ST1S06XX Datasheet, PDF (1/20 Pages) STMicroelectronics – Synchronous rectification with inhibit, 1.5 A, 1.5 MHz fixed or adjustable, step-down switching regulator

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 exposed pad
Description
The ST1S06 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
DFN6D (3x3 mm)
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
ST1S06 is available in DFN6D 3x3 package.
Table 1. Device summary
Part numbers
ST1S06
ST1S06A
ST1S06XX12
ST1S06XX33
Order codes
ST1S06PUR
ST1S06APUR
ST1S06PU12R
ST1S06PU33R
Package
DFN6D (3x3 mm)
DFN6D (3x3 mm)
DFN6D (3x3 mm)
DFN6D (3x3 mm)
April 2008
Rev 7
1/20
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