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PDF MAX662AMJA Data sheet ( Hoja de datos )
| Número de pieza | MAX662AMJA | |
| Descripción | +12V / 30mA Flash Memory Programming Supply | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0253; Rev 1; 8/94
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
+12V, 30mA Flash Memory
Programming Supply
_______________General Description
The MAX662A is a regulated +12V, 30mA-output, charge-
pump DC-DC converter. It provides the necessary +12V
±5% output to program byte-wide flash memories, and
requires no inductors to deliver a guaranteed 30mA out-
put from inputs as low as 4.75V. It fits into less than 0.1in2
of board space. The MAX662A is a pin-compatible
upgrade to the MAX662, and is recommended for new
designs. The MAX662A offers lower quiescent and shut-
down currents, and guarantees the output current over all
temperature ranges.
The MAX662A is the first charge-pump boost converter to
provide a regulated +12V output. It requires only a few
inexpensive capacitors, and the entire circuit is complete-
ly surface-mountable.
A logic-controlled shutdown pin that interfaces directly
with microprocessors reduces the supply current to only
0.5µA. The MAX662A comes in 8-pin narrow SO and DIP
packages.
For higher-current flash memory programming solutions,
refer to the data sheets for the MAX734 (120mA output
current, guaranteed) and MAX732 (200mA output cur-
rent, guaranteed) PWM, switch-mode DC-DC converters.
Or, refer to the MAX761 data sheet for a 150mA, PFM
switch-mode DC-DC converter that operates from inputs
as low as 2V.
________________________Applications
+12V Flash Memory Programming Supplies
Compact +12V Op-Amp Supplies
Switching MOSFETs in Low-Voltage Systems
Dual-Output +12V and +20V Supplies
____________________________Features
o Regulated +12V ±5% Output Voltage
o 4.5V to 5.5V Supply Voltage Range
o Fits in 0.1in2
o Guaranteed 30mA Output
o No Inductor—Uses Only 4 Capacitors
o 185µA Quiescent Current
o Logic-Controlled 0.5µA Shutdown
o 8-Pin Narrow SO and DIP Packages
______________Ordering Information
PART
MAX662ACPA
MAX662ACSA
MAX662AC/D
MAX662AEPA
MAX662AESA
MAX662AMJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
* Dice are tested at TA = +25°C.
** Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit
INPUT
4.75V TO 5.5V
4.7µF
0.22µF
VCC
SHDN
VOUT
MAX662A
C1+ C2-
C1- C2+
GND
OUTPUT
12V ±5%
30mA
0.22µF 4.7µF
Vpp
FLASH
MEMORY
__________________Pin Configuration
TOP VIEW
C1- 1
C1+ 2
C2- 3
C2+ 4
MAX662A
8 SHDN
7 GND
6 VOUT
5 VCC
DIP/SO
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
1 page  
+12V, 30mA Flash Memory
Programming Supply
Table 1. Capacitor Suppliers
Supplier
Murata Erie
Sprague Electric
Phone Number
(814) 237-1431
(603) 224-1961
(207) 324-4140
Fax Number
(814) 238-0490
(603) 224-1430
(207) 324-7223
Capacitor
GRM42-6Z5U224M50
RPE123Z5U105M50V
595D475X9016A7
595D105X9016A7
*Note: (SM) denotes surface-mount component, (TH) denotes through-hole component.
Capacitor Type*
0.22µF Ceramic (SM)
1.0µF Ceramic (TH)
4.7µF Tantalum (SM)
1.0µF Tantalum (SM)
C2
0.22µF
VIN
4.75V TO 5.5V
C4
VOUT 4.7µF
+12V ±5%
AT 30mA
C5
4.7µF
3 C2-
C1+ 2
4
MAX662A
C2+
C1-
1
5 VCC
8
SHDN
6 VOUT
GND 7
C1
0.22µF
PROGRAMMING
CONTROL
DIRECT FROM
µP
Figure 3a. Flash EEPROM Programming Power Supply for
Commercial Temperature Range Applications
*C2
1.0µF
VIN
4.75V TO 5.5V
*C4
VOUT
+12V ±5%
AT 30mA
22µF
*C5
22µF
3 C2-
C1+ 2
4
MAX662A
C2+
C1-
1
5 VCC
8
SHDN
6 VOUT
GND 7
*C1
1.0µF
PROGRAMMING
CONTROL
DIRECT FROM
µP
*SPRAGUE 595D SERIES OR EQUIVALENT
Figure 3b. Flash EEPROM Programming Power Supply for
Extended and/or Military Temperature Range Applications
Layout Considerations
Layout is critical, due to the MAX662A’s high oscillator
frequency. Good layout ensures stability and helps
maintain the output voltage under heavy loads. For best
performance, use very short connections to the capaci-
tors. The order of importance is: C4, C5, C1, C2.
Flash EEPROM Applications
The circuit of Figure 3a is a +12V ±5% 30mA flash
EEPROM programming power supply. A microproces-
sor controls the programming voltage via the SHDN
pin. When SHDN is low, the output voltage (which is
connected to the flash memory VPP supply-voltage pin)
rises to +12V to facilitate programming the flash memo-
ry. When SHDN is high, the output voltage is connected
to VIN through an internal 1kΩ resistor.
Paralleling Devices
Two MAX662As can be placed in parallel to increase
output drive capability. The VCC, VOUT, and GND pins
can be paralleled, reducing pin count. Use a single
bypass capacitor and a single output filter capacitor
with twice the capacitance value if the two devices can
be placed close to each other. If the MAX662As cannot
be placed close together, use separate bypass and
output capacitors. The amount of output ripple
observed will determine whether single input bypass
and output filter capacitors can be used. Under certain
conditions, one device may supply the total output cur-
rent. Therefore, regardless of the number of devices in
parallel, the maximum continuous current must not
exceed 50mA.
12V and 20V Dual-Output Power Supply
Using the charge-pump voltage-doubler circuit of
Figure 4, the MAX662A can produce a +20V supply
from a single +5V supply. Figure 5 shows the current
capability of the +20V supply.
_______________________________________________________________________________________ 5
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