LT1129CS8 Linear Technology, LT1129CS8 Datasheet

IC LDO REG ADJ W/SHTDWN 8-SOIC

LT1129CS8

Manufacturer Part Number
LT1129CS8
Description
IC LDO REG ADJ W/SHTDWN 8-SOIC
Manufacturer
Linear Technology
Datasheet

Specifications of LT1129CS8

Regulator Topology
Positive Adjustable
Voltage - Output
3.8 ~ 30 V
Voltage - Input
4.15 ~ 30 V
Voltage - Dropout (typical)
0.45V @ 700mA
Number Of Regulators
1
Current - Output
700mA
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Limit (min)
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1129CS8
Manufacturer:
LT
Quantity:
10 000
Part Number:
LT1129CS8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1129CS8#TR
Manufacturer:
TAI-TECH
Quantity:
1 928
Part Number:
LT1129CS8#TRPBF
Manufacturer:
LINEAR
Quantity:
19 921
Part Number:
LT1129CS8#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1129CS8-3.3
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1129CS8-3.3#TR
Manufacturer:
LT
Quantity:
58
Part Number:
LT1129CS8-3.3#TRPBF
Manufacturer:
LINEAR
Quantity:
13 022
Part Number:
LT1129CS8-5
Manufacturer:
LT
Quantity:
20 000
Part Number:
LT1129CS8-5.0
Manufacturer:
LINEAR/凌特
Quantity:
20 000
APPLICATIONS
TYPICAL APPLICATION
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
400mV Dropout Voltage
700mA Output Current
50μA Quiescent Current
No Protection Diodes Needed
Adjustable Output from 3.8V to 30V
3.3V and 5V Fixed Output Voltages
Controlled Quiescent Current in Dropout
Shutdown
16μA Quiescent Current in Shutdown
Stable with 3.3μF Output Capacitor
Reverse Battery Protection
No Reverse Output Current
Thermal Limiting
Surface Mount SOT-223 and DD-Pak Packages
Low Current Regulator
Regulator for Battery-Powered Systems
Post Regulator for Switching Supplies
5V to 3.3V Logic Regulator
V
IN
> 5.5V
5V Supply with Shutdown
5
V
4
SHDN
IN
SHDN
< 0.25
> 2.8
NC
(PIN 4)
LT1129-5
GND
3
SENSE
OUTPUT
OUT
OFF
ON
ON
2
1
+
3.3μF
SOLID TANTALUM
5V OUT
500mA
112935 TA01
DESCRIPTION
The LT
dropout regulators with shutdown. The devices are capable
of supplying 700mA of output current with a dropout
voltage of 400mV at maximum output. Designed for use
in battery-powered systems, the low quiescent current,
50μA operating and 16μA in shutdown, make them an ideal
choice. The quiescent current does not rise in dropout as
it does with many other low dropout PNP regulators.
Other features of the LT1129 /LT1129-3.3/LT1129-5 include
the ability to operate with small output capacitors. They
are stable with only 3.3μF on the output while most older
devices require between 10μF and 100μF for stability. Also
the input may be connected to ground or a reverse voltage
without reverse current fl ow from output to input. This
makes the LT1129/LT1129-3.3/LT1129-5 ideal for backup
power situations where the output is held high and the
input is at ground or reversed. Under these conditions,
only 16μA will fl ow from the output pin to ground. The
devices are available in 5-lead TO-220, 5-lead DD-Pak and
3-lead SOT-223 packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT1129/LT1129-3.3/LT1129-5
Regulators with Shutdown
Micropower Low Dropout
®
1129/LT1129-3.3/LT1129-5 are micropower low
0.6
0.5
0.2
0.4
0.3
0.1
0
0
0.1
Dropout Voltage
0.2
OUTPUT CURRENT (A)
0.3
0.4
0.5
0.6
112935 TA02
0.7
112935ff
1

Related parts for LT1129CS8

LT1129CS8 Summary of contents

Page 1

... The devices are available in 5-lead TO-220, 5-lead DD-Pak and 3-lead SOT-223 packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 5V OUT ...

