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參數(shù)資料
| 型號(hào)： | SC805 |
| 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(yè)數(shù)： | 13/15頁(yè) |
| 文件大?。?/td> | 294K |
| 代理商： | SC805 |
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7
2005 Semtech Corp.
www.semtech.com
SC805
POWER MANAGEMENT
of CV-100mV 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
1A over temperature. The status of the charger output
as a function of RTime, and IOUT is shown below.
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Charge Timer
The timer on the SC805 is used as protection in the case
of a faulty battery and to maximize charging capacity.
Connect a resistor from the RTIME pin to GND to select
the desired charge time duration according to the follow-
ing equation.
The timer is programmable over the range of 1 to 10
hrs. 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 SC805. One imple-
mentation of this feature is discussed in the NOBAT op-
erating section.
The SC805 will automatically turn off the output when
the charge timer times out.
2.5hrs
39.2k
R
Time
Charge
TIME
=
NOBAT output
The SC805 detects the absence of the battery by moni-
toring 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 configura-
tion 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 SC805 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 SC805.
LDO Mode
The SC805 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 SC805 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 volt-
age with a current limit set by the resistor tied to the
IPRGM pin.
EN-NTC Interface
The Enable pin on the SC805 provides three functions;
device disable, battery detection, and NTC temperature
protection. It can be used to turn off the device by driv-
ing the pin to Ground. It can also be connected to an
external resistor divider consisting of a resistor and an
NTC Thermistor to disable the charge cycle when the tem-
perature is out of range. If the pin is pulled to VCC the
SC805 will signal a ‘No Battery’ condition on the NOBAT
pin. Note that the SC805 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.
Applications Information (Cont.)
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