参数资料
| 型号： | SC824ULTRT |
| 厂商： | Semtech |
| 文件页数： | 14/29页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC824ULDKR |
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SC824
Applications Information (continued)
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R IPRGM (k Ω ), R-tol = 1%
Figure 2a — Pre-charge Current and USB Low Power
Mode Fast-charge Current Tolerance vs. Programming
Resistance, Low Resistance Range
Termination
When the battery voltage reaches V CV , the SC824 transi-
tions from constant current regulation to constant voltage
regulation. The current into the battery decreases while
the BAT voltage is regulated to V CV as the battery becomes
fully charged. When the output current drops below the
termination current threshold, charging terminates. Upon
termination, the charger either enters monitor state or
float charges the battery for the top-off timer duration,
depending on the configuration of the charge timer. After
a 20 second delay following termination, the STAT1 pin
open drain output turns off.
The termination current threshold is fixed at 10% of the
fast-charge current, as programmed by the IPRGM pin
resistance to ground, for all charging modes.
Charger output current is the sum of the battery charge
current and the system load current. Battery charge
current changes gradually and establishes a slowly dimin-
ishing lower bound on the output current while charging
in CV regulation. The load current into a typical digital
R IPRGM (k Ω ), R-tol = 1%
Figure 2b — Pre-charge Current and USB Low Power
Mode Fast-charge Current Tolerance vs. Programming
Resistance, High Resistance Range
low-load-current interval, and does not require that the
longer interval average load current be small.
Termination current threshold accuracy is dominated by
offset error. The range of expected termination current
versus programming resistance R IPRGM (for any charging
mode) is shown in Figures 3a and 3b. Each figure shows
the nominal termination current versus nominal R IPRGM
resistance as the center plot and two theoretical limit
plots indicating maximum and minimum current vs.
nominal programming resistance. These plots are derived
from models of the expected worst-case contribution of
error sources depending on programmed current. The
current range includes the uncertainty due to a 1% toler-
ance resistor. The dots on each plot indicate the currents
obtained with EIA E96 standard value 1% tolerance resis-
tors. Figures 3a and 3b show low and high resistance
ranges, respectively.
Monitoring Output Current
The output current I BAT is indicated by the voltage at the
IPRGM pin according to the following equation.
system is highly transient in nature. Charge cycle termina-
tion is detected when the sum of the battery charging
current and the greatest load current occurring within the
I BAT
V IPRGM
R IPRGM
1000
immediate 300μs to 550μs past interval is less than the
programmed termination current. This timing behavior
permits charge cycle termination to occur during a brief
Ensure that the IPRGM pin is not loaded or corrupted by
the processor Analog to Digital Converter (ADC). An RC
14
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