Datasheet

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LT1129/LT1129-3.3/LT1129-5

112935fd

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

All other trademarks are the property of their respective owners.

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (V)

0.4

0.5

0.6

0.3 0.5

0.3

0.2

0.1 0.2

0.4 0.6 0.7

0.1

LT1129 • TA02

Dropout Voltage5V Supply with Shutdown

The LT

1129/LT1129-3.3/LT1129-5 are micropower low

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.

■

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

IN OUT

LT1129-5

GND

5V OUT

500mA

> 5.5V

3.3μF

SOLID TANTALUM

SENSE

LT1129 • TA01

SHDN

(PIN 4)

< 0.25

> 2.8

OUTPUT

OFF

SHDN

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

Micropower Low Dropout

Regulators with Shutdown

Summary of content (16 pages)

PAGE 1
LT1129/LT1129-3.3/LT1129-5 Micropower Low Dropout Regulators with Shutdown U FEATURES DESCRIPTIO ■ The LT®1129/LT1129-3.3/LT1129-5 are micropower low dropout regulators with shutdown. The devices are capable 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.
PAGE 2
LT1129/LT1129-3.3/LT1129-5 U W W W ABSOLUTE AXI U RATI GS (Note 1) Input Voltage ...................................................... ±30V* Output Pin Reverse Current ................................. 10mA Sense Pin Current ................................................ 10mA Adjust Pin Current ............................................... 10mA Sense Pin, Adjust Pin Reverse Voltage ................ – 0.6V Shutdown Pin Input Voltage (Note 2) ........ 6.5V, – 0.
PAGE 3
LT1129/LT1129-3.3/LT1129-5 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS Regulated Output Voltage (Notes 4, 12) LT1129-3.3 LT1129-5 LT1129 (Note 5) Line Regulation (Note 12) (Note 7) UNITS VIN = 3.8V, IOUT = 1mA, TJ = 25°C 4.3V < VIN < 20V, 1mA < IOUT < 700mA ● 3.250 3.200 3.300 3.300 3.350 3.400 V V VIN = 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 pin input voltage rating is required for a low impedance source. Internal protection devices connected to the shutdown pin will turn on and clamp the pin to approximately 7V or – 0.6V.
PAGE 5
LT1129/LT1129-3.3/LT1129-5 U W TYPICAL PERFOR A CE CHARACTERISTICS 0.6 TJ ≤ 125°C 0.5 TJ ≤ 25°C 0.3 0.2 0.1 70 A. ILOAD = 700mA B. ILOAD = 500mA C. ILOAD = 300mA D. ILOAD = 100mA E. ILOAD = 10mA 0.5 60 A QUIESCENT CURRENT (μA) 0.6 0.4 Quiescent Current Dropout Voltage 0.7 DROPOUT VOLTAGE (V) DROPOUT VOLTAGE (V) Guaranteed Dropout Voltage 0.7 B C 0.4 D 0.3 E 0.2 0.1 VSHDN = OPEN (HI) 50 40 30 VSHDN = 0V 20 10 = TEST POINTS 0 0 0.3 0.4 0.2 0.5 OUTPUT CURRENT (A) 0.1 0.
PAGE 6
LT1129/LT1129-3.3/LT1129-5 U W TYPICAL PERFOR A CE CHARACTERISTICS LT1129-3.3 Ground Pin Current LT1129-5 Ground Pin Current 2.0 2.0 1.8 RLOAD = 33Ω ILOAD = 100mA* GROUND PIN CURRENT (mA) 1.6 1.4 1.2 RLOAD = 66Ω ILOAD = 50mA* 1.0 0.8 0.6 RLOAD = 330Ω ILOAD = 10mA* 0.4 0.2 0 1 2 1.6 1.2 RLOAD = 100Ω ILOAD = 50mA* 1.0 0.8 0.6 RLOAD = 500Ω ILOAD = 10mA* 0.
PAGE 7
LT1129/LT1129-3.3/LT1129-5 U W TYPICAL PERFOR A CE CHARACTERISTICS Shutdown Pin Input Current Shutdown Pin Current 10 8 7 6 5 4 3 2 1 0 –50 50 25 0 75 TEMPERATURE (°C) –25 100 ADJUST PIN BIAS CURRENT (nA) SHUTDOWN PIN CURRENT (μA) SHUTDOWN PIN INPUT CURRENT (mA) VSHDN = 0V 9 Adjust Pin Bias Current 400 25 20 15 10 5 0 1 7 3 8 2 5 6 4 SHUTDOWN PIN VOLTAGE (V) 1129 G25 VIN = 0V VOUT = VSENSE = 5V (LT1129-5) VOUT = VSENSE = 3.3V (LT1129-3.3) VOUT = VADJ = 3.75V (LT1129) 10 1.0 0.8 0.
