STMICROELECTRONICS ST662ACN

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: 1µA
■
Just capacitors needed (no inductor)
DIP-8
Description
SO-8
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 1µA.
Table 1.
Device summary
Packages
Order codes
DIP-8
ST662AB
ST662AC
July 2007
SO-8 (tape & reel)
ST662ABD-TR
ST662ACN
Rev. 5
ST662ACD-TR
1/20
www.st.com
20
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
ST662AB - ST662AC
1
Application circuit
Figure 1.
Typical application circuit
Application circuit
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
12V 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
ST662AB - ST662AC
Maximum ratings
3
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Value
Unit
-0.3 to 6
V
-0.3 to (VCC + 0.3)
V
Output current continuous
50
A
PTOT
Power dissipation
500
mW
TOP
Operating ambient temperature range
TSTG
Storage temperature range
VCC
SHDN
IO
Parameter
DC input voltage to GND
Shutdown voltage
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
5/20
Electrical characteristics
ST662AB - ST662AC
4
Electrical characteristics
Table 5.
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 = 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
6/20
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
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
7/20
Typical performance characteristics
Figure 9.
Output voltage vs shutdown input
voltage
Figure 11. Test circuit
8/20
ST662AB - ST662AC
Figure 10. Output voltage vs shutdown input
voltage
ST662AB - ST662AC
6
Description
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 1µA. 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
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
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 6.
C3 and C4 must have low ESR in order to minimize the output ripple. Their values can be
reduced to 2µF and 1µF, respectively, when using ceramic capacitors, but must be of 10µF
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
11/20
Application circuit
Table 6.
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
12/20
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 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
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
13/20
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
14/20
Figure 24. Output voltage for application with
output voltage greater than 12V
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.
15/20
Package mechanical data
ST662AB - ST662AC
Plastic DIP-8 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
TYP
MAX.
MIN.
3.3
TYP.
MAX.
0.130
a1
0.7
B
1.39
1.65
0.055
0.065
B1
0.91
1.04
0.036
0.041
b
b1
0.028
0.5
0.38
0.020
0.5
D
0.015
0.020
9.8
0.386
E
8.8
0.346
e
2.54
0.100
e3
7.62
0.300
e4
7.62
0.300
F
7.1
0.280
I
4.8
0.189
L
Z
3.3
0.44
0.130
1.6
0.017
0.063
P001F
16/20
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
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
ST662AB - ST662AC
Revision history
10
Revision history
Table 8.
Revision history
Date
Revision
16-Jul-2007
5
Changes
Device summary updated and the document has been reformatted.
19/20
ST662AB - ST662AC
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