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MAX1765EUE Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1765EUE Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 19 page 800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator _______________________________________________________________________________________ 9 PIN NAME FUNCTION 1 FBL Low-Dropout Linear Regulator Dual-Mode Feedback Input. Connect FBL to ground for 2.85V nominal output voltage. Connect FBL to a resistor-divider from OUTL to ground for an adjustable output voltage. FBL regulates to 1.25V. 2 ISET Set N-Channel Current Limit. For maximum current limit, connect ISET to REF. To reduce current limit, use a resistor-divider from REF to GND. If soft-start is desired, a capacitor can be added from ISET to GND. When ONA = LO and ONB = HI or VREF < 80% of nominal value, an on-chip 100k Ω switchable resistor discharges ISET to GND. 3 REF 1.25V Reference Output. Connect a 0.22µF bypass capacitor to GND; 50µA of external load current is allowed. The reference is enabled if ONA = HI, ONB = LO, or ONL = HI. 4 GND Ground. Connect to PGND with short trace. 5FB Boost Converter Feedback Input. Connect a resistor-divider between OUT and GND to set the output voltage in the range of 2.5V to 5V. In track mode, FB is disabled after OUTL is in regulation. 6 OUT Boost Converter IC power is derived from OUT. Connect OUT to POUT through a 4.7 Ω resistor and bypass to GND with a 0.68µF capacitor. 7 ONA ON Input. When high, the DC-DC is operational (Table 2). 8 CLK/SEL CLOCK Input for the DC-DC Converter. Also serves to program operating mode of switch as follows: CLK/SEL = LOW: Normal mode. Operates at a fixed frequency, automatically switching to low-power (SKIP) mode when the load is minimized. CLK/SEL = HI: Forced PWM mode. Operates in low-noise, constant-frequency mode at all loads. CLK/SEL = Clocked: Synchronized forced PWM mode. The internal oscillator is synchronized to an external clock in the 500kHz to 1200kHz frequency range. Pin Description 0 0.4 0.2 0.8 0.6 1.2 1.0 1.4 0 0.4 0.6 0.2 0.8 1.0 1.2 1.4 SWITCH CURRENT LIMIT vs. VISET VISET (V) VOUT = +3.3 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) LIGHT-LOAD SWITCHING WAVEFORMS (VIN = +2.4V, VOUT = +3.3V, IOUT = 10mA) MAX1765 toc17 A: LX NODE, 5V/div B: INDUCTOR CURRENT, 200mA/div, AC-COUPLED C: OUTPUT RIPPLE, 20mV/div, AC-COUPLED A B C 500ns/div 450 0.1 1 10 LINEAR-REGULATOR OUTPUT NOISE 50 0 FREQUENCY (MHz) 150 250 350 ILDO = 200mA VLDO = 2.85V |
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