February 2012 Doc ID 14314 Rev 5 1/20
20
ST1S12XX
ST1S12XX12, ST1S12XX18
Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or
adjustable step-down switching regulator in TSOT23-5L
Features
■Step-down current mode PWM (1.7 MHz) DC-
DC converter
■3% DC output voltage tolerance
■Synchronous rectification
■Fixed output voltage 1.2 V, 1.8 V, and ADJ
(available on request 1.5 V, 2.5 V and 3.3 V)
■Enable function
■Internal soft start
■Typical efficiency: > 90%
■0.7 A output current capability
■Not switching quiescent current: max 650 µA
over temperature range
■RDSON typ. 250 mΩ and 400 mΩ
■Uses tiny capacitors and inductors
■Operative junction temp. -40 °C to 125 °C
■Available in TSOT23-5L package
Description
The ST1S12 is a step down DC-DC converter
optimized for powering low-voltage digital cores in
HDD applications and, generally, to replace the
high current linear solution when the power
dissipation may cause high heating of the
application environment. It provides up to 0.7 A
over an input voltage range of 2.5 V to 5.5 V. A
high switching frequency (1.7 MHz) allows the
use of tiny surface-mount components. In addition
to the resistor divider to set the output voltage
value, only an inductor and two capacitors are
required. Moreover, 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 thermally protected and
the current is limited to prevent damage due to
accidental short-circuit. The ST1S12 is available
in the TSOT23-5L package.
TSOT23-5L
Table 1. Device summary
Part numbers Order codes Package
ST1S12XX ST1S12GR TSOT23-5L
ST1S12XX12 ST1S12G12R TSOT23-5L
ST1S12XX18 ST1S12G18R TSOT23-5L
www.st.com
Contents ST1S12XX, ST1S12XX12, ST1S12XX18
2/20 Doc ID 14314 Rev 5
Contents
1 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
ST1S12XX, ST1S12XX12, ST1S12XX18 Schematic
Doc ID 14314 Rev 5 3/20
1 Schematic
Figure 1. Schematic diagram
Pin configuration ST1S12XX, ST1S12XX12, ST1S12XX18
4/20 Doc ID 14314 Rev 5
2 Pin configuration
Figure 2. Pin connections (top view)
Table 2. Pin description
Pin n° Symbol Name and function
1 EN Enable pin
2 GND System ground
3 SW Switching pin
4V
IN Input supply pin
5FB/V
OFeedback voltage / or output voltage
ST1S12XX, ST1S12XX12, ST1S12XX18 Maximum ratings
Doc ID 14314 Rev 5 5/20
3 Maximum ratings
Note: Absolute maximum ratings are the values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
VIN Positive power supply voltage -0.3 to 6.5 V
VEN Enable voltage -0.3 to VIN + 0.3 V
SWITCH Voltage Max. voltage of output pin -0.3 to VIN + 0.3 V
VFB/VOFeedback voltage -0.3 to 3 V
VOOutput voltage (for VO > 1.6 V) -0.3 to 6 V
TJMax junction temperature -40 to 150 °C
TSTG Storage temperature range -65 to 150 °C
TLEAD Lead temperature (soldering) 10 sec 260 °C
Table 4. Thermal data
Symbol Parameter Value Unit
RthJA Thermal resistance junction-ambient 220 °C/W
RthJC Thermal resistance junction-case 110 °C/W
Table 5. ESD performance
Symbol Parameter Test conditions Value Unit
ESD ESD protection voltage HBM 2 kV
MM 0.3 kV
Electrical characteristics ST1S12XX, ST1S12XX12, ST1S12XX18
6/20 Doc ID 14314 Rev 5
4 Electrical characteristics
VIN = VEN = 3.6 V, CIN = 4.7 µF, CO = 10 µF, L = 2.2 µH, TJ = - 40 to 125 °C (unless
otherwise specified. Typical values are referred to 25 °C).
