MEMORY存储芯片MAX690AEPA+中文规格书

The MAX660 capacitive charge-pump circuit eitherinverts or doubles the input voltage (see TypicalOperating Circuits). For highest performance, loweffective series resistance (ESR) capacitors should beused. See Capacitor Selectionsection for more details.When using the inverting mode with a supply voltageless than 3V, LV must be connected to GND. Thisbypasses the internal regulator circuitry and providesbest performance in low-voltage applications. Whenusing the inverter mode with a supply voltage above3V, LV may be connected to GND or left open. The partis typically operated with LV grounded, but since LVmay be left open, the substitution of the MAX660 for theICL7660 is simplified. LV must be grounded when over-driving OSC (see Changing Oscillator Frequencysec-tion). Connect LV to OUT (for any supply voltage) whenusing the doubling mode.

one-half of the charge-pump cycle. This introduces apeak-to-peak ripple of:

VRIPPLE = IOUT+IOUT(ESRC2)

2(fPUMP) (C2)

For a nominal fPUMPof 5kHz (one-half the nominal10kHz oscillator frequency) and C2 = 150µF with anESR of 0.2Ω, ripple is approximately 90mV with a100mA load current. If C2 is raised to 390µF, the rippledrops to 45mV.

Positive Voltage Doubler

The MAX660 operates in the voltage-doubling mode asshown in the Typical Operating Circuit.The no-loadoutput is 2 x VIN.

Other Switched-Capacitor Converters

Please refer to Table 1, which shows Maxim’s charge-pump offerings.

__________Applications Information

Negative Voltage Converter

The most common application of the MAX660 is as acharge-pump voltage inverter. The operating circuituses only two external capacitors, C1 and C2 (seeTypical Operating Circuits).

Even though its output is not actively regulated, theMAX660 is very insensitive to load current changes. Atypical output source resistance of 6.5Ωmeans thatwith an input of +5V the output voltage is -5V underlight load, and decreases only to -4.35V with a load of100mA. Output source resistance vs. temperature andsupply voltage are shown in the Typical OperatingCharacteristicsgraphs.

Output ripple voltage is calculated by noting the outputcurrent supplied is solely from capacitor C2 during

Changing Oscillator Frequency

Four modes control the MAX660’s clock frequency, aslisted below:FCOpenFC = V+Open orFC = V+Open

OSCOpenOpenExternal CapacitorExternal Clock

Oscillator Frequency10kHz80kHz

See Typical OperatingCharacteristics

External Clock Frequency

When FC and OSC are unconnected (open), the oscil-lator runs at 10kHz typically. When FC is connected toV+, the charge and discharge current at OSC changesfrom 1.0µA to 8.0µA, thus increasing the oscillator

Table 1. Single-Output Charge Pumps

MAX828PackageOp. Current(typ, mA)Output Ω(typ)Pump Rate(kHz)Input (V)SOT 23-50.0620121.25 to 5.5MAX829SOT 23-50.1520351.25 to 5.5MAX860SO-8,µMAXMAX861SO-8,µMAXMAX660SO-8MAX1044SO-8,µMAX0.036.551.5 to 10ICL7662SO-80.25125101.5 to 10ICL7660SO-8,µMAX0.0855101.5 to 100.2 at 6kHz,0.3 at 13kHz,0.12 at 5kHz,0.6 at 50kHz,1.1 at 100kHz,1 at 40kHz1.4 at 130kHz2.5 at 250kHz126, 50, 1301.5 to 5.51213, 100, 1501.5 to 5.56.55, 401.5 to 5.5CMOS Monolithic Voltage ConverterMAX660ABSOLUTE MAXIMUM RATINGS

Operating Temperature RangesSupply Voltage (V+ to GND, or GND to OUT).......................+6V

MAX660C_ _........................................................0°C to +70°CLV Input Voltage...............................(OUT - 0.3V) to (V+ + 0.3V)

MAX660E_ _.....................................................-40°C to +85°CFC and OSC Input Voltages........................The least negative of

MAX660MJA...................................................-55°C to +125°C(OUT - 0.3V) or (V+ - 6V) to (V+ + 0.3V)

Storage Temperature Range...............................-65°to +160°COUT and V+ Continuous Output Current..........................120mA

Lead Temperature (soldering, 10sec)...........................+300°COutput Short-Circuit Duration to GND (Note 1)....................1sec

Continuous Power Dissipation (TA= +70°C)

Plastic DIP (derate 9.09mW/°C above + 70°C)............727mWSO (derate 5.88mW/°C above +70°C)..........................471mWCERDIP (derate 8.00mW/°C above +70°C)..................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 +85°C, OUT must not be shorted to GND or V+, even instantaneously, or devicedamage may result.

Stresses beyond those listed under “Absolute Maximum Ratings\" may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(V+ = 5V, C1 = C2 = 150µF, test circuit of Figure 1, FC = open, TA = TMINto TMAX, unless otherwise noted.) (Note 2)

PARAMETEROperating Supply VoltageRL= 1kΩCONDITIONSInverter, LV = openInverter, LV = GNDDoubler, LV = OUTSupply CurrentOutput CurrentNo loadFC = open, LV = openFC = V+, LV = open100100156.55401080±1±8969298968899.0099.96%%10.012kHzµAΩMIN3.01.52.50.121TYPMAX5.55.55.50.53mAmAVUNITSTA≤+85°C, OUT more negative than -4VTA> +85°C, OUT more negative than -3.8VTA≤+85°C, C1 = C2 = 10µF, FC = V+ (Note 4)IL= 100mAFC = openFC = V+FC = openFC = V+RL= 1kΩconnected between V+ and OUTRL= 500Ωconnected between OUT and GNDIL= 100mA to GNDTA≤+85°C, C1 = C2 = 150µFTA≤+85°COutput Resistance (Note 3)Oscillator FrequencyOSC Input CurrentPower EfficiencyVoltage-ConversionEfficiencyNo loadNote 2:In the test circuit, capacitors C1 and C2 are 150µF, 0.2Ωmaximum ESR, aluminum electrolytics.

Capacitors with higher ESR may reduce output voltage and efficiency. See Capacitor Selectionsection.

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 ≤0.5Ω. Guaranteed by correlation, not production tested.