Texas Instruments TPS62912

Beschreibung

The TPS6291x devices are a family of high efficiency low noise and low ripple synchronous buck converters. The devices are ideal for noise sensitive applications that would normally use an LDO for post regulation such as high speed ADCs, Clock and Jitter Cleaner, Serializer, De-serializer, and Radar applications. The device operates at a fixed switching frequency of 2.2 MHz or 1 MHz, and can be synchronized to an external clock. To further reduce the output voltage ripple, the device integrates loop compensation to operate with an optional second-stage ferrite bead L-C filter. This allows an output voltage ripple below 10 μVRMS. Low-frequency noise levels, similar to a low-noise LDO, are achieved by filtering the internal voltage reference with a capacitor connected to the NR/SS pin. The optional spread spectrum modulation scheme spreads the DC/DC switching frequency over a wider span, which lowers the mixing spurs.

Eigenschaften

• Low output 1/f noise < 20 µVRMS (100 Hz to 100 kHz)
• Low output voltage ripple < 10 µVRMS after ferrite bead
• High PSRR of > 65 dB (up to 100 kHz)
• 2.2-MHz or 1-MHz fixed frequency peak current mode control
• Synchronizable with external clock (optional)
• Integrated loop compensation supports ferrite bead for second stage L-C filter (optional)
• Spread spectrum modulation (optional)
• 3.0-V to 17-V input voltage range
• 0.8-V to 5.5-V output voltage range
• 57-mΩ/20-mΩ RDSon
• Output voltage accuracy of ±1%
• Precise enable input allows
• User-defined undervoltage lockout
• Exact sequencing
• Adjustable soft start
• Power-good output
• Output discharge (optional)
• -40°C to 150°C junction temperature range
• 2.0-mm x 2.0-mm QFN with 0.5-mm pitch
• Create a custom design using the TPS6291x with the WEBENCH Power Designer

Typische Anwendungen

• Telecom infrastructure
• Test and measurement
• Medical

Weiterführende Informationen

• Datenblatt
• Produktseite des IC-Herstellers