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MAX8595XETA Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX8595XETA Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs _______________________________________________________________________________________ 5 Typical Operating Characteristics (continued) (Circuit of Figure 1, VIN = 3.6V, ILED = 25mA, L = 22µH, CIN = 2.2µF, COUT = 0.1µF, CCOMP = 0.1µF, RSENSE = 13 Ω, 4 LEDs, TA = +25°C, unless otherwise noted.) Pin Description PIN NAME FUNCTION 1 OUT Overvoltage Sense. When VOUT is greater than 38V (typ), the internal n-channel MOSFET turns off until VOUT drops below 36V (typ), then the IC reenters soft-start. Connect a 0.1µF ceramic capacitor from OUT to ground. In shutdown, VOUT is one diode drop below VIN. 2IN Input Voltage Supply. The input voltage range is 2.6V to 5.5V. Connect a 2.2µF ceramic capacitor from IN to GND. 3 CTRL Brightness Control Input. The voltage applied to CTRL controls LED brightness. Varying the voltage from 0.24V to 1.65V (1.72V for the MAX8596X) adjusts the brightness from dim to 100% brightness, respectively. Any voltage above 1.65V (1.72V) does not increase brightness. Hold CTRL below 100mV to shut down the IC after an 8.2ms delay. 4CS Current-Sense Feedback Input. Connect a resistor from CS to GND to set the LED bias current. The voltage at CS regulates to VCTRL / 5 or 0.330V (0.343V for the MAX8596X), whichever is lower. 5 COMP Compensation Input. Connect a 0.1µF ceramic capacitor (CCOMP) from COMP to GND. CCOMP stabilizes the converter, controls soft-start, and lowpass filters direct PWM dimming at CTRL. CCOMP discharges to 0V through an internal 20k Ω resistor in shutdown. 6 GND Ground. Connect to PGND and the exposed pad directly under the IC. 7 PGND Power Ground. Connect to GND and the exposed pad directly under the IC. 8LX Inductor Connection. Connect LX to the node between the inductor and the Schottky diode. LX is high impedance in shutdown. —EP Exposed Pad. Connect to a large ground plane for maximum package heat dissipation. Connect directly to GND and PGND under the IC. DIRECT-PWM DIMMING RESPONSE MAX8595X toc08 10 µs/div VCTRL 2V/div 32kHz 50% DUTY CYCLE 0 0 0 0 500mV/div AC-COUPLED 10mA/div 20mV/div AC-COUPLED VIN VOUT ILED CTRL STEP RESPONSE MAX8595X toc07 20ms/div VCTRL 1V/div 0 0 0 0 40mA/div 10V/div 100mA/div IIN ILED VOUT |
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