ST662AB ST662AC DC-DC converter from 5 V to 12 V, 0.03 A for Flash memory programming supply Features Output voltage: 12 V 5 % Supply voltage range: 4.5 V to 5.5 V Guaranteed output current up to 30 mA Very low quiescent current: 100 A Logic controlled electronic shutdown: 1 A Just capacitors needed (no inductor) SO-8 Description The ST662A is a regulated charge pump DC-DC converter. It provides 12 V 5 % output voltage to program byte-wide Flash memory, and can supply 30 mA output current from input as low as 4.75 V. A logic controlled shut down pin that interfaces directly with microprocessor reduces the supply current to only 1 A. The ST662AB is available as Automotive Grade in SO-8 package. This device is qualified according to the specification AECQ100 of the Automotive market, in the temperature range - 40 C to 125 C, and the statistical tests PAT, SYL, SBL are performed. Table 1. Device summary Order codes Package ST662ABD-TR ST662ABD-TRY SO-8 (tape and reel) (1) SO-8 (tape and reel) ST662ACD-TR SO-8 (tape and reel) 1. Automotive Grade products. August 2010 Doc ID 5068 Rev 8 1/20 www.st.com 20 Contents 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 . . . . . . . 14 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 Doc ID 5068 Rev 8 ST662AB, ST662AC Application circuit 1 Application circuit Figure 1. Typical application circuit Doc ID 5068 Rev 8 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 12 V 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 Doc ID 5068 Rev 8 ST662AB, ST662AC Maximum ratings 3 Maximum ratings Table 3. Absolute maximum ratings Symbol VCC SHDN Parameter DC input voltage to GND Shutdown voltage Value Unit -0.3 to 6 V -0.3 to (VCC + 0.3) V IO Output current continuous 50 A PD Power dissipation 500 mW TOP Operating ambient temperature range TSTG Storage temperature range 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 Doc ID 5068 Rev 8 SO-8 Unit 20 C/W 5/20 Electrical characteristics 4 ST662AB, ST662AC Electrical characteristics Refer to the test circuits, VCC = 4.5 V to 5.5 V, TA = TMIN to TMAX, unless otherwise specified. Typical value are referred at TA = 25 C. Table 5. Symbol Electrical characteristics 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 A 1 10 A -12 -5 A 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 VSHDN = 0, VCC = 5V V -50 VSHDN = VCC = 5V 0 A 0.4 2.4 VCC - VOUT switch impedance VSHDN = VCC = 5V, IO = 100 A V V 1 2 k Refer to the test circuits, VCC = 4.5 V to 5.5 V, TA = -40 to 125 C, unless otherwise specified. Typical value are referred at TA = 25 C. Table 6. Symbol Electrical characteristics for ST662AB-TRY (Automotive Grade) Parameter Test conditions Min. Typ. Max. Unit IO = 0 to 20 mA 11.2 12 12.8 IO = 0 to 30 mA, VCC = 4.75 to 5.5 V 11.2 12 12.8 100 500 A 1 15 A -12 -5 A 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, TA = 25C 400 kHz n Power efficiency VCC = 5 V, IO = 30 mA, TA = 25C 72 % RSW 6/20 VSHDN = 0, VCC = 5V V -50 VSHDN = VCC = 5V, TA = 25C 0 A 0.4 2.4 VCC - VOUT switch impedance VSHDN = VCC = 5V, IO = 100 A Doc ID 5068 Rev 8 V V 1 2 k ST662AB, ST662AC Typical performance characteristics 5 Typical performance characteristics Figure 3. Output voltage vs. temperature (IOUT = 50 mA) Figure 4. Output voltage vs. temperature (IOUT = 30 mA) 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 Doc ID 5068 Rev 8 7/20 Typical performance characteristics Figure 9. ST662AB, ST662AC Output voltage vs. shutdown input Figure 10. Output voltage vs. shutdown input voltage (No load) voltage (IOUT = 30 mA) Figure 11. Test circuit 8/20 Doc ID 5068 Rev 8 ST662AB, ST662AC 6 Description Description The ST662 is an IC developed to provide a 12 V regulated output 30 mA from voltage input as low as 4.75 without any inductors. It is useful for a wide range of applications and its performances make 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 is 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 12 V. The shutdown pin is internally pulled to VCC. When it is held low the output voltage rises to +12 V. Figure 13 shows the transition time of the shut down pin when the VSHDN goes from 5 V to 0 V. Input logic levels of this input are CMOS compatible Applying a logic high at this input, the VOUT oscillator is blocked and the VOUT is reach the VI value by D1. In this condition ICC is low as 1 A. The Figure 14 shows the transition time of the shut down pin when the VSHDN goes from 0 V to 5 V. Figure 12. Operating principle circuit Doc ID 5068 Rev 8 9/20 Description ST662AB, ST662AC Figure 13. Exiting shutdown Figure 14. Entering shutdown VCC = 5 V, IOUT = 200 A VCC = 5 V, IOUT = 200 A 10/20 Doc ID 5068 Rev 8 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 7. C3 and C4 must have low ESR in order to minimize the output ripple. Their values can be reduced to 2 F and 1 F, respectively, when using ceramic capacitors, but must be of 10 F 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 layout Doc ID 5068 Rev 8 11/20 Application circuit ST662AB, ST662AC Figure 16. Electrical schematic Table 7. 7.1 List of component Capacitor Type Value (F) 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 12/20 Figure 18. Efficiency vs. output current Doc ID 5068 Rev 8 ST662AB, ST662AC Application circuit Figure 19. Load transient response (IOUT = 0 to 30 mA) Figure 20. Load transient response (IOUT = 30 mA) VCC = 5 V, IOUT = 0 to 30mA VCC = 4.5 to 5.5V, IOUT = 30 mA Doc ID 5068 Rev 8 13/20 How to increase output current or output voltage capability 8 ST662AB, ST662AC 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 30 mA. 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 12 V 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 8. 14/20 List of component Capacitor Type Value (F) 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 Doc ID 5068 Rev 8 ST662AB, ST662AC How to increase output current or output voltage capability Figure 22. Application circuit for output voltage greater than 12 V Figure 23. Output voltage for application with Figure 24. Output voltage for application with two device in parallel output voltage greater than 12 V Doc ID 5068 Rev 8 15/20 Package mechanical data 9 ST662AB, ST662AC Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 16/20 Doc ID 5068 Rev 8 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 Doc ID 5068 Rev 8 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 Doc ID 5068 Rev 8 ST662AB, ST662AC Revision history 10 Revision history Table 9. Document revision history Date Revision Changes 16-Jul-2007 5 Device summary updated. 07-Feb-2008 6 Modified: Table 1 on page 1. 19-Feb-2008 7 Add new order code for Automotive grade products see Table 1 on page 1. 03-Aug-2010 8 Modified Features on page 1. Doc ID 5068 Rev 8 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. 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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