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參數(shù)資料
| 型號： | ADP3808 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Efficiency Switch Mode Li-Ion Battery Charger |
| 中文描述： | 高效率開關模式鋰離子電池充電器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 315K |
| 代理商： | ADP3808 |
ADP3808
THEORY OF OPERATION
The ADP3808 combines a bootstrapped synchronous switching
driver with programmable current control and accurate final
battery voltage control in a constant-current, constant-voltage
(CCCV) Li-Ion battery charger. High accuracy voltage control
is needed to safely charge Li-Ion batteries, which are typically
specified at 4.2 V ± 1% per cell. For a typical notebook computer
battery pack, three or four cells are in series, giving a total
voltage of 12.6 V or 16.8 V. The ADP3808 allows the final
battery voltage to be programmed. The programmable range is
4.0 V to 4.5 V per cell. The total number of cells to be charged
can be set to either 3 or 4 via a control pin.
Another requirement for safely charging Li-Ion batteries is
accurate control of the charge current. The actual charge current
depends on the number of cells in parallel within the battery
pack. Typically, this is in the range of 2 A to 3 A. The ADP3808
provides flexibility in programming the charge current over a
wide range. An external resistor is used to sense the charge
current. The charge current can be set by programming the
sense resistor voltage drop. The voltage drop can be set to a
maximum of 96 mV. This programmability allows the current
to be changed during charging. For example, the charge current
can be reduced for trickle charging.
The synchronous driver provides high efficiency when charging
at high currents. Efficiency is important mainly to reduce the
amount of heat generated in the charger, but also to stay within
the power limits of the ac adapter. With the addition of a boot-
Rev. 0 | Page 10 of 16
strapped high-side driver, the ADP3808 drives two external
power NMOS transistors for a simple, lower cost power stage.
The ADP3808 also provides an uncommitted current sense
amplifier. This amplifier provides an analog output pin for
monitoring the current through an external sense resistor. The
amplifier can be used anywhere in the system that high-side
current sensing is needed. The sense amplifier output is compared
to a programmable voltage limit. If the limit is exceeded, the
LIMIT pin is asserted. The system sense amplifier is also used
to detect the presence of an ac adaptor. If the adaptor is detected,
the ADP3808 asserts a logic pin to signal the detection.
SETTING THE CHARGE CURRENT
The charge current is measured across an external sense
resistor, R
CS
, between the CSP and CSM pins. The input
common-mode range is from ground to V
CC
, allowing current
control in short-circuit and low dropout conditions. The voltage
between CSP and CSM is programmed by a ratio of the voltages
at CSADJ and REFIN according to Equation 1.
CSADJ
V
V
CSM
CSP
mV
96
REFIN
=
(1)
For example, using a 20 mΩ sense resistor gives a range from
150 mA with CSADJ = REFIN/32 to 4.8 A maximum when
CSADJ = REFIN.
The power dissipation in R
CS
should be kept below 500 mW.
Components R4 and C13 provide high frequency filtering for
the current sense signal.
相關PDF資料 |
PDF描述 |
|---|---|
| ADP3808JCPZ | High Efficiency Switch Mode Li-Ion Battery Charger |
| ADP3808JCPZ-RL | High Efficiency Switch Mode Li-Ion Battery Charger |
| ADP3810AR-42 | Circular Connector Cable Assembly; Connector Type A:Circular Receptacle; Connector Type B:Stripped End Leads; Cable Length:10ft RoHS Compliant: Yes |
| ADP3810AR-12.6 | IC-OFF-LINE BATT.CHARGER |
| ADP3810AR-84 | Secondary Side, Off-Line Battery Charger Controllers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3808A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Efficiency Switch Mode Li-Ion Battery Charger |
| ADP3808AJCPZ-RL | 制造商:ON Semiconductor 功能描述: |
| ADP3808JCPZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Efficiency Switch Mode Li-Ion Battery Charger |
| ADP3808JCPZ-RL | 功能描述:IC CTRLR LI-ION CHARGER 24LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| ADP3810 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Secondary Side, Off-Line Battery Charger Controllers |
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