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MAX745C/D Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX745C/D Datasheet(HTML) 6 Page - Maxim Integrated Products |
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6 / 9 page  VREF / 2, the voltage limit is 4.2V. Table 1 defines the battery cell count. The battery limit voltage is set by the following: ( ) ADJ REF BATT REF 1 V V 2 V = cell count x V 9.523 − + Solving for VADJ, we get: BATT ADJ REF 9.523 V V = 9.023 V (Cell Count) − Set VADJ by choosing a value for R11 (typically 100kΩ), and determine R3 by: R3 = R11 x [(VREF / VADJ) - 1] (Figure 1) where VREF = 4.2V and cell count is 1, 2, 3, 4 (Table 1). The voltage-regulation loop is compensated at the CCV pin. Typically, a series-resistor-capacitor combination can be used to form a pole-zero doublet. The pole introduced rolls off the gain starting at low frequencies. The zero of the doublet provides sufficient AC gain at mid-frequencies. The output capacitor (C1) rolls off the mid-frequency gain to below unity. This guarantees stability before encoun- tering the zero introduced by the C1’s equivalent series resistance (ESR). The GMV amplifier’s output is internally clamped to between one-fourth and three-fourths of the voltage at REF. Current Control The charging current is set by a combination of the current-sense resistor value and the SETI pin voltage. The current-sense amplifier measures the voltage across the current-sense resistor, between CS and BATT. The current-sense amplifier’s gain is 6. The voltage on SETI is buffered and then divided by 4. This voltage is compared to the current-sense amplifier’s output. Therefore, full- scale current is accomplished by connecting SETI to REF. The full-scale charging current (IFS) is set by the following: IFS = 185mV / R1 (Figure 1) Figure 1. Standard Application Circuit Table 1. Cell-Count Programming Table CELL0 CELL1 CELL COUNT GND GND 1 VL GND 2 GND VL 3 VL VL 4 MAX745 Switch-Mode Lithium-Ion Battery-Charger www.maximintegrated.com Maxim Integrated │ 6 REF (UP TO 24V) VL DCIN VIN BST DHI DLO LX PGND CS BATT THM 1 VADJ SETI CCI C3 47nF R11 100kΩ 1% R3 100kΩ 1% R16 D2 C6 0.1µF C7 0.1µF M1A 1/2 IRF7303 M1B D6 MBRS 340T3 D1 MBRS 340T3 R1 0.2Ω C1 68µF L1 22µH 1/2 IRF7303 IN4148 R12 R15 10kΩ C4 0.1µF C5 4.7µF R2 C2, 0.1µF 10kΩ GND IBAT CCV MAX745 BATTERY THM/SHDN STATUS |
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