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 mA ■ Logic controlled electronic shutdown: 1 µA ■ 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 µA. The ST662AB is available as Automotive Grade in SO-8 package, whose commercial Part Number is shown in the Table 1 (device summary). This device is qualified according to the specification AEC-Q100 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 Part numbers SO-8 (tape and reel) ST662AB ST662ABD-TR ST662AB ST662ABD-TRY (1) ST662AC ST662ACD-TR 1. Automotive Grade products. February 2008 Rev 7 1/19 www.st.com 19 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 . . . . . . . 13 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 ST662AB - ST662AC 1 Application circuit Figure 1. Typical application circuit Application circuit 3/19 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 4/19 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 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 SO-8 Unit 20 °C/W 5/19 Electrical characteristics ST662AB - ST662AC 4 Electrical characteristics Table 5. 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) 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 Table 6. Symbol 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 Electrical characteristics for ST662AB-TRY (Automotive Grade) (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) 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 µA 1 15 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, TA = 25°C 400 kHz n Power efficiency VCC = 5 V, IO = 30 mA, TA = 25°C 72 % RSW 6/19 VSHDN = 0, VCC = 5V V -50 VSHDN = VCC = 5V, TA = 25°C 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 7/19 Typical performance characteristics Figure 9. Output voltage vs shutdown input voltage Figure 11. Test circuit 8/19 ST662AB - ST662AC Figure 10. Output voltage vs shutdown input voltage 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 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 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 will be blocked and the VOUT will reach the VI value by D1. In this condition ICC will be. low as 1 µA. 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 9/19 Description ST662AB - ST662AC Figure 13. Exiting shutdown Figure 14. Entering shutdown VCC = 5 V, IOUT = 200 µA VCC = 5 V, IOUT = 200 µA 10/19 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 µF and 1 µF, respectively, when using ceramic capacitors, but must be of 10 µF 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 Figure 16. Electrical schematic 11/19 Application circuit Table 7. 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 12/19 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 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. 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 13/19 How to increase output current or output voltage capability ST662AB - ST662AC Figure 22. Application circuit for output voltage greater than 12 V Figure 23. Output voltage for the application with two device in parallel 14/19 Figure 24. Output voltage for application with output voltage greater than 12 V 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. 15/19 Package mechanical data ST662AB - ST662AC 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 16/19 ST662AB - ST662AC Package mechanical data Tape & reel SO-8 mechanical data mm. inch. Dim. Min. A Typ. Max. Min. 330 Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 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 17/19 Revision history ST662AB - ST662AC 10 Revision history Table 9. Document revision history Date Revision 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. 18/19 Changes 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. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. © 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 19/19