ST1S12GR [STMICROELECTRONICS]
Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L; 同步整流实现， 0.7 A ， 1.7 MHz的固定或可调降压型开关稳压器在TSOT23-5L
| 型号： | ST1S12GR |
| 厂家： | 
ST |
| 描述： | Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L |
| 文件： | 总20页 (文件大小：339K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ST1S12xx
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)
TSOT23-5L
■ Enable function
■ Internal soft start
■ Typical efficiency: > 90%
■ 0.7 A output current capability
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.
■ Not switching quiescent current: max 600 µA
over temperature range
■ R
typ. 250 mΩ and 400 mΩ
DSON
■ Uses tiny capacitors and inductors
■ Operative junction temp. -40°C to 125°C
■ Available in 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
ST1S12XX12
ST1S12XX18
ST1S12GR
ST1S12G12R
ST1S12G18R (1)
TSOT23-5L
TSOT23-5L
TSOT23-5L
1. Available on request.
February 2008
Rev 2
1/20
www.st.com
20
Contents
ST1S12xx
Contents
1
2
3
4
5
6
7
8
9
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
ST1S12xx
Schematic
1
Schematic
Figure 1. Schematic diagram
VIN
UVLO
+
I_SEN
R
sense
-
V
SUM
Σ
V
RST
Comp
MOSFET
CONTROL
LOGIC
VDRV_P
Driver
V
SET
SW
OSC
V
C
+
DMD
DMD
-
SHUT DOWN
V
DRV_N
Driver
SOFT START
REF1
EN
Gnd
FB/VO
3/20
Pin configuration
ST1S12xx
2
Pin configuration
Figure 2.
Pin connections (top view)
Table 2.
Pin n°
Pin description
Symbol
Name and function
1
2
3
4
5
EN
GND
SW
Enable pin
System ground
Switching pin
Input supply pin
VIN
FB/VO
Feedback voltage / or output voltage
4/20
ST1S12xx
3
Maximum ratings
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
VIN
Positive power supply voltage
Enable voltage
-0.3 to 7
V
VEN
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-0.3 to 3
V
V
SWITCH Voltage Max. voltage of output pin
VFB/VO
VO
Feedback voltage
V
Output voltage (for VO > 1.6V)
Max junction temperature
Storage temperature range
Lead temperature (soldering) 10 sec
-0.3 to 6
V
TJ
-40 to 150
-65 to 150
260
°C
°C
°C
TSTG
TLEAD
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.
Symbol
Thermal data
Parameter
Value
Unit
RthJA
RthJC
Thermal resistance junction-ambient
Thermal resistance junction-case
220
110
°C/W
°C/W
Table 5.
ESD performance
Parameter
Symbol
Test conditions
HBM
MM
Value
Unit
2
kV
kV
ESD
ESD protection voltage
0.3
5/20
Electrical characteristics
ST1S12xx
4
Electrical characteristics
Table 6.
Electrical characteristics for ST1S12G
=V = 3.6 V, C = 4.7 µF, C =10 µF, L = 2.2 µH, T = -40 to 125 °C (unless otherwise
V
IN
EN
IN
O
J
specified. Typical values are referred to 25 °C)
Parameter Test conditions
Feedback voltage TJ =-40 to 125°C
Symbol
Min.
Typ. Max.
Unit
FB
IFB
VIN
582
-50
2.5
600
500
618
50
V
nA
V
VFB pin bias current
Minimum input voltage
IO= 10mA to 0.7A
IN =VEN, VFB=0.65V
V
600
1
µA
µA
A
IQ
IO
VEN
IEN
Quiescent current
Output current
VEN = 0, T = -40°C to 85°C
VIN = 2.5 to 5.5V Note 1
Device ON, VIN = 2.5 to 5.5V
Device OFF
0.7
1.5
Enable threshold
Enable pin current
V
0.5
1
µA
%VO/ΔVIN Reference line regulation
%VO/ΔIO Reference load regulation
PWMfS PWM switching frequency
VIN = 2.5V to 5.5V Note 1
IO = 10mA to 700mA Note 1
0.05
0.1 %VO/ΔVIN
0.0025 0.005 %VO/mA
1.16
1.7
2.08
100
0.4
MHz
%
DMAX
Maximum duty cycle
RDSON-N NMOS switch on resistance
RDSON-P PMOS switch on resistance
ISW = 100 mA
ISW = 100 mA
Note 1
0.25
0.25
1.6
80
Ω
0.45
Ω
ISWL
Switching current limitation
A
IO = 10mA to 100mA, VO = 1.8V
IO = 100mA to 0.7A, VO = 1.8V
ν
Efficiency Note 1
%
90
TSHDN
THYS
Thermal shutdown
130
150
15
°C
°C
Thermal shutdown hysteresis
IO = 100mA to 700mA, TA = 25°C
tR = tF ≥ 200ns, CO=22µF Note 1
%VO/ΔIO Load transient response
-5
+5
%VO
%VO
Short circuit removal
%VO/ΔIO
IO = 10mA to IO=short, TA = 25°C
Note 1
-10
+10
response
Note:
1
Guaranteed by design, but not tested in production.
