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| 型号： | MAX8814ETA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER LI+ 28V 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） |
| 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： | 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： | MAX8814ETA+TDKR |
28V Linear Li+ Battery Charger with
Smart Autoboot Assistant
ASYNCHRONOUS
SHUTDOWN
CHARGER = DISABLED
FROM ANYWHERE
V IN > 7V, OR
V BATT < 2.5V
(V IN - V BATT ) < 30mV
V IN > 7V, OR
(V IN - V BATT ) < 30mV, OR
IC DISABLED
(V IN - V BATT ) < 30mV, OR
PRECHARGE
10% CHARGE CURRENT
V BATT < 2.4V
V BATT ≥ 2.5V
FAST-CHARGE
V IN < 7V, AND
(V IN - V BATT ) ≥ 40mV, AND
IC ENABLED
V BATT ≥ 4.2V
IC DISABLED
VOLTAGE REGULATION
CONSTANT-CURRENT CHARGE
100% CHARGE CURRENT
Figure 2. Charge-State Diagram
V BATT < 4.2V
CONSTANT VOLTAGE CHARGE
REGULATED 4.2V AT BATT
Charger Enable Input
The MAX8814 contains an active-low logic input ( EN )
used to enable the charger. Drive EN low, leave uncon-
Table 1. ABO and POK States
ABI BATT POK CHARGER STATE
ABO
nected, or connect to GND to enable the charger-
Low
Present
Hi-Z
Shutdown
Low
control circuitry. Drive EN high to disable the charger-
control circuitry. EN has an internal 200k Ω pull-down
resistor.
POK Output
The open-drain POK output asserts low when V IN ≥
4.25V and (V IN - V BATT ) ≥ 40mV (typ, V IN rising). POK
requires an external pullup resistor (1M Ω typ) to an
external power supply. POK is high impedance when
V BATT ≥ (V IN - 40mV).
Autobooting Assistant
The MAX8814 contains an autobooting assistant circuit
that generates an enable signal for system booting
(ABO). The booting assistant functions as an internal
“OR” gate (Figure 1). The first input is dependent on
the input voltage (V IN ), and the second input is an
external signal applied to ABI. The first input (POK) is
driven high once V IN ≥ 4.25V and (V IN - V BATT ) ≥ 40mV
(typ, V IN rising).
The second input signal (ABI) is driven by an external
source. ABI enables an autoboot signal (ABO high)
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 (see Table 1).
ABI is pulled to GND through an internal 200k Ω resistor.
High Present Hi-Z Shutdown High
Fast-charge/voltage
X Not present Low High
regulation
Fast-charge/voltage
X Present Low High
regulation
X = Don’t care.
If ABI is driven externally, a RC filter (R1 and C2 of
Figure 3) is required for ESD protection and noise filter-
ing. If ABI is supplied by a system’s internal GPIO, or
logic, the RC filter is not required.
Soft-Start
The soft-start algorithm activates when entering fast-
charge mode. In the MAX8814, when the prequalifica-
tion state is complete (V BATT ≥ 2.5V), the charging
current ramps up in 250μs to the full charging current.
This reduces the inrush current on the input supply.
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相关代理商/技术参数 |
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|---|---|
| MAX8814EVKIT+ | 功能描述:电源管理IC开发工具 MAX8814 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 |
| MAX8815AETB+ | 制造商:Maxim Integrated Products 功能描述:1A 97% EFFICIENCY 30UA QUIESCENT 制造商:Maxim Integrated Products 功能描述:1A, 97% EFFICIENCY, 30?A QUIESCENT CURRENT, STEP-UP CONVERTE - Bulk |
| MAX8815AETB+T | 功能描述:直流/直流开关转换器 Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX8815AEVKIT+ | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX8815A 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 |
| MAX8818AETM+ | 功能描述:PMIC 解决方案 10Ch PMIC for 2-Cell Li+ DVC System RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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