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| 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 exposed pad 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 ST1S06 is available in DFN6D 3x3 package. DFN6D (3x3 mm) Description The ST1S06 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 Table 1. Device summary Part numbers ST1S06 ST1S06A ST1S06XX12 ST1S06XX33 Order codes ST1S06PUR ST1S06APUR ST1S06PU12R ST1S06PU33R Package DFN6D (3x3 mm) DFN6D (3x3 mm) DFN6D (3x3 mm) DFN6D (3x3 mm) April 2008 Rev 7 1/20 www.st.com Contents ST1S06XX Contents 1 2 3 4 5 6 7 8 9 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 2/20 ST1S06XX Diagram 1 Figure 1. Diagram Schematic diagram 3/20 Pin configuration ST1S06XX 2 Figure 2. Pin configuration Pin configuration (top view) ST1S06 ST1S06A Note: Table 2. Pin n 1 2 3 4 5 6 * Pin 1 is VFB for ADJ version and VO for Fixed version Pin description Symbol FB/VO GND SW VIN_SW VIN_A VINH Feedback voltage / output voltage System ground Switching pin Power supply for the mosfet switch Power supply for analogic circuit Inhibit pin to turn off the device Exposed pad to be connected to GND Note 4/20 ST1S06XX Maximum ratings 3 Table 3. Symbol VIN_SW VIN_A VINH SWITCH voltage VFB/VO VO TJ TSTG TLEAD Maximum ratings Absolute maximum ratings Parameter Positive power supply voltage Positive power supply voltage Inhibit voltage Max. voltage of output pin Feedback voltage Output voltage (for VO > 1.6 V) Max junction temperature Storage temperature range Lead temperature (soldering) 10 sec Value -0.3 to 7 -0.3 to 7 -0.3 to VI + 0.3 -0.3 to 7 -0.3 to 3 -0.3 to 6 -40 to 150 -65 to 150 260 Unit V V V V V V C C C Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Thermal data Parameter Thermal resistance junction-ambient Thermal resistance junction-case Value 55 10 Unit C/W C/W Table 4. Symbol RthJA RthJC 5/20 Electrical characteristics ST1S06XX 4 Table 5. Electrical characteristics Electrical characteristics for ST1S06 (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) Parameter Feedback voltage VFB pin bias current Minimum input voltage Quiescent current Output current IO = 10mA to 1.5A VINH > 1.2V VINH < 0.4V, TJ = -30C to 85C VI = 2.7 to 5.5V Note 1 Device ON, VI = 2.7 to 5.5V VINH Inhibit threshold Device ON, VI = 2.7 to 5V Device OFF IINH Inhibit pin current Reference line regulation Reference load regulation PWM switching frequency Maximum duty cycle NMOS switch on resistance PMOS switch on resistance Switching current limitation Efficiency Note 1 Thermal shutdown Thermal shutdown hysteresis Load transient response Short circuit removal response IO = 100mA to 750mA, TJ = 25C tR = tF 200ns, Note 1 IO = 10mA to IO = short, TJ = 25C Note 1 -5 -10 ISW = 750 mA ISW = 750 mA Note 1 IO = 10mA to 100mA, VO = 3.3V IO = 100mA to 1.5A, VO = 3.3V 65 % 85 130 90 150 15 +5 +10 C C %VO %VO VI = 2.7V to 5.5V Note 1 IO = 10mA to 1.5A Note 1 VFB = 0.8V 1.2 80 0.2 0.2 1.5 87 0.12 0.15 2.3 1.5 1.3 1.2 0.4 2 0.3 0.3 1.8 A %VO/ VI %VO/ IO MHz % A V 2.7 1.5 1 Test conditions Min. 784 Typ. 800 Max. 816 600 Unit mV nA V mA A A Symbol FB IFB VI IQ IO %VO/VI %VO/IO PWMfS DMAX RDSON-N RDSON-P ISWL TSHDN THYS %VO/IO %VO/IO Note: 1 Guaranteed by design, but not tested in production 6/20 ST1S06XX Electrical characteristics Table 6. Electrical characteristics for ST1S06PM12 (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) Parameter Output feedback pin IO pin bias current Minimum input voltage Quiescent current Output current VO = 1.5V IO = 10mA to 1.5A VINH > 1.2V VINH < 0.4V, TJ = -30C to 85C VI = 2.7 to 5.5V Note 1 Device ON, VI = 2.7 to 5.5V 1.5 1.3 1.2 0.4 2 VI = 2.7V to 5.5V Note 1 IO = 10mA to 1.5A Note 1 VFB = 0.8V 1.2 80 ISW = 750 mA ISW = 750 mA Note 1 IO = 10mA to 100mA, VO = 1.2V IO = 100mA to 1.5A, VO = 1.2V Thermal shutdown Thermal shutdown hysteresis Load transient response Short circuit removal response IO = 100mA to 750mA, TJ = 25C tR = tF 200ns, Note 1 IO = 10mA to IO = short, TJ = 25C Note 1 -5 -10 60 % 80 130 85 150 15 +5 +10 C C %VO %VO 0.2 0.2 1.5 87 0.12 0.15 2.3 0.3 0.3 1.8 A %VO/ VI %VO/ IO MHz % A V 2.7 1.5 1 Test conditions Min. 1.176 Typ. 1.2 15 Max. 1.224 20 Unit V A V mA A A Symbol OUT IO VI IQ IO VINH Inhibit threshold Device ON, VI = 2.7 to 5V Device OFF IINH %VO/VI %VO/IO PWMfS DMAX RDSON-N RDSON-P ISWL TSHDN THYS %VO/IO %VO/IO Inhibit pin current Reference line regulation Reference load regulation PWM switching frequency Maximum duty cycle NMOS switch on resistance PMOS switch on resistance Switching current limitation Efficiency Note 1 Note: 1 Guaranteed by design, but not tested in production 7/20 Electrical characteristics ST1S06XX Table 7. Electrical characteristics for ST1S06PM33 (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) Parameter Output feedback pin IO pin bias current Minimum input voltage Quiescent current Output current VO = 3.5V IO = 10mA to 1.5A VINH > 1.2V VINH < 0.4V, TJ = -30C to 85C VI = 4.2 to 5.5V Note 1 Device ON, VI = 4.2 to 5.5V 1.5 1.3 1.2 0.4 2 VI = 4.2V to 5.5V Note 1 IO = 10mA to 1.5A Note 1 VFB = 0.8V 1.2 80 ISW = 750 mA ISW = 750 mA Note 1 IO = 10mA to 100mA, VO = 3.3V IO = 100mA to 1.5A, VO = 3.3V Thermal shutdown Thermal shutdown hysteresis Load transient response Short circuit removal response IO = 100mA to 750mA, TJ = 25C tR = tF 200ns, Note 1 IO = 10mA to IO = short, TJ = 25C Note 1 -5 -10 65 % 85 130 90 150 15 +5 +10 C C %VO %VO 0.2 0.2 1.5 87 0.12 0.15 2.3 0.3 0.3 1.8 A %VO/ VI %VO/ IO MHz % A V 4.2 1.5 1 Test conditions Min. 3.23 Typ. 3.3 15 Max. 3.37 20 Unit V A V mA A A Symbol OUT IO VI IQ IO VINH Inhibit threshold Device ON, VI = 4.2 to 5V Device OFF IINH %VO/VI %VO/IO PWMfS DMAX RDSON-N RDSON-P ISWL TSHDN THYS %VO/IO %VO/IO Inhibit pin current Reference line regulation Reference load regulation PWM switching frequency Maximum duty cycle NMOS switch on resistance PMOS switch on resistance Switching current limitation Efficiency Note 1 Note: 1 Guaranteed by design, but not tested in production 8/20 ST1S06XX Typical performance characteristics 5 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 9/20 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 10/20 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 11/20 Typical performance characteristics ST1S06XX Figure 21. PMOS switch on resistance vs temperature Figure 22. Inhibit transient VI = 5V, VINH = 0 to 2V, IO = 1.5A Figure 23. Inhibit transient VI = 5V, VINH = 0 to 2V, IO = 10mA 12/20 ST1S06XX Typical application 6 Typical application Figure 24. Application circuit 13/20 Application notes ST1S06XX 7 Application notes The ST1S06 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 cycleby-cycle current limiting that provides protection against shorted outputs. Being the ST1S06 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 ST1S06 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 ST1S06XX Package mechanical data 8 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 15/20 Package mechanical data ST1S06XX DFN6D (3x3 mm) mechanical data mm. Dim. Min. A A1 A3 b D D2 E E2 e L 0.30 0.23 2.90 2.23 2.90 1.50 0.95 0.40 0.50 0.012 3.00 3.00 0.80 0 0.02 0.20 0.45 3.10 2.50 3.10 1.75 0.009 0.114 0.088 0.114 0.059 0.037 0.016 0.020 0.118 0.118 Typ. Max. 1.00 0.05 Min. 0.031 0 0.001 0.008 0.018 0.122 0.098 0.122 0.069 Typ. Max. 0.039 0.002 inch. 7946637B 16/20 ST1S06XX Package mechanical data Tape & Reel QFNxx/DFNxx (3x3) Mechanical Data mm. Dim. Min. A C D N T Ao Bo Ko Po P 3.3 3.3 1.1 4 8 12.8 20.2 60 18.4 0.130 0.130 0.043 0.157 0.315 Typ. Max. 330 13.2 0.504 0.795 2.362 0.724 Min. Typ. Max. 12.992 0.519 inch. 17/20 Package mechanical data ST1S06XX Figure 25. DFN6 (3x3 mm) footprint recommended data 18/20 ST1S06XX Revision history 9 Table 8. Date Revision history Document revision history Revision 1 2 3 4 5 6 7 Initial release. Table 3 updated. Add new mechanical data DFN6D. Mechanical data information for DFN6 update. Tape and reel updated. Added: Table 1 on page 1. Modified: Figure 6 on page 9. Changes 08-May-2006 06-Jun-2006 16-Oct-2006 09-Nov-2006 03-Apr-2007 12-Mar-2008 15-Apr-2008 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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