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Maxim Integrated Semiconductor Electronic Components Datasheet


MAX1044

Switched-Capacitor Voltage Converters



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MAX1044 pdf
AVAILABLE
MAX1044/ICL7660
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
Functional Diagrams
__________Typical Operating Circuit
CAP+
INPUT
V+ SUPPLY
VOLTAGE
MAX1044
ICL7660
CAP-
NEGATIVE
VOUT OUTPUT
VOLTAGE
GND
Pin Configurations appear at end of data sheet.
FunctionalNDEiGagArTaImVsEcVoOnLtiTnAueGdEaCt OenNdVoEfRdTaEtaRsheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
____________________________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
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 VOUT
DIP/SO/µMAX
V+ AND CASE
8
N.C. OSC
17
CAP+ 2
ICL7660
LV
6
GND
3
( ) ARE FOR ICL7660
4
CAP-
TO-99
5 VOUT
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4667; Rev 1; 7/94



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MAX1044 pdf
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
CONDITIONS
Supply Current
RL = ,
pins 1 and 7
no connection,
LV open
TA = +25°C
TA = 0°C to +70°C
TA = -40°C to +85°C
TA = -55°C to +125°C
RL = , pins 1 and 7 = V+ = 3V
Supply Voltage
Range (Note 1)
RL = 10kΩ, LV open
RL = 10kΩ, LV to GND
Output Resistance
IL = 20mA,
fOSC = 5kHz,
LV open
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
TA = +25°C
TA = 0°C to +70°C
TA = -40°C to +85°C
TA = -55°C to +125°C
Oscillator Frequency
COSC = 1pF,
LV to GND (Note 2)
V+ = 5V
V+ = 2V
Power Efficiency
Voltage Conversion Efficiency
Oscillator Sink or
Source Current
RL = 5kΩ, TA = +25°C, fOSC 5kHz, LV open
RL = , TA = +25°C, LV open
Pin 1 = 0V
VOSC = 0V or V+, LV open Pin 1 = V+
Oscillator Impedance
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
UNITS
µA
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
V
Ω
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 correlat-
ed 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).
2 Maxim Integrated



Part Number MAX1044
Description Switched-Capacitor Voltage Converters
Maker Maxim - Maxim
Total Page 13 Pages
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