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参数资料
| 型号： | MAX8844ZETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER LI+ DUAL 14TDFN |
| 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 ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX8844ZETD+TDKR |
28V Dual Input Linear Li+ Battery Chargers with
Battery Detection and Overvoltage-Protected Output
Charger Enable Input
The MAX8844Z/MAX8844Y contain an active-low logic
input ( EN ) used to enable the chargers. Drive EN low,
leave unconnected, or connect to GND to enable the
charge-control circuitry. Drive EN high to disable the
charger-control circuitry. EN has an internal 200k Ω pull-
down resistor.
Soft-Start
The soft-start algorithm activates when entering fast-
charge mode. When the prequalification state is com-
plete (V BATT exceeds +2.5V), the charging current
ramps up in 250μs to the full charging current. This
reduces the inrush current demand on the input supply.
Applications Information
Fast-Charge Current Setting
The maximum charging current is programmed by an
external resistor connected from SETI to GND (R SETI ).
Use the following equation to determine the fast-charge
current (I FAST-CHARGE ):
Top-Off Current Threshold Setting
The top-off current threshold is programmed by an
external resistor connected from MIN to GND (R MIN ).
Use the following equation to determine the top-off cur-
rent (I MIN ):
I MIN (falling) = 126V/R MIN (k Ω ) + 27mA
I MIN (rising) = 248V/R MIN (k Ω ) - 16mA
where I MIN is in mA and R MIN is in k Ω . Use R MIN ≤
2.2k Ω .
Capacitor Selection
Connect a ceramic capacitor from BATT to GND for
proper stability. Use a 2.2μF ceramic capacitor for most
applications. Connect 1μF ceramic capacitors from IN
to GND and from USB to GND. A larger input capacitor
can be used for high charging current to reduce input
voltage ripple.
Connect 1μF ceramic capacitors from SAFEOUT to
GND and from SAFEUSB to GND. A larger bypass
capacitor for SAFEOUT and SAFEUSB can be used for
optimum noise immunity. Ceramic capacitors with X5R
I FAST - CHARGE =
1250V
R SETI
or X7R dielectric are highly recommended due to their
small size, low ESR, and small temperature coefficients.
where I FAST-CHARGE is in amps and R SETI is in ohms.
R SETI must always be 1.25k Ω or higher due to the con-
tinuous charging current limit of 1A RMS .
Thermal Considerations
The MAX8844Z/MAX8844Y are available in a thermally
enhanced TDFN package with an exposed pad.
Connect the exposed pad to a large copper ground
plane to provide a thermal contact between the device
and the circuit board for increased power dissipation.
The exposed pad transfers heat away from the device,
allowing the IC to charge the battery with maximum cur-
rent, while minimizing the increase in die temperature.
Table 3. Input Power-Supply Selection
IN
4.25V ≤ V IN ≤ 7V
4.25V ≤ V IN ≤ 7V
Not present
V IN ≥ 7.5V
4.25V ≤ V IN ≤ 7V
USB
4.25V ≤ V USB ≤ 7V
Not present
4.25V ≤ V USB ≤ 7V
4.25V ≤ V USB ≤ 7V
V USB ≥ 7.5V
CHARGER STATE
Enabled, selects IN power supply
Enabled, selects IN power supply
Enabled, selects USB power supply
Disabled
Enabled
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8844ZEVKIT+ | 功能描述:电源管理IC开发工具 MAX8844Y/Z Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8845WETC+ | 功能描述:电池管理 28V Linear Li+ Battery Charger 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 |
| MAX8845WETC+T | 功能描述:电池管理 28V Linear Li+ Battery Charger 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 |
| MAX8845XETC+ | 功能描述:电池管理 28V Linear Li+ Battery Charger 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 |
| MAX8845XETC+T | 功能描述:电池管理 28V Linear Li+ Battery Charger 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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