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参数资料
| 型号： | MAX8663ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/34页 |
| 文件大小： | 0K |
| 描述： | IC PMIC LI+ SNGL CELL 40TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 手持/移动设备 |
| 电流 - 电源： | 900µA |
| 电源电压： | 4.1 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Power-Management ICs for
Single-Cell, Li+ Battery-Operated Devices
is enabled. It first detects the battery voltage. If the bat-
tery voltage is less than the BAT prequalification thresh-
old (3.0V), the charger enters prequalification mode in
MONITORING THE BATTERY CHARGE CURRENT WITH V ISET
which the battery charges at 10% of the maximum fast-
charge current. This slow charge ensures that the bat-
V ISET =
R ISET
1556
x I BAT
tery is not damaged by fast-charge current while
deeply discharged. Once the battery voltage rises to
3.0V, the charger transitions to fast-charge mode and
applies the maximum charge current. As charging con-
tinues, the battery voltage rises until it reaches the bat-
tery regulation voltage (4.2V) where charge current
starts tapering down. When charge current decreases
to 7.5% of fast-charge current, the charger enters top-
off mode. Top-off charging continues for 30min, then all
charging stops. If the battery voltage subsequently
drops below the 4.1V recharge threshold, charging
restarts and the timers reset.
1.5
0
Charge Current
DISCHARGING
0
1556 x (1.5V/R ISET )
t PREQUAL = 30 min ×
ISET adjusts the MAX8662/MAX8663 charging current
to match the capacity of the battery. A resistor from
ISET to ground sets the maximum fast-charge current,
the charge current in prequal, and the charge-current
threshold below which the battery is considered com-
pletely charged. Calculate these thresholds as follows:
I CHG-MAX = 1556 x 1.5V / R ISET
I PRE-QUAL = 10% x I CHG-MAX
I TOP-OFF = 7.5% x I CHG-MAX
Determine the I CHG-MAX value by considering the char-
acteristics of the battery, and not the capabilities of the
expected AC adapter/USB charging input, the system
load, or thermal limitations of the PCB. The MAX8662/
MAX8663 automatically adjust the charging algorithm
to accommodate these factors.
BATTERY-CHARGING CURRENT (A)
Figure 5. Monitoring the Battery Charge Current with ISET
Output Voltage
Charge Timer
As shown in Figure 3, the MAX8662/MAX8663 feature a
fault timer for safe charging. If prequalification charging
or fast charging does not complete within the time limits,
which are programmed by the timer capacitor at CT, the
charger stops charging and issues a timeout fault.
Charging can be resumed by either toggling CEN or
cycling the DC input voltage.
The MAX8662/MAX8663 support values of C CT from
0.01μF to 1μF:
C CT
0 . 068 μ F
In addition to setting the charge current, ISET also pro-
vides a means to monitor battery-charge current. The
output voltage of the ISET pin tracks the charge current
t FST ? CHG = 300 min ×
C CT
0 . 068 μ F
delivered to the battery, and can be used to monitor the
charge rate, as shown in Figure 5. A 1.5V output indi-
cates the battery is being charged at the maximum set
fast-charge current; 0V indicates no charging. This volt-
When the charger exits fast-charge mode, CHG goes
high impedance and top-off mode is entered. Top-off
time is also determined by the capacitance at CT:
age is also used by the charger control circuitry to set
and monitor the battery current. Avoid adding more
than 10pF capacitance directly to the ISET pin. If filter-
t TOP ? OFF = 300 min ×
C CT
0 . 068 μ F
ing of the charge-current monitor is necessary, add a
resistor of 100k ? or more between ISET and the filter
capacitor to preserve charger stability.
In fast-charge mode, the fault timer is suspended when
the charge current is limited, by input or thermal limit-
ing, to less than 20% of I CHG-MAX.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8663EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX8663 EVAL KIT - Boxed Product (Development Kits) |
| MAX8664AEEP+ | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8664AEEP+T | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8664BEEP+ | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8664BEEP+T | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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