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LT1529

LT1529-3.3/LT1529-5

152935fb

3A Low Dropout Regulators

with Micropower

Quiescent Current

and Shutdown

The LT

1529/LT1529-3.3/LT1529-5 are 3A low dropout

regulators with micropower quiescent current and shut-

down. The devices are capable of supplying 3A of output

current with a dropout voltage of 0.6V. 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 is well controlled; it

does not rise in dropout as it does with many other low

dropout PNP regulators.

Other features of the LT1529 /LT1529-3.3/LT1529-5 in-

clude the ability to operate with small output capacitors.

They are stable with 22µF on the output while most older

devices require up to 100µF for stability. Small ceramic

capacitors can be used, enhancing manufacturabiltiy.

Also the input may be connected to voltages lower than the

output voltage, including negative voltages, without re-

verse current flow from output to input. This makes the

LT1529/LT1529-3.3/LT1529-5 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 and 5-lead DD packages.

■

Dropout Voltage: 0.6V at I

OUT

= 3A

■

Output Current: 3A

■

Quiescent Current: 50µA

■

No Protection Diodes Needed

■

Adjustable Output from 3.8V to 14V

■

3.3V and 5V Fixed Output Voltages

■

Controlled Quiescent Current in Dropout

■

Shutdown I

= 16µA

■

Stable with 22µF Output Capacitor

■

Reverse Battery Protection

■

No Reverse Current

■

Thermal Limiting

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (V)

0.1

0.2

0.3

0.4

0.6

0.5

1.0 1.5 2.0

LT1529 • TA02

2.5 3.0

0.5

Dropout Voltage

5V Supply with Shutdown

■

High Efficiency Regulator

■

Regulator for Battery-Powered Systems

■

Post Regulator for Switching Supplies

■

5V to 3.3V Logic Regulator

> 5.5V

22µF

LT1529 • TA01

OUTPUT

SENSE

LT1529-5

SHDN

GND

SHDN

(PIN 4)

<0.25

>2.8

OUTPUT

OFF

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO

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

All other trademarks are the property of their respective owners.

Summary of content (12 pages)

PAGE 1
LT1529 LT1529-3.3/LT1529-5 3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Dropout Voltage: 0.6V at IOUT = 3A Output Current: 3A Quiescent Current: 50µA No Protection Diodes Needed Adjustable Output from 3.8V to 14V 3.3V and 5V Fixed Output Voltages Controlled Quiescent Current in Dropout Shutdown IQ = 16µA Stable with 22µF Output Capacitor Reverse Battery Protection No Reverse Current Thermal Limiting The LT ®1529/LT1529-3.
PAGE 2
LT1529 LT1529-3.3/LT1529-5 W W W AXI U U ABSOLUTE RATI GS (Note 1) Input Voltage ...................................................... ±15V* OUTPUT Pin Reverse Current .............................. 10mA SENSE Pin Current .............................................. 10mA ADJ Pin Current ................................................... 10mA SHDN Pin Input Voltage (Note 2) .............. 6.5V, – 0.6V SHDN Pin Input Current (Note 2) .......................... 5mA Output Short-Circuit Duration ...
PAGE 3
LT1529 LT1529-3.3/LT1529-5 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the operating temperature range, otherwise specificatons are at TA = 25°C.
PAGE 4
LT1529 LT1529-3.3/LT1529-5 U W TYPICAL PERFOR A CE CHARACTERISTICS Dropout Voltage 0.8 0.9 0.7 DROPOUT VOLTAGE (V) 0.7 0.6 0.5 0.4 0.3 VIN = 6V RL = ∞ A: ILOAD = 3A E: ILOAD = 100mA B: ILOAD = 1.5A F: ILOAD = 10mA C: ILOAD = 700mA D: ILOAD = 300mA A 0.6 0.5 B 0.4 C 0.3 D 0.2 E 0.2 0 0.5 2.5 1.5 2.0 1.0 OUTPUT CURRENT (A) 0 – 50 – 25 3.
PAGE 5
LT1529 LT1529-3.3/LT1529-5 U W TYPICAL PERFOR A CE CHARACTERISTICS LT1529-5 GND Pin Current LT1529-3.3 GND Pin Current 3.5 3.0 RLOAD = 330Ω ILOAD = 10mA* 2.5 2.0 RLOAD = 11Ω ILOAD = 300mA* 1.5 RLOAD = 33Ω ILOAD = 100mA* 1.0 RLOAD = 500Ω ILOAD = 10mA* 3.0 2.5 RLOAD = 16.6Ω ILOAD = 300mA* 2.0 1.5 RLOAD = 50Ω ILOAD = 100mA* 1.0 0.5 0 3.5 0.5 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 9 8 0 10 RLOAD = 10Ω ILOAD = 500mA* 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 100 80 60 50 RLOAD = 4.
PAGE 6
LT1529 LT1529-3.3/LT1529-5 U W TYPICAL PERFOR A CE CHARACTERISTICS SHDN Pin Input Current SHDN Pin Current 10 VSHDN = 0V VADJ = VOUT = 3.
PAGE 7
LT1529 LT1529-3.3/LT1529-5 U W TYPICAL PERFOR A CE CHARACTERISTICS Load Regulation LT1529-5 Transient Response LT1529-5 Transient Response 5 –10 –15 –20 VIN = VOUT (NOMINAL) + 1V ∆ILOAD = 100mA to 3A VADJ = VOUT –25 – 50 – 25 50 25 75 0 TEMPERATURE (°C) 100 125 0.1 VIN = 6V CIN = 3.3µF COUT = 47µF OUTPUT VOLTAGE DEVIATION (V) –5 LOAD CURRENT (A) LOAD REGULATION (mV) LT1529-3.3 LT1529 0.2 0 – 0.1 – 0.2 3 2 1 0.1 0 – 0.1 – 0.
PAGE 8
LT1529 LT1529-3.3/LT1529-5 U U U PI FU CTIO S function of voltage appears in the Typical Performance Characteristics. If the SHDN pin is not used it can be left open circuit. The device will be active, output on, if the SHDN pin is not connected. VIN (Pin 5): Input Pin. Power is supplied to the device through the VIN pin. The VIN pin should be bypassed to ground if the device is more than six inches away from the main input filter capacitor.
PAGE 9
LT1529 LT1529-3.3/LT1529-5 U W U UO APPLICATI 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: 1. Output current multiplied by the input/output voltage differential: IOUT • (VIN – VOUT), and 2. Ground pin current multiplied by the input voltage: IGND • VIN .
PAGE 10
LT1529 LT1529-3.3/LT1529-5 U W U UO APPLICATI S I FOR ATIO micropower device and output transient response will be a function of output capacitance. See the Transient Response curves in the Typical Performance Characteristics. Larger values of output capacitance will decrease the peak deviations and provide improved output transient response for larger load current deltas.
PAGE 11
LT1529 LT1529-3.3/LT1529-5 W U U UO APPLICATI S I FOR ATIO will typically drop to less than 2µA (see Figure 4). The state of the SHDN pin will have no effect on the reverse output current when the output is pulled above the input. 5 VOUT = 3.3V (LT1529-3.3) VOUT = 5V (LT1529-5) 4 INPUT CURRENT (µA) In some applications it may be necessary to leave the input to the LT1529 unconnected when the output is held high. This can happen when the LT1529 is powered from a rectified AC source.
PAGE 12
LT1529 LT1529-3.3/LT1529-5 U PACKAGE DESCRIPTIO 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) .095 – .115 (2.413 – 2.921) SEATING PLANE .152 – .202 .260 – .320 (3.861 – 5.131) (6.60 – 8.13) .155 – .