MAX639C MAXIM [Maxim Integrated Products], MAX639C Datasheet
MAX639C
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MAX639C Summary of contents
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... Preset or Adjustable Output Voltage: 5.0V (MAX639) 3.3V (MAX640) 3.0V (MAX653) ♦ Low-Battery Detection Comparator ♦ Current-Limiting PFM Control Scheme ______________Ordering Information PART MAX639CPA MAX639CSA MAX639C/D MAX639EPA MAX639ESA MAX639MJA Ordering Information continued on last page. *Contact factory for dice specifications. __________________Pin Configuration TOP VIEW OUTPUT 5V ...
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... MAX640 MAX653 MAX639 Switch Off-Time MAX640 MAX653 2 _______________________________________________________________________________________ Operating Temperature Ranges: MAX639C_ _ .......................................................0°C to +70°C MAX639E_ _ ....................................................-40°C to +85°C MAX639MJA ..................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+300°C = 0mA LOAD A CONDITIONS < ...
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High-Efficiency, Low I ELECTRICAL CHARACTERISTICS (continued) ( for the MAX639 for the MAX640/MAX653, I unless otherwise noted.) PARAMETER Switch On-Resistance ...
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High-Efficiency, Low I , Step-Down DC-DC Converters Q _____________________________Typical Operating Characteristics (continued) (Circuit of Figure 3, internal feedback 100µH, T EFFICIENCY vs. OUTPUT CURRENT 100 L = 100µ MAX639 MAX640 ...
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High-Efficiency, Low I _____________________________Typical Operating Characteristics (continued) (Circuit of Figure 3, internal feedback 100µH, T MAX639 START-UP TIME vs. OUTPUT CURRENT 12 MEASURED FROM THE RISING EDGE SHDN 5V). OUT 10 ...
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High-Efficiency, Low I , Step-Down DC-DC Converters Q _____________________________Typical Operating Characteristics (continued) (Circuit of Figure 3, internal feedback 100µH, T MAX653 LOAD-TRANSIENT RESPONSE 1ms/div A: I 0mA TO 100mA, 50mA/div LOAD 100mV/div, AC COUPLED ...
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High-Efficiency, Low I ______________________________________________________________Pin Description PIN NAME Sense Input for regulated-output operation. Internally connected to an on-chip voltage divider and to 1 VOUT the variable duty-cycle, on-demand oscillator. It must be connected to the external regulated output. Low-Battery Output. ...
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High-Efficiency, Low I , Step-Down DC-DC Converters Q Figure 2 shows what happens to the ideal circuit of Figure 1 if the switch turns on with a 66% duty cycle and The inductor current ...
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High-Efficiency, Low I Low-Battery Detector The low-battery detector compares the voltage on the LBI input with the internal 1.28V reference. LBO goes low whenever the input voltage at LBI is less than 1.28V. Set the low-battery detection voltage with ...
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High-Efficiency, Low I , Step-Down DC-DC Converters Q INPUT +4.0V TO +11. 100µ 1N5817 SHDN C IN MAX639 1 100µF VOUT MAX640 MAX653 VFB 7 GND LBI 4 3 Figure 4. Adjustable-Output ...
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High-Efficiency, Low SHDN 100µ MAX639 MAX640 1 MAX653 VOUT GND VFB 4 7 Figure 6. Inverting Configuration capacitor, even when the switch is off. This will usually not be ...
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High-Efficiency, Low I , Step-Down DC-DC Converters Q _Ordering Information (continued) PART TEMP RANGE MAX640CPA 0°C to +70°C MAX640CSA 0°C to +70°C MAX640C/D 0°C to +70°C MAX640EPA -40°C to +85°C MAX640ESA -40°C to +85°C MAX640MJA -55°C to +125°C MAX653CPA ...
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High-Efficiency, Low I , Step-Down DC-DC Converters Q (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages TOP VIEW ...