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| ST1S12xx Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L Features Step-down current mode PWM (1.7 MHz) DCDC converter 3% DC output voltage tolerance Synchronous rectification Fixed output voltage 1.2 V, 1.8 V, and ADJ (available on request 1.5 V, 2.5 V and 3.3 V) Enable function Internal soft start Typical efficiency: > 90% 0.7 A output current capability Not switching quiescent current: max 600 A over temperature range RDSON typ. 250 m and 400 m Uses tiny capacitors and inductors Operative junction temp. -40C to 125C Available in TSOT23-5L package 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 thermally protected and the current is limited to prevent damage due to accidental short-circuit. The ST1S12Gxx is available in the TSOT23-5L package. TSOT23-5L Description The ST1S12Gxx is a step down DC-DC converter optimized for powering low-voltage digital cores in HDD applications and, generally, to replace the high current linear solution when the power dissipation may cause high heating of the application environment. It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency (1.7 MHz) allows 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 Table 1. Device summary Part numbers ST1S12XX ST1S12XX12 ST1S12XX18 1. Available on request. Order codes ST1S12GR ST1S12G12R ST1S12G18R (1) Package TSOT23-5L TSOT23-5L TSOT23-5L February 2008 Rev 2 1/20 www.st.com 20 Contents ST1S12xx Contents 1 2 3 4 5 6 7 8 9 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 ST1S12xx Schematic 1 Figure 1. Schematic Schematic diagram VIN UVLO VSUM Comp VRST VSET MOSFET CONTROL LOGIC VDRV_P Driver OSC VC DMD SHUT DOWN VDRV_N Driver SOFT START REF1 FB/VO EN - DMD + - I_SEN + Rsense SW gm + - Gnd 3/20 Pin configuration ST1S12xx 2 Figure 2. Pin configuration Pin connections (top view) Table 2. Pin n 1 2 3 4 5 Pin description Symbol EN GND SW VIN FB/VO Enable pin System ground Switching pin Input supply pin Feedback voltage / or output voltage Name and function 4/20 ST1S12xx Maximum ratings 3 Table 3. Maximum ratings Absolute maximum ratings Parameter Positive power supply voltage Enable 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 VIN + 0.3 -0.3 to VIN + 0.3 -0.3 to 3 -0.3 to 6 -40 to 150 -65 to 150 260 Unit V V V V V C C C Symbol VIN VEN SWITCH Voltage VFB/VO VO TJ TSTG TLEAD Note: Absolute maximum ratings are the 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 220 110 Unit C/W C/W Table 4. Symbol RthJA RthJC Table 5. Symbol ESD ESD performance Parameter ESD protection voltage MM 0.3 kV Test conditions HBM Value 2 Unit kV 5/20 Electrical characteristics ST1S12xx 4 Table 6. Electrical characteristics Electrical characteristics for ST1S12G VIN =VEN = 3.6 V, CIN = 4.7 F, CO =10 F, L = 2.2 H, TJ = -40 to 125 C (unless otherwise specified. Typical values are referred to 25 C) Parameter Feedback voltage VFB pin bias current Minimum input voltage Quiescent current Output current Enable threshold Enable pin current VIN = 2.5V to 5.5V Note 1 IO = 10mA to 700mA Note 1 1.16 0.05 IO= 10mA to 0.7A VIN =VEN, VFB=0.65V VEN = 0, T = -40C to 85C VIN = 2.5 to 5.5V Note 1 Device ON, VIN = 2.5 to 5.5V Device OFF 0.7 1.5 V 0.5 1 0.1 A %VO/VIN %VO/mA MHz % A % 90 130 150 