ICL7660ESA Maxim Integrated Products, ICL7660ESA Datasheet - Page 11

• Manufacturer Part Number: ICL7660ESA
• Description: Charge Pumps Switched-Capacitor Voltage Converter
• Manufacturer: Maxim Integrated Products

Specifications of ICL7660ESA

• Function: Inverting, Step Up
• Output Voltage: - 1.5 V to - 10 V, 3 V to 20 V
• Output Current: 20 mA
• Maximum Operating Temperature: + 85 C
• Package / Case: SOIC-8 Narrow
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

Figure 14a-14c. Shutdown Schemes for MAX1044/ICL7660
Figure 13. Paralleling MAX1044/ICL7660 to Reduce Output
Resistance
10µF
C1
C1
a)
b)
c)
MAX1044
ICL7660
MAX1044
ICL7660
1
2
3
4
1
2
3
4
1
2
3
4
MAX1044
7
7
ICL7660
______________________________________________________________________________________
MAX1044
MAX1044
ICL7660
ICL7660
Switched-Capacitor Voltage Converters
1
n
V+
V+
8
7
6
5
8
7
6
5
8
7
6
5
V+
1N4148
10k REQUIRED FOR TTL
OUTPUT
ENABLE
74HC126 OR
74LS126
TRI-STATE BUFFER
74HC03
OPEN-DRAIN OR
74LS03
OPEN-COLLECTOR
NAND GATES
10µF
V+
C2
V
V
OUT
V+
OUT
CMOS or
TTL GATE
-(V+)
-(V+)
Paralleling multiple MAX1044/ICL7660s reduces output
resistance and increases current capability. As illus-
trated in Figure 13, each device requires its own pump
capacitor C1, but the reservoir capacitor C2 serves all
devices. The equation for calculating output resistance is:
Figures 14a–14c illustrate three ways of adding shut-
down capability to the MAX1044/ICL7660. When using
these circuits, be aware that the additional capacitive
loading on the OSC pin will reduce the oscillator fre-
quency. The first circuit has the least loading on the
OSC pin and has the added advantage of controlling
shutdown with a high or low logic level, depending on
the orientation of the switching diode.
* Contact factory for dice specifications.
** Contact factory for availability.
†
MAX1044ESA
MAX1044MJA
ICL7660CPA
ICL7660CSA
ICL7660CUA
ICL7660C/D
ICL7660EPA
ICL7660ESA
ICL7660AMJA
ICL7660AMTV
_Ordering Information (continued)
The Maxim ICL7660 meets or exceeds all “A” and “S”
specifications.
R
OUT
PART
R
†
†
OUT
n (number of devices)
(of MAX1044 or ICL7660)
-40°C to +85°C
-55°C to +125°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Shutdown Schemes
Paralleling Devices
PIN-PACKAGE
8 SO
8 CERDIP**
8 Plastic DIP
8 SO
8 µMAX
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
8 TO-99**
11