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ST1S09-ST1S09IPUR-ST1S09PUR
Synchronous rectification with inhibit, 2 A, 1.5 MHz adjustable, step-down switching regulator
April 2010 Doc ID 13632 Rev 4 1/18
ST1S092 A, 1.5 MHz PWM step-down switching regulator
with synchronous rectification
Features 1.5 MHz fixed frequency PWM with current
control mode 2 A output current capability Typical efficiency: > 90% 2 % DC output voltage tolerance Two versions available: power good or inhibit Integrated output over-voltage protection Non switching quiescent current: (typ) 1.5 mA
over temperature range RDSON (typ) 100 mΩ Utilizes tiny capacitors and inductors Operating junction temp. -30 °C to 125 °C Available in DFN6 (3 x 3 mm) exposed pad
DescriptionThe ST1S09 is a step-down DC-DC converter
optimized for powering low output voltage
applications. It supplies a current in excess of 2 A
over an input voltage range from 2.7 V to 6 V.
A high PWM switching frequency (1.5 MHz)
allows the use of tiny surface-mount components.
Moreover, since the required synchronous
rectifier is integrated, the number of the external
components is reduced to minimum: a resistor
divider, an inductor and two capacitors. The
Power Good function continuously monitors the
output voltage. An open drain Power Good flag is
released when the output voltage is within
regulation. In addition, 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 output current limited to prevent damages due
to accidental short circuit. The ST1S09 is
available in the DFN6 (3 x 3 mm) package.
Table 1. Device summary Available on request.
ST1S092/18 Doc ID 13632 Rev 4
Contents Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
ST1S09 DiagramDoc ID 13632 Rev 4 3/18
1 Diagram (*) Only for ST1S09IPU
(**) Only for ST1S09PU
Figure 1. Schematic diagram
Pin configuration ST1S094/18 Doc ID 13632 Rev 4
2 Pin configuration
Figure 2. Pin connections (top view)
Table 2. Pin description
ST1S09 Maximum ratingsDoc ID 13632 Rev 4 5/18
3 Maximum ratings 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. Absolute maximum ratings
Table 4. Thermal data
Table 5. ESD performance
Electrical characteristics ST1S096/18 Doc ID 13632 Rev 4
4 Electrical characteristicsRefer to Figure 21 application circuit VIN_SW = VIN_A = 5 V, VO = 1.2 V , C1 = 4.7 µF,
C2 = 22 µF, L1 = 2.7 µH, TJ = -30 to 125 °C (unless otherwise specified. T ypical values are
referred to 25 °C)
Table 6. Electrical characteristics for ST1S09PU Guaranteed by design, but not tested in production.
ST1S09 Electrical characteristicsDoc ID 13632 Rev 4 7/18
Refer to Figure 22 application circuit VIN_SW = VIN_A = VINH = 5 V, VO = 1.2 V, C1 = 4.7 µF,
C2 = 22 µF, L1 = 2.7 µH, TJ = -30 to 125 °C (unless otherwise specified. T ypical values are
referred to 25 °C)
Table 7. Electrical characteristics for ST1S09IPU Guaranteed by design, but not tested in production.
Typical performance characteristics ST1S098/18 Doc ID 13632 Rev 4
Typical performance characteristicsL = 3.3 µH, CI = 4.7 µF , CO = 22 µF, unless otherwise specified.
Figure 3. Voltage feedback vs. temperature Figure 4. Feedback pin bias current vs. temp.
Figure 5. Quiescent current non switching
vs. temperature
Figure 6. Inhibit voltage vs. temperature
Figure 7. Inhibit voltage vs. input voltage Figure 8. Output voltage vs. input voltage
ST1S09 Typical performance characteristicsDoc ID 13632 Rev 4 9/18
Figure 9. Line regulation vs. temperature Figure 10. Load regulation vs. temperature
Figure 11. PWM Switching frequency vs.
temperature
Figure 12. Maximum duty cycle vs.
temperature
Figure 13. Under voltage lock out threshold
vs. temperature
Figure 14. Efficiency vs. output current
