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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1044 Datasheet

Switched-Capacitor Voltage Converters

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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
N.C. 8 OSC
17
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


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1044 Datasheet

Switched-Capacitor Voltage Converters

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MAX1044/ICL7660
Switched-Capacitor Voltage Converters
Absolute Maximum Ratings
Supply Voltage (V+ to GND, or GND to VOUT)..................10.5V
Input Voltage on Pins 1, 6, and 7........ -0.3V ≤ VIN ≤ (V+ + 0.3V)
LV Input Current...................................................................20μA
Output Short-Circuit Duration (V+ ≤ 5.5V).................Continuous
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C).............727mW
SO (derate 5.88mW/°C above +70°C).........................471mW
μMAX (derate 4.1mW/°C above +70°C)......................330mW
CERDIP (derate 8.00mW/°C above +70°C).................640mW
TO-99 (derate 6.67mW/°C above +70°C)....................533mW
Operating Temperature Ranges
MAX1044C_ _ /ICL7660C_ _..............................0°C to +70°C
MAX1044E_ _ /ICL7660E_ _.......................... -40°C to +85°C
MAX1044M_ _ /ICL7660M_ _....................... -55°C to +125°C
Storage Temperature Range............................ -65°C to + 150°C
Lead Temperature (soldering, 10sec).............................. +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(Circuit of Figure 1, V+ = 5.0V, LV pin = 0V, BOOST pin = open, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
Supply Current
Supply Voltage
Range (Note 1)
Output Resistance
Oscillator Frequency
Power Efficiency
Voltage Conversion Efficiency
Oscillator Sink or
Source Current
Oscillator Impedance
CONDITIONS
RL = ∞,
pins 1 and 7
TA = +25°C
TA = 0°C to +70°C
no connection,
LV open
TA = -40°C to +85°C
TA = -55°C to +125°C
RL = ∞, pins 1 and 7 = V+ = 3V
RL = 10kΩ, LV open
RL = 10kΩ, LV to GND
IL = 20mA,
fOSC = 5kHz,
LV open
TA = +25°C
TA = 0°C to +70°C
TA = -40°C to +85°C
TA = -55°C to +125°C
fOSC = 2.7kHz (ICL7660),
fOSC = 1kHz (MAX1044),
V+ = 2V, IL = 3mA,
LV to GND
TA = +25°C
TA = 0°C to +70°C
TA = -40°C to +85°C
TA = -55°C to +125°C
COSC = 1pF,
LV to GND (Note 2)
V+ = 5V
V+ = 2V
RL = 5kΩ, TA = +25°C, fOSC 5kHz, LV open
RL = ∞, TA = +25°C, LV open
VOSC = 0V or V+,
LV open
Pin 1 = 0V
Pin 1 = V+
TA = +25°C
V+ = 2V
V+ = 5V
MAX1044
MIN TYP MAX
30 200
200
200
200
10
1.5 10
65 100
130
130
150
325
325
325
400
5
1
95 98
97.0 99.9
3
20
1.0
100
ICL7660
MIN TYP MAX
80 175
225
250
250
3.0 10.0
1.5 3.5
55 100
120
140
150
250
300
300
400
10
95 98
99.0 99.9
1.0
100
UNITS
µA
V
kHz
%
%
µA
MΩ
kΩ
Note 1: The Maxim ICL7660 and MAX1044 can operate without an external output diode over the full temperature and voltage
ranges. The Maxim ICL7660 can also be used with an external output diode in series with pin 5 (cathode at VOUT) when
replacing the Intersil ICL7660. Tests are performed without diode in circuit.
Note 2: fOSC is tested with COSC = 100pF to minimize the effects of test fixture capacitance loading. The 1pF frequency is
correlated to this 100pF test point, and is intended to simulate pin 7’s capacitance when the device is plugged into a
test socket with no external capacitor. For this test, the LV pin is connected to GND for comparison to the original
manufacturer’s device, which automatically connects this pin to GND for (V+ > 3V).
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX1044
Description Switched-Capacitor Voltage Converters
Maker Maxim
Total Page 14 Pages
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