ST1S06
Synchronous rectification with inhibit, 1.5A, 1.5 MHz fixed or
adjustable, step-down switching regulator in DFN6 3x3
General features
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Step-down current mode PWM (1.5MHz) DC-
DC converter
2% DC output voltage tolerance
Synchronous rectification
Inhibit function
Internal soft start
Typical efficiency:> 90%
1.5A Output current capability
Not switching quiescent current: max 1.5mA
over temperature range
R
DS
ON typ150m
Ω
Uses tiny capacitors and inductors
Operative junction temp. -30°C to 125°C
Available in DFN6 3x3 exposed pad
high current linear solution when the power
dissipation may cause an high heating of the
application environment. It provides up to 1.5A
over an input voltage range of 2.7V to 6V. 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 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
ST1S06 is available in DFN6 3x3 package.
DFN6 (3x3mm)
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
Order code
Part number
ST1S06PM
ST1S06PU
ST1S06APM
ST1S06PM12
ST1S06PM33
ST1S06APU
ST1S06PU12
ST1S06PU33
April 2007
Packaging
ST1S06PMR
ST1S06PUR
ST1S06APMR
ST1S06PM12R
ST1S06PM33R
ST1S06APUR
ST1S06PU12R
ST1S06PU33R
Rev. 5
Package
DFN6 (3x3 mm)
DFN6D (3x3 mm)
DFN6 (3x3 mm)
DFN6 (3x3 mm)
DFN6 (3x3 mm)
DFN6D (3x3 mm)
DFN6D (3x3 mm)
DFN6D (3x3 mm)
1/19
www.st.com
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Contents
ST1S06
Contents
1
2
3
4
5
6
7
8
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2/19
Pin configuration
ST1S06
2
Figure 2.
Pin configuration
Pin configuration (top view)
ST1S06
ST1S06A
Note:
Table 1.
Pln n°
1
2
3
4
5
6
* Pin 1 is V
FB
for ADJ version and V
O
for Fixed version
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
4/19
ST1S06
Maximum ratings
3
Table 2.
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
> 1.6V)
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 3
-0.3 to 6
-40 to 150
-65 to 150
260
Unit
V
V
V
V
V
V
°C
°C
°C
Symbol
V
IN_SW
V
IN_A
V
INH
SWITCH
Voltage
V
FB
/V
O
V
O
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
55
10
Unit
°C/W
°C/W
Table 3.
Symbol
R
thJA
R
thJC
5/19
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