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PDF ST1S03A Data sheet ( Hoja de datos )
| Número de pieza | ST1S03A | |
| Descripción | step-down switching regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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ST1S03A
1.5A, 1.5 MHz Adjustable, with inhibit function
Step-down switching regulator in DFN6 3x3
Features
■ Step-down current mode PWM (1.5MHz) DC-
DC converter
■ 2% DC output voltage tolerance
www.DataSheet4U■.comInternal soft start for start-up current limitation
and power on delay of 50-100µs
■ Typical efficiency: > 85%
■ Inhibit function
■ 1.5A Output current capability
■ Not switching quiescent current: max 1.5mA
over temperature range
■ Switch VDS: max 200mV @ ISW=750mA
■ Uses tiny capacitors and inductors
■ Available in DFN6 3x3 exposed pad
Description
The ST1S03A 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
DFN6 (3x3)
dissipation may cause an high heating of the
application environment. It provides up to 1.5A
over an input voltage range of 3V to 5.5V. 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, a schottky diode 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 ST1S03A is
available in DFN6 (3x3).
Order codes
Part number
ST1S03APMR
ST1S03AIPMR
ST1S03APUR
ST1S03AIPUR
May 2007
Packaging
Tape & reel
Tape & reel
Tape & reel
Tape & reel
Rev. 3
Package
DFN6 (3x3 mm)
DFN6 (3x3 mm)
DFN6D (3x3 mm)
DFN6D (3x3 mm)
1/14
www.st.com
14
1 page  
ST1S03A
3 Maximum ratings
Maximum ratings
Table 2. Absolute maximum ratings
Symbol
VIN_SW
VIN_A
VINH
SWITCH
Voltage
VFB
www.DataSheet4U.com IVFB
TJ
TSTG
TLEAD
Parameter
Positive power supply voltage
Positive power supply voltage
Max voltage of inhibit pin
Max. voltage of output pin
Feedback voltage
Common mode input voltage
Max junction temperature
Storage temperature range
Lead temperature (soldering) 10 sec
Value
-0.3 to 7
-0.3 to 7
-0.3 to 6
-0.3 to 7
2.5
1
150
-25 to 150
300
Unit
V
V
V
V
V
mA
°C
°C
°C
Note: Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Functional Operation under these conditions is not implied.
Table 3. Thermal data
Symbol
RthJA
RthJC
Parameter
Thermal resistance junction-ambient
Thermal resistance junction-case
Value
10
55
Unit
°C/W
°C/W
5/14
5 Page 
ST1S03A
Package mechanical data
Dim.
A
A1
www.DataSheet4U.com
A3
b
D
D2
E
E2
e
L
DFN6D (3x3) Mechanical Data
Min.
0.80
0
0.23
2.90
2.23
2.90
1.50
0.30
mm.
Typ.
0.02
0.20
3.00
3.00
0.95
0.40
Max.
1.00
0.05
0.45
3.10
2.50
3.10
1.75
0.50
Min.
0.031
0
0.009
0.114
0.088
0.114
0.059
0.012
inch.
Typ.
0.001
0.008
0.118
0.118
0.037
0.016
Max.
0.039
0.002
0.018
0.122
0.098
0.122
0.069
0.020
7946637B
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ST1S03A.PDF ] | |
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