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ST1S06-ST1S06APUR-ST1S06PU33R-ST1S06PUR
Synchronous rectification with inhibit, 1.5 A, 1.5 MHz adjustable, step-down switching regulator
ST1S06xxSynchronous rectification with inhibit, 1.5 A, 1.5 MHz fixed or
adjustable, step-down switching regulator
Features Step-down current mode PWM (1.5 MHz) DC-
DC converter 2% DC output voltage tolerance Synchronous rectification Inhibit function Internal soft start Typical efficiency: > 90 % 1.5 A output current capability Not switching quiescent current: max 1.5 mA
over temperature range RDS(ON) typ.150 mΩ Uses tiny capacitors and inductors Operative junction temp. - 30 °C to 125 °C Available in DFN6D (3x3 mm) exposed pad
DescriptionThe ST1S06xx 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
over an input voltage range of 2.7 V to 6 V . An high
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 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
ST1S06xx is available in DFN6D (3x3 mm)
package.
Table 1. Device summary
Contents ST1S06xx
Contents Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
ST1S06xx Diagram
1 Diagram
Figure 1. Schematic diagram
Pin configuration ST1S06xx Pin configuration * Pin 1 is VFB for ADJ version and VO for Fixed version
Figure 2. Pin configuration (top view)
Table 2. Pin description
ST1S06xx Maximum ratings
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
Electrical characteristics ST1S06xx
4 Electrical characteristicsVIN_SW = VIN_A = VINH = 5 V, VO = 1.2 V , CI = 4.7 µF , CO = 22 µF , L1 = 3.3 µH, TJ = -30 °C to
125 °C unless otherwise specified. T ypical values are referred to TJ = 25 °C.
Note: 1 Guaranteed by design, but not tested in production
Table 5. Electrical characteristics for ST1S06
ST1S06xx Electrical characteristics VIN_SW = VIN_A = VINH = 5 V, VO = 1.2 V , CI = 4.7 µF , CO = 22 µF , L1 = 3.3 µH, TJ = -30 °C to
125 °C unless otherwise specified. T ypical values are referred to TJ = 25 °C.
Note: 1 Guaranteed by design, but not tested in production
Table 6. Electrical characteristics for ST1S06PM12
Electrical characteristics ST1S06xxVIN_SW = VIN_A = VINH = 5 V, VO = 3.3 V , CI = 4.7 µF , CO = 22 µF , L1 = 3.3 µH, TJ = -30 °C to
125 °C unless otherwise specified. T ypical values are referred to TJ = 25 °C.
Note: 1 Guaranteed by design, but not tested in production
Table 7. Electrical characteristics for ST1S06PM33
ST1S06xx Typical performance characteristics Typical performance characteristicsVIN_SW = VIN_A = VINH = 5 V, CI = 4.7 µF , CO = 22 µF, L1 = 3.3 µH, 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
Typical performance characteristics ST1S06xx
Figure 9. Voltage feedback vs. temperature 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
