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參數(shù)資料
| 型號： | 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)： | 11/12頁 |
| 文件大?。?/td> | 210K |
| 代理商： | MAX1898EUB42 |
Selecting External Components
The MAX1898 drives an external transistor to control
charging current. The most important specifications for the
pass transistor (MOSFET or bipolar) are current rating and
package power dissipation. Since the MAX1898 operates
as a linear charger, heat will dissipate in the external tran-
sistor. The worst-case power dissipation will be:
P
DISS(MAX)
= I
FASTCHG
(V
IN
- 2.5V)
The pass transistor and heatsinking (typically an expand-
ed PC board plane) must be rated for P
DISS(MAX)
.
The pass device will most commonly be a P-channel
MOSFET. Its operating voltage must exceed the
expected input voltage, but MOSFET on-resistance is
important only in low-dropout designs where V
IN
is only
slightly higher than the battery regulation voltage. In
most charger designs, a fairly low-cost FET (around
100m
to 200m
R
DS(ON)
) performs more than ade-
quately. Lower resistance FETs perform well also, but
are not worth the added cost in this case.
A PNP bipolar transistor may also be used as a pass
device. DRV can sink up to 4mA, so reasonable high
current gain (h
FE
or Beta) is required to allow DRV to
drive the base of a bipolar pass transistor. For a 500mA
fast-charge current, an h
FE
of 125 is required. Although
their current gain is high, Darlington PNP transistors are
not recommended due to stability limitations.
If V
IN
is less than V
BATT
, the body diode inherent in the
external enhancement-mode FET allows current to flow
from the cell back to the source. To prevent this, add a
Schottky diode between the drain and BATT, as shown
in Figure 4.
Chip Information
TRANSISTOR COUNT: 1816
PROCESS: BiCMOS
M
Linear Charger for Single-Cell Li+ Battery
______________________________________________________________________________________
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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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