STMICROELECTRONICS ST1S12GR

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) DCDC 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 600 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
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 ST1S12Gxx is
available in the TSOT23-5L package.
Description
The ST1S12Gxx 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
Table 1.
Device summary
Part numbers
Order codes
Package
ST1S12XX
ST1S12GR
TSOT23-5L
ST1S12XX12
ST1S12G12R
TSOT23-5L
ST1S12XX18
ST1S12G18R
TSOT23-5L
February 2010
Doc ID 14314 Rev 3
1/20
www.st.com
20
Contents
ST1S12XX, ST1S12XX12, ST1S12XX18
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
2/20
Doc ID 14314 Rev 3
ST1S12XX, ST1S12XX12, ST1S12XX18
1
Schematic
Figure 1.
Schematic diagram
Schematic
VIN
UVLO
+
I_SEN
Rsense
-
Σ
VSUM
Comp
VRST
VSET
MOSFET
CONTROL
LOGIC
VDRV_P
Driver
OSC
SW
VC
+
DMD
DMD
-
gm
+
-
SHUT DOWN
VDRV_N
Driver
SOFT START
REF1
FB/VO
EN
Doc ID 14314 Rev 3
Gnd
3/20
Pin configuration
ST1S12XX, ST1S12XX12, ST1S12XX18
2
Pin configuration
Figure 2.
Pin connections (top view)
Table 2.
Pin description
Pin n°
Symbol
1
EN
2
GND
3
SW
Switching pin
4
VIN
Input supply pin
5
FB/VO
4/20
Name and function
Enable pin
System ground
Feedback voltage / or output voltage
Doc ID 14314 Rev 3
ST1S12XX, ST1S12XX12, ST1S12XX18
3
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Maximum ratings
Parameter
Value
Unit
-0.3 to 6.5
V
VIN
Positive power supply voltage
VEN
Enable voltage
-0.3 to VIN + 0.3
V
Max. voltage of output pin
-0.3 to VIN + 0.3
V
Feedback voltage
-0.3 to 3
V
VO
Output voltage (for VO > 1.6 V)
-0.3 to 6
V
TJ
Max junction temperature
-40 to 150
°C
TSTG
Storage temperature range
-65 to 150
°C
TLEAD
Lead temperature (soldering) 10 sec
260
°C
SWITCH Voltage
VFB/VO
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
Value
Unit
RthJA
Thermal resistance junction-ambient
220
°C/W
RthJC
Thermal resistance junction-case
110
°C/W
Table 5.
Symbol
ESD
ESD performance
Parameter
Test conditions
Value
Unit
HBM
2
kV
MM
0.3
kV
ESD protection voltage
Doc ID 14314 Rev 3
5/20
Electrical characteristics
4
ST1S12XX, ST1S12XX12, ST1S12XX18
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.
Symbol
Electrical characteristics for ST1S12G
Parameter
FB
Feedback voltage
IFB
VFB pin bias current
VIN
Minimum input voltage
IQ
Quiescent current
IO
Output current
Enable threshold
IEN
Enable pin current
%VO/ΔIO
Reference load regulation
PWMfS
PWM switching frequency
RDSON-P PMOS switch on resistance
TSHDN
THYS
Max.
Unit
582
600
618
V
50
nA
-50
IO = 10mA to 0.7A
2.5
VIN = VEN, VFB = 0.65V
V
500
VIN = 2.5V to 5.5 V (1)
0.7
Device ON, VIN = 2.5V to 5.5V
1.5
Switching current limitation
Efficiency (1)
µA
1
µA
V
0.5
VIN = 2.5V to 5.5V (1)
IO = 10 mA to 700mA
600
A
0.05
(1)
1
µA
0.1
%VO/ΔVIN
0.0025 0.005
1.16
1.7
Maximum duty cycle
RDSON-N NMOS switch on resistance
ν
Typ.
Device OFF
%VO/ΔVIN Reference line regulation
ISWL
TJ = -40 to 125°C
Min.