PAGE 8
LT1129/LT1129-3.3/LT1129-5 U W TYPICAL PERFOR A CE CHARACTERISTICS LT1129-5 Transient Response Load Regulation LT1129-5 Transient Response 0 LT1129-5 –15 0.05 0 –0.05 –0.10 0.2 0.1 VIN = 6V CIN = 3.3μF COUT = 47μF 0 –0.1 –0.2 0.7 –25 –30 –50 VIN = VOUT(NOMINAL) + 1V ΔILOAD = 1mA to 700mA *VADJ = VOUT 50 25 0 75 TEMPERATURE (°C) –25 100 125 0.6 0.
PAGE 9
LT1129/LT1129-3.3/LT1129-5 U U U PI FU 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 VBE). This pin has a bias current of 150nA which flows into the pin. See Bias Current curve in the Typical Performance Characteristics. The adjust pin reference voltage is equal to 3.75V referenced to ground. RP IN OUT LT1129 1μF SHDN SENSE LOAD + 10μF GND RP LT1129 • F01 Figure 1.
PAGE 10
LT1129/LT1129-3.3/LT1129-5 U W U U 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: 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.
PAGE 11
LT1129/LT1129-3.3/LT1129-5 U W U U APPLICATIO S I FOR ATIO Calculating Junction Temperature Protection Features 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, what will the maximum junction temperature be? The LT1129 incorporates several protection features which make it ideal for use in battery-powered circuits.
PAGE 12
LT1129/LT1129-3.3/LT1129-5 U U W U 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 AC source. If the AC source is removed, then the input of the LT1129 is effectively left floating. The reverse output current also follows the curve in Figure 3 if the input pin is left open.
PAGE 13
LT1129/LT1129-3.3/LT1129-5 U PACKAGE DESCRIPTIO F Package 20-Lead Plastic TSSOP (4.4mm) (LTC DWG # 05-08-1650) 6.40 – 6.60* (.252 – .260) 1.05 ±0.10 6.60 ±0.10 20 19 18 17 16 15 14 13 12 11 4.50 ±0.10 0.45 ±0.05 6.40 (.252) BSC 0.65 BSC 1 2 3 4 5 6 7 8 9 10 RECOMMENDED SOLDER PAD LAYOUT 4.30 – 4.50** (.169 – .177) 0.09 – 0.20 (.0035 – .0079) 0.25 REF 1.10 (.0433) MAX 0° – 8° 0.65 (.0256) BSC 0.50 – 0.75 (.020 – .030) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2.
PAGE 14
LT1129/LT1129-3.3/LT1129-5 U PACKAGE DESCRIPTIO Q Package 5-Lead Plastic DD Pak (LTC DWG # 05-08-1461) .256 (6.502) .060 (1.524) TYP .060 (1.524) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) 15° TYP .060 (1.524) .183 (4.648) +.008 .004 –.004 +0.203 0.102 –0.102 .059 (1.499) TYP .330 – .370 (8.382 – 9.398) ( ) .095 – .115 (2.413 – 2.921) .075 (1.905) .300 (7.620) +.012 .143 –.020 +0.305 3.632 –0.
PAGE 15
LT1129/LT1129-3.3/LT1129-5 U PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 8 .245 MIN .160 ±.005 7 5 6 .053 – .069 (1.346 – 1.752) .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP 1 2 3 INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE .050 (1.270) BSC .014 – .019 (0.355 – 0.483) TYP .010 – .020 × 45° (0.254 – 0.508) 4 RECOMMENDED SOLDER PAD LAYOUT NOTE: 1.
PAGE 16
LT1129/LT1129-3.3/LT1129-5 U TYPICAL APPLICATIO T Package 5-Lead Plastic TO-220 (Standard) (LTC DWG # 05-08-1421) .165 – .180 (4.191 – 4.572) .147 – .155 (3.734 – 3.937) DIA .390 – .415 (9.906 – 10.541) .045 – .055 (1.143 – 1.397) .230 – .270 (5.842 – 6.858) .570 – .620 (14.478 – 15.748) .460 – .500 (11.684 – 12.700) .620 (15.75) TYP .330 – .370 (8.382 – 9.398) .700 – .728 (17.78 – 18.491) SEATING PLANE .152 – .202 .260 – .320 (3.861 – 5.131) (6.60 – 8.13) .095 – .115 (2.413 – 2.921) .155 – .