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MAX16936RATEA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX16936RATEA Datasheet(HTML) 10 Page - Maxim Integrated Products |
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10 / 17 page  MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current 10 Maxim Integrated Synchronization Input (FSYNC) FSYNC is a logic-level input useful for operating mode selection and frequency control. Connecting FSYNC to BIAS or to an external clock enables fixed-frequency FPWM operation. Connecting FSYNC to AGND enables skip mode operation. The external clock frequency at FSYNC can be higher or lower than the internal clock by 20%. Ensure the duty cycle of the external clock used has a minimum pulse width of 100ns. The device synchronizes to the external clock within one cycle. When the external clock signal at FSYNC is absent for more than two clock cycles, the device reverts back to the internal clock. System Enable (EN) An enable control input (EN) activates the device from its low-power shutdown mode. EN is compatible with inputs from automotive battery level down to 3.5V. The high voltage compatibility allows EN to be connected to SUP, KEY/KL30, or the inhibit pin (INH) of a CAN transceiver. EN turns on the internal regulator. Once VBIAS is above the internal lockout threshold, VUVL = 3.15V (typ), the controller activates and the output voltage ramps up within 8ms. A logic-low at EN shuts down the device. During shut- down, the internal linear regulator and gate drivers turn off. Shutdown is the lowest power state and reduces the quiescent current to 5FA (typ). Drive EN high to bring the device out of shutdown. Figure 1. Internal Block Diagram FBSW OUT COMP PGOOD EN FB SOFT START SLOPE COMP FBOK EAMP HSD LSD AON LOGIC CS REF HVLDO SWITCH OVER PWM SUP BIAS BST SUPSW LX PGND SYNCOUT BIAS FSYNC FOSC AGND OSC MAX16936 |
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