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How do integrated charger ICs dissipate differences in VCC and the battery voltage?
PID Control implementation for charging battery really necessary?Solar Cell to DC-DC converter to Li-Ion charing module, is the DC-DC converter necessary?When to read Battery voltage and battery current during chargingPow Management IC: Li-Ion 2.8 - 4.2V; Sys Volts: 3.3VBUCK converter considerations in a battery charger,with battery as a loadCan i charge 18650 single cell using buck converter?Best battery configuration: 1s1p vs 3s1p vs 1s3p?What should be the V specs of a step down transformer for a 10amp car battery chargerIs it safe to charge single 18650 cells without temperature sensing?How does the different types of fast charge affect a lithium battery on a cellphone in terms of heat?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
I was looking at a couple of charging ICs (BQ2002 for instance) and some of the fast charger ICs can charge up to 2A whilst running of a 5v supply. In this case charging a empty 1v NiMH cell means that 4v * 2A ~ 8w is being dissipated by the IC? Do they use some kind of internal buck converter to step the voltage down?
integrated-circuit battery-charging
asked 5 hours ago
user1247060user1247060
105
$endgroup$
add a comment |
$begingroup$
I was looking at a couple of charging ICs (BQ2002 for instance) and some of the fast charger ICs can charge up to 2A whilst running of a 5v supply. In this case charging a empty 1v NiMH cell means that 4v * 2A ~ 8w is being dissipated by the IC? Do they use some kind of internal buck converter to step the voltage down?
integrated-circuit battery-charging
asked 5 hours ago
user1247060user1247060
105
$endgroup$
$begingroup$
I don't think those have an integrated buck converter. The IC is too small to house an inductor. I also don't see anywhere in the BQ2002 datasheet that says 2A.
$endgroup$
– Toor
5 hours ago
1
$begingroup$
A BQ2002 is a Fast-Change Management IC. It doesn't itself pass the charge current - it just controls some external component(s).
$endgroup$
– brhans
5 hours ago
$begingroup$
Read around P 18 of 93. This Power IC selection guide has all types of battery chargers not just the ones in these answers ti.com/lit/pdf/slvt145 BQ2002 is current limited to 2C and others are pulse, linear etc
$endgroup$
– Sunnyskyguy EE75
5 hours ago
add a comment |
$begingroup$
I was looking at a couple of charging ICs (BQ2002 for instance) and some of the fast charger ICs can charge up to 2A whilst running of a 5v supply. In this case charging a empty 1v NiMH cell means that 4v * 2A ~ 8w is being dissipated by the IC? Do they use some kind of internal buck converter to step the voltage down?
integrated-circuit battery-charging
asked 5 hours ago
user1247060user1247060
105
$endgroup$
I was looking at a couple of charging ICs (BQ2002 for instance) and some of the fast charger ICs can charge up to 2A whilst running of a 5v supply. In this case charging a empty 1v NiMH cell means that 4v * 2A ~ 8w is being dissipated by the IC? Do they use some kind of internal buck converter to step the voltage down?
integrated-circuit battery-charging
integrated-circuit battery-charging
asked 5 hours ago
user1247060user1247060
105
asked 5 hours ago
user1247060user1247060
105
asked 5 hours ago
user1247060user1247060
105
asked 5 hours ago
user1247060user1247060
105
asked 5 hours ago
user1247060user1247060
105
105
$begingroup$
I don't think those have an integrated buck converter. The IC is too small to house an inductor. I also don't see anywhere in the BQ2002 datasheet that says 2A.
$endgroup$
– Toor
5 hours ago
1
$begingroup$
A BQ2002 is a Fast-Change Management IC. It doesn't itself pass the charge current - it just controls some external component(s).
$endgroup$
– brhans
5 hours ago
$begingroup$
Read around P 18 of 93. This Power IC selection guide has all types of battery chargers not just the ones in these answers ti.com/lit/pdf/slvt145 BQ2002 is current limited to 2C and others are pulse, linear etc
$endgroup$
– Sunnyskyguy EE75
5 hours ago
add a comment |
$begingroup$
I don't think those have an integrated buck converter. The IC is too small to house an inductor. I also don't see anywhere in the BQ2002 datasheet that says 2A.
$endgroup$
– Toor
5 hours ago
1
$begingroup$
A BQ2002 is a Fast-Change Management IC. It doesn't itself pass the charge current - it just controls some external component(s).
$endgroup$
– brhans
5 hours ago
$begingroup$
Read around P 18 of 93. This Power IC selection guide has all types of battery chargers not just the ones in these answers ti.com/lit/pdf/slvt145 BQ2002 is current limited to 2C and others are pulse, linear etc
$endgroup$
– Sunnyskyguy EE75
5 hours ago
$begingroup$
I don't think those have an integrated buck converter. The IC is too small to house an inductor. I also don't see anywhere in the BQ2002 datasheet that says 2A.
$endgroup$
– Toor
5 hours ago
$begingroup$
I don't think those have an integrated buck converter. The IC is too small to house an inductor. I also don't see anywhere in the BQ2002 datasheet that says 2A.
