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| 型号： | ADP8863ACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/52页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHIT BCKLGT 20-WLCSP |
| 标准包装： | 1 |
| 拓扑： | 切换式电容器（充电泵） |
| 输出数： | 7 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，LED 闪烁器 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 800kHz ~ 1.32MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 4.3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-UFBGA，WLCSP |
| 供应商设备封装： | 20-WLCSP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | ADP8863ACPZ-R7DKR |
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ADP8863
Soft Start Feature
At startup (either from UVLO activation or fault/standby
recovery), the output is first charged by I SS (3.75 mA typical)
until it reaches about 92% of V IN . This soft start feature reduces
the inrush current that is otherwise present when the output
capacitance is initially charged to V IN . When this point is
reached, the controller enters G = 1× mode. If the output
voltage is not sufficient, then the automatic gain selection
determines the optimal point as defined in the Automatic Gain
Selection section.
OPERATING MODES
There are four different operating modes: active, standby,
shutdown, and reset.
Active Mode
In active mode, all circuits are powered up and in a fully
operational state. This mode is entered when Bit nSTBY (in
Register MDCR) is set to 1.
Standby Mode
Standby mode disables all circuitry except for the I 2 C receivers.
Current consumption is reduced to less than 1 μA. This mode is
entered when the nSTBY bit is set to 0 or when the nRST pin is
held low for more than 100 μs (maximum). When standby is
exited, a soft start sequence is performed.
SHUTDOWN
Shutdown Mode
Shutdown mode disables all circuitry, including the I 2 C receivers.
Shutdown occurs when V IN is below the undervoltage thresholds.
When V IN rises above V IN(START) (2.05 V typical), all registers are
reset and the part is placed into standby mode.
Reset Mode
In reset mode, all registers are set to their default values and
the part is placed into standby. There are two ways to reset the
part: by power-on reset (POR) or using the nRST pin. POR is
activated any time that the part exits shutdown mode. After a
POR sequence is complete, the part automatically enters
standby mode.
After startup, the part can be reset by pulling the nRST pin low.
As long as the nRST pin is low, the part is held in a standby
state, but no I 2 C commands are acknowledged (all registers are
kept at their default values). After releasing the nRST pin, all
registers remain at their default values, and the part remains in
standby; however, the part does accept I 2 C commands.
The nRST pin has a 50 μs (typical) noise filter to prevent inad-
vertent activation of the reset function. The nRST pin must be
held low for this entire time to activate reset.
The operating modes function according to the timing diagram
in Figure 28.
V IN
STANDBY
nRST
V IN CROSSES ~2.05V AND TRIGGERS POWER-ON RESET
BIT nSTBY IN REGISTER
MDCR GOES LOW
~100μs DELAY BETWEEN POWER-UP AND
WHEN I 2 C COMMANDS CAN BE RECEIVED
25μs TO 100μs NOISE FILTER
nRST MUST BE HIGH FOR 20μs (MAX)
BEFORE SENDING I 2 C COMMANDS
nRST IS LOW, WHICH FORCES STANDBY
LOW AND RESETS ALL I 2 C REGISTERS
V OUT
V IN
~3.75mA CHARGES
V OUT TO V IN LEVEL
1×
1.5×
2×
GAIN CHANGES OCCUR ONLY WHEN NECESSARY,
BUT HAVE A MIN TIME BEFORE CHANGING
SOFT START
10μs 100μs
SOFT START
Figure 28. Typical Timing Diagram
Rev. A | Page 13 of 52
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