TPS62916数据手册TI中文资料规格书

描述 Description

The TPS6291x devices are a family of high-efficiency, low noise, and low ripple current mode synchronous buck converters. The devices are designed for noise sensitive applications that normally use an LDO for post regulation such as high-speed ADCs, clock and jitter cleaner, serializer, de-serializer, and radar applications.

To reduce the output voltage ripple, the device loop compensation is designed to operate with an optional second-stage ferrite bead L-C filter. Low-frequency noise levels, similar to a low-noise LDO, are further achieved by filtering the internal voltage reference with a capacitor connected to the NR/SS pin. Combined, these features allow for an output voltage ripple below 10 µVRMS.

The device operates at a fixed switching frequency of 2.2 MHz, 1.4 MHz, or 1 MHz, and can be synchronized to an external clock. An optional spread spectrum modulation scheme spreads the DC/DC switching frequency over a wider span, which lowers the mixing spurs.

特性 Features

• Low output 1/f noise 65 dB (up to 100 kHz)
• 2.2-MHz, 1.4-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 with 30-dB attenuation (optional)
• Spread spectrum modulation (optional)
• 3.0-V to 17-V input voltage range
• 0.8-V to 5.5-V output voltage range
• 25-mΩ/6.5-mΩ R DSon
• Output voltage accuracy of ±1% over temperature
• 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
• 2.5-mm × 3.0-mm QFN with 0.5-mm pitch
• Create a custom design using the TPS6291x with the WEBENCH Power Designer