MAX1680ESA+TG52

19-1247; Rev 0; 7/97 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters ________________________Applications Local Negative Supplies ____________________________Features ♦ Selectable Switching Frequencies: 125kHz/250kHz (MAX1680) 500kHz/1MHz (MAX1681) ♦ Allow Use of Small Capacitors (1µF for the MAX1681) ♦ 125mA Output Current ♦ 3.5Ω Output Impedance ♦ 1µA Logic-Controlled Shutdown ♦ Configurable as Voltage Inverters or Doublers ♦ +2.0V to +5.5V Input Voltage Range ♦ Available in 8-Pin SO Packages ♦ 90% Efficiency ______________Ordering Information PART Interface Power Supplies Op-Amp Power Supplies MOSFET Bias TEMP. RANGE PIN-PACKAGE MAX1680C/D 0°C to +70°C Dice* MAX1680ESA MAX1681C/D MAX1681ESA -40°C to +85°C 0°C to +70°C -40°C to +85°C 8 SO Dice* 8 SO *Contact factory for dice specifications. Pin Configuration appears at end of data sheet. __________________________________________________Typical Operating Circuits FSEL +VINPUT +3V TO +5.5V IN FSEL IN C2 1µF 1µF CAP+ C1 1µF SHDN CAP+ C1 1µF MAX1681 LV GND CAP- C2 1µF INVERTER CONFIGURATION SHDN MAX1681 LV OUT NOTE: USE 4.7µF CAPACITORS FOR MAX1680 INPUT VOLTAGE RANGE: +2.0V TO +5.5V. DOUBLED OUTPUT VOLTAGE INVERTED OUTPUT VOLTAGE +VINPUT +4V TO +5.5V 1µF GND CAP- OUT DOUBLER CONFIGURATION NOTE: USE 4.7µF CAPACITORS FOR MAX1680 INPUT VOLTAGE RANGE: +2.5V TO +5.5V. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. MAX1680/MAX1681 _______________General Description The MAX1680/MAX1681 inductorless switched-capacitor voltage converters either invert an input voltage of +2.0V to +5.5V or double it while supplying up to 125mA output current. They have a selectable-frequency option that allows the use of small capacitors: 4.7µF (MAX1680), 1µF (MAX1681). With their high output current capability, these charge-pump devices are suitable replacements for inductor-based regulators, which require more expensive external components and additional board space. The devices’ equivalent output resistance (typically 3.5Ω) allows them to deliver as much as 125mA with only a 440mV drop. A shutdown feature reduces quiescent current to less than 1µA. The MAX1680/MAX1681 are available in 8-pin SO packages. For devices that deliver up to 50mA in smaller µMAX packages, refer to the MAX860/MAX861 data sheet. MAX1680/MAX1681 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (TA = +70°C) SO (derate 5.88mW/°C above +70°C) ..........................471mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C IN ..............................................................................-0.3V to +6V LV....................................................(VOUT - 0.3V) to (VIN + 0.3V) CAP+ ...........................................................-0.3V to (VIN + 0.3V) SHDN, FSEL ......................................(VLV - 0.3V) to (VIN + 0.3V) OUT, CAP- ..................................................................-6V to 0.3V Continuous Output Current ..............................................135mA Output Short-Circuit Duration to GND (Note 1) ...................1sec Note 1: Shorting OUT to IN may damage the device and should be avoided. 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 (Typical Operating Circuits (inverter configuration), FSEL = LV = GND, VIN = 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF (MAX1681), TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Input Voltage Range SYMBOL VIN CONDITIONS 5.5 MAX1681 3.0 5.5 Doubler configuration, RL = 1kΩ, LV = OUT MAX1680 2.5 5.5 MAX1681 4.0 5.5 FSEL = IN (125kHz) TA = +25°C FSEL = LV (250kHz) TA = +25°C FSEL = IN (500kHz) TA = +25°C 10 FSEL = LV (1MHz) TA = +25°C 20 I+ Output Voltage Under Load (Note 2) VLOAD ILOAD = 125mA Output Resistance (Note 2) ROUT FSEL = IN or LV Shutdown Current ROUT(SHUT) I+SHDN 2.5 5 SHDN = IN IFSEL -1 LV = GND (Note 3) V 3.5 10 Ω 1 5 Ω 1 µA 1 µA 1 µA 4 FSEL = IN fOSC FSEL = LV MAX1681 FSEL = IN mA 36 1 MAX1680 2 18 -4.56 OUT = GND, SHDN = IN Input Bias Current (FSEL) Switching Frequency 9 43.2 -3.75 FSEL = LV V 21.6 -1 VIH V 4.5 10.8 ISHDN Shutdown, FSEL Thresholds UNITS 5.4 Input Bias Current (SHDN) VIL MAX 2.0 MAX1681 Output Resistance to Ground in Shutdown TYP MAX1680 MAX1680 Supply Current MIN Inverter configuration, RL = 1kΩ, LV = GND TA = +25°C 187 250 313 125 156 1000 1250 157 TA = +25°C 94 TA = +25°C 750 348 79 174 570 TA = +25°C 375 V 1490 500 285 _______________________________________________________________________________________ 625 745 kHz 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters (Typical Operating Circuits (inverter configuration), FSEL = LV = GND, VIN = 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF (MAX1681), TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Power Efficiency CONDITIONS RL = 100Ω to GND, FSEL = IN MIN TYP MAX1680 90 MAX1681 80 MAX UNITS % ELECTRICAL CHARACTERISTICS (Typical Operating Circuits (inverter configuration), FSEL = LV = GND, VIN = 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF (MAX1681), TA = -40°C to +85°C, unless otherwise noted.) (Note 4) PARAMETER Input Voltage Range SYMBOL VIN CONDITIONS MIN TYP MAX Inverter configuration, RL = 1kΩ, LV = GND MAX1680 2.0 5.5 MAX1681 3.0 5.5 Doubler configuration, RL = 1kΩ, LV = OUT MAX1680 2.5 5.5 MAX1681 4.0 5.5 FSEL = IN (125kHz) 5.4 FSEL = LV (250kHz) 10.8 MAX1680 Supply Current UNITS V mA I+ mA FSEL = IN (500kHz) 21.6 FSEL = LV (1MHz) 43.2 MAX1681 Output Voltage Under Load (Note 2) VLOAD ILOAD = 125mA Output Resistance (Note 2) ROUT FSEL = IN or LV 10 Ω SHDN = IN 5 Ω OUT = GND, SHDN = IN 1 µA 1 µA µA Output Resistance in Shutdown Shutdown Current ROUT(SHUT) I+SHDN -3.75 V Input Bias Current (SHDN) ISHDN Input Bias Current (FSEL) IFSEL -1 1 VIL -1 1 Shutdown, FSEL Thresholds VIH LV = GND (Note 3) MAX1680 Switching Frequency fOSC MAX1681 4 FSEL = LV 157 FSEL = IN 79 174 FSEL = LV 570 1490 FSEL = IN 285 745 V 348 kHz Note 2: C1 and C2 are low-ESR (