Is this the holy grail and answer to all my problems?

[punchy187]

LTC4365 - UV, OV and Reverse Supply Protection Controller

Features

• Wide Operating Voltage Range: 2.5V to 34V
• Overvoltage Protection to 60V
• Reverse Supply Protection to –40V
• Blocks 50Hz and 60Hz AC Power
• No Input Capacitor or TVS Required for Most Applications
• Adjustable Undervoltage and Overvoltage Protection Range
• Charge Pump Enhances External N-Channel MOSFET
• Low Operating Current: 125μA
• Low Shutdown Current: 10μA
• Fault Status Output
• Compact 8-Lead, 3mm × 2mm DFN and TSOT-23 (ThinSOT™) Packages

Typical Application

Description

The LTC4365 protects applications where power supply input voltages may be too high, too low or even negative. It does this by controlling the gate voltages of a pair of external N-channel MOSFETs to ensure that the output stays within a safe operating range.
The LTC4365 can withstand voltages between –40V and 60V and has an operating range of 2.5V to 34V, while consuming only 125μA in normal operation.
Two comparator inputs allow configuration of the overvoltage (OV) and undervoltage (UV) set points using an external resistive divider. A shutdown pin provides external control for enabling and disabling the MOSFETs as well as placing the device in a low current shutdown state. A fault output provides status of the gate pin pulling low. A fault is indicated when the part is in shutdown or the input voltage is outside the UV and OV set points.

Information borrowed from LTC4365 - UV, OV and Reverse Supply Protection Controller - Linear Technology

 

[Java_Az]

Well it is going to be pretty hard to drink wine out of , so very doubtful it is the holy grail. You never posted your problems but for protection this is going to be a expensive option. The chip by itself is almost 4 bucks then you need to add to n channel mosfets at almost 2 bucks a piece. resistors wont cost much but then you have to design and make a PCB board to solder it all too. Adding a PTC device would be much cheaper and smaller a solution to protect against over current situations. A protected battery already does over current /amps protection. So adding should be more then enough protection.

 

[punchy187]

Well it is going to be pretty hard to drink wine out of , so very doubtful it is the holy grail. You never posted your problems but for protection this is going to be a expensive option. The chip by itself is almost 4 bucks then you need to add to n channel mosfets at almost 2 bucks a piece. resistors wont cost much but then you have to design and make a PCB board to solder it all too. Adding a PTC device would be much cheaper and smaller a solution to protect against over current situations. A protected battery already does over current /amps protection. So adding should be more then enough protection.

Check the link out at the bottom of the original post. I was under the impression that I could purchase all the things you said all in this piece for around 4 dollars. I could be wrong though. What I am trying to accomplish is using something that has all the possible protections needed to be able to use any pair of batteries I want in series for high voltage regardless of whether the battery is protected or not because it is difficult to find detailed data on any battery you buy and I don't know enough about batteries to be able to tell. Even the guys at the store at times don't know what batteries have what protection so instead of not knowing what batteries I have are protected and protected against what I wouldn't have to worry as much about it because everything I need would be in this chip.

 

[punchy187]

@ Java_Az

How about this one. Does it have everything protection wise to enable me to use any Li-ion battery whether it has internal protection or not to use in series for a high voltage mod safely?

 

[Java_Az]

Yeah that is a Protection circuit made for li ion batteries in series ( 7.4volts). It for sure could be wired into a mod. But it does require 3 connections from the batteries. Positive battery(+7.4volts) and negative battery( -7.4volts) and it requires a connection from where the two batteries (+/- 3.7volts) connect to each other that link them in series.

 

[punchy187]

Yeah that is a Protection circuit made for li ion batteries in series ( 7.4volts). It for sure could be wired into a mod. But it does require 3 connections from the batteries. Positive battery(+7.4volts) and negative battery( -7.4volts) and it requires a connection from where the two batteries (+/- 3.7volts) connect to each other that link them in series.

Cool. I requested a quote from the Tenergy web site because they don't list the price without asking for it I guess. I hope it isn't too much.

