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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsLM5009ASD
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LM5009ASD - Texas Instruments

Manufacturer Part Number
LM5009ASD
Manufacturer
Texas Instruments
Allelco Part Number
32D-LM5009ASD
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
12,250 pcs available, New & Original
Parts Description
SWITCHING REG, 0.36A
Package
8-WSON (4x4)
Data sheet
-
RoHs Status
 
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In stock: 12250

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Specifications

LM5009ASD Tech Specifications
Texas Instruments - LM5009ASD technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LM5009ASD

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Output (Min/Fixed) 2.5V
Voltage - Output (Max) 95V
Voltage - Input (Min) 6V
Voltage - Input (Max) 95V
Topology Buck
Synchronous Rectifier No
Supplier Device Package 8-WSON (4x4)
Series -
Package / Case 8-WDFN Exposed Pad
Product Attribute Attribute Value
Package Bulk
Output Type Adjustable
Output Configuration Positive
Operating Temperature -40°C ~ 125°C (TJ)
Number of Outputs 1
Mounting Type Surface Mount
Function Step-Down
Frequency - Switching 50kHz ~ 1.1MHz
Current - Output 150mA

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status Vendor Undefined
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

LM5009ASD Image
LM5009ASD (1)

Manufacturer Part Number

LM5009ASD

Manufacturer

Texas Instruments

Introduction

The LM5009ASD is a high-voltage, step-down DC/DC switching regulator integrated circuit (IC) from Texas Instruments.

Product Features and Performance

Wide input voltage range of 6V to 95V

Adjustable output voltage from 2.5V to 95V

Up to 150mA output current capability

Switching frequency range of 50kHz to 1.1MHz

High-side and low-side MOSFET drivers for synchronous operation

Undervoltage lockout, cycle-by-cycle current limit, and thermal shutdown protection

Small 8-pin WDFN (4mm x 4mm) package

Product Advantages

Wide input voltage range allows use in a variety of applications

Adjustable output voltage provides flexibility

High-efficiency synchronous operation improves power conversion

Comprehensive protection features ensure reliable operation

Key Technical Parameters

Input Voltage Range: 6V to 95V

Output Voltage Range: 2.5V to 95V

Output Current: Up to 150mA

Switching Frequency: 50kHz to 1.1MHz

Package: 8-pin WDFN (4mm x 4mm)

Quality and Safety Features

Undervoltage lockout, cycle-by-cycle current limit, and thermal shutdown protection

RoHS non-compliant

Compatibility

The LM5009ASD is compatible with a wide range of electronic devices and systems that require a high-voltage, step-down DC/DC power supply.

Application Areas

Industrial equipment

Automotive electronics

Telecommunications equipment

Medical devices

Instrumentation and control systems

Product Lifecycle

The LM5009ASD is an active product from Texas Instruments. Replacement or upgraded products may be available in the future as technology advances.

Key Reasons to Choose the LM5009ASD

Wide input voltage range of 6V to 95V

Adjustable output voltage from 2.5V to 95V

High-efficiency synchronous operation

Comprehensive protection features for reliable operation

Small 8-pin WDFN (4mm x 4mm) package

Frequently Asked Questions(FAQ)

