MAX660MJA/883B Maxim Integrated Products, MAX660MJA/883B Datasheet - Page 9

• Manufacturer Part Number: MAX660MJA/883B
• Description: Charge Pumps
• Manufacturer: Maxim Integrated Products

Specifications of MAX660MJA/883B

• Function: Inverting, Step Up
• Output Voltage: - 1.5 V to - 5.5 V
• Output Current: 100 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

This dual function is illustrated in Figure 5. In this cir-
cuit, capacitors C1 and C3 perform the pump and
reservoir functions respectively for generation of the
negative voltage. Capacitors C2 and C4 are respec-
tively pump and reservoir for the multiplied positive
voltage. This circuit configuration, however, leads to
higher source impedances of the generated supplies.
This is due to the finite impedance of the common
charge-pump driver.
Figure 5. Combined Positive Multiplier and Negative Converter
C1
Combined Positive Supply Multiplication
2
3
4
and Negative Voltage Conversion
MAX660
C3
_______________________________________________________________________________________
8
5
6
+V
IN
CMOS Monolithic Voltage Converter
D1
D2
D1, D2 = 1N4148
C2
C4
V
V
(V
OUT
OUT
FD1
) - (V
= -V
= (2V
IN
FD2
IN
) -
)
Figure 6. MAX660 generates a +5V regulated output from a 3V
lithium battery and operates for 16 hours with a 40mA load.
150µF
NOTE: ALL 150µF CAPACITORS ARE MAXC001, AVAILABLE FROM MAXIM.
3V LITHIUM BATTERY
DURACELL DL123A
3
2
4
MAX660
1M
5
8
6
150
µF
8
IN
MAX667
GND SHDN
LBI
4
OPEN-DRAIN
LOW-BATTERY OUTPUT
OUT
LBO
SET
DD
5
2
7
6
1
1M
1M
620k
220k
5V/100mA
150µF
9