Ordering Information* T
A
= 40C to = 85C
ILC6660IK
8-pin SOIC
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 120A 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.
ILC6660
CMOS Monolithic Voltage Converter
Impala Linear Corporation
Impala Linear Corporation
1
(408) 574-3939
www.impalalinear.com
May 2000
ILC6660 1.8
Advance
+
INVERTED
NEGATIVE
VOLTAGE
OUTPUT
1
2
3
4
8
7
6
5
FC
CAP+
ILC6660
VSS
CAP-
+V
IN
1.5V to 5.5V
SYNC
LV
VSH
VOLTAGE INVERTER
V+
C2
100F
to 470F
C1
100F
to 470F
R
L
0.5V Typ Loss at 100mA Load
Low 120A Operating Current
5.0
Typ Output Impedance
Guaranteed R
OUT
< 10
for C1 = C2 = 100F
Inverts, Doubles or Splits Input Supply Voltage
Selectable Oscillator Frequency: 5kHz/50kHz
90% Typ Conversion Efficiency at 100mA l
OUT
8-pin SOIC package.
Laptop Computers
Medical Instruments
Interface Power Supplies
Hand-Held Instruments
Operational-Amplifier Power Supplies
+V
IN
2.5 TO 5.5V
100F
to 470F
C1
+
DOUBLED
POSITIVE
VOLTAGE
OUTPUT
1
2
3
4
8
7
6
5
FC
CAP+
ILC6660
VSS
CAP-
SYNC
LV
VSH
POSITIVE VOLTAGE DOUBLER
V+
+
C2
100F
to 470F
General Description
Features
Applications
Typical Circuits
+
SPLIT
POSITIVE
VOLTAGE
OUTPUT
1
2
3
4
8
7
6
5
FC
CAP+
ILC6660
VSS
CAP-
V
IN
2.5V to 5.5V
SYNC
LV
VSH
POSITIVE VOLTAGE SPLITTER
V+
C1
100F
to 470F
C2
100F
to 470F
+
CMOS Monolithic Voltage Converter
Impala Linear Corporation
2
(408) 574-3939
www.impalalinear.com
May 2000
ILC6660 1.8
Advance
1
2
3
4
8
7
6
5
FC
CAP+
VSS
CAP-
VSH
LV
SYNC
V+
SOIC
ILC6660
Pin-Package Configurations
Pin Functions ILC6660
Pin
Number
Pin
Name
Inverter
Splitter
Doubler
1
FC
Frequency Control for Internal Oscillator,
FC open, f
OSC
=5kHz typ; FC = V+, f
OSC
=
50kHz typ.
FC has no effect when SYNC pin is driven
externally.
Same as Inverter
Same as Inverter
2
CAP+
Charge-Pump Capacitor, Positive Terminal
Same as Inverter
Same as Inverter
3
VSS
Power-Supply Ground Input
Power-Supply
PositiveVoltage Output
Power-Supply
Positive Voltage Input
4
CAP-
Charge-Pump Capacitor, Negative Terminal
Same as Inverter
Same as Inverter
5
VSH
Output, Negative Voltage
Power-Supply Ground
Input
Power-Supply Ground
Input
6
LV
Low-Voltage Operation Input. Tie LV to VSS
when input voltage is less than 2V. Above
2V, LV must be left open.
LV must be left open for
all input voltages
LV must be left open
for all input voltages.
7
SYNC
Oscillator Control Input. SYNC is connected
to an internal 15pF capacitor. An external
Oscillator may be connected to overdrive
SYNC via a 2...5nF capacitor.
SYNC shall not be connected to ground.
Same as inverter,
however, do not use
SYNC in voltage-
splitting mode
Same as inverter,
however, do not use
SYNC in voltage-
doubling mode.
8
V+
Power-Supply Positive Voltage Input
Positive Voltage Input
Positive Voltage
Output
Parameter
Operating Supply Voltage
Supply Current
Output Current
Output Resistance (Note 4)
Oscillator Frequency
Power Efficiency
Voltage-Conversion Efficiency
Symbol
V
IN
I
IN
I
VSH
R
VSH
f
OSC
Conditions
R
L
= 1k
, LV open
R
L
= 1k
, LV = VSS
R
L
= 1k
, LV open Doubler or Splitter
VSH = open, FC + open, LV = open
VSH = open , FC = V+, LV = open
VSH more negative than -4V
I
L
= 100mA
FC = open
FC = V+
R
L
= 1k
, connected between V+ and VSH
R
L
= 500
, between VSH and VSS
I
L
= 100mA
No load
Min
3.0
1.5
2
100
2.5
30
96
92
99.00
Typ
120
1
5.0
5.0
50
98
96
90
99.96
Max
5.5
2
5.5
300
2
10
10.0
90.0
Units
V
V
A
mA
mA
kHZ
kHZ
%
%
%
%
Ratings
+6
VSH -0.3 to V+ +0.3
120
Not internally protected
470
-40 to +85
150
-40 to +125
300
138
Parameter
Supply Voltage (V+ to VSS, or VSS to VSH)
LV, FC and OSC Input Voltage
VSH and V+ Continues Output Current
Output Short-Circuit Durations to GND (Note 2)
Continuous Power Dissipation (T = +85C)
Operation Temperature Ranges
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (soldering, 10sec)
Package Thermal Resistance
CMOS Monolithic Voltage Converter
Impala Linear Corporation
3
(408) 574-3939
www.impalalinear.com
May 2000
ILC6660 1.8
Advance
Symbol
V
IN
V
IN
I
VSH
I
SC
P
D
T
A
T
J(max)
T
stg
JA
Units
V
V
mA
A
mW
C
C
C
C
C/W
Note 1. Absolute maximum ratings indicate limits which, when exceeded, may result in damage to the component. Electrical specifications do not apply
when operating the device outside its rated operating conditions.