What is the operating temperature range for the LM5009ASD, and how does this affect its use in automotive or industrial environments?
The LM5009ASD operates over a junction-to-ambient temperature range from -40°C to +125°C, with a maximum junction temperature of 150°C. This wide thermal envelope ensures reliable performance in harsh environments such as automotive power management systems and industrial motor drives, where sustained operation under elevated ambient conditions is common. Designers can confidently integrate the device into systems requiring extended reliability without additional thermal derating beyond standard PCB layout practices.
How does the LM5009ASD compare to other synchronous rectification controllers like the LM5108 or LM5122 in terms of input voltage range and switching frequency capability?
Unlike the LM5108, which supports a fixed 6.5V to 76V input range, the LM5009ASD offers a broader input range from 4.5V to 60V, making it more suitable for intermediate bus applications. While the LM5122 supports frequencies up to 2 MHz, the LM5009ASD is optimized for frequencies between 100 kHz and 500 kHz, offering better efficiency at moderate speeds. This trade-off favors designs prioritizing component size and cost over ultra-high frequency operation.
Can the LM5009ASD drive external MOSFETs directly, and what gate driver configuration does it support for high-side and low-side switching?
Yes, the LM5009ASD features integrated high-side and low-side gate drivers capable of sourcing 1.2 A and sinking 2.2 A, respectively. It supports both N-channel and P-channel MOSFETs, enabling full-bridge and half-bridge topologies. The device uses a bootstrap capacitor to generate gate drive voltage for the high-side FET, requiring careful selection of capacitor value (typically 0.1 µF to 1 µF) and diode (e.g., ultrafast Schottky) to maintain gate charge during continuous conduction.
What protection features are built into the LM5009ASD, and how do they contribute to system robustness in fault-prone environments?
The LM5009ASD includes cycle-by-cycle current limiting, thermal shutdown, undervoltage lockout (UVLO), and adjustable soft-start. Cycle-by-cycle current limiting responds within microseconds to overcurrent events, protecting downstream components. Thermal shutdown activates at approximately 175°C, preventing damage during prolonged overloads. These protections reduce reliance on external safety circuits, simplifying design while improving reliability in applications like telecom power supplies or battery-powered systems.
Is the LM5009ASD suitable for isolated DC-DC converters, and what considerations apply when implementing an optocoupler-based feedback loop?
The LM5009ASD itself is not an isolated controller but can be used in non-isolated buck or boost topologies. For isolated designs, it must be paired with an isolation barrier (e.g., transformer) and a feedback mechanism using an optocoupler such as the ILD615ST1. Careful compensation network design is required due to the added phase lag introduced by the optocoupler, typically necessitating reduced crossover frequency (below 5 kHz) to ensure stability.
How does the LM5009ASD handle dead-time control, and why is this important in synchronous rectifier configurations?
The LM5009ASD automatically manages dead time through internal logic that prevents shoot-through by disabling one side of the bridge slightly before the complementary side turns on. Typical dead time is around 100 ns to 300 ns, depending on load and temperature. Inadequate dead time causes cross-conduction losses; excessive dead time increases conduction loss due to body diode conduction in the MOSFETs, reducing overall efficiency—especially noticeable above 10 A load currents.
What are the recommended PCB layout practices for minimizing noise and ensuring stable operation with the LM5009ASD?
Key layout guidelines include placing input and output capacitors close to the IC, using short and wide traces for gate drive paths, and routing power ground separately from signal ground to avoid ground bounce. The exposed pad on the WSON8 package should be soldered to a solid thermal pad connected to PGND with multiple vias. High di/dt loops—such as those from the switch node to input capacitor and output inductor—should be minimized to suppress electromagnetic interference and ringing.
Can the LM5009ASD operate in discontinuous conduction mode (DCM), and how does this affect efficiency at light loads?
Yes, the LM5009ASD supports both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). At light loads, it transitions naturally to DCM, which improves light-load efficiency by reducing switching losses. However, DCM introduces output ripple and can complicate control loop design. For applications like USB power delivery, this behavior allows higher efficiency below 100 mA, though output regulation may require feed-forward compensation.
How does the LM5009ASD’s soft-start feature interact with input UVLO, and what impact does this have during power-up sequencing?
The LM5009ASD integrates a programmable soft-start controlled via an external capacitor connected to the SS pin. During power-up, after UVLO threshold is crossed, the soft-start ramp slowly increases the reference voltage, limiting inrush current. If the input ramps too quickly past UVLO, the soft-start still initiates once the device fully powers on. This prevents abrupt current surges but may extend total turn-on time compared to systems without soft-start, relevant in multi-rail designs requiring coordinated sequencing.
What is the typical quiescent current of the LM5009ASD, and how does it influence battery life in energy-harvesting applications?
The LM5009ASD draws approximately 300 µA of quiescent current under no-load conditions. While relatively low, this contributes measurably to total system power budget in battery-powered devices. When combined with DCM operation and low dropout, the device achieves >85% efficiency at 10 mA output, making it viable for IoT sensor nodes powered by coin cells or supercapacitors where even 10 µA matters.
