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参数资料
| 型号： | DS2731E+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC MANAGEMENT BACKUP 28-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 备份管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 10.8 V ~ 13.2 V |
| 工作温度： | -20°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
Cache-Memory Battery-Backup Management IC
The MARGIN pin sets the CV threshold according to
I BATT
I IN
I L
the following formula:
V PK (CV Set Point) = 4.97V x R1/(R2 + R1)
Where R2 is the resistor between STMR and MARGIN,
and R1 is the resistor between MARGIN and ground.
Voltage regulation can be set from 3.8V to 4.6V. If the
safety timer expires during CV mode the charger enters
the fault state. A fault that occurs in CV mode, once
Q1
ON
Q2
ON
Q1
ON
Q2
ON
Q1
ON
Q2
ON
Q1
ON
Q2
ON
cleared, causes the charger to transition to done.
Charge resumes if/when the battery voltage collapses
I SWITCH (Q1)
I BATT
I SWITCH (Q2)
I BATT
Figure 5. Li+ Battery Charger CC Operation Characteristics
The current in the inductor is a combination of the cur-
rent in Q1 and Q2. The voltage on the inductor is higher
during Q1 ON than Q2 ON. This allows the current in
the inductor to remain continuous because the power-
in approximately equals the power-out.
Constant-Voltage (CV) Mode
CV mode is entered after CC mode when the battery
voltage reaches the CV output threshold. Battery volt-
age is measured at the BATT+ pin. When the voltage
reaches the CV threshold set by the MARGIN pin, regu-
lation goes from CC mode to CV mode. Charge termi-
nation occurs when the current drops below 5% of the
CC charge rate.
to 95% (V DELTA ) of the CV threshold.
Fault Conditions
There are several types of fault conditions that can
occur. The precondition timer or safety timer can expire
and the charger enters the fault state. This fault condi-
tion must be cleared by power cycling the part or tog-
gling ENC. If the temperate exceeds the hot or cold
limits, the charger enters fault. In the case of a temper-
ature fault, charging resumes once the temperature
returns to the normal operation range unless the fault
occurs in CV mode. If a fault occurs in CV mode, the
charger sees a charge termination condition because
the current has dropped below 5% x I CHG . Once the
fault condition is removed the charger transitions to
done. The charger remains in the done state unless the
cell voltage collapses below 95% (V DELTA ) of the CV
threshold.
Thermal Protection
The charger circuitry has a shutdown feature that paus-
es charging if the internal die temperature exceeds
160°C. Charging resumes after the temperature has
cooled 20°C below 160°C. The charger circuitry is also
equipped with a temperature choke point. If the die
temperature reaches 100°C, the CCCV charger begins
to choke the current 133mA/°C above 100°C. The
choke continues down to 0mA if the temperature con-
tinues to increase. These thermal-regulation features
operate independent of the thermistor input.
Enable Charger
The ENC pin is an active-high input that enables the
charger. When enabled, the DS2731 performs battery
qualification and begins charging using the CCCV
algorithm. Toggling ENC resets charge timers and
clears fault conditions. Any time ENC is low, the
DS2731 charging circuitry is disabled and the high-
side switch is guaranteed to be off. No current can flow
from the battery to the VIN pin when the charger is off.
12
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相关代理商/技术参数 |
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|---|---|
| DS2731EVKIT+ | 制造商:Maxim Integrated Products 功能描述:12V A DC/DC CONVERTER - Boxed Product (Development Kits) |
| DS2731K | 功能描述:电源管理IC开发工具 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 |
| DS2733E+ | 功能描述:电池管理 BBU Power IC 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 |
| DS2733E+T&R | 制造商:Maxim Integrated Products 功能描述:BBU POWER IC 20-TSSOP T&R LF - Tape and Reel |
| DS2733E+T&R | 功能描述:电池管理 BBU Power IC 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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