DESCRIPTION

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 integrated

EMI noise shield followed by dual high-performance

low dropout linear regulators. The dual LDOs feature

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 superior

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.

FEATURES

- Dual LDOs Powered by an Integrated Switching Step-Down Regulator

- Low Noise Silent Switcher? Architecture with an Integrated EMI Noise Shield

- CISPR22 Class B and CISPR25 Class 5 Compliant

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

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

- Ultrahigh PSRR: 80dB at 100kHz

- Wide Input Voltage: 3.5V to 40V

- Wide Output Voltage: 0V to 8V

- Dual 500mA Continuous Current at TA = 85°C

- Voltage Tracking Function to Minimize Power Loss

- 100μA SET Pin Current with ±1 Initial Accuracy

- Selectable Switching Frequency: 200kHz to 2.2MHz

- External Synchronization

- Programmable Power Good

- Parallelable for Lower Noise and Higher Current

- 9mm × 6.25mm × 3.32mm BGA

APPLICATIONS

- RF Power Supplies: PLLs, VCOs, Mixers, LNAs

- Very Low Noise Instrumentation

- High Speed/High Precision Data Converters

- Medical Applications: Imaging, Diagnostics