VEN = 0, TJ = -40°C to 85°C
VEN
DMAX
Test conditions
%VO/mA
2.08
MHz
100
%
ISW = 100mA
0.25
0.4
Ω
ISW = 100mA
0.25
0.45
Ω
(1)
1.6
IO = 10mA to 100 mA, VO = 1.8V
80
IO = 100mA to 0.7A, VO = 1.8V
90
Thermal shutdown
A
%
130
Thermal shutdown hysteresis
150
°C
15
°C
%VO/ΔIO
Load 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.
6/20
Doc ID 14314 Rev 3
ST1S12XX, ST1S12XX12, ST1S12XX18
Electrical characteristics
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.
Symbol
Electrical characteristics for ST1S12G12
Parameter
OUT
Output feedback pin
IO
VO pin bias current
VIN
Minimum input voltage
IQ
Quiescent current
IO
Output current
Enable threshold
IEN
Enable pin current
%VO/ΔIO
Reference load regulation
PWMfS
PWM switching frequency
RDSON-N NMOS switch on resistance
RDSON-P PMOS switch on resistance
TSHDN
THYS
IO= 10mA to 0.7A
Typ.
Max.
Unit
1.164
1.2
1.236
V
15
20
µA
2.5
VIN =VEN, VFB=1.5V
V
500
VIN = 2.5V to 5.5V (1)
0.7
Device ON, VIN = 2.5 to 5.5V
1.5
Switching current limitation
Efficiency (1)
µA
1
µA
V
0.5
VIN = 2.5V to 5.5V (1)
IO = 10mA to 700mA
600
A
Device OFF
%VO/ΔVIN Reference line regulation
ν
TJ =-40 to 125°C
Min.
VEN = 0, T = -40°C to 85°C
VEN
ISWL
Test conditions
0.05
(1)
1
µA
0.1
%VO/ΔVIN
0.0025 0.005
1.16
%VO/mA
1.7
2.08
MHz
ISW = 100 mA
0.25
0.4
Ω
ISW = 100 mA
0.25
0.45
Ω
(1)
1.6
IO = 10mA to 100mA
80
IO = 100mA to 0.7A
85
Thermal shutdown
A
%
130
Thermal shutdown hysteresis
150
°C
15
°C
%VO/ΔIO
Load 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.
Doc ID 14314 Rev 3
7/20
Electrical characteristics
ST1S12XX, ST1S12XX12, ST1S12XX18
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.
Symbol
Electrical characteristics for ST1S12G18
Parameter
OUT
Output feedback pin
IO
VO pin bias current
VIN
Minimum input voltage
IQ
Quiescent current
IO
Output current
Enable threshold
IEN
Enable pin current
%VO/ΔIO
Reference load regulation
PWMfS
PWM switching frequency
RDSON-N NMOS switch on resistance
RDSON-P PMOS switch on resistance
TSHDN
THYS
IO= 10mA to 0.7A
Typ.
Max.
Unit
1.746
1.8
1.854
V
15
20
µA
2.5
VIN =VEN, VFB=2V
V
500
VIN = 2.5V to 5.5V (1)
0.7
Device ON, VI = 2.5V to 5.5V
1.5
Switching current limitation
Efficiency (1)
µA
1
µA
V
0.5
VIN = 2.5V to 5.5V (1)
IO = 10mA to 700mA
600
A
Device OFF
%VO/ΔVIN Reference line regulation
ν
TJ =-40 to 125°C
Min.
VEN = 0, TJ = -40°C to 85°C
VEN
ISWL
Test conditions
0.05
(1)
1
µA
0.1
%VO/ΔVIN
0.0025 0.005
1.16
%VO/mA
1.7
2.08
MHz
ISW = 100mA
0.25
0.4
Ω
ISW = 100mA
0.25
0.45
Ω
(1)
1.6
IO = 10mA to 100mA
80
IO = 100mA to 0.7A
90
Thermal shutdown
A
%
130
Thermal shutdown hysteresis
150
°C
15
°C
%VO/ΔIO
Load 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.
8/20
Doc ID 14314 Rev 3
ST1S12XX, ST1S12XX12, ST1S12XX18
Typical application
5
Typical application
Figure 3.
