ST662AB ST662AC DC-DC converter from 5V to 12V, 0.03A for flash memory programming supply Features ■ Output voltage: 12V ± 5% ■ Supply voltage range: 4.5V to 5.5V ■ Guaranteed output current up to 30mA ■ Very low quiescent current: 100mA ■ Logic controlled electronic shutdown: 1µA ■ Just capacitors needed (no inductor) DIP-8 Description SO-8 The ST662A is a regulated charge pump DC-DC converter. It provides 12V ± 5% output voltage to program byte-wide flash memory, and can supply 30mA output current from input as low as 4.75V. A logic controlled shut down pin that interfaces directly with microprocessor reduces the supply current to only 1µA. Table 1. Device summary Packages Order codes DIP-8 ST662AB ST662AC July 2007 SO-8 (tape & reel) ST662ABD-TR ST662ACN Rev. 5 ST662ACD-TR 1/20 www.st.com 20 ST662AB - ST662AC Contents 1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.1 ST662A output performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 How to increase output current or output voltage capability . . . . . . . 13 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 ST662AB - ST662AC 1 Application circuit Figure 1. Typical application circuit Application circuit 3/20 Pin configuration ST662AB - ST662AC 2 Pin configuration Figure 2. Pin connections (top view) Table 2. Pin description Pin N° Symbol 1 C1- Negative terminal for the first charge pump capacitor 2 C1+ Positive terminal for the first charge pump capacitor 3 C2- Negative terminal for the second charge pump capacitor 4 C2+ Positive terminal for the second charge pump capacitor 5 VCC Supply voltage 6 VOUT 12V output voltage VOUT = VCC when in shutdown mode 7 GND Ground 8 SHDN 4/20 Name and function Active high C-MOS logic level shutdown input. SHDN is internally pulled up to VCC. Connect to GND for normal operation. In Shutdown mode the charge pumps are turned off and VOUT = VCC ST662AB - ST662AC Maximum ratings 3 Maximum ratings Table 3. Absolute maximum ratings Symbol Value Unit -0.3 to 6 V -0.3 to (VCC + 0.3) V Output current continuous 50 A PTOT Power dissipation 500 mW TOP Operating ambient temperature range TSTG Storage temperature range VCC SHDN IO Parameter DC input voltage to GND Shutdown voltage AC SERIES 0 to 70 AB SERIES -40 to 85 °C -40 to 150 °C Note: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 4. Thermal data Symbol RthJC Parameter Thermal resistance junction-case SO-8 Unit 20 °C/W 5/20 Electrical characteristics ST662AB - ST662AC 4 Electrical characteristics Table 5. Electrical characteristics (Refer to the test circuits, VCC = 4.5V to 5.5V, TA = TMIN to TMAX, unless otherwise specified. Typical value are referred at TA = 25°C) Symbol Parameter Test conditions Min. Typ. Max. Unit IO = 0 to 20 mA 11.4 12 12.6 IO = 0 to 30 mA, VCC = 4.75 to 5.5 V 11.4 12 12.6 100 500 µA 1 10 µA -12 -5 µA VO Output voltage IQ1 Quiescent current NO LOAD, VSHDN = 0 IQ2 Shutdown current NO LOAD, VSHDN = VCC ISH Shutdown pin current VIL Shutdown input low threshold VIH Shutdown input high threshold fO Oscillator frequency VCC = 5 V, IO = 30 mA 400 KHz n Power efficiency VCC = 5 V, IO = 30 mA 72 % RSW 6/20 VSHDN = 0, VCC = 5V V -50 VSHDN = VCC = 5V 0 µA 0.4 2.4 VCC - VOUT switch impedance VSHDN = VCC = 5V, IO = 100 µA V V 1 2 KΩ ST662AB - ST662AC Typical performance characteristics 5 Typical performance characteristics Figure 3. Output voltage vs temperature Figure 4. Output voltage vs temperature Figure 5. Supply current vs temperature Figure 6. Supply current vs supply voltage Figure 7. SHDN pin current vs temperature Figure 8. Output voltage vs shutdown input 7/20 Typical performance characteristics Figure 9. Output voltage vs shutdown input voltage Figure 11. Test circuit 8/20 ST662AB - ST662AC Figure 10. Output voltage vs shutdown input voltage ST662AB - ST662AC 6 Description Description The ST662 is an IC developed to provide a 12V regulated output 30mA from voltage input as low as 4.75 without any inductors. It is useful for a wide range of applications and its performances makes it ideal for flash memory programming supply. An evaluation kit is provided to facilitate the application. This include a single-side demo board designed for surface-mount components.The operating principle of ST662 (see Figure 12.) is to charge C1 and C2 capacitor by closing the S1 switch (while S2 is opened) at the VCC voltage. After S1 will be opened and S2 closed so that C1 and C2 capacitors are placed in series one to each other, and both are in series with VIN. The sum of VC1 and VC2 and VI is applied to the capacitor C4. This works as voltage triple. An amplifier error checks the output voltage and blocks the oscillator if the output voltage is greater than 12V. The shutdown pin is internally pulled to VCC. When it is held low the