ST1S06xx Synchronous 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) DCDC 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 m Uses tiny capacitors and inductors Operative junction temp. - 30 C to 125 C Available in DFN6D (3x3 mm) exposed pad DFN6D (3x3 mm) Description 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. The 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. Table 1. Device summary Part numbers Marking Order codes Package ST1S06 ST1S06 ST1S06PUR DFN6D (3 x 3 mm) ST1S06A ST1S06A ST1S06APUR DFN6D (3 x 3 mm) ST1S06XX12 1S0612 ST1S06PU12R DFN6D (3 x 3 mm) ST1S06XX33 1S0633 ST1S06PU33R DFN6D (3 x 3 mm) May 2009 Doc ID 12236 Rev 9 1/20 www.st.com 20 Contents ST1S06xx Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 Doc ID 12236 Rev 9 ST1S06xx Diagram 1 Diagram Figure 1. Schematic diagram Doc ID 12236 Rev 9 3/20 Pin configuration ST1S06xx 2 Pin configuration Figure 2. Pin configuration (top view) ST1S06A ST1S06 * Pin 1 is VFB for ADJ version and VO for Fixed version Table 2. Pin description Pin n Symbol Note 1 FB/VO Feedback voltage / output voltage 2 GND System ground 3 SW 4 VIN_SW 5 VIN_A Power supply for analogic circuit 6 VINH Inhibit pin to turn off the device Switching pin Power supply for the mosfet switch Exposed pad to be connected to GND 4/20 Doc ID 12236 Rev 9 ST1S06xx Maximum ratings 3 Maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit VIN_SW Positive power supply voltage -0.3 to 7 V VIN_A Positive power supply voltage -0.3 to 7 V VINH Inhibit voltage -0.3 to VI + 0.3 V -0.3 to 7 V -0.3 to 2.5 V -0.3 to 6 V SWITCH voltage VFB/VO Max. voltage of output pin Feedback voltage VO Output voltage (for VO > 1.6 V) TJ Max junction temperature -40 to 150 C TSTG Storage temperature range -65 to 150 C TLEAD Lead temperature (soldering) 10 sec 260 C Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Table 4. Thermal data Symbol Parameter Value Unit RthJA Thermal resistance junction-ambient 55 C/W RthJC Thermal resistance junction-case 10 C/W Doc ID 12236 Rev 9 5/20 Electrical characteristics 4 ST1S06xx Electrical characteristics VIN_SW = VIN_A = VINH = 5 V, VO = 1.2 V, CI = 4.7 F, CO = 22 F, L1 = 3.3 H, TJ = -30 C to 125 C unless otherwise specified. Typical values are referred to TJ = 25 C. Table 5. Electrical characteristics for ST1S06 Symbol Parameter FB Feedback voltage IFB VFB pin bias current VI Minimum input voltage IQ Quiescent current IO Output current Test conditions IO = 10mA to 1.5A Min. Typ. Max. Unit 784 800 816 mV 600 nA 2.7 V VINH > 1.2V VINH < 0.4V, TJ = -30C to 85C VINH Inhibit threshold VI = 2.7 to 5.5V Note 1 1.5 Device ON, VI = 2.7 to 5.5V 1.3 Device ON, VI = 2.7 to 5V 1.2 mA 1 A A V Device OFF IINH 1.5 0.4 Inhibit pin current 2 A %VO/VI Reference line regulation VI = 2.7V to 5.5V Note 1 0.2 0.3 %VO/ VI %VO/IO Reference load regulation IO = 10mA to 1.5A Note 1 0.2 0.3 %VO/ IO PWMfS PWM switching frequency VFB = 0.8V 1.2 1.5 1.8 MHz 80 87 % DMAX Maximum duty cycle RDSON-N NMOS switch on resistance ISW = 750 mA 0.12 RDSON-P PMOS switch on resistance ISW = 750 mA 0.15 ISWL Switching current limitation Note 1 2.3 A Efficiency Note 1 TSHDN IO = 10mA to 100mA, VO = 3.3V 65 IO = 100mA to 1.5A, VO = 3.3V 85 90 130 150 C 15 C Thermal shutdown % Thermal shutdown hysteresis THYS %VO/IO Load transient response IO = 100mA to 750mA, TJ = 25C tR = tF 200ns, Note 1 -5 +5 %VO %VO/IO Short circuit removal response IO = 10mA to IO = short, TJ = 25C Note 1 -10 +10 %VO Note: 6/20 1 Guaranteed by design, but not tested in production Doc ID 12236 Rev 9 ST1S06xx Electrical characteristics VIN_SW = VIN_A = VINH = 5 V, VO = 1.2 V, CI = 4.7 F, CO = 22 F, L1 = 3.3 H, TJ = -30 C to 125 C unless otherwise specified. Typical values are