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参数资料
| 型号： | DS2731E+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/20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
Safety Timer
The charger has a safety timer that controls the maxi-
mum length of time for a charge cycle. It is user selec-
table from 1 to 10 hours. If this timer expires and the
battery has failed to reach the termination current, the
charger enters the fault state and is latched off.
Charging does not continue until either power is cycled
or the ENC pin is strobed low and then high again. The
timer does not start until CC mode is entered and con-
tinues through CV mode. Precharge mode is not includ-
ed in the STMR.
Timing Equation:
0.1647 x R STMR = t (in seconds); R STMR = R1 + R2
Where R1 is the resistor from MARGIN to ground and
R2 is the resistor from STMR to MARGIN.
Thermistor Input
Battery temperature can be monitored using an exter-
nal thermistor. The THM input goes to a comparator
and is pulled up internally by a 10k ? resistor. The volt-
age on this pin must be above V HYS-HOT and below
V HYS-COLD in order to start charging. Thermistor func-
tionality can be disabled by grounding the THM pin
and charging is independent of temperature. During
charging, if the voltage on the THM pin goes below
V HOT volts, the charger pauses until the voltage rises
above V HYS-HOT volts. Also, if the voltage on the THM
pin goes above V COLD volts, the charger pauses until
the voltage falls below V HYS-COLD volts. All timers
pause while charging is interrupted and resume when
the temperature returns to the valid range. The charger
enters the fault state when an overtemperature or
undertemperature condition occurs. A 10k ? NTC ther-
mistor is recommended for this pin.
Charge Status Indicators
The CHARGE, FAULT, and DONE pins can be used as
digital discretes or as LED drivers; they are open drain.
When charging, the CHARGE pin is held low. When the
charger detects a full battery/termination condition,
I TERMINATE , the DONE pin goes low and the CHARGE
pin goes high impedance. Any charging fault (overtem-
perature or expiration of the safety timer) causes the
FAULT pin to flash at a 4Hz rate and the CHARGE and
DONE pins go high impedance. The FAULT pin stays
on solid, not flash, if the fault occurs in CV mode.
Table 1. Thermistor Threshold
TEMPERATURE ( ° C)
THM THRESHOLD
COLD
HOT
DISABLE
RATIO OF C BIAS
0.739
0.283
0.030
THERMISTOR
RESISTANCE
(k )
27.040
4.925
—
SEMITEC 103AT-2
0
45
—
FENWAL
197-103LAG-A01
173-103LAF-301
4
42
—
Table 2. Charge Status Indicator Description
CONDITION
Precharge
Battery Charged
CHARGE PIN
Low
High-Z
DONE PIN
High-Z
Low
FAULT PIN
High-Z
High-Z
COMMENT
—
(Done)
50% DF, 4Hz rate; low if
Fault
High-Z
High-Z
Blinking
fault occurs during CV
mode.
Charger Disabled
High-Z
High-Z
High-Z
—
______________________________________________________________________________________
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| 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 |
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| 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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