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參數(shù)資料
| 型號： | SC805IMLTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Miniature Integrated High Current Lithium-Ion Battery Charger |
| 中文描述： | 微型集成高電流鋰離子電池充電器 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 294K |
| 代理商： | SC805IMLTRT |
6
2005 Semtech Corp.
www.semtech.com
SC805
POWER MANAGEMENT
Fast-Charge Mode (CC)
The fast-charge or CC mode is active when the battery
voltage is above 2.8V and less than the CV or final float
charge voltage of the battery. The fast-charge current
can be set to a maximum of 1.0A and is selected by the
program resistor on the IPRGM pin. The voltage on this
pin will represent the current through the battery enabling
a microprocessor via an analog-to-digital converter (ADC)
to monitor battery current by sensing the voltage on the
IPRGM pin. The equation to set the fast-charge current
is given by:
1000
R
1.5
FCI
PRGM
=
Note that for a given program resistor the current through
the battery in CV mode can be determined by replacing
1.5 with the actual voltage on the IPRGM pin in the above
equation.
The superior fast-charge current accuracy of the SC805
is obtained by use of a patented* polarity-switched (i.e.,
chopped) current sense amplifier to nullify current mea-
surement offset errors.
Termination Current
Once the battery reaches the program voltage of 4.2V
the device will transition from a constant current source
to a constant voltage source and the current through
the battery begins to decrease while the voltage remains
constant. When the current falls below the programmed
termination current set by the termination resistor on
the ITERM pin, the SC805 will transition the CHRGB pin
from low to high. If the timer is enabled the output will
continue to float charge in CV mode until the timer ex-
pires. If the timer is disabled than the output will turn off
as soon as the termination current level is reached. If
the part is in LDO mode the SC805 will remain on indefi-
nitely at the regulated CV voltage. The equation to set
the termination current is given by:
Monitor Mode
When a charge cycle is completed, the SC805 output
turns off and the device enters monitor mode. If the
voltage of the battery falls below the recharge threshold
General Operation
The SC805 is configured based on the application for
Fast Charge and Termination current, timing require-
ments, and operation with and without a battery (LDO
mode). A typical charging cycle is described below. De-
tails on alternate applications and output programmabil-
ity are covered in the individual sections.
The charging cycle begins when the adapter is plugged
in. The SC805 performs glitch filtering on the VCC input
and initiates a charge cycle when VCC > UVLO. At this
time, the CHRGB signal is active low turning on the charg-
ing LED. If the battery voltage is less than 2.8V, the
SC805 will charge the output with the pre-charge cur-
rent. When the battery voltage exceeds 2.8V, the SC805
enters fast-charge or constant current (CC) mode. When
the battery voltage reaches its final value, the charger
enters the constant voltage (CV) mode. In this mode the
output current decreases as the battery continues to
charge until the termination current level is reached.
The CHRGB pin goes high when Iout is less than
Itermination turning off the ‘charging’ LED and turning
on the ‘charge complete’ LED. The SC805 continues to
hold the battery in CV charge mode until the timer ex-
pires. At this point the charger enters the monitor mode
where the output remains off until Vout drops by 100mV
and a new charge cycle is initiated.
Pre-Charge Mode
Pre-charge mode is automatically enabled whenever the
battery voltage is below 2.8V. It is used to limit the power
dissipation and precondition the battery for fast charg-
ing. The pre-charge current value is selected by the re-
sistor on the ITERM pin. The pre-charge current is pro-
grammable from 10mA to 125mA. The equation to se-
lect the pre-charge current is given by:
100
R
1.5
PCI
TERM
=
If the charge timer is in use there is also a maximum
allowed pre-charge duration. If the pre-charge time ex-
ceeds 1/4 of the total charge cycle the charger will turn
off due to a pre-charge fault. This fault is cleared when
EN or VCC is toggled or the output voltage rises above
2.8V.
Applications Information
100
R
1.5
ITERM
TERM
=
*US Patent 6,836,095
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