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| 型号： | MAX8844ZETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/17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
Table 1. Autobooting Output States
ABI
Low
High
Low
Low
High
BATT
Present
Present
Not present
Present
Present
POK
High-Z
High-Z
Low
Low
Low
CHARGER STATE
Shutdown
Shutdown
CC/CV mode
Fast-charge/top-off
Fast-charge/top-off
ABO
(MAX8844Z)
Low
High
High
High
High
ABO
(MAX8844Y)
High-Z
Low
High-Z
High-Z
Low
Note: Present indicates that V BATT ≥ 2.0V and Not Present indicates that the battery is not connected.
impedance during shutdown. When interfacing with a
microprocessor logic input, a pullup resistor to the
microprocessor ’s I/O voltage may be required. If
DETBAT is not used, connect DETBAT to GND for nor-
mal operation.
Autobooting Assistant
The MAX8844Z/MAX8844Y contain an autobooting
assistant circuit that generates an enable signal for sys-
tem booting (ABO, ABO ). For the MAX8844Z, the boot-
ing assistant functions as an internal OR gate (Figure 1).
The first input is dependent on the input supply voltage
(V IN or V USB ) and DETBAT while the second input is an
external signal applied to ABI. The first input (POK) is dri-
ven high once DETBAT is pulled low through a resistor
less than 51k Ω , 2.35V ≤ (V IN or V USB ) ≤ 7V, and [(V IN or
V USB ) - V BATT ] ≥ 40mV (typ V IN rising).
The second input signal (ABI) is driven by an external
source (Table 1). ABI enables an autoboot signal when
a battery is connected at BATT and is independent of
POK . If POK is pulled low, the booting assistant always
drives ABO high regardless of ABI. ABI is pulled to
GND through an internal 200k Ω resistor. If ABI is sup-
plied from an outside exposed pin, an RC filter (Figure
Table 2. CHG States
4) is required for ESD protection and noise filtering. If
ABI is supplied by a system’s internal GPIO, or logic,
the RC filter is not required.
For the MAX8844Y, the output ABO is only dependent
on the state of ABI (Table 1).
CHG Charge Indicator Output
CHG is an open-drain output that indicates charge sta-
tus. Table 2 describes the state of CHG during different
stages of operation. CHG is suitable for driving a
charge indication LED. If the MAX8844Z/MAX8844Y are
used in conjunction with a microprocessor, a pullup
resistor to the logic I/O voltage allows CHG to indicate
charge status to the microprocessor instead of driving
an LED.
Thermal Regulation
The thermal-regulation loop limits the MAX8844Z/
MAX8844Y die temperatures to +115°C by reducing the
charge current as necessary. This feature not only pro-
tects the IC from overheating, but also allows a higher
charge current without risking damage to the system.
EN
High
Low
Low
Low
Low
V IN *
X
> 7.5V
X
4.25V ≤ V IN * ≤ 7.5V
4.25V ≤ V IN * ≤ 7.5V
4.25V ≤ V IN * ≤ 7.5V
V BATT
X
X
> V IN * - 30mV
< 2.4V
≥ 2.5V
4.2V
I BATT
0
0
10% of
I FAST-CHARGE ?
100% of I FAST-CHARGE ?
< I MIN
CHG
High-Z
High-Z
Low
Low
High-Z
STATE
Disabled
Shutdown
Precharge
Fast-charge
Top-off
X = Don’t care.
*V IN and V USB are interchangeable. See the DC and USB Power Supplies section.
? I FAST-CHARGE is reduced as necessary to prevent the die temperature from exceeding +115°C.
10
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相关代理商/技术参数 |
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| 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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