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PDF MAX1044 Data sheet ( Hoja de datos )

Número de pieza MAX1044
Descripción Switched-Capacitor Voltage Converters
Fabricantes Maxim Integrated 
Logotipo Maxim Integrated Logotipo



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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

1 page




MAX1044 pdf
MAX1044/ICL7660
Switched-Capacitor Voltage Converters
_____________________________________________________________ Pin Description
PIN NAME
FUNCTION
BOOST Frequency Boost. Connecting BOOST to V+ increases the oscillator frequency by a factor of six. When the
(MAX1044) oscillator is driven externally, BOOST has no effect and should be left open.
1
N.C.
(ICL7660)
No Connection
2
CAP+
Connection to positive terminal of Charge-Pump Capacitor
3
GND
Ground. For most applications, the positive terminal of the reservoir capacitor is connected to this pin.
4
CAP-
Connection to negative terminal of Charge-Pump Capacitor
5
VOUT
Negative Voltage Output. For most applications, the negative terminal of the reservoir capacitor is
connected to this pin.
6
LV
Low-Voltage Operation. Connect to ground for supply voltages below 3.5V.
ICL7660: Leave open for supply voltages above 5V.
7
OSC
Oscillator Control Input. Connecting an external capacitor reduces the oscillator frequency. Minimize stray
capacitance at this pin.
8 V+ Power-Supply Positive Voltage Input. (1.5V to 10V). V+ is also the substrate connection.
BOOST
V+
MAX1044
CAP+ ICL7660 OSC
C1
10μF
GND
LV
CBYPASS
= 0.1µF
EXTERNAL
OSCILLATOR
V+
COSC
RL
CAP-
VOUT
C2
10μF
VOUT
Figure 1. Maxim MAX1044/ICL7660 Test Circuit
_______________Detailed Description
The MAX1044/ICL7660 are charge-pump voltage con-
verters. They work by first accumulating charge in a
bucket capacitor and then transfer it into a reservoir
capacitor. The ideal voltage inverter circuit in Figure 2
illustrates this operation.
During the first half of each cycle, switches S1 & S3
close and switches S2 & S4 open, which connects the
bucket capacitor C1 across V+ and charges C1.
During the second half of each cycle, switches S2 & S4
close and switches S1 & S3 open, which connects the
positive terminal of C1 to ground and shifts the nega-
tive terminal to VOUT. This connects C1 in parallel with
the reservoir capacitor C2. If the voltage across C2 is
smaller than the voltage across C1, then charge flows
from C1 to C2 until the voltages across them are equal.
During successive cycles, C1 will continue pouring
charge into C2 until the voltage across C2 reaches
- (V+). In an actual voltage inverter, the output is less
than - (V+) since the switches S1–S4 have resistance
and the load drains charge from C2.
Additional qualities of the MAX1044/ICL7660 can be
understood by using a switched-capacitor circuit
model. Switching the bucket capacitor, C1, between
the input and output of the circuit synthesizes a resis-
tance (Figures 3a and 3b.)
When the switch in Figure 3a is in the left position,
capacitor C1 charges to V+. When the switch moves to
the right position, C1 is discharged to VOUT. The
charge transferred per cycle is: ΔQ = C1(V+ - VOUT). If
the switch is cycled at frequency f, then the resulting
Maxim Integrated
5

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MAX1044 arduino
MAX1044/ICL7660
Switched-Capacitor Voltage Converters
18
2 MAX1044
7
C1 ICL7660
36
45
1
V+
18
2 MAX1044
7
C1 ICL7660
36
45
n
VOUT = -(V+)
C2
Figure 13. Paralleling MAX1044/ICL7660 to Reduce Output
Resistance
1
2 MAX1044
ICL7660
10µF 3
4
a)
MAX1044
ICL7660
7
V+
10kΩ REQUIRED FOR TTL
8
1N4148
V+ CMOS or
TTL GATE
7
6
5
VOUT = -(V+)
10µF
V+ 74HC03
OPEN-DRAIN OR
74LS03
OPEN-COLLECTOR
NAND GATES
b)
MAX1044 7
ICL7660
V+ OUTPUT
ENABLE
74HC126 OR
74LS126
TRI-STATE BUFFER
c)
Figure 14a-14c. Shutdown Schemes for MAX1044/ICL7660
Paralleling Devices
Paralleling multiple MAX1044/ICL7660s reduces output
resistance and increases current capability. As illus-
trated in Figure 13, each device requires its own pump
capacitor C1, but the reservoir capacitor C2 serves all
devices. The equation for calculating output resistance is:
ROUT
=
ROUT(of MAX1044 or ICL7660)
n (number of devices)
Shutdown Schemes
Figures 14a–14c illustrate three ways of adding shut-
down capability to the MAX1044/ICL7660. When using
these circuits, be aware that the additional capacitive
loading on the OSC pin will reduce the oscillator fre-
quency. The first circuit has the least loading on the
OSC pin and has the added advantage of controlling
shutdown with a high or low logic level, depending on
the orientation of the switching diode.
_Ordering Information (continued)
PART
MAX1044ESA
MAX1044MJA
ICL7660CPA
ICL7660CSA
ICL7660CUA
ICL7660C/D
ICL7660EPA
ICL7660ESA
ICL7660AMJA
ICL7660AMTV
TEMP. RANGE
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
8 SO
8 CERDIP**
8 Plastic DIP
8 SO
8 µMAX
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
8 TO-99**
* Contact factory for dice specifications.
** Contact factory for availability.
The Maxim ICL7660 meets or exceeds all “A” and “S”
specifications.
Maxim Integrated
11

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