STMICROELECTRONICS ST1S06PMR

ST1S06
Synchronous rectification with inhibit, 1.5A, 1.5 MHz fixed or
adjustable, step-down switching regulator in DFN6 3x3
General features
■
Step-down current mode PWM (1.5MHz) DCDC converter
■
2% DC output voltage tolerance
■
Synchronous rectification
■
Inhibit function
■
Internal soft start
■
Typical efficiency:> 90%
■
1.5A Output current capability
■
Not switching quiescent current: max 1.5mA
over temperature range
■
RDS ON typ150mΩ
■
Uses tiny capacitors and inductors
■
Operative junction temp. -30°C to 125°C
■
Available in DFN6 3x3 exposed pad
DFN6 (3x3mm)
Description
The ST1S06 is a step down DC-DC converter
optimized for powering low-voltage digital core in
HDD applications and, generally, to replace the
high current linear solution when the power
dissipation may cause an high heating of the
application environment. It provides up to 1.5A
over an input voltage range of 2.7V to 6V. An high
switching frequency (1.5MHz) allows the use of
tiny surface-mount components: as well as the
resistor divider to set the output voltage value,
only an inductor and two capacitors are required.
Besides, a low output ripple is guaranteed by the
current mode PWM topology and by the use of low
E.S.R. SMD ceramic capacitors. The device is
thermal protected and current limited to prevent
damages due to accidental short circuit. The
ST1S06 is available in DFN6 3x3 package.
Order code
April 2007
Part number
Packaging
Package
ST1S06PM
ST1S06PMR
DFN6 (3x3 mm)
ST1S06PU
ST1S06PUR
DFN6D (3x3 mm)
ST1S06APM
ST1S06APMR
DFN6 (3x3 mm)
ST1S06PM12
ST1S06PM12R
DFN6 (3x3 mm)
ST1S06PM33
ST1S06PM33R
DFN6 (3x3 mm)
ST1S06APU
ST1S06APUR
DFN6D (3x3 mm)
ST1S06PU12
ST1S06PU12R
DFN6D (3x3 mm)
ST1S06PU33
ST1S06PU33R
DFN6D (3x3 mm)
Rev. 5
1/19
www.st.com
19
ST1S06
Contents
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2/19
ST1S06
1
Figure 1.
Diagram
Diagram
Schematic diagram
3/19
ST1S06
Pin configuration
2
Pin configuration
Figure 2.
Pin configuration (top view)
ST1S06A
ST1S06
Note:
Table 1.
* Pin 1 is VFB for ADJ version and VO for Fixed version
Pin description
Pln n°
Symbol
1
2
3
4
FB/VO
GND
SW
VIN_SW
5
VIN_A
Power supply for analogic circuit
6
VINH
Inhibit pin to turn off the device
Exposed pad to be connected to GND
4/19
Note
Feedback voltage / output voltage
System ground
Switching pin
Power supply for the mosfet switch
ST1S06
3
Maximum ratings
Maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
VIN_SW
Positive power supply voltage
-0.3 to 7
V
VIN_A
Positive power supply voltage
V
VINH
Inhibit voltage
-0.3 to 7
-0.3 to VI + 0.3
Max. voltage of output pin
-0.3 to 7
V
Feedback voltage
Output voltage (for VO > 1.6V)
-0.3 to 3
V
VO
-0.3 to 6
V
TJ
SWITCH
Voltage
VFB/VO
V
Max junction temperature
-40 to 150
°C
TSTG
Storage temperature range
-65 to 150
°C
TLEAD
Lead temperature (soldering) 10 sec
260
°C
Note:
Table 3.
Symbol
Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Functional Operation under these conditions is not implied.
Thermal data
Parameter
Value
Unit
RthJA
Thermal resistance junction-ambient
55
°C/W
RthJC
Thermal resistance junction-case
10
°C/W
5/19
ST1S06
Electrical characteristics
4
Electrical characteristics
Table 4.