Page 2

... TAPE AND REEL LT1129CS8#PBF LT1129CS8#TRPBF LT1129IS8#PBF LT1129IS8#TRPBF LT1129CS8-3.3#PBF LT1129CS8-3.3#TRPBF LT1129IS8-3.3#PBF LT1129IS8-3.3#TRPBF LT1129CS8-5#PBF LT1129CS8-5#TRPBF 2 (Note 1) Storage Temperature Range .................. – 65°C to 150°C Operating Junction Temperature Range (Note 3) LT1129C-X .......................................... 0°C to 125°C LT1129C-X Extended Temperature Range (Note 12) ....................................... –40°C to 125°C LT1129I-X(Note 12) ......................... –40°C to 125°C LT1129MP-X(Note 12) ..................... – ...

Page 3

... LT1129CT-3.3#PBF LT1129CT-3.3#TRPBF LT1129IT-3.3#PBF LT1129IT-3.3#TRPBF LT1129CT-5#PBF LT1129CT-5#TRPBF LT1129IT-5#PBF LT1129IT-5#TRPBF LEAD BASED FINISH TAPE AND REEL LT1129CS8 LT1129CS8#TR LT1129IS8 LT1129IS8#TR LT1129CS8-3.3 LT1129CS8-3.3#TR LT1129IS8-3.3 LT1129IS8-3.3#TR LT1129CS8-5 LT1129CS8-5#TR LT1129IS8-5 LT1129IS8-5#TR LT1129CST-3.3 LT1129CST-3.3#TR LT1129IST-3.3 LT1129IST-3.3#TR LT1129MPST-3.3 LT1129MPST-3.3#TR LT1129CST-5 LT1129CST-5#TR LT1129IST-5 LT1129IST-5#TR LT1129CQ LT1129CQ#TR LT1129IQ LT1129IQ#TR LT1129CQ-3.3 LT1129CQ-3 ...

Page 4

LT1129/LT1129-3.3/LT1129-5 ORDER INFORMATION LEAD BASED FINISH TAPE AND REEL LT1129CT-5 LT1129CT-5#TR LT1129IT-5 LT1129IT-5#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. For more ...

Page 5

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL CONDITIONS Ripple Rejection V – RIPPLE Current Limit V – Input Reverse Leakage Current V = –20V Reverse Output Current (Note 11) ...

Page 6

LT1129/LT1129-3.3/LT1129-5 TYPICAL PERFORMANCE CHARACTERISTICS LT1129-3.3 Quiescent Current 250 LOAD 225 ∞ LOAD 200 175 150 V = OPEN (HI) SHDN 125 100 SHDN ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS LT1129-3.3 Ground Pin Current 25° OUT SENSE 4.7Ω LOAD I = 700mA* LOAD 6.6Ω LOAD I = 500mA* LOAD 11Ω ...

Page 8

LT1129/LT1129-3.3/LT1129-5 TYPICAL PERFORMANCE CHARACTERISTICS Reverse Output Current (LT1129-5) OUT SENSE 3.3V (LT1129-3.3) OUT SENSE 3.75V (LT1129) OUT ADJ ...

Page 9

PIN FUNCTIONS Input Pin: Power is supplied to the device through the input pin. The input pin should be bypassed to ground if the device is more than 6 inches away from the main input fi lter capacitor. In general, ...

Page 10

LT1129/LT1129-3.3/LT1129-5 APPLICATIONS INFORMATION Adjustable Operation The adjustable version of the LT1129 has an output voltage range of 3.75V to 30V. The output voltage is set by the ratio of two external resistors as shown in Figure 2. The device servos ...

Page 11

OPERATION copper. This data can be used as a rough guideline in estimating thermal resistance. The thermal resistance for each application will be affected by thermal interactions with other components as well as board size and shape. Some experimentation will ...

Page 12

LT1129/LT1129-3.3/LT1129-5 APPLICATIONS INFORMATION Current limit protection and thermal overload protection are intended to protect the device against current overload conditions at the output of the device. For normal operation, the junction temperature should not exceed 125°C. The input of the ...

Page 13

... SHALL NOT EXCEED .152mm (.006") PER SIDE 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 14

... DRAWING NOT TO SCALE 14 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. Q Package 5-Lead Plastic DD Pak (LTC DWG # 05-08-1461) ...

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LT1129/LT1129-3.3/LT1129-5 S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) .189 – ...

Page 16

... MEASURED AT THE SEATING PLANE T5 (TO-220) 0801 Noise RMS Noise RMS Noise RMS Noise RMS Noise RMS Noise RMS LT 1208 REV F • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1994 112935ff ...

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