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参数资料
| 型号： | DS2714E+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC NIMH CHARGER QUAD 20TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 镍金属氢化物 |
| 电源电压： | 4 V ~ 5.5 V |
| 工作温度： | -20°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
DS2714: Quad Loose Cell NiMH Charger
DETAILED DESCRIPTION
CHARGE ALGORITHM OVERVIEW
A charge cycle begins in one of three ways: With the application of power to the DS2714 with cell(s) already
inserted, with the detection of cell insertion after power-up, or when exiting suspend mode with cell(s) inserted. The
charge cycle begins with Pre-charge qualification to prevent Fast charging of deeply depleted cells or charging
under extreme temperature conditions. Pre-charging is performed at a reduced rate until the cell being charged
reaches V BAT-LOW (1V). The algorithm proceeds to a Fast charge phase which includes cell tests to avoid accidental
charging of alkaline cells or NiMH cells which are worn-out or damaged. Fast charging continues as long as the cell
temperature is less than 50°C (based on Thermistor sensors THM 1, 2), the open circuit cell voltage(s) are
between V BAT-LOW (1.0V) and V BAT-MAX1 (1.65V) and the closed ciruit cell voltage(s) are less than V BAT-MAX2 (1.75V).
Fast charging terminates by the - Δ V (negative delta voltage) or flat voltage method. The Top-Off charge phase
follows to completely charge the cell. After the Top-off charge timer expires, the Maintenance charge phase
continues indefinitely to keep the cells fully charged. Maximum voltage, temperature and charge time monitoring
during all charge phases act as secondary or safety termination methods to provide additional protection from
overcharge. A cell voltage greater than V BAT-MAX2 (1.75V) will result in a fault condition, and temperature greater
than 50°C (see Table 1) will result in either Fault or Maintenance depending on which charge state the device was
last in. Each cell is monitored independently, and the charge phase of each cell is independently controlled. If a cell
is removed while being charged, the algorithm for that cell slot is completely reset to its Presence Test state without
affecting the charge control states of the other cells.
CHARGE CONFIGURATION
The DS2714 supports four slot standalone chargers. It alternates charge to the four slots every two seconds, with
one half second available to each cell. Removal or insertion of a cell into the charger does not disturb the charge
timing or charge rates of the other cells. Charge pulses are fed alternately to each cell under the control of the CCx
pins so that the charge regimes occur in parallel. The duty cycle on the CCx pins are completely independent of
one another. Transitions from Pre-charge to Fast charge, Fast charge to Top-off and Top-off to Maintenance occur
independently for each cell. The configuration shown in Figure 3 is for charging four cells with a current limited
source of 2A. The effective average fast charge current for each cell is 2A x 0.25 x 15/16 = 0.469A. The 15/16 term
is due to the fact that every 16 th charge time slot is used for negative delta-voltage and impedance testing. No
current is delivered to the cell during that time. Mechanical design of the holders is required to prevent insertion of
more than one cell in each slot. The holder design should also prevent electrical contact with reverse polarity
insertion.
PERFORMANCE REQUIREMENTS OVER TEMPERATURE AND VOLTAGE
Valid NiMH
Charge Range
Below Operating
Voltage Range
Low
Temperature
Range
High
Abs. Max
Operating
Range
Temperature
Range
INTERNAL OSCILLATORS AND CLOCK GENERATION
An internal oscillator provides the main clock source used to generate timing signals for internal chip operation. The
pre-charge timer, hold-off timers, and duty factors for the charging operations are derived from this timebase. There
are two separate timers for the impedance test and Fast Charge/Topoff functions.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2714EVKIT+ | 制造商:Maxim Integrated Products 功能描述:DS2714 EVAL KIT - Boxed Product (Development Kits) |
| DS2714K | 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 |
| DS2715 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:NiMH Battery Pack Charge Controller |
| DS2715BZ+ | 功能描述:电池管理 NiMH Battery Pack Charge Controller 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 |
| DS2715BZ+T&R | 制造商:Maxim Integrated Products 功能描述:NIMH BATPCK CHGCONT 16PIN SOIC TR L - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CTRLR CHRG NIMH BATT 16-SOIC 制造商:Maxim Integrated Products 功能描述:Battery Management NiMH Battery Pack Charge Controller |
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