referred to TJ = 25 C. Table 6. Electrical characteristics for ST1S06PM12 Symbol OUT Parameter Test conditions Output feedback pin IO IO pin bias current VO = 1.5V VI Minimum input voltage IO = 10mA to 1.5A IQ Quiescent current IO Output current Min. Typ. Max. Unit 1.176 1.2 1.224 V 15 20 A 2.7 V VINH > 1.2V VINH < 0.4V, TJ = -30C to 85C VINH Inhibit threshold VI = 2.7 to 5.5V Note 1 1.5 Device ON, VI = 2.7 to 5.5V 1.3 Device ON, VI = 2.7 to 5V 1.2 mA 1 A A V Device OFF IINH 1.5 0.4 Inhibit pin current 2 A %VO/VI Reference line regulation VI = 2.7V to 5.5V Note 1 0.2 0.3 %VO/ VI %VO/IO Reference load regulation IO = 10mA to 1.5A Note 1 0.2 0.3 %VO/ IO PWMfS PWM switching frequency VFB = 0.8V 1.2 1.5 1.8 MHz 80 87 % Maximum duty cycle DMAX RDSON-N NMOS switch on resistance ISW = 750 mA 0.12 RDSON-P PMOS switch on resistance ISW = 750 mA 0.15 ISWL Switching current limitation Note 1 2.3 A Efficiency Note 1 TSHDN IO = 10mA to 100mA, VO = 1.2V 60 IO = 100mA to 1.5A, VO = 1.2V 80 85 130 150 C 15 C Thermal shutdown % Thermal shutdown hysteresis THYS %VO/IO Load transient response IO = 100mA to 750mA, TJ = 25C tR = tF 200ns, Note 1 -5 +5 %VO %VO/IO Short circuit removal response IO = 10mA to IO = short, TJ = 25C Note 1 -10 +10 %VO Note: 1 Guaranteed by design, but not tested in production Doc ID 12236 Rev 9 7/20 Electrical characteristics ST1S06xx VIN_SW = VIN_A = VINH = 5 V, VO = 3.3 V, CI = 4.7 F, CO = 22 F, L1 = 3.3 H, TJ = -30 C to 125 C unless otherwise specified. Typical values are referred to TJ = 25 C. Table 7. Electrical characteristics for ST1S06PM33 Symbol OUT Parameter Test conditions Output feedback pin IO IO pin bias current VO = 3.5V VI Minimum input voltage IO = 10mA to 1.5A IQ Quiescent current IO Output current Min. Typ. Max. Unit 3.23 3.3 3.37 V 15 20 A 4.2 V VINH > 1.2V VINH < 0.4V, TJ = -30C to 85C VINH Inhibit threshold VI = 4.2 to 5.5V Note 1 1.5 Device ON, VI = 4.2 to 5.5V 1.3 Device ON, VI = 4.2 to 5V 1.2 mA 1 A A V Device OFF IINH 1.5 0.4 Inhibit pin current 2 A %VO/VI Reference line regulation VI = 4.2V to 5.5V Note 1 0.2 0.3 %VO/ VI %VO/IO Reference load regulation IO = 10mA to 1.5A Note 1 0.2 0.3 %VO/ IO PWMfS PWM switching frequency VFB = 0.8V 1.2 1.5 1.8 MHz 80 87 % Maximum duty cycle DMAX RDSON-N NMOS switch on resistance ISW = 750 mA 0.12 RDSON-P PMOS switch on resistance ISW = 750 mA 0.15 ISWL Switching current limitation Note 1 2.3 A Efficiency Note 1 TSHDN IO = 10mA to 100mA, VO = 3.3V 65 IO = 100mA to 1.5A, VO = 3.3V 85 90 130 150 C 15 C Thermal shutdown % Thermal shutdown hysteresis THYS %VO/IO Load transient response IO = 100mA to 750mA, TJ = 25C tR = tF 200ns, Note 1 -5 +5 %VO %VO/IO Short circuit removal response IO = 10mA to IO = short, TJ = 25C Note 1 -10 +10 %VO Note: 8/20 1 Guaranteed by design, but not tested in production Doc ID 12236 Rev 9 ST1S06xx 5 Typical performance characteristics Typical performance characteristics VIN_SW = VIN_A = VINH = 5 V, CI = 4.7 F, CO = 22 F, L1 = 3.3 H, 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 Doc ID 12236 Rev 9 9/20 Typical performance characteristics Figure 9. ST1S06xx 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 10/20 Doc ID 12236 Rev 9 ST1S06xx Typical performance characteristics Figure 15. Inhibit voltage vs. temperature Figure 16. Inhibit voltage vs. temperature Figure 17. Line regulation vs. temperature Figure 18. Load regulation vs. temperature Figure 19. PWM switching frequency vs. temperature Figure 20. NMOS switch on resistance vs. temperature Doc ID 12236 Rev 9 11/20 Typical performance characteristics ST1S06xx Figure 21. PMOS switch on resistance vs. temperature Figure 22. Inhibit transient VI = 5 V, VINH = 0 to 2 V, IO = 1.5 A Figure 23. Inhibit transient VI = 5 