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参数资料
| 型号： | LTC2928CUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/32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： | 0°C ~ 70°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
PIN FUNCTIONS
CAS: Cascade Input/Output. Connect the cascade pin
between a master and one or more slave devices to in-
crease the number of supplies that can be sequenced per
time position. See Applications Information for details.
Do not add capacitance to the cascade pin. Leave open
if unused.
CMP1-CMP4: Comparator and/or Fault Status Outputs.
The CMP outputs have a weak internal pull-up to V CC and
may be pulled above V CC using an external pull-up. During
sequence-up or sequence-down operation, all compara-
tor outputs are low. After sequencing-up, during supply
monitoring, comparator outputs pull low if their monitor
input drops below its undervoltage threshold. In the event
of a system fault, the CMP outputs latch and may be read
to diagnose the type and source of fault. See Applications
Information for the fault reporting details. Leave the CMP
outputs open if unused.
DONE : Sequence Done Output. The last (or only) LTC2928
must have DONE pulled high with an external resistor to
V CC (3.3k 5% recommended). The LTC2928 floats DONE
until the completion of a sequence-up operation when it
is pulled down. At the end of a sequence-down operation,
the LTC2928 returns DONE to a high-impedance state. If
subsequent time positions are required for additional sup-
plies, use the DONE —ON handshake connection. See Ap-
plications Information regarding the DONE —ON protocol.
EN1-EN4: Enable Outputs. Connect these outputs to a power
supply shutdown input or an external N-channel MOSFET
gate for the supply to be sequenced. When enabled, each
output is connected to an internal charge pumped sup-
ply (nominally V CC + 5.5V) via an internal 10 μ A current
source. When disabled, each output is pulled to ground.
EN outputs operate with their respective RT inputs. Leave
enable outputs open when unused.
Exposed Pad: Exposed pad may be left floating or con-
nected to device ground.
FLT : Fault Input/Output. Pull FLT high with an external
resistor (10k recommended). The LTC2928 will pull FLT
low if an internal fault condition is detected (see Applica-
tions Information for details). An external signal such as
OV may also pull down the FLT pin to cause an external
fault. Any internal or external fault condition forces all
enable outputs low. In order to clear a fault condition, a
“return-to-zero” state must be reached with all monitored
supplies falling below their configured sequence-down
thresholds, while the ON input is below 0.97V. Debugging
modes are available (use the MS1, MS2 inputs) to leave
supplies enabled upon system faults. See Applications
Information for configuration tables.
GND: Device ground.
HV CC : High Voltage (7.2V to 16.5V) Power Supply Input.
Bypass HV CC with at least 0.1 μ F to ground in close prox-
imity to this pin. The internal HV CC regulator provides a
regulated 3.3V to V CC . V CC may be used to power exter-
nal circuits (limited to 10 mA external load). Tie HV CC to
ground when unused.
MS1, MS2: Master/Slave Three State Configuration In-
puts. Depending on the application, select each LTC2928
as a master or slave part and whether or not the part is
designated as the first part in a cascade application. The
RST — FLT relationship (after RST pulls high for the first
time) is also configured with these inputs. Select whether
or not RST pulling low should cause FLT to pull low and
shutdown the system. Select debugging modes to leave
supplies enabled upon system faults. See Applications
Information for configuration table.
N/C: No Connect. Unconnected pins.
ON: Sequence Up/Down Input. A voltage transition above
1V starts the sequence-up phase. A voltage transition below
0.97V starts the sequence-down phase. An ON transition
applied during a sequence-up (or down) phase is treated
as a command fault. See Applications Information for us-
ing the DONE —ON handshake protocol when cascading
multiple LTC2928s to append additional time positions.
OV : Overvoltage Output. Pulls low when any positive supply
exceeds its configured overvoltage threshold. OV remains
low until all positive supplies have remained below the
overvoltage threshold for a time equal to the configured
FLT delay time. To generate an overvoltage fault, connect
OV to FLT . The OV output has a weak pull-up to V CC and
may be pulled above V CC using an external pull-up. OV
may be left unconnected if unused. See Applications
Information for details.
2928f
9
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