Do you have a good super capacitor charge IC?
Dear Sir/Madam, I am serching the super capacitor charge IC such as LTC3625.The voltage of output capacitor will be less than 3V(replacement as Li-Ion battery). Otherwise do you have a good application...
View Articlesome ways to discuss some ac to dc methods.
I am a chip designer. I have some questions about the isopower icoupler.Now I want to use a simple device to convert the 220Vac to a low DC (1~3V current is around 10mA). The efficiency demand is not...
View ArticleRegarding Power supply isolation between RF ICs
Hello, I have in my design, a central 6 V supply from a buck converter and this is driving three 5V LDOs. 3 LDOs were selected to isolate the RFICs. LDO2 and LDO3 are powering a modulator and a...
View ArticleCurrent Sense methods in switching regulators
What current sense methods are used in switching regulators today? What are the advantages and disadvantages of each method?
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3 Phase PFC Design - clarification/suggestion requested
Dear All I am in the early stages of designing a 3-phase Power Factor Correction module for driving a 345V, 6A, 1500W industrial load. Input specification is 3-phase Delta supply 240V - 480V AC. I am...
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ADP5587 SPEC. Question
Dear Sir:ADP5587 can be used for push-pull architecture? Another AD5587 GPIO(R0~R7,C0~C7) ,If useing Open-drain or push-pull mode in system design. Each GPIO can accept the sink current is how much?...
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ADP2503/04 Bost Power Control
Dear All:ADP2503/ADP2504 SYNC pin how can control is very energy efficient? My ADP2504 SYNC pin need MCU GPIO to control It. maybe long time at pull-down but some times need at pull-up. so can you tell...
View ArticleADP2120 operating in a discontinuous mode when synchronized.
I have an ADP2120 circuit that is operating it what looks like a discontinuous mode, but is synchronized to an input clock. The circuit is a 5V to 3.3 V circuit using the component values I got from...
View ArticleHow do I calculate LDO (Low Drop out Regulators) efficiency?
How do I calculate LDO (Low Drop out Regulators) efficiency?
View ArticleSelecting input power - external, usb or batteries
Hi, I'm modifying an existing design that has 3 different power inputs: Ext power - ~12VBatteries - 6 x AAUSB - 5V The design currently just diode 'OR's' the supplies together before the main switching...
View Articleany suggested footprint for ADP198 (LFCSP package = CP-8-10)
I found a suggested footprint for package CP-8-8 (very close to the CP-8-10) but there's no footprint PDF for the CP-8-10 (used on ADP198). My thougth was to modify the CP-8-8 footprint, making the...
View ArticleBattery Management, LED Driver ICs
Hi! I’m hoping you can help me... I am looking to develop a new bike light, but need help determining which components to use. The choices are overwhelming! I realize that you are primarily an IC...
View ArticleLi-Ion (Lithium) Battery - Charger and protection ICs ???
Hi. I am designing a power supply where I will also need to use a backup battery.The choosen battery type was a Li-Ion (Lithium) type, which has a nominal cell voltage of 3.7V .I have little experience...
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ADP558x I/O Expander Application
Dear All:I study ADP558x I/O Expander for LED status control application. my required specificationsand ADP558x applicationquestion pls see below. Thanks. My Requirest(Design idea):A:)Total...
View ArticleSwitching regulator's output ripple.
Does higher output ripple of a switching regulator mean better transient performance?
View ArticleADP151 draws high current with output capacitor; outputs +0,2V without
Hi, I designed three ADP151 LDOs (two 2,5V and one 1,8V) into my latest circuit.Yesterday I got the PCBs and was suprised in a way. All three are drawing too high currents without loads. If I would let...
View ArticleADP1621 SEPIC Design
Hi, We are planning on using the ADP1621 and the AD5292 to create a digitally controllable voltage regulator circuit that can output 1.215V to 26.3V up to 2A, the problem is we are limited with...
View ArticleCurrent Sense methods in switching regulators
What current sense methods are used in switching regulators today? What are the advantages and disadvantages of each method?
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12V / 6A Power supply. Help with Buck and Boost converters + OR'ing circuit
Hello all.I would like to receive some suggestions of ICs / considerations about this design.The picture below states how this power supply should work. Details:1) IC 1 probably will be a LT3650-8.4...
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Adjustable vs. fixed voltage option
Some parts are available as fixed output voltage options. Can I adjust the output voltage anyway?This is a question that comes up often with parts like the ADP2108, ADP2109 or ADP2138, ADP2139 that do...
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