ST1S03

Manufacturer Part NumberST1S03
Description1.5 A, 1.5 MHz adjustable, step-down switching regulator
ManufacturerSTMicroelectronics
ST1S03 datasheet
 


Specifications of ST1S03

Typical Efficiency> 70% over all operating conditionsNot Switching Quiescent Currentmax 2.5mA over temperature range
Switch Vdsmax 350mV @ ISW=750mA  
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Features
Step-down current mode PWM (1.5 MHz)
DC-DC converter
2 % DC output voltage tolerance
Internal soft start for START-UP current
limitation and power on delay of 50-100 µs
Typical efficiency: > 70 % over all operating
conditions
1.5 A output current capability
Not switching quiescent current: max 2.5 mA
over temperature range
Switch V
: max 350 mV @ I
DS
Uses tiny capacitors and inductors
Available in DFN 3x3 mm exposed pad
Description
The ST1S03 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 1.5 A
Table 1.
Device summary
Order code
ST1S03PU
March 2008
step-down switching regulator
= 750 mA
over an input voltage range of 3 V to 16 V. An high
SW
switching frequency (1.5 MHz) 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 ESR SMD ceramic
capacitors. The device is thermal protected and
current limited to prevent damages due to
accidental short circuit. The ST1S03 is available
in DFN6.
Packaging
ST1S03PUR
Rev 6
ST1S03
1.5 A, 1.5 MHz adjustable,
DFN6D (3x3mm)
Package
DFN6D (3x3 mm)
1/16
www.st.com
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ST1S03 Summary of contents

  • Page 1

    ... Uses tiny capacitors and inductors ■ Available in DFN 3x3 mm exposed pad Description The ST1S03 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 ...

  • Page 2

    Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • Page 3

    Diagram Figure 1. Schematic diagram 3/16 ...

  • Page 4

    Pin configuration Figure 2. Pin connections (top view) Table 2. Pin description Pin n° Symbol GND IN_SW 5 V IN_A 6 N.C. 4/16 Name and function Voltage of feedback System ground ...

  • Page 5

    Maximum ratings Table 3. Absolute maximum ratings Symbol V Positive power supply voltage IN_SW V Positive power supply voltage IN_A SWITCH voltage Max voltage of output pin V Feedback voltage FB I Common mode input voltage VFB T Max ...

  • Page 6

    Electrical characteristics Table 5. Electrical characteristics ( 125 °C, unless otherwise specified. Typical values are referred to 25 °C) J Symbol Parameter FB Feedback voltage I V pin bias current Quiescent current ...

  • Page 7

    ... Finally, the ST1S03 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 ...

  • Page 8

    Typical application Figure 3. Application circuits 8/16 ...

  • Page 9

    Typical performance characteristics (L1 = 3.3 µ 4.7 µ Figure 4. Load voltage feedback vs temp. Figure 6. Line output voltage regulation vs temperature Figure 8. Voltage feedback vs output current Figure ...

  • Page 10

    Figure 10. Quiescent current vs temperature Figure 12. Minimum operating voltage vs output voltage Figure 14. Efficiency vs output current 10/16 Figure 11. Quiescent current vs input voltage Figure 13. Efficiency vs temperature Figure 15. Switch V vs temperature DS ...

  • Page 11

    Figure 16. Switch RDS-ON vs temperature Figure 18. Load transient response V =5V, I =100mA to 780mA, C =4.7µ L=3.3µH, T =38µs, T =25° Figure 20. Start-Up transient 25°C ...

  • Page 12

    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 ...

  • Page 13

    DFN6D (3x3 mm) mechanical data mm. Dim. Min. Typ 0.02 A3 0.20 b 0.23 D 2.90 3.00 D2 2.23 E 2.90 3.00 E2 1.50 e 0.95 L 0.30 0.40 inch. Max. Min. Typ. 1.00 0.031 0.05 ...

  • Page 14

    Tape & Reel QFNxx/DFNxx (3x3) Mechanical Data Dim. Min 12 14/16 mm. Typ. Max. Min. 330 13.2 0.504 0.795 2.362 18.4 3.3 3.3 1 inch. Typ. ...

  • Page 15

    Revision history Table 6. Document revision history Date Revision 11-Nov-2004 1 08-Feb-2005 2 03-Mar-2005 3 13-Jul-2005 4 29-Mar-2007 5 07-Mar-2008 6 Changes First Release. Maturity Change. Mistake on Figure changed 125 ==> 150°C on Table 3. ...

  • Page 16

    ... Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...