MAX660 Maxim Integrated Products, MAX660 Datasheet

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MAX660

Manufacturer Part Number
MAX660
Description
Manufacturer
Maxim Integrated Products
Datasheet

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The MAX660 monolithic, charge-pump voltage inverter
converts a +1.5V to +5.5V input to a corresponding
-1.5V to -5.5V output. Using only two low-cost
capacitors, the charge pump’s 100mA output replaces
switching regulators, eliminating inductors and their
associated cost, size, and EMI. Greater than 90%
efficiency over most of its load-current range combined
with a typical operating current of only 120µA provides
ideal performance for both battery-powered and board-
level voltage conversion applications. The MAX660 can
also double the output voltage of an input power supply
or battery, providing +9.35V at 100mA from a +5V
input.
A frequency control (FC) pin selects either 10kHz typ or
80kHz typ (40kHz min) operation to optimize capacitor
size and quiescent current. The oscillator frequency
can also be adjusted with an external capacitor or
driven with an external clock. The MAX660 is a pin-
compatible, high-current upgrade of the ICL7660.
The MAX660 is available in both 8-pin DIP and small-
outline packages in commercial, extended, and military
temperature ranges.
For 50mA applications, consider the MAX860/MAX861
pin-compatible devices (also available in ultra-small
µMAX packages).
________________________Applications
19-3293; Rev. 2; 9/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
__________________Pin Configuration
_______________General Description
TOP VIEW
Laptop Computers
Medical Instruments
Interface Power Supplies
Hand-Held Instruments
Operational-Amplifier Power Supplies
CAP+
CAP-
GND
FC
________________________________________________________________ Maxim Integrated Products
1
2
3
4
MAX660
DIP/SO
CMOS Monolithic Voltage Converter
8
7
6
5
V+
OSC
LV
OUT
♦ Small Capacitors
♦ 0.65V Typ Loss at 100mA Load
♦ Low 120µA Operating Current
♦ 6.5Ω Typ Output Impedance
♦ Guaranteed R
♦ Pin-Compatible High-Current ICL7660 Upgrade
♦ Inverts or Doubles Input Supply Voltage
♦ Selectable Oscillator Frequency: 10kHz/80kHz
♦ 88% Typ Conversion Efficiency at 100mA
*Contact factory for dice specifications.
_________Typical Operating Circuits
___________________________ Features
______________Ordering Information
MAX660CPA
MAX660CSA
MAX660C/D
MAX660EPA
MAX660ESA
MAX660MJA
1µF to 150µF
(I
L
2.5V TO 5.5V
PART
to GND)
1µF to 150µF
+V
C1
IN
C1
OUT
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
4
1
2
3
4
1
2
3
TEMP. RANGE
POSITIVE VOLTAGE DOUBLER
0°C to +70°C
0°C to +70°C
0°C to +70°C
FC
CAP+
CAP-
CAP+
GND
CAP-
GND
FC
< 15Ω for C1 = C2 = 10µF
VOLTAGE INVERTER
MAX660
MAX660
OSC
OSC
OUT
OUT
V+
LV
V+
LV
5
7
6
8
7
6
5
8
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
1.5V TO 5.5V
+V
IN
C2
1µF to 150µF
C2
1µF to 150µF
INVERTED
NEGATIVE
VOLTAGE
OUTPUT
DOUBLED
POSITIVE
VOLTAGE
OUTPUT
1

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MAX660 Summary of contents

Page 1

... The oscillator frequency can also be adjusted with an external capacitor or driven with an external clock. The MAX660 is a pin- compatible, high-current upgrade of the ICL7660. The MAX660 is available in both 8-pin DIP and small- outline packages in commercial, extended, and military temperature ranges ...

Page 2

... Note 4: The ESR ≤ 0.5Ω. Guaranteed by correlation, not production tested. 2 _______________________________________________________________________________________ Operating Temperature Ranges MAX660C_ _ ........................................................0°C to +70°C MAX660E_ _ .....................................................-40°C to +85°C MAX660MJA ...................................................-55°C to +125°C Storage Temperature Range............................... -65°to +160°C Lead Temperature (soldering, 10sec) ........................... +300°C ...

Page 3

... SUPPLY VOLTAGE (V) EFFICIENCY vs. LOAD CURRENT 100 LOAD CURRENT (mA) _________________________________________________________________________________________________ = +25° Figure 1. MAX660 Test Circuit SUPPLY CURRENT vs. OSCILLATOR FREQUENCY 10 1 0.1 0.01 5.5 0 OSCILLATOR FREQUENCY (kHz) OUTPUT VOLTAGE DROP vs. LOAD CURRENT 1 2.5V 0.8 0 3.5V 0 4.5V 0 5.5V ...

Page 4

CMOS Monolithic Voltage Converter _____________________________Typical Operating Characteristics (continued) EFFICIENCY vs. OSCILLATOR FREQUENCY 100 1mA LOAD 10mA LOAD 80mA LOAD 0 100 OSCILLATOR ...

Page 5

CMOS Monolithic Voltage Converter OUTPUT CURRENT vs. CAPACITANCE +4.5V -4V IN OUT 120 100 OSC = OPEN 0.33 1.0 2.0 2.2 4 100 220 CAPACITANCE ...

Page 6

... LV may be connected to GND or left open. The part is typically operated with LV grounded, but since LV may be left open, the substitution of the MAX660 for the ICL7660 is simplified. LV must be grounded when over- driving OSC (see Changing Oscillator Frequency sec- tion) ...

Page 7

... These curves assume 0.25Ω capacitor ESR and a 5.25Ω MAX660 output resistance, which is why the flat portion of the curve shows a 6.5Ω (ESR ) + ESR ) effective output resistance ...

Page 8

... Figure 4 shows the equation for calculating Aluminum elec- output resistance. trolytic thru-hole Low-ESR tantalum SMT Ceramic SMT Ceramic SMT "n" OUT C2n = -nV IN Figure 4. Paralleling MAX660s to Reduce Output Resistance Cascading Devices values. The output voltage, where OUT IN Paralleling Devices R (of MAX660) OUT R = OUT n (NUMBER OF DEVICES ...

Page 9

... Figure 5. Combined Positive Multiplier and Negative Converter _______________________________________________________________________________________ 3V LITHIUM BATTERY DURACELL DL123A 150µF NOTE: ALL 150µF CAPACITORS ARE MAXC001, AVAILABLE FROM MAXIM. D1 1N4148 Figure 6. MAX660 generates a +5V regulated output from lithium battery and operates for 16 hours with a 40mA load. OUT ( ...

Page 10

CMOS Monolithic Voltage Converter ___________________Chip Topography V+ FC CAP+ GND CAP- OUT 0.073" (1.85mm) TRANSISTOR COUNT = 89 SUBSTRATE CONNECTED TO V+. 10 ______________________________________________________________________________________ 0.120" (3.05mm) OSC LV ...

Page 11

CMOS Monolithic Voltage Converter ________________________________________________________Package Information ______________________________________________________________________________________ 0° - 15° Plastic DIP PLASTIC DUAL-IN-LINE PACKAGE (0.300 in.) 0.101mm 0.004in. C ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products ...

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