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LTC1844ES5-1.8 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC1844ES5-1.8
Description  150mA, Micropower, Low Noise, VLDO Linear Regulator
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1844ES5-1.8 Datasheet(HTML) 10 Page - Linear Technology

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10
LTC1844 Series
1844ia
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 10
µA.
Alternatively, when VOUT is held constant and VIN varied,
current flow will follow Figure 8’s curves. IOUT will be less
than 10
µA at all times except for a brief spike just below
2.7V before the reverse current protection circuitry acti-
vates.
APPLICATIONS INFORMATION
Figure 7. Reverse Current vs Output Voltage
Figure 8. Reverse Current vs Input Voltage
OUTPUT VOLTAGE (V)
0
0
5
15
20
25
50
35
2
4
5
IIN
1844 F07
10
40
45
30
1
3
6
7
LTC1844-2.8
TJ = 25°C
VIN = 3.3V
CURRENT FLOWS
INTO PINS
IOUT
IN CURRENT
LIMIT BELOW
2.8V
INPUT VOLTAGE (V)
0
0.5
1.0
1.5
2.0
1844 F08
2.5
100
90
80
70
60
50
40
30
20
10
0
3.0
IOUT
IIN
LTC1844-2.8
TJ = 25°C
VOUT = 2.7V
CURRENT FLOW
INTO PINS
IN CURRENT
LIMIT ABOVE
2.7V


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