ST1S03_07 Datasheet, PDF (1/17 Pages) STMicroelectronics – 1.5A, 1.5 MHz adjustable, step-down switching regulator in DFN6

ST1S03
1.5A, 1.5 MHz adjustable, step-down switching regulator in DFN6
Features
■ Step-down current mode PWM (1.5MHz)
DC-DC converter
■ 2% DC output voltage tolerance
■ Internal soft start for START-UP current
limitation and power on delay of 50-100µs
■ Typical efficiency: > 70% over all operating
conditions
■ 1.5A Output current capability
■ Not switching quiescent current: max 2.5mA
over temperature range
■ Switch V_DS: max 350mV @ I_SW=750mA
■ Uses tiny capacitors and inductors
■ Available in DFN 3x3 exposed pad
Description
The ST1S03 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 1.5A
DFN6 (3x3mm)
over an input voltage range of 3V to 16V. An high
switching frequency (1.5MHz) allows the use of
tiny surface-mount components: as well as the
resistor divider to set the output voltage value,
only an inductor, a schottky diode and two
capacitors are required. Besides, 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 thermal
protected and current limited to prevent damages
due to accidental short circuit. The ST1S03 is
available in DFN6.
Order codes
Part number
ST1S03PM
ST1S03PU
March 2007
Packaging
ST1S03PMR
ST1S03PUR
Rev. 5
Package
DFN6 (3x3 mm)
DFN6D (3x3 mm)
1/17
www.st.com
17