Regulator archives - Page 215 of 501

Part Number: CXW8508

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 ]

Features

1. 3-Terminal Adjustable or Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
2. Output Current of 1.5A, (0.5A for LT1086H)
3. Operates Down to 1V Dropout
4. Guaranteed Dropout Voltage at Multiple Current Levels
5. Line Regulation: 0.015%
6. Load Regulation: 0.1%
7. 100% Thermal Limit Functional Test
8. Ripple Rejection >75dB
9. Available in 3-Pin TO-220 and 3-Pin DD Package

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Description

The LT1086 is designed to provide up to 1.5A output current. All internal circuitry is designed to operate down to 1V input-to-output differential and the dropout voltage is fully specified as a function of load current. Dropout is guaranteed at several operating points up to a maximum of 1.5V at maximum output current. Dropout decreases at lower load currents. On-chip trimming adjusts the reference/ouput voltage to 1%. Current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions. The LT1086 is pin compatible with older 3-terminal adjust able regulators. A minimum 10µF output capacitor is required on these devices. The LT1086 offers excellent line and load regulation specifications and ripple rejection exceeds 75dB even at the maximum load current of 1.5A. The LT1086 is floating architecture with a composite NPN output stage. All of the quiescent current and the drive current for the output stage flows to the load increasing efficiency. The LT1086 is available in a 3-pin TO-220 package and a space-saving surface mountable 3-pin DD package.