ST1S09PUR STMicroelectronics

ST1S09 2 A, 1.5 MHz PWM step-down switching regulator with synchronous rectification Features 1.5 MHz fixed frequency PWM with current control mode 2 A output current capability Typical efficiency: > 90% 2 % DC output voltage tolerance Two versions available: power good or inhibit DFN6 (3 x 3 mm) Integrated output over-voltage protection Non switching quiescent current: (typ) 1.5 mA over temperature range R (typ) 100 m DSON Moreover, since the required synchronous Utilizes tiny capacitors and inductors rectifier is integrated, the number of the external Operating junction temp. -30 C to 125 C components is reduced to minimum: a resistor divider, an inductor and two capacitors. The Available in DFN6 (3 x 3 mm) exposed pad Power Good function continuously monitors the output voltage. An open drain Power Good flag is Description released when the output voltage is within regulation. In addition, a low output ripple is The ST1S09 is a step-down DC-DC converter guaranteed by the current mode PWM topology optimized for powering low output voltage and by the use of low ESR SMD ceramic applications. It supplies a current in excess of 2 A capacitors. The device is thermally protected and over an input voltage range from 2.7 V to 6 V. the output current limited to prevent damages due A high PWM switching frequency (1.5 MHz) to accidental short circuit. The ST1S09 is allows the use of tiny surface-mount components. available in the DFN6 (3 x 3 mm) package. Table 1. Device summary Order codes Package ST1S09PUR DFN6D (3 x 3 mm) (1) ST1S09APUR DFN6D (3 x 3 mm) ST1S09IPUR DFN6D (3 x 3 mm) 1. Available on request. April 2010 Doc ID 13632 Rev 4 1/18 www.st.com 18ST1S09 Contents 1 Diagram . 3 2 Pin configuration 4 3 Maximum ratings 5 4 Electrical characteristics . 6 5 Typical performance characteristics 8 6 Typical application . 11 7 Application information . 12 8 Package mechanical data 13 9 Revision history . 17 2/18 Doc ID 13632 Rev 4