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参数资料
| 型号： | MAX8845ZEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX8845Z |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MAX8845 |
| 主要属性： | 1 芯锂离子电池，4.25 V 至 7.5 V 输入 |
| 次要属性： | 状态 LED |
| 已供物品： | 板 |
28V 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
(MAX8845Z)
Low
High
High
High
High
ABO
(MAX8845Y/
MAX8845X/MAX8845W)
High-Z
Low
High-Z
High-Z
Low
Note: Present indicates that V BATT ≥ 2V and Not Present indicates that the battery is not connected.
Table 2. CHG States
EN
High
Low
Low
Low
Low
V IN
X
> 7.5V
X
4.25V (4.4V for MAX8845W only) ≤ V IN ≤ 7.5V
4.25V (4.4V for MAX8845W only) ≤ V IN ≤ 7.5V
4.25V (4.4V for MAX8845W only) ≤ V IN ≤ 7.5V
V BATT
X
X
> V IN - 30mV
< 2.4V
≥ 2.5V
4.2V (4.35V for
MAX8845W only)
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.
*I FAST-CHARGE is reduced as necessary to prevent the die temperature from exceeding +115°C.
MAX8845W are used in conjunction with a microproces-
sor, 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 MAX8845Z/
MAX8845Y/MAX8845X/MAX8845W die temperature to
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 ):
+115°C by reducing the charge current as necessary.
This feature not only protects the IC from overheating,
but also allows a higher charge current without risking
I FAST _ CHARGE =
1400 V
R SETI
damage to the system.
Charger Enable Input
where I FAST_CHARGE is in amps and R SETI is in ohms.
R SETI must always be 1.4k ? or higher due to the con-
The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W
contain 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 ? pulldown 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.
tinuous charging current limit of 1A RMS .
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) = 148V/R MIN (k ? ) + 22mA
I MIN (rising) = 295V/R MIN (k ? ) - 24mA
where I MIN is in mA and R MIN is in k ? . Use R MIN ≤
2.2k ? .
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8845ZEVKIT+ | 功能描述:电源管理IC开发工具 MAX8845Y/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 |
| MAX8847ZETE+ | 制造商:Maxim Integrated Products 功能描述:NEGATIVE CHARGE PUMP FOR 6 WLEDS - Rail/Tube |
| MAX8848YETE+ | 制造商:Maxim Integrated Products 功能描述:NEGATIVE CHARGE PUMP FOR 7 WLEDS - Rail/Tube |
| MAX8848YETE+T | 制造商:Maxim Integrated Products 功能描述:NEGATIVE CHARGE PUMP FOR 7 WLEDS - Tape and Reel |
| MAX8848ZETE+ | 制造商:Maxim Integrated Products 功能描述:NEGATIVE CHARGE PUMP FOR 7 WLEDS - Rail/Tube |
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