15 IO = 100mA to 700mA, TA = 25C tR = tF 200ns, CO=22F Note 1 IO = 10mA to IO=short, TA = 25C Note 1 -5 -10 +5 +10 C C %VO %VO Test conditions TJ =-40 to 125C Min. 582 -50 2.5 500 600 1 Typ. 600 Max. 618 50 Unit V nA V A A A Symbol FB IFB VIN IQ IO VEN IEN %VO/VIN Reference line regulation %VO/IO PWMfS DMAX Reference load regulation PWM switching frequency Maximum duty cycle 0.0025 0.005 1.7 2.08 100 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 ISW = 100 mA ISW = 100 mA Note 1 IO = 10mA to 100mA, VO = 1.8V IO = 100mA to 0.7A, VO = 1.8V 0.25 0.25 1.6 80 0.4 0.45 Note: 1 Guaranteed by design, but not tested in production. 6/20 ST1S12xx Electrical characteristics Table 7. Electrical characteristics for ST1S12G12 VIN =VEN = 3 V, CIN = 4.7 F, CO =10 F, L = 2.2 H, TJ = -40 to 125 C (unless otherwise specified. Typical values are referred to 25 C) Parameter Output feedback pin VO pin bias current Minimum input voltage Quiescent current Output current Enable threshold Enable pin current VIN = 2.5V to 5.5V Note 1 IO = 10mA to 700mA Note 1 1.16 ISW = 100 mA ISW = 100 mA Note 1 IO = 10mA to 100mA IO = 100mA to 0.7A Thermal shutdown Thermal shutdown hysteresis Load transient response Short circuit removal response IO = 100mA to 700mA, TA = 25C tR = tF 200ns, CO=22F Note 1 IO = 10mA to IO=short, TA = 25C Note 1 -5 -10 130 0.05 IO= 10mA to 0.7A VIN =VEN, VFB=1.5V VEN = 0, T = -40C to 85C VIN = 2.5 to 5.5V Note 1 Device ON, VIN = 2.5 to 5.5V Device OFF 0.7 1.5 V 0.5 1 0.1 A %VO/VIN %VO/mA MHz A % 85 150 15 +5 +10 C C %VO %VO 2.5 500 600 1 Test conditions TJ =-40 to 125C Min. 1.164 Typ. 1.2 15 Max. 1.236 20 Unit V A V A A A Symbol OUT IO VIN IQ IO VEN IEN %VO/VIN Reference line regulation %VO/IO PWMfS Reference load regulation PWM switching frequency 0.0025 0.005 1.7 0.25 0.25 1.6 80 2.08 0.4 0.45 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 Note: 1 Guaranteed by design, but not tested in production. 7/20 Electrical characteristics ST1S12xx Table 8. Electrical characteristics for ST1S12G18 VIN =VEN = 3.6 V, CIN = 4.7 F, CO =10 F, L = 2.2 H, TJ = -40 to 125 C (unless otherwise specified. Typical values are referred to 25 C) Parameter Output feedback pin VO pin bias current Minimum input voltage Quiescent current Output current Enable threshold Enable pin current VIN = 2.5V to 5.5V Note 1 IO = 10mA to 700mA Note 1 1.16 ISW = 100 mA ISW = 100 mA Note 1 IO = 10mA to 100mA IO = 100mA to 0.7A Thermal shutdown Thermal shutdown hysteresis Load transient response Short circuit removal response IO = 100mA to 700mA, TA = 25C tR = tF 200ns, CO=22F Note 1 IO = 10mA to IO=short, TA = 25C Note 1 -5 -10 130 0.05 IO= 10mA to 0.7A VIN =VEN, VFB=2V VEN = 0, T = -40C to 85C VIN = 2.5 to 5.5V Note 1 Device ON, VI = 2.5 to 5.5V Device OFF 0.7 1.5 V 0.5 1 0.1 A %VO/VIN %VO/mA MHz A % 90 150 15 +5 +10 C C %VO %VO 2.5 500 600 1 Test conditions TJ =-40 to 125C Min. 1.746 Typ. 1.8 15 Max. 1.854 20 Unit V A V A A A Symbol OUT IO VIN IQ IO VEN IEN %VO/VIN Reference line regulation %VO/IO PWMfS Reference load regulation PWM switching frequency 0.0025 0.005 1.7 0.25 0.25 1.6 80 2.08 0.4 0.45 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 Note: 1 Guaranteed by design, but not tested in production. 