参数资料
| 型号： | SC810ULTRT |
| 厂商： | Semtech |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC810ULDKR |
SC810
Applications Information (continued)
D BYPASS
Opt.
Q ISO
Device
SC810
R ISO_PD
Load
V ADAPTER/USB
VIN
ENB
2.2 μ F
STATB
GND
BAT
IPRGM
R IPRGM
2.2 μ F
Figure 7 — Battery Isolation and Power Path Bypass, Powering the Load Directly From the Charging Adapter
When the charging source is present, the p-channel
MOSFET battery isolation switch Q ISO source-to-gate
voltage V SG is equal to minus the D BYPASS forward-biased
voltage drop, ensuring that the switch Q ISO is off (open).
When the charging source is removed, the MOSFET gate is
pulled down to ground by R ISO_PD , closing the battery isola-
tion switch and connecting the battery to the load.
When the charging source is removed, the turn-on of Q ISO
could be delayed due to its gate capacitance. If so, the
substrate PN diode of Q ISO will become forward biased,
holding the load voltage to within 0.7V of the battery
voltage until V SG > V TH , turning on Q ISO . This momentary
voltage drop can be mitigated by the use of an optional
Schottky diode in parallel with Q ISO , as shown.
With the load isolated from the battery, the charging
adapter must supply both the load current and the charg-
ing current. If the sum of these should ever exceed the
current capacity of the adapter, V ADAPTER will be pulled
down. Current limited adapter operation of the SC810
ensures charge cycle integrity if the device load pulls the
adapter voltage down to the battery voltage plus charger
dropout voltage at the CC current, or even deeper into
dropout if necessary to further reduce the charge current
to power the device load.
To better understand the trade-offs between charger
bypass and direct connection of the load to the battery,
see the Semtech Application Note AN–PM–0802, Tradeoffs
Between Direct Battery Connection vs. Bypassing the
Charger .
Capacitor Selection
Low cost, low ESR ceramic capacitors such as the X5R and
X7R dielectric material types are recommended. The BAT
pin capacitor should be at least 1μF, but can be as large as
desired to accommodate the required input capacitors of
regulators connected directly to the battery terminal. BAT
pin total capacitance must be limited if the SC810 is to be
operated without the battery present. See the section
Operation Without a Battery. The VIN pin capacitor is typi-
cally between 0.1μF and 2.2μF, although larger values will
not degrade performance. Capacitance must be evalu-
ated at the expected bias voltage (4.2V for the BAT pin
capacitor, the expected V VIN supply regulation voltage for
the VIN pin capacitor), rather than the zero-volt capaci-
tance rating.
PCB Layout Considerations
Layout for linear devices is not as critical as for a switching
regulator. However, careful attention to detail will ensure
reliable operation.
Place input and output capacitors close to
the device for optimal transient response
and device behavior.
Connect all ground connections directly
to the ground plane. If there is no ground
plane, connect to a common local ground
point before connecting to board ground
near the GND pin.
Attaching the part to a larger copper
footprint will enable better heat transfer
from the device, especially on PCBs with
internal ground and power planes.
18
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| SC811ULTRT | 功能描述:IC BATTERY MANAGEMENT RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:* 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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