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| 型号： | LTC2928IUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/32页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY SEQUENCER 38-QFN |
| 标准包装： | 2,500 |
| 类型： | 序列发生器 |
| 监视电压数目： | 4 |
| 复位： | 低有效 |
| 复位超时： | 最小为 5 ms |
| 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： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 带卷 (TR) |
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LTC2928
APPLICATIO S I FOR ATIO
Fault Detection
The LTC2928 has sophisticated fault detection circuitry
which can detect:
? Stalled supplies (with power good timer enabled)
during sequencing
? Under or overvoltage supplies
? System controller command errors
? Externally commanded faults
If any of the above faults are detected, the LTC2928
immediately pulls the EN1 through EN4 outputs low,
turning off all enabled supplies.
In order to clear the fault condition within the LTC2928,
the following conditions must exist:
? All sequenced supplies must be below their sequence-
down thresholds
? The ON input must be below 0.97V
? The FLT pin must be externally released
Sequencing Faults
Reset Faults
Use the MS1 and MS2 configuration pins to select whether
or not the system should fault if any monitored input falls
below its undervoltage threshold. A reset fault may only
occur after the LTC2928 comes out of reset for the first
time after sequencing. All enable outputs and FLT are
pulled low.
External Faults
An external fault is generated by pulling the FLT pin low.
Tie the OV pin to FLT to generate overvoltage faults. In
applications using multiple LTC2928s, tie all the FLT pins
together to ensure proper re-sequencing. Upon detecting
an external fault, all enable outputs are pulled low.
Fault Reporting Map
For diagnostic purposes, fault information is latched to
the comparator outputs after a fault. The table below
provides a map to the available fault information. The fault
information remains latched until the LTC2928 completes
the next sequence-up operation.
Table 5. Fault Reporting
The LTC2928 keeps track of power supplies that need to
exceed their sequencing thresholds within the configured
power good time during the sequence-up and sequence-
down phases. Should any supply fail this test a sequence
fault is generated. All enable outputs and FLT are pulled low.
System Controller Command Faults
After the sequence-up phase has begun (ON input high),
the ON input must remain above 1V until DONE pulls
low (sequence-up complete). Pulling ON low before the
sequence-up process is complete is considered a command
fault. All enable outputs and FLT are pulled low.
Fault Type
Sequence Fault
Reset Fault
Command Fault
External Fault
Fault Channel
1
2
3
4
Fault Codes
CMP1
Low
Low
High
High
CMP3
Low
Low
High
High
CMP2
Low
High
Low
High
CMP4
Low
High
Low
High
Similarly, after the sequence-down phase has begun (ON
input low), the ON input must remain below 0.97V until
DONE pulls high (sequence-down complete). Pulling ON
high before the sequence-down process is complete is
considered a command fault. All enable outputs and FLT
are pulled low.
Should multiple faults occur simultaneously, the reported
fault is given priority according to the following order:
1) Sequence Fault
2) External Fault
3) Reset Fault
4) Command Fault (channel code is meaningless)
2928f
15
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