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参数资料
| 型号： | MAX1736ETT42+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHRGR SGL LI+ 6-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.7 V ~ 22 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 供应商设备封装： | 6-TDFN 裸露焊盘（3x3） |
| 包装： | 带卷 (TR) |
SOT23, Single-Cell Li+ Battery Charger
for Current-Limited Supply
IN
V BATT + 100mV
EN
IN
GATE
IN
6mA
350k
10 μ A
1.4V
CT
0.4V
STATE
MACHINE
REF
4.2V (4.1V)
5V
BATT
2 μ A
Figure 1. Functional Diagram
Once the switch turns off, it remains off for at least the
minimum off-time. After the minimum off-time, the P-
channel MOSFET turns on if the cell voltage is lower
than the BATT regulation voltage. A C CT value of
0.33μF sets a minimum off-time of 33ms.
At the beginning of the pulsed top-off state, charge cur-
rent is modulated at approximately an 83% duty cycle.
Toward the end of top-off, charge current stays off for
long periods of time between single “ on ” pulses. During
these final pulses, the instantaneous cell voltage may
exceed the BATT regulation voltage by several hun-
dred millivolts, but these pulses are orders of magni-
tude shorter than the electrochemical time constant of
the Li+ cell and do no harm. Pulsed top-off charge
ends when the cell voltage no longer falls below the
BATT regulation voltage. Figure 2 shows the state
machine.
Selecting External Components
Input Power Supply
One reason the MAX1736 Li+ charger is so compact
and simple is that the charging current is set by the
GND
MAX1736EUT42
(MAX1736EUT41)
external power source, not by the MAX1736. The P-
channel MOSFET in Figure 3 ’ s application circuit is
either on or off, allowing the source to be directly con-
nected to the cell or disconnected. Therefore, it is
important to choose a power supply with the correct
current limit for the cell to be charged. In most applica-
tions, this will be a small wall cube with an open-circuit
output voltage of 5V to 12V, which is specified as “ cur-
rent limited ” or “ constant current. ”
Some low-cost wall cubes may have poor transient
characteristics. For these wall cubes, output current
may exceed the specified current limit by several times
when the load is quickly connected. The MAX1736 lim-
its this current peak by controlling the slew rate of the
P-channel MOSFET. See C CT and C GATE for more
information.
PMOS Switch
The P-channel MOSFET switches the current-limited
source on and off. Because of the intentionally slow
switching times and limited slew rate, the MAX1736 is
not particular about the power FET it drives. Spec-
ifications to consider when choosing an appropriate
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1736EUT | 制造商:Maxim Integrated Products 功能描述:SOT23 SINGLE-CELL LI+ BATTERY CHAR - Rail/Tube |
| MAX1736EUT+T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1736EUT41 | 制造商:Maxim Integrated Products 功能描述:SOT23 SINGLE-CELL LI+ BATTERY CHAR - Cut Tape Product |
| MAX1736EUT41+T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1736EUT41-T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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