参数资料
型号: MAX8804ZEVKIT+
厂商: Maxim Integrated Products
文件页数: 14/16页
文件大小: 0K
描述: KIT EVAL FOR MAX8804
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 1
主要目的: 电源管理,电池充电器
已用 IC / 零件: MAX8804
已供物品:
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
V IN(MIN) > 4.2V + I CHARGE(MAX) x R ON
where R ON is the input-to-BAT resistance (typically
0.55 Ω for DC or 0.65 Ω for USB). Failure to meet this
requirement results in an incomplete charge or
increased charge time.
Application Circuits
Stand-Alone Li+ Charger
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z pro-
vide a complete Li+ charging solution. The Typical
Application Circuit shows the MAX8804V/MAX8804W/
MAX8804Y/MAX8804Z as a stand-alone Li+ battery
charger. The LED indicates when either fast-charge or
prequalification has begun. When the battery is fully
charged, the LED turns off.
Microprocessor-Interfaced Li+ Charger
Figure 5 shows the MAX8804V/MAX8804W/MAX8804Y/
MAX8804Z as a μP-interfaced Li+ battery charger. The
μP drives SET to enable/disable DC/USB mode charg-
ing. CHG can be used to detect the charge status of a
battery.
Layout and Bypassing
Connect the input capacitors as close as possible to
the IC. Provide a large copper GND plane to allow the
exposed paddle to sink heat away from the IC. Connect
the battery to BAT as close as possible to the IC to pro-
vide accurate battery voltage sensing. Make all high-
current traces short and wide to minimize voltage
drops. A sample layout is available in the MAX8804Z
evaluation kit to speed designs.
SYSTEM I/O
AC
ADAPTER
1 μ F
DC
MAX8804V
MAX8804W
MAX8804Y
CHG
MAX8804Z
POK
USB PORT
1 μ F
USB
<USBPWR>
μ P
(DETBAT)
BAT
SET
Li+
2.2 μ F
GND
NOTE: ( ) FOR MAX8804V/MAX8804W
< > FOR MAX8804Y/MAX8804Z
Figure 5. Microprocessor-Interfaced Li+ Charger with the MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
14
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