8/20 ST1S12xx Typical application 5 Figure 3. Typical application Application circuit 9/20 Application notes ST1S12xx 6 Application notes The ST1S12Gxx is an adjustable current mode PWM step-down DC-DC converter with internal 0.7 A power switch, packaged in TSOT23-5L. This device is a complete 0.7 A switching regulator, with its internal compensation eliminating the need for additional components. Because the ST1S12Gxx an adjustable regulator, the output voltage is determined by an external resistor divider. The desired value is derived by the following equation: VO = VFB[1+R1/R2] For the device to function only a few component are required: an inductor, two capacitors and the resistor divider. The inductor selected must be capable of non saturation at peak current level. Moreover, its value can be selected taking into account that a large inductor value increases efficiency at low output current and reduces output voltage ripple, while a smaller inductor can be used when it is important to reduce package size and the total cost of the application. Finally, the ST1S12Gxx has been designed to work properly with X5R or X7R SMD ceramic capacitors both at the input and at the output. These types of capacitors, due 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 compromising the correct functioning of the device. 10/20 ST1S12xx Typical performance characteristics 7 Typical performance characteristics Unless otherwise specified, refer to the typical application circuit under the following conditions: CIN = 4.7 F, COUT = 10 F, L = 2.2 H Voltage feedback vs temperature Figure 5. Drop vs temperature Figure 4. 650 VIN=VEN=3.6V, IOUT=10mA, VOUT=1.8V 0.5 IOUT=700mA, VOUT=2.7V, Duty cycle=100% 630 VFB [mV] 610 590 570 550 -75 -50 -25 0 25 50 T [C] 75 100 125 150 175 Drop [V] 0.4 0.3 0.2 0.1 0 -75 -50 -25 0 25 50 T [C] 75 100 125 150 175 Figure 6. Oscillator frequency vs temperature Figure 7. Efficiency vs output current 2.3 PWM freq.[MHz] 2.1 1.9 1.7 1.5 1.3 1.1 -75 -50 -25 0 25 50 T [C] 75 100 125 150 175 VIN=VEN=3.6V, VFB=0.65V, VOUT=1.8V 100 90 80 70 60 50 40 30 20 10 0 0 0.1 Efficiency [%] VIN=VEN=3V, IOUT=from 10mA to 700mA, VOUT=1.2V 0.2 0.3 0.4 IOUT [A] 0.5 0.6 0.7 0.8 Figure 8. Efficiency vs output current Figure 9. Efficiency vs temperature 100 90 80 70 60 50 40 30 20 10 0 0 0.1 VIN=VEN=3.6V, IOUT=from 10mA to 700mA, VOUT=1.8V 100 90 80 70 60 50 40 30 20 10 0 -75 -50 -25 0 25 50 T [C] IOUT=100mA IOUT=700mA Efficiency [%] Efficiency [%] VIN=VEN=3.6V, VOUT=1.8V 0.2 0.3 0.4 IOUT [A] 0.5 0.6 0.7 75 100 125 150 175 11/20 Typical performance characteristics ST1S12xx Figure 10. Efficiency vs temperature Figure 11. Supply current vs temperature 100 90 80 70 60 50 40 30 20 10 0 -75 -50 IOUT=100mA 8 7 ISUPPLY [mA] 6 5 4 3 2 1 -75 -50 -25 VIN=VEN=3V, VOUT=1.2V, No Load Efficiency [%] IOUT=700mA VIN=VEN=3V, VOUT=1.2V -25 0 25 50 T [C] 75 100 125 150 175 0 25 50 T [C] 75 100 125 150 175 Figure 12. Quiescent current vs temperature Figure 13. Enable voltage vs temperature 510 490 470 450 430 410 390 370 350 -75 -50 VIN=VEN=3.6V, VFB=0.65V, CIN=COUT=10F, No Switching 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -75 ISUPPLY [A] ON OFF VEN [V] VIN=2.5V, IOUT=10mA, CIN=COUT=10F, VOUT=1.8V -25 0 25 50 T [C] 75 100 125 150 175 -50 -25 0 25 50 