Impala Linear Corporation
ILC6660
General Description
The ILC6660 monolithic, charge-pump voltage inverter con-
verts a +1.5V to +5.5V input to a corresponding -1.5V to -5.5V
output. Using only two low-cost capacitors, the charge pump's
100mA output replaces switching regulators, eliminating
inductors and their associated cost, size, and EMI. Greater
than 90% efficiency over most of its load-current range com-
bined with a typical operating current of only 120µA provides
ideal performance for both battery-powered and board-level
voltage conversion applications. The ILC6660 can also dou-
ble or split the output voltage of an input powered supply or
battery, providing +9.5V or +2.3V at 100mA from a +5V input.
A frequency control (FC) pin selects either 5kHz typ or 50kHz
typ (30kHz min) operation to optimize capacitor size and qui-
escent current. The Oscillator frequency can also be driven
with an external clock. The ILC6660 is available in both 8-pin
DIP and small-outline packages in commercial and extended
temperature ranges.
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Advance
CMOS Monolithic Voltage Converter
Features
0.5V Typ Loss at 100mA Load
Low 120µA Operating Current
5.0Ω Typ Output Impedance
Guaranteed R
OUT
< 10Ω for C1 = C2 = 100µF
Inverts, Doubles or Splits Input Supply Voltage
Selectable Oscillator Frequency: 5kHz/50kHz
90% Typ Conversion Efficiency at 100mA l
OUT
8-pin SOIC package.
Applications
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Laptop Computers
Medical Instruments
Interface Power Supplies
Hand-Held Instruments
Operational-Amplifier Power Supplies
Typical Circuits
+V
IN
1.5V to 5.5V
1
2
C1
100µF
to 470µF
FC
CAP+
V+
SYNC
8
7
6
5
R
L
C2
100µF
to 470µF
Ordering Information* T
A
= 40°C to = 85°C
INVERTED
NEGATIVE
VOLTAGE
OUTPUT
+
3
4
ILC6660
VSS
CAP-
LV
ILC6660IK
8-pin SOIC
VSH
VOLTAGE INVERTER
1
1
C1
100µF
to 470µF
+V
IN
2.5 TO 5.5V
FC
CAP+
V+
SYNC
8
7
6
FC
CAP+
V+
SYNC
8
7
6
5
V
IN
2.5V to 5.5V
2
+
+
3
4
ILC6660
VSS
CAP-
LV
VSH
C2
100µF
to 470µF
C1
100µF
to 470µF
2
+
3
ILC6660
VSS
CAP-
LV
5
DOUBLED
POSITIVE
VOLTAGE
OUTPUT
SPLIT
POSITIVE
VOLTAGE
OUTPUT
4
+
VSH
C2
100µF
to 470µF
POSITIVE VOLTAGE DOUBLER
POSITIVE VOLTAGE SPLITTER
Impala Linear Corporation
ILC6660 1.8
(408) 574-3939
www.impalalinear.com
May 2000
1
IMPALA [ Impala Linear Corporation ]