Application circuit
Doc ID 14314 Rev 3
9/20
Application notes
6
ST1S12XX, ST1S12XX12, ST1S12XX18
Application notes
The ST1S12Gxx 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 ST1S12Gxx 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 ST1S12Gxx 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.
10/20
Doc ID 14314 Rev 3
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
0.5
VIN=VEN=3.6V, IOUT=10mA, VOUT=1.8V
IOUT=700mA, VOUT=2.7V, Duty cycle=100%
0.4
Drop [V]
VFB [mV]
630
610
590
0.3
0.2
0.1
570
0
550
-75
-50
-25
0
25
50
75
100
125
150
-75
175
-50
-25
0
25
Figure 6.
Oscillator frequency vs.
temperature
Figure 7.
VIN=VEN=3.6V, VFB=0.65V, VOUT=1.8V
Efficiency [%]
PWM freq.[MHz]
2.3
2.1
1.9
1.7
1.5
1.3
1.1
-75
-50
-25
0
25
50
75
100
90
80
70
60
50
40
30
20
10
0
100 125 150 175
0.1
Figure 9.
VIN=VEN=3.6V, IOUT=from 10mA to 700mA, VOUT=1.8V
0
0.1
0.2
0.3
100
125
150
175
VIN=VEN=3V, IOUT=from 10mA to 700mA, VOUT=1.2V
0
Efficiency [%]
Efficiency [%]
Efficiency vs. output current
100
90
80
70
60
50
40
30
20
10
0
75
Efficiency vs. output current
0.2
0.3
T [°C]
Figure 8.
50
T [°C]
T [°C]
0.4
IOUT [A]
0.5
0.6
0.7
0.4
IOUT [A]
0.5
0.6
0.7
0.8
Efficiency vs. temperature
100
90
80
70
60
50
40
30
20
10
0
IOUT=100mA
IOUT=700mA
VIN=VEN=3.6V, VOUT=1.8V
-75
Doc ID 14314 Rev 3
-50
-25
0
25
50
75
100 125 150 175
T [°C]
11/20
Typical performance characteristics
ST1S12XX, ST1S12XX12, ST1S12XX18
100
90
80
70
60
50
40
30
20
10
0
Figure 11. Supply current vs. temperature
8
IOUT=100mA
VIN=VEN=3V, VOUT=1.2V, No Load
7
ISUPPLY [mA]
Efficiency [%]
Figure 10. Efficiency vs. temperature
IOUT=700mA
6
5
4
3
2
VIN=VEN=3V, VOUT=1.2V
-75
-50
-25
0
25
1
50
75
100
125
150
-75
175
-50
-25
0
25
VIN=VEN=3.6V, VFB=0.65V, CIN=COUT=10µF, No Switching
-75
-50
-25
0
25
50
75
100
125
150
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
125
150
175
VIN=2.5V, IOUT=10mA, CIN=COUT=10µF, VOUT=1.8V
-75
175
-50
-25
0
25
50
75
100
125
150
175
T [°C]
Figure 14. Enable voltage vs. temperature
Figure 15. Reference line regulation vs.
temperature
0.6
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
ON
OFF
LINE [%VOUT/ΔVIN]
VEN [V]
100
ON
OFF
T [°C]
VIN=5.5V, IOUT=10mA, CIN= COUT=10µF, VOUT=1.8V
VIN=VEN= 2.5V to 5.5V, CIN=COUT=10µF, IOUT=10mA, VOUT=1.8V
0.4
0.2
-0
-0.2
-0.4
-0.6
-75
-50
-25
0
25
50
75
100
125
150
175
-75
-50
-25
0
25
50
T [°C]
T [°C]
12/20
75
Figure 13. Enable voltage vs. temperature
VEN [V]
ISUPPLY [µA]
Figure 12. Quiescent current vs. temperature
510
490
470
450
430
410
390
370
350
50
T [°C]
T [°C]
Doc ID 14314 Rev 3
75
100
125
150
175
ST1S12XX, ST1S12XX12, ST1S12XX18
Typical performance characteristics
Figure 16. Reference load regulation vs.
temperature
Figure 17. NMOS switch on resistance vs.