Table 6. Electrical characteristics for ST1S12G
Symbol Parameter Test conditions Min. Typ. Max. Unit
FB Feedback voltage TJ = -40 to 125°C 582 600 618 mV
IFB VFB pin bias current -50 50 nA
VIN Minimum input voltage IO = 10mA to 0.7A 2.5 V
IQQuiescent current VIN = VEN, VFB = 0.65V 500 650 µA
VEN = 0, TJ = -40°C to 85°C 1 µA
IOOutput current VIN = 2.5V to 5.5 V (1) 0.7 A
VEN Enable threshold Device ON, VIN = 2.5V to 5.5V 1.5 V
Device OFF 0.5
IEN Enable pin current 1 µA
%VO/ΔVIN Reference line regulation VIN = 2.5V to 5.5V (1) 0.05 0.1 %VO/ΔVIN
%VO/ΔIOReference load regulation IO = 10 mA to 700mA (1) 0.0025 0.005 %VO/mA
PWMfSPWM switching frequency 1.16 1.7 2.08 MHz
DMAX Maximum duty cycle 100 %
RDSON-N NMOS switch on resistance ISW = 100mA 0.25 0.4 Ω
RDSON-P PMOS switch on resistance ISW = 100mA 0.25 0.45 Ω
ISWL Switching current limitation (1) 1.6 A
νEfficiency (1) IO = 10mA to 100 mA, VO = 1.8V 80 %
IO = 100mA to 0.7A, VO = 1.8V 90
TSHDN Thermal shutdown 130 150 °C
THYS Thermal shutdown hysteresis 15 °C
%VO/ΔIOLoad transient response IO = 100mA to 700mA, TA = 25°C
tR = tF ≥ 200ns, CO=22µF (1) -5 +5 %VO
%VO/ΔIO
Short circuit removal
response
IO = 10mA to IO= short,
TA = 25°C (1) -10 +10 %VO
1. Guaranteed by design, but not tested in production.
ST1S12XX, ST1S12XX12, ST1S12XX18 Electrical characteristics
Doc ID 14314 Rev 5 7/20
VIN =VEN = 3 V, CIN = 4.7 µF, CO =10 µF, L = 2.2 µH, TJ = -40 to 125 °C (unless otherwise
specified. Typical values are referred to 25 °C).
Table 7. Electrical characteristics for ST1S12G12
Symbol Parameter Test conditions Min. Typ. Max. Unit
OUT Output feedback pin TJ =-40 to 125°C 1.164 1.2 1.236 V
IOVO pin bias current 15 20 µA
VIN Minimum input voltage IO= 10mA to 0.7A 2.5 V
IQQuiescent current VIN =VEN, VFB=1.5V 500 650 µA
VEN = 0, T = -40°C to 85°C 1 µA
IOOutput current VIN = 2.5V to 5.5V (1) 0.7 A
VEN Enable threshold Device ON, VIN = 2.5 to 5.5V 1.5 V
Device OFF 0.5
IEN Enable pin current 1 µA
%VO/ΔVIN Reference line regulation VIN = 2.5V to 5.5V (1) 0.05 0.1 %VO/ΔVIN
%VO/ΔIOReference load regulation IO = 10mA to 700mA (1) 0.0025 0.005 %VO/mA
PWMfSPWM switching frequency 1.16 1.7 2.08 MHz
RDSON-N NMOS switch on resistance ISW = 100 mA 0.25 0.4 Ω
RDSON-P PMOS switch on resistance ISW = 100 mA 0.25 0.45 Ω
ISWL Switching current limitation (1) 1.6 A
νEfficiency (1) IO = 10mA to 100mA 80 %
IO = 100mA to 0.7A 85
TSHDN Thermal shutdown 130 150 °C
THYS Thermal shutdown hysteresis 15 °C
%VO/ΔIOLoad transient response IO = 100mA to 700mA, TA = 25°C
tR = tF ≥ 200ns, CO=22µF (1) -5 +5 %VO
%VO/ΔIO
Short circuit removal
response
IO = 10mA to IO = short,
TA = 25°C (1) -10 +10 %VO
1. Guaranteed by design, but not tested in production.
Electrical characteristics ST1S12XX, ST1S12XX12, ST1S12XX18
8/20 Doc ID 14314 Rev 5
VIN =VEN = 3.6 V, CIN = 4.7 µF, CO =10 µF, L = 2.2 µH, TJ = -40 to 125 °C (unless otherwise
specified. Typical values are referred to 25 °C).
