参数资料
| 型号： | LTC4000IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/40页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 28-SSOP |
| 产品培训模块： | LTC4000 60V Battery Charging Controller and Power Management |
| 标准包装： | 2,500 |
| 系列： | PowerPath™ |
| 功能： | 充电管理，电源管理 |
| 电池化学： | 多化学 |
| 电源电压： | 3 V ~ 60 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
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LTC4000
APPLICATIONS INFORMATION
R3 = NTC
ThevalueofR3andR D cannowbesetaccordingtothe
following formula:
R at cold_ threshold – R NTC at hot _ threshold
2.461
R D = 0.219 ? R NTC at cold_ threshold –
The FLT and CHRG Indicator Pins
The FLT and CHRG pins in the LTC4000 provide status
indicators. Table 2 summarizes the mapping of the pin
states to the part status.
Table 2. FLT and CHRG Status Indicator
1.219 ? R NTC at hot _ threshold
FLT
CHRG
STATUS
Note the important caveat that this method can only be
used to desensitize the thermal effect on the thermistor
and hence push the hot and cold temperature thresholds
apart from each other. When using the formulas above,
if the user finds that a negative value is needed for R D ,
the two temperature thresholds selected are too close to
each other and a higher sensitivity thermistor is needed.
For example, this method can be used to set the hot
and cold thresholds independently to 60°C and –5°C.
Using a Vishay Curve 2 thermistor whose nominal value
at 25°C is 100k, the formula results in R3 = 130k and
R D = 41.2k for the closest 1% resistors values.
To increase thermal sensitivity such that the valid charging
temperature band is much smaller than 40°C, it is pos-
sible to put a PTC (positive thermal coefficient) resistor
in series with R3 between the BIAS pin and the NTC pin.
This PTC resistor also needs to be thermally coupled with
the battery. Note that this method increases the number of
thermal sensing connections to the battery pack from one
wire to three wires. The exact value of the nominal PTC
resistor required can be calculated using a similar method
as described above, keeping in mind that the threshold at
the NTC pin is always 75% and 35% of V BIAS .
Leaving the NTC pin floating or connecting it to a capacitor
disables all NTC functionality.
0 0 NTC Over Ranged – Charging Paused
1 0 Charging Normally
0 1 Charging Terminated and Bad Battery Detected
1 1 V IBMON < (V C/X – 10mV)
where 1 indicates a high impedance state and 0 indicates
a low impedance pull-down state.
Note that V IBMON < (V CX – 10mV) corresponds to charge
termination only if the C/X termination is selected. If the
charger timer termination is selected, constant voltage
charging may continue for the remaining charger timer
period even after the indicator pins indicate that V IBMON
< (V CX – 10mV). This is also true when no termination is
selected, constant voltage charging will continue even after
the indicator pins indicate that V IBMON < (V CX – 10mV).
The BIAS Pin
For ease of use the LTC4000 provides a low dropout volt-
age regulator output on the BIAS pin. Designed to provide
up to 0.5mA of current at 2.9V, this pin requires at least
470nF of low ESR bypass capacitance for stability.
Use the BIAS pin as the pull-up source for the NTC resis-
tor networks, since the internal reference for the NTC
circuitry is based on a ratio of the voltage on the BIAS
pin. Furthermore, various 100k pull-up resistors can be
conveniently connected to the BIAS pin.
4000fb
22
For more information www.linear.com/LTC4000
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| LTC4000IUFD#PBF | 功能描述:IC CHARGER BATTERY 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 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) |
| LTC4000IUFD#TRPBF | 功能描述:IC CHARGER BATTERY 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 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) |
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| LTC4000IUFD-1#TRPBF | 功能描述:IC CHARGE MGMT MULTI CHEM 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 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) |
| LTC4001 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2A Synchronous Buck Li-Ion Charger |
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