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bq24070

Forum Post: Re: problem with bq24070

Chris Glaser

For Stat1 to turn off and Stat2 to turn on (thus, indicating charge done), a charge termination has to be detected. A charge termination means the battery current has dropped to less than 1/10 of the fast charge rate. Thus, if a heavy enough load is connected directly across the battery, the current...

on Nov 17, 2009
Forum Post: Re: USing BQ24070 charger

Chris Glaser

Felipe is referring to this thread, http://e2e.ti.com/forums/t/12647.aspx If your battery is very low and needs pre-charge, then STAT1 and STAT2 will stay on. When a valid termination is detected, the charger shuts off charging. Please move to the battery chargers forum for further assistance.

on Nov 25, 2009
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Chris Glaser

MODE and ISET2 are digital inputs that are usually controlled by a micro-controller. They should be set either high or low (high for your application). A high could be the 3.3V provided by the IC or Vin if it does not go above 7V. Along with CE, they should not be powered from the output of the IC as...

on Jan 25, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Chris Glaser

It doesn't matter what the MODE and CE pins are at if there is no solarpower, as the battery will not charge without an input source. So, yes, driving them with your uC is ok. MODE is a digital input. The spec for the MODE pin is the spec for the trip points that determine if the pin is read as...

on Jan 26, 2010
Forum Post: Re: BQ24081 Charge Termination

Chris Glaser

If you have a load in parallel with the battery, then the IC will never terminate if the load always draws more current than the termination current. The IC is just looking at the total current it is supplying--with a full battery, this is your load current. If you would like to see termination with...

on Feb 1, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Chris Glaser

Yes, our series of TPS63xxx devices operate the same except for the output current. The package is also different on some of them. They were deigned specifically for your situation--a battery supplying a 3.3V rail. Thus, they will seamlessly switch between buck and boost mode. It depends on your specific...

on Feb 3, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

chethan kp

Hi, I want similar type of circuit which you had designed..ie I need to recharge a 3.3v lithium battery and run my system and source is solar panel(max o/p is 7v).. So i decided to use your circuit. I want to use Bq27040 connections like this ISET1-> solar output CE->solar o/p/ micro...

on Feb 22, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Chris Glaser

Yes, you can use the bq24070 to charge a battery and then use a switcher, such as the TPS63000, to generate 3.3V from the battery. The bq24070 has a pin (Vref) which is the output of a 3.3V regulator in the IC. This can be used as a 3.3V source up to 20 mA. I am not sure what you mean by using...

on Feb 22, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

chethan kp

Hi Chris, My question is. Pins CE,MODE,ISET2 are the inputs ,so Can a connect these pins to the output of solar panel(since my solar panel is 1 to 6v)..? or it should be controlled by microncontroler only..? and I'm using TPS63031 to generate 3.3 v ,is this ok..? thanks chethan

on Feb 23, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Chris Glaser

CE, MODE, and ISET2 can handle voltages up to 7V max. Be sure and examine the voltage threshold levels for these digital signals. CE and ISET2 require at least 1.4V to register a high, while MODE requires just above 1V. Tying them to VREF would also work. Yes, the TPS63031 is a great choice to generate...

on Feb 23, 2010
Forum Post: Re: Solar powered battery charger

chethan kp

Hi, I need to a select a solar panel to recharge the Li Ion Battery(1020mA 3.7V 3.8wh). To recharge this what should be the solar panel’s Voltage range ,current range and power range..? Generally how to select the solar panel..? Kindly suggest some solar panels also. Does TI support...

on Mar 5, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

chethan kp

Hi Chris, In BQ24070 I did not understand about Autonomous Power Source Selection (AC Adapter or BAT). Does it mean automatically it switchs from adapter to BAT when no input..? How it works..? Do we need to play with MODE to select this..? Regards Chethan

on Mar 19, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Chris Glaser

The IC will automatically keep the load powered if possible. The MODE pin simply selects a preference of using either USB or AC, if both are present. Pages 12 and 13 in the datasheet explain this.

