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MAX662A View Datasheet(PDF) - Maxim Integrated

Part Name
Description
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MAX662A Datasheet PDF : 6 Pages
1 2 3 4 5 6
+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 1kresistor.
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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