LTM8080

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

40VIN, Dual 500mA or Single 1A Ultralow

Noise, Ultrahigh PSRR μModule Regulator

The LTM®8080 is a 40VIN, dual 500mA or single 1A

ultralow noise, ultrahigh PSRR µModule® regulator.

LTM8080 has cascaded architecture which contains a

40VIN step-down Silent Switcher regulator with an inte-

grated EMI noise shield followed by dual high-perfor-

mance low dropout linear regulators. The dual LDOs fea-

ture ADI’s ultralow noise and ultrahigh PSRR architecture

for powering noise-sensitive applications. The LTM8080

is an integrated solution comprised of a switcher and

LDOs, which offers both advantages while maintaining a

small size and significantly reduced PCB layout sensitivity.

The package includes the controllers, power switches,

inductors, and support components. In addition, the

LTM8080 has a built-in voltage tracking function that

automatically sets VBUS to either 2.5V nominal or 1V

higher than VOUT1, whichever is greater, to achieve supe-

rior noise performance and minimize power dissipation.

The LTM8080 is packaged in a thermally enhanced,

compact (9mm × 6.25mm × 3.32mm) over-molded

Ball Grid Array (BGA) package suitable for automated

assembly by standard surface mount equipment and is

RoHS compliant.

Noise Spectral Density

APPLICATIONS

n

Dual LDOs Powered by an Integrated Switching

Step-Down Regulator

n

Low Noise Silent Switcher® Architecture with an

Integrated EMI Noise Shield

n

CISPR22 Class B and CISPR25 Class 5 Compliant

n

Ultralow Output RMS Noise: <1μVRMS (10Hz to 100kHz)

n

Ultralow Output Spot Noise: 2nV/√Hz at 10kHz

n

Ultrahigh PSRR: 80dB at 100kHz

n

Wide Input Voltage: 3.5V to 40V

n

Wide Output Voltage: 0V to 8V

n

Dual 500mA Continuous Current at TA = 85°C

n

Voltage Tracking Function to Minimize Power Loss

n

100μA SET Pin Current with ±1% Initial Accuracy

n

Selectable Switching Frequency: 200kHz to 2.2MHz

n

External Synchronization

n

Programmable Power Good

n

Parallelable for Lower Noise and Higher Current

n

9mm × 6.25mm × 3.32mm BGA

n

RF Power Supplies: PLLs, VCOs, Mixers, LNAs

n

Very Low Noise Instrumentation

n

High Speed/High Precision Data Converters

n

Medical Applications: Imaging, Diagnostics

All registered trademarks and trademarks are the property of their respective owners. Protected

by U.S. patents, including 11258356B2.

8080 TA01a

VIN

RUN

RT

VIN

6V TO

40V

PINS THAT ARE NOT USED IN THIS CIRCUIT: SS, PG1, PG2

SYNC

GND

LTM8080

10µF

33.2k

1µF

(1.2MHz)

VOUT1

SET1

VSNS1

PGFB1

LDO1

LDO2

VOUT2

SET2

VSNS2

PGFB2

33.2k

33.2k

10µF

4.7µF

VOUT1

3.3V

500mA

VBUS

10µF

4.7µF

VOUT2

3.3V

500mA

VBUS

INTEGRATED EMI

NOISE SHIELD

VBUS

VIN = 12V

RSET = 33.2k

IOUT = 500mA

CSET = 4.7F

CSET = 1F

CSET = 0.47F

CSET = 0.047F

FREQUENCY (Hz)

10

100

1k

10k

100k

1M

0.1

1

10

100

1k

8080 TA01b

COUT = 10F

IBUS = 0A

Dual 3.3V/500mA from 6V to 40V Input