ST2S06
Dual synchronous rectification with reset or inhibit, 0.5 A, 1.5 MHz
adjustable step-down switching regulator
Datasheet
-
production data
Description
The ST2S06A33 and ST2S06B are dual step-
down DC-DC converters optimized for powering
low-voltage digital cores in ODD applications and,
generally, to replace high current linear solutions
when the power dissipation may cause high
heating of the application environment. It provides
up to 0.5 A over an input voltage range of 2.5 V to
5.5 V.
A high switching frequency of 1.5 MHz allows the
use of tiny surface-mount components as well as
a resistor divider to set the output voltage value.
Only an inductor and two capacitors are required.
A low output ripple is guaranteed by the current
mode PWM topology and the utilization of low
ESR SMD ceramic capacitors. The devices are
thermally protected and current-limited to prevent
damage due to accidental short-circuit. The
ST2S06A33 and ST2S06B are available in the
QFN12L (4x4 mm) package.
QFN12L (4 x 4 mm)
Features
Step-down current mode PWM (1.5 MHz) DC-
DC converter
Fixed or adjustable output voltage from 0.8 V
2% DC output voltage tolerance
Synchronous rectification
Reset function for A version
Inhibit function for B version
Internal soft start for startup current limitation
and power ON delay of 50-100 µs
Typical efficiency: > 90%
0.5 A output current capability
Non-switching quiescent current: max 1.2 mA
over temperature range
R
DS(ON)
150 m (typ.)
Uses tiny capacitors and inductors
Available in QFN12L (4x4 mm)
Table 1. Device summary
Order codes
ST2S06A33PQR
QFN12L (4 x 4 mm)
ST2S06BPQR
Tape and reel
Package
Packaging
May 2013
This is information on a product in full production.
DocID13866 Rev 6
1/18
www.st.com
Contents
ST2S06
Contents
1
2
3
4
5
6
7
8
9
Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2/18
DocID13866 Rev 6
ST2S06
Maximum ratings
3
Maximum ratings
Table 3. Absolute maximum ratings
Symbol
V
IN_SW
V
IN_A
V
INH
Parameter
Positive power supply voltage
Positive power supply voltage
Inhibit voltage
Value
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 2.5
-0.3 to 5
+1 to -1
150
-65 to +150
300
Unit
V
V
V
V
V
V
mA
°C
°C
°C
SWITCH voltage Max. voltage of output pin
V
FB1,2
/V
O1
V
O1
Feedback voltage/output voltage
Output voltage (for V
O
> 1.6 V)
Current into VFB
Common mode input voltage
pin
T
J
T
STG
T
LEAD
Max junction temperature
Storage temperature range
Lead temperature (soldering) 10 sec.
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 4. Thermal data
Symbol
R
thJC
R
thJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
Value
10
60
Unit
°C/W
°C/W
Table 5. ESD performance
Symbol
ESD
Parameter
ESD protection voltage
Test conditions
HBM-DH11C
Value
4
Unit
kV
DocID13866 Rev 6
5/18
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