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MAX1875EEG Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1875EEG Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 21 page The internal VL linear regulator can source over 50mA to supply the IC, power the low-side gate driver, charge the external boost capacitor, and supply small external loads. When driving large FETs, little or no regulator cur- rent may be available for external loads. For example, when switched at 600kHz, a single large FET with 18nC total gate charge requires 18nC ✕ 600kHz = 11mA. To drive larger MOSFETs, or deliver larger loads, connect VL to an external power supply from 4.75V to 5.5V. Dual 180° Out-of-Phase PWM Step- Down Controllers with POR _______________________________________________________________________________________ 9 CONVERTER #1 R S Q ILIM1 DL1 PGND LX1 DH1 BST1 VL - 0.5V FB1 COMP1 SOFT-START DAC OSCILLATOR OSC SYNC CK0 V+ 5V LINEAR REGULATOR VL GND REF DL2 LX2 DH2 BST2 ILIM2 FB2 COMP2 CONVERTER 2 RESET EN UVLO AND SHUTDOWN VREF 2.0V MAX1875 MAX1876 RST (MAX1876 ONLY) VREF VL Q 5 µA Figure 2. Functional Diagram |
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