 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
MAX6458UKD3C-T Datasheet(PDF) 10 Page - Maxim Integrated Products |
|
||||||||||||||||||||||||||||||
MAX6458UKD3C-T Datasheet(HTML) 10 Page - Maxim Integrated Products |
|
|
10 / 15 page  MAX6457–MAX6460 High-Voltage, Low-Current Voltage Monitors in SOT Packages 10 Maxim Integrated Applications Information Undervoltage Lockout Figure 8 shows the typical application circuit for detecting an undervoltage event of a 5-cell Li+ battery stack. Connect OUT of the MAX6457/MAX6458/MAX6460 (OUTA of the MAX6459) to the shutdown input of the DC- DC converter to cut off power to the load in case of an undervoltage event. Select R1 and R2 to set the trip volt- age (see the Programming the Trip Voltage (VTRIP) sec- tion). When the voltage of the battery stack decreases so that VIN+ drops below VTH- of the MAX6457–MAX6460, then OUT (OUTA) goes low and disables the power sup- ply to the load. When the battery charger restores the volt- age of the 5-cell stack so that VIN+ > VTH+, OUT (OUTA) goes high and the power supply resumes driving the load. Overvoltage Shutdown The MAX6457–MAX6460 are ideal for overvoltage shut- down applications. Figure 9 shows a typical circuit for this application using a pass P-channel MOSFET. The MAX6457–MAX6460 are powered directly from the sys- tem voltage supply. Select R1 and R2 to set the trip volt- age (see the Programming the Trip Voltage (VTRIP) section). When the supply voltage remains below the selected threshold, a low logic level on OUT (OUTB for MAX6459) turns on the p-channel MOSFET. In the case of an overvoltage event, OUT (OUTB) asserts high, turns off the MOSFET, and shuts down the power to the load. Figure 10 shows a similar application using a fuse and a silicon-controlled rectifier (SCR). An overvoltage event turns on the SCR and shorts the supply to ground. The surge of current through the short circuit blows the fuse and terminates the current to the load. Select R3 so that the gate of the SCR is properly biased when OUT (OUTB) goes high impedance. Window Detection The MAX6458/MAX6459 include undervoltage and overvoltage comparators for window detection (Figures 2 and 3). The circuit in Figure 11 shows the typical con- figuration for this application. For the MAX6458, OUT asserts high when VCC is within the selected “window.” When VCC falls below the lower limit of the window (VTRIPLOW) or exceeds the upper limit (VTRIPHIGH), OUT asserts low. The MAX6459 features two independent open-drain outputs: OUTA (for undervoltage events) and OUTB (for overvoltage events). When VCC is within the selected window, OUTA and OUTB assert high. When VCC falls below VTRIPLOW, OUTA asserts low while OUTB LOAD R1 100k Ω 1 µF R2 RPULLUP VCC GND IN+ OUT (OUTA FOR MAX6459) MAX6457– MAX6460 VSUPPLY CLEAR Figure 9. Overvoltage Shutdown Circuit (with External Pass MOSFET) LOAD R1 R3 R2 VCC FUSE GND IN+ OUT (OUTA FOR MAX6459) MAX6457– MAX6460 VSUPPLY SCR Figure 10. Overvoltage Shutdown Circuit (with SCR Fuse) VCC VCC VCC GND VCC R1 R2 R3 MAX6458 MAX6459 IN+ IN- OUT OUT MAX6458 ONLY OUTB MAX6459 ONLY RPULLUP RPULLUP RPULLUP OUTA OUTA OUTB Figure 11. Window Detection |
Similar Part No. - MAX6458UKD3C-T |
|
Similar Description - MAX6458UKD3C-T |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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
