LT1175
500mA Negative
Low Dropout Micropower
Regulator
FeaTures
DescripTion
The LT®1175 is a negative micropower low dropout
regulator. It features 45µA quiescent current, dropping
to 10µA in shutdown. A new reference amplifier topology
gives precision DC characteristics along with the ability to
maintain good loop stability with an extremely wide range
of output capacitors. Very low dropout voltage and high
efficiency are obtained with a unique power transistor
anti-saturation design. Adjustable and fixed 5V versions
are available.
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Operating Current: 45µA
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Adjustable Current Limit
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Low Voltage Linear Dropout Characteristics
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Stable with Wide Range of Output Capacitors
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Shutdown Current: 10µA
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Positive or Negative Shutdown Logic
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Fixed 5V and Adjustable Versions
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Tolerates Reverse Output Voltage
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Available in 8-pin PDIP and SO Packages, 3-lead
SOT-223, 5-Pin Surface Mount DD and Through-Hole
TO-220 Packages
Several new features make the LT1175 very user-friendly.
The SHDN pin can interface directly to either positive or
negative logic levels. Current limit is user-selectable at
200mA, 400mA, 600mA and 800mA. The output can be
forced to reverse voltage without damage or latchup. Un-
likesomeearlierdesigns,theincreaseinquiescentcurrent
during a dropout condition is actively limited.
applicaTions
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Analog Systems
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Modems
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Instrumentation
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A/D and D/A Converters
The LT1175 has complete blowout protection with current
limiting, power limiting and thermal shutdown. Special
attention was given to the problem of high temperature
operation with micropower operating currents, preventing
output voltage rise under no-load conditions. The LT1175
is available in 8-pin PDIP and SO packages, 3-lead SOT-
223 as well as 5-pin surface mount DD and through-hole
TO-220 packages. The 8-pin SO package is specially
constructed for low thermal resistance.
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Interface Drivers
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Battery-Powered Systems
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion
Minimum Input-to-Output Voltage
1.0
T
= 25°C
Typical LT1175 Connection
J
I
, I
TIED TO V
LIM2 LIM4 IN
0.8
0.6
0.4
0.2
0
+
+
C
OUT
C
*
IN
≥ 0.1µF
SHDN
GND
SENSE
–5V
UP TO 500mA
V
–V
IN
IN
I
LT1175-5
OUTPUT
LIM2
I
LIM4
*C IS NEEDED ONLY IF REGULATOR IS MORE THAN 6" FROM
IN
INPUT SUPPLY CAPACITOR. SEE APPLICATIONS INFORMATION
0
0.2 0.3 0.4
0.5 0.6 0.7
0.1
1175 TA01
SECTION FOR DETAILS
OUTPUT CURRENT (A)
1175 TA02
1175fe
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