LT1121ACS8(RevA) Просмотр технического описания (PDF) - Linear Technology
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LT1121ACS8 Datasheet PDF : 12 Pages
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APPLICATI S I FOR ATIO
When the input of the LT1121 is forced to a voltage below
its nominal output voltage and its output is held high, the
reverse output current will still follow the curve in Figure
2. This condition can occur if the input of the LT1121 is
connected to a discharged (low voltage) battery and the
output is held up by either a backup battery or by a second
regulator circuit. When the input pin is forced below the
output pin or the output pin is pulled above the input pin,
the input current will typically drop to less than 2µA (see
Figure 3). The state of the shutdown pin will have no effect
on the reverse output current when the output is pulled
above the input.
LT1121/LT1121-3.3/LT1121-5
5
VOUT = 3.3V (LT1121-3.3)
VOUT = 5V (LT1121-5)
4
3
2
1
0
0
1
2
3
4
5
INPUT VOLTAGE (V)
1121 F03
Figure 3. Input Current
Table 6. Fault Conditions
INPUT PIN
SHDN PIN
< VOUT (Nominal)
Open (Hi)
< VOUT (Nominal)
Grounded
Open
Open
≤ 0.8V
≤ 0.8V
> 1.5V
– 30V < VIN < 30V
Open (Hi)
Grounded
Open (Hi)
Grounded
Open (Hi)
Grounded
OUTPUT PIN
Forced to VOUT (Nominal)
Forced to VOUT (Nominal)
Forced to VOUT (Nominal)
Forced to VOUT (Nominal)
≤ 0V
≤ 0V
≤ 0V
≤ 0V
Reverse Output Current ≈ 15µA (See Figure 2)
Input Current ≈ 1µA (See Figure 3)
Reverse Output Current ≈ 15µA (See Figure 2)
Input Current ≈ 1µA (See Figure 3)
Reverse Output Current ≈ 15µA (See Figure 2)
Reverse Output Current ≈ 15µA (See Figure 2)
Output Current = 0
Output Current = 0
Output Current = Short-Circuit Current
Output Current = 0
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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