参数资料
型号: LTC4066EPF#TRPBF
厂商: Linear Technology
文件页数: 15/28页
文件大小: 0K
描述: IC USB POWER MANAGER 24-UTQFN
标准包装: 2,500
功能: 电源管理
电池化学: 锂离子(Li-Ion)
电源电压: 4.35 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-UFQFN 裸露焊盘
供应商设备封装: 24-UTQFN-EP(4x4)
包装: 带卷 (TR)
LTC4066/LTC4066-1
APPLICATIONS INFORMATION
I CL = ?
? V CLPROG ? =
USB Current Limit and Charge Current Control
The current limit and charger control circuits of the
LTC4066/LTC4066-1 are designed to limit input current as
well as control battery charge current as a function of I OUT .
The programmed input current limit, I CL , is de?ned as:
? 1000 ? 1000 V
? R CLPROG ? R CLPROG
The programmed battery charge current, I CHG , is de?ned
as:
The LTC4066/LTC4066-1 reduce battery charge current
such that the sum of the battery charge current and the
load current does not exceed the programmed input current
limit (one-?fth of the programmed input current limit when
HPWR is low, see Figure 2). The battery charge current
goes to zero when load current exceeds the programmed
input current limit (one-?fth of the limit when HPWR is
low). If the load current is greater than the current limit, the
output voltage will drop to just under the battery voltage
where the ideal diode circuit will take over and the excess
load current will be drawn from the battery.
I CHG = ?
? V PROG ? =
? 50, 000
? R PROG
?
?
50, 000 V
R PROG
Programming Current Limit
The formula for input current limit is:
I CL = ?
? V CLPROG ? =
Inputcurrent,I IN ,isequaltothesumoftheBATpinoutput
current and the OUT pin output current:
I IN = I OUT + I BAT
? 1000
? R CLPROG
?
?
1000 V
R CLPROG
The current limiting circuitry in the LTC4066/LTC4066-1
can and should be con?gured to limit current to 500mA
for USB applications (selectable using the HPWR pin and
programmed using the CLPROG pin).
where V CLPROG is the CLPROG pin voltage and R CLPROG is
the total resistance from the CLPROG pin to ground.
For example, if typical 500mA current limit is required,
calculate:
R CLPROG =
1 V
500 mA
? 1000 = 2 k
600
120
600
500
I IN
100
I IN
500
I IN
400
I LOAD
80
I LOAD
400
I LOAD
300
60
300
I BAT = I CHG
200
I BAT
CHARGING
40
I BAT
CHARGING
200
I BAT
I BAT = I CL – I OUT
100
0
20
0
100
0
CHARGING
–100
0
100
200
300
I LOAD (mA)
400
500 600
I BAT
(IDEAL DIODE)
–20
0
20
40
60
I LOAD (mA)
80
100 120
I BAT
(IDEAL DIODE)
–100
0
100
200
300
I LOAD (mA)
400
500 600
I BAT
(IDEAL DIODE)
4066 F02a
(2a) High Power Mode/Full Charge
R PROG = 100k and R CLPROG = 2k
4066 F02a
(2b) Low Power Mode/Full Charge
R PROG = 100k and R CLPROG = 2k
4055 F02c
(2c) High Power Mode with
I CL = 500mA and I CHG = 250mA
R PROG = 200k and R CLPROG = 2k
Figure 2. Input and Battery Currents as a Function of Load Current
4066fc
15
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