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ST8R00WPUR
MICROPOWER STEP UP DC/DC CONVERTER
February 2012 Doc ID 13449 Rev 2 1/18
ST8R00Micropower 1 A synchronous step-up DC-DC converter
Features Output voltage adjustable from 6 V to 12 V Output voltage accuracy: ± 2% Output current up to 1 A Low ripple voltage: 5 mV (typ.) Synchronous rectification High 90% efficiency: VO = 9 V (typ.) Few external components Thermal shutdown protection Very small DFN8 (4 x 4 mm) package
DescriptionThe ST8R00 is a synchronous PWM step-up DC-
DC converter. The device is able to provide an
output voltage in the range of 6 to 12 V with an
input voltage from 4 to 6 V. The high switching
frequency (1.7 MHz) permits the use of tiny
surface-mount components. In addition to the
resistor divider to set the output voltage value,
only an inductor and two capacitors are required.
Moreover, 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
available in a very small DFN8 (4 x 4 mm)
package.
Table 1. Device summary
Contents ST8R002/18 Doc ID 13449 Rev 2
Contents Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
ST8R00 Block diagramDoc ID 13449 Rev 2 3/18
1 Block diagram
Figure 1. Schematic diagram
Pin configuration ST8R004/18 Doc ID 13449 Rev 2
2 Pin configuration
Figure 2. Pin connections (top view)
Table 2. Pin description
ST8R00 Typical application circuitDoc ID 13449 Rev 2 5/18
3 Typical application circuit
Figure 3. Application circuit
Maximum ratings ST8R006/18 Doc ID 13449 Rev 2
4 Maximum ratings
Table 3. Absolute maximum ratings
Table 4. Thermal Data
Table 5. ESD Performance
ST8R00 Electrical characteristicsDoc ID 13449 Rev 2 7/18
5 Electrical characteristicsVI = 5 V , VINH = 2 V, IO = 100 mA, TJ = - 25 °C to 125 °C, CI = CO = 10 µF(X7R), L = 4.7 µH
unless otherwise specified.
Table 6. Electrical characteristics For VO higher than 9 V the maximum output current capability is reduced according to LX current limitation Guaranteed by design
Typical characteristics ST8R008/18 Doc ID 13449 Rev 2
6 Typical characteristicsL = 4.7 µH, CI = CO = 10 µF.
Figure 4. Voltage feedback vs. temperature Figure 5. Feedback current vs. temperature
Figure 6. Supply current vs. temperature
(VI = VINH = 5 V)
Figure 7. Supply current vs. temperature
(VINH = 2 V)
Figure 8. Supply current vs. temperature
(VFB = 2 V)
Figure 9. LX current limitation vs.
temperature
ST8R00 Typical characteristicsDoc ID 13449 Rev 2 9/18
Figure 10. Inhibit voltage vs. temperature
(VI = 4 V)
Figure 11. Inhibit voltage vs. temperature
(VI = 6 V)
Figure 12. Line regulation vs. temperature Figure 13. Load regulation vs. temperature
Figure 14. Oscillator frequency vs.
temperature
Figure 15. Max oscillator duty cycle vs.
temperature
