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MAX1924XEEE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1924XEEE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 16 page Advanced Li+ Battery-Pack Protectors 8 _______________________________________________________________________________________ the direction of current flow. To reverse the current flow, the charger has to be removed (Figure 5). The sustain- ing condition for the latch is a 100mV (max) voltage drop across SRC and B4P. Since the charge-current fault threshold between BN and PKN is also 100mV (typ), the RDS_ON of the overcharge protection MOSFET must be greater than the sense resistor in order to ensure a latched state. Discharge-Current Fault Protection The MAX1894/MAX1924 protect against excessive dis- charge-current by monitoring the voltage developed across RSENSE. If VRSENSE exceeds the discharge-cur- rent fault threshold (VOD_TH, typically 145mV) for more than 3ms, the discharge-current comparator is tripped, setting DSO, CGO, and TKO high. Discharge-current fault is latched and is not reset until the MAX1894/MAX1924 detect a reversal in the direc- tion of current flow. To reverse the current flow, a charger must be applied (Figure 6). Pack-Short Current Fault Protection The MAX1894/MAX1924 protect against a shorted pack by monitoring the voltage developed across RSENSE. If VRSENSE exceeds the pack-short threshold (VPS_TH, typically 405mV) for more than 450µs, the pack-short comparator is tripped, setting CGO, DSO, and TKO high. DSO 15 14 TKO 13 B4P 1 SRC 16 2 R4 51 Ω RTKO 510 Ω R3 1k Ω C4 1 µF C6 0.1 µF R5 10 Ω C3 0.1 µF C2 0.1 µF C1 0.1 µF R2 1k Ω R1 1k Ω VCC B3P 3 IC3 4 B2P 5 IC2 6 B1P 7 IC1 8 BN 9 PKN CGO MICRO- CONTROLLER 12 11 SHDN CTL 10 RSENSE 0.02 Ω PACK + PACK - OVERDISCHARGE PROTECTION OVERCHARGE PROTECTION D1 CMPSH-3 TRICKLE CHARGE MAX1894X MAX1924X C5 2.2 µF BN Figure 1. Typical Applications Circuit with Trickle Charge |
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