MAX660ESA+ Electronic IC Chips CMOS Monolithic Voltage Converter

CMOS Monolithic Voltage Converter

General Description

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 boardlevel 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 pincompatible, high-current upgrade of the ICL7660.

The MAX660 is available in both 8-pin DIP and smalloutline 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

Laptop Computers

Medical Instruments

Interface Power Supplies

Hand-Held Instruments

Operational-Amplifier Power Supplies

Features

• Small Capacitors

• 0.65V Typ Loss at 100mA Load

• Low 120µA Operating Current

• 6.5Ω Typ Output Impedance

• Guaranteed R_OUT < 15W for C1 = C2 = 10mF

• Pin-Compatible High-Current ICL7660 Upgrade

• Inverts or Doubles Input Supply Voltage

• Selectable Oscillator Frequency: 10kHz/80kHz

• 88% Typ Conversion Efficiency at 100mA (I_L to GND)

Pin Configuration

Typical Operating Circuits

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (V+ to GND, or GND to OUT) .......................+6V

LV Input Voltage ...............................(OUT - 0.3V) to (V+ + 0.3V)

FC and OSC Input Voltages........................The least negative of

                                       (OUT - 0.3V) or (V+ - 6V) to (V+ + 0.3V)

OUT and V+ Continuous Output Current..........................120mA

Output Short-Circuit Duration to GND (Note 1) ....................1sec

Continuous Power Dissipation (T_A = +70°C)

    Plastic DIP (derate 9.09mW/°C above + 70°C) ............727mW

    SO (derate 5.88mW/°C above +70°C)..........................471mW

    CERDIP (derate 8.00mW/°C above +70°C)..................640mW

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

Note 1: OUT may be shorted to GND for 1sec without damage, but shorting OUT to V+ may damage the device and should be avoided. Also, for temperatures above +85°C, OUT must not be shorted to GND or V+, even instantaneously, or device damage may result.

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.

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