Rainbow-electronics MAX1765 Uživatelský manuál Strana 1

General DescriptionThe MAX1765 is a high-efficiency, low-noise, step-upDC-DC converter intended for use in battery-poweredwireless applications. This

MAX1765Detailed DescriptionThe MAX1765 is a highly efficient, low-noise powersupply for portable RF hand-held instruments. Thisboost power supply comb

less power. SKIP mode allows higher efficiency thanPWM under light-load conditions.Light-Load Operation in Normal ModeAt light loads, the MAX1765 oper

MAX1765PWM Operation in Normal ModeThe MAX1765 transitions to fixed-frequency PWM oper-ation under medium and heavy loads. The N-channelFET is engaged

tures a 250mΩ , P-channel MOSFET pass transistor.This provides several advantages, including longer bat-tery life, over similar designs using a PNP pa

MAX1765that VFBL = 0.5V (above the Dual Mode™ threshold)when OUTL is regulated, to ensure that the linear regu-lator is saturated. Another method to c

current limit increases and the output voltage rises. Thesoft-start time constant is:Placing a capacitor across the lower resistor of the cur-rent-lim

MAX1765used if ISET is employed to reduce the peak inductorcurrent (see Setting the Switch Current Limit and Soft-Start). For high efficiency, choose

where ILIMis the peak inductor current limit, fSWis theoperating frequency (typically 1.2MHz), L is the induc-tance of the chosen inductor, LRESRis th

MAX1765the regulator turns on. The switch must be pressedlong enough for the microcontroller (µC) to exit resetand drive ONA high. A small capacitor i

800mA, Low-Noise, Step-Up DC-DC Converterwith 500mA Linear RegulatorMaxim cannot assume responsibility for use of any circuitry other than circuitry e

MAX1765800mA, Low-Noise, Step-Up DC-DC Converterwith 500mA Linear Regulator2 _________________________________________________________________________

MAX1765800mA, Low-Noise, Step-Up DC-DC Converterwith 500mA Linear Regulator___________________________________________________________________________

MAX1765800mA, Low-Noise, Step-Up DC-DC Converterwith 500mA Linear Regulator4 _________________________________________________________________________

MAX1765800mA, Low-Noise, Step-Up DC-DC Converterwith 500mA Linear Regulator___________________________________________________________________________

MAX1765800mA, Low-Noise, Step-Up DC-DC Converterwith 500mA Linear Regulator6 _________________________________________________________________________

MAX1765800mA, Low-Noise, Step-Up DC-DC Converterwith 500mA Linear Regulator___________________________________________________________________________

MAX1765800mA, Low-Noise, Step-Up DC-DC Converterwith 500mA Linear Regulator8 _________________________________________________________________________

MAX1765800mA, Low-Noise, Step-Up DC-DC Converterwith 500mA Linear Regulator___________________________________________________________________________