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MAX1961 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1961 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 29 page MOSFET Gate Drivers The DH and DL drivers are designed to drive logic-level N-channel MOSFETs to optimize system cost and effi- ciency. MOSFETs with RDSON rated at VGS 4.5V are recommended. An adaptive dead-time circuit monitors the DL output and prevents the high-side MOSFET from turning on until DL is fully off. There must be a low-resis- tance, low-inductance path from the DL driver to the MOSFET gate for the adaptive dead-time circuit to work properly. Otherwise, the internal sense circuitry could interpret the MOSFET gate as “off” while there is actually still charge left on the gate. Use very short, wide traces measuring no more than 20 squares (50mils to 100mils wide if the MOSFET is 1in from the IC). Undervoltage Lockout and Soft-Start There are two undervoltage lockout (UVLO) circuits on the MAX1960/MAX1961/MAX1962. The first UVLO cir- cuit monitors VCC, which must be above 2.15V (typ) in order for the charge pump to operate. The second UVLO circuit monitors the output of the charge pump. The charge-pump output, VDD, must be above 4.2V (typ) in order for the PWM converter to operate. Both UVLO circuits inhibit switching and force DL high and DH low when either VCC or VDD are below their threshold. When the monitored voltages are above their thresh- olds, an internal soft-start timer ramps up the error- amplifier reference voltage. The ramp occurs in eighty 10mV steps. Full output voltage is reached 1.28ms after activation with a 1MHz operating frequency. 2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining ______________________________________________________________________________________ 11 S R Q Q CURRENT SENSE OSC UVLO SOFT-START DAC CHARGE PUMP OSC VDD REF ILIM (MAX1960/MAX1961) FSET/SYNC CLKOUT COMP FB (MAX1960/MAX1962) OUT (MAX1961/MAX1962) FEEDBACK SELECT VSEL (MAX1961/MAX1962) C+ C- VDD VCC REF AVDD PGND GND DL LX DH BST SHUTDOWN AND VOLTAGE MARGINING CTL1 (MAX1960/MAX1961) CTL2 (MAX1960/MAX1961) EN (MAX1962) PGND LX CS (MAX1962) OSC OUT MAX1960/ MAX1961/ MAX1962 COMP ERROR AMP Figure 1. Functional Diagram |
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