CX8508 Ver la hoja de datos (PDF) - Unspecified

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CX8508

Monolithic Synchronous Buck Regulator / 2A Output Current

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OPERATION

FUNCTIONAL DESCRIPTION

The converter uses internal N-Channel MOSFET

switches to step-down the input voltage to the regu-

The CX8508 is a synchronous rectified, current- lated output voltage. Since the high side MOSFET

mode, step-down regulator. It regulates input requires a gate voltage greater than the input voltage,

voltages from 4.75V to 25V down to an output a boost capacitor connected between SW and BS is

voltage as low as 0.925V, and supplies up to 2A needed to drive the high side gate. The boost capaci-

of load current.

tor is charged from the internal 5V rail when SW is

The CX8508 uses current-mode control to low.

regulate the output voltage. The output voltage is When the CX8508 FB pin exceeds 20% of the

measured at FB through a resistive voltage di- nominal regulation voltage of 0.925V, the over volt-

vider and amplified through the internal trans- age comparator is tripped and the COMP pin and the

conductance error amplifier. The voltage at the SS pin are discharged to GND, forcing the high-side

COMP pin is compared to the switch current

switch off.

measured internally to control the output voltage.

150/400KHz

Figure 1 – Functional Block Diagram

4

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