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| ST8R00 Micropower 1A synchronous step-up DC-DC converter Features Very low supply current: 500A (typ) Output voltage adjustable from 6V to 12V Output voltage accuracy: 2% Output current up to 1A Low ripple voltage: 5mV (typ) Synchronous rectification High 90% efficiency: VO = 9V (typ) Few external components Very small DFN8 (4x4mm) package ST8R00W, guarantees the lowest switching ripple when the device is used at light load conditions. The high switching frequency and internally limited peak inductor current permit the use of small, low-cost inductors. Only three external components are required: an inductor and two ceramic capacitors. The ST8R00 is suitable for use in equipment where low noise, low ripple and low supply current are required. The ST8R00 is available in a very small DFN8 4x4mm package. DFN8 4x4mm Description The ST8R00 family of low quiescent current, synchronous PWM step-up DC-DC converters offer high efficiency even in light load conditions. The ST8R00 accepts a positive input voltage from 4 to 6V and provides an output voltage in the 6 to 12V range. The ST8R00 is developed in two versions: Burst mode and Continuous mode. The Burst mode version functions in discontinuous mode, allowing the device to maintain the regulated voltage in no load conditions by turning off the internal switches. The Continuous mode version, Order codes Part number ST8R00 (1) Package ST8R00PUR ST8R00WPUR Output voltages ADJ ADJ ST8R00W (2) 1. Burst mode at light load 2. Full PWM mode May 2007 Rev. 1 1/19 www.st.com 19 ST8R00 Contents 1 2 3 4 5 6 7 8 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 ST8R00 Block diagram 1 Figure 1. Block diagram Schematic diagram LX Thermal OUT INH Inhibit PGND PWM Control IN VREF FB PGND GND 3/19 Pin configuration ST8R00 2 Figure 2. Pin configuration Pin connections (top view) Table 1. Pin n 1 2 3 4 5 6 7 8 EXP pad Pin description Symbol LX PGND GND IN FB INH HV OUT GND Switching output Power ground Analog ground Power input for analog circuit Feedback Inhibit. Connecting the pin to a voltage higher than 2V = device ON. Connecting the pin to a voltage lower than 0.8V = device OFF, resulting in no current flow to the load Trimming (floating or connected to GND) Output voltage Exposed pad. Must be connected to GND Name and function 4/19 ST8R00 Typical application circuit 3 Figure 3. Typical application circuit Application circuit VI L=4.7H IN INH LX OUT R1 VO ST8R00 CI=10F GND PGND FB R2 CO=10F 5/19 Maximum ratings ST8R00 4 Table 2. Symbol VO VI VINH VLX ILX TSTG TOP Maximum ratings Absolute maximum ratings Parameter Output voltage Input voltage Inhibit voltage LX pin voltage LX pin output current Storage temperature range Operating junction temperature range Value 16 6 6 16 Internally limited -50 to 150 -25 to 125 C C Unit V V V V Table 3. Symbol RthJC RthJA Thermal Data Parameter Thermal resistance junction-case Thermal resistance junction-ambient Value 10 50 Unit C/W C/W Table 4. Symbol ESD ESD ESD Performance Parameter ESD protection voltage ESD protection voltage HBM MM Test conditions Value 4 500 Unit KV V 6/19 ST8R00 Electrical characteristics 5 Table 5. Symbol VO Electrical characteristics Electrical characteristics for the ST8R00 (VI = 5V, VINH = 2V, IO = 100mA, TJ = -25C to 125C, CI = CO = 10F(X7R), L = 4.7H unless otherwise specified.) Parameter Output voltage (1) Test conditions Min. 6 Typ. Max. 12 Unit V V V V V nA A m VSTART-UP Start-up voltage VI VFB VFB_OFF IFB ISUPPLY Input voltage range Feedback voltage Feedback voltage Feedback current Supply current IO = 400mA, VI rising 4 IO = 50mA IO = 0, VINH = 0 VFB = 0, VINH = 2V To be measured at VI, no load ILX = 400mA ILX = 400mA VLX = 4V, VFB = 2V, VINH = 0 VLX = 4V To be measured on LX pin To be measured on LX pin IO = 100mA, VO = 9V 0.8 1.195 3 3.5 6 1.22 0 600 500 300 300 1.245 RDSON_N Internal N channel RDSON RDSON_P Internal P channel RDSON ILX(leak) ILX(LIM) fOSC DTY Internal leakage