Electrical characteristics for ST1S06
(VIN_SW =VIN_A =VINH =5V, VO=1.2V, CI =4.7µF, CO =22µF, L1 =3.3µH, TJ =-30 to 125°C
(unless otherwise specified. Typical values are referred to TJ = 25°C)
Symbol
Parameter
FB
IFB
Feedback voltage
VFB pin bias current
VI
Minimum input voltage
Test conditions
IO= 10mA to 1.5A
Min.
Typ.
Max.
Unit
784
800
816
600
mV
nA
2.7
IQ
Quiescent current
IO
Output current
VI = 2.7 to 5.5V Note: 1
1.5
Device ON, VI = 2.7 to 5.5V
1.3
Inhibit threshold
Device ON, VI = 2.7 to 5V
1.2
VINH
V
VINH > 1.2V
VINH < 0.4V, TJ = -30°C to 85°C
mA
1
µA
A
V
Device OFF
IINH
1.5
0.4
2
Inhibit pin current
µA
%VO/
∆VI
%VO/∆VI
Reference line regulation
VI = 2.7V to 5.5V Note: 1
0.2
0.3
%VO/∆IO
Reference load regulation
IO = 10mA to 1.5A Note: 1
0.2
0.3
%VO/
∆IO
PWMfS
PWM Switching frequency
VFB = 0.8V
1.5
1.8
MHz
DMAX
Maximum duty cycle
RDSON-N NMOS Switch on resistance
RDSON-P PMOS Switch on resistance
ISWL
Switching current limitation
ν
Efficiency Note: 1
TSHDN
Thermal shutdown
THYS
1.2
87
%
ISW = 750 mA
80
0.12
Ω
ISW = 750 mA
0.15
Ω
2.3
A
Note: 1
IO = 10mA to 100mA, VO = 3.3V
IO = 100mA to 1.5A, VO = 3.3V
65
%
85
90
130
150
°C
15
°C
Thermal shutdown hysteresis
%VO/∆IO
Load transient response
IO = 100mA to 750mA, TJ = 25°C
tR = tF ≥ 200ns, Note: 1
-5
+5
%VO
%VO/∆IO
Short circuit removal response
IO = 10mA to IO=short, TJ = 25°C
Note: 1
-10
+10
%VO
Note: 1 Guaranteed by design, but not tested in production
6/19
ST1S06
Electrical characteristics
Table 5.
Electrical characteristics for ST1S06PM12
(VIN_SW =VIN_A =VINH =5V, VO=1.2V, CI =4.7µF, CO =22µF, L1 =3.3µH, TJ =-30 to 125°C unless
otherwise specified. Typical values are referred to TJ =25°C)
Symbol
OUT
IO
Parameter
Test conditions
Output feedback pin
IO Pin bias current
VO = 1.5V
VI
Minimum input voltage
IO= 10mA to 1.5A
IQ
Quiescent current
IO
Output current
VINH
Inhibit threshold
IINH
Inhibit pin current
Min.
Typ.
Max.
Unit
1.176
1.2
15
1.224
20
V
µA
2.7
V
VINH > 1.2V
VINH < 0.4V, TJ = -30°C to 85°C
VI = 2.7 to 5.5V Note: 1
1.5
Device ON, VI = 2.7 to 5.5V
1.3
Device ON, VI = 2.7 to 5V
1.2
1.5
mA
1
µA
A
V
Device OFF
0.4
2
µA
%VO/
∆VI
%VO/∆VI
Reference line regulation
VI = 2.7V to 5.5V Note: 1
0.2
0.3
%VO/∆IO
Reference load regulation
IO = 10mA to 1.5A Note: 1
0.2
0.3
%VO/
∆IO
PWMfS
PWM Switching frequency
VFB = 0.8V
1.5
1.8
MHz
DMAX
Maximum duty cycle
RDSON-N NMOS Switch on resistance
RDSON-P PMOS Switch on resistance
ISWL
Switching current limitation
ν
Efficiency Note: 1
TSHDN
Thermal shutdown
THYS
1.2
87
%
ISW = 750 mA
80
0.12
Ω
ISW = 750 mA
0.15
Ω
Note: 1
IO = 10mA to 100mA, VO = 1.2V
IO = 100mA to 1.5A, VO = 1.2V
2.3
A
60
85
130
150
°C
15
°C
Thermal shutdown hysteresis
%VO/∆IO
Load transient response
IO = 100mA to 750mA, TJ = 25°C
tR = tF ≥ 200ns, Note: 1
%VO/∆IO
Short circuit removal response
IO = 10mA to IO=short, TJ = 25°C
Note: 1
%
80
-5
+5
%VO
-10
+10
%VO
Note: 1 Guaranteed by design, but not tested in production
7/19
ST1S06
Electrical characteristics
Table 6.