$endgroup$
– Toor
5 hours ago
1
1
$begingroup$
A BQ2002 is a Fast-Change Management IC. It doesn't itself pass the charge current - it just controls some external component(s).
$endgroup$
– brhans
5 hours ago
$begingroup$
A BQ2002 is a Fast-Change Management IC. It doesn't itself pass the charge current - it just controls some external component(s).
$endgroup$
– brhans
5 hours ago
$begingroup$
Read around P 18 of 93. This Power IC selection guide has all types of battery chargers not just the ones in these answers ti.com/lit/pdf/slvt145 BQ2002 is current limited to 2C and others are pulse, linear etc
$endgroup$
– Sunnyskyguy EE75
5 hours ago
$begingroup$
Read around P 18 of 93. This Power IC selection guide has all types of battery chargers not just the ones in these answers ti.com/lit/pdf/slvt145 BQ2002 is current limited to 2C and others are pulse, linear etc
$endgroup$
– Sunnyskyguy EE75
5 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
BQ2002 and similar ICs don't actually see the charging current path through them. They are just controllers, they don't regulate by themselves. They have an output (the CC pin) which is used to indirectly control the external, high-current passing element.
You can have a look to a reference design provided by TI. The CC output controls a LM317 which is used as the regulating element (where the thermal considerations indeed apply).
This way, you can have a much greater flexibility in your design (use whatever regulator you want, linear or switched, with whatever specs you need for your specific case).
answered 5 hours ago
dimdim
13.6k22569
$endgroup$
$begingroup$
Thank you for the clear explanation
$endgroup$
– user1247060
57 mins ago
add a comment |
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1 Answer
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1 Answer
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$begingroup$
BQ2002 and similar ICs don't actually see the charging current path through them. They are just controllers, they don't regulate by themselves. They have an output (the CC pin) which is used to indirectly control the external, high-current passing element.
You can have a look to a reference design provided by TI. The CC output controls a LM317 which is used as the regulating element (where the thermal considerations indeed apply).
This way, you can have a much greater flexibility in your design (use whatever regulator you want, linear or switched, with whatever specs you need for your specific case).
answered 5 hours ago
dimdim
13.6k22569
$endgroup$
$begingroup$
Thank you for the clear explanation
$endgroup$
– user1247060
57 mins ago
add a comment |
$begingroup$
BQ2002 and similar ICs don't actually see the charging current path through them. They are just controllers, they don't regulate by themselves. They have an output (the CC pin) which is used to indirectly control the external, high-current passing element.
You can have a look to a reference design provided by TI. The CC output controls a LM317 which is used as the regulating element (where the thermal considerations indeed apply).
This way, you can have a much greater flexibility in your design (use whatever regulator you want, linear or switched, with whatever specs you need for your specific case).
answered 5 hours ago
dimdim
13.6k22569
$endgroup$
$begingroup$
Thank you for the clear explanation
$endgroup$
– user1247060
57 mins ago
add a comment |
$begingroup$
BQ2002 and similar ICs don't actually see the charging current path through them. They are just controllers, they don't regulate by themselves. They have an output (the CC pin) which is used to indirectly control the external, high-current passing element.
You can have a look to a reference design provided by TI. The CC output controls a LM317 which is used as the regulating element (where the thermal considerations indeed apply).
This way, you can have a much greater flexibility in your design (use whatever regulator you want, linear or switched, with whatever specs you need for your specific case).
answered 5 hours ago
dimdim
13.6k22569
$endgroup$
BQ2002 and similar ICs don't actually see the charging current path through them. They are just controllers, they don't regulate by themselves. They have an output (the CC pin) which is used to indirectly control the external, high-current passing element.
You can have a look to a reference design provided by TI. The CC output controls a LM317 which is used as the regulating element (where the thermal considerations indeed apply).
This way, you can have a much greater flexibility in your design (use whatever regulator you want, linear or switched, with whatever specs you need for your specific case).
answered 5 hours ago
dimdim
13.6k22569
answered 5 hours ago
dimdim
13.6k22569
answered 5 hours ago
dimdim
13.6k22569
answered 5 hours ago
dimdim
13.6k22569
13.6k22569
$begingroup$
Thank you for the clear explanation
$endgroup$
– user1247060
57 mins ago
add a comment |
$begingroup$
Thank you for the clear explanation
$endgroup$
– user1247060
57 mins ago
$begingroup$
Thank you for the clear explanation
$endgroup$
– user1247060
57 mins ago
$begingroup$
Thank you for the clear explanation
$endgroup$
– user1247060
57 mins ago
add a comment |
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$begingroup$
I don't think those have an integrated buck converter. The IC is too small to house an inductor. I also don't see anywhere in the BQ2002 datasheet that says 2A.
$endgroup$
– Toor
5 hours ago
1
$begingroup$
A BQ2002 is a Fast-Change Management IC. It doesn't itself pass the charge current - it just controls some external component(s).
$endgroup$
– brhans
5 hours ago
$begingroup$
Read around P 18 of 93. This Power IC selection guide has all types of battery chargers not just the ones in these answers ti.com/lit/pdf/slvt145 BQ2002 is current limited to 2C and others are pulse, linear etc
$endgroup$
– Sunnyskyguy EE75
5 hours ago