Table 8. Electrical characteristics for ST1S12G18
Symbol Parameter Test conditions Min. Typ. Max. Unit
OUT Output feedback pin TJ =-40 to 125°C 1.746 1.8 1.854 V
IOVO pin bias current 15 20 µA
VIN Minimum input voltage IO= 10mA to 0.7A 2.5 V
IQQuiescent current VIN =VEN, VFB=2V 500 650 µA
VEN = 0, TJ = -40°C to 85°C 1 µA
IOOutput current VIN = 2.5V to 5.5V (1) 0.7 A
VEN Enable threshold Device ON, VI = 2.5V to 5.5V 1.5 V
Device OFF 0.5
IEN Enable pin current 1 µA
%VO/ΔVIN Reference line regulation VIN = 2.5V to 5.5V (1) 0.05 0.1 %VO/ΔVIN
%VO/ΔIOReference load regulation IO = 10mA to 700mA (1) 0.0025 0.005 %VO/mA
PWMfSPWM switching frequency 1.16 1.7 2.08 MHz
RDSON-N NMOS switch on resistance ISW = 100mA 0.25 0.4 Ω
RDSON-P PMOS switch on resistance ISW = 100mA 0.25 0.45 Ω
ISWL Switching current limitation (1) 1.6 A
νEfficiency (1) IO = 10mA to 100mA 80 %
IO = 100mA to 0.7A 90
TSHDN Thermal shutdown 130 150 °C
THYS Thermal shutdown hysteresis 15 °C
%VO/ΔIOLoad transient response IO = 100mA to 700mA, TA = 25°C
tR = tF ≥ 200ns, CO=22µF (1) -5 +5 %VO
%VO/ΔIOShort circuit removal response IO = 10mA to IO = short,
TA = 25°C (1) -10 +10 %VO
1. Guaranteed by design, but not tested in production.
ST1S12XX, ST1S12XX12, ST1S12XX18 Typical application
Doc ID 14314 Rev 5 9/20
5 Typical application
Figure 3. Application circuit
Application notes ST1S12XX, ST1S12XX12, ST1S12XX18
10/20 Doc ID 14314 Rev 5
6 Application notes
The ST1S12 is an adjustable current mode PWM step-down DC-DC converter with internal
0.7 A power switch, packaged in TSOT23-5L. This device is a complete 0.7 A switching
regulator, with its internal compensation eliminating the need for additional components.
Because the ST1S12 an adjustable regulator, the output voltage is determined by an
external resistor divider. The desired value is derived by the following equation:
Equation 1
VO = VFB [1 + R1 / R2]
For the device to function only a few component are required: an inductor, two capacitors
and the resistor divider. The inductor selected must be capable of non saturation at peak
current level. Moreover, its value can be selected taking into account that a large inductor
value increases efficiency at low output current and reduces output voltage ripple, while a
smaller inductor can be used when it is important to reduce package size and the total cost
of the application. Finally, the ST1S12 has been designed to work properly with X5R or X7R
SMD ceramic capacitors both at the input and at the output. These types of capacitors, due
to their very low series resistance (ESR), minimize the output voltage ripple. Other low ESR
capacitors can be used according to the need of the application without compromising the
correct functioning of the device.