Electrical characteristics for ST1S06PM33
(VIN_SW =VIN_A =VINH =5V, VO=3.3V, CI =4.7µF, CO =22µF, L1 =3.3µH, TJ =-30 to 125°C unless
otherwise specified. Typical values are referred to TJ =25°C)
Symbol
OUT
IO
Parameter
Test conditions
Output feedback pin
IO Pin bias current
VO = 3.5V
VI
Minimum input voltage
IO= 10mA to 1.5A
IQ
Quiescent current
IO
Output current
VINH
Inhibit threshold
IINH
Inhibit pin current
Min.
Typ.
Max.
Unit
3.23
3.3
15
3.37
20
V
µA
4.2
V
VINH > 1.2V
VINH < 0.4V, TJ = -30°C to 85°C
VI = 4.2 to 5.5V Note: 1
1.5
Device ON, VI = 4.2 to 5.5V
1.3
Device ON, VI = 4.2 to 5V
1.2
1.5
mA
1
µA
A
V
Device OFF
0.4
2
µA
%VO/
∆VI
%VO/∆VI
Reference line regulation
VI = 4.2V to 5.5V Note: 1
0.2
0.3
%VO/∆IO
Reference load regulation
IO = 10mA to 1.5A Note: 1
0.2
0.3
%VO/
∆IO
PWMfS
PWM Switching frequency
VFB = 0.8V
1.5
1.8
MHz
DMAX
Maximum duty cycle
RDSON-N NMOS Switch on resistance
RDSON-P PMOS Switch on resistance
ISWL
Switching current limitation
ν
Efficiency Note: 1
TSHDN
Thermal shutdown
THYS
87
%
ISW = 750 mA
80
0.12
Ω
ISW = 750 mA
0.15
Ω
Note: 1
IO = 10mA to 100mA, VO = 3.3V
IO = 100mA to 1.5A, VO = 3.3V
2.3
A
65
%VO/∆IO
Load transient response
%VO/∆IO
Short circuit removal response
IO = 10mA to IO=short, TJ = 25°C
Note: 1
Note: 1 Guaranteed by design, but not tested in production
%
85
90
130
150
°C
15
°C
Thermal shutdown hysteresis
IO = 100mA to 750mA, TJ = 25°C
tR = tF ≥ 200ns, Note: 1
8/19
1.2
-5
+5
%VO
-10
+10
%VO
ST1S06
5
Typical performance characteristics
Typical performance characteristics
(VIN_SW =VIN_A =VINH =5V, CI = 4.7µF, CO = 22µF, L1 =3.3µH, unless otherwise specified.
Typical values are referred to 25°C)
Figure 3.
Efficiency vs output current
Figure 4.
Efficiency vs output current
Figure 5.
Efficiency vs output current
Figure 6.
Efficiency vs output current
Figure 7.
Efficiency vs output current
Figure 8.
Efficiency vs inductor
9/19
Typical performance characteristics
Figure 9.
Voltage feedback vs temperature
ST1S06
Figure 10. Input voltage vs output voltage
Figure 11. Feedback pin bias current vs
temperature
Figure 12. Quiescent current vs temperature
Figure 13. Quiescent current vs temperature
Figure 14. Inhibit voltage vs input voltage
10/19
ST1S06
Typical performance characteristics
Figure 15. Inhibit voltage vs temperature
Figure 16. Inhibit voltage vs temperature
Figure 17. Line regulation vs temperature
Figure 18. Load regulation vs temperature
Figure 19. PWM Switching Frequency vs
temperature
Figure 20. NMOS Switch on resistance vs
temperature
11/19
ST1S06
Typical performance characteristics
Figure 21. PMOS Switch on resistance vs
temperature
Figure 22. Inhibit transient
VI = 5V, VINH = 0 to 2V, IO = 1.5A
Figure 23. Inhibit transient
VI = 5V, VINH = 0 to 2V, IO = 10mA
12/19
ST1S06
6
Typical application
Typical application
Figure 24. Application circuit
Application notes
The ST1S06 is an adjustable current mode PWM step-down DC/DC converter with internal 1.5A power
switch, packaged in a 6-lead DFN 3x3.
