ST2S08B Dual synchronous rectification, 1.5 A, 1.5 MHz adjustable step-down switching regulator Datasheet production data Features Step-down current mode PWM (1.5 MHz) DC- DC converter Adjustable output voltage from 0.8 V 2 % DC output voltage tolerance Synchronous rectification Integrated current limit QFN12L (4 x 4 mm) Inhibit function Soft-start for start delay of 800 s typ. Typical efficiency: > 80 % at V = 1.2 V OUT 1.5 A output current capability ST2S08B is available in the QFN12L (4 x 4 mm) Non-switching quiescent current: max 1.5 mA package. over temperature range R 150 m (typ.) DS(ON) Uses tiny capacitors and inductors Available in QFN12L (4 x 4 mm) Description The ST2S08B is a dual step-down DC-DC converter optimized for powering low-voltage digital cores in ODD applications and, generally, to replace the high current linear solution when the power dissipation may cause a high heating of the application environment. It provides up to 1.5 A over an input voltage range of 3 V to 5.5 V. A high switching frequency of 1.5 MHz allows the use of tiny surface-mounted components as well as a resistor divider to set the output voltage value. Only an inductor and two capacitors are required. A low output ripple is guaranteed by the current mode PWM topology and the utilization of low ESR SMD ceramic capacitors. The device is thermally protected and current limited. The Table 1. Device summary Order code Package Packaging ST2S08BPQR QFN12L (4 x 4 mm) Tape and reel May 2012 Doc ID 18290 Rev 2 1/18 This is information on a product in full production. www.st.com 18Contents ST2S08B Contents 1 Diagram . 3 2 Pin configuration . 4 3 Maximum ratings 5 4 Electrical characteristics . 6 5 Typical application 7 6 Typical performance characteristics 8 7 General information 10 8 Application information . 11 8.1 Introduction . 11 8.2 Programming the output voltage . 11 8.3 Inductor selection . 11 8.4 Input and output capacitor selection . 12 8.5 Layout considerations 12 9 Package mechanical data 13 10 Revision history . 17 2/18 Doc ID 18290 Rev 2