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LTC1623IS8 Datasheet(PDF) 9 Page - Linear Technology |
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LTC1623IS8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1623 APPLICATIONS INFORMATION To avoid turning on the external power MOSFETs too quickly, an internal 10k resistor has been placed in series with each of the output gate drive pins (see Functional Block Diagram). Therefore, it only needs an external 0.1 µF capacitor to create enough RC delay (10k • 0.1 µF = 1ms) to slow down the ramp rate of the output gate drive. In other words, it will take a minimum of 1ms to charge up the external MOSFET. An additional external 1k resistor between the 0.1 µF capacitor and the gate of the MOSFET (Figure 3) is required to eliminate possible MOSFET self oscillations. GA GB LTC1623 GND VCC 3.5V TO 5.5V VCC 0.1 µF 1k 13 8 680 Ω 56 3.3k VOUT 3.3V 10k 10 µF CLK DATA (PROGRAMMABLE) (FROM SMBus) AD0 AD1 510pF LOAD Si3442DV Si3442DV LT1431 1623 F04 470 µF 6V + Figure 4. 3.3V/3A Extremely Low Voltage Drop Regulator and Load Switch Figure 3. Dual Load Switch with Q2 On upon Power-Up VCC 2.7V TO 5.5V 10 µF (PROGRAMMABLE) FAN DISPLAY 1623 F03 (FROM SMBus) LTC1623 GND VCC AD0 AD1 CLK DATA GA GB 0.1 µF Q1 Si3442DV Q2 Si6433DQ 0.1 µF 1k 1k Figure 6. Switching Regulator with Low-Battery Detect Using 22 µA Standby Current VCC 2.7V TO 4.5V 0.1 µF 100 µF 1k 3 8 4 2 499k 5 7 LBO 22 µH* *SUMIDA CD54-220 604k 10 µF (PROGRAMMABLE) (FROM SMBus) 1N5817 LOAD SHDN Si3442DV Si3442DV LT1304-5 1623 F05 + 2200 µF 5V 200mA 100k + GA GB LTC1623 GND VCC CLK DATA AD0 AD1 GA GB LTC1623 GND VCC 3.5V TO 5.5V VCC 13 8 680 Ω 56 3.3k VOUT 3.3V SWITCHED VOUT 3.3V 10k 10 µF CLK DATA (PROGRAMMABLE) (FROM SMBus) AD0 AD1 510pF 0.1 µF Si3442DV LT1431 1623 TA03 1k 470 µF 6V Si3442DV + Figure 5. SMBus Controlled Low Dropout Regulator For active-low applications in which the load needs to be on upon power-up, an external P-channel switch can be used (Figure 3). This load can be switched off later after the proper protocol has been sent. Used with the LT ®1431, the LTC1623 makes a 3.3V/3A extremely low voltage drop regulator (Figures 4 and 5). In this application, the other output channel can be used to drive a separate load, or it can also be used to control the output of the LDO so that the user has total control over the switching in and switching out of the LDO (Figure 5). Also, with the help of the LT1304-5, the LTC1623 can be used to make a boost switching regulator with a low standby current of 22 µA (Figure 6). |
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