1 Features
• Low output 1/f noise < 20μVRMS (100Hz to
100kHz)
• Low output voltage ripple < 10μVRMS after ferrite
bead
• High PSRR of > 65dB (up to 100kHz)
• 2.2MHz, 1.4MHz, or 1.0MHz fixed frequency peak
current mode control
• Synchronizable with external clock (optional)
• Integrated loop compensation supports ferrite
bead for second stage 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
• 25mΩ/7mΩ RDSon
• 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 125°C junction temperature range
• 4.0mm × 4.7mm × 3.0mm QFN
• Create a custom design using the TPSM8291x
with the WEBENCH® Power Designer

2 Applications
• Telecom infrastructure
• Test and measurement
• Aerospace and defense (radar, avionics)
• Medical

3 Description
The TPSM8291x devices are a family of highefficiency,
low noise, and low ripple current mode
synchronous buck modules. 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. Lowfrequency
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 10μVRMS.
The device operates at a fixed switching frequency of
2.2MHz, 1.4MHz, or 1MHz, 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.