General Description
The MAX1044 and ICL7660 are monolithic, CMOS
switched-capacitor voltage converters that invert, double,
divide, or multiply a positive input voltage. They are
pin compatible with the industry-standard ICL7660 and
LTC1044. Operation is guaranteed from 1.5V to 10V with
no external diode over the full temperature range. They
deliver 10mA with a 0.5V output drop. The MAX1044 has
a BOOST pin that raises the oscillator frequency above
the audio band and reduces external capacitor size
requirements.
The MAX1044/ICL7660 combine low quiescent current and
high efficiency. Oscillator control circuitry and four power
MOSFET switches are included on-chip. Applications
include generating a -5V supply from a +5V logic supply
to power analog circuitry. For applications requiring more
power, the MAX660 delivers up to 100mA with a voltage
drop of less than 0.65V.
Applications
● -5V Supply from +5V Logic Supply
● Personal Communications Equipment
● Portable Telephones
● Op-Amp Power Supplies
● EIA/TIA-232E and EIA/TIA-562 Power Supplies
● Data-Acquisition Systems
● Handheld Instruments
● Panel Meters
Features
● Miniature μMAX Package
● 1.5V to 10.0V Operating Supply Voltage Range
● 98% Typical Power-Conversion Efficiency
● Invert, Double, Divide, or Multiply Input Voltages
● BOOST Pin Increases Switching Frequencies
(MAX1044)
● No-Load Supply Current: 200μA (max) at 5V
● No External Diode Required for Higher-Voltage
Operation
19-4667; Rev 3; 6/19
Ordering Information appears at end of data sheet.
NEGATIVE VOLTAGE CONVERTER
CAP+
CAP-
V+
V
OUT
GND
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
MAX1044
ICL7660
MAX1044
ICL7660
+
4
3
2
1
CAP-
GND
CAP+
(N.C.) BOOST
5
6
7
8
V
OUT
LV
OSC
V+
TOP VIEW
( ) ARE FOR ICL7660
DIP/SO/µMAX
TO-99
ICL7660
N.C.
CAP+
GND
CAP-
V
OUT
LV
OSC
V+ AND CASE
1
2
3
4
5
6
7
8
Typical Operating Circuit
Pin Congurations
MAX1044/ICL7660 Switched-Capacitor Voltage Converters
Click here for production status of specic part numbers.
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