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LP28301 датащи(PDF) 8 Page - Lowpower Semiconductor inc

номер детали LP28301
подробное описание детали  2A Synchronous Buck Li-ion Charger
PDF  9 Pages
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производитель  POWER [Lowpower Semiconductor inc]
домашняя страница  http://www.lowpowersemi.com
Logo POWER - Lowpower Semiconductor inc

LP28301 датащи(HTML) 8 Page - Lowpower Semiconductor inc

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LP28301-02
Mar.-2017
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 8 of 9
Preliminary Datasheet
LP28301
Battery Charging Profile
The device charges the battery in three phases:
preconditioning, constant current and constant
voltage. At the beginning of a charging cycle, the
device checks the battery voltage and applies
current.
Battery Temperature Detection
The
LP28301
continuously
monitors
battery
temperature by measuring the voltage between the
NTC pins and ground, typically determined by a
negative temperature coefficient thermistor and an
external voltage divider. The device compares this
voltage against its internal thresholds to determine if
charging is allowed. To initiate a charge cycle, the
battery temperature must be within the VLTF to VHTF
thresholds. There is a constant current source in
NTC which is 100µA(INTC) flowing out form this pin.
So VNTC is INTC×RNTC.
When the NTC fault occurs, the STAT pin will blink to
indicate the fault.
ISET ramming Charge Current
The charge current is RISET rammed using a single
resistor from the ISET pin to ground. The battery
charge current is 1000 times the current out of the
ISET pin. The RISET ram resistor and the charge
current are calculated using the following equations:
)
(
1.5
1000
)
(
ISET
CHG
R
V
A
I
Note: VISET is 1.5Volts when VBAT>VTRIKL.



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