ST8R00PUR STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 18
Technical content
Datasheet sections
- 1 Block diagram
- 2 Pin configuration
- 3 Typical application circuit
- 4 Maximum ratings
- 5 Electrical characteristics
- 6 Typical characteristics
- 7 Package mechanical data
- 8 Revision history
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
Description
The 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. DFN8 4 x 4 mm Table 1. Device summary
1 Block diagram
Figure 1. Schematic diagram
2 Pin configuration
Figure 2. Pin connections (top view) Table 2. Pin description
1 LX Switching output
2 PGND Power ground
3 GND Analog ground
4 IN Power input for analog circuit
5 FB Feedback
Inhibit. Connecting the pin to a voltage higher than 2 V = device ON.
7 HV Trimming (floating or connected to GND)
8 OUT Output voltage
3 Typical application circuit
Figure 3. Application circuit
4 Maximum ratings
Table 3. Absolute maximum ratings Table 4. Thermal Data Table 5. ESD Performance
5 Electrical characteristics
Table 6. Electrical characteristics
- For V O higher than 9 V the maximum output current capability is reduced according to LX current limitation
6 Typical characteristics
Figure 4. Voltage feedback vs. temperature Figure 5. Feedback current vs. temperature Figure 6. Supply current vs. temperature Figure 7. Supply current vs. temperature Figure 8. Supply current vs. temperature Figure 9. LX current limitation vs.
Figure 28. Inrush current
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.
Dim. mm. inch. A1 0 0.02 0.05 0 0.001 0.002 A3 0.20 0.00 8 e0 . 800 . 0 31 DFN8 (4x4) Mechanical Data 7869653B
Figure 29. DFN8 (4 x 4) footprint recommended data
Dim. mm. inch. A 330 12. 992 C 12. 8 13.2 0.504 0.51 9 D 20.2 0.7 95 N 99 101 3.898 3 .976 T 14.4 0.567 Ao 4. 35 0.171 Bo 4. 35 0.171 Ko 1.1 0.04 3 Po 4 0.157 P 8 0.315 Tape & Reel QFNxx/DFNxx (4x4) Mechanical Data
8 Revision history
Table 7. Document revision history 24-May-2007 1 Initial release. 01-Feb-2012 2 Modified: Figure 8 on page 8. Removed: Table 6, Figures 24, 25 and 26.