MAX1044 データシートの表示（PDF） - Maxim Integrated
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MAX1044 Datasheet PDF : 14 Pages
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MAX1044/ICL7660
Switched-Capacitor Voltage Converters
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
●● Hand-Held Instruments
●● Panel Meters
Typical Operating Circuit
CAP+
V+
MAX1044
ICL7660
CAP-
GND
VOUT
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
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
Ordering Information appears at end of data sheet.
Pin Configurations
TOP VIEW
+
(N.C.) BOOST 1
CAP+ 2
GND 3
MAX1044
ICL7660
CAP- 4
8 V+
7 OSC
6 LV
5 VOUT
DIP/SO/µMAX
V+ AND CASE
8
N.C.
OSC
1
7
CAP+ 2
ICL7660
6 LV
GND
3
( ) ARE FOR ICL7660
4
CAP-
TO-99
5 VOUT
NEGATIVE VOLTAGE CONVERTER
19-4667; Rev 2; 2/17
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