LT1175IS85 Linear Technology Corporation, LT1175IS85 Datasheet

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LT1175IS85

Manufacturer Part Number
LT1175IS85
Description
SOP8
Manufacturer
Linear Technology Corporation
Datasheet

Specifications of LT1175IS85

Date_code
05+
APPLICATIONS
FEATURES
TYPICAL
All other trademarks are the property of their respective owners.
Stable with Wide Range of Output Capacitors
Operating Current: 45
Shutdown Current: 10µA
Adjustable Current Limit
Positive or Negative Shutdown Logic
Low Voltage Linear Dropout Characteristics
Fixed 5V and Adjustable Versions
Tolerates Reverse Output Voltage
Analog Systems
Modems
Instrumentation
A/D and D/A Converters
Interface Drivers
Battery-Powered Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
–V
*C
IN
INPUT SUPPLY CAPACITOR. SEE APPLICATIONS INFORMATION
SECTION FOR DETAILS
C
IN
IN
*
IS NEEDED ONLY IF REGULATOR IS MORE THAN 6" FROM
+
APPLICATION
Typical LT1175 Connection
I
INPUT
I
LIM2
LIM4
U
SHDN
LT1175-5
µ
A
GND
SENSE
OUT
U
+
C
≥ 0.1µF
OUT
–5V
UP TO 500mA
1175 TA01
DESCRIPTION
The LT
lator. 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.
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.
Unlike some earlier designs, the increase in quiescent
current during a dropout condition is actively limited.
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.
Low Dropout Micropower
®
1175 is a negative micropower low dropout regu-
1.0
0.8
0.6
0.4
0.2
0
Minimum Input-to-Output Voltage
0
T
I
LIM2
J
= 25°C
0.1
, I
LIM4
U
500mA Negative
0.2
OUTPUT CURRENT (A)
TIED TO V
0.3
IN
0.4
0.5
Regulator
0.6
1175 TA02
0.7
LT1175
1175fd
1

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