STODD01 Monolithic power management for high definition ODD with true shut-down, reset, and programmable step-up voltage Features 1.2 MHz DC-DC current mode PWM converter Dual step-down of up to 800 mA Single step-up of up to 700 mA 2 % DC output voltage tolerance for step-down 3 % DC output voltage tolerance for step-up Programmable step-up output voltage by S- QFN16L (4 x 4 mm.) WIRE Synchronous rectification Power save mode at light load for step-down S-Wire protocol, in the range of 6.5 V to 14 V, with Typical efficiency: > 90 % a current capability of 0.7 A. The integrated low R for N-channel and P-channel MOSFET Internal soft start with controlled inrush current DSon switches contribute to obtaining high efficiency. Reset function The enable function for the step-up section, and Enable function for step-up reset function for monitoring the input voltage, make the device particularly suitable for optical True cut-off function for step-up storage applications. The high switching Low switching quiescent current: max 2.2 mA frequency (1.2 MHz typ.) allows the use of tiny overtemperature range surface mounted components. Furthermore, a low Uses tiny capacitors and inductors output ripple is achieved by the current mode PWM topology and by the use of X7R or X5R low Available in QFN16 (4 x 4 mm.) ESR SMD ceramic capacitors. The device includes soft-start control, thermal shutdown, and Description peak current limit, to prevent damage due to accidental overload. The STODD01 is packaged The STODD01 is a complete power management in QFN16 (4 x 4 mm.). for Blu-Ray, based on high density optical storage devices. It integrates two step-down converters and one step-up. The step-down converters are optimized for powering low-voltage digital core, up to 0.8 A, in ODD applications and, generally, to replace the high current linear solution when power dissipation may cause a high heating of the application environment. The step-up provides the necessary voltage to supply the blue laser in mobile applications where only 5 V is available. The output voltage is programmable by using the Table 1. Device summary Part number Order code Marking Package STODD01 STODD01PQR ODD01 QFN16 (4 x 4 mm.) February 2011 Doc ID 17789 Rev 2 1/31 www.st.com 31Contents STODD01 Contents 1 Block diagram 3 2 Absolute maximum ratings . 4 3 Pin configuration 5 4 Typical application 6 5 Electrical characteristics . 7 6 S-wire protocol 10 7 Detailed description 14 7.1 Brief overview 14 7.2 Enable pin 14 7.3 TX pin 15 7.4 Reset function . 15 7.5 Overtemperature protection . 16 7.6 Overvoltage protection . 16 8 Typical performance characteristics . 17 9 Application information . 21 9.1 Introduction . 21 9.2 Programming the output voltage . 21 9.3 Inductor selection . 21 9.4 Input and output capacitor selection . 22 9.5 Layout considerations 23 10 Recommended PCB layout 24 11 Package mechanical data 26 12 Revision history . 30 2/31 Doc ID 17789 Rev 2