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MAX712EPE Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX712EPE Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 18 page NiCd/NiMH Battery Fast-Charge Controllers _______________________________________________________________________________________ 5 ______________________________________________________________Pin Description Compensation input for constant current regulation loop CC 11 Negative terminal of battery BATT- 12 System ground. The resistor placed between BATT- and GND monitors the current into the battery. GND 13 Current sink for driving the external PNP current source DRV 14 Shunt regulator. The voltage on V+ is regulated to +5V with respect to BATT-, and the shunt current powers the MAX712/MAX713. V+ 15 Trip point for the under-temperature comparator. If the MAX712/MAX713 power on with the voltage-on TEMP less than TLO, fast charge is inhibited and will not start until TEMP rises above TLO. TLO 6 Sense input for temperature-dependent voltage from thermistors. TEMP 7 Open-drain, fast-charge status output. While the MAX712/MAX713 fast charge the battery, FASTCHG sinks current. When charge ends and trickle charge begins, FASTCHG stops sinking current. FASTCHG 8 PGM2 and PGM3 set the maximum time allowed for fast charging. Timeouts from 33 minutes to 264 minutes can be set by connecting to any of V+, REF, or BATT-, or by leaving the pin open (Table 3). PGM3 also sets the fast-charge to trickle-charge current ratio (Table 5). PGM2, PGM3 9, 10 Trip point for the over-temperature comparator. If the voltage-on TEMP rises above THI, fast charge ends. THI 5 PGM0 and PGM1 set the number of series cells to be charged. The number of cells can be set from 1 to 16 by connecting PGM0 and PGM1 to any of V+, REF, or BATT-, or by leaving the pin open (Table 2). For cell counts greater than 11, see the Linear-Mode, High Series Cell Count section. Charging more or fewer cells than the number programmed may inhibit ∆V fast-charge termination. PGM0, PGM1 3, 4 PIN Positive terminal of battery BATT+ 2 Sets the maximum cell voltage. The battery terminal voltage (BATT+ - BATT-) will not exceed VLIMIT x (number of cells). Do not allow VLIMIT to exceed 2.5V. Tie VLIMIT to VREF for normal operation. VLIMIT 1 FUNCTION NAME 2V reference output REF 16 |
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