ST1S06xx
Synchronous rectification with inhibit, 1.5 A, 1.5 MHz fixed or
adjustable, step-down switching regulator
Features
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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
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)
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.
Table 1.
Device summary
Marking
ST1S06
ST1S06A
1S0612
1S0633
Part numbers
ST1S06
ST1S06A
ST1S06XX12
ST1S06XX33
Order codes
ST1S06PUR
ST1S06APUR
ST1S06PU12R
ST1S06PU33R
Package
DFN6D (3 x 3 mm)
DFN6D (3 x 3 mm)
DFN6D (3 x 3 mm)
DFN6D (3 x 3 mm)
May 2009
Doc ID 12236 Rev 9
1/20
www.st.com
20
Contents
ST1S06xx
Contents
1
2
3
4
5
6
7
8
9
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
Doc ID 12236 Rev 9
Pin configuration
ST1S06xx
2
Figure 2.
Pin configuration
Pin configuration (top view)
ST1S06
ST1S06A
* Pin 1 is V
FB
for ADJ version and V
O
for Fixed version
Table 2.
Pin n°
1
2
3
4
5
6
Pin description
Symbol
FB/V
O
GND
SW
V
IN_SW
V
IN_A
V
INH
Feedback voltage / output voltage
System ground
Switching pin
Power supply for the mosfet switch
Power supply for analogic circuit
Inhibit pin to turn off the device
Exposed pad to be connected to GND
Note
4/20
Doc ID 12236 Rev 9
ST1S06xx
Maximum ratings
3
Table 3.
Symbol
V
IN_SW
V
IN_A
V
INH
SWITCH
voltage
V
FB
/V
O
V
O
T
J
T
STG
T
LEAD
Maximum ratings
Absolute maximum ratings
Parameter
Positive power supply voltage
Positive power supply voltage
Inhibit voltage
Max. voltage of output pin
Feedback voltage
Output voltage (for V
O
> 1.6 V)
Max junction temperature
Storage temperature range
Lead temperature (soldering) 10 sec
Value
-0.3 to 7
-0.3 to 7
-0.3 to V
I
+ 0.3
-0.3 to 7
-0.3 to 2.5
-0.3 to 6
-40 to 150
-65 to 150
260
Unit
V
V
V
V
V
V
°C
°C
°C
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
55
10
Unit
°C/W
°C/W
Table 4.
Symbol
R
thJA
R
thJC
Doc ID 12236 Rev 9
5/20
Industrial Control Electronics
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