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)
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 AECQ100 of the Automotive market, in the
temperature range - 40 °C to 125 °C, and the
statistical tests PAT, SYL, SBL are performed.
ST662AB
ST662AC
SO-8
Table 1. Device summary
Order codes Package
ST662ABD-TR SO-8 (tape and reel)
ST662ABD-TRY
ST662ACD-TR SO-8 (tape and reel)
1. Automotive Grade products.
August 2010 Doc ID 5068 Rev 8 1/20
(1)
SO-8 (tape and reel)
www.st.com
20
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 . . . . . . . 14
9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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 description
Pin n° Symbol Name and function
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
5V
6V
CC
OUT
Supply voltage
12 V output voltage V
= VCC when in shutdown mode
OUT
7 GND Ground
Active high C-MOS logic level shutdown input. SHDN is internally pulled up to V
8 SHDN
Connect to GND for normal operation. In Shutdown mode the charge pumps are turned
off and V
OUT
= V
CC
CC
.
4/20 Doc ID 5068 Rev 8
ST662AB, ST662AC Maximum ratings
3 Maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC
SHDN Shutdown voltage -0.3 to (V
I
O
P
D
DC input voltage to GND -0.3 to 6 V
+ 0.3) V
CC
Output current continuous 50 A
Power dissipation 500 mW
AC series 0 to 70
T
T
OP
STG
Operating ambient temperature range
°C
AB series -40 to 85
Storage temperature range -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 Parameter SO-8 Unit
R
thJC
Thermal resistance junction-case 20 °C/W
Doc ID 5068 Rev 8 5/20
Electrical characteristics ST662AB, ST662AC
4 Electrical characteristics
Refer to the test circuits, VCC = 4.5 V to 5.5 V, TA = T
specified. Typical value are referred at T
Table 5. Electrical characteristics
= 25 °C.
A
MIN
to T
, unless otherwise
MAX
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
= 0 to 20 mA 11.4 12 12.6
V
Output voltage
O
I
Quiescent current NO LOAD, V
Q1
Shutdown current NO LOAD, V
I
Q2
I
Shutdown pin current
SH
Shutdown input low threshold 0.4 V
V
IL
V
Shutdown input high threshold 2.4 V
IH
Oscillator frequency VCC = 5 V, IO = 30 mA 400 kHz
f
O
n Power efficiency V
R
SWVCC
- V
switch impedance V
OUT
O
= 0 to 30 mA, VCC = 4.75 to 5.5 V 11.4 12 12.6
I
O
= 0 100 500 µA
SHDN
= V
SHDN
V
= 0, V
SHDN
V
SHDN
= 5 V, IO = 30 mA 72 %
CC
SHDN
CC
= V
= 5V 0 µA
CC
= V
= 5V, IO = 100 µA 1 2 kΩ
CC
CC
= 5V -50 -12 -5 µA
110µA
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 T
Table 6. Electrical characteristics for ST662AB-TRY (Automotive Grade)
= 25 °C.
A
V
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
= 0 to 20 mA 11.2 12 12.8
V
Output voltage
O
Quiescent current NO LOAD, V
I
Q1
I
Shutdown current NO LOAD, V
Q2
I
Shutdown pin current
SH
V
Shutdown input low threshold 0.4 V
IL
Shutdown input high threshold 2.4 V
V
IH
Oscillator frequency VCC = 5 V, IO = 30 mA, TA = 25°C 400 kHz
f
O
n Power efficiency V
- V
R
SWVCC
switch impedance V
OUT
O
= 0 to 30 mA, VCC = 4.75 to 5.5 V 11.2 12 12.8
I
O
= 0 100 500 µA
SHDN
= V
SHDN
V
= 0, V
SHDN
V
SHDN
= 5 V, IO = 30 mA, TA = 25°C 72 %
CC
SHDN
CC
= V
= 5V, TA = 25°C 0 µA
CC
= V
= 5V, IO = 100 µA 1 2 kΩ
CC
CC
= 5V -50 -12 -5 µA
115µA
6/20 Doc ID 5068 Rev 8
V
ST662AB, ST662AC Typical performance characteristics
5 Typical performance characteristics
Figure 3. Output voltage vs. temperature
(I
= 50 mA)
Figure 5. Supply current vs. temperature Figure 6. Supply current vs. supply voltage
OUT
Figure 4. Output voltage vs. temperature
(I
= 30 mA)
OUT
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 11. Test circuit
voltage (No load)
Figure 10. Output voltage vs. shutdown input
voltage (I
= 30 mA)
OUT
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
in series one to each other, and both are in series with V
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
+12 V. Figure 13 shows the transition time of the shut down pin when the V
5 V to 0 V. Input logic levels of this input are CMOS compatible Applying a logic high at this
input, the V
condition I
when the V
voltage. After S1 is opened and S2 closed so that C1 and C2 capacitors are placed
CC
. When it is held low the output voltage rises to
CC
oscillator is blocked and the V
OUT
is low as 1 µA. The Figure 14 shows the transition time of the shut down pin
CC
goes from 0 V to 5 V.
SHDN
is reach the VI value by D1. In this
OUT
. The sum of VC1 and VC2 and VI
IN
goes from
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, I
OUT
= 200 µA
VCC = 5 V, I
OUT
= 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
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 Tab l e 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
of switches. This implies a critical layout design due to the need to minimize
ON
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 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
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
(I
= 0 to 30 mA)
VCC = 5 V, I
OUT
= 0 to 30mA
OUT
Figure 20. Load transient response
(I
= 30 mA)
VCC = 4.5 to 5.5V, I
OUT
OUT
= 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 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
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
two device in parallel
Figure 24. Output voltage for application with
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
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
16/20 Doc ID 5068 Rev 8
ST662AB, ST662AC Package mechanical data
SO-8 mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
mm. inch.
A1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065
B0.33 0.51 0.013 0.020
C0.19 0.25 0.007 0.010
D4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H5.80 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 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.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 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
P7.98.1 0.311 0.319
18/20 Doc ID 5068 Rev 8
ST662AB, ST662AC Revision history
10 Revision history
Table 9. Document revision history
Date Revision Changes
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.
03-Aug-2010 8 Modified Features on page 1.
Doc ID 5068 Rev 8 19/20
ST662AB, ST662AC
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