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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)： | 9/17頁 |
| 文件大?。?/td> | 566K |
| 代理商： | SC805AMLTRT |
2007 Semtech Corp.
www.semtech.com
SC805A
9
POWER MANAGEMENT
Monitor Mode
When a charge cycle is completed, the SC805A output
turns off and the device enters monitor mode. If the
voltage of the battery falls below the recharge threshold
of CV-00mV the charger will clear the charge timer and
re-initiate a charge cycle. The maximum current drain of
the battery during monitor mode will be no more than μA
over temperature. The status of the charger output as a
function of RTIME, and VOUT current is shown below.
Output
State
Rtime
Timer
VOUT current
ON
ON
OFF
ON
OFF
VCC
R
R
Low
Low
N/A
N/A
N/A
N/A
T < Timer
T > Timer
Disabled
Disabled
> termination
< termination
Charge Timer
The timer on the SC805A is used as protection in the case
of a faulty battery and to maximize charging capacity. Con-
nect a resistor from the RTIME pin to GND to select the
desired charge time duration according to the following
equation.
2.5HRS
39.2k
R
TIME
CHARGE
TIME
x
1
·
¨
§
The timer is programmable over the range of to 0 hours.
To disable the charge timer, connect RTIME to GND. Driving
the RTIME pin to VCC will disable the timer and select LDO-
mode operation for the SC805A. One implementation of
this feature is discussed in the NOBAT operating section.
The SC805A will automatically turn off the output when
the charge timer times out.
NOBAT Output
The SC805A detects the absence of the battery by monitor-
ing the voltage on the NTC pin. When the NTC pin voltage
exceeds 95% of VCC, the NOBAT output is driven high. This
function utilizes the standard NTC configuration with the
NTC component residing in the battery pack. When the
battery is removed the NTC element in the resistor divider
is missing and the NTC voltage is pulled up to VCC.
The NOBAT output can be used to signal the system that
the battery has been removed, drive an external LED, or
fed back to the SC805A to select LDO-mode.
Connect the NOBAT pin to the RTIME pin to select LDO
mode when the battery is removed and re-enable the
output of the SC805A.
LDO Mode
The SC805A is designed to work with or without a battery. If
the battery is not in place the device can enter LDO mode. In
this mode the SC805A will act like a low dropout regulator.
The input pin RTIME is used to select LDO mode. If RTIME
is high the device will be in LDO mode. When LDO mode is
selected and the EN-NTC pin is greater than 90% of VCC
the output will be on in LDO mode. During LDO mode the
device will regulate the output voltage with a current limit
set by the resistor tied to the IPRGM pin.
EN-NTC Interface
The enable pin on the SC805A provides three functions:
device disable, battery detection, and NTC temperature
protection. It can be used to turn off the device by driving
the pin to GND. It can also be connected to an external
resistor divider consisting of a resistor and an NTC Thermis-
tor to disable the charge cycle when the temperature is out
of range. If the pin is pulled to VCC the SC805A will signal
a ‘No Battery’ condition on the NOBAT pin.
Note: the SC805A will be disabled due to the NTC function
when the ‘No Battery’ condition is detected due to the NTC
feature. The NTC temperature fault can be overridden to
re-enable the output of the charger for no battery conditions
as described in the NOBAT section of the datasheet.
The NTC external component configuration is shown in the
typical application schematic on Page of the datasheet.
When the NTC voltage from the divider is above or below the
cold and hot temperature threshold values, the SC805A
will suspend the charge cycle by turning off the output,
freezing the charge timer, and indicating a fault on the
CHRGB LED. Hysteresis is included for both hot and cold
thresholds to avoid chatter at the NTC trip points. When
the temperature returns to the valid range, the SC805A will
automatically resume the charge cycle. The charge timer
will time-out when the SC805A output on-time exceeds the
timer setting regardless of how long it has been disabled
Applications Information (Cont.)
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