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LT1533

Ultralow Noise

1A Switching Regulator

FEATURES

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s

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DESCRIPTION

The LT

廬

1533 is a new class of switching regulator designed

to reduce conducted and radiated electromagnetic interfer-

ence (EMI). Ultralow noise and EMI are achieved by providing

user control of the output switch slew rates. Voltage and

current slew rates can be independently programmed to

optimize switcher harmonic content versus efficiency. The

LT1533 can reduce high frequency harmonic power by as

much as 40dB with only minor losses in efficiency.

The LT1533 utilizes a dual output switch current mode

architecture optimized for low noise topologies. The IC

includes two 1A power switches along with all necessary

oscillator, control and protection circuitry. Unique error amp

circuitry can regulate both positive and negative voltages.

The internal oscillator may be synchronized to an external

clock for more accurate placement of switching harmonics.

Protection features include cycle by cycle current limit pro-

tection, undervoltage lockout and thermal shutdown.

Low minimum supply voltage and low supply current during

shutdown make the LT1533 well suited for portable applica-

tions. The part may also be forced into a 50% duty cycle mode

for unregulated applications. The LT1533 is available in the

16-pin narrow SO package.

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Greatly Reduced Conducted and Radiated EMI

(<100

碌

V

P-P

in Typical Application)

Low Switching Harmonic Content

Independent Control of Switch Voltage and

Current Slew Rates

Two 1A Current Limited Power Switches

Regulates Positive and Negative Voltages

20kHz to 250kHz Oscillator Frequency

Easily Synchronized to External Clock

Wide Input Voltage Range: 2.7V to 23V

Low Shutdown Current: 12碌A(chǔ) Typical

Easier Layout than with Conventional Switchers

Outputs Can Be Forced to 50% Duty Cycle for

Unregulated Applications

APPLICATIONS

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Precision Instrumentation Systems

Isolated Supplies for Industrial Automation

Medical Instruments

Wireless Communications

Single Board Data Acquisition Systems

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

TYPICAL APPLICATION

Low Noise 5V to 12V Forward Push-Pull DC/DC Converter

5V

+

33碌F

11

3

820pF

4

5

16.9k

6

SHDN

DUTY

SYNC

C

T

R

T

14

V

IN

COL A

COL B

PGND

LT1533

R

VSL

R

CSL

15k

10

V

C

GND

9

NFB

8

FB

2

T1

1N4148

L1

300碌H

B

L2

33碌H

C1

47碌F

16V

A

12V

150mA

C2

33碌F

20V

12V Output Noise (BW = 100MHz)

1N4148

15

Note 1

16

13

12

7

15k

15k

21.5k, 1%

+

+

A

100碌V/DIV

B

2mV/DIV

1533 TA01

0.015碌F

1000pF

2.49k

1%

C1: SANYO OS-CON

C2: AVX TPS TANTALUM

L1: COILTRONICS CTX300-2

L2: COILCRAFT DT1608C-333

T1: COILTRONICS CTX02-13834

NOTE 1: 25nH TRACE INDUCTANCE

OR COILCRAFT B07T

U

U

U

<100碌V

P-P

2碌s/DIV

1533 TA02

1

next

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