ST1S09| Datasheet

ST1S09, ST1S09IPUR, ST1S09PUR

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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 Integrated output over-voltage protection Non switching quiescent current: (typ) 1.5 mA over temperature range RDSON (typ) 100 m Utilizes tiny capacitors and inductors Operating junction temp. -30 C to 125 C Available in DFN6 (3x3 mm) exposed pad Moreover, since the required synchronous rectifier is integrated, the number of the external components is reduced to minimum: a resistor divider, an inductor and two capacitors. The power good function continuously monitors the output voltage. An open drain power good flag is released when the output voltage is within regulation. In addition, a low output ripple is guaranteed by the current mode PWM topology and by the use of low E.S.R. SMD ceramic capacitors. The device is thermally protected and the output current limited to prevent damages due to accidental short circuit. The
ST1S09 is available in the DFN6 3x3 mm package.
DFN6 (3x3mm)

Description
The ST1S09 is a step-down DC-DC converter optimized for powering low output voltage applications. It supplies a current in excess of 2 A over an input voltage range from 2.7 V to 6 V. A high PWM switching frequency (1.5 MHz) allows the use of tiny surface-mount components.

Table 1.

Device summary
Order codes ST1S09PU ST1S09APU
(1)

Packaging ST1S09PUR ST1S09APUR ST1S09IPUR

Package DFN6D (3x3 mm) DFN6D (3x3 mm) DFN6D (3x3 mm)

ST1S09IPU
1. Available on request.

January 2008

Rev 3

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