LT1175 Ver la hoja de datos (PDF) - Linear Technology
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LT1175 Datasheet PDF : 18 Pages
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LT1175
Electrical Characteristics 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.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Feedback Sense Voltage
Adjustable Part
Fixed 5V Part
3.743 3.8 3.857
V
4.93 5.0 5.075
V
Output Voltage Initial Accuracy
Adjustable, Measured at 3.8V Sense
Fixed 5V
0.5 1.5
%
0.5 1.5
%
Output Voltage Accuracy (All Conditions)
Quiescent Input Supply Current
VIN – VOUT = 1V to VIN = 20V, IOUT = 0A to 500mA
l
P = 0 to PMAX, TJ = TMIN to TMAX (Note 3)
VIN – VOUT ≤ 12V
l
1.5 2.5
%
45
65
µA
80
µA
GND Pin Current Increase with Load (Note 4)
l
10
20 µA/mA
Input Supply Current in Shutdown
VSHDN = 0V
10
20
µA
l
25
µA
Shutdown Thresholds (Note 9)
Either Polarity On SHDN Pin
l 0.8
2.5
V
SHDN Pin Current (Note 2)
Output Bleed Current in Shutdown (Note 6)
VSHDN = 0V to 10V (Flows Into Pin)
VSHDN = –15V to 0V (Flows Into Pin)
VOUT = 0V, VIN = 15V
l
4
8
µA
1
4
µA
0.1
1
µA
l
1
5
µA
SENSE Pin Input Current
(Adjustable Part Only, Current Flows Out of Pin)
l
(Fixed Voltage Only, Current Flows Out of Pin)
l
75 150
nA
12
20
µA
Dropout Voltage (Note 7)
Current Limit (Note 11)
Line Regulation (Note 10)
Load Regulation (Note 5, 10)
Thermal Regulation
IOUT = 25mA
IOUT = 100mA
IOUT = 500mA
ILIM2 Open, IOUT = 300mA
ILIM4 Open, IOUT = 200mA
ILIM2, ILIM4 Open, IOUT = 100mA
VIN – VOUT = 1V to 12V
ILIM2 Open
ILIM4 Open
ILIM2, ILIM4 Open
VIN – VOUT = 1V to VIN = 20V
IOUT = 0mA to 500mA
P = 0 to PMAX (Notes 3, 8)
5-Pin Packages
8-Pin Packages
l
0.1 0.2
V
l
0.18 0.26
V
l
0.5 0.7
V
l
0.33 0.5
V
l
0.3 0.45
V
l
0.26 0.45
V
l 520 800 1300
mA
l 390 600 975
mA
l 260 400 650
mA
l 130 200 325
mA
l
0.003 0.015 %/V
l
0.1 0.35
%
0.04 0.1
%/W
0.1 0.2
%/W
Output Voltage Temperature Drift
TJ = 25°C to TJMIN, or 25°C to TJMAX
0.25 1.25
%
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
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).
1175fe
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