ST1S03A
1.5A, 1.5 MHz Adjustable, with inhibit function
Step-down switching regulator in DFN6 3x3
Features
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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: > 85%
Inhibit function
1.5A Output current capability
Not switching quiescent current: max 1.5mA
over temperature range
Switch V
DS
: max 200mV @ I
SW
=750mA
Uses tiny capacitors and inductors
Available in DFN6 3x3 exposed pad
dissipation may cause an high heating of the
application environment. It provides up to 1.5A
over an input voltage range of 3V to 5.5V. 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 ST1S03A is
available in DFN6 (3x3).
DFN6 (3x3)
Description
The ST1S03A 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
Order codes
Part number
ST1S03APMR
ST1S03AIPMR
ST1S03APUR
ST1S03AIPUR
May 2007
Packaging
Tape & reel
Tape & reel
Tape & reel
Tape & reel
Rev. 3
Package
DFN6 (3x3 mm)
DFN6 (3x3 mm)
DFN6D (3x3 mm)
DFN6D (3x3 mm)
1/14
www.st.com
14
Contents
ST1S03A
Contents
1
2
3
4
5
6
7
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/14
Pin configuration
ST1S03A
2
Figure 2.
Pin configuration
Pin configuration (top view)
ST1S03A
ST1S03AI
Table 1.
Pin N°
1
2
3
4
5
6
Pin description
Symbol
V
FB
GND
SW
V
IN_SW
V
IN_A
N.C./INH
Voltage of feedback
System ground
Output of the internal power switch
Power supply for the mosfet switch
Power supply for the analog circuit
Not connected / or inhibit
Note
4/14
ST1S03A
Maximum ratings
3
Table 2.
Maximum ratings
Absolute maximum ratings
Parameter
Positive power supply voltage
Positive power supply voltage
Max voltage of inhibit pin
Max. voltage of output pin
Feedback voltage
Common mode input voltage
Max junction temperature
Storage temperature range
Lead temperature (soldering) 10 sec
Value
-0.3 to 7
-0.3 to 7
-0.3 to 6
-0.3 to 7
2.5
1
150
-25 to 150
300
Unit
V
V
V
V
V
mA
°C
°C
°C
Symbol
V
IN_SW
V
IN_A
V
INH
SWITCH
Voltage
V
FB
I
VFB
T
J
T
STG
T
LEAD
Note:
Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Functional Operation under these conditions is not implied.
Thermal data
Parameter
Thermal resistance junction-ambient
Thermal resistance junction-case
Value
10
55
Unit
°C/W
°C/W
Table 3.
Symbol
R
thJA
R
thJC
5/14
FPGA/CPLD
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