MAX1044 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Switched-Capacitor Voltage Converters

19-4667; Rev 1; 7/94
Switched-Capacitor Voltage Converters
_______________General Description
The MAX1044 and ICL7660 are monolithic, CMOS
switched-capacitor voltage converters that invert, dou-
ble, 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 applica-
tions 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
Hand-Held Instruments
Panel Meters
__________Typical Operating Circuit
CAP+
V+
MAX1044
ICL7660
CAP-
V_OUT
GND
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
NEGATIVE VOLTAGE CONVERTER
____________________________Features
o Miniature µMAX Package
o 1.5V to 10.0V Operating Supply Voltage Range
o 98% Typical Power-Conversion Efficiency
o Invert, Double, Divide, or Multiply Input Voltages
o BOOST Pin Increases Switching Frequencies
(MAX1044)
o No-Load Supply Current: 200µA Max at 5V
o No External Diode Required for Higher-Voltage
Operation
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX1044CPA
0°C to +70°C
8 Plastic DIP
MAX1044CSA
0°C to +70°C
8 SO
MAX1044C/D
0°C to +70°C
Dice*
MAX1044EPA
-40°C to +85°C
8 Plastic DIP
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
_________________Pin Configurations
TOP VIEW
(N.C.) BOOST 1
CAP+ 2
GND 3
CAP- 4
MAX1044
ICL7660
8 V+
7 OSC
6 LV
5 V_OUT
DIP/SO/µMAX
V+ AND CASE
8
N.C.
OSC
1
7
CAP+ ₂
ICL7660
LV
6
GND
3
( ) ARE FOR ICL7660
4
CAP-
TO-99
5 ^VOUT
________________________________________________________________ Maxim Integrated Products 1
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