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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 ST662ABD-TR ST662ABD-TRY
(1)
Package SO-8 (tape and reel) SO-8 (tape and reel) SO-8 (tape and reel)
ST662ACD-TR
1. Automotive Grade products.
August 2010
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Contents
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 . . . . . . . 14 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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Application circuit
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Figure 1.
Application circuit
Typical application circuit
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Pin configuration
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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 12 V 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
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Table 3.
Symbol VCC SHDN IO PD 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
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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 VO IQ1 IQ2 ISH VIL VIH fO n RSW
Electrical characteristics
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
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 VO IQ1 IQ2 ISH VIL VIH fO n RSW
Electrical characteristics for ST662AB-TRY (Automotive Grade)
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, TA = 25C VCC = 5 V, IO = 30 mA, TA = 25C 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, TA = 25C -50 Min. 11.2 11.2 Typ. 12 12 100 1 -12 0 0.4 Max. 12.8 V 12.8 500 15 -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
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Figure 3.
Typical performance characteristics
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
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Typical performance characteristics
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Figure 9.
Output voltage vs. shutdown input Figure 10. Output voltage vs. shutdown input voltage (No load) voltage (IOUT = 30 mA)
Figure 11. Test circuit
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Description
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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
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Description Figure 13. Exiting shutdown
ST662AB, ST662AC Figure 14. Entering shutdown
VCC = 5 V, IOUT = 200 A
VCC = 5 V, IOUT = 200 A
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Application circuit
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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
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Application circuit
ST662AB, ST662AC
Figure 16. Electrical schematic
Table 7.
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
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ST662AB, ST662AC Figure 19. Load transient response (IOUT = 0 to 30 mA)
Application circuit Figure 20. Load transient response (IOUT = 30 mA)
VCC = 5 V, IOUT = 0 to 30mA
VCC = 4.5 to 5.5V, IOUT = 30 mA
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How to increase output current or output voltage capability
ST662AB, ST662AC
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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 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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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
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Package mechanical data
ST662AB, ST662AC
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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.
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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 8 (max.) 0.04 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
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
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Table 9.
Date
Revision history
Document revision history
Revision 5 6 7 8 Device summary updated. Modified: Table 1 on page 1. Add new order code for Automotive grade products see Table 1 on page 1. Modified Features on page 1. Changes
16-Jul-2007 07-Feb-2008 19-Feb-2008 03-Aug-2010
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