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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsLM2574HVM-3.3
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LM2574HVM-3.3 - Texas Instruments

Manufacturer Part Number
LM2574HVM-3.3
Manufacturer
Texas Instruments
Allelco Part Number
32D-LM2574HVM-3.3
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,510 pcs available, New & Original
Parts Description
IC REG BUCK 3.3V 500MA 14SOIC
Package
14-SOIC
Data sheet
-
RoHs Status
 
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Specifications

LM2574HVM-3.3 Tech Specifications
Texas Instruments - LM2574HVM-3.3 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LM2574HVM-3.3

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Output (Min/Fixed) 3.3V
Voltage - Output (Max) -
Voltage - Input (Min) 4V
Voltage - Input (Max) 60V
Topology Buck
Synchronous Rectifier No
Supplier Device Package 14-SOIC
Series SIMPLE SWITCHER®
Package / Case 14-SOIC (0.295', 7.50mm Width)
Product Attribute Attribute Value
Package Tube
Output Type Fixed
Output Configuration Positive
Operating Temperature -40°C ~ 125°C (TJ)
Number of Outputs 1
Mounting Type Surface Mount
Function Step-Down
Frequency - Switching 52kHz
Current - Output 500mA
Base Product Number LM2574

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 2A (4 Weeks)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

LM2574HVM-3.3 Image
LM2574HVM-3.3 (1)

Manufacturer Part Number

LM2574HVM-3.3

Manufacturer

Texas Instruments

Introduction

The LM2574HVM-3.3 is part of the SIMPLE SWITCHER® series from Texas Instruments, designed for easy-to-use step-down (buck) voltage regulation in various electronic applications.

Product Features and Performance

Simple and easy-to-use step-down voltage regulator

Capable of driving a 500mA load with excellent line and load regulation

Requires a minimum number of external components for operation

Fixed 3.3V output voltage

Operates at a switching frequency of 52kHz

Thermal shutdown and current limit for safety

Product Advantages

Versatility with a wide input voltage range from 4V to 60V

Robust thermal performance with a junction operating temperature range from -40°C to 125°C

High-efficiency design suitable for battery-powered systems

Small footprint with surface mount 14-SOIC package

Key Technical Parameters

Step-Down (Buck) topology

Positive output configuration

One output channel

4V minimum input voltage

60V maximum input voltage

3V fixed output voltage

500mA current output

52kHz switching frequency

Non-synchronous rectifier

Operating temperature from -40°C to 125°C (TJ)

14-SOIC package

Quality and Safety Features

Built-in current limit

Internal thermal shutdown protection

Sturdy construction for enhanced durability

Compatibility

Compatible with surface mount technology for PCB integration

Application Areas

Used in a variety of applications including consumer electronics, computers, and telecommunication devices

Product Lifecycle

Obsolete status indicating the model is discontinued

Replacement or upgrade options may be available through Texas Instruments support

Several Key Reasons to Choose This Product

Established SIMPLE SWITCHER® series product ensures reliability and ease of use

Wide input voltage range suitable for multiple power sources

Fixed voltage output eliminates the need for external voltage setting components

Integrated safety features prevent damage from overcurrent or excessive temperature

Texas Instruments reputation for quality and robustness in power management solutions

Frequently Asked Questions(FAQ)

