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MAX1737EEI Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1737EEI Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 18 page Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller _______________________________________________________________________________________ 9 Detailed Description The MAX1737 includes all of the functions necessary to charge between one and four series Li+ battery cells. It includes a high-efficiency synchronous-rectified step- down DC-DC converter that controls charging voltage and current. It also includes input source-current limit- ing, battery temperature monitoring, battery undervolt- age precharging, battery fault indication, and a state machine with timers for charge termination. The DC-DC converter uses an external dual N-channel MOSFET as a switch and a synchronous rectifier to convert the input voltage to the charging current or volt- age. The typical application circuit is shown in Figure 1. Figure 2 shows a typical charging sequence and Figure 3 shows the block diagram. Charging current is set by the voltage at ISETOUT and the voltage across R18. The battery voltage is measured at the BATT pin. The battery regulation voltage is set to 4.2V per cell and can be adjusted ±5% by changing the voltage at the VADJ pin. By limiting the adjust range, the voltage 27 26 22 23 25 24 21 20 19 7 4 28 CSSP DCIN CSSN VLO BST DHI LX DLO PGND CS BATT THM REF ISETIN VL SHDN ISETOUT VADJ CELL GND CCV CCI CCS TIMER1 TIMER2 R12 Li+ BATTERY (1 TO 4 CELLS) L1 R18 22 µH FAULT FULLCHG FULL CHARGE FAST CHARGE FAULT FASTCHG C6 47nF C13 1nF C14 1nF 1nF C5 47nF C4 C3 1 µF C1 4.7 µF C18 22 µF C19 22 µF SYSTEM LOAD INPUT SUPPLY C2 0.1 µF C7 0.1 µF C8 0.1 µF R1 10k R8 D1 D3 D2 R9 0.1 µF 16 11 9 6 12 3 8 2 5 18 1 10 13 14 17 15 0.1 µF 0.1 µF C15 68 µF C9 0.1 µF C11 0.1 µF C10 0.1 µF MAX1737 + + THERMISTOR Figure 1. Typical Application Circuit |
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