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| 型号： | LTC4007EGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/24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
Battery Detection
It is generally not good practice to connect a battery while
the charger is running. The timer is in an unknown state
LTC4007
PROG
11
and the charger could provide a large surge current into
the battery for a brief time. The Figure 5 circuit keeps the
charger shut down and the timer reset while a battery is
5V
R PROG
Q1
C PROG
R Z
102k
not connected.
0V
2N7002
4007 F06
ADAPTER
POWER
SWITCH CLOSED
WHEN BATTERY
CONNECTED
LTC4007
1 DCIN
24 SHDN
4007 F05
Figure 6. PWM Current Programming
Charging current can be programmed by pulse width
modulating R PROG with a switch Q1 to R PROG at a frequency
higher than a few kHz (Figure 6). C PROG must be increased
to reduce the ripple caused by the R PROG switching. The
I CHARGE ( MAX ) =
R PROG =
Figure 5
Charger Current Programming
The basic formula for charging current is:
V REF ? 3.01k Ω / R PROG – 0.035 V
R SENSE
V REF = 1.19V
This leaves two degrees of freedom: R SENSE and R PROG .
The 3.01k input resistors must not be altered since in-
ternal currents and voltages are trimmed for this value.
Pick R SENSE by setting the average voltage between C SP
and BAT to be close to 100mV during maximum charger
current. Then R PROG can be determined by solving the
above equation for R PROG .
V REF ? 3 . 01 k Ω
R SENSE ? I CHARGE ( MAX ) + 0 . 035 V
Table 2. Recommended R SNS and R PROG Resistor Values
compensation capacitor at ITH will probably need to be
increased also to improve stability and prevent large
overshoot currents during start-up conditions. Charging
current will be proportional to the duty cycle of the switch
with full current at 100% duty cycle and zero current when
Q1 is off.
Maintaining C/10 Accuracy
The C/10 comparator threshold that drives the FLAG pin
has a ?xed threshold of approximately V PROG = 400mV.
This threshold works well when R PROG is 26.7k, but will
not yield a 10% charging current indication if R PROG is
a different value. There are situations where a standard
value of R SENSE will not allow the desired value of charging
current when using the preferred R PROG value. In these
cases, where the full-scale voltage across R SENSE is within
±20mV of the 100mV full-scale target, the input resistors
connected to CSP and BAT can be adjusted to provide the
desired maximum programming current as well as the
correct FLAG trip point.
I MAX (A)
1.0
2.0
3.0
4.0
R SENSE (Ω) 1%
0.100
0.050
0.033
0.025
R SENSE (W)
0.25
0.25
0.5
0.5
R PROG (kΩ) 1%
26.7
26.7
26.7
26.7
For example, the desired max charging current is 2.5A
but the best R SENSE value is 0.033Ω. In this case, the
voltage across R SENSE at maximum charging current is
only 82.5mV, normally R PROG would be 30.1k but the
nominal FLAG trip point is only 5% of maximum charging
current. If the input resistors are reduced by the same
4007fc
13
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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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