This work presents a PAM-4 transmitter (TX) for high bandwidth memory TSV (through-silicon-via) interfaces, which eliminates the static current path of conventional PAM-4 transmitters in memory interfaces. The TX features a single-ended, unterminated structure. Proposed PAM-4 driver utilizes three voltage levels (VDDL, VDDM, VDDH) to achieve four-level signaling without static current. A compact encoder, built with simple logic gates, ensures high-speed, low-power operation. Implemented in 28nm CMOS, the TX is simulated at 16 Gb/s with PRBS-31 data, achieving at least 62.6% timing margin and consuming up to 1.14mW, making it suitable for single-ended, unterminated TSV I/O applications.