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MAX1906VEGE Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1906VEGE Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 14 page Detailed Description The MAX1906 protects 2-, 3-, or 4-series Li+ battery packs from overcharge by controlling a three-terminal protection fuse. Figures 1 and 2 show two application circuits using the MAX1906. The MAX1906 checks the voltage of each cell at regular intervals. An overcharge condition is detected if any cell voltage exceeds the overvoltage threshold for more than 2.1s. The MAX1906 responds to an overcharge condition by turning on an internal SCR (Figure 1) or an external MOSFET (Figure 2) to blow a three-terminal protection fuse placed in series with the charging path. The MAX1906 checks for disconnected voltage sense pins every time it exits the standby mode or test mode. If a disconnected pin is detected, the DISCON pin is latched low. The MAX1906 also includes a test mode, which determines if the circuit is operating correctly while in an assembled battery pack. A pulse on the TEST pin enables the test mode. Figure 3 shows the cell connec- tions for 2- and 3-series battery packs and Figure 4 shows the functional diagram for the MAX1906. The MAX1906 can be used together with other resettable protection circuits to provide a high level of safety against overcharging Li+ batteries. Figure 5 shows a typical application circuit using the MAX1906 together with the MAX1924. The MAX1924 has a lower overvoltage threshold than the MAX1906. If any cell voltage exceeds 4.35V (typ), the MAX1924 turns off the TKO and CGO MOSFETs and opens the charging path. If the TKO or CGO MOSFET fails and charging continues, the MAX1906 blows the protection fuse and opens the charg- ing path permanently once any cell voltage reaches 4.45V (typ). The MAX1924 also protects the battery pack against undervoltage, charge current, discharge current, and pack-short fault conditions. Refer to the MAX1894/ MAX1924 data sheets for complete details. Li+ Battery-Pack Protector with Integrated Fuse Driver _______________________________________________________________________________________ 5 Pin Description PIN MAX1906S MAX1906V MAX1906X NAME DESCRIPTION 1, 9 1, 9 1, 9 I.C. Internal Connection. Float pins 1 and 9. 6, 11, 13, 15 6, 11, 13, 15 6, 11, 13, 15 N.C. No Connection 2 2 2 DRV MOSFET Driver Output. High when an overvoltage condition is detected. Connect the DRV pin to the gate of an external MOSFET to blow the protection fuse. 3 3 3 TEST Test-Mode Input. Test mode is enabled with a pulse of minimum 50µs duration on the TEST pin. 4 4 4 DISCON Disconnected Pin Output. This is an open-drain output and is high-Z during normal operation. If B4P, B3P, B2P, or B1P is disconnected, this pin is pulled low (see the Disconnected Pin Detection section). 5 5 5 PKN Pack Negative. A sense resistor may be connected between BN and PKN. 7 7 7 OUT Anode Output of the SCR. Connect OUT to the fuse’s heater connection (see the Protection Fuse Selection section). 88 8 BN Negative Terminal of Cell 1. Connect BN to the negative terminal of the first series Li+ cell. BN is also chip ground, which is connected to the backside paddle on the QFN package. 10 10 10 B1P Positive Terminal of Cell 1. Connect B1P to the positive terminal of the first series Li+ cell. 12 12 12 B2P Positive Terminal of Cell 2. Connect B2P to the positive terminal of the second series Li+ cell. — 14 14 B3P Positive Terminal of Cell 3. Connect B3P to the positive terminal of the third series Li+ cell. —— 16 B4P Positive Terminal of Cell 4. Connect B4P to the positive terminal of the fourth series Li+ cell. |
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