ISL9301 Intersil Corporation, ISL9301 Datasheet - Page 4

• Manufacturer Part Number: ISL9301
• Description: High Input Voltage Charger
• Manufacturer: Intersil Corporation

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Block Diagram
Pin Descriptions
VIN - Power input. The absolute maximum input voltage is
28V. A 10µF or larger value capacitor is recommended to be
placed very close to the input pin for decoupling purposes.
Additional capacitance may be required to provide a stable
input voltage.
VBAT - Charger output pin. Connect this pin to the battery. A
1µF or larger X5R ceramic capacitor is recommended for
decoupling and stability purposes. When the BATON pin is
pulled to logic LOW or left floating, the VBAT pin is
disconnected from the IC.
TIME - Timing resistor pin. The TIME pin determines the
oscillation period by connecting a timing resistor between
this pin and GND. The oscillator also provides a time
reference for the charger calculated in Equation 1.
Where R
by Equation 2:
Where t
timeout interval is approximately 5.6 hours.
t
t
TIMEOUT
OSC
=
OSC
75
TIME
=
×
R
2
---------------------------- -
TIME
IMIN
is in seconds. For an 1MΩ R
28
VIN
TIME
is in MΩ. The nominal timeout interval is given
3600
×
t
OSC
VCC
ILIM_REF
VOUT_REF
4
Die Temp
VOUT
142 oC
(
μs
)
(
Hour
TIME
1V
0.2V
)
COMP
COMP
, the nominal
S
R
(EQ. 1)
(EQ. 2)
Q
1000
1
VBAT
IBAT
CLK
IOUT
ISL9301
VIN
RILIM
SHUTDOWN
IBAT_REF
VBAT_REF
VBAT
Die Temp
POR
Timer
EOC
Re-charge
OVP
DispIay
Logic
115 oC
I
PPR - Open-drain power presence indication. The
open-drain MOSFET turns on when the input voltage is
above the POR threshold but below the OVP threshold and
off otherwise. This pin is capable to sink 10mA (minimum)
current to drive a LED. The maximum voltage rating for this
pin is 7V.
CHG - Open-drain charge indication pin. This pin outputs a
logic LOW when a charge cycle starts and turns to HIGH
when the end-of-charge (EOC) condition is qualified. This
pin is capable to sink 10mA min. current to drive an LED.
When the charger is disabled, the CHG outputs high
impedance.
IMIN - End-of-charge (EOC) current program pin. Connect a
resistor between this pin and the GND pin to set the EOC
current. The EOC current IMIN can be programmed by
Equation 3:
Where R
(or 10mA, whichever is higher) to 50% of IREF when
programmed to less than 5% or 10mA.
MIN
SHUTDOWN
=
----------------
R
3151
IBAT
IMIN
IMIN
PPM CTRL
is in kΩ. The programmable range covers 5%
IOUT
1000
1
GND
(
mA
VOUT
CHG
PPR
)
VBAT
IREF
To system load
Cell1
VBAT
To uP
February 25, 2008
FN6435.0
(EQ. 3)