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PDF ST1S12G18R Data sheet ( Hoja de datos )
| Número de pieza | ST1S12G18R | |
| Descripción | Synchronous rectification | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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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
TSOT23-5L
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.
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
Table 1. Device summary
Part numbers
Order codes
ST1S12XX
ST1S12XX12
ST1S12XX18
ST1S12GR
ST1S12G12R
ST1S12G18R
Package
TSOT23-5L
TSOT23-5L
TSOT23-5L
February 2012
Doc ID 14314 Rev 5
1/20
www.st.com
20
1 page  
ST1S12XX, ST1S12XX12, ST1S12XX18
3 Maximum ratings
Maximum ratings
Table 3. Absolute maximum ratings
Symbol
Parameter
VIN
VEN
SWITCH Voltage
Positive power supply voltage
Enable voltage
Max. voltage of output pin
VFB/VO
VO
TJ
TSTG
TLEAD
Feedback voltage
Output voltage (for VO > 1.6 V)
Max junction temperature
Storage temperature range
Lead temperature (soldering) 10 sec
Value
-0.3 to 6.5
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-0.3 to 3
-0.3 to 6
-40 to 150
-65 to 150
260
Unit
V
V
V
V
V
°C
°C
°C
Note:
Absolute maximum ratings are the values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 4. Thermal data
Symbol
Parameter
RthJA
RthJC
Thermal resistance junction-ambient
Thermal resistance junction-case
Value
220
110
Unit
°C/W
°C/W
Table 5. ESD performance
Symbol
Parameter
ESD ESD protection voltage
Test conditions
HBM
MM
Value
2
0.3
Unit
kV
kV
Doc ID 14314 Rev 5
5/20
5 Page 
ST1S12XX, ST1S12XX12, ST1S12XX18
Typical performance characteristics
7 Typical performance characteristics
Figure 4.
Unless otherwise specified, refer to the typical application circuit under the following
conditions: CIN = 4.7 µF, COUT = 10 µF, L = 2.2 µH
Voltage feedback vs. temperature Figure 5. Drop vs. temperature
650
630
VIN=VEN=3.6V, IOUT=10mA, VOUT=1.8V
610
590
570
550
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
0.5
IOUT=700mA, VOUT=2.7V, Duty cycle=100%
0.4
0.3
0.2
0.1
0
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Figure 6. Oscillator frequency vs.
temperature
Figure 7. Efficiency vs. output current
2.3
VIN=VEN=3.6V, VFB=0.65V, VOUT=1.8V
2.1
1.9
1.7
1.5
1.3
1.1
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
100
90
80
70
60
50
40
30
20
10
0
0
VIN=VEN=3V, IOUT=from 10mA to 700mA, VOUT=1.2V
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
IOUT [A]
Figure 8. Efficiency vs. output current
Figure 9. Efficiency vs. temperature
100
90
80
70
60
50
40
30
20
10
0
0
VIN=VEN=3.6V, IOUT=from 10mA to 700mA, VOUT=1.8V
0.1 0.2 0.3 0.4 0.5 0.6 0.7
IOUT [A]
100
90
80
70
60
50
40
30
20
10
0
IOUT=100mA
IOUT=700mA
VIN=VEN=3.6V, VOUT=1.8V
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Doc ID 14314 Rev 5
11/20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ST1S12G18R.PDF ] | |
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