How does the LM2574HVM-3.3 compare to other fixed-output buck regulators in terms of input voltage range and efficiency at light loads when converting 12V to 3.3V?
The LM2574HVM-3.3 supports an input voltage range from 4V to 60V, making it suitable for automotive and industrial applications where transients or wide supply variations are common. When stepping down 12V to 3.3V, typical efficiency reaches approximately 80–85% under full load, though it drops to around 50–60% at light loads due to its asynchronous rectification architecture and lack of synchronous switching. This is lower than modern synchronous buck converters like the TPS5420 or LM2678 with integrated diodes, which maintain higher efficiency across the load spectrum. However, the LM2574HVM-3.3 offers simplicity, low external component count, and robust thermal performance—advantages that may justify the efficiency trade-off in cost-sensitive designs.
What design considerations should be taken into account when selecting output capacitors for the LM2574HVM-3.3 to ensure stability over temperature and aging?
For stable operation with the LM2574HVM-3.3, ceramic output capacitors are preferred due to their low ESR and good performance across temperature. A minimum of 10µF X7R or X5R dielectric is typically required, but using a value closer to 22–47µF improves transient response and reduces output ripple. Capacitor aging must be considered: over time, ceramic capacitance decreases by up to 20% after 1,000 hours, so derating is advisable. Additionally, high-quality polymer or tantalum capacitors can be used if ESR remains below 1Ω. Always verify phase margin and transient behavior during bench testing, as capacitor selection directly affects loop stability and overshoot.
Can the LM2574HVM-3.3 operate reliably in automotive environments, and what precautions are needed regarding EMI and layout?
The LM2574HVM-3.3 is rated for -40°C to +125°C junction temperature, meeting many automotive temperature requirements, but it is not officially qualified to AEC-Q100. In practice, it has been used successfully in automotive lighting and infotainment systems. To minimize EMI, keep the switching node (SW pin) area small, use a ground plane beneath the IC, and place input/output capacitors close to the device. A snubber circuit across the inductor may be necessary for high-inductance loads. Routing traces should avoid sensitive analog lines, and shielding may be required in tightly packed PCBs.
What is the difference between the LM2574HVM-3.3 and LM2574N-3.3 in terms of package and thermal characteristics?
The LM2574HVM-3.3 uses a 14-pin SOIC PowerPAD™ package, which features an exposed thermal pad for improved heat dissipation compared to standard SOIC packages. This allows better thermal performance under continuous 500mA loads. The LM2574N-3.3, on the other hand, is housed in a standard 14-pin PDIP package without a thermal pad, offering significantly lower power handling and worse thermal conductivity. As a result, the HVM version can sustain higher ambient temperatures and longer operating durations before thermal shutdown, making it more suitable for compact, thermally constrained designs.
How does the switching frequency of the LM2574HVM-3.3 affect inductor selection and PCB space requirements?
With a fixed internal switching frequency of 52kHz, the LM2574HVM-3.3 allows the use of smaller inductors compared to much lower-frequency regulators. For a 12V-to-3.3V conversion, a 100–220µH ferrite bead with 1A saturation current is commonly selected. The larger core size relative to higher-frequency designs reduces core losses, improving efficiency. However, the trade-off is increased acoustic noise and potentially larger output ripple. Due to the moderate frequency, PCB layout must still ensure low parasitic inductance in the feedback and compensation network to maintain stability.
Is it acceptable to substitute the LM2574HVM-3.3 with the NOPB variant in production designs, and what differences should engineers verify?
Yes, the LM2574HVM-3.3/NOPB is functionally identical to the lead-free version and meets RoHS compliance standards. The only differences are the absence of lead content and possible minor changes in solder reflow profile compatibility. Engineers should confirm that the PCB assembly process supports lead-free soldering temperatures (typically >240°C peak). Otherwise, electrical performance, thermal characteristics, and pinout remain unchanged. Both versions can be interchanged in design files and BOMs without altering circuit topology or compensation.
What are the risks of using the LM2574HVM-3.3 near its maximum input voltage of 60V, especially in unregulated input scenarios?
Operating near 60V input—such as in a battery stack with no regulation—can stress internal components, particularly the pass transistor and gate drive circuitry. At sustained 60V input, power dissipation increases due to higher conduction losses, even at light loads. Thermal management becomes critical, and derating to 48V max is often recommended in high-reliability applications. Additionally, transient spikes above 60V (e.g., from inductive kickback) may damage the device unless protected by a TVS diode. Designers should include input filtering and clamping circuits when sourcing from unstable or high-impedance supplies.
How does the absence of synchronous rectification in the LM2574HVM-3.3 impact system efficiency and thermal design compared to newer alternatives?
Without synchronous rectification, the LM2574HVM-3.3 uses an external Schottky diode for freewheeling, which introduces forward voltage drop and reverse recovery losses. This results in lower efficiency—especially at higher input voltages—and generates additional heat at the diode. While this simplifies control logic and reduces cost, it limits performance in high-current or wide-input-range applications. Newer synchronous buck regulators replace the diode with a MOSFET, cutting conduction and switching losses significantly. In designs requiring >500mA or >90% efficiency, synchronous solutions may be preferable despite added complexity.
Can the LM2574HVM-3.3 support remote sensing or output voltage trimming in precision power delivery systems?
No, the LM2574HVM-3.3 does not support remote sensing or active voltage trimming. Its output voltage is fixed at 3.3V via internal feedback resistors. To adjust output voltage, an external resistive divider must be connected to the FB pin, but this alters accuracy and temperature drift. Remote sensing, which compensates for IR drop in PCB traces, requires dedicated differential input stages not present in this device. For systems needing precise voltage regulation under variable load conditions, linear post-regulators or digitally controlled DC-DC converters may offer better performance.
What is the expected lifetime of the LM2574HVM-3.3 under continuous operation at 85°C ambient temperature with 500mA output current?
