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LP38690DT-5.0 - Texas Instruments

Manufacturer Part Number
LP38690DT-5.0
Manufacturer
Texas Instruments
Allelco Part Number
32D-LP38690DT-5.0
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
26,058 pcs available, New & Original
Parts Description
IC REG LINEAR 5V 1A TO252-3
Package
TO-252-3
Data sheet
LP38690DT-5.0.pdf

PCN Design/Specification

Cylindrical Battery Holders.pdf
RoHs Status
 
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Specifications

LP38690DT-5.0 Tech Specifications
Texas Instruments - LP38690DT-5.0 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LP38690DT-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 Tube
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

LP38690DT-5.0 Image
LP38690DT-5.0 (1)

Manufacturer Part Number

LP38690DT-5.0

Manufacturer

Texas Instruments

Introduction

Low Dropout Voltage Regulator, 5V Fixed Output, 1A

Product Features and Performance

Positive Output Configuration

Fixed Output Type

Single Regulator

10V Maximum Input Voltage

5V Output Voltage

8V Maximum Voltage Dropout at 1A

1A Output Current

55 µA Quiescent Current

100 µA Maximum Supply Current

55dB PSRR at 120Hz

Product Advantages

High power supply rejection ratio

Low quiescent current for power efficiency

Over Temperature Protection for safety

Key Technical Parameters

Voltage - Input (Max): 10V

Voltage - Output (Min/Fixed): 5V

Current - Output: 1A

Current - Quiescent (Iq): 55 µA

PSRR: 55dB (120Hz)

Voltage Dropout (Max): 0.8V @ 1A

Quality and Safety Features

Over Temperature Protection

Compatibility

Compatible with surface mount technology

Package/Case: TO-252-3, DPAK

Application Areas

Power Supplies

Consumer Electronics

Industrial Controls

Product Lifecycle

Not For New Designs

Possible replacements or upgrades should be considered

Several Key Reasons to Choose This Product

Fixed 5V output for stable power supply

Low dropout voltage for efficient operation

Good PSRR for reduced noise in sensitive circuits

Low quiescent current to minimize power waste

Robust over-temperature protection

Suited for a wide range of operating temperatures from -40°C to 125°C

Suitable for high-density mounting with TO-252-3 DPAK package

Produced by reputable manufacturer Texas Instruments

Frequently Asked Questions(FAQ)