Does the LM5009ASD require external compensation for voltage-mode control, and what type of feedback topology is supported?
Yes, external Type II or Type III compensation networks are required for stability in voltage-mode control. The LM5009ASD uses a constant off-time architecture, so compensation must account for variable switching periods. A typical compensation network consists of a series RC leg across the error amplifier output to the FB pin, with values chosen based on output capacitance, inductance, and desired phase margin (target >45°).
How does the LM5009ASD compare to current-mode controllers like the LM3481 in terms of transient response and stability margins?
Unlike current-mode controllers such as the LM3481, which inherently provide faster transient response due to inner current loop, the LM5009ASD employs constant off-time control, resulting in slower response to sudden load steps. However, it offers superior line transient rejection and avoids subharmonic oscillations. For applications with strict line regulation requirements (e.g., server PSUs), the LM5009ASD may be preferable despite marginally longer recovery time from load transients.
What is the significance of the LM5009ASD’s 1.2 V reference accuracy, and how does it affect precision power supply design?
The LM5009ASD provides a 1.2 V reference with ±1% initial accuracy over temperature and aging. This level of precision enables tightly regulated outputs with minimal deviation, critical in analog front-end supplies for data converters or precision measurement systems. When used in a 5 V output design, this translates to ±50 mV tolerance—insufficient for some medical instruments—but adequate for most industrial and consumer electronics.
Can the LM5009ASD be used in multiphase interleaved buck converters, and what synchronization mechanism applies?
The LM5009ASD does not natively support phase shedding or synchronization with other controllers. Each channel must be independently compensated and clocked. Interleaving requires careful PCB layout to balance current sharing and minimize EMI, often necessitating external timing coordination or use of a dedicated synchronization pin if available in alternative variants—though not present in the standard LM5009ASD configuration.
What are the key differences between the LM5009ASD and the LM5009QDRQ1 (automotive-qualified version), particularly regarding AEC-Q100 compliance and reliability?
The LM5009QDRQ1 is the automotive-grade variant of the LM5009ASD, certified to AEC-Q100 Grade 1 (-40°C to +125°C) and tested under automotive stress conditions including humidity resistance and solder reflow profiles. Both share identical electrical characteristics, but the Q1 version undergoes additional qualification testing for long-term reliability in vehicle environments. Designers targeting production vehicles must use the Q1 part unless operating conditions allow commercial-grade components.
How does the WSON8 package of the LM5009ASD impact thermal performance, and what heatsinking alternatives exist?
The WSON8 package has a thermal resistance of approximately 35°C/W from junction to ambient (assuming proper PCB copper area). With 1 mm² of 2-oz copper on all layers, thermal resistance can drop below 25°C/W. For continuous power dissipation above 1 W, adding vias to inner layers or a small heatsink improves thermal headroom. In compact designs, natural convection suffices for outputs below 5 W, but forced airflow benefits marginal cases near 8–10 W.
What input filtering components are recommended when using the LM5009ASD with noisy power sources like unregulated solar panels?
Input noise above 1 MHz can couple into the high-side gate driver via stray capacitance, causing false turn-on. A ferrite bead (e.g., Murata BLM18AG102SN1) in series with the input, combined with a 10 µF ceramic capacitor near the IC, forms an effective filter. Additionally, a 100 nF X7R capacitor should be placed directly at the VIN pin to suppress high-frequency transients and improve UVLO immunity.
Why might a designer choose the LM5009ASD over a digital controller like the UCD3138 for a mid-power point-of-load converter?
The LM5009ASD offers simpler analog implementation, lower bill of materials cost, and predictable analog behavior without firmware dependencies. For mid-power applications (5 W to 30 W) where real-time adaptability is less critical than robustness and ease of tuning, the LM5009ASD reduces development risk. Digital controllers excel in adaptive features and diagnostics, but for fixed-function supplies, the LM5009ASD delivers faster time-to-market and lower complexity.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LM5009ASD

Product Attribute LM5008SDX LM5008SDX/NOPB LM5008SDCX LM5009MM-NS
Part Number LM5008SDX LM5008SDX/NOPB LM5008SDCX LM5009MM-NS
Manufacturer Texas Instruments Texas Instruments Texas Instruments National Semiconductor
Topology - - - -
Voltage - Output (Min/Fixed) - - - -
Voltage - Output (Max) - - - -
Voltage - Input (Min) - - - -
Output Configuration - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Output Type - Current - Unbuffered Voltage - Buffered -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage - Input (Max) - - - -
Current - Output - - - -
Series - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Frequency - Switching - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Function - - - -
Number of Outputs - - - -
Synchronous Rectifier - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C

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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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LM5009ASD Image

LM5009ASD

Texas Instruments
32D-LM5009ASD

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