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ST662AC_10 [STMICROELECTRONICS]

DC-DC converter from 5 V to 12 V, 0.03 Afor Flash memory programming supply; 从5伏到12伏， 0.03 AFOR闪存编程电源的DC-DC转换器
ST662AC_10
型号： ST662AC_10
厂家： ST    ST
描述：

DC-DC converter from 5 V to 12 V, 0.03 Afor Flash memory programming supply
从5伏到12伏， 0.03 AFOR闪存编程电源的DC-DC转换器

转换器 闪存 DC-DC转换器
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中文：  中文翻译
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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 µA  
■ 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. 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  
Package  
ST662ABD-TR  
ST662ABD-TRY (1)  
ST662ACD-TR  
SO-8 (tape and reel)  
SO-8 (tape and reel)  
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
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
How to increase output current or output voltage capability . . . . . . . 14  
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
9
10  
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 n°  
Pin description  
Symbol  
Name and function  
1
2
3
4
5
6
7
C1-  
C1+  
C2-  
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  
C2+  
VCC  
VOUT  
GND  
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  
.
8
SHDN  
Connect to GND for normal operation. In Shutdown mode the charge pumps are turned  
off and VOUT = VCC  
4/20  
Doc ID 5068 Rev 8  
ST662AB, ST662AC  
Maximum ratings  
3
Maximum ratings  
Table 3.  
Absolute maximum ratings  
Parameter  
Symbol  
Value  
Unit  
VCC  
SHDN  
IO  
DC input voltage to GND  
Shutdown voltage  
-0.3 to 6  
V
-0.3 to (VCC + 0.3)  
50  
V
A
Output current continuous  
Power dissipation  
PD  
500  
mW  
AC series  
AB series  
0 to 70  
TOP  
Operating ambient temperature range  
Storage temperature range  
°C  
°C  
-40 to 85  
-40 to 150  
TSTG  
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.  
Symbol  
RthJC  
Thermal data  
Parameter  
Thermal resistance junction-case  
SO-8  
Unit  
20  
°C/W  
Doc ID 5068 Rev 8  
5/20  
Electrical characteristics  
ST662AB, ST662AC  
4
Electrical characteristics  
Refer to the test circuits, V = 4.5 V to 5.5 V, T = T  
to T  
, unless otherwise  
MAX  
CC  
A
MIN  
specified. Typical value are referred at T = 25 °C.  
A
Table 5.  
Symbol  
Electrical characteristics  
Parameter  
Test conditions  
O = 0 to 20 mA  
Min.  
Typ.  
12  
Max.  
12.6  
Unit  
I
11.4  
11.4  
VO  
Output voltage  
V
IO = 0 to 30 mA, VCC = 4.75 to 5.5 V  
NO LOAD, VSHDN = 0  
12  
100  
1
12.6  
500  
10  
IQ1  
IQ2  
Quiescent current  
Shutdown current  
µA  
µA  
µA  
µA  
V
NO LOAD, VSHDN = VCC  
V
SHDN = 0, VCC = 5V  
SHDN = VCC = 5V  
-50  
2.4  
-12  
0
-5  
ISH  
Shutdown pin current  
V
VIL  
VIH  
fO  
Shutdown input low threshold  
Shutdown input high threshold  
Oscillator frequency  
0.4  
V
VCC = 5 V, IO = 30 mA  
VCC = 5 V, IO = 30 mA  
400  
72  
1
kHz  
%
n
Power efficiency  
RSW VCC - VOUT switch impedance VSHDN = VCC = 5V, IO = 100 µA  
2
kΩ  
Refer to the test circuits, V = 4.5 V to 5.5 V, T = -40 to 125 °C, unless otherwise  
CC  
A
specified. Typical value are referred at T = 25 °C.  
A
Table 6.  
Symbol  
Electrical characteristics for ST662AB-TRY (Automotive Grade)  
Parameter  
Test conditions  
O = 0 to 20 mA  
Min.  
Typ.  
Max.  
Unit  
I
11.2  
11.2  
12  
12  
100  
1
12.8  
12.8  
500  
15  
VO  
Output voltage  
V
IO = 0 to 30 mA, VCC = 4.75 to 5.5 V  
NO LOAD, VSHDN = 0  
IQ1  
IQ2  
Quiescent current  
Shutdown current  
µA  
µA  
µA  
µA  
V
NO LOAD, VSHDN = VCC  
V
SHDN = 0, VCC = 5V  
-50  
2.4  
-12  
0
-5  
ISH  
Shutdown pin current  
VSHDN = VCC = 5V, TA = 25°C  
VIL  
VIH  
fO  
Shutdown input low threshold  
Shutdown input high threshold  
Oscillator frequency  
0.4  
V
VCC = 5 V, IO = 30 mA, TA = 25°C  
400  
72  
1
kHz  
%
n
Power efficiency  
VCC = 5 V, IO = 30 mA, TA = 25°C  
RSW VCC - VOUT switch impedance VSHDN = VCC = 5V, IO = 100 µA  
2
kΩ  
6/20  
Doc ID 5068 Rev 8  
ST662AB, ST662AC  
Typical performance characteristics  
Output voltage vs. temperature  
5
Typical performance characteristics  
Figure 3.  
Output voltage vs. temperature  
(I = 50 mA)  
Figure 4.  
(I  
= 30 mA)  
OUT  
OUT  
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  
ST662AB, ST662AC  
Figure 9.  
