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參數(shù)資料
| 型號： | SC805AMLTRT |
| 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)： | 8/17頁 |
| 文件大?。?/td> | 566K |
| 代理商： | SC805AMLTRT |
8
2007 Semtech Corp.
SC805A
www.semtech.com
POWER MANAGEMENT
General Operation
The SC805A is configured based on the application for fast-
charge and termination current, timing requirements, and
operation with and without a battery (LDO mode). A typical
charging cycle is described below. Details on alternate ap-
plications and output programmability are covered in the
individual sections.
The charging cycle begins when the adapter is plugged in.
The SC805A 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 charging LED. If
the battery voltage is less than 2.8V, the SC805A will charge
the output with the pre-charge current. When the battery
voltage exceeds 2.8V, the SC805A enters fast-charge or
constant current (CC) mode. When the battery voltage
reaches its final value, the charger enters the constant volt
-
age (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 VOUT output current is less
than the programmed termination current, turning off the
‘charging’ LED and turning on the ‘charge complete’ LED.
The SC805A continues to hold the battery in CV charge
mode until the timer expires. At this point the charger
enters the monitor mode where the output remains off
until VOUT drops by 00mV 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 charging.
The pre-charge current value is selected by the resistor on
the ITERM pin. The pre-charge current is programmable
from 0mA to 25mA. The equation to select the pre-
charge current is given by:
100
R
1.5
PCI
TERM
x
1
·
¨
§
If the charge timer is in use there is also a maximum al-
lowed pre-charge duration. If the pre-charge time exceeds
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.
Fast-Charge Mode (CC)
The fast-charge or CC mode is active when the battery volt-
age 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 .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 equa-
tion to set the fast-charge current is given by:
Note that for a given program resistor the current through
the battery in CV mode can be determined by replacing
.5 with the actual voltage on the IPRGM pin in the above
equation.
The superior fast-charge current accuracy of the SC805A is
obtained by use of US patent 6,836,095 polarity-switched
(i.e., chopped) current sense amplifier to nullify current
measurement 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 SC805A 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 expires. 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 SC805A will remain on indefinitely at the
regulated CV voltage. The equation to set the termination
current is given by:
100
R
1.5
ITERM
TERM
x
1
·
¨
§
Applications Information
1000
R
1.5
FCI
PRGM
x
1
·
¨
§
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