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参数资料
| 型号： | MAX8808XETA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR 1-CELL LI+ 8TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 0 V ~ 15 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（2x2） |
| 包装： | 标准包装 |
| 其它名称： | MAX8808XETA+TDKR |
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
VL Internal Voltage Regulator
The MAX8808X/MAX8808Y/MAX8808Z linear chargers
contain an internal linear regulator to supply the power
for the IC. Bypass VL to GND with a 0.47μF ceramic
capacitor. VL is regulated to 3.0V whenever the input
voltage is above the battery voltage.
CHG Charge-Indicator Output
CHG is an open-drain output that indicates charge sta-
tus. Table 1 describes the state of CHG during different
stages of operation. CHG is suitable for driving a
charge-indication LED. If the MAX8808X/MAX8808Y/
MAX8808Z is used in conjunction with a μP, a pullup
resistor to the logic I/O voltage allows CHG to indicate
charge status to the μP instead of driving an LED.
Soft-Start
The soft-start algorithm activates when entering fast-
charge mode. In the MAX8808X, when the prequalifica-
tion state is complete (V BATT exceeds +2.5V), the
charging current ramps up in 1ms to the full charging
current. This reduces the inrush current on the input
supply. Note that the MAX8808Y and MAX8808Z do not
have a prequalification state and enter soft-start directly
after being enabled.
Applications Information
Charge-Current Selection
The maximum charging current is programmed by an
external resistor connected from ISET to GND (R ISET ).
Calculate R ISET as follows:
R ISET = 1302V / I FASTCHG
where I FASTCHG is in Amps and R ISET is in Ohms. ISET
can be used to monitor the fast-charge current level.
The output current from ISET is 1.08mA per amp of
charging current. The output voltage at ISET is propor-
tional to the charging current:
V ISET = (I CHARGE x R ISET ) / 930
The voltage at ISET is nominally 1.4V at the selected
fast-charge current, and falls with charging current as
the cell becomes fully charged or as the thermal-regu-
lation circuitry activates.
Capacitor Selection
Connect a ceramic capacitor from BATT to GND for
proper stability. Use a 1μF X5R ceramic capacitor for
most applications. Connect a 1μF ceramic capacitor
from IN to GND. Use a larger input bypass capacitor
for high charging currents to reduce supply noise.
Connect a 0.47μF ceramic capacitor from VL to GND.
Thermal Considerations
The MAX8808X/MAX8808Y/MAX8808Z are available in
a thermally enhanced TDFN package with exposed
paddle. Connect the exposed paddle to a large cop-
per ground plane to provide a thermal contact
between the device and the circuit board for increased
power dissipation. The exposed paddle transfers heat
away from the device, allowing the ICs to charge the
battery with maximum current, while minimizing the
increase in die temperature.
Table 1. CHG States
EN
MAX8808X
X
Low
Low
Low
Low
High
EN
MAX8808Y
X
—
High
High
High
Low
EN
MAX8808Z
X
—
Low
Low
Low
High
V IN
≤ V BATT
4.25V ≤ V IN ≤ 7V
4.25V ≤ V IN ≤ 7V
4.25V ≤ V IN ≤ 7V
>7V
X
V BATT
≥ V IN
<2.4V
≥ 2.5V
4.2V
X
X
I BATT
0
10% of I FAST
I FAST *
<10% of I FAST
0
0
CHG
High-Impedance
Low
Low
High-Impedance
High-Impedance
High-Impedance
STATE
Shutdown
Prequal
Fast-Charge
Top-off
Shutdown
Disabled
X = Don’t care.
— = Prequal not applicable to MAX8808Y and MAX8808Z.
*I FAST is reduced as necessary to prevent the die temperature from exceeding +115°C.
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8808YETA | 制造商:Maxim Integrated Products 功能描述:1A LINEAR LI+ BATT CHRGRS W. INTEG - Rail/Tube |
| MAX8808YETA+ | 制造商:Maxim Integrated Products 功能描述:CHRGR LI-ION/LI-POL 1000MA 4.2V 8TDFN EP - Rail/Tube |
| MAX8808YETA+T | 功能描述:电池管理 1A Linear Li+ Batt Chrgrs w. Integ Pass FET & Thermal Reg in 2mmx2mm TDFN 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 |
| MAX8808YETA-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 |
| MAX8808ZETA | 制造商:Maxim Integrated Products 功能描述:1A LINEAR LI+ BATT CHRGRS W. INTEG - Rail/Tube |
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