Part Number: CXW8508
Manufacturer: Cheng Xin Wei
Package: SOP 8 Pin Type
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The CX8508 is a monolithic synchronous buck regulator. The device integrates 100mΩ MOSFETS that provide 2A continuous load current over a wide operating input voltage of 4.75V to 25V. Current mode control provides fast transient response and cycle-by-cycle current limit.
An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops below 1 μA. This device, available in an 8-pin SOIC pack age, provides a very compact system solution with minimal reliance on external components.
The CX8508 is a synchronous rectified, curren mode, step-down regulator. It regulates input voltages from 4.75V to 25V down to an output voltage as low as 0.925V, and supplies up to 2A of load current. The CX8508 uses current-mode control tregulate the output voltage. The output voltage is measured at FB through a resistive voltage divider and amplified through the internal trans conductance error amplifier. The voltage at the COMP pin is compared to the switch current measured internally to control the output voltage.
The converter uses internal N-Channel MOSFET switches to step-down the input voltage to the regulated output voltage. Since the high side MOSFET requires a gate voltage greater than the input voltage, a boost capacitor connected between SW and BS is needed to drive the high side gate. The boost capacitor is charged from the internal 5V rail when SW is low.
Features
1. 2A Output Current
2. Wide 4.75V to 25V Operating Input Range
3. Integrated 100mΩPower MOSFET Switches
4. Output Adjustable from 0.925V to 20V
5. Up to 95% Efficiency
6. Programmable Soft-Start
7. Stable with Low ESR Ceramic Output Capacitors
8. Fixed 400KHz Frequency
9. Cycle-by-Cycle Over Current Protection
10. Input Under Voltage Lockout
11. Thermally Enhanced 8-Pin SOIC Package
CXW8508 Datasheet
Datasheet Download : [ CXW8508.PDF ]