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ISL6257 View Datasheet(PDF) - Intersil

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ISL6257 Datasheet PDF : 22 Pages
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ISL6257
FB
The negative feedback of the voltage amplifier which sets
the output voltage at CSON. An internal resistor divider from
CSON adjusts the voltage feedback signal in the ratio of 6:1
for CELLS = GND, 8:1 for CELLS = VDD and 4:1 for
CELLS = float.
PGND
PGND is the power ground. Connect PGND to the source of
the low-side MOSFET.
VDD
VDD is an internal LDO output to supply IC analog circuit.
Connect a 1μF ceramic capacitor to ground.
VDDP
VDDP is the supply voltage for the low-side MOSFET gate
driver. Connect a 4.7Ω 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% per cell; VADJ = Floating for 4.2V per cell;
VADJ = GND for 4.2V - 5% per 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.
9
FN9288.2
January 17, 2007
 

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