Assuming proper thermal design with a junction temperature kept below 110°C, the LM2574HVM-3.3 can achieve functional lifetimes exceeding 20 years based on industry reliability models. Key factors include capacitor aging, solder joint fatigue, and semiconductor degradation. At 85°C ambient with adequate heatsinking, the device operates well within its thermal envelope. However, electrolytic input/output capacitors may degrade faster under sustained high ripple current. Replacing these every 10–15 years is advisable in long-life applications like industrial controls or embedded systems.
Does the LM2574HVM-3.3 require external compensation, and how sensitive is its feedback loop to component tolerances?
The LM2574HVM-3.3 includes internally compensated feedback circuitry, eliminating the need for external compensation networks in most cases. This simplifies design and reduces part count. However, loop stability can be affected by extreme inductor values, output capacitance types, or PCB parasitics. Variations in feedback resistor tolerance (±5% vs ±1%) slightly shift crossover frequency and phase margin. In borderline layouts, adding a small feedforward capacitor (1–10pF) between FB and VOUT can improve transient response. Nevertheless, the IC is generally robust across standard component choices.
What precautions should be taken when paralleling multiple LM2574HVM-3.3 units to increase total output current?
Paralleling the LM2574HVM-3.3 is not recommended due to lack of current sharing mechanisms and potential for circulating currents. Mismatched output voltages or slight frequency differences can cause one unit to dominate load while overheating. If higher current is needed, redesign the system to use a single regulator capable of greater output, such as the LM2576 or synchronous alternatives. If parallel operation is unavoidable, add series resistors (≥0.1Ω) at each output and accept reduced efficiency and increased complexity. Always validate stability and thermal balance under worst-case conditions.
How does the Moisture Sensitivity Level (MSL) of the LM2574HVM-3.3 influence storage and assembly processes in high-volume manufacturing?
The LM2574HVM-3.3 has an MSL rating of 2A (4 weeks), indicating it can withstand one reflow cycle if stored properly. After opening the moisture barrier bag, it must be assembled within four weeks under controlled humidity (<60% RH) or re-baked before use. Failure to follow JEDEC J-STD-033 guidelines may lead to popcorning during reflow, damaging the device. Production facilities should track lot dates and monitor dry pack integrity. While not as stringent as Level 3 or higher parts, proper handling ensures reliability in surface-mount assembly lines.
What are the key limitations of using the LM2574HVM-3.3 in battery-powered portable devices?
The LM2574HVM-3.3’s relatively low switching frequency (52kHz) and asynchronous architecture result in lower efficiency at light loads compared to switching regulators operating above 1MHz. This increases quiescent current draw and reduces battery life in sleep-mode-dominated applications. Additionally, the 500mA output limit restricts use in modern low-power electronics requiring higher current. While suitable for USB-powered peripherals with moderate loads, it is outperformed by buck-boost or synchronous step-down ICs like the TPS62130 in energy-constrained systems.
Can the LM2574HVM-3.3 be used in solar-powered microcontrollers or IoT nodes, and what protections are essential?
Yes, the LM2574HVM-3.3 can power microcontroller nodes from solar panels with regulated input, but input voltage stability is critical. Solar arrays produce fluctuating voltages; without a charge controller, the input could exceed 60V during partial shading or cold conditions. Essential protections include a reverse-polarity diode, input bulk capacitance, and a transient suppressor rated above the panel’s open-circuit voltage. Also consider brownout detection on the microcontroller side. The 3.3V output is ideal for logic rails, but overall system efficiency depends heavily on upstream regulation quality.
How does the lack of built-in soft-start affect inrush current when using the LM2574HVM-3.3 with large capacitive loads?
The LM2574HVM-3.3 relies on an external capacitor on the SS/CT pin for soft-start functionality. Without it, turn-on occurs abruptly, causing high inrush current into large output capacitors (e.g., >100µF). This surge stresses the input source and may trigger overcurrent protection. To mitigate, connect a 0.1–1µF capacitor between SS and ground. This limits peak current ramp and reduces stress on upstream components. The soft-start time is approximately 1–2ms per µF of capacitance, allowing gradual output rise and minimizing EMI spikes during startup.
What are the implications of the RoHS non-compliant status of the LM2574HVM-3.3 for EU-based product certification?
Since the LM2574HVM-3.3 is RoHS non-compliant, it cannot be sold freely in the European Union without exemption. Most consumer electronics require full compliance, so using this part may necessitate an exemption under Directive 2011/65/EU Annex III. Common exemptions include "lead in high melting temperature type solder" or "lead in glass of cathode ray tubes, electronic components, and fluorescent tubes." However, exemptions are limited and subject to renewal. Engineers should verify current exemption availability and consider migrating to compliant variants like the NOPB version for future-proofing EU market access.
How does the base product number LM2574 relate to the LM2574HVM-3.3, and what other configurations exist within the family?
The LM2574HVM-3.3 belongs to the broader LM2574 series, differentiated by output voltage (e.g., LM2574HVM-5.0 for 5V), package type (SOIC, TO-220, DIP), and switching frequency options (52kHz or 100kHz variants). The "HVM" suffix indicates a high-voltage (up to 60V), surface-mount SOIC PowerPAD package. Other outputs include 12V, 15V, and adjustable versions using external resistors. All share core architecture but vary in thermal, electrical, and mechanical characteristics. Designers should select based on input range, output requirement, and mounting constraints rather than assuming interchangeability.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LM2574HVM-3.3

Product Attribute LM2574HVM-3.3/NOPB LM2574HVM-5.0-NS LM2574HVM-5.0 LM2574HVM-12
Part Number LM2574HVM-3.3/NOPB LM2574HVM-5.0-NS LM2574HVM-5.0 LM2574HVM-12
Manufacturer Texas Instruments National Semiconductor Texas Instruments Texas Instruments
Function - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Input (Min) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage - Input (Max) - - - -
Voltage - Output (Max) - - - -
Current - Output - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Number of Outputs - - - -
Frequency - Switching - - - -
Series - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Output (Min/Fixed) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Topology - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Synchronous Rectifier - - - -
Output Configuration - - - -

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LM2574HVM-3.3 Image

LM2574HVM-3.3

Texas Instruments
32D-LM2574HVM-3.3

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