PDF《19-6903; Rev 1; 6/14》

93 95

97 % FB Threshold for RESET Falling VFB-OKF VFB falling

90 92

94 % RESET Delay after FB Reaches 95% Regulation 2.1 ms RESET Output Level Low IRESET = 1mA 0.23 V RESET Output Leakage Current VFB = 1.01 x VFB-REG, TA = +25°C

1 ?A MODE MODE PFM Threshold VMODE-PFM

1 1.22 1.44 V MODE Hysteresis VMODE-HYS 0.19 V MODE Internal Pullup Resistor VMODE = unconnected

235 kΩ VMODE = GND

1390 THERMAL SHUTDOWN Thermal-Shutdown Threshold Temperature rising

160 °C Thermal-Shutdown Hysteresis

20 °C ??

4 www.maximintegrated.com/cn Electrical Characteristics (continued) (VIN = 24V, VGND = 0V, VOUT = 3.3V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, CIN = 1μF, TA = +25°C unless otherwise noted)

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100 1

10 100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc1 VIN = 24V VIN = 36V VIN = 12V FIGURE

6 APPLICATION CIRCUIT, PFM MODE VOUT = 5V

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10 100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc2 VIN = 36V VIN = 12V VIN = 24V FIGURE

7 APPLICATION CIRCUIT, PFM MODE VOUT = 3.3V

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100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc3 VIN = 48V VIN = 36V VIN = 24V VIN = 12V VIN = 60V FIGURE

6 APPLICATION CIRCUIT, PWM MODE VOUT = 5V

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100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc4 VIN = 36V VIN = 60V VIN = 12V VIN = 24V FIGURE

7 APPLICATION CIRCUIT PWM MODE, VOUT = 3.3V VIN = 6V VIN = 48V 4.96 4.99 5.02 5.05 5.08

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80 100 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT toc5 FIGURE

6 APPLICATION CIRCUIT, PFM MODE VIN = 24V VIN = 48V,60V VIN = 12V VIN = 36V 3.30 3.32 3.34 3.36 3.38 3.40

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80 100 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT toc6 FIGURE

7 APPLICATION CIRCUIT, PFM MODE VIN = 48V VIN = 12V, 24V VIN = 36V VIN = 60V 4.984 4.986 4.988 4.99 4.992 4.994

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80 100 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT toc7 VIN = 48V VIN = 36V VIN = 24V VIN = 12V VIN = 60V FIGURE

6 APPLICATION CIRCUIT, PWM MODE 3.316 3.318 3.320 3.322 3.324 3.326 3.328 3.330

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80 100 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT toc8 VIN = 48V VIN = 36V VIN = 12V VIN = 60V FIGURE

7 APPLICATION CIRCUIT, PWM MODE VIN = 24V 0.78 0.79 0.80 0.81 0.82 -40 -20

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120 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) FEEDBACK VOLTAGE VS. TEMPERATURE toc9 ??

5 www.maximintegrated.com/cn 典型工作特性 (VIN = 24V, VGND = 0V, VOUT = 3.3V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, CIN = 1μF, TA = +25°C unless otherwise noted)

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45 55 NO LOAD SUPPLY CURRENT (?A) INPUT VOLTAGE (V) NO LOAD SUPPLY CURRENT vs. INPUT VOLTAGE toc10 PFM MODE -2.0 -0.5 1.0 2.5 4.0

5 15

25 35

45 55 SHUTDOWN CURRENT (?A) INPUT VOLTAGE (V) SHUTDOWN CURRENT vs. INPUT VOLTAGE toc11 0.5 0.8 1.1 1.4 1.7 2.0 -40 -20

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120 SHUTDOWN CURRENT (?A) TEMPERATURE (°C) SHUTDOWN CURRENT vs. TEMPERATURE toc12

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45 55 SWITCH CURRENT LIMIT (mA) INPUT VOLTAGE (V) SWITCH CURRENT LIMIT vs. INPUT VOLTAGE toc13 SWITCH PEAK CURRENT LIMIT SWITCH NEGATIVE CURRENT LIMIT

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200 250 -40 -20

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120 SWITCH CURRENT LIMIT (mA) TEMPERATURE (°C) SWITCH CURRENT LIMIT vs. TEMPERATURE toc14 SWITCH PEAK CURRENT LIMIT SWITCH NEGATIVE CURRENT LIMIT 1.10 1.14 1.18 1.22 1.26 1.30 -40 -20