MAX1044/ICL7660
General Description
Switched-Capacitor Voltage Converters
Features
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.
● 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
appears at end of data sheet.
Pin Configurations
TOP VIEW
Applications
●
●
●
●
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-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
Hand-Held Instruments
Panel Meters
+
(N.C.) BOOST
CAP+
GND
CAP-
1
2
3
4
8
V+
OSC
LV
V
OUT
MAX1044
ICL7660
7
6
5
Typical Operating Circuit
N.C.
CAP+
V+
INPUT
SUPPLY
VOLTAGE
CAP+
2
1
DIP/SO/µMAX
V+ AND CASE
8
7
OSC
MAX1044
ICL7660
CAP-
V
OUT
GND
ICL7660
6
LV
GND
NEGATIVE
OUTPUT
VOLTAGE
3
4
5
V
OUT
( ) ARE FOR ICL7660
CAP-
TO-99
NEGATIVE VOLTAGE CONVERTER
19-4667; Rev 2; 2/17
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
