ST662ABD [STMICROELECTRONICS]
DC-DC CONVERTER FROM 5V TO 12V, 0.03A FOR FLASH MEMORY PROGRAMMING SUPPLY; DC- DC转换器从5V至12V ， 0.03A闪存编程电源
| 型号： | ST662ABD |
| 厂家： | 
ST |
| 描述： | DC-DC CONVERTER FROM 5V TO 12V, 0.03A FOR FLASH MEMORY PROGRAMMING SUPPLY |
| 文件： | 总12页 (文件大小：133K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ST662A
DC-DC CONVERTER FROM 5V TO 12V, 0.03A
FOR FLASH MEMORY PROGRAMMING SUPPLY
■
■
■
OUTPUT VOLTAGE: 12V ± 5%
SUPPLY VOLTAGE RANGE: 4.5V TO 5.5V
GUARANTEED OUTPUT CURRENT UP TO
30mA
■
■
VERY LOW QUIESCENT CURRENT: 100µA
LOGIC CONTROLLED ELECTRONIC
SHUTDOWN: 1µA
DIP-8
■
JUST CAPACITORS NEEDED (NO
INDUCTOR)
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 sypply
current to only 1µA
SO-8
TYPICAL APPLICATION CIRCUIT
1/12
June 1997
ST662A
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
-0.3 to 6
-0.3 to VCC+0.3
50
Unit
V
Vcc
DC Input Voltage to GND
SHDN Shutdown Voltage
V
Io
Output Current Continuous
Power Dissipation
mA
mW
Ptot
Top
500
Operating Ambient Temperature Range (for AC SERIES)
(for AB SERIES)
0 to 70
- 40 to 85
oC
oC
Tstg
Storage Temperature Range
- 40 to 150
oC
Absolute Maximum Rating are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
CONNECTION DIAGRAM AND (top view)
PIN CONNECTIONS
Pin No
Symbol
C1-
Name and Function
1
2
3
4
5
6
7
8
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
C1+
C2-
C2+
VCC
VOUT
GND
SHDN
12V Output Voltage VOUT = VCC When in Sshutdown Mode
Ground
ActiveHigh C-MOS logic level Shutdown Input. SHDN is internally pulled up to
CC. Connect to GND for Normal Operation. In Shutdown mode the charge
V
pumps are turned off and VOUT = VCC
ORDERING NUMBERS
Type
DIP-8
ST662ABN
SO-8 (*)
ST662AB
ST662ABD
ST662ACD
ST662AC
ST662ACN
(*) AVAILABLE IN TAPE AND REEL WITH ”-TR” SUFFIX
2/12
ST662A
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 oC)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Io = 0 mA to 20 mA
Min.
11.4
11.4
Typ.
12
Max.
12.6
12.6
500
10
Unit
V
Vo
Output Voltage
Io = 0 mA to 30 mA VCC = 4.75 to 5.5 V
No Load, VSHDN = 0
12
V
IQ1
Quiescent Current
Shutdown Current
Shutdown Pin Current
100
1
µA
µA
IQ2
No Load, VSHDN = VCC
ISH
VSHDN = 0V, VCC = 5V
VSHDN = VCC = 5V
-50
2.4
-12
0
-5
µA
µA
Vil
Shutdown Input Low Threshold
0.4
V
V
Vih
Shutdown Input High
Threshold
fo
ν
Oscillator Frequency
Power Efficecy
VCC = 5V, Io = 30 mA
400
72
1
KHz
%
VCC = 5V, Io = 30 mA
Rsw
VCC - VOUT Switch Impedance VSHDN = VCC = 5V, Io = 100 µA
2
KΩ
Do not overload or short the Output to Ground. If the above conditions are observerd, the device may be damaged.
Output Voltage vs Temperature
Output Voltage vs Temperature
Supply Current vs Temperature
Supply Currernt vs Supply Voltage
3/12
ST662A
SHDN Pin Current vs Temperature
Output Voltage vs Shutdown Input Voltage
Output Voltage vs Shutdown Input Voltage
Output Voltage vs Shutdown Input Voltage
Test Circuit
4/12
ST662A
DESCRIPTION
Figure 1: OperatingPrinciple Circuit
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 fig. 1) 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 Vin is
applied to the capacitor C4. This works as
voltage tripler. 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. Fig.2 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
theVIN value by D1. In this condition ICC will be
low as 1µA. The fig.3 shows the transition time
of the shut down pin when the VSHDN goes from
0V to 5V.
