ISL6253 Datasheet, PDF (9/22 Pages) Intersil Corporation – Highly Integrated Battery Charger for Notebook Computers

ISL6253
PHASE
The Phase connection pin connects to the high side
MOSFET source, output inductor, and low side MOSFET
drain.
CSOP/CSON
CSOP/CSON are the battery charging current sensing
positive/negative inputs. 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 are the AC adapter current sensing positive/
negative inputs. 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 0.1µF ceramic
capacitor.
ACSET
ACSET is an AC adapter detection input. Connect a resistor
divider to an AC adapter.
ACPRN
ACPRN is an AC adapter present open drain output.
ACPRN is active low when ACSET is higher than 1.26V; and
active high when ACSET is lower than 1.26V.
DCSET
DCSET is a lower voltage adapter detection input (like
aircraft power 15V). This allows power to the system, but
power is not used to charge the battery.
DCPRN
DCPRN is a DC adapter present open drain output. DCPRN
is active low when DCSET is higher than 1.26V; and active
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.
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 the IC analog
circuit. Connect a 1µF ceramic capacitor to ground.
VDDP
VDDP is the supply voltage for the 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. Connect a
ceramic capacitor to ground.
VCOMP
VCOMP is a voltage loop amplifier output. Connect a
ceramic capacitor in series with a resistor to ground.
CELLS
This pin is used to select the battery voltage. CELLS = VDD
for a 4S battery, CELLS = GND for a 3S battery pack, and
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 from VREF 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 = VREF for 100mV, CHLIM = Floating for 65mV;
CHLIM = GND for 30mV. Connect 3.3V for 127mV. Connect
a resistor divider to program the charge current limit
threshold between 30mV and 127mV.
ACLIM
ACLIM is the adapter current limit set pin. ACLIM = VREF for
103mV, ACLIM = Floating for 78mV, and ACLIM = GND for
53mV. Connect a resistor divider from VREF to program the
adapter current limit threshold between 53mV and 103mV.
VREF
VREF is a reference output pin. Do not connect a decoupling
capacitor.
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