DescriptionThe ST1S12Gxx is a step down DC-DC converter optimized for powering low-voltage digital cores in high current linear solution when the power dissipation may cause high heating of the application environment. It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency (1.7 MHz) allows the use of tiny surface-mount components. In addition to the resistor divider to set the output voltage value, only an inductor and two capacitors arerequired. Moreover, a low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR SMD ceramic capacitors. The device is thermally protected and the current is limited to prevent damage due to accidental short-circuit. The ST1S12Gxx is available in the TSOT23-5L package.TSOT23-5LTable 1.Device summaryPart numbersOrder codesPackageST1S12XXST1S12GRTSOT23-5LST1S12XX12ST1S12G12RTSOT23-5LST1S12XX18ST1S12G18R (1)TSOT23-5L1.Available on request.www.st.comContentsST1S12xx 2/20 Contents1Sch Features Step-down current mode PWM (1.7 MHz) DC-DC converter3% DC output voltage toleranceSynchronous rectificationFixed output voltage 1.2 V, 1.8 V, and ADJ (available on request 1.5 V, 2.5 V and 3.3 V)Enable functionInternal soft startTypical efficiency: > 90%0.7 A output current capabilityNot switching quiescent current: max 600 A over temperature rangeRDSON typ. 250 m and 400 mUses tiny capacitors and inductorsOperative junction temp. -40C to 125CAvailable in TSOT23-5L packageDescriptionThe ST1S12Gxx is a step down DC-DC converter optimized for powering low-voltage digital cores in high current linear solution when the power dissipation may cause high heating of the application environment. It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency (1.7 MHz) allows the use of tiny surface-mount components. In addition to the resistor divider to set the output voltage value, only an inductor and two capacitors arerequired. Moreover, a low outp specifications are available at: www.st.com