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ISL6257 Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL6257 Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 22 page  8 FN9288.2 January 17, 2007 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 in non Narrow VDC systems. 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. In Narrow VDC systems BGATE should be unconnected. 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. DCIN The DCIN pin is the input of the internal 5V LDO. Connect it to the AC adapter output. Connect a 0.1µF ceramic capacitor from DCIN to CSON. ACSET ACSET is an AC adapter detection input. Connect to a resistor divider from the AC adapter output. ACPRN Open-drain output signals AC adapter is present. ACPRN pulls low when ACSET is higher than 1.26V and pulled high when ACSET is lower than 1.26V. DCSET DCSET is a lower voltage adapter detection input (like aircraft power 15V). Allows the adapter to power the system where battery charging has been disabled. DCPRN Open-drain output signals DC adapter is present. DCPRN pulls low when DCSET is higher than 1.26V and pulled high when DCSET is lower than 1.26V. EN EN is the Charge Enable input. Connecting EN to high enables the charge control function; connecting EN to low disables charging functions. Use with a thermistor to detect a hot battery and suspend charging. FIGURE 17. LINE AND LOAD REGULATION IN NVDC MODE FIGURE 18. LINE AND LOAD REGULATION IN NVDC MODE AS A PERCENTAGE OF NO LOAD VOLTAGE Typical Operating Performance DCIN = 20V, 4S2P Li-Battery, TA = +25°C, unless otherwise noted. (Continued) Line and Load Regulation 0 2 4 6 8 10 12 14 16 18 02 46 8 10 12 System Load Current (Amps) 10Vin-8.4Vout 15Vin-8.4Vout 20Vin-8.4Vout 25Vin-8.4Vout 15Vin-12.6Vout 20Vin-12.6Vout 25Vin-12.6Vout 20Vin-16.8Vout 25Vin-16.8Vout Adapter Current Limit Mode Line and Load Regulation (%) -0.6% -0.4% -0.2% 0.0% 0.2% 0.4% 0.6% 02 46 8 10 12 System Load Current (Amps) 10Vin-8.4Vout 15Vin-8.4Vout 20Vin-8.4Vout 25Vin-8.4Vout 15Vin-12.6Vout 20Vin-12.6Vout 25Vin-12.6Vout 20Vin-16.8Vout 25Vin-16.8Vout upper limit lowerlimit Adapter Current Limit Mode ISL6257 |
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