MAX660 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – Switched Capacitor Voltage Converter

19-3293; Rev. 2; 9/96
CMOS Monolithic Voltage Converter
_______________General Description
The MAX660 monolithic, charge-pump voltage inverter
converts 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 combined
with a typical operating current of only 120µA provides
ideal performance for both battery-powered and board-
level voltage conversion applications. The MAX660 can
also double the output voltage of an input power supply
or battery, providing +9.35V at 100mA from a +5V
input.
A frequency control (FC) pin selects either 10kHz typ or
80kHz typ (40kHz min) operation to optimize capacitor
size and quiescent current. The oscillator frequency
can also be adjusted with an external capacitor or
driven with an external clock. The MAX660 is a pin-
compatible, high-current upgrade of the ICL7660.
The MAX660 is available in both 8-pin DIP and small-
outline packages in commercial, extended, and military
temperature ranges.
For 50mA applications, consider the MAX860/MAX861
pin-compatible devices (also available in ultra-small
µMAX packages).
________________________Applications
Laptop Computers
Medical Instruments
Interface Power Supplies
Hand-Held Instruments
Operational-Amplifier Power Supplies
__________________Pin Configuration
TOP VIEW
FC 1
CAP+ ²
GND ³
CAP- ⁴
MAX660
DIP/SO
8 _V+
7 OSC
6 LV
5 _OUT
___________________________ Features
® Small Capacitors
® 0.65V Typ Loss at 100mA Load
® Low 120µA Operating Current
® 6.5Ω Typ Output Impedance
® Guaranteed ROUT < 15W for C1 = C2 = 10mF
® Pin-Compatible High-Current ICL7660 Upgrade
® Inverts or Doubles Input Supply Voltage
® Selectable Oscillator Frequency: 10kHz/80kHz
® 88% Typ Conversion Efficiency at 100mA
(I_L to GND)
______________Ordering Information
PART
TEMP. RANGE
MAX660CPA
0°C to +70°C
MAX660CSA
0°C to +70°C
MAX660C/D
0°C to +70°C
MAX660EPA
-40°C to +85°C
MAX660ESA
-40°C to +85°C
MAX660MJA
-55°C to +125°C
*Contact factory for dice specifications.
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
_________Typical Operating Circuits
C1
1µF to 150µF
C1
1µF to 150µF
+VIN
2.5V TO 5.5V
1 _FC
+VIN
1.5V TO 5.5V
V+ ⁸
2 _{CAP+ MAX660 OSC} 7
3 _GND
4
CAP-
LV ⁶
OUT ⁵
VOLTAGE INVERTER
INVERTED
NEGATIVE
VOLTAGE
OUTPUT
C2
1µF to 150µF
1 _FC
V+ ⁸
2 _{CAP+ MAX660 OSC} 7
3 _GND
LV ⁶
4 _CAP-
5
OUT
DOUBLED
POSITIVE
VOLTAGE
OUTPUT
C2
1µF to 150µF
POSITIVE VOLTAGE DOUBLER
________________________________________________________________ Maxim Integrated Products 1
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