• BQ21040: Using a 100k NTC instead of the recommended 10k NTC

  

  Darin Shaw

  TI Thinks Resolved

  Part Number: BQ21040 On a new design, I am looking to use the BQ21040 battery charger. This is a part my company has used on a lot of designs. The attraction to it is cost and the ability to run stand-alone. The catch on this new design is that the Single…

  • over 2 years ago
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Answered

• BQ21040: VIN-DPM lower current limit

  

  Jomon

  Resolved

  Part Number: BQ21040 BQ21040 has Vin-DPM voltage set at 4.3V. Consider the BQ21040 charging the battery from a common rail, which is also connected to other devices. The input can only source 500mA and the other device connected to the rail is taking…

  • Resolved

  • over 2 years ago
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Answered

• BQ21040: Re-charge After a Pre-Charge Timeout

  

  Froylan Aguirre

  Resolved

  Part Number: BQ21040 The datasheet states that if the battery voltage drops below Vrch (nominally 4.105V), then a new charge cycle is initiated even after the 10-hour timer has timed-out. The datasheet also states if a discharged battery fails to reach…

  • Resolved

  • over 2 years ago
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• BQ21040: spice model

  

  Kazuhiko Hirano

  Part Number: BQ21040 Hello, Dose TI have any SPICE model for BQ21040 Best regards, K.Hirano

  • over 3 years ago
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• BQ21040: BQ21040 charge status

  

  Manish Mistry

  TI Thinks Resolved

  Part Number: BQ21040 Hi, I have connected Battery charger CHG pin directly to the controller. After full charge or no battery, I am getting Low on CHG pin. No any change on CHG pin. Please see the image below for schematic. Regards, Manish Mistry

  • over 3 years ago
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• BQ21040: 3.7V Battery Charger

  

  Idan Amsalem

  TI Thinks Resolved

  Part Number: BQ21040 Other Parts Discussed in Thread: BQ25171-Q1 , BQ25170 Hello, I've a custom board with BQ21040 charger and I'm looking for to charge a Lipo battery with the following parameters: 1. Voltage: 3.7V 2. Capacity: 60mAh 3. Shape…

  • over 3 years ago
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• BQ21040: Battery Charger and CC1352R Battery Monitoring

  

  Mehmet_Akif Ceylan

  Part Number: BQ21040 Hi I am designing kind of a ZigBee button that would be powered by single coin cell. For battery level monitoring I want to use MCU internal temperature and battery monitor functions. But also I will be charging the battery by BQ21040…

  • over 3 years ago
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• BQ21040: Output voltage when no battery

  

  George Zhao

  TI Thinks Resolved

  Part Number: BQ21040 Hi team, Just to confirm, when the battery is absent, the charger shall also regulate the output voltage to 4.2V right? And it should also OK to power loads? Thanks!

  • over 3 years ago
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Answered

• BQ21040: BQ21040 cannot charge Lithium Polymer with Protection Circuit

  

  Leo Marrero89

  Resolved

  Part Number: BQ21040 Hi, We are using the BQ21040 with a Lithium Polymer cell that has a protection circuit already installed. I am currently testing performance at low voltage situations. Battery and charging circuit is connected to a constant 20mA load…

  • Resolved

  • over 4 years ago
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• BQ21040: Battery Charger using TL751M-Q1 & BQ21040

  

  ANBUMANI NK

  Part Number: BQ21040 Dear Team, I am trying to build a GPS device with battery backup for cars My charger IC BQ21040, powered via LDO TL751M (input 12v and output 5v) .Battery size 150mah. Every thing works fine but the LDO is getting heated up to 50…

  • over 4 years ago
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