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參數(shù)資料
| 型號： | LTC1728HS5-5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | PLASTIC, SOT-23, 5 PIN |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 197K |
| 代理商： | LTC1728HS5-5 |
11
LTC1727/LTC1728
17278fb
Override Functions (5V Versions Only)
The VCCA pin, if unused, can be tied to either VCC3 or VCC5.
This is an obvious solution since the trip points for VCC3
and VCC5 will always be greater than the trip point for VCCA.
The VCC5 input trip point is disabled if its voltage is equal
to the voltage on VCC3 ±25mV and the voltage on VCC5 is
less than 4.15V. In this manner, the LTC1727-5/
LTC1728-5 will behave as a 3.3V monitor and VCC5 reset
capability will be disabled.
The VCC5 trip point is reenabled when the voltage on VCC5
is equal to the voltage on VCC3 ±25mV and the two inputs
are greater than approximately 4.15V. In this manner, the
part can function as a 5V monitor with the 3.3V monitor
disabled.
APPLICATIO S I FOR ATIO
WU
U
Figure 3. RST Voltage vs Supply Voltage
Figure 2. Single Supply Monitor with Others Disabled
When monitoring either 3.3V or 5V with VCC3 strapped to
VCC5 (see Figure 2), the part determines which is the
appropriate range. The part handles this situation as
shown in Figure 3. Above 1V and below VRT3, RST is held
low. From VRT3 to approximately 4.15V the part assumes
3.3V supply monitoring and RST is deasserted. Above
approximately 4.15V the part operates as a 5V monitor.
In most systems the 5V supply will pass through the 3.1V
to 4.15V region in < 200ms during power-up, and the
RST output will behave as desired. Table 1 summarizes
the state of RST at various operating voltages with
VCC3 = VCC5.
Table 1. Override Truth Table (VCC3 = VCC5)
INPUTS (VCC3 = VCC5 = VCC)
RST
0V
≤ VCC ≤ 1V
—
1V
≤ VCC ≤ VRT3
0
VRT3 ≤ VCC ≤ 4.15V
1
4.15V
≤ VCC ≤ VRT5
0
VRT5 ≤ VCC
1
VCC3
VCC5
VCCA
GND
1
5
4
3
2
RST
LTC1728-5
1727/28 F02
TO SYSTEM
RESET
R1
10k
VCC
3.3V OR 5V
SUPPLY VOLTAGE (V)
0
RST
OUTPUT
VOLTAGE
(V)
3
4
5
4
1727/28 F03
2
1
0
1
2
3
5
VCC3 = VCC5 = VCCA = 0V TO 5V
10k PULL-UP FROM RST TO VCC3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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