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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)： | 4/24頁 |
| 文件大小： | 212K |
| 代理商： | LTC4010CFE#PBF |
12
LTC4010
4010fa
Charge Termination
Fast charge termination parameters are dependent upon
the battery chemistry selected with the CHEM pin. Volt-
age-based termination (–
V) is always active after the
initial voltage stabilization period. If an external thermistor
network is present, chemistry-specific limits for
T/t
(rate of temperature rise) are also used in the termination
algorithm. Temperature-based termination, if enabled,
becomes active as soon as the fast charge state is entered.
Top-Off Charge State
If NiMH fast charge termination occurs because the
T/t
limit is exceeded after an initial period of tMAX/12 has ex-
pired, the LTC4010 enters the top-off charge state. Top-off
charge is implemented by sourcing one-tenth the pro-
grammed charge current for tMAX/3 minutes to ensure that
100% charge has been delivered to the battery. The CHRG
status output is active during the top-off state. If NiCd cells
have been selected with the CHEM pin, the LTC4010 never
enters the top-off state.
Automatic Recharge State
Once charging is complete, the automatic recharge state
is entered to address the self-discharge characteristics of
nickel chemistry cells. The charge status output is inactive
during automatic recharge, but VCDIV remains switched to
GND to monitor the average cell voltage. If the VCELL
voltage drops below 1.325V without falling below 350mV,
the charge timer is reset and a new fast charge cycle is
initiated.
The internal termination algorithms of the LTC4010 are
adjusted when a fast charge cycle is initiated from auto-
matic recharge, because the battery should be almost fully
charged. Voltage-based termination is enabled immedi-
ately and the NiMH
T/t limit is fixed at a battery
temperature rise of 1
°C/minute.
Fault State
As discussed previously, the LTC4010 enters the fault
state based on detection of invalid battery voltages during
various charging phases. The IC also monitors the regu-
lation of the PWM control loop and will enter the fault state
if this is not within acceptable limits. Once in the fault state,
the battery must be removed or DC input power must be
cycled in order to initiate further charging. In the fault
state, the FAULT output is active, the READY output is
inactive, charging stops and the charge indicator output is
inactive. The VCDIV output remains connected to GND to
allow detection of battery removal.
Note that the LTC4010 also uses the FAULT output to
indicate that charging is suspended due to invalid battery
or internal die temperatures. However, the IC does not
enter the fault state in these cases and normal operation
will resume when all temperatures return to acceptable
levels. Refer to the Status Outputs section for more detail.
Insertion and Removal of Batteries
The LTC4010 automatically senses the insertion or re-
moval of a battery by monitoring the VCELL pin voltage.
Should this voltage fall below 350mV, the IC considers the
battery to be absent. Removing and then inserting a
battery causes the LTC4010 to initiate a completely new
charge cycle beginning with charge qualification.
External Pause Control
After charging is initiated, the VTEMP pin may be used to
pause operation at any time. When the voltage between
VTEMP and GND drops below 200mV, the charge timer
pauses, fast charge termination algorithms are inhibited
and the PWM outputs are disabled. The status and VCDIV
outputs all remain active. Normal function is fully restored
from the previous state when pause ends.
OPERATIO
U
(Refer to Figure 1)
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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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