How does the LP38690DT-5.0 compare to other fixed-output linear regulators when considering thermal performance at 1A load in a compact TO-252 package?
At 1A output current, the LP38690DT-5.0 exhibits a maximum dropout voltage of 0.8V, meaning it can maintain regulation with an input as low as 5.8V under full load. When operating from a 12V supply delivering 1A, the power dissipation is approximately (12V - 5V) × 1A = 7W. In the TO-252-3 package, this level of dissipation requires careful layout and potentially a heatsink for sustained operation above ambient temperatures. Compared to similar regulators in competing packages like the SOT-223 or DFN, the TO-252's larger exposed tab provides better thermal resistance than smaller surface-mount formats, though not as effective as larger TO-220 variants. This makes the LP38690DT-5.0 a reasonable choice for moderate power applications where space is constrained but some thermal management is feasible.
What are the key limitations of using the LP38690DT-5.0 in battery-powered systems compared to switching regulators?
The LP38690DT-5.0 draws 55 µA of quiescent current in normal operation, which is relatively low for a linear regulator but still significant in ultra-low-power battery applications. When powered directly from a Li-ion cell (3.7V nominal), the dropout of 0.8V means the input must remain above 5.8V to sustain 5V output at 1A—this effectively eliminates its use in standard single-cell Li-ion systems. Even in dual-cell configurations, efficiency remains poor due to the linear nature of the regulation. For example, converting 7.4V to 5V at 1A results in only ~67% efficiency, wasting nearly one-third of the input energy as heat. Switching regulators would achieve 85–95% efficiency in this scenario, making them far superior for battery-powered designs requiring long runtime.
Can the LP38690DT-5.0 be used safely in automotive environments without additional protection circuitry?
While the LP38690DT-5.0 operates over a temperature range of -40°C to 125°C and includes over-temperature protection, it lacks built-in reverse-polarity or load-dump protection required by many automotive standards such as ISO 7637 or ISO 16750. In a vehicle environment with transients up to 40V or inductive loads that can backfeed voltage, this regulator may fail if subjected to reverse polarity or voltage spikes beyond its 10V absolute maximum rating. Designers intending to use the LP38690DT-5.0 in automotive applications should include external TVS diodes, reverse-blocking diodes, and input filtering to meet reliability requirements.
Is the LP38690DT-5.0 suitable for use with microcontrollers that require precise 5V rail stability under transient loads?
The LP38690DT-5.0 offers decent line and load regulation, but its PSRR of 55dB at 120Hz indicates limited rejection of AC ripple on the input line. For microcontroller applications sensitive to voltage fluctuations—such as those with dynamic current demands during flash memory access or USB suspend/resume cycles—the regulator may not provide sufficiently clean power without additional bulk capacitance and possibly LC filtering. While adequate for many digital logic circuits, critical analog peripherals or precision ADC measurements on the same rail could suffer from residual noise. Therefore, while usable, supplemental decoupling and filtering are recommended for robust performance in high-integrity signal chains.
How does the LP38690DT-5.0 perform when stepping down from a noisy DC-DC converter output?
When used post-switching stage to clean up output ripple, the LP38690DT-5.0’s 55dB PSRR at 120Hz implies attenuation of only about a factor of 177 at that frequency. Higher-frequency noise components (e.g., from switching at 2MHz) see even less rejection due to declining PSRR with increasing frequency. Consequently, if fed from a buck converter running at high frequency with poor output ripple specification, the linear regulator will pass through significant switching artifacts unless the upstream converter already has tight output filtering. Thus, placing the LP38690DT-5.0 after a well-designed low-ripple DC-DC converter yields better results than attempting to clean a poorly filtered source.
What layout considerations are essential when mounting the LP38690DT-5.0 on a PCB to ensure reliable operation?
Due to its TO-252-3 package and thermal pad design, proper PCB layout is crucial for heat dissipation and electrical performance. The exposed metal tab must be soldered directly to a large copper pour acting as a heatsink, with multiple vias connecting it to internal planes for effective thermal transfer. Input and output capacitors should be placed within 10mm of the IC pins to minimize parasitic inductance, which can degrade transient response and increase EMI. Ground return paths must be short and wide to avoid ground bounce affecting feedback stability. Failure to adhere to these guidelines risks excessive junction temperature rise under continuous load, potentially triggering thermal shutdown or permanent damage.
Why might the LP38690DT-5.0 be preferred over alternatives like the BA50BC0FP-E2 despite similar output voltage?
Both regulators offer 5V fixed output and comparable current capability, but differences emerge in packaging and availability. The LP38690DT-5.0 uses a TO-252-3 package with an integrated thermal pad, facilitating better heat dissipation than the SOT-23-5 package used by the BA50BC0FP-E2. Additionally, the LP38690DT-5.0 typically features lower dropout voltage (0.8V vs. often >1V in similar SOT-23 parts), enabling operation closer to the output threshold. However, the BA50BC0FP-E2 is RoHS-compliant, whereas the LP38690DT-5.0 is listed as RoHS non-compliant—a critical factor in regulated markets. Therefore, selection depends on whether environmental compliance outweighs thermal and electrical performance needs.
What input capacitance requirements apply to the LP38690DT-5.0 to ensure stable operation across varying load conditions?
The datasheet specifies a minimum input capacitance of 0.33µF ceramic capacitor with X7R or X5R dielectric. Without sufficient input capacitance, the regulator may become unstable under light-to-heavy load transitions due to phase margin degradation in the control loop. Using higher-value capacitors (e.g., 1–10µF) improves transient response and reduces input impedance seen by the regulator, but excessively large values can interact with parasitic inductance to create resonant peaks. A typical design practice is to use a 2.2µF ceramic capacitor close to the input pin along with a small series resistor (1–10Ω) if ringing is observed during testing.