V, VINH = 0 to 2 V, IO = 10 mA 12/20 Doc ID 12236 Rev 9 ST1S06xx 6 Typical application Typical application Figure 24. Application circuit Doc ID 12236 Rev 9 13/20 Application notes 7 ST1S06xx Application notes The ST1S06xx is an adjustable current mode PWM step-down DC-DC converter with internal 1.5 A power switch, packaged in a 6-lead DFN 3x3. It's a complete 1.5 A switching regulator with its internal compensation eliminating additional component. The constant frequency, current mode, PWM architecture and stable operation with ceramic capacitors results in low, predictable output ripple. However, in order to maximize the power conversion efficiency with light load, the regulator reduces automatically the switching frequency when the output load becomes less than 250 mA typically. To clamp the error amplifier reference voltage a soft start control block generating a voltage ramp, has been implemented. Besides an on-chip power on reset of 50 = 100 s ensure the proper operation when switching on the power supply. Other circuits fitted to the device protection are the thermal shut down block which turn off the regulator when the junction temperature exceeds 150 C typically and the cycle-by-cycle current limiting that provides protection against shorted outputs. Being the ST1S06xx an adjustable regulator, the output voltage is determined by an external resistor divider. The desired value is given by the following equation: VO = VFB [1 + R1 / R2] To make the device working, only few component are required: an inductor and two capacitors and the resistor divider. The chosen inductor must be able to not saturate at the peak current level. Besides, its value can be selected keeping in account that a large inductor value increases the efficiency at low output current and reduces output voltage ripple, while a smaller inductor can be chosen when it is important to reduce the package size and the total cost of the application. Finally, the ST1S06xx 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. Other low ESR capacitors can be used according to the need of the application without invalidate the right functioning of the device. 14/20 Doc ID 12236 Rev 9 ST1S06xx 8 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark. Doc ID 12236 Rev 9 15/20 Package mechanical data ST1S06xx DFN6D (3x3 mm) mechanical data mm. inch. Dim. Min. A 0.80 A1 0 A3 0.02 Max. Min. 1.00 0.031 0.05 0 0.20 b 0.23 D 2.90 D2 2.23 E 2.90 E2 1.50 e L Typ. 3.00 3.00 0.40 Max. 0.039 0.001 0.002 0.008 0.45 0.009 3.10 0.114 2.50 0.088 3.10 0.114 1.75 0.059 0.95 0.30 Typ. 0.018 0.118 0.122 0.098 0.118 0.122 0.069 0.037 0.50 0.012 0.016 0.020 7946637B 16/20 Doc ID 12236 Rev 9 ST1S06xx Package mechanical data Tape and reel QFNxx/DFNxx (3x3 mm) mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. 330 13.2 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 0.504 0.519 18.4 0.724 Ao 3.3 0.130 Bo 3.3 0.130 Ko 1.1 0.043 Po 4 0.157 P 8 0.315 Doc ID 12236 Rev 9 Max. 17/20 Package mechanical data ST1S06xx Figure 25. DFN6 (3x3 mm) footprint recommended data 18/20 Doc ID 12236 Rev 9 ST1S06xx Revision history 9 Revision history Table 8. Document revision history Date Revision Changes 08-May-2006 1 Initial release. 06-Jun-2006 2 Table 3 updated. 16-Oct-2006 3 Add new mechanical data DFN6D. 09-Nov-2006 4 Mechanical data information for DFN6 update. 03-Apr-2007 5 Tape and reel updated. 12-Mar-2008 6 Added: Table 1 on page 1. 15-Apr-2008 7 Modified: Figure 6 on page 9. 10-Apr-2009 8 Modified: Table 3 on page 5. 06-May-2009 9 Added: marking Table 1 on page 1. Doc ID 12236 Rev 9 19/20 ST1S06xx Please Read Carefully: 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. 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