MAX660 19-3293 Rev. 2 9/96 CMOS Monolithic Voltage Converter General Description Features The MAX660 monolithic, charge-pump voltage inverter Small Capacitors converts a +1.5V to +5.5V input to a corresponding 0.65V Typ Loss at 100mA Load -1.5V to -5.5V output. Using only two low-cost Low 120A Operating Current capacitors, the charge pumps 100mA output replaces switching regulators, eliminating inductors and their 6.5 Typ Output Impedance associated cost, size, and EMI. Greater than 90% Guaranteed R < 15 for C1 = C2 = 10 F OUT efficiency over most of its load-current range combined Pin-Compatible High-Current ICL7660 Upgrade with a typical operating current of only 120A provides ideal performance for both battery-powered and board- Inverts or Doubles Input Supply Voltage level voltage conversion applications. The MAX660 can Selectable Oscillator Frequency: 10kHz/80kHz also double the output voltage of an input power supply 88% Typ Conversion Efficiency at 100mA or battery, providing +9.35V at 100mA from a +5V (I to GND) L input. A frequency control (FC) pin selects either 10kHz typ or Ordering Information 80kHz typ (40kHz min) operation to optimize capacitor size and quiescent current. The oscillator frequency PART TEMP. RANGE PIN-PACKAGE can also be adjusted with an external capacitor or MAX660CPA 0C to +70C 8 Plastic DIP driven with an external clock. The MAX660 is a pin- MAX660CSA 0C to +70C 8 SO compatible, high-current upgrade of the ICL7660. MAX660C/D 0C to +70C Dice* The MAX660 is available in both 8-pin DIP and small- MAX660EPA -40C to +85C 8 Plastic DIP outline packages in commercial, extended, and military MAX660ESA -40C to +85C 8 SO temperature ranges. MAX660MJA -55C to +125C 8 CERDIP For 50mA applications, consider the MAX860/MAX861 *Contact factory for dice specifications. pin-compatible devices (also available in ultra-small MAX packages). Typical Operating Circuits Applications +V IN Laptop Computers 1.5V TO 5.5V Medical Instruments 1 8 FC V+ Interface Power Supplies 2 7 CAP+ OSC MAX660 Hand-Held Instruments C1 6 Operational-Amplifier Power Supplies 3 LV INVERTED GND 1 F to 150 F NEGATIVE VOLTAGE 4 5 CAP- OUT OUTPUT Pin Configuration C2 1 F to 150 F VOLTAGE INVERTER TOP VIEW DOUBLED POSITIVE VOLTAGE 1 8 OUTPUT FC V+ 1 FC 8 2 7 V+ C1 C2 CAP+ OSC MAX660 1 F to 150 F 2 1 F to 150 F 7 CAP+ OSC 6 3 MAX660 LV +V GND 3 IN 6 LV GND 2.5V TO 5.5V 4 4 5 5 OUT CAP- CAP- OUT DIP/SO POSITIVE VOLTAGE DOUBLER Maxim Integrated Products 1 For free samples & the latest literature: CMOS Monolithic Voltage Converter ABSOLUTE MAXIMUM RATINGS Supply Voltage (V+ to GND, or GND to OUT) .......................+6V Operating Temperature Ranges LV Input Voltage ...............................(OUT - 0.3V) to (V+ + 0.3V) MAX660C ........................................................0C to +70C FC and OSC Input Voltages........................The least negative of MAX660E .....................................................-40C to +85C (OUT - 0.3V) or (V+ - 6V) to (V+ + 0.3V) MAX660MJA ...................................................-55C to +125C OUT and V+ Continuous Output Current..........................120mA Storage Temperature Range............................... -65to +160C Output Short-Circuit Duration to GND (Note 1) ....................1sec Lead Temperature (soldering, 10sec) ........................... +300C Continuous Power Dissipation (T = +70C) A Plastic DIP (derate 9.09mW/C above + 70C) ............727mW SO (derate 5.88mW/C above +70C)..........................471mW CERDIP (derate 8.00mW/C above +70C)..................640mW 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 +85C, OUT must not be shorted to GND or V+, even instantaneously, or device damage may result. Stresses beyond those listed under Absolute Maximum Rating 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 (V+ = 5V, C1 = C2 = 150F, test circuit of Figure 1, FC = open, T = T to T , unless otherwise noted.) (Note 2) A MIN MAX PARAMETER CONDITIONS MIN TYP MAX UNITS Inverter, LV = open 3.0 5.5 Operating Supply Voltage R = 1k Inverter, LV = GND 1.5 5.5 V L Doubler, LV = OUT 2.5 5.5 FC = open, LV = open 0.12 0.5 Supply Current No load mA FC = V+, LV = open 13 T +85C, OUT more negative than -4V 100 A Output Current mA T > +85C, OUT more negative than -3.8V 100 A T +85C, C1 = C2 = 10 F, FC = V+ (Note 4) 15 A Output Resistance (Note 3) I = 100mA T +85C, C1 = C2 = 150 F 6.5 10.0 L A T +85C 12 A FC = open 510 Oscillator Frequency kHz FC = V+ 40 80 FC = open 1 OSC Input Current A FC = V+ 8 R = 1k connected between V+ and OUT 96 98 L Power Efficiency R = 500 connected between OUT and GND 92 96 % L I = 100mA to GND 88 L Voltage-Conversion No load 99.00 99.96 % Efficiency Note 2: In the test circuit, capacitors C1 and C2 are 150F, 0.2 maximum ESR, aluminum electrolytics. Capacitors with higher ESR may reduce output voltage and efficiency. See Capacitor Selection section. Note 3: Specified output resistance is a combination of internal switch resistance and capacitor ESR. See Capacitor Selection section. Note 4: The ESR of C1 = C2 0.5. Guaranteed by correlation, not production tested. 2 MAX660