AMOLED bias supply in a 3×3 mm footprint
The Texas Instruments TPS65632RTER is a triple-output DC-DC converter purpose-built for AMOLED display power. It generates the three bias rails an AMOLED panel needs: a fixed 4.6 V positive supply, an adjustable negative rail from -1.5 V down to -5.4 V, and a second adjustable positive rail from 5.8 V up to 7.7 V. The input range runs from 2.9 V to 4.5 V, matching a single-cell Li-ion battery or a regulated 3.3 V bus. Packaged in a 16-pin WFQFN with exposed pad measuring 3 mm × 3 mm, it fits the tight PCB real estate behind a display module.
Output rails and what they drive
The 4.6 V rail powers the source driver IC. The negative rail (-1.5 V to -5.4 V) biases the gate-off voltage for the TFT backplane; the adjustable range lets the designer match the panel's threshold voltage, which varies with panel size and oxide TFT process. The second positive rail (5.8 V to 7.7 V) supplies the gate-on voltage for the pixel TFTs. Getting any of these rails wrong means the panel either fails to light or shows visible artifacts. Because the negative output is adjustable, the same TPS65632RTER can drive different AMOLED panel generations — a common requirement when a display supplier changes panel vendor mid-program. The BOM stays the same; only the feedback resistor divider changes.
The 16-WFQFN with exposed pad (3 mm × 3 mm) is the only package variant for this part.