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MAX1967EUB Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1967EUB Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 15 page Low-Cost Voltage-Mode PWM Step-Down Controllers 6 _______________________________________________________________________________________ IOUT VIN = 5.0V VIN = 1.8V L = 22 µF Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) 1A/div 1V/div 2V/div INDUCTOR CURRENT VOUT VIN 10ms/div SHUTDOWN WAVEFORMS NO LOAD Pin Description PIN MAX1966 MAX1967 NAME FUNCTION 1 10 BST Positive Supply of DH Driver. Connect 0.1µF ceramic capacitor between BST and LX. 2 1 COMP/EN Compensation Pin. Pulling COMP/EN low with an open-collector or open-drain device turns off the output. 3 2 FB Feedback Input. Connect a resistive divider network to set VOUT. FB threshold is 0.8V. — 3 VCC Internal Chip Supply. Connect to VL via a 10 Ω resistor. 4 4 VIN Power Supply for LDO Regulator in the MAX1967 and Chip Supply for the MAX1966. Bypass with a ceramic capacitor to ground (see application circuit). — 5VL Output of Internal 5V LDO. Bypass with a 2.2µF capacitor to GND, or if VIN < 5.5, connect VL to VIN and bypass with a 0.1µF capacitor to GND. 5 6 DL Low-Side External MOSFET Gate-Driver Output. DL swings from VL to GND. 6 7 GND Ground and Negative Current-Sense Input 78 LX Inductor Switching Node. LX is used for both current limit and the return supply of the DH driver. 8 9 DH High-Side External MOSFET Gate-Driver Output. DH swings from BST to LX. |
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