current LX current limitation Oscillator frequency Max. oscillator duty cycle 0.5 3 1.2 90 80 90 90 2 1.4 A A MHz % Eff Efficiency IO = 500mA, VO = 9V IO = 1A, VO = 9V % VINH_H VINH_L IINH TSHDN THYS VO/VI VO/IO VO/VI TSTART 1. Inhibit threshold high Inhibit threshold low Inhibit pin current Thermal shut down (2) Thermal shut down hysteresis (2) V VI = 4 to 6V, IO = 50mA VINH = VI = 5V 130 150 15 VI from 4 to 5.5V, IO = 500mA (2) VI = 5V, IO from 10mA to 500mA, VO = 7V (2) VI from 0 to 5V, IO = 500mA VINH from 0 to 5V, IO = 100mA -5 -5 -10 500 5 5 10 0.8 2 A C C %VO %VO %VO s Line transient response Load transient response Start-up transient Start-up time For VO higher than 9V the maximum output current capability is reduced according to LX current limitation 2. Guaranteed by design 7/19 Electrical characteristics ST8R00 Table 6. Symbol VO Electrical characteristics for the ST8R00W (VI = 5V, VINH = 2V, IO = 100mA, TJ = -25C to 125C, CI = CO = 10F(X7R), L = 4.7H unless otherwise specified.) Parameter Output voltage (1) Test conditions Min. 6 Typ. Max. 12 Unit V V V V V nA mA VSTART-UP Start-up voltage VI VFB VFB_OFF IFB ISUPPLY Input voltage range Feedback voltage Feedback voltage Feedback current Supply current IO = 400mA, VI rising 4 IO = 50mA IO = 0, VINH = 0 VFB = 0, VINH = 2V To be measured at VI, VO = 7V, no load ILX = 400mA ILX = 400mA VLX = 4V, VFB = 2V, VINH = 0 VLX = 4V To be measured on LX pin To be measured on LX pin IO = 50mA, VO = 7V 0.8 1.195 3 3.5 6 1.22 0 600 10 300 1.245 RDSON_N Internal N channel RDSON RDSON_P Internal P channel RDSON ILX(leak) ILX(LIM) fOSC DTY Internal leakage current LX current limitation Oscillator frequency Max. oscillator duty cycle m 300 0.5 3 1.2 90 85 90 90 2 V % 1.4 A A MHz % Eff Efficiency IO = 500mA, VO = 9V IO = 1A, VO = 9V VINH_H VINH_L IINH TSHDN THYS VO/VI VO/IO VO/VI TSTART Inhibit threshold high Inhibit threshold low Inhibit pin current Thermal shut down (2) (2) VI = 4 to 6V, IO = 50mA VINH = VI = 5V 130 150 15 VI from 4 to 5.5V, IO= 500mA (2) VI = 5V, IO from 10mA to 500mA, VO = 7V (2) VI from 0 to 5V, IO = 500mA VINH from 0 to 5V, IO = 100mA -5 -5 -10 500 0.8 2 A C C 5 5 10 %VO %VO %VO s Thermal shut down hysteresis Line transient response Load transient response Start-up transient Start-up time 1. For VO higher than 9V the maximum output current capability is reduced according to LX current limitation 2. Guaranteed by design 8/19 ST8R00 Typical characteristics 6 Figure 4. Typical characteristics (L = 4.7H, CI = CO = 10F) Voltage feedback vs temperature Figure 5. Feedback current vs temperature 1.3 1.28 1.26 1.24 1.22 1.2 1.18 1.16 1.14 1.12 1.1 -75 -50 -25 0 25 50 700 600 500 VI=5V, VINH=2V, No Inductor, No Bridge VFB [mV] IFB [nA] VI=VINH=5V, IO=50mA 400 300 200 100 0 -100 -75 -50 -25 0 25 50 75 100 125 150 175 75 100 125 150 175 T [C] T [C] Figure 6. Supply current vs temperature (for ST8R00W) Figure 7. Supply current vs temperature (for ST8R00W) 20 VI=VINH=5V, No Load 18 16 14 12 10 8 6 4 2 0 -75 -50 -25 0 25 50 20 ISUPPLY [mA] 15 10 5 VI=5,VINH=2V,No Load, VO@ 7V I SUPPLY [mA] @VO=7V 0 -75 -50 -25 0 25 50 T [C] 75 100 125 150 175 75 100 125 150 175 T [C] Figure 8. Supply current vs temperature (for ST8R00W) Figure 9. LX current limitation vs temperature 800 750 700 600 550 500 450 400 -75 VI=5V, VINH=GND, VFB=2V No resistors bridge and inductor directly to VI ILX [A] 650 4 3.5 3 2.5 2 1.5 1 0.5 0 -75 -50 -25 0 25 50 T [C] 75 ISUPPLY [A] VIN=VINH=5V, @VO<10% -50 -25 0 25 50 75 100 125 150 175 100 125 150 175 T [C] 9/19 Typical characteristics ST8R00 Figure 10. Inhibit voltage vs temperature Figure 11. Inhibit voltage vs temperature 3 2.5 VINH [V] 2 1.5 1 0.5 0 VI=4V, VINH from 0 to 2V, IO=50mA ON OFF 3 2.5 VINH [V] 2 1.5 1 0.5 0 -75 VI=6V, VINH from 0 to 2V, IO=50mA ON OFF -75 -50 -25 0 25 50 T [C] 75 100 125 150 175 -50 -25 0 25 50 T [C] 75 100 125 150 175 Figure 12. Line regulation vs temperature Figure 13. Load regulation vs temperature 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -75 VI= from 4V to 6V, IO=1A VO@9.5V 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -75 VI=5V, IO from 100mA to 1A LINE [%VO/ VI] LOAD [%VO/ IO] VO@9.5V -50 -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. Oscillator frequency vs temperature Figure 15. Max oscillator duty cycle vs temperature 1.7 1.5 1.3 1.1 0.9 0.7 0.5 -75 -50 -25 0 25 50 T [C] 75 100 125 150 175 Dutycycle MAX [%] PWM freq.