参数资料
| 型号： | SC806IMLTRT |
| 厂商： | Semtech |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC LI-ION BATT CHARGER 10-MLP |
| 标准包装： | 1 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 电源电压： | 3.15 V ~ 6.3 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 供应商设备封装： | 10-MLP-EP（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1359 (CN2011-ZH PDF) |
| 其它名称： | SC806IMLDKR |
SC806
POWER MANAGEMENT
CHRGB LED Flag
The CHRGB LED driver on the SC806 can be used to
drive an LED and/or signal the system processor.
CHRGB=Low (Charging) and CHRGB=High-Z (Charge Com-
plete). The CHRGB output will be high impedance when
the VCC is in a UV condition. The Table below defines the
CHRGB LED output states.
CPB LED Flag
The CPB LED driver on the SC806 is used to indicate
that the adapter voltage is present at the input to the
SC806. The CPB output is an active low output when
the input voltage is greater than 3V. This feature is ac-
tive regardless of the state of the DIS pin.
L E D
C H R G B
L o w
I o u t >
t e r m
H i g h - Z
I o u t <
t e r m
B l i n k i n g
O V o r O T
F a u l t
Layout Guidelines
The two most critical aspects of the pcb layout are the
power path and thermal layout. The power path starts
at the Adapter + input and runs to the VCC input of the
The CHRGB output signifies the charging status. When
the output current is > Itermination, CHRGB=low. CHRGB
is high impedance when Iout is < Itermination. The
CHRGB output is latched high-Z at the end of the charge
cycle when the output current is less than Itermination.
The CHRGB output will remain high until the battery en-
ters a recharge cycle, or if EN, or VCC are toggled.
.
There are three fault modes detected by the SC806;
(Input under voltage, input over voltage, and Max die tem-
perature or OT). The LED states for these fault modes
are shown below.
SC806, then from the Vout pin of the SC806 to the Bat-
tery + terminal, and completes with the return trace from
the battery - terminal to the adapter - input. All of these
traces need to be designed to handle the required charg-
ing current. The trace from Vout of the SC806 is most
critical and should be made as wide as possible to
minimze IR drops between the regulated voltage at the
SC806 vout pin and the battery terminal. Keep the
Adapter+ to SC806 VCC input trace wide to minimize
voltage drops that will add to the dropout voltage capa-
bility of the SC806. The GND pin of the SC806 should
be connected in a kelvin fashion at the Battery terminal
to eliminate voltage drops in the return path reducing
F a u l t
V C C U V L O
V C C O V P
T j > 1 5 0 o C
C H R G B
H i g h - Z
B l i n k i n g
B l i n k i n g
the regulated battery voltage.
The themal performance of the SC806 package requires
a low impedance connection from the heat slug on the
bottom of the package to an external ground plane. This
is best accomplished by using a single large via under
the device connected to a ground plane on the bottom
exposed side of the pcb. The evaluation board uses 1
Overcurrent and Max Temperature Protection
Overcurrent protection is inherent in all modes of opera-
tion. When the device is in charge-mode the output is
current limited to either the pre-charge current limit value
or the fast charge current limit value depending on the
voltage at the output. Max die temperature protection is
included on the SC806. This feature allows the SC806
to operate with maximum power dissipation by disabling
the output current when the die temperature reaches
OT. The result is that the SC806 will operate as a pulse
charger in extreme power dissipation applications deliv-
ering the maximum allowable output current while regu-
lating the internal die temperature to a safe level.
square inch of copper on the bottom of the pcb and is
capable of 1A charging current.
The input and output bulk decoupling capacitors for the
SC806 should be placed near the external terminals for
the adpater and battery. This short low impedance loop
is for the high current spikes that result from input/out-
put hot-plugging of the charger. To minimize these cur-
rent spikes should be minimized. A typical application
requires a 0.1μF input/output capacitor. If the distance
from the external terminals to the SC806 is greater than
1”, 0.1μ local decoupling capacitors at the SC806 may
be required.
? 2004 Semtech Corp.
7
www.semtech.com
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