Multi-topology boost regulator in a 2x2 mm WSON
The Texas Instruments TPS61170DRVR is a current-mode step-up DC-DC converter that also supports buck-boost, flyback, and SEPIC topologies from a single 3 V to 18 V input rail. It delivers an adjustable output up to 38 V through an internal 960 mA switch, switching at a fixed 1.2 MHz.
38 V output ceiling and 960 mA switch — sizing the power stage
The 38 V maximum output covers common LED strings of 6 to 10 white LEDs in series, plus headroom for the current-sense resistor. The 960 mA switch current limit is the peak inductor current the internal N-channel FET can handle — the actual output current depends on the ratio of input to output voltage and the topology. In a boost configuration from a 12 V rail to 24 V, expect around 400 mA output before the current limit engages; in a SEPIC or flyback design the coupling capacitor or transformer turns ratio redefines the transfer function. The 1.2 MHz switching frequency keeps the inductor in the 4.7 µH to 22 µH range and pushes the output ripple above the AM broadcast band, simplifying input filtering for automotive or industrial environments. The fixed frequency also means the compensation network is predictable across the 3 V to 18 V input range.
The base product number TPS61170 covers multiple package and reel variants — the DRVR suffix specifies the 6-WSON (2x2 mm) package on a 3000-unit tape-and-reel.