on Mar 19, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

chethan kp

Hi Chris, Hi I have designed the charging ckt using BQ24070. My aim is to design the charging ckt to charge the battery Li-Ion 3.7v 1000mAh (using solar panel as the source input) and to provide 3.3v source (operates from 2.7 to 4v) to the system. Attached is the ckt design for the above functionality...

on Apr 8, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Chris Glaser

I would recommend buying the EVM for the bq24070 and the tps63030 and modifying those to your requirements. This would be much simpler, cheaper, and faster than making your own board and would also validate the circuit. A few things that I noticed on the schematic: As described earlier in this...

on Apr 8, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

chethan kp

Thanks Chris.. Already I have sent this for fabrication, so some how I have to make this work.. I hope other than the above changes there is no correction required for the ckt.. thanks chethan

on Apr 9, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Chris Glaser

On the TPS63031, I would recommend increasing the capacitor values, both input and output. Equation 6 in the datasheet requires an 11uF capacitor for stability. At 3.3V DC bias, your 5V 10uF will be more like 5uF or even less. I recommend using 2 x 10uF @ 6.3V for the output and 10uF @ 6.3V for the input...

on Apr 11, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

chethan kp

Hi chris, I just need information on some ICs, Which IC will be the better for the following specs. Input voltage is 9v(AC) and I need to recharge the battery of 7v and I should get the regulated output voltage of 6-7v. is there any series of BQ IC will do the above operation..? or Can I...

on Apr 12, 2010
Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

chethan kp

Hi, I need to rechrage the 7v li ion battery from the AC source (9v),.. and my other ckt needs regulated 6v. ie I need a IC which charges the 7v li ion battery and gives some 6-7 reglated voltage .. thanks chethan

on Apr 13, 2010
Forum Post: Re: backup battery

Chris Glaser

The bq24070 has power path management. This means it can charge the battery, while powering the system. When the input power is removed, it automatically switches over to the battery to keep the system powered. This charger can only be used with rechargeable lithium batteries. From the output of the...

on Apr 13, 2010
Forum Post: need a help about backup battery bq24070

lilly

Hello! I'm looking for some circuit to monitor the state of battery pack. Tried to search from product list, but it seems a bit to many products and i failed looking for the right one, maybe I was looking in a wrong place. I need a <500ma and 3.3V battery.when power is ON the battery should...

on Apr 21, 2010
Forum Post: Problem with re-charge circuitry..

chethan kp

I'm facing some problem with power managing part of my design. I'm using BQ24070 for recharging the 4.2 v li-ion battery(instead of waiting for battery to get recharged, here I wanted to check whether my system will work or not with BQ24070). The ckt is attached in this issue ( I have designed...

on May 10, 2010
Forum Post: Re: Problem with re-charge circuitry..

chethan kp

Hi, In continuation with previous post. I checked in other way also.. I just used voltage divider at the output of the BQ24070 to get 3V and given this to the system ,With this setup my system triggers fine.. from this its very sure that there is no problem at the BQ24070 only there is...

on May 11, 2010
Forum Post: Re: problem with bq24070

chethan kp

Chris, There is some problem with charging part of the BQ24070. To test the charging I have connected 5v, 1A Ac to Dc adopter as a source at the input of the bq24070 and I have connected drained 4.2v 1000mA li-ion battery at the BAT1,BAT2 (battery +) and ground (batter -). I had put for almost...

on May 14, 2010
Forum Post: Re: problem with bq24070

Chris Glaser

If there is 4.4V on the OUT pin, then the IC is working. A few comments on your schematic: Make sure you have a 10k resistor from TS to GND. The maximum value for C6 (Vref cap) is 1 uF. Reduce the capacitor to this value. I would also look at that voltage with a scope to make sure it is up and...

on May 14, 2010

Browse by Tags

Forum Post: Re: problem with bq24070

Forum Post: Re: USing BQ24070 charger

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: BQ24081 Charge Termination

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Solar powered battery charger

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: Using solar and Li-Ion/Li-Po battery as power source for system (0.5A normal, 2.5A peak)

Forum Post: Re: backup battery

Forum Post: need a help about backup battery bq24070

Forum Post: Problem with re-charge circuitry..

Forum Post: Re: Problem with re-charge circuitry..

Forum Post: Re: problem with bq24070

Forum Post: Re: problem with bq24070