ST1S12XX, ST1S12XX12, ST1S12XX18 Typical performance characteristics
Doc ID 14314 Rev 5 11/20
7 Typical performance characteristics
Unless otherwise specified, refer to the typical application circuit under the following
conditions: CIN = 4.7 µF, COUT = 10 µF, L = 2.2 µH
Figure 4. Voltage feedback vs. temperature Figure 5. Drop vs. temperature
Figure 6. Oscillator frequency vs.
temperature
Figure 7. Efficiency vs. output current
Figure 8. Efficiency vs. output current Figure 9. Efficiency vs. temperature
550
570
590
610
630
650
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
V
FB
[mV]
V
IN
=V
EN
=3.6V, I
OUT
=10mA, V
OUT
=1.8V
550
570
590
610
630
650
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
V
FB
[mV]
V
IN
=V
EN
=3.6V, I
OUT
=10mA, V
OUT
=1.8V
0
0.1
0.2
0.3
0.4
0.5
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Drop [V]
I
OUT
=700mA
, V
OUT
=2.7V, Duty cycle=100%
0
0.1
0.2
0.3
0.4
0.5
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Drop [V]
I
OUT
=700mA
, V
OUT
=2.7V, Duty cycle=100%
1.1
1.3
1.5
1.7
1.9
2.1
2.3
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
PWM freq.[MHz]
V
IN
=V
EN
=3.6V, V
FB
=0.65V, V
OUT
=1.8V
1.1
1.3
1.5
1.7
1.9
2.1
2.3
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
PWM freq.[MHz]
V
IN
=V
EN
=3.6V, V
FB
=0.65V, V
OUT
=1.8V
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
I
OU
T
[A]
Efficiency [%]
V
IN
=V
EN
=3V, I
OUT
=from 10mA to 700mA, V
OUT
=1.2V
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
I
OU
T
[A]
Efficiency [%]
V
IN
=V
EN
=3V, I
OUT
=from 10mA to 700mA, V
OUT
=1.2V
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
I
OU
T
[A]
Efficiency [%]
V
IN
=V
EN
=3.6V, I
OUT
=from 10mA to 700mA, V
OUT
=1.8V
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
I
OU
T
[A]
Efficiency [%]
V
IN
=V
EN
=3.6V, I
OUT
=from 10mA to 700mA, V
OUT
=1.8V
0
10
20
30
40
50
60
70
80
90
100
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Efficiency [%]
I
OUT
=100mA
I
OUT
=700mA
V
IN
=V
EN
=3.6V, V
OUT
=1.8V
0
10
20
30
40
50
60
70
80
90
100
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Efficiency [%]
I
OUT
=100mA
I
OUT
=700mA
V
IN
=V
EN
=3.6V, V
OUT
=1.8V
Typical performance characteristics ST1S12XX, ST1S12XX12, ST1S12XX18
12/20 Doc ID 14314 Rev 5
Figure 10. Efficiency vs. temperature Figure 11. Supply current vs. temperature
Figure 12. Quiescent current vs. temperature Figure 13. Enable voltage vs. temperature
Figure 14. Enable voltage vs. temperature Figure 15. Reference line regulation vs.
