µModule Regulator Powers Data Converters & High Speed Transceivers

The µModule regulator combines a 36V synchronous step-down switcher, powering a 5A linear post-regulator in a compact 15mm x 15mm x 4.92mm BGA package. To minimize power dissipation and voltage drop across the linear regulator, the linear regulator automatically adjusts the output voltage of the internal synchronous regulator.

A tri-state digital interface determines the LTM8028’s output voltage, which is adjustable from 0.8V to 1.8V in 50mV increments. Output voltage regulation is ±1.5% accurate over temperature. Output noise is just 40µVRMS over the 10Hz to 100kHz frequency range. The step-down regulator features a user-adjustable current limit accurate within ±10% and adjustable switching frequency between 200kHz to 1MHz, with the option to synchronize to an external clock in the same range.

The LTM8028 is guaranteed to operate over the -40°C to +125°C and -55°C to +125°C internal temperature range. The LTM8028 is available for immediate delivery from stock, with priced starting at $14.20 each for 1,000 piece quantities.

LTM8028 Key Features:

•Low Noise Step-Down Module
o13dB Better SFDR (Spurious Free Dynamic Range) Compared to Typical Switcher
o<1mV Output Ripple

•6V to 36V VIN Range

•Internally Linked Switcher & LDO VOUT

•3-Pin Tri-State I/F Sets VOUT from 0.8V to 1.8V in 50mV Increments
o±1.5% Accuracy Over Temperature

•Parallelable up to 10A