lt1129cst-5-pbf Linear Technology Corporation, lt1129cst-5-pbf Datasheet

lt1129cst-5-pbf

Manufacturer Part Number

lt1129cst-5-pbf

Description

700ma Micropower Low Dropout Regulator With Shutdown

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1129CST-5-PBF.pdf (16 pages)

Current page: 1 of 16
Download datasheet (164Kb)

APPLICATIO S

■

FEATURES

TYPICAL APPLICATIO

0.4V 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 Packages

Low Current Regulator

Regulator for Battery-Powered Systems

Post Regulator for Switching Supplies

5V to 3.3V Logic Regulator

> 5.5V

5V Supply with Shutdown

SHDN

< 0.25

> 2.8

(PIN 4)

LT1129-5

GND

SENSE

OUTPUT

OUT

OFF

3.3μF

SOLID TANTALUM

5V OUT

500mA

LT1129 • TA01

DESCRIPTIO

The LT

dropout regulators with shutdown. The devices are ca-

pable of supplying 700mA of output current with a dropout

voltage of 0.4V 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 in-

clude 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 stabil-

ity. Also the input may be connected to ground or a reverse

voltage without reverse current flow 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 flow from the output pin to ground. The

devices are available in 5-lead TO-220, 5-lead DD and

3-lead SOT-223 packages.

All other trademarks are the property of their respective owners.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

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

0.4

0.3

0.2

0.1

0.2

OUTPUT CURRENT (A)

Dropout Voltage

0.3

0.4

0.5

0.6

LT1129 • TA02

0.7

112935fd

Related parts for lt1129cst-5-pbf

lt1129cst-5-pbf Summary of contents

Page 1

... Under these conditions, only 16μA will flow from the output pin to ground. The devices are available in 5-lead TO-220, 5-lead DD and 3-lead SOT-223 packages. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 5V OUT 500mA + 3.3μ ...

Page 2

... W JA OBSOLETE PACKAGE ORDER PART FRONT VIEW 3 OUTPUT TAB LT1129CST-3 GND LT1129CST-5 GND LT1129IST-3 LT1129IST PACKAGE 3-LEAD PLASTIC SOT-223 θ ≈ 50° Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T PARAMETER CONDITIONS Regulated Output Voltage LT1129-3.3 (Notes 4, 12) LT1129-5 LT1129 (Note 5) Line Regulation (Note 12) LT1129-3.3 LT1129-5 LT1129 (Note 5) Load Regulation (Note 12) LT1129-3.3 LT1129-5 LT1129 (Note 5) ...

Page 4

LT1129/LT1129-3.3/LT1129-5 ELECTRICAL CHARACTERISTICS 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: The shutdown ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Guaranteed Dropout Voltage 0.7 0.6 ≤ 125° 0.5 ≤ 25° 0.4 0.3 0.2 0.1 = TEST POINTS 0 0.4 0.7 0 0.1 0.2 0.3 0.5 0.6 OUTPUT CURRENT (A) ...

Page 6

LT1129/LT1129-3.3/LT1129 TYPICAL PERFOR A CE CHARACTERISTICS LT1129-3.3 Ground Pin Current 2 25° OUT R = 33Ω V LOAD 1.6 SENSE I = 100mA* LOAD 1.4 1 66Ω LOAD 1.0 I ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS Shutdown Pin Current SHDN – 100 125 –25 TEMPERATURE (°C) 1129 G25 Reverse Output Current ...

Page 8

LT1129/LT1129-3.3/LT1129 TYPICAL PERFOR A CE CHARACTERISTICS Load Regulation 0 LT1129-3.3 –5 –10 LT1129* LT1129-5 –15 – (NOMINAL OUT –25 ΔI = 1mA to 700mA LOAD * ADJ OUT –30 –50 ...

Page 9

CTIO S Adjust Pin: For the LT1129 (adjustable version) the adjust pin is the input to the error amplifier. This pin is internally clamped to 6V and – 0.6V (one V BE current of 150nA ...

Page 10

LT1129/LT1129-3.3/LT1129 APPLICATIO S I FOR ATIO Thermal Considerations The power handling capability of the device will be limited by the maximum rated junction temperature (125°C). The power dissipated by the device will be made up of two components: ...

Page 11

U U APPLICATIO S I FOR ATIO Calculating Junction Temperature Example: Given an output voltage of 3.3V, an input voltage range of 4.5V to 5.5V, an output current range of 0mA to 500mA, and a maximum ambient temperature of 50°C, ...

Page 12

LT1129/LT1129-3.3/LT1129 APPLICATIO S I FOR ATIO In some applications it may be necessary to leave the input to the LT1129 unconnected when the output is held high. This can happen when the LT1129 is powered from a rectified ...

Page 13

PACKAGE DESCRIPTIO 6.60 ±0.10 0.45 ±0.05 RECOMMENDED SOLDER PAD LAYOUT 4.30 – 4.50** (.169 – .177) 0.09 – 0.20 (.0035 – .0079) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS 2. DIMENSIONS ARE IN 3. DRAWING NOT TO SCALE * DIMENSIONS DO NOT ...

Page 14

LT1129/LT1129-3.3/LT1129-5 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 ...

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. LT1129/LT1129-3.3/LT1129 Package 8-Lead Plastic Small Outline (Narrow 0 ...

Page 16

... MEASURED AT THE SEATING PLANE T5 (TO-220) 0801 Noise RMS Noise RMS Noise RMS Noise RMS Noise RMS Noise RMS LT/CGRAFX 0507 REV D • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1994 112935fd ...

Related keywords

lt1129cst-5-pbf datasheet
lt1129cst-5-pbf data sheet
lt1129cst-5-pbf pdf datasheet
lt1129cst-5-pbf component
lt1129cst-5-pbf part
lt1129cst-5-pbf distributor
lt1129cst-5-pbf RoHS
lt1129cst-5-pbf datasheet download