T [C] 75 100 125 150 175 Figure 14. Enable voltage vs temperature Figure 15. Reference line regulation vs temperature 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -75 -50 0.6 LINE [%VOUT/ VIN] ON OFF 0.4 0.2 -0 -0.2 -0.4 -0.6 -75 VIN=VEN= 2.5V to 5.5V, CIN=COUT=10F, IOUT=10mA, VOUT=1.8V VEN [V] VIN=5.5V, IOUT=10mA, CIN= COUT=10F, VOUT=1.8V -25 0 25 50 T [C] 75 100 125 150 175 -50 -25 0 25 50 T [C] 75 100 125 150 175 12/20 ST1S12xx Typical performance characteristics Figure 16. Reference load regulation vs temperature Figure 17. NMOS switch on resistance vs temperature 0.005 LOAD [%VOUT/mA] VIN=3.6V, IOUT from 10mA to 0.7A, VOUT=1.8V 0.7 0.6 RDSON-N [ohm] 0.5 0.4 0.3 0.2 0.1 0 -75 -50 -25 VIN=VEN=3.6V, CIN=COUT=10F, VOUT=1.2V 0.004 0.003 0.002 0.001 0 -75 -50 -25 0 25 50 T [C] 75 100 125 150 175 0 25 50 T [C] 75 100 125 150 175 Figure 18. PMOS switch on resistance vs temperature Figure 19. Switching current limitation vs temperature 0.7 0.6 RDSON-P [ohm] 0.5 0.4 0.3 0.2 0.1 0 -75 -50 VIN=VEN=3.6V, CIN=COUT=10F, VOUT=1.2V 2.6 2.3 2 ISW [A] 1.7 1.4 1.1 0.8 0.5 VIN=VEN=3.6V, CIN=COUT=10F, VOUT=1.8V -25 0 25 50 T [C] 75 100 125 150 175 -75 -50 -25 0 25 50 T [C] 75 100 125 150 175 Figure 20. Switching current limitation vs input voltage Figure 21. Output voltage vs input voltage 3 2.5 ISW [A] 2 1.5 1 0.5 0 2 2.5 3 3.5 4 VIN [V] 4.5 5 5.5 6 VIN=VEN from 2.5 to 5.5V, CIN=COUT=10F, VOUT=1.8V 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 1 2 VIN=VEN from 0 to 5.5V, IOUT=700mA, CIN=COUT=10F 125C 25C 0C -25C -40C VOUT [V] 3 4 5 6 VIN [V] 13/20 Typical performance characteristics ST1S12xx Figure 22. Line transient Figure 23. Load transient VOUT VIN VOUT IOUT VIN = VEN from 4.5 V to 5.5 V, IOUT = 350 mA, CIN = COUT = 10F, VOUT = 1.8 V VIN = VEN = 3 V, IOUT = 100 mA to 700 mA, tR = tF = 200 ns Figure 24. Start-up transient Figure 25. Enable transient VIN VEN VOUT VOUT VIN = VEN from 0 V to 6 V, IOUT = 350 mA, CIN = COUT = 10F, VOUT = 1.8 V VIN =3.6, VEN from 0 V to 2 V, IOUT = 350 mA, CIN = COUT = 10F, VOUT = 1.8 V 14/20 ST1S12xx 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 ST1S12xx TSOT23-5L mechanical data mm. Dim. Min. A A1 A2 b C D E E1 e e1 L 0.3 0 0.7 0.3 0.08 2.9 2.8 1.6 0.95 1.9 0.6 11.8 Typ. Max. 1.1 0.1 1.0 0.5 0.2 27.6 11.8 3.1 114.2 110.2 63.0 37.4 74.8 23.6 Min. Typ. Max. 43.3 3.9 39.4 19.7 7.9 mils. 7282780B 16/20 ST1S12xx Package mechanical data Tape & reel TSOT23-5L mechanical data mm. Dim. Min. A C D N T Ao Bo Ko Po P 3.13 3.07 1.27 3.9 3.9 3.23 3.17 1.37 4.0 4.0 12.8 20.2 60 14.4 3.33 3.27 1.47 4.1 4.1 0.123 0.120 0.050 0.153 0.153 0.127 0.124 0.054 0.157 0.157 13.0 Typ. Max. 180 13.2 0.504 0.795 2.362 0.567 0.131 0.128 0.0.58 0.161 0.161 0.512 Min. Typ. Max. 7.086 0.519 inch. 17/20 Package mechanical data ST1S12xx Figure 26. TSOT23-5L footprint recommended data Table 9. Footprint data Values mm. A B C D E F 3.50 1.10 0.60 0.95 1.20 2.30 inch. 0.138 0.043 0.024 0.037 0.047 0.090 18/20 ST1S12xx Revision history 9 Table 10. Date Revision history Document revision history Revision 1 2 Initial release. Modified: Figure 3 on page 9. Changes 10-Jan-2008 01-Feb-2008 19/20 ST1S12xx 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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