output voltage rises to +12V. Figure 13. shows the transition time of the shut down pin when the VSHDN goes from 5V to 0V. Input logic levels of this input are CMOS compatible Applying a logic high at this input, the VOUT oscillator will be blocked and the VOUT will reach the VI value by D1. In this condition ICC will be. low as 1µA. The Figure 14. shows the transition time of the shut down pin when the VSHDN goes from 0V to 5V. Figure 12. Operating principle circuit 9/20 Description ST662AB - ST662AC Figure 13. Exiting shutdown Figure 14. Entering shutdown VCC = 5 V, IOUT = 200 µA VCC = 5 V, IOUT = 200 µA 10/20 ST662AB - ST662AC 7 Application circuit Application circuit Based on fast charge/discharge of capacitors, this circuit involves high di/dt values limited only by RON of switches. This implies a critical layout design due to the need to minimize inductive paths and place capacitors as close as possible to the device. A good layout design is strongly recommended for noise reason. For best performance, use very short connections to the capacitors and the values shown in Table 6. C3 and C4 must have low ESR in order to minimize the output ripple. Their values can be reduced to 2µF and 1µF, respectively, when using ceramic capacitors, but must be of 10µF or larger if aluminium electrolytic are chosen. C5 must be placed as close to the device as possible and could be omitted if very low output noise performance are not required. Figure 15. and Figure 16. show, respectively, our EVALUATION kit layout and the relatively. Figure 15. KIT Lay-out Figure 16. Electrical schematic 11/20 Application circuit Table 6. 7.1 ST662AB - ST662AC List of component Capacitor Type Value (µF) Charge Pump C1 Ceramic 0.22 Charge Pump C1 Ceramic 0.22 Input C3 Electrolytic Tantalum 4.7 Output C4 Electrolytic Tantalum 4.7 Decoupling C5 Ceramic 0.1 ST662A output performance Figure 17. Output voltage vs output current Figure 18. Efficiency vs output current Figure 19. Load transient response Figure 20. Load transient response VCC = 5 V, IOUT = 0 to 30mA VCC = 4.5 to 5.5V, IOUT = 30 mA 12/20 ST662AB - ST662AC 8 How to increase output current or output voltage capability How to increase output current or output voltage capability Current capability is limited by RON of internal switches. It is possible to increase it connecting in parallel two or more ST662A devices; each one of them can supply 30mA. The Figure 19. shows the electric schematic. The capacitors C3, C4 and C5 must be placed very close to the ICs on the board. If this is not possible, you can place two different capacitors, each of them of half value, very close to the respective integrated circuit. Figure 23. show the Output Current capability of the proposed circuit. If an output voltage greater than 12V is required, it’s possible to realize the circuit of the following diagram Figure 22. The relevant Output Current capability is shown in Figure 24. in which is shown the output voltage vs load current. Figure 21. Application circuit for two ST662A in parallel Table 7. List of component Capacitor Type Value (µF) C1A Ceramic 0.22 C2A Ceramic 0.22 C1B Ceramic 0.22 C2B Ceramic 0.22 C3 Electrolytic Tantalum 10 C4 Electrolytic Tantalum 10 C5 Ceramic 0.22 13/20 How to increase output current or output voltage capability ST662AB - ST662AC Figure 22. Application circuit for output voltage greater than 12V Figure 23. Output voltage for the application with two device in parallel 14/20 Figure 24. Output voltage for application with output voltage greater than 12V ST662AB - ST662AC 9 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® 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 ST662AB - ST662AC Plastic DIP-8 MECHANICAL DATA mm. inch DIM. MIN. A TYP MAX. MIN. 3.3 TYP. MAX. 0.130 a1 0.7 B 1.39 1.65 0.055 0.065 B1 0.91 1.04 0.036 0.041 b b1 0.028 0.5 0.38 0.020 0.5 D 0.015 0.020 9.8 0.386 E 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 7.1 0.280 I 4.8 0.189 L Z 3.3 0.44 0.130 1.6 0.017 0.063 P001F 16/20 ST662AB - ST662AC Package mechanical data SO-8 MECHANICAL DATA DIM. mm. MIN. TYP inch MAX. MIN. TYP. MAX. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 8˚ (max.) 0.1 0.04 0016023/C 17/20 Package mechanical data ST662AB - ST662AC Tape & Reel SO-8 MECHANICAL DATA mm. inch DIM. MIN. A MAX. MIN. 330 13.2 TYP. MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 18/20 TYP 0.504 22.4 0.519 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 ST662AB - ST662AC Revision history 10 Revision history Table 8. Revision history Date Revision 16-Jul-2007 5 Changes Device summary updated and the document has been reformatted. 19/20 ST662AB - ST662AC 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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