Low noise, 1-mV output ripple, 5-A step-down uModule regulator supports data converters and high speed transceivers
The low output ripple minimizes random jitter in high speed data transceivers for superior bit error rate (BER) performance. When powering an analog-to-digital converter (ADC), tests showed a 13 dB improvement in spurious free dynamic range (SFDR) with the LTM8028 compared to a typical step-down regulator. The µModule regulator combines a 36 V synchronous step-down switcher, powering a 5 A linear post-regulator in a compact 15 mm x 15 mm x 4.92 mm 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 0.8 V to 1.8 V in 50 mV increments. Output voltage regulation is ±1.5% accurate over temperature. Output noise is just 40 µVRMS over the 10 Hz to 100 kHz frequency range. The step-down regulator features a user-adjustable current limit accurate within ±10% and adjustable switching frequency between 200 kHz to 1 MHz, 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.
More information about LTM8028 regulator at www.linear.com/product/LTM8028
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