ICL7660CBAZ-T Intersil, ICL7660CBAZ-T Datasheet - Page 8
ICL7660CBAZ-T
Manufacturer Part Number
ICL7660CBAZ-T
Description
IC VOLTAGE CONVERTER CMOS 8-SOIC
Manufacturer
Intersil
Type
Switched Capacitor (Charge Pump), Invertingr
Datasheet
1.ICL7660CBAZA-T.pdf
(11 pages)
Specifications of ICL7660CBAZ-T
Package / Case
8-SOIC (3.9mm Width)
Mounting Type
Surface Mount
Voltage - Input
1.5 ~ 10 V
Operating Temperature
0°C ~ 70°C
Number Of Outputs
1
Internal Switch(s)
Yes
Frequency - Switching
10kHz
Synchronous Rectifier
No
Package
8SOIC N
Function
Inverting/Step Up
Output Voltage
-1.5 to -10|18.6(Max) V
Output Current
45(Max) mA
Rohs Compliant
YES
Peak Reflow Compatible (260 C)
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Voltage - Output
-
Power - Output
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ICL7660CBAZ-T
Manufacturer:
INTERSIL
Quantity:
7 500
Part Number:
ICL7660CBAZ-T
Manufacturer:
INTERSIL
Quantity:
20 000
Typical Applications
Simple Negative Voltage Converter
The majority of applications will undoubtedly utilize the ICL7660
and ICL7660A for generation of negative supply voltages.
Figure 13 shows typical connections to provide a negative
supply negative (GND) for supply voltages below 3.5V.
The output characteristics of the circuit in Figure 13A can be
approximated by an ideal voltage source in series with a
resistance as shown in Figure 13B. The voltage source has
a value of -V+. The output impedance (R
the ON resistance of the internal MOS switches (shown in
Figure 12), the switching frequency, the value of C
and the ESR (equivalent series resistance) of C1 and C2. A
good first order approximation for R
R
O
≅
2(R
2(R
SW1
SW2
10µF
+ R
+ R
C
SW4
+
SW3
1
-
V
-(V+)
+ ESR
+ ESR
0
8
FIGURE 16. CASCADING DEVICES FOR INCREASED OUTPUT VOLTAGE
C1
C1
) +
) +
O
1
2
3
4
1
2
3
4
is:
O
ICL7660A
ICL7660A
ICL7660
B
ICL7660
) is a function of
“1”
“1”
FIGURE 15. PARALLELING DEVICES
1
A
FIGURE 14. OUTPUT RIPPLE
ICL7660, ICL7660A
and C
8
7
6
5
8
7
6
5
t
2
10µF
V+
2
10µF
,
V+
+
-
C
+
-
1
RSW, the total switch resistance, is a function of supply
voltage and temperature (See the Output Source Resistance
graphs), typically 23Ω at 25°C and 5V. Careful selection of
C
output impedance. High value capacitors will reduce the
1/(f
lower the ESR term. Increasing the oscillator frequency will
reduce the 1/(f
of a net increase in output impedance when C
there is no longer enough time to fully charge the capacitors
(f
Combining the four R
1
PUMP
t
1
1
2
3
4
PUMP
and C
1
2
3
4
R
R
O
O
ICL7660A
=
ICL7660A
ICL7660
ICL7660
≅
≅
2
• C
“n”
“n”
2(R
will reduce the remaining terms, minimizing the
(f
1
PUMP
2 (R
) component, and low ESR capacitors will
SW1
PUMP
f
OSC
SW
1
2
+ R
) (C1)
8
7
6
5
10µF
8
7
6
5
SWX
) +
• C1) term, but may have the side effect
SW3
C
+
-
terms as R
2
+
-
+ ESR
, R
(f
+ ESR
PUMP
SWX
1
V
C2
C1
) (C1)
OUT
= MOSFET switch resistance)
SW
) +
, we see that:
=
R
L
-
nV+
+ 4 (ESR
1
C1
> 10µF and
October 10, 2005
) + ESR
FN3072.7
C2