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参数资料
| 型号： | MAX1898EUB41+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI+ SNGL 10-UMAX |
| 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： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.5 V ~ 12 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 带卷 (TR) |
Linear Charger for Single-Cell Li+ Battery
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
IN
CHG
EN/OK
ISET
CT
RSTRT
BATT
GND
DRV
CS
FUNCTION
Sense Input. Detects power source; positive side of internal current-sense resistor.
Open-Drain LED Driver. See Table 1 for CHG output states.
Logic-Level Enable Input and Input Power OK Output. Hold low to disable charger. Float for normal
operation, drive with an open-drain device to utilize both pin functions, or connect through 10k ? for logic-
controlled ON/OFF. See the EN/OK (EN Input, OK Output) section for details.
ISET serves two functions. It provides an analog output proportional to the actual charge current. Output
current from ISET is 1mA per amp of battery charging current. The charging current is set by connecting a
resistor from ISET to ground. See the Current-Limit Mode section.
Safety Charge Timer Control. Connect timer capacitor to program safety time-out interval; 100nF for
approximately three hours. Connect to GND to disable the timer function.
Automatic-Restart Control Pin. When tied to GND, a new charging cycle starts if the cell drops 200mV below
the battery regulation threshold. The restart threshold may be lowered by connecting a resistor from RSTRT
to ground. See the Reinitiating a Charging Cycle section . Automatic restart is disabled when RSTRT is
unconnected or when CT is grounded (timer disabled).
Battery Sense Input. Positive terminal of single Li+ cell.
Ground
External Transistor Driver. This pin drives the gate/base of an external PMOS/PNP pass transistor.
Current-Sense Input. Negative side of internal current-sense resistor. Connect to source/emitter of
PMOS/PNP pass transistor.
Detailed Description
The MAX1898 forms a complete charger for 1-cell Li+
batteries. It includes precision voltage control (±0.75%)
to optimize both cell performance and cycle life.
Factory-set 4.2V (MAX1898EUB42) and 4.1V
(MAX1898EUB41) versions charge all common Li+
chemistries. Externally selectable charge current is
sensed internally, eliminating the need for a current-
sense resistor. The charger also supplies outputs that
indicate charge status ( CHG ), the presence of input
power (EN/OK), and charge-current magnitude (ISET).
Other features include a shutdown control input
(EN/OK), selectable threshold for charge-cycle restart
without cycling input power (RSTRT), and a selectable
charge termination safety timer. See Figure 1.
The MAX1898 initiates fast charge when any of these
? The prequalification cycle ends with the cell reaching
2.5V.
Li+ cells can be damaged when fast-charged from a
completely dead state. A fully discharged cell may indi-
cate an abnormal cell condition. As a built-in safety fea-
ture, the MAX1898 prequalifies the cell with 10 percent
of the user-programmed fast-charge current at the start
of a charge cycle. When the cell voltage rises to 2.5V,
the MAX1898 begins fast-charging.
Current-Limit Mode
The MAX1898 regulates charging current by linearly
controlling an external PMOS or PNP transistor. The
maximum charging current is programmed by an exter-
nal RSET resistor connected from ISET to GND. Select
the RSET value based on the following formula:
conditions are met (see Figure 6):
? An external power source is connected AND the cell
voltage is above 2.5V.
I FASTCHG =
1400V
R SET
? The cell voltage falls to the restart threshold, 4.0V in
the MAX1898EUB42, or 3.9V for the MAX1898EUB41.
? The IC is reset by driving the EN/OK pin low and
then high again.
where:
I FASTCHG is in amps and RSET is in ohms.
The ISET pin may also be used to monitor the actual
charging current at any time. The output current from
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1898EUB42 | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB42+ | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB42+T | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB42-T | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX1898 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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