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DFE252012F-R47M Datasheet(PDF) 32 Page - Analog Devices |
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DFE252012F-R47M Datasheet(HTML) 32 Page - Analog Devices |
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32 / 122 page  VL34 VL12 VL34 REGULATOR VL12 REGULATOR 2.2µF 2.2µF MOSFET DRIVERS MOSFET DRIVERS SYS 2.2µF 2.2µF ALT_IN 1.8V 1.8V VSWO ALT_SWO SYS ALT_IN 0 1 ALT_SWO ALT_SWO SWITCH SWITCH SWITCHOVER VDD VDD REGULATOR 1µF INTERNAL LOGIC 1.9V DEFAULT INPUT (HIGH VOLTAGE) 2.8V TO 16V ALTERNATIVE INPUT (LOW VOLTAGE) VSWO TO 5.5V Figure 1. Alternative Input Switchover Circuit There are three ways of using the ALT_IN input: ● Option 1: Connect the ALT_IN pin to the AGND (not used). In this case, the internal linear regulator permanently receives power from the SYS pin. ● Option 2: Connect the ALT_IN pin to one of the buck outputs which is greater than the VSWO. Using a buck output for powering up the linear regulator improves the total efficiency of the device. (The buck output can be turned on and off dynamically.) ● Option 3: Connect the ALT_IN pin to an external high-efficiency DC source greater than the VSWO when neither buck output is greater than the VSWO. (Using a high-efficiency power source also improves the total system efficiency.) Device Configuration (CFGx) The MAX77542 supports user-selectable device configurations with a 1% tolerance (or better) resistor. The MAX77542 evaluates the resistances between the CFGx and the AGND whenever the VDD regulator first turns on (exits shutdown mode). The decoded values of the RCFGx are latched until the next time the device exits shutdown mode. The CFGx_LATCH[4:0] status bits reflect the latched decoded value of the RCFGx. See the Register Map section for more details. Table 2 decodes the default selection options for the I2C slave address and the default MFIO functions. Once latched, the MFIOx_FUNC[3:0] bits reflect the selected the MFIO options. The decoded values for RCFG1 ≥ 75kΩ are programmable at the factory. Note that all MFIOs are pulled down to AGND with an internal 800kΩ resistor until the RCFGx decoding is complete. Table 2. Device Configuration by RCFG1 RCFG1 (Ω) I2C SLAVE ADDRESS (7-BIT ADDRESS) MFIO1 MFIO2 MFIO3 MFIO4 MFIO5 MFIO6 MFIO7 MFIO8 ≤ 95.3 7'h60 (110 0000) EN_M1 POK_M1 EN_M2 POK_M2 EN_M3 POK_M3 EN_M4 POK_M4 200 7'h61 (110 0001) EN_M1 POK_M1 EN_M2 POK_M2 EN_M3 POK_M3 EN_M4 POK_M4 MAX77542 16VIN/16A, Quad-Phase High-Efficiency Buck Converter www.analog.com Analog Devices | 32 |
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