Figure 2: Exiting Shutdown
Figure 3: Entering Shutdown
SHDN
5V
5V
SHDN
0V
0V
Vout
12V
12V
Vout
5V
5V
TIME= 20us/DIV, VERTICAL = 5V/DIV
TIME= 1ms/DIV, VERTICAL = 5V/DIV
NOTE: VCC = 5V, IOUT = 200µA
NOTE: VCC = 5V, IOUT = 200µA
5/12
ST662A
APPLICATION CIRCUIT
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.
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 1.
Fig
4 and Fig 5 show, respectively, our
EVALUATION kit layout and the relatively
electrical shematic.
Figure 4: KIT Lay-out
Figure 5: Electrical Schematic
Table 1: List of Components
CAPACITOR
TYPE
Ceramic
VALUE (µF)
0.22
Charge Pump C1
Charge Pump C2
Input C3
Ceramic
0.22
Electrolytic Tantalum
Electrolytic Tantalum
Ceramic
4.7
Output C4
4.7
Decoupling C5
0.1
6/12
ST662A
ST662A OUTPUT PERFORMANCE
Output Voltage vs Output Current
Efficency vs Output Current
Load Transient Response
Line Transient Response
SHDN
Vout
Iout
20mA/div
5.5V
4.5V
Vin
1V/div
Vout
200mV/div
Vout
100mV/div
TIME= 1ms/DIV
TIME= 1ms/DIV
NOTE: VCC = 5V, IOUT = 0 to 30mA
NOTE: VCC = 4.5 to 5.5V, IOUT = 30mA
7/12
ST662A
HOW TO INCREASE OUTPUT CURRENT OR
OUTPUT VOLTAGE CAPABILITY
different capacitors, each of them of half value,
very close to the respective integrated circuit.
Fig. 8 show the Output Current capability of the
proposedcircuit.
If an output voltage greater than 12V is required,
it’s possible to realize the circuit of the following
diagram (figure 7). The relevant Output Current
capability is shown in figure 9 in which is shown
the output voltage vs load current.
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 6 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
Figure 6: Application Circuit for Two ST662A in Parallel
Table 2: List of Components
CAPACITOR
TYPE
VALUE (µF)
0.22
0.22
0.22
0.22
10
C1A
C2A
C1B
C2B
Ceramic
Ceramic
Ceramic
Ceramic
C3
C4
C5
Electrolytic Tantalum
Electrolytic Tantalum
Ceramic
10
0.22
8/12
ST662A
Figure 7: Application Circuit for Output Voltage greater than 12V
Figure 8: Output Voltage for the Application with
Two Device in Parallel
Figure 9: Output Voltage for Application with
Output Voltage greater than 12V
9/12
ST662A
Plastic DIP-8 MECHANICAL DATA
mm
inch
TYP.
0.130
DIM.
MIN.
TYP.
MAX.
MIN.
MAX.
A
a1
B
3.3
0.7
0.028
0.055
0.036
1.39
0.91
1.65
1.04
0.065
0.041
B1
b
0.5
0.020
b1
D
E
0.38
0.5
9.8
0.015
0.020
0.386
8.8
0.346
0.100
0.300
0.300
e
2.54
7.62
7.62
e3
e4
F
7.1
4.8
0.280
0.189
I
L
3.3
0.130
Z
0.44
1.6
0.017
0.063
P001F
10/12
ST662A
SO-8 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
MIN.
MAX.
0.068
0.009
0.064
0.033
0.018
0.010
0.019
A
a1
a2
a3
b
0.1
0.003
0.65
0.35
0.19
0.25
0.025
0.013
0.007
0.010
b1
C
c1
D
45 (typ.)
4.8
5.8
5.0
6.2
0.188
0.228
0.196
0.244
E
e
1.27
3.81
0.050
0.150
e3
F
3.8
0.4
4.0
1.27
0.6
0.14
0.157
0.050
0.023
L
0.015
M
S
8 (max.)
0016023
11/12
ST662A
Information furnished is believed to be accurateand reliable. However, SGS-THOMSON Microelectronics assumes no responsabilityfor the
consequences of use of such informationnor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all informationpreviously supplied.
SGS-THOMSONMicroelectronics products are notauthorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
1997 SGS-THOMSON Microelectronics- Printedin Italy - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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.
12/12
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