Can the LP38690DT-5.0 operate reliably in humidity-prone environments without conformal coating?
With an MSL rating of 1 (unlimited floor life), the LP38690DT-5.0 is highly tolerant to moisture exposure before assembly. However, once mounted, the presence of flux residues or condensation near the leads and thermal pad can lead to electrochemical migration or corrosion over time, especially in industrial or outdoor settings with elevated humidity. While not immediately catastrophic, long-term reliability may be compromised without protective measures such as conformal coating or sealed enclosures. Designers working in harsh environmental conditions should evaluate the need for additional protection layers beyond standard PCB manufacturing tolerances.
How does the LP38690DT-5.0 handle inrush current when connected to capacitive loads exceeding 1000µF?
The LP38690DT-5.0 has no explicit inrush current limitation, so connecting heavy capacitive loads (e.g., 2200µF) directly to the output may cause excessive peak currents during startup. This can stress both the regulator and preceding power source, potentially leading to brownouts or tripping of overcurrent protections. To mitigate this, designers often add a soft-start circuit or limit the initial charging current using an NTC thermistor or external MOSFET controlled by a pre-regulator. Alternatively, ensuring the input source can sustain brief current surges below the absolute maximum ratings helps maintain system stability during turn-on transients.
Is the LP38690DT-5.0 appropriate for driving RF modules that demand clean power supplies?
RF modules typically require very low noise and ripple on their power rails to prevent intermodulation distortion and phase noise degradation. Although the LP38690DT-5.0 is a linear regulator, its internal architecture and lack of advanced filtering make it less ideal than dedicated LDOs with ultra-low noise specifications (<10µVRMS). Moreover, any residual switching noise from upstream stages or conducted emissions through PCB traces can couple onto the 5V rail. For best results, additional post-regulation with a low-noise LDO or extensive filtering networks (LCπ filters) are necessary when driving sensitive RF front-end components from the LP38690DT-5.0.
What trade-offs exist between using the LP38690DT-5.0 versus discrete transistor-based regulators for 5V generation?
Discrete solutions allow customization of bias currents, compensation networks, and protection schemes, offering potential cost savings at low volumes. However, they require more board space, deeper analog design expertise, and longer development time. In contrast, the LP38690DT-5.0 integrates essential functions—thermal shutdown, current limiting (implied by over-temperature), and stable feedback—into a single device with predictable behavior. Its fixed output simplifies design, and proven reference designs reduce risk. For most production applications where reliability, footprint, and time-to-market matter, the integrated approach of the LP38690DT-5.0 outweighs the theoretical flexibility of discrete implementations.
Does the LP38690DT-5.0 support enable/disable functionality via an external control signal?
No, the LP38690DT-5.0 lacks an enable pin; it operates continuously whenever input voltage exceeds dropout. This means it cannot be turned off remotely to save power in sleep modes. If shutdown capability is required, designers must either use a pass transistor controlled by a logic signal or select an alternative regulator with EN pin functionality. Workarounds involving series FETs increase component count and introduce slight voltage drop, making them suboptimal for precision 5V supplies.
What happens to output voltage accuracy if the LP38690DT-5.0 operates near its dropout condition?
Near dropout (input ≈ 5.8V at 1A load), the internal error amplifier struggles to maintain regulation due to reduced headroom. Output voltage can sag by several hundred millivolts under full load, degrading accuracy significantly. For instance, a 5.8V input might result in a measured output closer to 4.9–4.95V depending on load and temperature. This effect is exacerbated by variations in input voltage tolerance (±5% typical) and component aging. Thus, operating near dropout compromises both regulation and reliability, and should be avoided in precision applications.
How does the LP38690DT-5.0 compare to modern low-dropout regulators like the TPS7A4700 for high-current 5V applications?
The TPS7A4700 supports up to 2A with ultra-low dropout (~100mV at 2A) and exceptional PSRR (>60dB beyond 1kHz), making it far superior for high-performance 5V rails. It also includes advanced features such as adjustable output, nanopower shutdown (<1µA IQ), and integrated diagnostics. In contrast, the LP38690DT-5.0 caps out at 1A, has higher dropout, lacks programmability, and consumes more quiescent current (55µA). Unless legacy compatibility or specific package constraints drive selection, newer LDOs like the TPS7A4700 deliver better efficiency, stability, and functionality for demanding designs.
Are there known failure modes associated with the LP38690DT-5.0 in high-temperature applications?
Prolonged operation above 100°C increases the likelihood of accelerated electromigration in bond wires and metallization layers, particularly under high current density. Combined with thermal cycling stresses common in industrial environments, this can lead to early-life failures such as open connections or degraded performance. Additionally, the absence of ESD protection beyond standard handling precautions means improper static discharge during assembly could damage sensitive internal nodes. While the over-temperature protection prevents catastrophic failure, it does not guarantee continued functional operation after threshold activation. Designers should derate current usage in hot zones and follow JEDEC guidelines for thermal stress mitigation.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LP38690DT-5.0

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

LP38690DT-5.0 Datasheet PDF

Download LP38690DT-5.0 pdf datasheets and Texas Instruments documentation for LP38690DT-5.0 - Texas Instruments.

PCN Design/Specification
Cylindrical Battery Holders.pdf

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LP38690DT-5.0 Image

LP38690DT-5.0

Texas Instruments
32D-LP38690DT-5.0

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