May 2009 Doc ID 12236 Rev 9 1/20
20
ST1S06xx
Synchronous rectification with inhibit, 1.5 A, 1.5 MHz fixed or
adjustable, step-down switching regulator
Features
■ Step-down current mode PWM (1.5 MHz) DC-
DC converter
■ 2% DC output voltage tolerance
■ Synchronous rectification
■ Inhibit function
■ Internal soft start
■ Typical efficiency: > 90 %
■ 1.5 A output current capability
■ Not switching quiescent current: max 1.5 mA
over temperature range
■ R
DS(ON)
typ.150 mΩ
■ Uses tiny capacitors and inductors
■ Operative junction temp. - 30 °C to 125 °C
■ Available in DFN6D (3x3 mm) exposed pad
Description
The ST1S06xx is a step down DC-DC converter
optimized for powering low-voltage digital core in
HDD applications and, generally, to replace the
high current linear solution when the power
dissipation may cause an high heating of the
application environment. It provides up to 1.5 A
over an input voltage range of 2.7 V to 6 V. An high
switching frequency (1.5 MHz) allows the use of
tiny surface-mount components: as well as the
resistor divider to set the output voltage value,
only an inductor and two capacitors are required.
Besides, 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
thermal protected and current limited to prevent
damages due to accidental short circuit. The
ST1S06xx is available in DFN6D (3x3 mm)
package.
DFN6D (3x3 mm)
Table 1. Device summary
Part numbers Marking Order codes Package
ST1S06 ST1S06 ST1S06PUR DFN6D (3 x 3 mm)
ST1S06A ST1S06A ST1S06APUR DFN6D (3 x 3 mm)
ST1S06XX12 1S0612 ST1S06PU12R DFN6D (3 x 3 mm)
ST1S06XX33 1S0633 ST1S06PU33R DFN6D (3 x 3 mm)
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