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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: 1A Just capacitors needed (no inductor)
DIP-8 SO-8
Description
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 1A.
Table 1.
Device summary
Packages Order codes DIP-8 ST662AB ST662AC ST662ACN SO-8 (tape & reel) ST662ABD-TR ST662ACD-TR
July 2007
Rev. 5
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ST662AB - ST662AC
Contents
1 2 3 4 5 6 7 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.1 ST662A output performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8 9 10
How to increase output current or output voltage capability . . . . . . . 13 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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ST662AB - ST662AC
Application circuit
1
Figure 1.
Application circuit
Typical application circuit
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Pin configuration
ST662AB - ST662AC
2
Figure 2.
Pin configuration
Pin connections (top view)
Table 2.
Pin N 1 2 3 4 5 6 7 8
Pin description
Symbol C1C1+ C2C2+ VCC VOUT GND SHDN Name and function Negative terminal for the first charge pump capacitor Positive terminal for the first charge pump capacitor Negative terminal for the second charge pump capacitor Positive terminal for the second charge pump capacitor Supply voltage 12V output voltage VOUT = VCC when in shutdown mode Ground 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
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Maximum ratings
3
Table 3.
Symbol VCC SHDN IO PTOT TOP TSTG
Maximum ratings
Absolute maximum ratings
Parameter DC input voltage to GND Shutdown voltage Output current continuous Power dissipation AC SERIES Operating ambient temperature range AB SERIES Storage temperature range -40 to 85 -40 to 150 C Value -0.3 to 6 -0.3 to (VCC + 0.3) 50 500 0 to 70 C Unit V V A mW
Note:
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Thermal data
Parameter Thermal resistance junction-case SO-8 20 Unit C/W
Table 4.
Symbol RthJC
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Electrical characteristics
ST662AB - ST662AC
4
Table 5.
Symbol VO IQ1 IQ2 ISH VIL VIH fO n RSW
Electrical characteristics
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 = 25C)
Parameter Output voltage Quiescent current Shutdown current Shutdown pin current Shutdown input low threshold Shutdown input high threshold Oscillator frequency Power efficiency VCC = 5 V, IO = 30 mA VCC = 5 V, IO = 30 mA 2.4 400 72 1 2 Test conditions IO = 0 to 20 mA IO = 0 to 30 mA, VCC = 4.75 to 5.5 V NO LOAD, VSHDN = 0 NO LOAD, VSHDN = VCC VSHDN = 0, VCC = 5V VSHDN = VCC = 5V -50 Min. 11.4 11.4 Typ. 12 12 100 1 -12 0 0.4 Max. 12.6 V 12.6 500 10 -5 A A A A V V KHz % K Unit
VCC - VOUT switch impedance VSHDN = VCC = 5V, IO = 100 A
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Typical performance characteristics
5
Figure 3.
Typical performance characteristics
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
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Typical performance characteristics
ST662AB - ST662AC
Figure 9.
Output voltage vs shutdown input voltage
Figure 10. Output voltage vs shutdown input voltage
Figure 11. Test circuit
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ST662AB - ST662AC
Description
6
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 1A. 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
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Description
ST662AB - ST662AC
Figure 13. Exiting shutdown
Figure 14. Entering shutdown
VCC = 5 V, IOUT = 200 A
VCC = 5 V, IOUT = 200 A
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Application circuit
7
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 2F and 1F, respectively, when using ceramic capacitors, but must be of 10F 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
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Application circuit
ST662AB - ST662AC
Table 6.
List of component
Capacitor Charge Pump C1 Charge Pump C1 Input C3 Output C4 Decoupling C5 Type Ceramic Ceramic Electrolytic Tantalum Electrolytic Tantalum Ceramic Value (F) 0.22 0.22 4.7 4.7 0.1
7.1
ST662A output performance
Figure 18. Efficiency vs output current
Figure 17. Output voltage 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
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ST662AB - ST662AC
How to increase output current or output voltage capability
8
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 C1A C2A C1B C2B C3 C4 C5 Type Ceramic Ceramic Ceramic Ceramic Electrolytic Tantalum Electrolytic Tantalum Ceramic Value (F) 0.22 0.22 0.22 0.22 10 10 0.22
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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
Figure 24. Output voltage for application with output voltage greater than 12V
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Package mechanical data
9
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.
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Package mechanical data
ST662AB - ST662AC
Plastic DIP-8 MECHANICAL DATA
mm. DIM. MIN. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3.3 1.6 0.017 8.8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9.8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 TYP 3.3 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 MAX. MIN. TYP. 0.130 MAX. inch
P001F
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Package mechanical data
SO-8 MECHANICAL DATA
DIM. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. MIN. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 0.228 0.010 0.016 TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 MIN. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.197 0.157
8 (max.)
0.04
0016023/C
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Package mechanical data
ST662AB - ST662AC
Tape & Reel SO-8 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 8.1 5.5 2.1 3.9 7.9 12.8 20.2 60 22.4 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch
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Revision history
10
Table 8.
Date
Revision history
Revision history
Revision 5 Changes Device summary updated and the document has been reformatted.
16-Jul-2007
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ST662AB - ST662AC
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