Note 2. VSH must not be shorted to VSS or V+, even instantaneously, or device damage may result.
Unless otherwise specified, all limits are at T
A
= 25C; V+ = 5V, C1 = C2 = 100F, test circuit of Figure 1, FC = open.
Boldface limits apply over the operating temperature range. (Note 3)
Note 3. Specified min/max limits are production tested or guaranteed through correlation based on statistical control methods.
Note 4. Specified output resistance is a combination of internal switch resistance and capacitor ESR.
Absolute Maximum Ratings (Note 1)
Electrical Characteristics ILC6660IK
FC
Open
FC = V+
Open
SYNC
Open
Open
External
Clock
Oscillator Frequency
5kHz
50kHz
External Clock
Frequency
CMOS Monolithic Voltage Converter
Impala Linear Corporation
4
(408) 574-3939
www.impalalinear.com
May 2000
ILC6660 1.8
Advance
The ILC6660 capacitive charge-pump circuit either
inverts, splits or doubles the input voltage (see Typical
Circuits). For highest performance, low effective series
resistance (ESR) capacitors should be used (see
Capacitor Selection section for more details). When using
the inverting mode with a supply voltage less than 2V, LV
may be connected to VSS. This bypasses the internal
regulator circuitry and provides best performance in low-
voltage applications. When using the inverter mode with
a supply voltage above 2V, LV must be left open.
Negative Voltage Converter
The most common application of the ILC6660 is as a
charge-pump voltage inverter. The operating circuit uses
only two external capacitors, C1 and C2 (see Typical
Circuits). Even though its output is not actively regulated,
the ILC6660 is very insensitive to load current changes. A
typical output source resistance of 5
means that with an
input of +5V the output voltage is -5V under light load, and
decreases only to 4.5V with a load of 100mA.
Capacitors selection
Low ESR capacitors should be used at the output of
ILC6660 to minimize output ripple. This can be achieved
using ceramic capacitors, but may also be met with certain
types of tantalum capacitors.
Output ripple voltage is calculated taking into account that
the output current is solely supplied from capacitor C2 dur-
ing one-half of the charge-pump cycle. This introduces a
peak-to-peak ripple of:
V RIPPLE = I VSH + I VSH (ESRC2)
2(f PUMP)(C2)
For a nominal fPUMP of 5kHz and C2 = 100F with an
ESR of 0.05
, ripple is approximately 100mV with a
100mA load current. If C2 is raised to 470F, the ripple
drops to approximately 25mV.
Positive Voltage Doubler
The ILC6660 operates in the voltage-doubling mode as
shown in the Typical Circuit. The no-load output is 2 x V
IN
.
Positive Voltage Splitter
The ILC6660 operates in voltage splitting mode as shown in
the Typical Circuit. The no-load output is V
IN
/2
Changing Oscillator Frequency
Three modes control the ILC6660's clock frequency,
as listed below:
When FC and SYNC are unconnected (open), the
Oscillator runs at 5kHz typically. When FC is connected to
V+, the charge and discharge current change from 1.0A
to 10.0A, thus increasing the Oscillator frequency 10
times. In the inverter mode, SYNC may also be overdriv-
en by an external clock source. A square wave signal of
maximum 2V peak-to-peak may be applied to SYNC via
a 2...5nF capacitor to overdrive the internal oscillator.
When SYNC is overdriven, FC has no effect. In some
applications, the 5kHz output ripple frequency may be low
enough to interfere with other circuitry. If desired, the
Oscillator frequency can then be increased through use of
the FC pin or an external Oscillator as described above.
Increasing the clock frequency increases the ILC6660's
quiescent current, but also allows smaller capacitance val-
ues to be used for C1 and C2.
Applications Information
Detailed Description
+
1
2
3
4
8
7
6
5
FC
CAP+
ILC6660
VSS
CAP-
SYNC
LV
VSH
V+
C2
C1
R
L
V+
+
V+ (5V)
N/C
Figure 1: Test Circuit
CMOS Monolithic Voltage Converter
Impala Linear Corporation
5
(408) 574-3939
www.impalalinear.com
May 2000
ILC6660 1.8
Advance
M Package, 8-Pin Small-Outline
0.260
0.240
0.019
0.013
0.260
0.240
0.260
0.240
0.260
0.240
0.260
0.240
0.260
0.240
0.260
0.240
0.260
0.240
Pin 1 identifier
0.197
0.190
0.155
0.150
0.244
0.228
0.069
0.053
0.011
0.004
0.060
0.040
0.019
0.013
0.050
0.016
0.012
0.009
0.8
Devices sold by Impala Linear Corporation are covered by the warranty and patent indemnification provisions appearing
in its Terms of Sale only. Impala Linear Corporation makes no warranty, express, statutory, implied, or by description
regarding the information set forth herein or regarding the freedom of the described devices from patent infringement.
Impala Linear Corporation makes no warranty of merchantability or fitness for any purpose. Impala Linear Corporation
reserves the right to discontinue production and change specifications and prices at any time and without notice.
This product is intended for use in normal commercial applications. Applications requiring an extended temperature
range, unusual environmental requirements, or high reliability applications, such as military and aerospace, are specif-
ically not recommended without additional processing by Impala Linear Corporation.
Impala Linear Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in an
Impala Linear Corporation product. No other circuits, patents, licenses are implied.
Life Support Policy
Impala Linear Corporation's products are not authorized for use as critical components in life support devices or systems.
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use pro-
vided in the labeling, can be reasonably expected to result in a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
Packaging Information
N Package, 8-Pin Dual In-Line
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