6/20
ST1S12xx
Electrical characteristics
Table 7.
Symbol
Electrical characteristics for ST1S12G12
=V = 3 V, C = 4.7 µF, C =10 µF, L = 2.2 µH, T = -40 to 125 °C (unless otherwise
specified. Typical values are referred to 25 °C)
V
IN
EN
IN
O
J
Parameter
Test conditions
TJ =-40 to 125°C
Min.
Typ. Max.
Unit
OUT
IO
Output feedback pin
VO pin bias current
Minimum input voltage
1.164
1.2
15
1.236
20
V
µA
V
VIN
IO= 10mA to 0.7A
2.5
V
IN =VEN, VFB=1.5V
500
600
1
µA
µA
A
IQ
IO
VEN
IEN
Quiescent current
Output current
VEN = 0, T = -40°C to 85°C
VIN = 2.5 to 5.5V Note 1
Device ON, VIN = 2.5 to 5.5V
Device OFF
0.7
1.5
Enable threshold
Enable pin current
V
0.5
1
µA
%VO/ΔVIN Reference line regulation
%VO/ΔIO Reference load regulation
PWMfS PWM switching frequency
RDSON-N NMOS switch on resistance
VIN = 2.5V to 5.5V Note 1
IO = 10mA to 700mA Note 1
0.05
0.1 %VO/ΔVIN
0.0025 0.005 %VO/mA
1.16
1.7
0.25
0.25
1.6
80
2.08
0.4
MHz
Ω
ISW = 100 mA
ISW = 100 mA
Note 1
RDSON-P PMOS switch on resistance
0.45
Ω
ISWL
Switching current limitation
A
IO = 10mA to 100mA
IO = 100mA to 0.7A
ν
Efficiency Note 1
%
85
TSHDN
THYS
Thermal shutdown
130
150
15
°C
°C
Thermal shutdown hysteresis
IO = 100mA to 700mA, TA = 25°C
tR = tF ≥ 200ns, CO=22µF Note 1
%VO/ΔIO Load transient response
-5
+5
%VO
%VO
Short circuit removal
%VO/ΔIO
IO = 10mA to IO=short, TA = 25°C
Note 1
-10
+10
response
Note:
1
Guaranteed by design, but not tested in production.
7/20
Electrical characteristics
ST1S12xx
Table 8.
Symbol
Electrical characteristics for ST1S12G18
=V = 3.6 V, C = 4.7 µF, C =10 µF, L = 2.2 µH, T = -40 to 125 °C (unless otherwise
specified. Typical values are referred to 25 °C)
V
IN
EN
IN
O
J
Parameter
Test conditions
Min.
Typ. Max.
Unit
OUT
IO
Output feedback pin
VO pin bias current
Minimum input voltage
TJ =-40 to 125°C
1.746
1.8
15
1.854
20
V
µA
V
VIN
IO= 10mA to 0.7A
2.5
V
IN =VEN, VFB=2V
500
600
1
µA
µA
A
IQ
IO
VEN
IEN
Quiescent current
Output current
VEN = 0, T = -40°C to 85°C
VIN = 2.5 to 5.5V Note 1
Device ON, VI = 2.5 to 5.5V
Device OFF
0.7
1.5
Enable threshold
Enable pin current
V
0.5
1
µA
%VO/ΔVIN Reference line regulation
%VO/ΔIO Reference load regulation
PWMfS PWM switching frequency
RDSON-N NMOS switch on resistance
VIN = 2.5V to 5.5V Note 1
IO = 10mA to 700mA Note 1
0.05
0.1 %VO/ΔVIN
0.0025 0.005 %VO/mA
1.16
1.7
0.25
0.25
1.6
80
2.08
0.4
MHz
Ω
ISW = 100 mA
ISW = 100 mA
Note 1
RDSON-P PMOS switch on resistance
0.45
Ω
ISWL
Switching current limitation
A
IO = 10mA to 100mA
IO = 100mA to 0.7A
ν
Efficiency Note 1
%
90
TSHDN
THYS
Thermal shutdown
130
150
15
°C
°C
Thermal shutdown hysteresis
IO = 100mA to 700mA, TA = 25°C
tR = tF ≥ 200ns, CO=22µF Note 1
%VO/ΔIO Load transient response
-5
+5
%VO
%VO
IO = 10mA to IO=short, TA = 25°C
Note 1
%VO/ΔIO Short circuit removal response
-10
+10
Note:
1
Guaranteed by design, but not tested in production.
