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MAX1878 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1878 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page Dual-Output Step-Down and LCD Step-Up Power Supply for PDAs 6 _______________________________________________________________________________________ Typical Operating Characteristics (continued) (VIN = VAIN = 2.5V, circuit of Figure 1, TA = +25°C, unless otherwise noted.) STEP-UP HEAVY-LOAD SWITCHING WAVEFORMS MAX1878 toc13 VLXLCD 10V/div 0 VOUT AC-COUPLED 100mV/div 1 μs/div ILCD = 4.5mA, VLCD = +18V, VIN = +2.5V, ON = PGND STEP-DOWN LOAD TRANSIENT RESPONSE MAX1878 toc14 VLX 2V/div IMAIN 200mA/div VMAIN AC-COUPLED 100mV/div 10 μs/div IMAIN = 10mA to 250mA, VMAIN = +1.8V, VIN = +2.5V, ONLCD = PGNDLCD STEP-UP LOAD TRANSIENT RESPONSE MAX1878 toc15 VLXLCD 10V/div ILCD 2mA/div VLCD AC-COUPLED 200mV/div 20 μs/div ILCD = 1mA to 4mA, VLCD = +18V, VIN = +2.5V, ON = PGND LINE TRANSIENT RESPONSE MAX1878 toc16 VIN 3V TO 2V VLCD AC-COUPLED 200mV/div VMAIN AC-COUPLED 20mV/div 100 μs/div VMAIN = +1.8V, IMAIN = 150mA, VLCD =18.0V, ILCD = 2.5mA SOFT-START AND SHUTDOWN RESPONSE MAX1878 toc17 IIN 200mA/div VLCD 10V/div VMAIN 1V/div VON = VONLCD 5V/div 400 μs/div RMAIN = 5.1 Ω, RLCD = 9.09kΩ STEP-DOWN LIGHT-LOAD SWITCHING WAVEFORMS MAX1878 toc10 VLX 1V/div 0 VMAIN AC-COUPLED 50mV/div 4 μs/div IMAIN = 20mA, VMAIN = +1.8V, VIN = +2.5V, ONLCD = PGNDLCD STEP-DOWN HEAVY-LOAD SWITCHING WAVEFORMS MAX1878 toc11 VLX 1V/div 0 VMAIN AC-COUPLED 20mV/div 1 μs/div IMAIN = 250mA, VMAIN = +1.8V, VIN = +2.5V, ONLCD = PGNDLCD STEP-UP LIGHT-LOAD SWITCHING WAVEFORMS MAX1878 toc12 VLXLCD 10V/div 0 VOUT AC-COUPLED 100mV/div 1 μs/div ILCD = 2mA, VLCD = +18V, VIN = +2.5V, ON = PGND |
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