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參數(shù)資料
| 型號(hào)： | RT9641AC32 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | TRIPLE LINEAR REGULATOR CONTROLLER SUPPORT |
| 中文描述： | 三重線性穩(wěn)壓器控制器支持 |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大?。?/td> | 232K |
| 代理商： | RT9641AC32 |
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RT9641A/B
www.richtek-ic.com.tw
8
DS9641A/B-03 March 2002
Table 2. 5VDUAL Output (V
OUT3
) Truth Table
EN5VDL
S5 S3 5VDL
Comments
0
1
1
5V
S0, S1 States(Active)
0
1
0
0V
S3
0
0
1
Note
Maintains Previous State
0
0
0
0V
S4/S5
1
1
1
5V
S0, S1 States(Active)
1
1
0
5V
S3
1
0
1
Note
Maintains Previous State
1
0
0
5V
S4/S5
Note: Combination not allowed.
Very similarly, Table 2 details the fact that EN5VDL
status controls whether the 5VDUAL plane supports
sleeps states.
Table 3. 2.5V/3.3V(2.6V/3.43V) VMEM Output (V
OUT2
)
Truth Table
2.5V/3.3V
RSEL S5 S3
1K
Comments
1
1
2.5V/2.6V
S0, S1 States(Active)
1K
1
0
2.5V
S3
1K
0
1
Note
Maintains Previous State
1K
0
0
0V
S4/S5
10K
1
1
3.3V/3.43V
S0, S1 States(Active)
10K
1
0
3.3V
S3
10K
0
1
Note
Maintains Previous State
10K
0
0
0V
S4/S5
Note: Combination not allowed.
As seen in Table 3, 2.5V/3.3V(2.6V/3.43V) VMEM
output is maintained in S3 (Suspend-To-RAM), but not
in
S4/S5
state.
The
accommodates both SDRAM as well as RDRAM type
memories.
dual-voltage
support
Fault Protection
All the outputs are monitored against under-voltage
events. A serve over-current caused by a failed load
on any of the outputs, would, in turn, cause that
specific output to suddenly drop. If any of the output
voltages drop below 68% of their set value, such event
is reported by having the FAULT/MSEL pin pulled to
5V. Additionally, the 2.5V/3.3V(2.6V/3.43V) memory
regulator is internally current limited while in a sleep
state. Exceeding the maximum current rating of this
output in a sleep state can lead to output voltage
drooping. If excessive, this droop can ultimately trip the
under-voltage detector and send a FAULT signal to the
computer system. However, a FAULT condition will
only set off the FAULT flag, and it will not shut off or
latch off any part of the circuit. If shutdown or latch off
the circuit is desired, this can be achieved by externally
pulling or latching the SS pin low. Pulling the SS pin
low will also force the FAULT pin to go low.
Under-voltage sensing is disabled on all disabled
outputs and during soft-start ramp-up intervals.
Another condition that could set off the FAULT flag is
chip over-temperature. If the RT9641A/B reaches an
internal temperature of 145
°
C (typical), the FAULT flag
is set (FAULT/MSEL pulled high), but the chip
continues to operate until the temperature reaches
155
°
C (typical), when unconditional shutdown of all
outputs takes place. The thermal shutdown can be
released with a re-soft-start when the chip cools down.
Shutdown
In case of a FAULT condition that might endanger the
computer system, or at any other time, the RT9641A/B
can be shut down by pulling the SS pin below the
specified shutdown level (typically 0.8V) with an open
drain or open collector device capable of sinking a
minimum of 2mA. Pulling the SS pin low effectively
shuts down all the pass elements. Upon release of the
SS pin, the RT9641A/B undergoes a new soft-start
cycle and resumes normal operation in accordance to
the ATX supply and control pins status.
Layout Considerations
The typical application employing a RT9641A/B is a
fairly straight-forward implementation. Similar to any
other linear regulators, attention has to be paid to a
few potentially sensitive small signal components, such
as those connected to high-impedance nodes or those
supplying critical by-pass currents.
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