8/20
ST1S12xx
Typical application
5
Typical application
Figure 3.
Application circuit
9/20
Application notes
ST1S12xx
6
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:
V = V [1+R /R ]
O
FB
1
2
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
ST1S12xx
Typical performance characteristics
7
Typical performance characteristics
Unless otherwise specified, refer to the typical application circuit under the following
conditions: C = 4.7 µF, C = 10 µF, L = 2.2 µH
IN
OUT
Figure 4.
Voltage feedback vs temperature
Figure 5.
Drop vs temperature
650
630
610
590
570
550
0.5
0.4
0.3
0.2
0.1
VIN=VEN=3.6V, IOUT=10mA, VOUT=1.8V
IOUT=700mA, VOUT=2.7V, Duty cycle=100%
0
-75
-50
-25
0
25
50
75
100 125 150 175
-75 -50 -25
0
25
50
75 100 125 150 175
T [°C]
T [°C]
Figure 6.
Oscillator frequency vs
temperature
Figure 7.
Efficiency vs output current
2.3
2.1
1.9
1.7
1.5
1.3
1.1
100
90
80
70
60
50
40
30
20
10
0
VIN=VEN=3.6V, VFB=0.65V, VOUT=1.8V
VIN=VEN=3V, IOUT=from 10mA to 700mA, VOUT=1.2V
-75 -50 -25
0
25 50 75 100 125 150 175
T [°C]
0
0.1
0.2
0.3
0.4
OUT [A]
0.5
0.6
0.7
0.8
I
Figure 8.
Efficiency vs output current
Figure 9.
Efficiency vs temperature
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
IOUT=100mA
IOUT=700mA
VIN=VEN=3.6V, VOUT=1.8V
VIN=VEN=3.6V, IOUT=from 10mA to 700mA, VOUT=1.8V
-75 -50 -25
0
25 50 75 100 125 150 175
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
T [°C]
IOUT [A]
11/20
Typical performance characteristics
Figure 10. Efficiency vs temperature
ST1S12xx
Figure 11. Supply current vs temperature
8
7
6
5
4
3
2
1
100
IOUT=100mA
VIN=VEN=3V, VOUT=1.2V, No Load
90
80
70
60
50
40
30
20
10
0
IOUT=700mA
VIN=VEN=3V, VOUT=1.2V
-75
-50
-25
0
25
50
75
100 125 150 175
-75 -50 -25
0
25
50
75 100 125 150 175
T [°C]
T [°C]
Figure 12. Quiescent current vs temperature Figure 13. Enable voltage vs temperature
510
490
470
450
430
410
390
370
350
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
ON
OFF
VIN=VEN=3.6V, VFB=0.65V, CIN=COUT=10µF, No Switching
VIN=2.5V, IOUT=10mA, CIN=COUT=10µF, VOUT=1.8V
-75 -50 -25
0
25
50
75
100 125 150 175
-75 -50 -25
0
25
50
75 100 125 150 175
T [°C]
T [°C]
Figure 14. Enable voltage vs temperature
Figure 15. Reference line regulation vs
temperature
1.8
0.6
VIN=VEN= 2.5V to 5.5V, CIN=COUT=10µF, IOUT=10mA, VOUT=1.8V
0.4
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
ON
OFF
0.2
-0
-0.2
-0.4
-0.6
VIN=5.5V, IOUT=10mA, CIN= COUT=10µF, VOUT=1.8V
-75
-50 -25
0
25
50
75
100 125 150 175
-75 -50 -25
0
25
50
75
100 125 150 175
T [°C]
T [°C]
12/20
ST1S12xx
Typical performance characteristics
Figure 16. Reference load regulation vs
temperature
Figure 17. NMOS switch on resistance vs
temperature
0.005
0.7
VIN=VEN=3.6V, CIN=COUT=10µF, VOUT=1.2V