 

[Java_Az]

Cool. I requested a quote from the Tenergy web site because they don't list the price without asking for it I guess. I hope it isn't too much.

Here are a couple sites that sell them by the piece.I think you have to buy large quantities directly from Tenergy

All-Battery.com: PCB/PCM for 2S Li-ion & Li-Polymer Packs

Battery Management system

Protection Circuit Modules (PCB / PCM) For Lithium Ion Batteries

 

[punchy187]

Here are a couple sites that sell them by the piece.I think you have to buy large quantities directly from Tenergy

All-Battery.com: PCB/PCM for 2S Li-ion & Li-Polymer Packs

Battery Management system

Protection Circuit Modules (PCB / PCM) For Lithium Ion Batteries

Which amp limit should I use? I was thinking the 3.5 amp working (5 amp cutoff) would be the right one to use. What do you think?

 

[Java_Az]

Which amp limit should I use? I was thinking the 3.5 amp working (5 amp cutoff) would be the right one to use. What do you think?

That should work fine with 18650's that are of a quality brand.

 

[Digital-Dragon]

Which amp limit should I use? I was thinking the 3.5 amp working (5 amp cutoff) would be the right one to use. What do you think?

My project atm is different than the op's, in that I'm looking for the best protection pcb for use in a single unregulated 18650 2000mah aw imr mod.
I have found a few pcbs that look good as far as over-charge/over-discharge, but they have either 1A, 2A, or 3A current ratings... And I've read that the current rating for that batt is around 10A... So this one might be good? Charge/Discharge Protective Circuit Board for Rechargeable Li-Ion Batteries (17.4mm*1.9mm) - Free Shipping - DealExtreme but it doesn't list the over-charge/over-discharge volts, and it says it's for 3.6v cells...

The current rating is something that I don't quite understand yet... How important is it to have the pcb current rating exactly match that of the battery, and what happens if the pcb rating is lower or higher than the battery?

 

[Java_Az]

My project atm is different than the op's, in that I'm looking for the best protection pcb for use in a single unregulated 18650 2000mah aw imr mod.
I have found a few pcbs that look good as far as over-charge/over-discharge, but they have either 1A, 2A, or 3A current ratings... And I've read that the current rating for that batt is around 10A... So this one might be good? Charge/Discharge Protective Circuit Board for Rechargeable Li-Ion Batteries (17.4mm*1.9mm) - Free Shipping - DealExtreme but it doesn't list the over-charge/over-discharge volts, and it says it's for 3.6v cells...

The current rating is something that I don't quite understand yet... How important is it to have the pcb current rating exactly match that of the battery, and what happens if the pcb rating is lower or higher than the battery?

You dont want the protection to be the same or higher then the Max rated amps. Higher it is not protecting anything. If what you made requires 10 amps when in use you really need to look for a more powerful battery because you would be pushing it to it's limit all the time. If you going to run that battery by itself meaning no boost circuit the most amps it will use is 2.8 amps. Thats with the battery fully charged @ 4.2 volts using a LR atomizer 1.5 ohms. You want to give it a bit of room so it wont cut out on you when vaping. So 4 to 6 amp cut out would work great. IF you where slapping that battery with a boost circuit i would go with a 6 to 8 amp cut out PCB.

 

[Digital-Dragon]

You dont want the protection to be the same or higher then the Max rated amps. Higher it is not protecting anything. If what you made requires 10 amps when in use you really need to look for a more powerful battery because you would be pushing it to it's limit all the time. If you going to run that battery by itself meaning no boost circuit the most amps it will use is 2.8 amps. Thats with the battery fully charged @ 4.2 volts using a LR atomizer 1.5 ohms. You want to give it a bit of room so it wont cut out on you when vaping. So 4 to 6 amp cut out would work great. IF you where slapping that battery with a boost circuit i would go with a 6 to 8 amp cut out PCB.

Thanks. I get it now, I've just never seen it stated like that before. I'll let this thread get back to what the op intended now, didn't mean to hijack.