temperature
I
OUT
=100mA
I
OUT
=700mA
0
10
20
30
40
50
60
70
80
90
100
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Efficiency [%]
V
IN
=V
EN
=3V, V
OUT
=1.2V
I
OUT
=100mA
I
OUT
=700mA
0
10
20
30
40
50
60
70
80
90
100
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Efficiency [%]
V
IN
=V
EN
=3V, V
OUT
=1.2V
1
2
3
4
5
6
7
8
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
I
SUPPLY
[mA]
V
IN
=V
EN
=3V, V
OUT
=1.2V, No Load
1
2
3
4
5
6
7
8
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
I
SUPPLY
[mA]
V
IN
=V
EN
=3V, V
OUT
=1.2V, No Load
350
370
390
410
430
450
470
490
510
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
I
SUPPLY
[µA]
V
IN
=V
EN
=3.6V, V
FB
=0.65V, C
IN
=C
OUT
=10µF, No Switching
350
370
390
410
430
450
470
490
510
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
I
SUPPLY
[µA]
V
IN
=V
EN
=3.6V, V
FB
=0.65V, C
IN
=C
OUT
=10µF, No Switching
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
V
EN
[V]
ON
OFF
V
IN
=2.5V, I
OUT
=10mA, C
IN
=C
OUT
=10µF, V
OUT
=1.8V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
V
EN
[V]
ON
OFF
V
IN
=2.5V, I
OUT
=10mA, C
IN
=C
OUT
=10µF, V
OUT
=1.8V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
VEN [V]
ON
OFF
VIN=5.5V, IOUT=10mA, CIN= COUT=10µF, VOUT=1.8V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
VEN [V]
ON
OFF
VIN=5.5V, IOUT=10mA, CIN= COUT=10µF, VOUT=1.8V
-0.6
-0.4
-0.2
-0
0.2
0.4
0.6
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
LINE [%V
OUT
/ΔV
IN
]
V
IN
=V
EN
= 2.5V to 5.5V, C
IN
=C
OUT
=10µF, I
OUT
=10mA, V
OUT
=1.8V
-0.6
-0.4
-0.2
-0
0.2
0.4
0.6
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
LINE [%V
OUT
/ΔV
IN
]
V
IN
=V
EN
= 2.5V to 5.5V, C
IN
=C
OUT
=10µF, I
OUT
=10mA, V
OUT
=1.8V
ST1S12XX, ST1S12XX12, ST1S12XX18 Typical performance characteristics
Doc ID 14314 Rev 5 13/20
Figure 16. Reference load regulation vs.
temperature
Figure 17. NMOS switch on resistance vs.
temperature
Figure 18. PMOS switch on resistance vs.
temperature
Figure 19. Switching current limitation vs.
temperature
Figure 20. Switching current limitation vs.
input voltage
Figure 21. Output voltage vs. input voltage
0
0.001
0.002
0.003
0.004
0.005
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
LOAD [%V
OUT
/mA]
V
IN
=3.6V, I
OUT
from 10mA to 0.7A, V
OUT
=1.8V
0
0.001
0.002
0.003
0.004
0.005
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
LOAD [%V
OUT
/mA]
V
IN
=3.6V, I
OUT
from 10mA to 0.7A, V
OUT
=1.8V
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
R
DSON
-N [ohm]
V
IN
=V
EN
=3.6V, C
IN
=C
OUT
=10µF, V
OUT
=1.2V
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
R
DSON
-N [ohm]
V
IN
=V
EN
=3.6V, C
IN
=C
OUT
=10µF, V
OUT
=1.2V
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
R
DSON
-P [ohm]
V
IN
=V
EN
=3.6V, C
IN
=C
OUT
=10µF, V
OUT
=1.2V
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
R
DSON
-P [ohm]
V
IN
=V
EN
=3.6V, C
IN
=C
OUT
=10µF, V
OUT
=1.2V
0.5
0.8
1.1
1.4
1.7
2
2.3
2.6
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
I
SW
[A]
