lt1175cst-5-pbf Linear Technology Corporation, lt1175cst-5-pbf Datasheet

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lt1175cst-5-pbf

Manufacturer Part Number
lt1175cst-5-pbf
Description
500ma Negative Low Dropout Micropower Regulator
Manufacturer
Linear Technology Corporation
Datasheet
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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lt1175cst-5-pbf Summary of contents

Page 1

... 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. All other trademarks are the property of their respective owners. U TYPICAL APPLICATION Typical LT1175 Connection + SHDN GND ...

Page 2

... V ≤ 12V IN OUT Pin Voltage .......................... 30V, – FRONT VIEW ORDER 3 GND PART NUMBER TAB INPUT IN LT1175CST-5 1 OUTPUT LT1175IST-5 ST PACKAGE 3-LEAD PLASTIC SOT-223 θ = 50°C/ W WITH BACKPLANE JA 2 AND 10cm TOPSIDE LAND SOLDERED TO TAB ORDER PART NUMBER FRONT VIEW ...

Page 3

ELECTRICAL CHARACTERISTICS range, otherwise specifications are 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 GND Pin ...

Page 4

LT1175 W U TYPICAL PERFORMANCE CHARACTERISTICS Typical Current Limit Characteristics 1.0 CURRENT LIMIT CHANGES ONLY SLIGHTLY WITH TEMPERATURE SO CURVES ARE REPRESENTATIVE OF ALL TEMPERATURES 0 TIED TO V LIM2 LIM IN 0.6 I TIED TO V ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS GND pin Current POWER TRANSISTOR 8 IN DROPOUT T = –55° 25° 0.2 0.3 0.4 0.1 OUTPUT CURRENT ( PIN ...

Page 6

LT1175 U U APPLICATIONS INFORMATION Note to Reader: To avoid confusion when working with negative voltages (is – 6V more or less than – 5V?), I have decided to treat the LT1175 were a positive regulator and ...

Page 7

U U APPLICATIONS INFORMATION normally a good thing when the regulator is used by itself, but it prevents the user from shutting down the regulator when a second power source is connected to the LT1175 output. If active output pull-down ...

Page 8

LT1175 U U APPLICATIONS INFORMATION LT1175 AC FEEDFORWARD PATH NEGATIVE DC FEEDBACK Q3 AT LIGHT LOADS R 0.3Ω. This condition can occur with ceramic or film capacitors which often have an ESR under 0.1Ω. With previous designs, the user was ...

Page 9

U U APPLICATIONS INFORMATION during a “shorting out” surge, only during a “charge up” surge. The output capacitor should be located within several inches of the regulator. If remote sensing is used, the output capacitor can be located at the ...

Page 10

LT1175 U U APPLICATIONS INFORMATION T = Maximum ambient temperature Maximum LT1175 die temperature (125°C for MAX commercial and industrial grades) = LT1175 thermal resistance, junction to ambient θ Maximum continuous input voltage at ...

Page 11

U U APPLICATIONS INFORMATION To estimate regulator output ripple under different condi- tions, the following general comments should be helpful: 1. Output ripple at high frequency is only weakly affected by load current or output capacitor size for medium to ...

Page 12

LT1175 PACKAGE DESCRIPTION .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL ...

Page 13

PACKAGE DESCRIPTIO .060 .256 (1.524) (6.502) .060 .183 (1.524) (4.648) .075 (1.905) .300 (7.620) BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK .067 RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT ...

Page 14

LT1175 PACKAGE DESCRIPTIO .050 BSC .245 MIN .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 – .020 (0.254 – 0.508) .008 – .010 (0.203 – 0.254) (0.406 – 1.270) NOTE: 1. DIMENSIONS IN (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. ...

Page 15

... MAX Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights Package 3-Lead Plastic SOT-223 (Reference LTC DWG # 05-08-1630) .248 – ...

Page 16

... TYP .095 – .115 (2.413 – 2.921) .155 – .195* (3.937 – 4.953) .013 – .023 (0.330 – 0.584) * MEASURED AT THE SEATING PLANE T5 (TO-220) 0801 LT/LT 0305 REV D • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1995 1175fd ...

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