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參數(shù)資料
| 型號： | LTC4010CFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| 中文描述： | BATTERY CHARGE CONTROLLER, 615 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, LEAD FREE, EXPOSED PAD, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大小： | 212K |
| 代理商： | LTC4010CFE#PBF |
20
LTC4010
4010fa
APPLICATIO S I FOR ATIO
WU
UU
Figure 9. Charging Waveforms Example
SHDN
VCC ≥ BAT + 500mV
VCC < BAT + 25mV
VCC
READY
VCDIV
TGATE
VCELL
CHRG
VTEMP
(PAUSE)
SHDN
TOP-OFF
AUTO
RECHARGE
FAST CHARGE
PRECHARGE
0.9V
EXTERNAL
PAUSE
200mV
4010 F09
selected in this example. However, NiCd parameters could
be chosen as well.
Unlike all of the other applications discussed so far, the
battery continues to power the system during charging.
The MCU could be powered directly from the battery or
from any type of post regulator operating from the bat-
tery. In this configuration, the LTC4010 relies expressly
on the ability of the host MCU to know when load tran-
sients will be encountered. The MCU should then pause
charging (and thus –
V processing) during those events
to avoid premature fast charge termination. If the MPU
cannot reliably perform this function, the battery
should
be disconnected from the load with a rectifier or switch
during charging. Excessive battery load current variations,
such as those generated by a post-regulating PWM, can
generate sufficient voltage noise to cause the LTC4010 to
prematurely terminate a charge cycle and/or prematurely
restart a fast charge. In this case, it may be necessary to
inhibit the LTC4010 after charging is complete until ex-
ternal gas gauge circuitry indicates that recharging is nec-
essary. Shutdown power is applied to the LTC4010
through the body diode of the P-channel MOSFET in this
application.
Waveforms
Sample waveforms for a standalone application during a
typical charge cycle are shown in Figure 9. Note that these
waveforms are not to scale and do not represent the
complete range of possible activity. The figure is simply
intended to allow better conceptual understanding and to
highlight the relative behavior of certain signals generated
by the LTC4010 during a typical charge cycle.
Initially, the LTC4010 is in low power shutdown as the
system operates from a heavily discharged battery. A DC
adapter is then connected such that VCC rises above 4.25V
and is 500mV above BAT. The READY output is asserted
when the LTC4010 completes charge qualification.
When the LTC4010 determines charging should begin, it
starts a precharge cycle because VCELL is less than 900mV.
As long as the temperature remains within prescribed
limits, the LTC4010 charges (TGATE switching), applying
limited current to the battery with the PWM in order to
bring the average cell voltage to 900mV.
When the precharge state timer expires, the LTC4010 be-
gins fast charge if VCELL is greater than 900mV. The PWM,
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4010CFETR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4010CFETRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4010EFE | 制造商:LINEAR 制造商全稱:LINEAR 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4011 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4011_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
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