VIN=3.6V, IOUT from 10mA to 0.7A, VOUT=1.8V
0.6
0.5
0.4
0.3
0.2
0.1
0
0.004
0.003
0.002
0.001
0
-75 -50 -25
0
25
50
75
100 125 150 175
-75 -50 -25
0
25
50
75 100 125 150 175
T [°C]
T [°C]
Figure 18. PMOS switch on resistance vs
temperature
Figure 19. Switching current limitation vs
temperature
0.7
2.6
2.3
2
VIN=VEN=3.6V, CIN=COUT=10µF, VOUT=1.2V
0.6
0.5
0.4
0.3
0.2
0.1
0
1.7
1.4
1.1
0.8
VIN=VEN=3.6V, CIN=COUT=10µF, VOUT=1.8V
0.5
-75 -50 -25
0
25
50
75
100 125 150 175
-75 -50 -25
0
25
50
75
100 125 150 175
T [°C]
T [°C]
Figure 20. Switching current limitation vs
input voltage
Figure 21. Output voltage vs input voltage
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
3
VIN=VEN from 2.5 to 5.5V, CIN=COUT=10µF, VOUT=1.8V
2.5
125°C
2
1.5
1
25°C
0°C
-25°C
-40°C
VIN=VEN from 0 to 5.5V, IOUT=700mA,
CIN=COUT=10µF
0.5
0
2
2.5
3
3.5
4
4.5
5
5.5
6
0
1
2
3
4
5
6
VIN [V]
VIN [V]
13/20
Typical performance characteristics
Figure 22. Line transient
ST1S12xx
Figure 23. Load transient
VOUT
VIN
IOUT
VOUT
VIN = VEN = 3 V, IOUT = 100 mA to 700 mA, tR = tF = 200 ns
VIN = VEN from 4.5 V to 5.5 V, IOUT = 350 mA, CIN = COUT
10µF, VOUT = 1.8 V
=
Figure 24. Start-up transient
Figure 25. Enable transient
VEN
VIN
VOUT
VOUT
VIN = VEN from 0 V to 6 V, IOUT = 350 mA, CIN = COUT
10µF, VOUT = 1.8 V
=
VIN =3.6, VEN from 0 V to 2 V, IOUT = 350 mA, CIN = COUT
10µF, VOUT = 1.8 V
=
14/20
ST1S12xx
Package mechanical data
8
Package mechanical data
®
In order to meet environmental requirements, ST offers these devices in ECOPACK
packages. These packages have a lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
15/20
Package mechanical data
ST1S12xx
TSOT23-5L mechanical data
mm.
mils.
Dim.
Min.
Typ.
Max.
1.1
0.1
Min.
Typ.
Max.
43.3
3.9
A
A1
A2
b
0
0.7
0.3
0.08
1.0
0.5
0.2
27.6
11.8
3.1
39.4
19.7
7.9
C
D
2.9
2.8
114.2
110.2
63.0
E
E1
e
1.6
0.95
1.9
37.4
e1
L
74.8
0.3
0.6
11.8
23.6
7282780B
16/20
ST1S12xx
Package mechanical data
Tape & reel TSOT23-5L mechanical data
mm.
Typ.
inch.
Typ.
Dim.
Min.
Max.
180
Min.
Max.
7.086
0.519
A
C
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
D
N
T
14.4
3.33
3.27
1.47
4.1
0.567
0.131
0.128
0.0.58
0.161
0.161
Ao
Bo
Ko
Po
P
3.13
3.07
1.27
3.9
3.23
3.17
1.37
4.0
0.123
0.120
0.050
0.153
0.153
0.127
0.124
0.054
0.157
0.157
3.9
4.0
4.1
17/20
Package mechanical data
ST1S12xx
Figure 26. TSOT23-5L footprint recommended data
Table 9.
Footprint data
Values
mm.
inch.
A
B
C
D
E
F
3.50
1.10
0.60
0.95
1.20
2.30
0.138
0.043
0.024
0.037
0.047
0.090
18/20
ST1S12xx
Revision history
9
Revision history
Table 10. Document revision history
Date
Revision
Changes
10-Jan-2008
01-Feb-2008
1
2
Initial release.
Modified: Figure 3 on page 9.
19/20
ST1S12xx
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