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ISL6255HRZ-T Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL6255HRZ-T Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 22 page 8 FN9203.1 June 17, 2005 Functional Pin Descriptions BOOT Connect BOOT to a 0.1µF ceramic capacitor to 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 Battery 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 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 0V and VDDP. PHASE The Phase connection pin connects to the high side MOSFET source, output inductor, and low side MOSFET drain. CSOP/CSON CSOP/CSON is the battery charging current sensing positive/negative input. The differential voltage across CSOP and CSON is used to sense the battery charging current, and is compared with the charging current limit threshold to regulate the charging current. The CSON pin is also used as the battery feedback voltage to perform voltage regulation. CSIP/CSIN CSIP/CSIN is the AC adapter current sensing positive/negative input. The differential voltage across CSIP and CSIN is used to sense the AC adapter current, and is compared with the AC adapter current limit to regulate the AC adapter current. GND GND is an analog ground. FIGURE 11. SWITCHING WAVEFORMS AT DIODE EMULATION FIGURE 12. SWITCHING WAVEFORMS IN CC MODE FIGURE 13. TRICKLE TO FULL-SCALE CHARGING Typical Operating Performance DCIN=20V, 4S2P Li-Battery, TA=25°C, unless otherwise noted. (Continued) INDUCTOR CURRENT 2A/div BGATE-CSIP 2V/div SYSTEM BUS VOLTAGE 10V/div SGATE-CSIP 2V/div ADAPTER REMOVAL INDUCTOR CURRENT 2A/div BGATE-CSIP 2V/div SYSTEM BUS VOLTAGE 10V/div SGATE-CSIP 2V/div INDUCTOR CURRENT 2A/div BGATE-CSIP 2V/div SYSTEM BUS VOLTAGE 10V/div SGATE-CSIP 2V/div ADAPTER REMOVAL INDUCTOR CURRENT 2A/div SGATE-CSIP 2V/div SYSTEM BUS VOLTAGE 10V/div BGATE-CSIP 2V/div ADAPTER INSERTION INDUCTOR CURRENT 2A/div SGATE-CSIP 2V/div SYSTEM BUS VOLTAGE 10V/div BGATE-CSIP 2V/div INDUCTOR CURRENT 2A/div SGATE-CSIP 2V/div SYSTEM BUS VOLTAGE 10V/div BGATE-CSIP 2V/div ADAPTER INSERTION CHLIM 1V/div CHARGE CURRENT 1A/div ISL6255, ISL6255A |
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