參數(shù)資料
型號: ISL6251AHAZ
廠商: INTERSIL CORP
元件分類: 電源管理
英文描述: Low Cost Multi-Chemistry Battery Charger Controller
中文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
封裝: LEAD FREE, 3 X 3 MM, PLASTIC, QSOP-24
文件頁數(shù): 8/20頁
文件大小: 593K
代理商: ISL6251AHAZ
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
μ
F 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
μ
F ceramic capacitor to ground.
VDDP
VDDP is the supply voltage for the low-side MOSFET gate
driver. Connect a 4.7
resistor to VDD and a 1
μ
F 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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