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MAX5023 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX5023 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 13 page Select preset voltage mode by connecting SET to ground. In adjustable mode, select an output between +2.5V and +11V using two external resistors connected as a voltage-divider to SET (Figure 4). Set the output voltage using the following equation: VOUT = VSET (1 + R1 / R2) where VSET = 1.248V and R2 ≅ 100kΩ. Available Output Current Calculation The MAX5023/MAX5024 high-voltage regulator pro- vides up to 150mA of output current. The input voltage extends to +65V. Package power dissipation limits the amount of output current available for a given input/ output voltage and ambient temperature. Figure 5 depicts the maximum power dissipation curve for these devices. The graph assumes that the exposed metal pad of the MAX5023/MAX5024 package is soldered to 1in2 of PC board copper. Use Figure 5 to determine the allowable package dissi- pation for a given ambient temperature. Alternately, use the following formula to calculate the allowable pack- age dissipation: After determining the allowable package dissipation, calculate the maximum output current using the follow- ing formula: The above equations do not include the negligible power dissipation from self-heating due to the IC ground current. I P V mA OUT MAX D IN () ≅≤ -VOUT 150 P W for T C C for C C D A = ≤+ ° ° () +° < ≤ + ° 1 538 70 1 538 70 70 125 . . - 0.01923 T - T AA 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with µP Reset and Watchdog Timer 10 ______________________________________________________________________________________ IN EN GND HOLD VOUT = VSET (1 + R1 / R2) VSET = 1.248V R2 = 1k Ω TO 500kΩ SET OUT RESET TO µP 15 µF R1 +6.5V TO +65V +2.5V TO +11V ON OFF R2 MAX5024 10 µF Figure 4. Setting the MAX5024 Adjustable Output Voltage 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TA ( °C) DERATE 19.23mW/ °C 1.538W Figure 5. Maximum Power Dissipation vs. Temperature Table 1. Truth Table for Regulator Output State X = Don’t care. ORDER EN HOLD OUT COMMENTS 1 Low X Off Initial state. EN has 5M Ω internal resistor to ground. HOLD has internal current source to OUT. 2 High X On Regulator output is active when EN is pulled high. 3 High Low On Hold is asserted forcing the regulator output on even if EN goes low. 4X Low On Self-holding state. Regulator output stays on regardless of the state of EN. 5 Low High Off Regulator output is shutdown by releasing HOLD while EN remains low. |
Similar Part No. - MAX5023_05 |
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Similar Description - MAX5023_05 |
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