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参数资料
| 型号： | LTC4006EGN-4#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHGR CC/CV LI-ION 16SSOP |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
LTC4006
OPERATIO
be inhibited if it is not already active. If the charging current
decreases below 10% to 15% of programmed current,
LTC4006
CLK
while engaged in input current limiting, BGATE will be
forced low to prevent the charger from discharging the
battery. Audible noise can occur in this mode of operation.
R TH
10k
NTC
R9
32.4k
C7
0.47 μ F
6
NTC
S1
–
+
~4.5V
An overvoltage comparator guards against voltage tran-
sient overshoots (>7% of programmed value). In this
case, both MOSFETs are turned off until the overvoltage
condition is cleared. This feature is useful for batteries
which “load dump” themselves by opening their protec-
tion switch to perform functions such as calibration or
pulse mode charging.
As the voltage at BAT increases to near the input voltage
at DCIN, the converter will attempt to turn on the top
+
–
–
+
60k
45k
15k
MOSFET continuously (“dropout’’). A watchdog timer
detects this condition and forces the top MOSFET to turn
off for about 300ns at 40 μ s intervals. This is done to
D
C
Q
4006 F03
T BAD
prevent audible noise when using ceramic capacitors at
the input and output.
Charger Startup
When the charger is enabled, it will not begin switching
until the I TH voltage exceeds a threshold that assures initial
current will be positive. This threshold is 5% to 15% of the
maximum programmed current. After the charger begins
switching, the various loops will control the current at a
level that is higher or lower than the initial current. The
durationofthistransientconditiondependsupontheloop
compensation but is typically less than 100 μ s.
Thermistor Detection
The thermistor detection circuit is shown in Figure 3. It requires
an external resistor and capacitor in order to function properly.
The thermistor detector performs a sample-and-hold func-
Figure 3
This voltage is stored by C7. Then the switch is opened for a
short period of time to read the voltage across the thermistor.
t HOLD = 10 ? R RT ? 17.5pF = 54 μ s,
for R RT = 309k
When the t HOLD interval ends the result of the thermistor
testing is stored in the D flip-flop (DFF). If the voltage at
NTC is within the limits provided by the resistor divider
feeding the comparators, then the NOR gate output will be
low and the DFF will set T BAD to zero and charging will
continue. If the voltage at NTC is outside of the resistor
divider limits, then the DFF will set T BAD to one, the charger
will be shut down, and the timer will be suspended until
T BAD returns to zero (see Figure 4).
tion. An internal clock, whose frequency is determined by
the timing resistor connected to R T , keeps switch S1
closed to sample the thermistor:
CLK
(NOT TO
SCALE)
t HOLD
t SAMPLE
t SAMPLE = 127.5 ? 20 ? R RT ? 17.5pF = 13.8ms,
for R RT = 309k
VOLTAGE ACROSS THERMISTOR
COMPARATOR HIGH LIMIT
The external RC network is driven to approximately 4.5V
and settles to a final value across the thermistor of:
V NTC
COMPARATOR LOW LIMIT
4006 F04
V RTH ( FINAL )
=
4. 5V ? R TH
R TH + R 9
Figure 4
4006fa
11
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| LTC4006EGN-6 | 功能描述:IC CHARGER BATTERY 4A 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4006EGN-6#PBF | 功能描述:IC CHARGER BATTERY 4A 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4006EGN-6#TR | 功能描述:IC BATT CHGR CC/CV LI-ION 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4006EGN-6#TRPBF | 功能描述:IC CHARGER BATTERY 4A 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4007 | 制造商:LINER 制造商全称:Linear Technology 功能描述:4A, High Efficiency, Standalone Li Battery Charger |
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