CAT660
100mA CMOS Charge Pump Inverter/Doubler
FEATURES
s
Replaces MAX660 and LTC®660
s
Converts V+ to V- or V+ to 2V+
s
Low output resistance, 4
Ω
typical
s
High power efficiency
s
Selectable charge pump frequency
s
Low quiescent current
H
GEN
FR
ALO
EE
LE
A
D
F
R
E
E
TM
s
Pin-compatible, high-current alternative to
7660/1044
s
Industrial temperature range
s
Available in 8-pin SOIC and DIP packages
- 10kHz or 80kHz
- Optimize capacitor size
- Lead-free, halogen-free package option
APPLICATIONS
s
Negative voltage generator
s
Voltage doubler
s
Voltage splitter
s
Low EMI power source
s
GaAs FET biasing
s
Lithium battery power supply
s
Instrumentation
s
LCD contrast bias
s
Cellular phones, pagers
DESCRIPTION
The CAT660 is a charge-pump voltage converter. It will
invert a 1.5V to 5.5V input to a -1.5V to -5.5V output. Only
two external capacitors are needed. With a guaranteed
100mA output current capability, the CAT660 can replace
a switching regulator and its inductor. Lower EMI is
achieved due to the absence of an inductor.
In addition, the CAT660 can double a voltage supplied
from a battery or power supply. Inputs from 2.5V to 5.5V
will yield a doubled, 5V to 11V output voltage.
A Frequency Control pin (BOOST/FC) is provided to
select either a high (80kHz) or low (10kHz) internal
oscillator frequency, thus allowing quiescent current vs.
capacitor size trade-offs to be made. The 80kHz
frequency is selected when the FC pin is connected to
V+. The operating frequency can also be adjusted with
an external capacitor at the OSC pin or by driving OSC
with an external clock.
Both 8-pin DIP and SOIC packages are available in the
industrial temperature range.
The CAT660 replaces the MAX660 and the LTC660.
In addition, the CAT660 is pin compatible with the 7660/
1044, offering an easy upgrade for applications with
100mA loads.
TYPICAL APPLICATION
+VIN
1.5V to 5.5V
1
BOOST/FC
C1
+
V+
OSC
LV
OUT
8
7
6
5
Inverted
Negative
Output
Voltage
C1
+
1
BOOST/FC
2
CAP+
CAT660
V+
OSC
LV
OUT
8
7
6
5
Doubled
Positive
Output
Voltage
2
CAP+
3
GND
4
CAP-
CAT660
3
GND
4
CAP-
VIN = 2.5V to 5.5V
VOLTAGE INVERTER
POSITIVE
VOLTAGE DOUBLER
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-5000, Rev. W
CAT660
PIN CONFIGURATION
SOIC 8-Lead (V)
PDIP 8-Lead (L)
BOOST/FC 1
CAP+ 2
GND 3
CAP- 4
(Top View)
8 V+
CAT
660
7 OSC
6 LV
5 OUT
PIN DESCRIPTIONS
Circuit Configuration
Pin Number
Name
1
Boost/FC
Inverter Mode
Frequency Control for the internal oscilla-
tor. With an external oscillator BOOST/FC
has no effect.
Boost/FC Oscillator Frequency
Open
V+
2
3
4
5
6
CAP+
GND
CAP-
OUT
LV
10kHz typical, 5kHz minimum
80kHz typical, 40kHz minimum
Doubler Mode
Same as inverter.
Oscillator Frequency
10kHz typical
80kHz typical, 40kHz minimum
Same as inverter.
Power supply. Positive voltage input.
Same as inverter.
Power supply ground.
LV must be tied to OUT for all input
voltages.
Charge pump capacitor. Positive terminal.
Power supply ground.
Charge pump capacitor. Negative terminal.
Output for negative voltage.
Low-Voltage selection pin. When the input
voltage is less than 3V, connect LV to GND.
For input voltages above 3V, LV may be
connected to GND or left open. If OSC is
driven externally, connect LV to GND.
Oscillator control input. An external capacitor
can be connected to lower the oscillator
frequency. An external oscillator can drive
OSC and set the chip operating frequency.
The charge-pump frequency is one-half the
frequency at OSC.
Power supply. Positive voltage input.
7
OSC
Same as inverter. Do not overdrive
OSC in doubling mode. Standard logic
levels will not be suitable. See the
applications section for additional
information.
Positive voltage output.
8
V+
ORDERING INFORMATION
Part Number
CAT660ELA
CAT660EVA
CAT660EVA-T3
Package
PDIP, 8-lead
SOIC
SOIC
Quanity
50/tube
100/tube
3,000/reel
Package
Marking
660ELA
660EVA
660EVA
Note:
All packages are RoHS compliant.
Doc. No. MD-5000, Rev. W
2
CAT660
ABSOLUTE MAXIMUM RATINGS
V+ to GND ............................................................. 6V
Storage Temperature ......................... -65°C to 160°C
Input Voltage (Pins 1, 6 and 7) .. -0.3V to (V+ + 0.3V)
BOOST/FC and OSC Input Voltage ........... The least
negative of (Out - 0.3V) or (V+ - 6V) to (V+ + 0.3V)
Output Short-circuit Duration to GND .............. 1 sec.
(OUT may be shorted to GND for 1 sec without damage but
shorting OUT to V+ should be avoided.)
Lead Soldering Temperature (10 sec) ............. 300°C
Note: T
A
= Ambient Temperature
These are stress ratings only and functional operation is not
implied. Exposure to absolute maximum ratings for prolongued
time periods may affect device reliability. All voltages are with
respect to ground.