V
IN
=V
EN
=3.6V, C
IN
=C
OUT
=10µF, V
OUT
=1.8V
0.5
0.8
1.1
1.4
1.7
2
2.3
2.6
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
I
SW
[A]
V
IN
=V
EN
=3.6V, C
IN
=C
OUT
=10µF, V
OUT
=1.8V
0
0.5
1
1.5
2
2.5
3
22.533.544.555.56
V
IN
[V]
I
SW
[A]
V
IN
=V
EN
from 2.5 to 5.5V, C
IN
=C
OUT
=10µF, V
OUT
=1.8V
0
0.5
1
1.5
2
2.5
3
22.533.544.555.56
V
IN
[V]
I
SW
[A]
V
IN
=V
EN
from 2.5 to 5.5V, C
IN
=C
OUT
=10µF, V
OUT
=1.8V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0123456
VIN [V]
VOUT [V]
125°C
25°C
0°C
-25°C
-40°C
V
IN
=V
EN
from 0 to 5.5V, I
OUT
=700mA,
C
IN
=C
OUT
=10µF
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0123456
VIN [V]
VOUT [V]
125°C
25°C
0°C
-25°C
-40°C
V
IN
=V
EN
from 0 to 5.5V, I
OUT
=700mA,
C
IN
=C
OUT
=10µF
Typical performance characteristics ST1S12XX, ST1S12XX12, ST1S12XX18
14/20 Doc ID 14314 Rev 5
Figure 22. Line transient Figure 23. Load transient
VIN = VEN from 4.5 V to 5.5 V, IOUT = 350 mA,
CIN = COUT = 10 µF, VOUT = 1.8 V
VIN = VEN = 3 V, IOUT = 100 mA to 700 mA, tR = tF = 200 ns
Figure 24. Start-up transient Figure 25. Enable transient
VIN = VEN from 0 V to 6 V, IOUT = 350 mA,
CIN = COUT = 10 µF, VOUT = 1.8 V
VIN = 3.6, VEN from 0 V to 2 V, IOUT = 350 mA,
CIN = COUT = 10 µF, VOUT = 1.8 V
VIN
VOUT
VOUT
IOUT
VIN
VOUT
VEN
VOUT
ST1S12XX, ST1S12XX12, ST1S12XX18 Package mechanical data
Doc ID 14314 Rev 5 15/20
8 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at:
www.st.com
.
ECOPACK® is an ST trademark.
Package mechanical data ST1S12XX, ST1S12XX12, ST1S12XX18
16/20 Doc ID 14314 Rev 5
Dim.
mm. mils.
Min. Typ. Max. Min. Typ. Max.
A1.143.3
A1 0 0.1 3.9
A2 0.7 1.0 27.6 39.4
b0.30.5 11.819.7
C0.080.2 3.1 7.9
D2.9114.2
E2.8110.2
E1 1.6 63.0
e0.9537.4
e1 1.974.8
L0.30.6 11.823.6
TSOT23-5L mechanical data
7282780B
ST1S12XX, ST1S12XX12, ST1S12XX18 Package mechanical data
Doc ID 14314 Rev 5 17/20
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A180 7.086
C 12.813.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T 14.4 0.567
Ao 3.133.233.33 0.1230.127 0.131
Bo 3.07 3.17 3.27 0.120 0.124 0.128
Ko 1.27 1.37 1.47 0.050 0.054 0.0.58
Po 3.94.0 4.1 0.1530.157 0.161
P3.94.0 4.1 0.1530.157 0.161
Tape & reel TSOT23-5L mechanical data
Package mechanical data ST1S12XX, ST1S12XX12, ST1S12XX18
18/20 Doc ID 14314 Rev 5
Figure 26. TSOT23-5L footprint recommended data
Table 9. Footprint data
Values
mm. inch.
A 3.50 0.138
B 1.10 0.043
C 0.60 0.024
D 0.95 0.037
E 1.20 0.047
F 2.30 0.090
ST1S12XX, ST1S12XX12, ST1S12XX18 Revision history
Doc ID 14314 Rev 5 19/20
9 Revision history
Table 10. Document revision history
Date Revision Changes
10-Jan-2008 1 Initial release.
01-Feb-2008 2 Modified:
Figure 3 on page 9
.
23-Feb-2010 3 Modified: VIN value
Table 3 on page 5
.
23-Jun-2011 4 Modified: FB unit
Table 6 on page 6
.
17-Feb-2012 5 Modified: quiescent current max value 600 ==> 650
Table 6 on page 6
,
Table 7 on page 7
and
Table 8 on page 8
.
ST1S12XX, ST1S12XX12, ST1S12XX18
20/20 Doc ID 14314 Rev 5
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