Rainbow Electronics MAX660 - Manual

MAX660
CMOS Monolithic Voltage Converter
________________________________________________________________ Maxim Integrated Products 1
19-3293; Rev. 2; 9/96
_______________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
___________________________ Features
♦ Small Capacitors
♦ 0.65V Typ Loss at 100mA Load
♦ Low 120µA Operating Current
♦ 6.5Ω Typ Output Impedance
♦ Guaranteed R
OUT < 15 Ω for C1 = C2 = 10µF
♦ 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)
1
2
3
2
1
3
4
7
8
5
6
8
7
6
5
MAX660
MAX660
FC
CAP+
GND
CAP-
V+
OSC
LV
OUT
FC
CAP+
GND
CAP-
V+
OSC
LV
OUT
C2
1
µF to 150µF
VOLTAGE INVERTER
POSITIVE VOLTAGE DOUBLER
+V IN
1.5V TO 5.5V
INVERTED
NEGATIVE
VOLTAGE
OUTPUT
C1
1 µF to 150µF
DOUBLED
POSITIVE
VOLTAGE
OUTPUT
C2
1
µF to 150µF
C1
1 µF to 150µF
+V
IN
2.5V TO 5.5V
4
_________Typical Operating Circuits
1
2
3
4
8
7
6
5
V+
OSC
LV
OUT CAP-
GND
CAP+
FC
MAX660
DIP/SO
TOP VIEW
__________________Pin Configuration
______________Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX660CPA 0°C to +70°C 8 Plastic DIP
MAX660CSA 0°C to +70°C 8 SO
MAX660C/D 0°C to +70°C Dice*
MAX660EPA -40°C to +85°C 8 Plastic DIP
MAX660ESA -40°C to +85°C 8 SO
*Contact factory for dice specifications.
MAX660MJA -55°C to +125°C 8 CERDIP
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800