Operating Ambient Temperature Range
CAT660E .............. -40°C to 85°C
Continuous Power Dissipation (T
A
= 70°C)
Plastic DIP ................................................ 730mW
SOIC ......................................................... 500mW
TDFN ............................................................... 1W
ELECTRICAL CHARACTERISTICS
V+ = 5V, C1 = C2 = 150µF, Boost/FC = Open, C
OSC
= 0pF, inverter mode with test circuit as shown in Figure 1 unless
otherwise noted. Temperature is over operating ambient temperature range unless otherwise noted.
Parameter
Supply Voltage
Supply Current
Output Current
Output Resistance
Symbol
VS
IS
IOUT
RO
Conditions
Inverter: LV = Open. R
L
= 1kΩ
Inverter: LV = GND. R
L
= 1kΩ
Doubler: LV = OUT. R
L
= 1kΩ
BOOST/FC = open, LV = Open
BOOST/FC = V+ , LV = Open
OUT is more negative than -4V
I
L
= 100mA, C1 = C2 = 150
µF
(Note 2)
BOOST/FC = V+ (C1, C2 ESR
≤
0.5Ω)
I
L
= 100mA, C1 = C2 = 10
µF
Oscillator Frequency FOSC
(Note 3)
OSC Input Current
Power Efficiency
IOSC
PE
BOOST/FC = Open
BOOST/FC = V+
BOOST/FC = Open
BOOST/FC = V+
R
L
= 1kΩ connected between V+ and
OUT, T
A
= 25
°
C (Doubler)
R
L
= 500Ω connected between GND and
OUT, T
A
= 25
°
C (Inverter)
I
L
= 100mA to GND, T
A
= 25
°
C (Inverter)
Voltage Conversion
Efficiency
Note 1. In Figure 1, test circuit capacitors C1 and C2 are 150µF and have 0.2Ω maximum ESR. Higher ESR levels may reduce efficiency and output
voltage.
Note 2. The output resistance is a combination of the internal switch resistance and the external capacitor ESR. For maximum voltage and efficiency
keep external capacitor ESR under 0.2Ω.
Note 3. FOSC is tested with C
OSC
= 100pF to minimize test fixture loading. The test is correlated back to C
OSC
=0pF to simulate the capacitance
at OSC when the device is inserted into a test socket without an external C
OSC
.
Min
3.0
1.5
2.5
Typ
Max
5.5
5.5
5.5
Units
V
0.09
0.3
100
4
0.5
3
mA
mA
7
Ω
12
5
40
10
80
±1
±5
kHz
µA
%
96
92
98
96
88
VEFF
No load, T
A
= 25
°
C
99
99.9
%
3
Doc. No. MD-5000, Rev. W
CAT660
Figure 1. Test Circuit
V+
1
2
+
C1
150µF
BOOST/FC
CAP+
GND
CAP-
V+
OSC
LV
OUT
8
7
6
5
IS
V+
5V
External
Oscillator
COSC
RL
IL
VOUT
3
4
CAT660
Voltage Inverter
C2
+ 150µF
TYPICAL OPERATING CHARACTERISTICS
Typical characteristic curves are generated using the test circuit in Figure 1. Inverter test conditions are: V+=5V, LV
= GND, BOOST/FC = Open and T
A
= 25˚C unless otherwise indicated. Note that the charge-pump frequency is one-
half the oscillator frequency.
Supply Current vs. Input Voltage
150
Supply Current vs. Temperature (no load)
120
VIN = 5V
INPUT CURRENT [ A] .
120
90
60
30
0
1
2
3
4
5
INPUT VOLTAGE [V]
6
No Load
INPUT CURRENT [ A]
100
80
60
40
20
0
-50 -25
VIN = 3V
VIN = 2V
0
25
50
75
100 125
Output Resistance vs. Input Voltage
OUTPUT RESISTANCE [ ] .
10
8
6
4
2
0
1
2
3
4
5
INPUT VOLTAGE [V]
6
Output Resistance vs. Temperature (50
Ω
load)
8
7
6
100
Load
VIN = 2V
5
VIN = 3V
4
3
2
-50
-25
0
25
50
75
100
125
VIN = 5V
Doc. No. MD-5000, Rev. W
4
CAT660
TYPICAL OPERATING CHARACTERISTICS
Inverted Output Voltage vs. Load, V+ = 5V
Output Voltage Drop vs. Load Current
1.0
INV. OUTPUT VOLTAGE [V] .
5.0
OUTPUT VOLTAGE [V]
4.8
4.6
4.4
4.2
4.0
0
20
40
60
80
100
LOAD CURRENT [mA]
0.8
0.6
0.4
0.2
V+ = 5V
0.0
0
20
40
60
80
100
LOAD CURRENT [mA]
V+ = 3V
Oscillator Frequency vs. Supply Voltage
20
18
16
14
12
10
8
6
4
2
0
2
Oscillator Frequency vs. Supply Voltage
200
FREQUENCY [kHz] .
FREQUENCY [kHz]
LV = OPEN
150
LV = GND
LV = GND
100
LV = OPEN
50
BOOST = +V
BOOST = OPEN
0
3
4
5
SUPPLY VOLTAGE [V]
6
2
3
4
5
SUPPLY VOLTAGE [V]
6
Supply Current vs. Oscillator Frequency
10000
INPUT CURRENT [uA]
No Load
1000
V+ = 5V
100
10
1
10
100
1000
OSCILLATOR FREQUENCY [kHz]
5
Doc. No. MD-5000, Rev. W
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