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ISL6253HRZ Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL6253HRZ Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 22 page  8 Functional Pin Descriptions BOOT Connect BOOT to a 0.1µF ceramic capacitor to the PHASE pin and connect to the cathode of the bootstrap Schottky diode. UGATE UGATE is the high side MOSFET gate drive output. SGATE SGATE is the AC adapter power source select output. The SGATE pin drives an external P-MOSFET used to switch to AC adapter as the system power source. BGATE BGATE power source select output. This pin drives an external P-channel MOSFET used to switch the battery as the system power source. When the voltage at the CSON pin is higher than the AC adapter output voltage at DCIN, BGATE is driven to low and selects the battery as the power source. LGATE LGATE is the low side MOSFET gate drive output; swing between PGND and VDDP. FIGURE 13. SWITCHING WAVEFORMS AT CONSTANT CHARGE CURRENT MODE FIGURE 14. SWITCHING WAVEFORMS AT TRICKLE CHARGE MODE FIGURE 15. EFFICIENCY vs CHARGE CURRENT Typical Operating Performance (Continued) Circuit of Figure 18, VDCIN = 20V, 4S2P Li-Ion Battery, TA = 25°C, unless otherwise noted. UGATE LGATE t: 100ns/DIV VDCIN=20V VCSON=16.8V VDCIN = 20V VCSON = 16.8V UGATE LGATE PHASE 10V/DIV UGATE LGATE 2V/DIV 1µs/DIV PHASE 10V/DIV INDUCTOR CURRENT 0.5A/DIV CHARGE CURRENT 0.2A/DIV 0.76 0.8 0.84 0.88 0.92 0.96 1 0 0.5 1 1.5 2 2.5 3 3.5 4 CHARGE CURRENT (A) VCSON = 16.8V 4 CELLS VCSON = 12.6V 3 CELLS VCSON = 8.4V 2 CELLS ISL6253 |
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