Output voltage vs. shutdown input Figure 10. Output voltage vs. shutdown input  
voltage (No load) voltage (I = 30 mA)  
OUT  
Figure 11. Test circuit  
8/20  
Doc ID 5068 Rev 8  
ST662AB, ST662AC  
Description  
6
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 V voltage. After S1 is opened and S2 closed so that C1 and C2 capacitors are placed  
CC  
in series one to each other, and both are in series with V . The sum of V and V and V  
IN  
C1  
C2  
I
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 V . When it is held low the output voltage rises to  
CC  
+12 V. Figure 13 shows the transition time of the shut down pin when the V  
goes from  
SHDN  
5 V to 0 V. Input logic levels of this input are CMOS compatible Applying a logic high at this  
input, the V oscillator is blocked and the V is reach the V value by D1. In this  
OUT  
OUT  
I
condition I is low as 1 µA. The Figure 14 shows the transition time of the shut down pin  
CC  
when the V  
goes from 0 V to 5 V.  
SHDN  
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 µA  
VCC = 5 V, IOUT = 200 µA  
10/20  
Doc ID 5068 Rev 8  
ST662AB, ST662AC  
Application circuit  
7
Application circuit  
Based on fast charge/discharge of capacitors, this circuit involves high di/dt values limited  
only by R of switches. This implies a critical layout design due to the need to minimize  
ON  
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  
Doc ID 5068 Rev 8  
11/20  
Application circuit  
ST662AB, ST662AC  
Figure 16. Electrical schematic  
Table 7.  
List of component  
Capacitor  
Type  
Value (µF)  
Charge pump C1  
Charge pump C1  
Input C3  
Ceramic  
Ceramic  
0.22  
0.22  
4.7  
Electrolytic tantalum  
Electrolytic tantalum  
Ceramic  
Output C4  
4.7  
Decoupling C5  
0.1  
7.1  
ST662A output performance  
Figure 17. Output voltage vs. output current  
Figure 18. Efficiency vs. output current  
12/20  
Doc ID 5068 Rev 8  
ST662AB, ST662AC  
Application circuit  
Figure 19. Load transient response  
Figure 20. Load transient response  
(I = 30 mA)  
(I  
= 0 to 30 mA)  
OUT  
OUT  
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  
ST662AB, ST662AC  
8
How to increase output current or output voltage  
capability  
Current capability is limited by R of internal switches. It is possible to increase it  
ON  
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  
C2A  
C1B  
C2B  
C3  
Ceramic  
Ceramic  
0.22  
0.22  
0.22  
0.22  
10  
Ceramic  
Ceramic  
Electrolytic Tantalum  
Electrolytic Tantalum  
Ceramic  
C4  
10  
C5  
0.22  
14/20  
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  
ST662AB, ST662AC  
9
Package mechanical data  
In order to meet environmental requirements, ST offers these devices in different grades of  
®
®
ECOPACK packages, depending on their level of environmental compliance. ECOPACK  
specifications, grade definitions and product status are available at: www.st.com.  
®
ECOPACK is an ST trademark.  
16/20  
Doc ID 5068 Rev 8  
ST662AB, ST662AC  
Package mechanical data  
SO-8 mechanical data  
mm.  
inch.  
Dim.  
Min.  
Typ.  
Max.  
Min.  
Typ.  
Max.  
A
A1  
A2  
B
1.35  
0.10  
1.10  
0.33  
0.19  
4.80  
3.80  
1.75  
0.053  
0.069  
0.25  
1.65  
0.51  
0.25  
5.00  
4.00  
0.04  
0.010  
0.065  
0.020  
0.010  
0.197  
0.157  
0.043  
0.013  
0.007  
0.189  
0.150  
C
D
E
e
1.27  
0.050  
H
5.80  
0.25  
0.40  
6.20  
0.50  
1.27  
0.228  
0.010  
0.016  
0.244  
0.020  
0.050  
h
L
k
8° (max.)  
ddd  
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.  
Typ.  
Dim.  
Min.  
Typ.  
Max.  
330  
Min.  
Max.  
12.992  
0.519  
A
C
D
12.8  
20.2  
60  
13.2  
0.504  
0.795  
2.362  
N
T
22.4  
8.5  
5.9  
2.3  
4.1  
8.1  
0.882  
0.335  
0.232  
0.090  
0.161  
0.319  
Ao  
Bo  
Ko  
Po  
P
8.1  
5.5  
2.1  
3.9  
7.9  
0.319  
0.216  
0.082  
0.153  
0.311  
18/20  
Doc ID 5068 Rev 8  
ST662AB, ST662AC  
Revision history  
10  
Revision history  
Table 9.  
Document revision history  
Revision  
Date  
Changes  
16-Jul-2007  
07-Feb-2008  
19-Feb-2008  
03-Aug-2010  
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.  
Doc ID 5068 Rev 8  
19/20  
ST662AB, ST662AC  
Please Read Carefully:  
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20/20  
Doc ID 5068 Rev 8  

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