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ISL6251AHRZ Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL6251AHRZ Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 20 page  8 FN9202.1 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. 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 DCIN to a 0.1 µF ceramic capacitor. ACSET ACSET is an AC adapter detection input. Connect to a resistor divider from the adapter input. ACPRN ACPRN is an AC adapter present open drain output. ACPRN is active low when ACSET is higher than typically 1.26V, and active high when ACSET is lower than typically 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. ICM ICM is the adapter current output. The output of this pin produces a voltage proportional to the adapter current. PGND PGND is the power ground. Connect PGND to the source of the low side MOSFET for the low side MOSFET gate driver. VDD VDD is an internal LDO output to supply IC analog circuit. Connect a 1 µF ceramic capacitor to ground. VDDP VDDP is the supply voltage for the low-side MOSFET gate driver. Connect a 4.7 Ω resistor to VDD and a 1µF ceramic capacitor to power ground. ICOMP ICOMP is a current loop error amplifier output. VCOMP VCOMP is a voltage loop amplifier output. CELLS This pin is used to select the battery voltage. CELLS=VDD for a 4S battery pack, CELLS=GND for a 3S battery pack, CELLS=Float for a 2S battery pack. VADJ VADJ adjusts battery regulation voltage. VADJ=VREF for 4.2V+5%/cell; VADJ=Floating for 4.2V/cell; VADJ=GND for 4.2V-5%/cell. Connect to a resistor divider to program the desired battery cell voltage between 4.2V-5% and 4.2V+5%. CHLIM CHLIM is the battery charge current limit set pin. CHLIM input voltage range is 0.1V to 3.6V. When CHLIM=3.3V, the set point for CSOP-CSON is 165mV. The charger shuts down if CHLIM is forced below 88mV. ACLIM ACLIM is the adapter current limit set pin. ACLIM=VREF for 100mV, ACLIM=Floating for 75mV, and ACLIM=GND for 50mV. Connect a resistor divider to program the adapter current limit threshold between 50mV and 100mV. VREF VREF is a 2.39V reference output pin. It is internally compensated. Do not connect a decoupling capacitor. ISL6251, ISL6251A |
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