[MHz] VI=VINH=5V, No Inductor, No Load 100 97.5 95 92.5 90 87.5 85 82.5 80 VI=VINH=5V, VFB=GND, No Inductor -75 -50 -25 0 25 50 T [C] 75 100 125 150 175 10/19 ST8R00 Typical characteristics Figure 16. Internal leakage current vs temperature Figure 17. Internal leakage current vs temperature 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 -75 0.6 0.5 ILX (leak)[uA] 0.4 0.3 0.2 0.1 0 -0.1 VI=5 , VINH=GND, VFB=2V, VLX=4V, No Inductor ILX (leak)[mA] VI=VINH=5V, VFB=2V, VLX=4V, No Inductor -50 -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 18. NMOS switch on resistance vs temperature Figure 19. PMOS switch on resistance vs temperature 500 VI=5V 500 VI=5V 400 400 RDSON-P [m ] 300 200 100 0 RDSON-N [m ] 300 200 100 0 -75 -50 -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. Efficiency vs output current (for ST8R00W) Figure 21. Efficiency vs output current (for ST8R00W) 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 0 100 200 VO@7V VI= VINH=5V, L=10H, IO= from 0A to 1A 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 0 100 200 Efficiency [%] Efficiency [%] VO@7V VI= VINH=5V, IO=from 0A to 1A 300 400 500 600 IO [mA] 700 800 900 1000 300 400 500 600 IO [mA] 700 800 900 1000 11/19 Typical characteristics ST8R00 Figure 22. Output voltage vs input voltage (for Figure 23. Maximum output current vs output ST8R00W) voltage 12.00 125C 1.1 1 0.9 25C 0C -25C 10.00 8.00 Pc os VI=VINH=5V t= 6W VO [V] 6.00 4.00 2.00 0.00 0 IO [A] 0.8 0.7 0.6 PMAX=6W OPERATIVE ZONE VI=VINH from 0 to 6V, IO=400mA 0.5 0.4 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.5 1 2 3 4 5 6 VI [V] VO [V] Figure 24. Efficiency vs output current 100 90 80 70 60 50 40 30 20 10 0 0 Figure 25. Efficiency vs input voltage 100 Efficiency [%] Efficiency [%] 90 80 70 60 50 40 3.5 VI=VINH= 5V, IO=100mA ST8R00 ST8R00W ST8R00 ST8R00W VI= VINH=5V, VO=9.5V 0.2 0.4 0.6 0.8 1 4 4.5 5 VI [V] 5.5 6 6.5 IO [A] Figure 26. Efficiency vs input voltage Figure 27. Inductor current (for ST8R00W) 100 Efficiency [%] 90 80 70 60 VI=VINH=5V, IO=500mA ST8R00 ST8R00W VLX 50 40 3.5 4 4.5 5 VI [V] ILX 5.5 6 6.5 VI=5V ,VINH= 2V, L=4.7H, CI=CO=10F, No Load, T=25C 12/19 ST8R00 Typical characteristics Figure 28. Load transient Figure 29. Line transient VI VO VO IO VI=VINH=5V, IO=from 10mA to 500mA VI=VINH from 4V to 5.5V, IO=500mA, 20s Figure 30. INH transient Figure 31. Inrush current VINH VO IO VI=6, VINH from 0V to 2V, IO=1A VI=4.5, VO=7V, VINH from 0V to 3V, IO=0, L=10H 13/19 Package mechanical data ST8R00 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 ST8R00 Package mechanical data DFN8 (4x4) Mechanical Data mm. Dim. Min. A A1 A3 b D D2 E E2 e L 0.40 0.23 3.90 2.82 3.90 2.05 0.80 0 Typ. 0.90 0.02 0.20 0.30 4.00 3.00 4.00 2.20 0.80 0.50 0.60 0.016 0.38 4.10 3.23 4.10 2.30 0.009 0.154 0.111 0.154 0.081 Max. 1.00 0.05 Min. 0.031 0 Typ. 0.035 0.001 0.008 0.012 0.157 0.118 0.157 0.087 0.031 0.020 0.024 0.015 0.161 0.127 0.161 0.091 Max. 0.039 0.002 inch. 7869653B 15/19 Package mechanical data ST8R00 Figure 32. DFN8 (4x4) Footprint Recommended Data 16/19 ST8R00 Package mechanical data Tape & Reel QFNxx/DFNxx (4x4) Mechanical Data mm. Dim. Min. A C D N T Ao Bo Ko Po P 4.35 4.35 1.1 4 8 12.8 20.2 99 101 14.4 0.171 0.171 0.043 0.157 0.315 Typ. Max. 330 13.2 0.504 0.795 3.898 3.976 0.567 Min. Typ. Max. 12.992 0.519 inch. 17/19 Revision history ST8R00 8 Table 7. Date Revision history Revision history Revision 1 Initial release. Changes 23-May-2007 18/19 ST8R00 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. 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