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參數(shù)資料
| 型號(hào)： | MAX1898EUB42 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Linear Charger for Single-Cell Li Battery |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | MICRO MAX PACKAGE-10 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 210K |
| 代理商： | MAX1898EUB42 |
M
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
conditions are met (see Figure 6):
An external power source is connected AND the cell
voltage is above 2.5V.
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.
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:
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
I
V
R
FASTCHG
SET
=
1400
Linear Charger for Single-Cell Li+ Battery
6
_______________________________________________________________________________________
Pin Description
PIN
NAME
IN
CHG
FUNCTION
1
2
Sense Input. Detects power source; positive side of internal current-sense resistor.
Open-Drain LED Driver. See Table 1 for
CHG
output states.
3
EN/OK
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.
4
ISET
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.
5
CT
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.
6
RSTRT
7
8
9
BATT
GND
DRV
10
CS
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| MAX1898EUB42+ | 功能描述:電池管理 Linear Charger for 1-Cell Li+ Battery RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1898EUB42+T | 功能描述:電池管理 Linear Charger for 1-Cell Li+ Battery RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1898EUB42-T | 功能描述:電池管理 Linear Charger for 1-Cell Li+ Battery RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1898EVKIT | 功能描述:電池管理 Evaluation Kit for the MAX1898 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX189ACPA | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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