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LM5574 -
SIMPLE SWITCHER® 75V, 0.5A Step-Down Switching Regulator from the PowerWise® Family
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Features
| • | LM5574Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified (−40°C to + 125°C operating junction temperature) |
| • | Integrated 75V, 750mΩ N-channel MOSFET |
| • | Ultra-wide input voltage range from 6V to 75V |
| • | Adjustable output voltage as low as 1.225V |
| • | 1.5% feedback reference accuracy |
| • | Operating frequency adjustable between 50kHz and 500kHz with single resistor |
| • | Master or slave frequency synchronization |
| • | Adjustable soft-start |
| • | Emulated current mode control architecture |
| • | Wide bandwidth error amplifier |
| • | Built-in protection |
| • | Automotive Grade product datasheet that is AEC-Q100 grade 0 qualified is available upon request |
| • | (−40°C to + 150°C operating junction temperature) |
General Description
The LM5574 is an easy to use SIMPLE SWITCHER® buck regulator which allows design engineers to design and optimize a robust
power supply using a minimum set of components. More...
Applications
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Typical Application
*click for larger image
| Parameters | Values |
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| Output Current |
500 mA |
| Input Min Voltage |
6 Volt |
| Input Max Voltage |
75 Volt |
| Output Min |
1.23 Volt |
| Output Max |
70 Volt |
| Frequency Min |
50 kHz |
| Frequency Max |
500 kHz |
| Efficiency (peak) |
85 % |
| On/Off Pin |
Yes |
| Error Flag |
No |
| SoftStart |
Yes |
| Sync Pin |
Yes |
| Inverting |
Yes |
| Flyback |
No |
| RegType |
Switching Regulator |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Adjustable Output |
Yes |
| Adj Switch Frequency |
Yes |
| PWM Mode |
Current |
| Topology |
Buck |
| Special Features |
1.5% feedback voltage accuracy, emulated current mode |
| Step-Down |
Yes |
| Multiple Output Capability |
No |
| Output Power |
Undefined Watt |
| Output Voltage |
Undefined Volt |
| Output Range |
1.23V to 70V |
| Switching Frequency |
500 kHz |
| Regulator Family |
SIMPLE SWITCHER |
| AEC Q-100 Automotive Grade |
1 |
| Automotive |
Yes |
| PowerWise |
Yes |
| Synchronous Rectification |
No |
Typical Performance
*click for larger image
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WEBENCH Live Simulation!
Also Recommended
| LM25574▲ | 42V Input Voltage Max, 0.5A Output Current |
| LM25575▲ | 42V Input Voltage Max, 1.5A Output Current |
| LM25576▲ | 42V Input Voltage Max, 3A Output Current |
| LM5575▲ | 75V Input Voltage Max, 1.5A Output Current |
| LM5576▲ | 75V Input Voltage Max, 3A Output Current |
Additional Resources
Online Seminars
Design Tools
Application Notes
Block Diagram
*click for larger image
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
 |
| LM5574/LM5574Q SIMPLE SWITCHER® 75V, 0.5A Step-Down Switching Regulator |
434
Kbytes |
23-Mar-09 |
Download |
LM5574/LM5574Q SIMPLE SWITCHER® 75V, 0.5A Step-Down Switching Regulator (Japanese)
 |
571 Kbytes |
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Package Availability, Models, Samples & Pricing
General Description
The LM5574 is an easy to use SIMPLE SWITCHER® buck regulator which allows design engineers to design and optimize a robust
power supply using a minimum set of components. Operating with an input voltage range of 6 - 75V, the LM5574 delivers 0.5A
of continuous output current with an integrated 750mΩ N-Channel MOSFET. The regulator utilizes an Emulated Current Mode architecture
which provides inherent line regulation, tight load transient response, and ease of loop compensation without the usual limitation
of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50kHz to 500kHz to
allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple IC’s from the LM(2)557x
family to self-synchronize or to synchronize to an external clock. The LM5574 guarantees robustness with cycle-by-cycle current
limit, short-circuit protection, thermal shut-down, and remote shut-down. The device is available in a TSSOP-16 package. The
LM5574 is supported by the full suite of WEBENCH On-Line design tools.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LM5574MT | ABCD150XV1 | 0 | 3868 | 0 | 0 | 2595000 | 2 | 736338335
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LM5574MTX | ABCD150XV1 | 0 | 3868 | 0 | 0 | 2595000 | 2 | 736338335
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LM5574QMT | ABCD150XV1 | 0 | 3868 | 0 | 0 | 2595000 | 2 | 736338335
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LM5574QMTX | ABCD150XV1 | 0 | 3868 | 0 | 0 | 2595000 | 2 | 736338335
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Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Design Tools
