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MAX1579 Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX1579 Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 13 page Complete Bias and White LED Power Supplies for Small TFT Displays _______________________________________________________________________________________ 3 PARAMETER CONDITIONS MIN TYP MAX UNITS NEG Output Voltage ILOAD = 0 to -100µA -10.2 -9.8 -9.3 V NEG Discharge Switch Resistance VONBIAS = 0V 1.5 3 k Ω LOGIC INPUT (ONBIAS) Logic Input Low Voltage 0.72 V Logic Input High Voltage 1.6 V TA = +25°C 0.01 1 Input Current TA = +85°C 1 µA LED BACKLIGHTING Efficiency LOAD = 6 LEDs in series at 20mA 84 % OUT Voltage Range (Note 2) (VIN - VD1) 32 V Overvoltage-Lockout (OVLO) Threshold VOUT rising, 2V hysteresis 32 34 36 V VOUT = 32V, VCTRL > 0.24V 10 20 32 TA = +25°C 0.01 1 OUT Input Bias Current VOUT = VIN, VCTRL = 0 TA = +85°C 0.1 µA ERROR AMPLIFIER TA = +25°C 0.295 0.300 0.305 CTRL to CS Regulation VCTRL = 1.5V, VIN = 2.7V to 5.5V TA = -40°C to +85°C 0.292 0.300 0.308 V TA = +25°C 0.01 1 CS Input Bias Current VCS = VCTRL / 5 TA = +85°C 0.03 µA MAX1578 250 500 780 TA = +25°C 250 500 780 CTRL Input Resistance VCTRL < 1.0V MAX1579 TA = +85°C 185 k Ω CTRL Dual Mode ™ Threshold 5mV hysteresis 100 170 240 mV CTRL Shutdown Delay (Note 3) 6.5 8.2 10.5 ms CS to COMP Transconductance VCOMP = 1.0V 32 60 90 µS CS Regulation Derating Function Start Temperature VCTRL = 3V, MAX1579 only +42 °C CS Regulation Derating Function Slope VCTRL = 3V, TA = +65°C, MAX1579 only -6 mV/°C MAX1578, VCTRL = 3V 310 327 345 CS Maximum Brightness Clamp Voltage MAX1579, VCTRL = 3V, TA = +25°C 322 340 358 mV MAX1578 1.635 CS Maximum Brightness Voltage at CTRL MAX1579 1.70 V OSCILLATOR Operating Frequency fBOOST 0.8 1.0 1.2 MHz PWM mode 12 Minimum Duty Cycle Pulse skipping 0 % Maximum Duty Cycle CTRL = IN, CS = GND 92 95 % ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 3, VIN = 3V, CTRL = ONBIAS = IN, TA= -40 °C to +85°C, typical values are at TA= +25°C, unless otherwise noted. Note 1) Dual Mode is a trademark of Maxim Integrated Products, Inc. |
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