MAX662AMJA Maxim Integrated Products, MAX662AMJA Datasheet - Page 5

• Manufacturer Part Number: MAX662AMJA
• Description: Charge Pumps
• Manufacturer: Maxim Integrated Products

Specifications of MAX662AMJA

• Function: Step Up
• Output Voltage: 12 V
• Output Current: 30 mA
• Maximum Operating Temperature: + 125 C
• Package / Case: CDIP-8
• Minimum Operating Temperature: - 55 C
• Mounting Style: Through Hole
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Table 1. Capacitor Suppliers
*Note: (SM) denotes surface-mount component, (TH) denotes through-hole component.
Figure 3a. Flash EEPROM Programming Power Supply for
Commercial Temperature Range Applications
Figure 3b. Flash EEPROM Programming Power Supply for
Extended and/or Military Temperature Range Applications
Murata Erie
Sprague Electric
4.75V TO 5.5V
+12V ±5%
4.75V TO 5.5V
AT 30mA
+12V ±5%
AT 30mA
V
V
V
OUT
OUT
IN
V
Supplier
IN
0.22 F
1.0 F
22 F
4.7 F
22 F
4.7 F
*C2
*C5
*C4
C5
C2
C4
*SPRAGUE 595D SERIES OR EQUIVALENT
_______________________________________________________________________________________
3
4
5
6
3
4
5
6
C2-
C2+
V
V
C2-
C2+
V
V
CC
OUT
CC
OUT
MAX662A
MAX662A
Phone Number
[phone]
[phone]
[phone]
SHDN
SHDN
GND
GND
C1+
C1+
C1-
C1-
2
1
8
7
2
1
8
7
PROGRAMMING
CONTROL
DIRECT FROM
PROGRAMMING
CONTROL
DIRECT FROM
C1
0.22 F
*C1
1.0 F
P
P
[phone]
[phone]
[phone]
+12V, 30mA Flash Memory
Fax Number
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.
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 V
rises to +12V to facilitate programming the flash memo-
ry. When SHDN is high, the output voltage is connected
to V
Two MAX662As can be placed in parallel to increase
output drive capability. The V
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.
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.
IN
12V and 20V Dual-Output Power Supply
Programming Supply
through an internal 1kΩ resistor.
GRM42-6Z5U224M50
RPE123Z5U105M50V
595D475X9016A7
595D105X9016A7
Capacitor
Flash EEPROM Applications
Layout Considerations
CC
Paralleling Devices
, V
0.22µF Ceramic (SM)
1.0µF Ceramic (TH)
4.7µF Tantalum (SM)
1.0µF Tantalum (SM)
PP
OUT
supply-voltage pin)
Capacitor Type*
, and GND pins
5