| Title | Size in Kbytes |
Date |
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| Current Mode Modeling - Reference Guide |
1372 Kbytes |
1-Aug-2007 |
View Online |
Download |
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| Understanding and Applying Current-Mode Control Theory |
427 Kbytes |
8-Jan-2008 |
View Online |
Download |
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| Downloadable LM(2)557x Quick Start SIMPLE SWITCHER Component Calculator |
230 Kbytes |
28-Jun-2007 |
View |
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Reference Designs
Application Notes
| Title | Size in Kbytes |
Date |
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| AN-1568: Application Note 1568 LM5574 Evaluation Board |
428
Kbytes |
18-Mar-07 |
Download |
AN-1568 (Japanese): Application Note 1568 LM5574 Evaluation Board
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233 Kbytes |
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AN-1568 (Chinese): Application Note 1568 LM5574 Evaluation Board
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279 Kbytes |
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| AN-1563: Application Note 1563 Quick Start Guide for a 0.5 Amp Buck Regulator Using The LM5574 and LM25574 |
89
Kbytes |
17-Mar-07 |
Download |
AN-1563 (Japanese): Application Note 1563 Quick Start Guide for a 0.5 Amp Buck Regulator Using The LM5574 and LM25574
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135 Kbytes |
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AN-1563 (Chinese): Application Note 1563 Quick Start Guide for a 0.5 Amp Buck Regulator Using The LM5574 and LM25574
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263 Kbytes |
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More Application Notes
| Title | Size in Kbytes |
Date |
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| AN-1566: Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs |
370
Kbytes |
7-Feb-07 |
Download |
AN-1566 (Japanese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs
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442 Kbytes |
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AN-1566 (Chinese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs
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282 Kbytes |
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| AN-1574: Application Note 1574 LM5073 Evaluation Board |
464
Kbytes |
24-Apr-07 |
Download |
| AN-1571: Application Note 1571 Quick Start Guide for a 1.5 Amp Buck Regulator Using the LM5575 and LM25575 |
91
Kbytes |
18-Mar-07 |
Download |
AN-1571 (Japanese): Application Note 1571 Quick Start Guide for a 1.5 Amp Buck Regulator Using the LM5575 and LM25575
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143 Kbytes |
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AN-1571 (Chinese): Application Note 1571 Quick Start Guide for a 1.5 Amp Buck Regulator Using the LM5575 and LM25575
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222 Kbytes |
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| AN-1572: Application Note 1572 Quick Start Guide for a 3 Amp Buck Regulator Using the LM5576 and LM25576 |
91
Kbytes |
18-Mar-07 |
Download |
AN-1572 (Japanese): Application Note 1572 Quick Start Guide for a 3 Amp Buck Regulator Using the LM5576 and LM25576
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144 Kbytes |
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AN-1572 (Chinese): Application Note 1572 Quick Start Guide for a 3 Amp Buck Regulator Using the LM5576 and LM25576
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224 Kbytes |
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| AN-1569: Application Note 1569 LM5575 Evaluation Board |
158
Kbytes |
18-Mar-07 |
Download |
AN-1569 (Japanese): Application Note 1569 LM5575 Evaluation Board
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190 Kbytes |
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AN-1569 (Chinese): Application Note 1569 LM5575 Evaluation Board
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241 Kbytes |
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| AN-1570: Application Note 1570 LM5576 Evaluation Board |
160
Kbytes |
18-Mar-07 |
Download |
AN-1570 (Japanese): Application Note 1570 LM5576 Evaluation Board
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259 Kbytes |
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AN-1570 (Chinese): Application Note 1570 LM5576 Evaluation Board
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242 Kbytes |
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[Information as of 7-Nov-2009]
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