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參數(shù)資料
| 型號： | LTC4011EFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 615 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大小： | 228K |
| 代理商： | LTC4011EFE#PBF |
20
LTC4011
4011p
APPLICATIO S I FOR ATIO
WU
UU
shutdown when the DC adapter is removed, minimizing
current draw from the battery in the absence of an input
power source.
While not a part of the sample waveforms of Figure 10,
temperature qualification is an ongoing part of the charg-
ing process, if an external thermistor network is detected
by the LTC4011. Should prescribed temperature limits be
exceeded during any particular charging state, charging
would be suspended until the sensed temperature re-
turned to an acceptable range.
Battery-Controlled Charging
Because of the programming arrangement of the LTC4011,
it may be possible to configure it for battery-controlled
charging. In this case, the battery pack is designed to pro-
vide customized information to an LTC4011-based charger,
allowing a single design to service a wide range of appli-
cation batteries. Assume the charger is designed to pro-
vide a maximum charge current of 800mA (RSENSE =
125m). Figure 11 shows a 5V NiCd battery pack for which
800mA represents a 0.75C rate. When connected to the
charger, this pack would provide battery temperature in-
formation and correctly configure both fast charge termi-
nation parameters and time limits for the internal NiCd cells.
A second possibility is to configure an LTC4011-based
charger to accept battery packs with varying numbers of
cells. By including R2 of the average cell voltage divider
network shown in Figure 3, battery-based programming
of the number of series-stacked cells could be realized
without defeating LTC4011 detection of battery insertion
or removal. Figure 12 shows a 2-cell NiMH battery pack
Figure 11. NiCd Battery Pack with Time Limit Control
Figure 10. Charging Waveforms Example
SHDN
VCC = 4.25V
DCIN
READY
VCDIV
TGATE
VCELL
CHRG
TOC
VTEMP
(PAUSE)
SHDN
TOP-OFF
AUTO
RECHARGE
FAST CHARGE
PRECHARGE
0.9V
EXTERNAL
PAUSE
200mV
4011 F10
7
1200mAhr
NiCd CELLS
BATTERY
PACK
VTEMP
4
CHEM
10
TIMER
NC
66.5k
4011 F11
+
–
10k
NTC
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