temperature
0.7
VIN=3.6V, IOUT from 10mA to 0.7A, VOUT=1.8V
VIN=VEN=3.6V, CIN=COUT=10µF, VOUT=1.2V
0.6
0.004
RDSON-N [ohm]
LOAD [%VOUT/mA]
0.005
0.003
0.002
0.001
0.5
0.4
0.3
0.2
0.1
0
0
-75
-50
-25
0
25
50
75
100
125
150
-75
175
-50
-25
0
25
T [°C]
Figure 18. PMOS switch on resistance vs.
temperature
0.7
125
150
175
2.3
0.5
2
ISW [A]
RDSON-P [ohm]
100
2.6
0.4
0.3
1.7
1.4
0.2
1.1
0.1
0.8
VIN=VEN=3.6V, CIN=COUT=10µF, VOUT=1.8V
0.5
0
-75
-50
-25
0
25
50
75
100
125
150
-75
175
-50
-25
0
25
Figure 20. Switching current limitation vs.
input voltage
VIN=VEN from 2.5 to 5.5V, CIN=COUT=10µF, VOUT=1.8V
VOUT [V]
2
1.5
1
0.5
0
2
2.5
3
3.5
4
75
100
125
150
175
Figure 21. Output voltage vs. input voltage
3
2.5
50
T [°C]
T [°C]
ISW [A]
75
Figure 19. Switching current limitation vs.
temperature
VIN=VEN=3.6V, CIN=COUT=10µF, VOUT=1.2V
0.6
50
T [°C]
4.5
5
5.5
6
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
125°C
25°C
0°C
-25°C
-40°C
VIN=VEN from 0 to 5.5V, IOUT=700mA,
CIN=COUT=10µF
0
VIN [V]
1
2
3
4
5
6
VIN [V]
Doc ID 14314 Rev 3
13/20
Typical performance characteristics
ST1S12XX, ST1S12XX12, ST1S12XX18
Figure 22. Line transient
Figure 23. Load transient
VOUT
VIN
IOUT
VOUT
VIN = VEN from 4.5 V to 5.5 V, IOUT = 350 mA, CIN = COUT =
10µF, 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
VEN
VIN
VOUT
VIN = VEN from 0 V to 6 V, IOUT = 350 mA, CIN = COUT =
10µF, VOUT = 1.8 V
14/20
VOUT
VIN =3.6, VEN from 0 V to 2 V, IOUT = 350 mA, CIN = COUT =
10µF, VOUT = 1.8 V
Doc ID 14314 Rev 3
ST1S12XX, ST1S12XX12, ST1S12XX18
8
Package mechanical data
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.
Doc ID 14314 Rev 3
15/20
Package mechanical data
ST1S12XX, ST1S12XX12, ST1S12XX18
TSOT23-5L mechanical data
mm.
mils.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
Max.
1.1
43.3
3.9
A1
0
0.1
A2
0.7
1.0
27.6
39.4
b
0.3
0.5
11.8
19.7
C
0.08
0.2
3.1
7.9
D
2.9
114.2
E
2.8
110.2
E1
1.6
63.0
e
0.95
37.4
e1
1.9
74.8
L
0.3
0.6
11.8
23.6
7282780B
16/20
Doc ID 14314 Rev 3
ST1S12XX, ST1S12XX12, ST1S12XX18
Package mechanical data
Tape & reel TSOT23-5L mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
180
13.0
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Max.
0.504
0.512
14.4
0.519
0.567
Ao
3.13
3.23
3.33
0.123
0.127
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
3.9
4.0
4.1
0.153
0.157
0.161
P
3.9
4.0
4.1
0.153
0.157
0.161
Doc ID 14314 Rev 3
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Package mechanical data
ST1S12XX, ST1S12XX12, ST1S12XX18
Figure 26. TSOT23-5L footprint recommended data
Table 9.
Footprint data
Values
18/20
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
Doc ID 14314 Rev 3
ST1S12XX, ST1S12XX12, ST1S12XX18
9
Revision history
Table 10.
Document revision history
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 valueTable 3 on page 5.
Doc ID 14314 Rev 3
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ST1S12XX, ST1S12XX12, ST1S12XX18
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