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參數(shù)資料
| 型號： | ISL88731 |
| 廠商： | Intersil Corporation |
| 英文描述： | SMBus Level 2 Battery Charger |
| 中文描述： | 2級的SMBus電池充電器 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大小： | 474K |
| 代理商： | ISL88731 |
14
FN9258.0
November 20, 2006
Setting Input-Current Limit
The total power from an AC adapter is the sum of the power
supplied to the system and the power into the charger and
battery. When the input current exceeds the set input current
limit, the ISL88731 decreases the charge current to provide
priority to system load current. As the system load rises, the
available charge current drops linearly to zero. Thereafter, the
total input current can increase to the limit of the AC adapter.
The internal amplifier compares the differential voltage
between CSSP and CSSN to a scaled voltage set by the
InputCurrent register. The total input current is the sum of
the device supply current, the charger input current, and the
system load current. The total input current can be estimated
as follows:
Where
η
is the efficiency of the DC/DC converter (typically
85% to 95%).
The ISL88731 has a 16-bit InputCurrent register that
translates to a 2mA LSB and a 131.071A full scale current
using a 10m
Ω
current-sense resistor (RS1 in Figure 2).
Equivalently, the 16-bit InputCurrent number sets the voltage
across CSSP and CSSN inputs in 20μV per LSB increments.
To set the input current limit use the SMBus to write a 16-bit
InputCurrent register using the data format listed in Table 4.
The InputCurrent register uses the Write-Word protocol (see
Figure 18). The register code for InputCurrent is 0x3F
(0b00111111). The InputCurrent register can be read back to
verify its contents.
The ISL88731 ignores the first 7 LSBs and uses the next
6 bits to control the input-current DAC. The input-current
range of the ISL88731 is from 256mA to 11.004A. All 16-bit
numbers requesting input current above 11.004A result in an
input-current setting of 11.004A. All 16-bit numbers
requesting input current between 0mA to 256mA result in an
input-current setting of 0mA. The default input-current-limit
setting at POR is 256mA. When choosing the current-sense
resistor RS1, carefully calculate its power rating. Take into
account variations in the system’s load current and the
overall accuracy of the sense amplifier. Note that the voltage
drop across RS1 contributes additional power loss, which
reduces efficiency. System currents normally fluctuate as
portions of the system are powered up or put to sleep.
Without input current regulation, the input source must be
able to deliver the maximum system current and the
maximum charger-input current. By using the input-current-
limit circuit, the output-current capability of the AC wall
adapter can be lowered, reducing system cost.
I
INPUT
I
SYSTEM
I
CHARGE
V
BATTERY
×
(
)
V
IN
η
×
(
)
[
]
+
=
(EQ. 2)
TABLE 4. INPUT CURRENT (REGISTER 0x3F) (10m
Ω
SENSE RESISTOR, RS1)
BIT
BIT NAME
DESCRIPTION
0
Not used.
1
Not used.
2
Not used.
3
Not used.
4
Not used.
5
Not used.
6
Not used.
7
Input Current, DACS 0
0 = Adds 0mA of input current.
1 = Adds 256mA of input current.
8
Input Current, DACS 1
0 = Adds 0mA of input current.
1 = Adds 512mA of input current.
9
Input Current, DACS 2
0 = Adds 0mA of input current.
1 = Adds 1024mA of input current.
10
Input Current, DACS 3
0 = Adds 0mA of input current.
1 = Adds 2048mA of input current.
11
Input Current, DACS 4
0 = Adds 0mA of input current.
1 = Adds 4096mA of input current.
12
Input Current, DACS 5
0 = Adds 0mA of input current.
1 = Adds 8192mA of input current, 11004mA max.
13
Not used.
14
Not used.
15
Not used.
ISL88731
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL88731AHRZ | 功能描述:電池管理 ISL88731A NOTEBOOK BATRY CHRGRRE-BRAND 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 |
| ISL88731AHRZ | 制造商:Intersil Corporation 功能描述:IC BATTERY CHARGER LI-ION 8A TQFN-28 |
| ISL88731AHRZ-T | 功能描述:IC BATTERY CHRGR SMBUS 28-TQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| ISL88731CEVAL2Z | 功能描述:EVALUATION BOARD ISL88731 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| ISL88731CHRTZ | 制造商:Intersil Corporation 功能描述:PB-FREE ISL88731C NOTEBOOK BATTERY CHARGER (P6 SHRINK) - Rail/Tube 制造商:Intersil 功能描述:ISL88731C NOTEBOOK BATRY CHRGRP6 SHRINK |
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