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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)： | 8/12頁 |
| 文件大?。?/td> | 210K |
| 代理商： | MAX1898EUB42 |
M
the ISET pin is 1mA per amp of charging current. The
output voltage at ISET is proportional to charging cur-
rent as follows:
The voltage at ISET is nominally 1.4V at the selected
fast-charge current, and falls with charging current as
the cell becomes fully charged. See Figure 2 for typical
Li+ charging profile.
CHG
Status Output
CHG
is an open-drain output that monitors the cell
’
s
charging status.
CHG
has a 5mA current limit so an
LED can be connected directly from IN to
CHG
for a
visible indication. Alternatively, a pullup resistor (typi-
cally 100k
) to a logic supply provides a logic-level
output. Table 1 outlines the status of
CHG
for various
charger states.
Reinitiating a Charging Cycle
The MAX1898 can be configured so that a charging
cycle automatically restarts when the cell voltage drops
200mV below the battery regulation voltage (connect
RSTRT to GND). The restart threshold can also be low-
ered by connecting an external resistor between RSTRT
and GND. If automatic charging restart is not desired,
this feature may be disabled by floating the RSTRT pin.
With restart disabled, charging can only be reinitiated
by pulling EN/OK low, or by removing and reapplying
the input power source.
EN/OK (EN Input, OK Output)
The EN/OK pin serves two functions. It primarily serves as
a logic input (active high) to enable the charger. In addi-
tion to ON/OFF control, EN/OK also indicates when input
power is connected. When input power is applied to IN
(V
IN
> V
BATT
and V
IN
> 4.25V) EN/OK pulls high (to 3V)
with a 100k
internal pullup resistance. Consequently,
EN/OK may be output to a logic input, to indicate AC
adapter presence, but at the same time may be driven by
open-drain logic to turn the charger ON and OFF. An
open-drain logic-low input will over-ride the internal pullup
resistor and turn off the charger (see Figure 3). When the
open drain goes high impedance, EN/OK will go high if
V
I
R
ISET
CHG
SET
=
×
1000
Linear Charger for Single-Cell Li+ Battery
8
_______________________________________________________________________________________
CONDITION
CHG
No battery or no charger input.
The cell voltage is less than 2.5V and charge current is regulated to 10% of the selected fast-
charge current (prequalification state).
High impedance (LED off)
Low impedance (LED on)
Cell voltage is greater than 2.5V (fast-charge state).
Charge cycle complete
—
charge current is less then 20% of the selected fast charge current or
safety timer expires (3 hours for C
CT
= 100nF).
Charge cycle fault
—
the cell voltage is less than 2.5V and the prequalification timer (45min for C
CT
= 100nF) has expired.
Low impedance (LED on)
High impedance (LED off)
Blinking, LED on 50% duty
factor, 1.5Hz
Table 1.
CHG
Output States
OFF
MAX1898
ON
POWER OK
IN
GND
EN/OK
3V
100k
OPEN-DRAIN
LOGIC
Figure 3. Driving EN/OK with Open-Drain Logic to Retain
ON/OFF Control with Power OK Indication
3.2
3.4
3.8
3.6
4.0
4.2
0
0.2
0.4
0.6
1.0
0.8
1.2
1.4
0
60
TIME (MINUTES)
30
90
120
150
180
B
A
BATTERY VOLTAGE
AMP HOURS
BATTERY CURRENT
POWER DISSIPATION
Figure 2. Li+ Charging Profile
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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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