 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
BQ25122 Datasheet(PDF) 48 Page - Texas Instruments |
|
|
||||||||||||||||||||||||||||||
BQ25122 Datasheet(HTML) 48 Page - Texas Instruments |
|
|
48 / 70 page  48 bq25122 SLUSD33 – NOVEMBER 2017 www.ti.com Product Folder Links: bq25122 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Typical Application (continued) 9.2.1 Design Requirements This application is for a low power system that has varying loads from less than 10 mA up to 300 mA. It must work with a valid adaptor or USB power input. Below are some of the key components that are needed in normal operation. For this example, the fast charge current is 50 mA, input current limit is 400 mA and the pre-charge and termination current is 10% of the fast charge current. • Supply voltage = 3.4 V to 20 V • Fast charge current is default to 10 mA with ISET pin shorted to ground. To program the fast charge current, connect an external resistor from ISET to ground. • Input current limit is default to 100 mA with ILIM pin shorted to ground. To program the input current limit, connect an external resistor from ILIM to ground. • Termination current threshold is default to 2 mA with IPRETERM pin shorted to ground. To program the input current limit, connect an external resistor from IPRETERM to ground. • A 2.2-µH inductor is needed between SW pin and SYS pin for PWM output. • TS- Battery temperature sense needs a NTC connected on TS pin. 9.2.2 Detailed Design Procedure See Figure 37 for an example of the application diagram. 9.2.2.1 Default Settings • Connect ISET, ILIM and IPRETERM pins to ground to program fast charge current to 10mA, input current limit to 100mA and pre-charge/termination current to 2 mA. • BAT_UVLO = 3 V • VSYS = 1.8 V • LS/LDO is LS • VBREG = 4.2 V • VIN_DPM is enabled and VIN_DPM Threshold = 4.6 V. • Safety Timer = 3 hr • If the function is not needed, connect TS to the center tab of the resistor divider between VIN and the ground. (pull up resistor = 14 kΩ, pull down resistor = 14.3 kΩ) 9.2.2.2 Choose the Correct Inductance and Capacitance Refer to the Buck (PWM) Output section for the detailed procedure to determine the optimal inductance and capacitance for the buck output. 9.2.2.3 Calculations 9.2.2.3.1 Program the Fast Charge Current (ISET) RISET = KISET/ICHG (10) KISET = 200 AΩ from the Specifications table RISET = 200 AΩ / 0.05A = 4 kΩ (11) Select the closest standard value, which in this case is 4.99 k Ω. Connect this resistor between ISET pin and GND. 9.2.2.3.2 Program the Input Current Limit (ILIM) RILIM = KILIM/II_MAX (12) KILIM = 200 AΩ from the Specifications table RILIM = 200 AΩ / 0.4A = 500 Ω (13) Select the closest standard value, which in this case is 499 Ω. Connect this resistor between ILIM pin and GND. |
Similar Part No. - BQ25122 |
|
Similar Description - BQ25122 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
