TPS62912RPUR

The TPS6291x devices are a family of high-efficiency, low-noise, and low-ripple current-mode synchronous buck converters. These devices are ideal for noise-sensitive applications that typically use an LDO for post-regulation, such as high-speed ADCs, clocks and jitter cleaners, serializers, deserializers, and radar applications. The devices operate at a fixed switching frequency of 2.2MHz or 1MHz, and can synchronize to an external clock. To further reduce output voltage ripple, the devices integrate loop compensation designed to work with an optional second-stage ferrite bead L-C filter, reducing output voltage ripple to below 10µVRMS. Low-frequency noise levels approaching those of low-noise LDOs can be achieved by filtering the internal voltage reference with a capacitor connected to the NR/SS pin. An optional spread-spectrum modulation scheme spreads the DC/DC switching frequency over a wider range, thereby reducing mixed-signal spurs.

Applications

• Telecom Infrastructure
• Test and Measurement
• Medical

Key features

• Low output 1/f noise <20µV RMS (100Hz to 100kHz)
• Low output voltage ripple <10µV RMS with ferrite bead
• High PSRR >65dB (up to 100kHz)
• 2.2MHz or 1MHz fixed-frequency peak current mode control
• External clock synchronization (optional)
• Integrated loop compensation supporting ferrite bead for 2nd-order L-C filter with 30dB attenuation (optional)
• Spread spectrum modulation (optional)
• 3.0V to 17V input voltage range
• 0.8V to 5.5V output voltage range
• 57mΩ/20mΩ RDSon
• ±1% output voltage accuracy
• Precision enable input for:
• User-defined UVLO
• Accurate sequencing
• Adjustable soft-start
• Power good output
• Output discharge (optional)
• -40°C to 150°C junction temperature range
• 2.0mm×2.0mm QFN, 0.5mm pitch