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LT1175CQ-5 Datasheet(PDF) 4 Page - Linear Technology

Part # LT1175CQ-5
Description  500mA Negative Low Dropout Micropower Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1175CQ-5 Datasheet(HTML) 4 Page - Linear Technology

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LT1175

1175fe
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: SHDN pin maximum positive voltage is 30V with respect to
–VIN and 13.5V with respect to GND. Maximum negative voltage is –20V
with respect to GND and –5V with respect to –VIN.
Note 3: PMAX = 1.5W for 8-pin packages, and 6W for 5-pin packages.
This power level holds only for input-to-output voltages up to 12V, beyond
which internal power limiting may reduce power. See Guaranteed Current
Limit curve in Typical Performance Characteristics section. Note that all
conditions must be met.
Note 4: GND pin current increases because of power transistor base
drive. At low input-to-output voltages (<1V) where the power transistor
The l denotes specifications which apply over the operating temperature
range, otherwise specifications are at TA = 25°C. VOUT = 5V, VIN = 7V, IOUT = 0, VSHDN = 3V, ILIM2 and ILIM4 tied to VIN, TJ = 25°C, unless
otherwise noted. To avoid confusion with “min” and “max” as applied to negative voltages, all voltages are shown as absolute values
except where polarity is not obvious.
is in saturation, GND pin current will be slightly higher. See Typical
Performance Characteristics.
Note 5: With ILOAD = 0, at TJ > 125°C, power transistor leakage could
increase higher than the 10µA to 25µA drawn by the output divider or fixed
voltage SENSE pin, causing the output to rise above the regulated value.
To prevent this condition, an internal active pull-up will automatically turn
on, but supply current will increase.
Note 6: This is the current required to pull the output voltage to within 1V
of ground during shutdown.
Note 7: Dropout voltage is measured by setting the input voltage equal to
the normal regulated output voltage and measuring the difference between
VIN and VOUT. For currents between 100mA and 500mA, with both ILIM
pins tied to VIN, maximum dropout can be calculated from
VDO = 0.15 + 1.1Ω (IOUT).
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Feedback Sense Voltage
Adjustable Part
Fixed 5V Part
3.743
4.93
3.8
5.0
3.857
5.075
V
V
Output Voltage Initial Accuracy
Adjustable, Measured at 3.8V Sense
Fixed 5V
0.5
0.5
1.5
1.5
%
%
Output Voltage Accuracy (All Conditions)
VIN – VOUT = 1V to VIN = 20V, IOUT = 0A to 500mA
P = 0 to PMAX, TJ = TMIN to TMAX (Note 3)
l
1.5
2.5
%
Quiescent Input Supply Current
VIN – VOUT ≤ 12V
l
45
65
80
µA
µA
GND Pin Current Increase with Load (Note 4)
l
10
20
µA/mA
Input Supply Current in Shutdown
VSHDN = 0V
l
10
20
25
µA
µA
Shutdown Thresholds (Note 9)
Either Polarity On SHDN Pin
l
0.8
2.5
V
SHDN Pin Current (Note 2)
VSHDN = 0V to 10V (Flows Into Pin)
VSHDN = –15V to 0V (Flows Into Pin)
l
4
1
8
4
µA
µA
Output Bleed Current in Shutdown (Note 6)
VOUT = 0V, VIN = 15V
l
0.1
1
1
5
µA
µA
SENSE Pin Input Current
(Adjustable Part Only, Current Flows Out of Pin)
(Fixed Voltage Only, Current Flows Out of Pin)
l
l
75
12
150
20
nA
µA
Dropout Voltage (Note 7)
IOUT = 25mA
IOUT = 100mA
IOUT = 500mA
ILIM2 Open, IOUT = 300mA
ILIM4 Open, IOUT = 200mA
ILIM2, ILIM4 Open, IOUT = 100mA
l
l
l
l
l
l
0.1
0.18
0.5
0.33
0.3
0.26
0.2
0.26
0.7
0.5
0.45
0.45
V
V
V
V
V
V
Current Limit (Note 11)
VIN – VOUT = 1V to 12V
ILIM2 Open
ILIM4 Open
ILIM2, ILIM4 Open
l
l
l
l
520
390
260
130
800
600
400
200
1300
975
650
325
mA
mA
mA
mA
Line Regulation (Note 10)
VIN – VOUT = 1V to VIN = 20V
l
0.003
0.015
%/V
Load Regulation (Note 5, 10)
IOUT = 0mA to 500mA
l
0.1
0.35
%
Thermal Regulation
P = 0 to PMAX (Notes 3, 8)
5-Pin Packages
8-Pin Packages
0.04
0.1
0.1
0.2
%/W
%/W
Output Voltage Temperature Drift
TJ = 25°C to TJMIN, or 25°C to TJMAX
0.25
1.25
%


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