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参数资料
| 型号： | LTC4007EGN |
| 厂商： | Linear Technology |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER CTRLR 4A 24SSOP |
| 标准包装： | 55 |
| 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： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
LTC4007
APPLICATIONS INFORMATION
Disabling the Thermistor Function
If the thermistor is not needed, connecting a resistor be-
tween DCIN and NTC will disable it. The resistor should be
sized to provide at least 10μA with the minimum voltage
applied to DCIN and 10V at NTC. Do not exceed 30μA.
Generally, a 301k resistor will work for DCIN less than
15V. A 499k resistor is recommended for DCIN between
15V and 24V.
Conditioning Depleted Batteries
Severely depleted batteries, with less than 2.5V/cell, should
be conditioned with a trickle charge to prevent possible
damage. This trickle charge is typically 10% of the 1C
rate of the battery. The LTC4007 can automatically trickle
charge depleted batteries using the circuit in Figure 11.
If the battery voltage is less than 2.5V/cell (2.44V/cell if
CHEM is low) then the LOBAT indicator will be low and Q4
is off. This programs the charging current with R PROG = R6
+ R14. Charging current is approximately 300mA. When
the cell voltage becomes greater than 2.5V the LOBAT
indicator goes high, Q4 shorts out R13, then R PROG = R6.
Charging current is then equal to 3A.
PCB Layout Considerations
For maximum ef?ciency, the switch node rise and fall
times should be minimized. To prevent magnetic and
electrical ?eld radiation and high frequency resonant
problems, proper layout of the components connected to
the IC is essential (see Figure 12). Here is a PCB layout
priority list for proper layout. Layout the PCB using this
speci?c order.
1. Input capacitors need to be placed as close as possible
to switching FET’s supply and ground connections.
Shortest copper trace connections possible. These
parts must be on the same layer of copper. Vias must
not be used to make this connection.
2. The control IC needs to be close to the switching FET’s
gate terminals. Keep the gate drive signals short for a
clean FET drive. This includes IC supply pins that connect
to the switching FET source pins. The IC can be placed
on the opposite side of the PCB relative to above.
3. Place inductor input as close as possible to switching
FET’s output connection. Minimize the surface area of
this trace. Make the trace width the minimum amount
needed to support current—no copper ?lls or pours.
Avoid running the connection using multiple layers in
parallel. Minimize capacitance from this node to any
other trace or plane.
4. Place the output current sense resistor right next to the
inductor output but oriented such that the IC’s current
sense feedback traces going to resistor are not long. The
feedback traces need to be routed together as a single
pair on the same layer at any given time with smallest
trace spacing possible. Locate any ?lter component on
these traces next to the IC and not at the sense resistor
location.
5. Place output capacitors next to the sense resistor output
and ground.
6. Output capacitor ground connections need to feed into
same copper that connects to the input capacitor ground
before tying back into system ground.
4007fc
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相关代理商/技术参数 |
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| LTC4007EGN#PBF | 功能描述:IC BATT CHARGER CTRLR 4A 24SSOP 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 |
| LTC4007EGN#TR | 功能描述:IC CHARGER BATTERY 4A 24-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) |
| LTC4007EGN#TRPBF | 功能描述:IC BATT CHARGER CTRLR 4A 24SSOP 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) |
| LTC4007EUFD-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:4A, High Efficiency, Li-Ion Battery Charger |
| LTC4007EUFD-1#PBF | 功能描述:IC CHARGER BATTERY 4A 24-QFN 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) |
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