LTC1844ES5-2.8 Просмотр технического описания (PDF) - Linear Technology
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LTC1844ES5-2.8 Datasheet PDF : 12 Pages
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LTC1844 Series
APPLICATIONS INFORMATION
When VIN is held constant and VOUT varied, current flow
will follow the curves shown in Figure 7. With VOUT held
below VOUT(NOM), the LTC1844 will be in current limit
trying to pull VOUT up. With VOUT held between VOUT(NOM)
and VIN, IIN will be at the normal quiescent current level
and IOUT will be 1µA to 2µA. As VOUT is pulled above VIN,
IOUT temporarily increases to 30µA until the reverse cur-
rent protection circuitry activates and reduces IOUT to less
than 10µA.
50
LTC1844-2.8
45
TJ = 25°C
40
VIN = 3.3V
CURRENT FLOWS
35
INTO PINS
30
IN CURRENT
25 LIMIT BELOW
2.8V
20
15
IOUT
IIN
10
5
0
01
2 34
5 67
OUTPUT VOLTAGE (V)
1844 F07
Figure 7. Reverse Current vs Output Voltage
Alternatively, when VOUT is held constant and VIN varied,
current flow will follow Figure 8’s curves. IOUT will be less
than 10µA at all times except for a brief spike just below
2.7V before the reverse current protection circuitry acti-
vates.
100
LTC1844-2.8
90 TJ = 25°C
80
VOUT = 2.7V
CURRENT FLOW
70 INTO PINS
IN CURRENT
LIMIT ABOVE
2.7V
60
50
40
30
IIN
20
10
0
0
IOUT
0.5 1.0 1.5 2.0 2.5 3.0
INPUT VOLTAGE (V)
1844 F08
Figure 8. Reverse Current vs Input Voltage
1844ia
10
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