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| 型号： | LTC4006EGN-6#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 4A 16-SSOP |
| 标准包装： | 100 |
| 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： | 管件 |
LTC4006
APPLICATIO S I FOR ATIO
Charger Current Programming
The basic formula for charging current is:
Alternatively, a normally closed switch can be used to
detect when the battery is present (see Figure 8).
200
I CHARGE ( MAX )
=
100mV
R SENSE
180
160
Table 3. Recommended R SENSE Resistor Values
I MAX (A) R SENSE ( ? ) 1%
R SENSE (W)
140
120
100
1.0
2.0
3.0
4.0
0.100
0.050
0.033
0.025
0.25
0.25
0.5
0.5
80
60
40
20
0
Setting the Timer Resistor
100 150 200 250 300 350 400 450 500
R RT (k ? )
The charger termination timer is designed for a range of 1
hour to 3 hours with a ± 15% uncertainty. The timer is
programmed by the resistor R RT using the following
equation:
Figure 5. t TIMER vs R RT
3.3V
4006 F05
t TIMER = 10 ? 2 27 ? R RT ? 17.5pF (Refer to Figure 5)
(seconds)
LTC4006
CHG 2
200k
33k
V DD
μ P
OUT
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.
CHG Status Output Pin
IN
4006 F06
Figure 6. Microprocessor Interface
When the charge cycle starts, the CHG pin is pulled down
to ground by an internal N-channel MOSFET that can drive
more than 100 μ A. When the charge current drops to 10%
of the full-scale current (C/10), the N-channel MOSFET is
turned off and a weak 25 μ A current source to ground is
connected to the CHG pin. After a time out occurs, the pin
ADAPTER
POWER
SWITCH CLOSED IF
BATTERY CONNECTED
470k
LTC4006
1 DCIN
3 ACP/SHDN
4006 F07
will go into a high impedance state. By using two different
value pull-up resistors, a microprocessor can detect three
states from this pin (charging, C/10 and stop charging).
See Figure 6.
Figure 7
Battery Detection
ADAPTER
POWER
1 DCIN
LTC4006
It is generally not good practice to connect a battery while
the charger is running. The timer is in an unknown state
and the charger could provide a large surge current into
the battery for a brief time. The circuit shown in Figure 7
keeps the charger shut down and the timer reset while a
battery is not connected.
SWITCH OPEN WHEN
BATTERY CONNECTED
3 ACP/SHDN
Figure 8
4006 F08
4006fa
12
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| LTC4007EGN | 功能描述:IC BATT CHARGER CTRLR 4A 24SSOP 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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