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| ST1S06 Synchronous rectification with inhibit, 1.5A, 1.5 MHz fixed or adjustable, step-down switching regulator in DFN6 3x3 General features Step-down current mode PWM (1.5MHz) DCDC converter 2% DC output voltage tolerance Synchronous rectification Inhibit function Internal soft start Typical efficiency:> 90% 1.5A Output current capability Not switching quiescent current: max 1.5mA over temperature range RDS ON typ150m Uses tiny capacitors and inductors Operative junction temp. -30C to 125C Available in DFN6 3x3 exposed pad high current linear solution when the power dissipation may cause an high heating of the application environment. It provides up to 1.5A over an input voltage range of 2.7V to 6V. An high switching frequency (1.5MHz) 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 E.S.R. SMD ceramic capacitors. The device is thermal protected and current limited to prevent damages due to accidental short circuit. The ST1S06 is available in DFN6 3x3 package. DFN6 (3x3mm) 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 Order code Part number ST1S06PM ST1S06PU ST1S06APM ST1S06PM12 ST1S06PM33 ST1S06APU ST1S06PU12 ST1S06PU33 April 2007 Packaging ST1S06PMR ST1S06PUR ST1S06APMR ST1S06PM12R ST1S06PM33R ST1S06APUR ST1S06PU12R ST1S06PU33R Rev. 5 Package DFN6 (3x3 mm) DFN6D (3x3 mm) DFN6 (3x3 mm) DFN6 (3x3 mm) DFN6 (3x3 mm) DFN6D (3x3 mm) DFN6D (3x3 mm) DFN6D (3x3 mm) 1/19 www.st.com 19 Contents ST1S06 Contents 1 2 3 4 5 6 7 8 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 ST1S06 Diagram 1 Figure 1. Diagram Schematic diagram 3/19 Pin configuration ST1S06 2 Figure 2. Pin configuration Pin configuration (top view) ST1S06 ST1S06A Note: Table 1. Pln 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 4/19 ST1S06 Maximum ratings 3 Table 2. 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 > 1.6V) 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 Symbol VIN_SW VIN_A VINH SWITCH Voltage VFB/VO VO TJ TSTG TLEAD 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 3. Symbol RthJA RthJC 5/19 Electrical characteristics ST1S06 4 Table 4. Electrical characteristics Electrical characteristics for ST1S06 (VIN_SW =VIN_A =VINH =5V, VO=1.2V, CI =4.7F, CO =22F, L1 =3.3H, TJ =-30 to 125C (unless otherwise specified. Typical values are referred to TJ = 25C) Symbol FB IFB VI IQ IO VINH IINH %VO/VI %VO/IO PWMfS DMAX Parameter Feedback voltage VFB pin bias current Minimum input voltage Quiescent current Output current Inhibit threshold Inhibit pin current Reference line regulation Reference load regulation PWM Switching frequency Test conditions Min. 784 Typ. 800 Max. 816 600 1.5 1 Unit mV nA V mA A A V 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 Device ON, VI = 2.7 to 5V Device OFF 2.7 1.5 1.3 1.2 0.4 2 0.2 0.2 1.2 80 1.5 87 0.12 0.15 2.3 65 85 130 90 150 15 0.3 0.3 1.8 VI = 2.7V to 5.5V Note: 1 IO = 10mA to 1.5A Note: 1 VFB = 0.8V ISW = 750 mA ISW = 750 mA A %VO/ VI %VO/ IO MHz % A % C C Maximum duty cycle RDSON-N NMOS Switch on resistance RDSON-P PMOS Switch on resistance ISWL TSHDN THYS %VO/IO %VO/IO Switching current limitation Efficiency Note: 1 Thermal shutdown Thermal shutdown hysteresis Load transient response Short circuit removal response Note: 1 IO = 10mA to 100mA, VO = 3.3V IO = 100mA to 1.5A, VO = 3.3V IO = 100mA to 750mA, TJ = 25C tR = tF 200ns, Note: 1 IO = 10mA to IO=short, TJ = 25C Note: 1 -5 -10 +5 +10 %VO %VO Note: 1 Guaranteed by design, but not tested in production 6/19 ST1S06 Table 5. Electrical characteristics for ST1S06PM12 Electrical characteristics (VIN_SW =VIN_A =VINH =5V, VO=1.2V, CI =4.7F, CO =22F, L1 =3.3H, TJ =-30 to 125C unless otherwise specified. Typical values are referred to TJ =25C) Symbol OUT IO VI IQ IO VINH IINH %VO/VI %VO/IO PWMfS Parameter Output feedback pin IO Pin bias current Minimum input voltage Quiescent current Output current Inhibit threshold Inhibit pin current Reference line regulation Reference load regulation PWM Switching frequency VI = 2.7V to 5.5V Note: 1 IO = 10mA to 1.5A Note: 1 VFB = 0.8V ISW = 750 mA ISW = 750 mA 1.2 80 0.2 0.2 1.5 87 0.12 0.15 2.3 60 80 130 IO = 100mA to 750mA, TJ = 25C tR = tF 200ns, Note: 1 IO = 10mA to IO=short, TJ = 25C Note: 1 85 150 15 -5 -10 +5 +10 Test conditions 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 Device ON, VI = 2.7 to 5V Device OFF 1.5 1.3 1.2 0.4 2 0.3 0.3 1.8 V A %VO/ VI %VO/ IO MHz % A % C C %VO %VO 2.7 1.5 1 Min. 1.176 Typ. 1.2 15 Max. 1.224 20 Unit V A V mA A A DMAX Maximum duty cycle RDSON-N NMOS Switch on resistance RDSON-P PMOS Switch on resistance ISWL TSHDN THYS %VO/IO %VO/IO Switching current limitation Efficiency Note: 1 Thermal shutdown Thermal shutdown hysteresis Load transient response Short circuit removal response Note: 1 IO = 10mA to 100mA, VO = 1.2V IO = 100mA to 1.5A, VO = 1.2V Note: 1 Guaranteed by design, but not tested in production 7/19 Electrical characteristics ST1S06 Table 6. Electrical characteristics for ST1S06PM33 (VIN_SW =VIN_A =VINH =5V, VO=3.3V, CI =4.7F, CO =22F, L1 =3.3H, TJ =-30 to 125C unless otherwise specified. Typical values are referred to TJ =25C) Symbol OUT IO VI IQ IO VINH IINH %VO/VI %VO/IO PWMfS Parameter Output feedback pin IO Pin bias current Minimum input voltage Quiescent current Output current Inhibit threshold Inhibit pin current Reference line regulation Reference load regulation PWM Switching frequency Test conditions 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 Device ON, VI = 4.2 to 5V Device OFF Min. 3.23 4.2 Typ. 3.3 15 Max. 3.37 20 1.5 1 Unit V A V mA A A V 1.5 1.3 1.2 0.4 2 0.2 0.2 1.2 80 1.5 87 0.12 0.15 2.3 65 85 130 90 150 15 0.3 0.3 1.8 VI = 4.2V to 5.5V Note: 1 IO = 10mA to 1.5A Note: 1 VFB = 0.8V ISW = 750 mA ISW = 750 mA A %VO/ VI %VO/ IO MHz % A % C C DMAX Maximum duty cycle RDSON-N NMOS Switch on resistance RDSON-P PMOS Switch on resistance ISWL TSHDN THYS %VO/IO %VO/IO Switching current limitation Efficiency Note: 1 Thermal shutdown Thermal shutdown hysteresis Load transient response Short circuit removal response Note: 1 IO = 10mA to 100mA, VO = 3.3V IO = 100mA to 1.5A, VO = 3.3V IO = 100mA to 750mA, TJ = 25C tR = tF 200ns, Note: 1 IO = 10mA to IO=short, TJ = 25C Note: 1 -5 -10 +5 +10 %VO %VO Note: 1 Guaranteed by design, but not tested in production 8/19 ST1S06 Typical performance characteristics 5 Typical performance characteristics (VIN_SW =VIN_A =VINH =5V, CI = 4.7F, CO = 22F, L1 =3.3H, unless otherwise specified. Typical values are referred to 25C) 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 9/19 Typical performance characteristics ST1S06 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 10/19 ST1S06 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 11/19 Typical performance characteristics ST1S06 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 12/19 ST1S06 Typical application 6 Typical application Figure 24. Application circuit Application notes The ST1S06 is an adjustable current mode PWM step-down DC/DC converter with internal 1.5A power switch, packaged in a 6-lead DFN 3x3. It's a complete 1.5A 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 250mA 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=100s 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 150C 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. 13/19 Package mechanical data ST1S06 7 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. 14/19 ST1S06 Package mechanical data DFN6 (3x3) MECHANICAL DATA mm. DIM. MIN. A A1 A2 A3 b D D2 E E2 e L L1 L2 K 0.20 0.20 0.24 0.13 0.008 0.33 2.90 1.92 2.90 1.11 0.95 0.45 0.008 0.009 0.005 3.00 3.00 0.80 0 0.65 0.20 0.43 3.10 2.12 3.10 1.31 0.013 0.114 0.076 0.114 0.044 0.037 0.018 0.118 0.118 TYP MAX. 1.00 0.05 0.75 MIN. 0.031 0.0 0.026 0.08 0.017 0.122 0.083 0.122 0.052 TYP. MAX. 0.039 0.02 0.030 inch. 7387339A 15/19 Package mechanical data ST1S06 DFN6D (3x3) 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 16/19 ST1S06 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 17/19 Revision history ST1S06 8 Table 7. Revision history Revision history Revision 1 2 3 4 5 Initial release. Changes Date 08-May-2006 06-Jun-2006 16-Oct-2006 09-Nov-2006 03-Apr-2007 Table 2. has been updated. Add new mechanical data DFN6D. Mechanical data information for DFN6 has been update. Tape & Reel has been updated. 18/19 ST1S06 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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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