It’s a complete 1.5A switching regulator with its internal compensation eliminating additional component.
The constant frequency, current mode, PWM architecture and stable operation with ceramic capacitors
results in low, predictable output ripple. However, in order to maximize the power conversion efficiency
with light load, the regulator reduces automatically the switching frequency when the output load
becomes less than 250mA typically.
To clamp the error amplifier reference voltage a Soft Start control block generating a voltage ramp, has
been implemented. Besides an On-Chip Power on Reset of 50=100µs ensure the proper operation when
switching on the power supply. Other circuits fitted to the device protection are the Thermal Shut down
block which turn off the regulator when the junction temperature exceeds 150°C typically and the Cycleby-cycle Current Limiting that provides protection against shorted outputs.
Being the ST1S06 an adjustable regulator, the output voltage is determined by an external resistor
divider. The desired value is given by the following equation:
VO = VFB[1+R1/R2]
To make the device working, only few component are required: an inductor and two capacitors and the
resistor divider. The chosen inductor must be able to not saturate at the peak current level. Besides, its
value can be selected keeping in account that a large inductor value increases the efficiency at low output
current and reduces output voltage ripple, while a smaller inductor can be chosen when it is important to
reduce the package size and the total cost of the application. Finally, the ST1S06 has been designed to
work properly with X5R or X7R SMD ceramic capacitors both at the input and at the output. this kind of
capacitors, thanks 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 invalidate the right
functioning of the device.
13/19
Package mechanical data
7
ST1S06
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.
14/19
ST1S06
Package mechanical data
DFN6 (3x3) MECHANICAL DATA
mm.
inch.
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
0.80
1.00
0.031
0.039
A1
0
0.05
0.0
0.02
A2
0.65
0.75
0.026
0.030
A3
0.20
b
0.33
D
2.90
D2
1.92
E
2.90
E2
1.11
e
L
3.00
0.43
0.013
3.10
0.114
2.12
0.076
3.10
0.114
1.31
0.044
0.95
0.20
L1
0.45
0.118
0.122
0.083
0.118
0.122
0.052
0.008
0.018
0.009
0.13
0.20
0.017
0.037
0.24
L2
K
3.00
0.08
0.005
0.008
7387339A
15/19
ST1S06
Package mechanical data
DFN6D (3x3) MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
0.80
A1
0
A3
0.02
MAX.
MIN.
1.00
0.031
0.05
0
0.20
b
0.23
D
2.90
D2
2.23
E
2.90
E2
1.50
e
L
TYP
3.00
3.00
0.40
MAX.
0.039
0.001
0.002
0.008
0.45
0.009
3.10
0.114
2.50
0.088
3.10
0.114
1.75
0.059
0.95
0.30
TYP.
0.018
0.118
0.122
0.098
0.118
0.122
0.069
0.037
0.50
0.012
0.016
0.020
7946637B
16/19
ST1S06
Package mechanical data
Tape & Reel QFNxx/DFNxx (3x3) MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MAX.
MIN.
TYP.
330
13.2
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
MAX.
0.504
0.519
18.4
0.724
Ao
3.3
0.130
Bo
3.3
0.130
Ko
1.1
0.043
Po
4
0.157
P
8
0.315
17/19
ST1S06
Revision history
8
Revision history
Table 7.
Revision history
Date
Revision
08-May-2006
1
Initial release.
06-Jun-2006
2
Table 2. has been updated.
16-Oct-2006
3
Add new mechanical data DFN6D.
09-Nov-2006
4
Mechanical data information for DFN6 has been update.
03-Apr-2007
5
Tape & Reel has been updated.
18/19
Changes
ST1S06
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