Rainbow-electronics MAX8758 Manual do Utilizador Página 1

General DescriptionThe MAX8758 includes a high-performance step-up regu-lator, a high-speed operational amplifier, and a logic-controlled, high-voltag

MAX8758Typical Operating CircuitThe typical operating circuit (Figure 1) of the MAX8758is a power-supply solution for TFT LCD panels in note-book comp

Detailed DescriptionThe MAX8758 is designed primarily for TFT LCD panelsused in notebook computers. It contains a high-perfor-mance step-up regulator,

MAX8758The internal n-channel power MOSFET reduces thenumber of external components. The supply rail of theinternal gate driver is bootstrapped to the

The soft-start timing can be adjusted with an externalcapacitor connected between SS and GND. After thestep-up regulator is enabled, the SS pin is imm

MAX8758Activate the first mode by connecting MODE to LDO.When CTL is logic high, Q1 turns on and Q2 turns off,connecting GON to SRC. When CTL is logic

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCD_____________________________________________________________________

MAX8758In Figure 1’s Typical Operating Circuit, the LCD’s gate-on and gate-off voltages are generated from two unreg-ulated charge pumps driven by the

Step-Up Regulator Input Capacitor SelectionThe input capacitor reduces the current peaks drawnfrom the input supply and reduces noise injection intoth

MAX8758Charge-Pump Flying CapacitorsIncreasing the flying capacitor (C6, C17, C18) valuelowers the effective source impedance and increasesthe output-

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCD_____________________________________________________________________

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCD2 ___________________________________________________________________

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCDMaxim cannot assume responsibility for use of any circuitry other tha

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCD_____________________________________________________________________

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCD4 ___________________________________________________________________

PARAMETER CONDITIONSMINTYPMAXUNITSFREQ = GND 91 99Oscillator Maximum Duty CycleFREQ = IN 88 96%FB Regulation Voltage1.220 1.252VFB Transconductance ∆I

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCD6 ___________________________________________________________________

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCD_____________________________________________________________________

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCD8 ___________________________________________________________________

MAX8758Step-Up Regulator with Switch Control andOperational Amplifier for TFT LCD_____________________________________________________________________