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Power Management
17 components in this category · Sourced from authorized channels · 24-hour quotes
Power management ICs convert, regulate and protect the electrical energy that every electronic system runs on. Our inventory covers the three most common topologies: linear regulators (AMS1117-3.3, HT7533) for low-noise post-regulation from 5 V to 3.3 V; switching buck converters (TPS54331) for efficient step-down from 12 V or 24 V rails; and precision shunt references (TL431) for feedback loops in switch-mode power supplies. Whether you are building a battery-powered IoT sensor that needs microamp quiescent current, or an industrial controller that needs 3 A at 90% efficiency, we have the right regulator in stock with full datasheets and application notes.
Available Parts
AMS1117-3.3
Advanced Monolithic Systems
SOT-223
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TL431
Texas Instruments
TO-92 / SOT-23
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TPS54331
Texas Instruments
SOP-8
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HT7533
Holtek
SOT-89 / TO-92
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LM7805
onsemi
TO-220
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LM317
Texas Instruments
TO-220
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LM2596
Texas Instruments
TO-263 / TO-220
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MP1584EN
Monolithic Power Systems
SOP-8
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XL6009
XLSEMI
TO-263-5
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AMS1117-1.8
Advanced Monolithic Systems
SOT-223
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AMS1117-2.5
Advanced Monolithic Systems
SOT-223
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AMS1117-5.0
Advanced Monolithic Systems
SOT-223
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TP4056
NanJing TopPower
SOP-8
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BQ24295
Texas Instruments
QFN-24
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IP5328P
Injoinic
SOP-16 / QFN
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SG3525A
onsemi
DIP-16
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XL4015
XLSEMI
TO-263-5
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Power Management – Frequently Asked Questions
When should I use an LDO versus a buck converter?
Use an LDO (AMS1117, HT7533) when the voltage difference between input and output is small (under 1.5 V), when you need ultra-low output noise for analog or RF circuits, or when load current is under 500 mA. Use a buck converter (TPS54331) when the voltage difference is large (12 V to 3.3 V), when load current exceeds 500 mA, or when efficiency matters — buck converters run at 85-95% efficiency versus 30-60% for an LDO under high differential.
What is quiescent current and why does it matter?
Quiescent current (Iq) is the current the regulator draws just to keep itself running, independent of load. For battery-powered designs, Iq dominates standby battery life. The AMS1117 draws 5-8 mA — terrible for battery use. The HT7533 draws 4 µA — 1,000× better. For coin-cell or Li-ion designs with long sleep periods, always spec a low-Iq LDO.
Can I parallel two LDOs for higher current?
Generally no. LDOs do not share current evenly due to output voltage tolerance mismatch (±1-2%). The unit with slightly higher output voltage sources all the current and overheats. For higher current, choose a single LDO rated for the target current, or use a buck converter.
What capacitors do I need around a regulator?
Every LDO requires input and output capacitors for stability. AMS1117 needs 10 µF tantalum or 22 µF ceramic on output plus 100 nF bypass. HT7533 needs only 1 µF ceramic on output. TPS54331 needs 2× 10 µF ceramic on input and 2× 22 µF ceramic on output plus a 22 µH inductor. Always follow the datasheet reference design — skipping capacitors causes oscillation.
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