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参数资料
| 型号： | ADM1087AKSZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC SIMPLE SEQUENCER OD SC70-6 |
| 标准包装： | 1 |
| 系列： | Simple Sequencers® |
| 类型： | 序列发生器 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP，SC-88，SOT-363 |
| 供应商设备封装： | SC-70-6 |
| 包装： | 标准包装 |
| 产品目录页面： | 788 (CN2011-ZH PDF) |
| 配用： | EVAL-ADM1087EBZ-ND - BOARD EVALUATION FOR ADM1087 |
| 其它名称： | ADM1087AKSZ-REEL7DKR |
ADM1085/ADM1086/ADM1087/ADM1088
DUAL LOFO SEQUENCING
A power sequencing solution for a portable device, such as a
PDA, is shown in Figure 27. This solution requires that the
SIMULTANEOUS ENABLING
The enable output can drive multiple enable or shutdown
regulator inputs simultaneously.
microprocessor power supply turn on before the LCD display
turns on, and that the LCD display power-down before the
12V
3.3V
microprocessor powers down. In other words, the last power
supply to turn on is the first one to turn off (LOFO).
SD
IN
ADP3333
OUT
3.3V
3.3V
SD
IN
ADP3333
OUT
2.5V
An RC network connects the battery and the SD input of the
V CC
ADP3333 voltage regulator. This causes power-up and power-
down transients to appear at the SD input when the battery is
V IN ENOUT
ADM1085
12V
connected and disconnected. The 3.3 V microprocessor supply
turns on quickly on power-up and turns off slowly on power-
ENIN
CEXT
SD
IN
ADP3333
OUT
1.8V
down. This is due to two factors: Capacitor C1 charges up to
9 V on power-up and charges down from 9 V on power-down,
and the SD pin has logic high and logic low input levels of 2 V
and 0.4 V.
For the display power sequencing, the ADM1085 is equipped
with Capacitor C2 to create the delay between the micro-
processor and display power turning on. When the system is
powered down, the ADM1085 turns off the display power
immediately, while the 3.3 V regulator waits for C1 to discharge
to 0.4 V before switching off.
ENABLE
CONTROL
Figure 28. Enabling a Pair of Regulators from a Single ADM1085
POWER GOOD SIGNAL DELAYS
Sometimes sequencing is performed by asserting power good
signals when the voltage regulators are already on, rather than
sequencing the power supplies directly. In these scenarios, a
simple sequencer IC can provide variable delays so that
enabling separate circuit blocks can be staggered in time.
For example, in a notebook PC application, a dedicated
SYSTEM
POWER SWITCH
9V
microcomputer asserts a power good signal for North Bridge?
and South Bridge? ICs. The ADM1086 delays the South Bridge
SD ADP3333 2.5V
MICROPROCESSOR
POWER
signal, so that it is enabled after the North Bridge.
9V
C1
5V
5V
3.3V
V IN
ENOUT
ADM1086
9V
SD ADP3333 5V
DISPLAY
POWER
MICROCOMPUTER
POWER_GOOD
EN
NORTH
BRIDGE
IC
ENIN
CEXT
C2
3.3V
5V
SYSTEM
POWER
9V
V IN ENOUT
ADM1086
ENIN CEXT
EN
SOUTH
BRIDGE
IC
0V
9V
V C1
MICROPROCESSOR
POWER
DISPLAY
POWER
0V
2.5V
0V
5V
0V
Figure 29. Power Good Delay
Figure 27. Dual LOFO Power-Supply Sequencing
Rev. A | Page 13 of 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM1088 | 制造商:AD 制造商全称:Analog Devices 功能描述:Simple Sequencers in 6-Lead SC70 |
| ADM1088AKS | 制造商:Analog Devices 功能描述: |
| ADM1088AKS-REEL7 | 功能描述:IC SIMPLE SEQUENCER P-P SC70-6 RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:Simple Sequencers® 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:低有效 复位超时:标准传输延迟为 60 µs 电压 - 阀值:3V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:Digi-Reel® 其它名称:LM8364BALMF30DKR |
| ADM1088AKS-U1 | 制造商:Analog Devices 功能描述:- Bulk |
| ADM1088AKSZ-REEL7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Simple Sequencers in 6-Lead SC7 |
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