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| 型号： | LTC4007EGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/24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 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4007
APPLICATIONS INFORMATION
amount as the full-scale voltage is reduced then, R4 =
R5 = 2.49k and R PROG = 26.7k, the maximum charging
current is still 2.5A but the FLAG trip point is maintained
at 10% of full scale.
There are other effects to consider. The voltage across the
current comparator is scaled to obtain the same values as
the 100mV sense voltage target, but the input referred sense
voltage is reduced, causing some careful consideration of
the ripple current. Input referred maximum comparator
threshold is 117mV, which is the same ratio of 1.4x the
DC target. Input referred I REV threshold is scaled back to
–24mV. The current at which the switcher starts will be
reduced as well so there is some risk of boost activity.
These concerns can be addressed by using a slightly larger
inductor to compensate for the reduction of tolerance to
ripple current.
Charger Voltage Programming
Pins CHEM and C3C4 are used to program the charger
?nal output voltage. The CHEM pin programs Li-Ion bat-
tery chemistry for 4.1V/cell (low) or 4.2V/cell (high). The
C3C4 pin selects either 3 series cells (low) or 4 series
cells (high). It is recommended that these pins be shorted
to ground (logic low) or left open (logic high) to effect
the desired logic level. Use open-collector or open-drain
outputs when interfacing to the CHEM and 3C4C pins from
a logic control circuit.
200
180
160
140
120
100
80
60
40
20
0
100 150 200 250 300 350 400 450 500
R RT (kΩ)
4007 F07
Figure 7. t TIMER vs R RT
It is important to keep the parasitic capacitance on the R T
pin to a minimum. The trace connecting R T to R RT should
be as short as possible.
Soft-Start
The LTC4007 is soft started by the 0.12μF capacitor on
the ITH pin. On start-up, ITH pin voltage will rise quickly
to 0.5V, then ramp up at a rate set by the internal 40μA
pull-up current and the external capacitor. Battery charging
current starts ramping up when ITH voltage reaches 0.8V
and full current is achieved with ITH at 2V. With a 0.12μF
capacitor, time to reach full charge current is about 2ms and
it is assumed that input voltage to the charger will reach
Table 3. Charger Voltage Programming
V FINAL (V) 3C4C
CHEM
full value in less than 2ms. The capacitor can be increased
up to 1μF if longer input start-up times are needed.
12.3
12.6
16.4
16.8
LOW
LOW
HIGH
HIGH
LOW
HIGH
LOW
HIGH
Input and Output Capacitors
The input capacitor (C2) is assumed to absorb all input
switching ripple current in the converter, so it must have
adequate ripple current rating. Worst-case RMS ripple
Setting the Timer Resistor
The charger termination timer is designed for a range
of 1hour to 3 hour with a ±15% uncertainty. The timer
is programmed by the resistor R RT using the following
current will be equal to one half of output charging current.
Actual capacitance value is not critical. Solid tantalum
low ESR capacitors have high ripple current rating in a
relatively small surface mount package, but caution must
equation:
t TIMER = 10 ? 2 27 ? R RT ? 17.5pF (seconds)
4007fc
14
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相关代理商/技术参数 |
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| 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) |
| LTC4007EUFD-1#TRPBF | 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) |
| LTC4008 | 制造商:LINER 制造商全称:Linear Technology 功能描述:4A, High Efficiency, Standalone Li Battery Charger |
| LTC4008EGN | 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP 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) |
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